Merge branch 'master' of https://github.com/ethereum/go-ethereum

.travis.yml

@@ -13,15 +13,15 @@ matrix:
       go: 1.6.2
     - os: linux
       dist: trusty
-      go: 1.7
+      go: 1.7.4
     - os: osx
-      go: 1.7
+      go: 1.7.4
 
     # This builder does the Ubuntu PPA and Linux Azure uploads
     - os: linux
       dist: trusty
       sudo: required
-      go: 1.7
+      go: 1.7.4
       env:
         - ubuntu-ppa
         - azure-linux
@@ -55,7 +55,7 @@ matrix:
 
     # This builder does the OSX Azure, Android Maven and Azure and iOS CocoaPods and Azure uploads
     - os: osx
-      go: 1.7
+      go: 1.7.4
       env:
         - azure-osx
         - mobile

README.md

@@ -39,9 +39,7 @@ The go-ethereum project comes with several wrappers/executables found in the `cm
 | `evm` | Developer utility version of the EVM (Ethereum Virtual Machine) that is capable of running bytecode snippets within a configurable environment and execution mode. Its purpose is to allow insolated, fine-grained debugging of EVM opcodes (e.g. `evm --code 60ff60ff --debug`). |
 | `gethrpctest` | Developer utility tool to support our [ethereum/rpc-test](https://github.com/ethereum/rpc-tests) test suite which validates baseline conformity to the [Ethereum JSON RPC](https://github.com/ethereum/wiki/wiki/JSON-RPC) specs. Please see the [test suite's readme](https://github.com/ethereum/rpc-tests/blob/master/README.md) for details. |
 | `rlpdump` | Developer utility tool to convert binary RLP ([Recursive Length Prefix](https://github.com/ethereum/wiki/wiki/RLP)) dumps (data encoding used by the Ethereum protocol both network as well as consensus wise) to user friendlier hierarchical representation (e.g. `rlpdump --hex CE0183FFFFFFC4C304050583616263`). |
-| `bzzd`    | swarm daemon. This is the entrypoint for the swarm network. `bzzd --help` for command line options. See https://swarm-guide.readthedocs.io for swarm documentation. |
+| `swarm`    | swarm daemon and tools. This is the entrypoint for the swarm network. `swarm --help` for command line options and subcommands. See https://swarm-guide.readthedocs.io for swarm documentation. |
-| `bzzup`   | swarm command line file uploader. `bzzup --help` for command line options |
-| `bzzhash`   | command to calculate the swarm hash of a file or directory. `bzzhash --help` for command line options |
 
 ## Running geth
 

VERSION

@@ -1 +1 @@
-1.5.5
+1.5.6

accounts/abi/type.go

@@ -33,7 +33,7 @@ const (
 	FixedBytesTy
 	BytesTy
 	HashTy
-	RealTy
+	FixedpointTy
 )
 
 // Type is the reflection of the supported argument type
@@ -57,16 +57,16 @@ var (
 	// Types can be in the format of:
 	//
 	// 	Input  = Type [ "[" [ Number ] "]" ] Name .
-	// 	Type   = [ "u" ] "int" [ Number ] .
+	// 	Type   = [ "u" ] "int" [ Number ] [ x ] [ Number ].
 	//
 	// Examples:
 	//
-	//      string     int       uint       real
+	//      string     int       uint       fixed
 	//      string32   int8      uint8      uint[]
-	//      address    int256    uint256    real[2]
+	//      address    int256    uint256    fixed128x128[2]
-	fullTypeRegex = regexp.MustCompile("([a-zA-Z0-9]+)(\\[([0-9]*)?\\])?")
+	fullTypeRegex = regexp.MustCompile("([a-zA-Z0-9]+)(\\[([0-9]*)\\])?")
 	// typeRegex parses the abi sub types
-	typeRegex = regexp.MustCompile("([a-zA-Z]+)([0-9]*)?")
+	typeRegex = regexp.MustCompile("([a-zA-Z]+)(([0-9]+)(x([0-9]+))?)?")
 )
 
 // NewType creates a new reflection type of abi type given in t.
@@ -97,7 +97,7 @@ func NewType(t string) (typ Type, err error) {
 	parsedType := typeRegex.FindAllStringSubmatch(res[1], -1)[0]
 	// varSize is the size of the variable
 	var varSize int
-	if len(parsedType[2]) > 0 {
+	if len(parsedType[3]) > 0 {
 		var err error
 		varSize, err = strconv.Atoi(parsedType[2])
 		if err != nil {

accounts/abi/type_test.go

@@ -0,0 +1,78 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package abi
+
+import (
+	"reflect"
+	"testing"
+)
+
+// typeWithoutStringer is a alias for the Type type which simply doesn't implement
+// the stringer interface to allow printing type details in the tests below.
+type typeWithoutStringer Type
+
+// Tests that all allowed types get recognized by the type parser.
+func TestTypeRegexp(t *testing.T) {
+	tests := []struct {
+		blob string
+		kind Type
+	}{
+		{"int", Type{Kind: reflect.Ptr, Type: big_t, Size: 256, T: IntTy, stringKind: "int256"}},
+		{"int8", Type{Kind: reflect.Int8, Type: big_t, Size: 8, T: IntTy, stringKind: "int8"}},
+		{"int256", Type{Kind: reflect.Ptr, Type: big_t, Size: 256, T: IntTy, stringKind: "int256"}},
+		{"int[]", Type{IsSlice: true, SliceSize: -1, Elem: &Type{Kind: reflect.Ptr, Type: big_t, Size: 256, T: IntTy, stringKind: "int256"}, stringKind: "int256[]"}},
+		{"int[2]", Type{IsArray: true, SliceSize: 2, Elem: &Type{Kind: reflect.Ptr, Type: big_t, Size: 256, T: IntTy, stringKind: "int256"}, stringKind: "int256[2]"}},
+		{"int32[]", Type{IsSlice: true, SliceSize: -1, Elem: &Type{Kind: reflect.Int32, Type: big_t, Size: 32, T: IntTy, stringKind: "int32"}, stringKind: "int32[]"}},
+		{"int32[2]", Type{IsArray: true, SliceSize: 2, Elem: &Type{Kind: reflect.Int32, Type: big_t, Size: 32, T: IntTy, stringKind: "int32"}, stringKind: "int32[2]"}},
+		{"uint", Type{Kind: reflect.Ptr, Type: ubig_t, Size: 256, T: UintTy, stringKind: "uint256"}},
+		{"uint8", Type{Kind: reflect.Uint8, Type: ubig_t, Size: 8, T: UintTy, stringKind: "uint8"}},
+		{"uint256", Type{Kind: reflect.Ptr, Type: ubig_t, Size: 256, T: UintTy, stringKind: "uint256"}},
+		{"uint[]", Type{IsSlice: true, SliceSize: -1, Elem: &Type{Kind: reflect.Ptr, Type: ubig_t, Size: 256, T: UintTy, stringKind: "uint256"}, stringKind: "uint256[]"}},
+		{"uint[2]", Type{IsArray: true, SliceSize: 2, Elem: &Type{Kind: reflect.Ptr, Type: ubig_t, Size: 256, T: UintTy, stringKind: "uint256"}, stringKind: "uint256[2]"}},
+		{"uint32[]", Type{IsSlice: true, SliceSize: -1, Elem: &Type{Kind: reflect.Uint32, Type: big_t, Size: 32, T: UintTy, stringKind: "uint32"}, stringKind: "uint32[]"}},
+		{"uint32[2]", Type{IsArray: true, SliceSize: 2, Elem: &Type{Kind: reflect.Uint32, Type: big_t, Size: 32, T: UintTy, stringKind: "uint32"}, stringKind: "uint32[2]"}},
+		{"bytes", Type{IsSlice: true, SliceSize: -1, Elem: &Type{Kind: reflect.Uint8, Type: ubig_t, Size: 8, T: UintTy, stringKind: "uint8"}, T: BytesTy, stringKind: "bytes"}},
+		{"bytes32", Type{IsArray: true, SliceSize: 32, Elem: &Type{Kind: reflect.Uint8, Type: ubig_t, Size: 8, T: UintTy, stringKind: "uint8"}, T: FixedBytesTy, stringKind: "bytes32"}},
+		{"bytes[]", Type{IsSlice: true, SliceSize: -1, Elem: &Type{IsSlice: true, SliceSize: -1, Elem: &Type{Kind: reflect.Uint8, Type: ubig_t, Size: 8, T: UintTy, stringKind: "uint8"}, T: BytesTy, stringKind: "bytes"}, stringKind: "bytes[]"}},
+		{"bytes[2]", Type{IsArray: true, SliceSize: 2, Elem: &Type{IsSlice: true, SliceSize: -1, Elem: &Type{Kind: reflect.Uint8, Type: ubig_t, Size: 8, T: UintTy, stringKind: "uint8"}, T: BytesTy, stringKind: "bytes"}, stringKind: "bytes[2]"}},
+		{"bytes32[]", Type{IsSlice: true, SliceSize: -1, Elem: &Type{IsArray: true, SliceSize: 32, Elem: &Type{Kind: reflect.Uint8, Type: ubig_t, Size: 8, T: UintTy, stringKind: "uint8"}, T: FixedBytesTy, stringKind: "bytes32"}, stringKind: "bytes32[]"}},
+		{"bytes32[2]", Type{IsArray: true, SliceSize: 2, Elem: &Type{IsArray: true, SliceSize: 32, Elem: &Type{Kind: reflect.Uint8, Type: ubig_t, Size: 8, T: UintTy, stringKind: "uint8"}, T: FixedBytesTy, stringKind: "bytes32"}, stringKind: "bytes32[2]"}},
+		{"string", Type{Kind: reflect.String, Size: -1, T: StringTy, stringKind: "string"}},
+		{"string[]", Type{IsSlice: true, SliceSize: -1, Elem: &Type{Kind: reflect.String, Size: -1, T: StringTy, stringKind: "string"}, stringKind: "string[]"}},
+		{"string[2]", Type{IsArray: true, SliceSize: 2, Elem: &Type{Kind: reflect.String, Size: -1, T: StringTy, stringKind: "string"}, stringKind: "string[2]"}},
+		{"address", Type{Kind: reflect.Array, Type: address_t, Size: 20, T: AddressTy, stringKind: "address"}},
+		{"address[]", Type{IsSlice: true, SliceSize: -1, Elem: &Type{Kind: reflect.Array, Type: address_t, Size: 20, T: AddressTy, stringKind: "address"}, stringKind: "address[]"}},
+		{"address[2]", Type{IsArray: true, SliceSize: 2, Elem: &Type{Kind: reflect.Array, Type: address_t, Size: 20, T: AddressTy, stringKind: "address"}, stringKind: "address[2]"}},
+
+		// TODO when fixed types are implemented properly
+		// {"fixed", Type{}},
+		// {"fixed128x128", Type{}},
+		// {"fixed[]", Type{}},
+		// {"fixed[2]", Type{}},
+		// {"fixed128x128[]", Type{}},
+		// {"fixed128x128[2]", Type{}},
+	}
+	for i, tt := range tests {
+		typ, err := NewType(tt.blob)
+		if err != nil {
+			t.Errorf("type %d: failed to parse type string: %v", i, err)
+		}
+		if !reflect.DeepEqual(typ, tt.kind) {
+			t.Errorf("type %d: parsed type mismatch:\n  have %+v\n  want %+v", i, typeWithoutStringer(typ), typeWithoutStringer(tt.kind))
+		}
+	}
+}

appveyor.yml

@@ -22,8 +22,8 @@ environment:
 
 install:
   - rmdir C:\go /s /q
-  - appveyor DownloadFile https://storage.googleapis.com/golang/go1.7.3.windows-%GETH_ARCH%.zip
+  - appveyor DownloadFile https://storage.googleapis.com/golang/go1.7.4.windows-%GETH_ARCH%.zip
-  - 7z x go1.7.3.windows-%GETH_ARCH%.zip -y -oC:\ > NUL
+  - 7z x go1.7.4.windows-%GETH_ARCH%.zip -y -oC:\ > NUL
   - go version
   - gcc --version
 

build/ci.go

@@ -72,9 +72,7 @@ var (
 		executablePath("abigen"),
 		executablePath("evm"),
 		executablePath("geth"),
-		executablePath("bzzd"),
+		executablePath("swarm"),
-		executablePath("bzzhash"),
-		executablePath("bzzup"),
 		executablePath("rlpdump"),
 	}
 
@@ -93,16 +91,8 @@ var (
 			Description: "Developer utility version of the EVM (Ethereum Virtual Machine) that is capable of running bytecode snippets within a configurable environment and execution mode.",
 		},
 		{
-			Name:        "bzzd",
+			Name:        "swarm",
-			Description: "Ethereum Swarm daemon",
+			Description: "Ethereum Swarm daemon and tools",
-		},
-		{
-			Name:        "bzzup",
-			Description: "Ethereum Swarm command line file/directory uploader",
-		},
-		{
-			Name:        "bzzhash",
-			Description: "Ethereum Swarm file/directory hash calculator",
 		},
 		{
 			Name:        "abigen",
@@ -112,7 +102,8 @@ var (
 
 	// Distros for which packages are created.
 	// Note: vivid is unsupported because there is no golang-1.6 package for it.
-	debDistros = []string{"trusty", "wily", "xenial", "yakkety"}
+	// Note: wily is unsupported because it was officially deprecated on lanchpad.
+	debDistros = []string{"trusty", "xenial", "yakkety"}
 )
 
 var GOBIN, _ = filepath.Abs(filepath.Join("build", "bin"))
@@ -638,6 +629,7 @@ func doWindowsInstaller(cmdline []string) {
 	build.Render("build/nsis.geth.nsi", filepath.Join(*workdir, "geth.nsi"), 0644, nil)
 	build.Render("build/nsis.install.nsh", filepath.Join(*workdir, "install.nsh"), 0644, templateData)
 	build.Render("build/nsis.uninstall.nsh", filepath.Join(*workdir, "uninstall.nsh"), 0644, allTools)
+	build.Render("build/nsis.pathupdate.nsh", filepath.Join(*workdir, "PathUpdate.nsh"), 0644, nil)
 	build.Render("build/nsis.envvarupdate.nsh", filepath.Join(*workdir, "EnvVarUpdate.nsh"), 0644, nil)
 	build.CopyFile(filepath.Join(*workdir, "SimpleFC.dll"), "build/nsis.simplefc.dll", 0755)
 	build.CopyFile(filepath.Join(*workdir, "COPYING"), "COPYING", 0755)

build/nsis.geth.nsi

@@ -17,8 +17,12 @@
 #
 # Requirements:
 # - NSIS, http://nsis.sourceforge.net/Main_Page
+# - NSIS Large Strings build, http://nsis.sourceforge.net/Special_Builds
 # - SFP, http://nsis.sourceforge.net/NSIS_Simple_Firewall_Plugin (put dll in NSIS\Plugins\x86-ansi)
 #
+# After intalling NSIS extra the NSIS Large Strings build zip and replace the makensis.exe and the
+# files found in Stub.
+#
 # based on: http://nsis.sourceforge.net/A_simple_installer_with_start_menu_shortcut_and_uninstaller
 #
 # TODO:
@@ -37,6 +41,7 @@ RequestExecutionLevel admin
 SetCompressor /SOLID lzma
 
 !include LogicLib.nsh
+!include PathUpdate.nsh
 !include EnvVarUpdate.nsh
 
 !macro VerifyUserIsAdmin

build/nsis.install.nsh

@@ -37,8 +37,9 @@ Section "Geth" GETH_IDX
   ${EnvVarUpdate} $0 "ETHEREUM_SOCKET" "R" "HKLM" "\\.\pipe\geth.ipc"
   ${EnvVarUpdate} $0 "ETHEREUM_SOCKET" "A" "HKLM" "\\.\pipe\geth.ipc"
 
-  # Add geth to PATH
+  # Add instdir to PATH
-  ${EnvVarUpdate} $0 "PATH" "A" "HKLM" $INSTDIR
+  Push "$INSTDIR"
+  Call AddToPath
 SectionEnd
 
 # Install optional develop tools.

build/nsis.pathupdate.nsh

@@ -0,0 +1,153 @@
+!include "WinMessages.nsh"
+
+; see https://support.microsoft.com/en-us/kb/104011
+!define Environ 'HKLM "SYSTEM\CurrentControlSet\Control\Session Manager\Environment"'
+; HKEY_LOCAL_MACHINE = 0x80000002
+
+; AddToPath - Appends dir to PATH
+;   (does not work on Win9x/ME)
+;
+; Usage:
+;   Push "dir"
+;   Call AddToPath
+Function AddToPath
+  Exch $0
+  Push $1
+  Push $2
+  Push $3
+  Push $4
+
+  ; NSIS ReadRegStr returns empty string on string overflow
+  ; Native calls are used here to check actual length of PATH
+  ; $4 = RegOpenKey(HKEY_LOCAL_MACHINE, "SYSTEM\CurrentControlSet\Control\Session Manager\Environment", &$3)
+  System::Call "advapi32::RegOpenKey(i 0x80000002, t'SYSTEM\CurrentControlSet\Control\Session Manager\Environment', *i.r3) i.r4"
+  IntCmp $4 0 0 done done
+
+  ; $4 = RegQueryValueEx($3, "PATH", (DWORD*)0, (DWORD*)0, &$1, ($2=NSIS_MAX_STRLEN, &$2))
+  ; RegCloseKey($3)
+  System::Call "advapi32::RegQueryValueEx(i $3, t'PATH', i 0, i 0, t.r1, *i ${NSIS_MAX_STRLEN} r2) i.r4"
+  System::Call "advapi32::RegCloseKey(i $3)"
+
+  IntCmp $4 234 0 +4 +4 ; $4 == ERROR_MORE_DATA
+    DetailPrint "AddToPath: original length $2 > ${NSIS_MAX_STRLEN}"
+    MessageBox MB_OK "PATH not updated, original length $2 > ${NSIS_MAX_STRLEN}"
+    Goto done
+
+  IntCmp $4 0 +5 ; $4 != NO_ERROR
+    IntCmp $4 2 +3 ; $4 != ERROR_FILE_NOT_FOUND
+      DetailPrint "AddToPath: unexpected error code $4"
+      Goto done
+    StrCpy $1 ""
+
+  ; Check if already in PATH
+  Push "$1;"
+  Push "$0;"
+  Call StrStr
+  Pop $2
+  StrCmp $2 "" 0 done
+  Push "$1;"
+  Push "$0\;"
+  Call StrStr
+  Pop $2
+  StrCmp $2 "" 0 done
+
+  ; Prevent NSIS string overflow
+  StrLen $2 $0
+  StrLen $3 $1
+  IntOp $2 $2 + $3
+  IntOp $2 $2 + 2 ; $2 = strlen(dir) + strlen(PATH) + sizeof(";")
+  IntCmp $2 ${NSIS_MAX_STRLEN} +4 +4 0
+    DetailPrint "AddToPath: new length $2 > ${NSIS_MAX_STRLEN}"
+    MessageBox MB_OK "PATH not updated, new length $2 > ${NSIS_MAX_STRLEN}."
+    Goto done
+
+  ; Append dir to PATH
+  DetailPrint "Add to PATH: $0"
+  StrCpy $2 $1 1 -1
+  StrCmp $2 ";" 0 +2
+    StrCpy $1 $1 -1 ; remove trailing ';'
+  StrCmp $1 "" +2   ; no leading ';'
+    StrCpy $0 "$1;$0"
+  
+  WriteRegExpandStr ${Environ} "PATH" $0
+  SendMessage ${HWND_BROADCAST} ${WM_WININICHANGE} 0 "STR:Environment" /TIMEOUT=5000
+
+done:
+  Pop $4
+  Pop $3
+  Pop $2
+  Pop $1
+  Pop $0
+FunctionEnd
+
+
+; RemoveFromPath - Removes dir from PATH
+;
+; Usage:
+;   Push "dir"
+;   Call RemoveFromPath
+Function un.RemoveFromPath
+  Exch $0
+  Push $1
+  Push $2
+  Push $3
+  Push $4
+  Push $5
+  Push $6
+
+  ; NSIS ReadRegStr returns empty string on string overflow
+  ; Native calls are used here to check actual length of PATH
+  ; $4 = RegOpenKey(HKEY_LOCAL_MACHINE, "SYSTEM\CurrentControlSet\Control\Session Manager\Environment", &$3)
+  System::Call "advapi32::RegOpenKey(i 0x80000002, t'SYSTEM\CurrentControlSet\Control\Session Manager\Environment', *i.r3) i.r4"
+  IntCmp $4 0 0 done done
+
+  ; $4 = RegQueryValueEx($3, "PATH", (DWORD*)0, (DWORD*)0, &$1, ($2=NSIS_MAX_STRLEN, &$2))
+  ; RegCloseKey($3)
+  System::Call "advapi32::RegQueryValueEx(i $3, t'PATH', i 0, i 0, t.r1, *i ${NSIS_MAX_STRLEN} r2) i.r4"
+  System::Call "advapi32::RegCloseKey(i $3)"
+
+  IntCmp $4 234 0 +4 +4 ; $4 == ERROR_MORE_DATA
+    DetailPrint "RemoveFromPath: original length $2 > ${NSIS_MAX_STRLEN}"
+    MessageBox MB_OK "PATH not updated, original length $2 > ${NSIS_MAX_STRLEN}"
+    Goto done
+
+  IntCmp $4 0 +5 ; $4 != NO_ERROR
+    IntCmp $4 2 +3 ; $4 != ERROR_FILE_NOT_FOUND
+      DetailPrint "RemoveFromPath: unexpected error code $4"
+      Goto done
+    StrCpy $1 ""
+
+  ; length < ${NSIS_MAX_STRLEN} -> ReadRegStr can be used
+  ReadRegStr $1 ${Environ} "PATH"
+  StrCpy $5 $1 1 -1
+  StrCmp $5 ";" +2
+  StrCpy $1 "$1;" ; ensure trailing ';'
+  Push $1
+  Push "$0;"
+  Call un.StrStr
+  Pop $2 ; pos of our dir
+  StrCmp $2 "" done
+
+  DetailPrint "Remove from PATH: $0"
+  StrLen $3 "$0;"
+  StrLen $4 $2
+  StrCpy $5 $1 -$4 ; $5 is now the part before the path to remove
+  StrCpy $6 $2 "" $3 ; $6 is now the part after the path to remove
+  StrCpy $3 "$5$6"
+  StrCpy $5 $3 1 -1
+  StrCmp $5 ";" 0 +2
+    StrCpy $3 $3 -1 ; remove trailing ';'
+  WriteRegExpandStr ${Environ} "PATH" $3
+  SendMessage ${HWND_BROADCAST} ${WM_WININICHANGE} 0 "STR:Environment" /TIMEOUT=5000
+
+done:
+  Pop $6
+  Pop $5
+  Pop $4
+  Pop $3
+  Pop $2
+  Pop $1
+  Pop $0
+FunctionEnd
+ 
+

build/nsis.uninstall.nsh

@@ -25,7 +25,8 @@ Section "Uninstall"
   ${un.EnvVarUpdate} $0 "ETHEREUM_SOCKET" "R" "HKLM" "\\.\pipe\geth.ipc"
 
   # Remove install directory from PATH
-  ${un.EnvVarUpdate} $0 "PATH" "R" "HKLM" $INSTDIR
+  Push "$INSTDIR"
+  Call un.RemoveFromPath
 
   # Cleanup registry (deletes all sub keys)
   DeleteRegKey HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\${GROUPNAME} ${APPNAME}"

cmd/geth/library.c

@@ -1,24 +0,0 @@
-// Copyright 2015 The go-ethereum Authors
-// This file is part of go-ethereum.
-//
-// go-ethereum is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// go-ethereum is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
-
-// Simple wrapper to translate the API exposed methods and types to inthernal
-// Go versions of the same types.
-
-#include "_cgo_export.h"
-
-int run(const char* args) {
- return doRun((char*)args);
-}

cmd/geth/library.go

@@ -1,46 +0,0 @@
-// Copyright 2015 The go-ethereum Authors
-// This file is part of go-ethereum.
-//
-// go-ethereum is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// go-ethereum is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
-
-// Contains a simple library definition to allow creating a Geth instance from
-// straight C code.
-
-package main
-
-// #ifdef __cplusplus
-// extern "C" {
-// #endif
-//
-// extern int run(const char*);
-//
-// #ifdef __cplusplus
-// }
-// #endif
-import "C"
-import (
-	"fmt"
-	"os"
-	"strings"
-)
-
-//export doRun
-func doRun(args *C.char) C.int {
-	// This is equivalent to geth.main, just modified to handle the function arg passing
-	if err := app.Run(strings.Split("geth "+C.GoString(args), " ")); err != nil {
-		fmt.Fprintln(os.Stderr, err)
-		return -1
-	}
-	return 0
-}

cmd/geth/library_android.go

@@ -1,56 +0,0 @@
-// Copyright 2015 The go-ethereum Authors
-// This file is part of go-ethereum.
-//
-// go-ethereum is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// go-ethereum is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
-
-// Contains specialized code for running Geth on Android.
-
-package main
-
-// #include <android/log.h>
-// #cgo LDFLAGS: -llog
-import "C"
-import (
-	"bufio"
-	"os"
-)
-
-func init() {
-	// Redirect the standard output and error to logcat
-	oldStdout, oldStderr := os.Stdout, os.Stderr
-
-	outRead, outWrite, _ := os.Pipe()
-	errRead, errWrite, _ := os.Pipe()
-
-	os.Stdout = outWrite
-	os.Stderr = errWrite
-
-	go func() {
-		scanner := bufio.NewScanner(outRead)
-		for scanner.Scan() {
-			line := scanner.Text()
-			C.__android_log_write(C.ANDROID_LOG_INFO, C.CString("Stdout"), C.CString(line))
-			oldStdout.WriteString(line + "\n")
-		}
-	}()
-
-	go func() {
-		scanner := bufio.NewScanner(errRead)
-		for scanner.Scan() {
-			line := scanner.Text()
-			C.__android_log_write(C.ANDROID_LOG_INFO, C.CString("Stderr"), C.CString(line))
-			oldStderr.WriteString(line + "\n")
-		}
-	}()
-}

cmd/swarm/hash.go

@@ -19,22 +19,21 @@ package main
 
 import (
 	"fmt"
+	"log"
 	"os"
-	"runtime"
 
 	"github.com/ethereum/go-ethereum/swarm/storage"
+	"gopkg.in/urfave/cli.v1"
 )
 
-func main() {
+func hash(ctx *cli.Context) {
-	runtime.GOMAXPROCS(runtime.NumCPU())
+	args := ctx.Args()
-
+	if len(args) < 1 {
-	if len(os.Args) < 2 {
+		log.Fatal("Usage: swarm hash <file name>")
-		fmt.Println("Usage: bzzhash <file name>")
-		os.Exit(0)
 	}
-	f, err := os.Open(os.Args[1])
+	f, err := os.Open(args[0])
 	if err != nil {
-		fmt.Println("Error opening file " + os.Args[1])
+		fmt.Println("Error opening file " + args[1])
 		os.Exit(1)
 	}
 
@@ -42,7 +41,7 @@ func main() {
 	chunker := storage.NewTreeChunker(storage.NewChunkerParams())
 	key, err := chunker.Split(f, stat.Size(), nil, nil, nil)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "%v\n", err)
+		log.Fatalf("%v\n", err)
 	} else {
 		fmt.Printf("%v\n", key)
 	}

cmd/swarm/main.go

@@ -43,11 +43,21 @@ import (
 	"gopkg.in/urfave/cli.v1"
 )
 
-const clientIdentifier = "bzzd"
+const (
+	clientIdentifier = "swarm"
+	versionString    = "0.2"
+)
 
 var (
-	gitCommit string // Git SHA1 commit hash of the release (set via linker flags)
+	gitCommit        string // Git SHA1 commit hash of the release (set via linker flags)
-	app       = utils.NewApp(gitCommit, "Ethereum Swarm server daemon")
+	app              = utils.NewApp(gitCommit, "Ethereum Swarm")
+	testbetBootNodes = []string{
+		"enode://ec8ae764f7cb0417bdfb009b9d0f18ab3818a3a4e8e7c67dd5f18971a93510a2e6f43cd0b69a27e439a9629457ea804104f37c85e41eed057d3faabbf7744cdf@13.74.157.139:30429",
+		"enode://c2e1fceb3bf3be19dff71eec6cccf19f2dbf7567ee017d130240c670be8594bc9163353ca55dd8df7a4f161dd94b36d0615c17418b5a3cdcbb4e9d99dfa4de37@13.74.157.139:30430",
+		"enode://fe29b82319b734ce1ec68b84657d57145fee237387e63273989d354486731e59f78858e452ef800a020559da22dcca759536e6aa5517c53930d29ce0b1029286@13.74.157.139:30431",
+		"enode://1d7187e7bde45cf0bee489ce9852dd6d1a0d9aa67a33a6b8e6db8a4fbc6fcfa6f0f1a5419343671521b863b187d1c73bad3603bae66421d157ffef357669ddb8@13.74.157.139:30432",
+		"enode://0e4cba800f7b1ee73673afa6a4acead4018f0149d2e3216be3f133318fd165b324cd71b81fbe1e80deac8dbf56e57a49db7be67f8b9bc81bd2b7ee496434fb5d@13.74.157.139:30433",
+	}
 )
 
 var (
@@ -65,7 +75,7 @@ var (
 	}
 	SwarmNetworkIdFlag = cli.IntFlag{
 		Name:  "bzznetworkid",
-		Usage: "Network identifier (integer, default 322=swarm testnet)",
+		Usage: "Network identifier (integer, default 3=swarm testnet)",
 		Value: network.NetworkId,
 	}
 	SwarmConfigPathFlag = cli.StringFlag{
@@ -85,10 +95,25 @@ var (
 		Usage: "URL of the Ethereum API provider",
 		Value: node.DefaultIPCEndpoint("geth"),
 	}
+	SwarmApiFlag = cli.StringFlag{
+		Name:  "bzzapi",
+		Usage: "Swarm HTTP endpoint",
+		Value: "http://127.0.0.1:8500",
+	}
+	SwarmRecursiveUploadFlag = cli.BoolFlag{
+		Name:  "recursive",
+		Usage: "Upload directories recursively",
+	}
+	SwarmWantManifestFlag = cli.BoolTFlag{
+		Name:  "manifest",
+		Usage: "Automatic manifest upload",
+	}
+	SwarmUploadDefaultPath = cli.StringFlag{
+		Name:  "defaultpath",
+		Usage: "path to file served for empty url path (none)",
+	}
 )
 
-var defaultBootnodes = []string{}
-
 func init() {
 	// Override flag defaults so bzzd can run alongside geth.
 	utils.ListenPortFlag.Value = 30399
@@ -96,8 +121,39 @@ func init() {
 	utils.IPCApiFlag.Value = "admin, bzz, chequebook, debug, rpc, web3"
 
 	// Set up the cli app.
-	app.Commands = nil
 	app.Action = bzzd
+	app.HideVersion = true // we have a command to print the version
+	app.Copyright = "Copyright 2013-2016 The go-ethereum Authors"
+	app.Commands = []cli.Command{
+		cli.Command{
+			Action:    version,
+			Name:      "version",
+			Usage:     "Print version numbers",
+			ArgsUsage: " ",
+			Description: `
+The output of this command is supposed to be machine-readable.
+`,
+		},
+		cli.Command{
+			Action:    upload,
+			Name:      "up",
+			Usage:     "upload a file or directory to swarm using the HTTP API",
+			ArgsUsage: " <file>",
+			Description: `
+"upload a file or directory to swarm using the HTTP API and prints the root hash",
+`,
+		},
+		cli.Command{
+			Action:    hash,
+			Name:      "hash",
+			Usage:     "print the swarm hash of a file or directory",
+			ArgsUsage: " <file>",
+			Description: `
+Prints the swarm hash of file or directory.
+`,
+		},
+	}
+
 	app.Flags = []cli.Flag{
 		utils.IdentityFlag,
 		utils.DataDirFlag,
@@ -123,6 +179,11 @@ func init() {
 		SwarmAccountFlag,
 		SwarmNetworkIdFlag,
 		ChequebookAddrFlag,
+		// upload flags
+		SwarmApiFlag,
+		SwarmRecursiveUploadFlag,
+		SwarmWantManifestFlag,
+		SwarmUploadDefaultPath,
 	}
 	app.Flags = append(app.Flags, debug.Flags...)
 	app.Before = func(ctx *cli.Context) error {
@@ -142,17 +203,33 @@ func main() {
 	}
 }
 
+func version(ctx *cli.Context) error {
+	fmt.Println(strings.Title(clientIdentifier))
+	fmt.Println("Version:", versionString)
+	if gitCommit != "" {
+		fmt.Println("Git Commit:", gitCommit)
+	}
+	fmt.Println("Network Id:", ctx.GlobalInt(utils.NetworkIdFlag.Name))
+	fmt.Println("Go Version:", runtime.Version())
+	fmt.Println("OS:", runtime.GOOS)
+	fmt.Printf("GOPATH=%s\n", os.Getenv("GOPATH"))
+	fmt.Printf("GOROOT=%s\n", runtime.GOROOT())
+	return nil
+}
+
 func bzzd(ctx *cli.Context) error {
 	stack := utils.MakeNode(ctx, clientIdentifier, gitCommit)
 	registerBzzService(ctx, stack)
 	utils.StartNode(stack)
-
+	networkId := ctx.GlobalUint64(SwarmNetworkIdFlag.Name)
 	// Add bootnodes as initial peers.
 	if ctx.GlobalIsSet(utils.BootnodesFlag.Name) {
 		bootnodes := strings.Split(ctx.GlobalString(utils.BootnodesFlag.Name), ",")
 		injectBootnodes(stack.Server(), bootnodes)
 	} else {
-		injectBootnodes(stack.Server(), defaultBootnodes)
+		if networkId == 3 {
+			injectBootnodes(stack.Server(), testbetBootNodes)
+		}
 	}
 
 	stack.Wait()
@@ -182,13 +259,11 @@ func registerBzzService(ctx *cli.Context, stack *node.Node) {
 
 	boot := func(ctx *node.ServiceContext) (node.Service, error) {
 		var client *ethclient.Client
-		if ethapi == "" {
+		if len(ethapi) > 0 {
-			err = fmt.Errorf("use ethapi flag to connect to a an eth client and talk to the blockchain")
-		} else {
 			client, err = ethclient.Dial(ethapi)
-		}
+			if err != nil {
-		if err != nil {
+				utils.Fatalf("Can't connect: %v", err)
-			utils.Fatalf("Can't connect: %v", err)
+			}
 		}
 		return swarm.NewSwarm(ctx, client, bzzconfig, swapEnabled, syncEnabled)
 	}

cmd/swarm/upload.go

@@ -20,7 +20,6 @@ package main
 import (
 	"bytes"
 	"encoding/json"
-	"flag"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -28,58 +27,83 @@ import (
 	"mime"
 	"net/http"
 	"os"
+	"os/user"
+	"path"
 	"path/filepath"
 	"strings"
+
+	"gopkg.in/urfave/cli.v1"
 )
 
-func main() {
+func upload(ctx *cli.Context) {
+	args := ctx.Args()
 	var (
-		bzzapiFlag    = flag.String("bzzapi", "http://127.0.0.1:8500", "Swarm HTTP endpoint")
+		bzzapi       = strings.TrimRight(ctx.GlobalString(SwarmApiFlag.Name), "/")
-		recursiveFlag = flag.Bool("recursive", false, "Upload directories recursively")
+		recursive    = ctx.GlobalBool(SwarmRecursiveUploadFlag.Name)
-		manifestFlag  = flag.Bool("manifest", true, "Skip automatic manifest upload")
+		wantManifest = ctx.GlobalBoolT(SwarmWantManifestFlag.Name)
+		defaultPath  = ctx.GlobalString(SwarmUploadDefaultPath.Name)
 	)
-	log.SetOutput(os.Stderr)
+	if len(args) != 1 {
-	log.SetFlags(0)
-	flag.Parse()
-	if flag.NArg() != 1 {
 		log.Fatal("need filename as the first and only argument")
 	}
 
 	var (
-		file   = flag.Arg(0)
+		file   = args[0]
-		client = &client{api: strings.TrimSuffix(*bzzapiFlag, "/")}
+		client = &client{api: bzzapi}
 		mroot  manifest
+		entry  manifestEntry
 	)
-	fi, err := os.Stat(file)
+	fi, err := os.Stat(expandPath(file))
 	if err != nil {
 		log.Fatal(err)
 	}
 	if fi.IsDir() {
-		if !*recursiveFlag {
+		if !recursive {
 			log.Fatal("argument is a directory and recursive upload is disabled")
 		}
-		mroot, err = client.uploadDirectory(file)
+		mroot, err = client.uploadDirectory(file, defaultPath)
 	} else {
-		mroot, err = client.uploadFile(file, fi)
+		entry, err = client.uploadFile(file, fi)
-		if *manifestFlag {
+		mroot = manifest{[]manifestEntry{entry}}
-			// Wrap the raw file entry in a proper manifest so both hashes get printed.
-			mroot = manifest{Entries: []manifest{mroot}}
-		}
 	}
 	if err != nil {
 		log.Fatalln("upload failed:", err)
 	}
-	if *manifestFlag {
+	if !wantManifest {
-		hash, err := client.uploadManifest(mroot)
+		// Print the manifest. This is the only output to stdout.
-		if err != nil {
+		mrootJSON, _ := json.MarshalIndent(mroot, "", "  ")
-			log.Fatalln("manifest upload failed:", err)
+		fmt.Println(string(mrootJSON))
-		}
+		return
-		mroot.Hash = hash
 	}
+	hash, err := client.uploadManifest(mroot)
+	if err != nil {
+		log.Fatalln("manifest upload failed:", err)
+	}
+	fmt.Println(hash)
+}
 
-	// Print the manifest. This is the only output to stdout.
+// Expands a file path
-	mrootJSON, _ := json.MarshalIndent(mroot, "", "  ")
+// 1. replace tilde with users home dir
-	fmt.Println(string(mrootJSON))
+// 2. expands embedded environment variables
+// 3. cleans the path, e.g. /a/b/../c -> /a/c
+// Note, it has limitations, e.g. ~someuser/tmp will not be expanded
+func expandPath(p string) string {
+	if strings.HasPrefix(p, "~/") || strings.HasPrefix(p, "~\\") {
+		if home := homeDir(); home != "" {
+			p = home + p[1:]
+		}
+	}
+	return path.Clean(os.ExpandEnv(p))
+}
+
+func homeDir() string {
+	if home := os.Getenv("HOME"); home != "" {
+		return home
+	}
+	if usr, err := user.Current(); err == nil {
+		return usr.HomeDir
+	}
+	return ""
 }
 
 // client wraps interaction with the swarm HTTP gateway.
@@ -88,24 +112,40 @@ type client struct {
 }
 
 // manifest is the JSON representation of a swarm manifest.
-type manifest struct {
+type manifestEntry struct {
-	Hash        string     `json:"hash,omitempty"`
+	Hash        string `json:"hash,omitempty"`
-	ContentType string     `json:"contentType,omitempty"`
+	ContentType string `json:"contentType,omitempty"`
-	Path        string     `json:"path,omitempty"`
+	Path        string `json:"path,omitempty"`
-	Entries     []manifest `json:"entries,omitempty"`
 }
 
-func (c *client) uploadFile(file string, fi os.FileInfo) (manifest, error) {
+// manifest is the JSON representation of a swarm manifest.
+type manifest struct {
+	Entries []manifestEntry `json:"entries,omitempty"`
+}
+
+func (c *client) uploadFile(file string, fi os.FileInfo) (manifestEntry, error) {
 	hash, err := c.uploadFileContent(file, fi)
-	m := manifest{
+	m := manifestEntry{
 		Hash:        hash,
 		ContentType: mime.TypeByExtension(filepath.Ext(fi.Name())),
 	}
 	return m, err
 }
 
-func (c *client) uploadDirectory(dir string) (manifest, error) {
+func (c *client) uploadDirectory(dir string, defaultPath string) (manifest, error) {
 	dirm := manifest{}
+	if len(defaultPath) > 0 {
+		fi, err := os.Stat(defaultPath)
+		if err != nil {
+			log.Fatal(err)
+		}
+		entry, err := c.uploadFile(defaultPath, fi)
+		if err != nil {
+			log.Fatal(err)
+		}
+		entry.Path = ""
+		dirm.Entries = append(dirm.Entries, entry)
+	}
 	prefix := filepath.ToSlash(filepath.Clean(dir)) + "/"
 	err := filepath.Walk(dir, func(path string, fi os.FileInfo, err error) error {
 		if err != nil || fi.IsDir() {

cmd/utils/cmd.go

@@ -18,12 +18,14 @@
 package utils
 
 import (
+	"compress/gzip"
 	"fmt"
 	"io"
 	"os"
 	"os/signal"
 	"regexp"
 	"runtime"
+	"strings"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
@@ -133,7 +135,15 @@ func ImportChain(chain *core.BlockChain, fn string) error {
 		return err
 	}
 	defer fh.Close()
-	stream := rlp.NewStream(fh, 0)
+
+	var reader io.Reader = fh
+	if strings.HasSuffix(fn, ".gz") {
+		if reader, err = gzip.NewReader(reader); err != nil {
+			return err
+		}
+	}
+
+	stream := rlp.NewStream(reader, 0)
 
 	// Run actual the import.
 	blocks := make(types.Blocks, importBatchSize)
@@ -195,10 +205,18 @@ func ExportChain(blockchain *core.BlockChain, fn string) error {
 		return err
 	}
 	defer fh.Close()
-	if err := blockchain.Export(fh); err != nil {
+
+	var writer io.Writer = fh
+	if strings.HasSuffix(fn, ".gz") {
+		writer = gzip.NewWriter(writer)
+		defer writer.(*gzip.Writer).Close()
+	}
+
+	if err := blockchain.Export(writer); err != nil {
 		return err
 	}
 	glog.Infoln("Exported blockchain to ", fn)
+
 	return nil
 }
 
@@ -210,7 +228,14 @@ func ExportAppendChain(blockchain *core.BlockChain, fn string, first uint64, las
 		return err
 	}
 	defer fh.Close()
-	if err := blockchain.ExportN(fh, first, last); err != nil {
+
+	var writer io.Writer = fh
+	if strings.HasSuffix(fn, ".gz") {
+		writer = gzip.NewWriter(writer)
+		defer writer.(*gzip.Writer).Close()
+	}
+
+	if err := blockchain.ExportN(writer, first, last); err != nil {
 		return err
 	}
 	glog.Infoln("Exported blockchain to ", fn)

core/blockchain.go

@@ -601,7 +601,11 @@ func (self *BlockChain) procFutureBlocks() {
 	}
 	if len(blocks) > 0 {
 		types.BlockBy(types.Number).Sort(blocks)
-		self.InsertChain(blocks)
+
+		// Insert one by one as chain insertion needs contiguous ancestry between blocks
+		for i := range blocks {
+			self.InsertChain(blocks[i : i+1])
+		}
 	}
 }
 
@@ -675,6 +679,18 @@ func SetReceiptsData(config *params.ChainConfig, block *types.Block, receipts ty
 // transaction and receipt data.
 // XXX should this be moved to the test?
 func (self *BlockChain) InsertReceiptChain(blockChain types.Blocks, receiptChain []types.Receipts) (int, error) {
+	// Do a sanity check that the provided chain is actually ordered and linked
+	for i := 1; i < len(blockChain); i++ {
+		if blockChain[i].NumberU64() != blockChain[i-1].NumberU64()+1 || blockChain[i].ParentHash() != blockChain[i-1].Hash() {
+			// Chain broke ancestry, log a messge (programming error) and skip insertion
+			failure := fmt.Errorf("non contiguous insert: item %d is #%d [%x…], item %d is #%d [%x…] (parent [%x…])", i-1, blockChain[i-1].NumberU64(),
+				blockChain[i-1].Hash().Bytes()[:4], i, blockChain[i].NumberU64(), blockChain[i].Hash().Bytes()[:4], blockChain[i].ParentHash().Bytes()[:4])
+
+			glog.V(logger.Error).Info(failure.Error())
+			return 0, failure
+		}
+	}
+	// Pre-checks passed, start the block body and receipt imports
 	self.wg.Add(1)
 	defer self.wg.Done()
 
@@ -843,6 +859,18 @@ func (self *BlockChain) WriteBlock(block *types.Block) (status WriteStatus, err
 // InsertChain will attempt to insert the given chain in to the canonical chain or, otherwise, create a fork. It an error is returned
 // it will return the index number of the failing block as well an error describing what went wrong (for possible errors see core/errors.go).
 func (self *BlockChain) InsertChain(chain types.Blocks) (int, error) {
+	// Do a sanity check that the provided chain is actually ordered and linked
+	for i := 1; i < len(chain); i++ {
+		if chain[i].NumberU64() != chain[i-1].NumberU64()+1 || chain[i].ParentHash() != chain[i-1].Hash() {
+			// Chain broke ancestry, log a messge (programming error) and skip insertion
+			failure := fmt.Errorf("non contiguous insert: item %d is #%d [%x…], item %d is #%d [%x…] (parent [%x…])",
+				i-1, chain[i-1].NumberU64(), chain[i-1].Hash().Bytes()[:4], i, chain[i].NumberU64(), chain[i].Hash().Bytes()[:4], chain[i].ParentHash().Bytes()[:4])
+
+			glog.V(logger.Error).Info(failure.Error())
+			return 0, failure
+		}
+	}
+	// Pre-checks passed, start the full block imports
 	self.wg.Add(1)
 	defer self.wg.Done()
 
@@ -916,10 +944,8 @@ func (self *BlockChain) InsertChain(chain types.Blocks) (int, error) {
 			}
 
 			self.reportBlock(block, nil, err)
-
 			return i, err
 		}
-
 		// Create a new statedb using the parent block and report an
 		// error if it fails.
 		switch {

core/headerchain.go

@@ -224,6 +224,17 @@ type WhCallback func(*types.Header) error
 // of the header retrieval mechanisms already need to verfy nonces, as well as
 // because nonces can be verified sparsely, not needing to check each.
 func (hc *HeaderChain) InsertHeaderChain(chain []*types.Header, checkFreq int, writeHeader WhCallback) (int, error) {
+	// Do a sanity check that the provided chain is actually ordered and linked
+	for i := 1; i < len(chain); i++ {
+		if chain[i].Number.Uint64() != chain[i-1].Number.Uint64()+1 || chain[i].ParentHash != chain[i-1].Hash() {
+			// Chain broke ancestry, log a messge (programming error) and skip insertion
+			failure := fmt.Errorf("non contiguous insert: item %d is #%d [%x…], item %d is #%d [%x…] (parent [%x…])",
+				i-1, chain[i-1].Number.Uint64(), chain[i-1].Hash().Bytes()[:4], i, chain[i].Number.Uint64(), chain[i].Hash().Bytes()[:4], chain[i].ParentHash.Bytes()[:4])
+
+			glog.V(logger.Error).Info(failure.Error())
+			return 0, failure
+		}
+	}
 	// Collect some import statistics to report on
 	stats := struct{ processed, ignored int }{}
 	start := time.Now()

core/tx_pool.go

@@ -37,15 +37,14 @@ import (
 
 var (
 	// Transaction Pool Errors
-	ErrInvalidSender      = errors.New("Invalid sender")
+	ErrInvalidSender     = errors.New("Invalid sender")
-	ErrNonce              = errors.New("Nonce too low")
+	ErrNonce             = errors.New("Nonce too low")
-	ErrCheap              = errors.New("Gas price too low for acceptance")
+	ErrCheap             = errors.New("Gas price too low for acceptance")
-	ErrBalance            = errors.New("Insufficient balance")
+	ErrBalance           = errors.New("Insufficient balance")
-	ErrNonExistentAccount = errors.New("Account does not exist or account balance too low")
+	ErrInsufficientFunds = errors.New("Insufficient funds for gas * price + value")
-	ErrInsufficientFunds  = errors.New("Insufficient funds for gas * price + value")
+	ErrIntrinsicGas      = errors.New("Intrinsic gas too low")
-	ErrIntrinsicGas       = errors.New("Intrinsic gas too low")
+	ErrGasLimit          = errors.New("Exceeds block gas limit")
-	ErrGasLimit           = errors.New("Exceeds block gas limit")
+	ErrNegativeValue     = errors.New("Negative value")
-	ErrNegativeValue      = errors.New("Negative value")
 )
 
 var (
@@ -124,6 +123,8 @@ func NewTxPool(config *params.ChainConfig, eventMux *event.TypeMux, currentState
 		quit:         make(chan struct{}),
 	}
 
+	pool.resetState()
+
 	pool.wg.Add(2)
 	go pool.eventLoop()
 	go pool.expirationLoop()
@@ -176,7 +177,7 @@ func (pool *TxPool) resetState() {
 	// any transactions that have been included in the block or
 	// have been invalidated because of another transaction (e.g.
 	// higher gas price)
-	pool.demoteUnexecutables()
+	pool.demoteUnexecutables(currentState)
 
 	// Update all accounts to the latest known pending nonce
 	for addr, list := range pool.pending {
@@ -185,7 +186,7 @@ func (pool *TxPool) resetState() {
 	}
 	// Check the queue and move transactions over to the pending if possible
 	// or remove those that have become invalid
-	pool.promoteExecutables()
+	pool.promoteExecutables(currentState)
 }
 
 func (pool *TxPool) Stop() {
@@ -237,21 +238,26 @@ func (pool *TxPool) Content() (map[common.Address]types.Transactions, map[common
 // Pending retrieves all currently processable transactions, groupped by origin
 // account and sorted by nonce. The returned transaction set is a copy and can be
 // freely modified by calling code.
-func (pool *TxPool) Pending() map[common.Address]types.Transactions {
+func (pool *TxPool) Pending() (map[common.Address]types.Transactions, error) {
 	pool.mu.Lock()
 	defer pool.mu.Unlock()
 
+	state, err := pool.currentState()
+	if err != nil {
+		return nil, err
+	}
+
 	// check queue first
-	pool.promoteExecutables()
+	pool.promoteExecutables(state)
 
 	// invalidate any txs
-	pool.demoteUnexecutables()
+	pool.demoteUnexecutables(state)
 
 	pending := make(map[common.Address]types.Transactions)
 	for addr, list := range pool.pending {
 		pending[addr] = list.Flatten()
 	}
-	return pending
+	return pending, nil
 }
 
 // SetLocal marks a transaction as local, skipping gas price
@@ -280,13 +286,6 @@ func (pool *TxPool) validateTx(tx *types.Transaction) error {
 	if err != nil {
 		return ErrInvalidSender
 	}
-
-	// Make sure the account exist. Non existent accounts
-	// haven't got funds and well therefor never pass.
-	if !currentState.Exist(from) {
-		return ErrNonExistentAccount
-	}
-
 	// Last but not least check for nonce errors
 	if currentState.GetNonce(from) > tx.Nonce() {
 		return ErrNonce
@@ -372,10 +371,6 @@ func (pool *TxPool) enqueueTx(hash common.Hash, tx *types.Transaction) {
 //
 // Note, this method assumes the pool lock is held!
 func (pool *TxPool) promoteTx(addr common.Address, hash common.Hash, tx *types.Transaction) {
-	// Init delayed since tx pool could have been started before any state sync
-	if pool.pendingState == nil {
-		pool.resetState()
-	}
 	// Try to insert the transaction into the pending queue
 	if pool.pending[addr] == nil {
 		pool.pending[addr] = newTxList(true)
@@ -410,13 +405,19 @@ func (pool *TxPool) Add(tx *types.Transaction) error {
 	if err := pool.add(tx); err != nil {
 		return err
 	}
-	pool.promoteExecutables()
+
+	state, err := pool.currentState()
+	if err != nil {
+		return err
+	}
+
+	pool.promoteExecutables(state)
 
 	return nil
 }
 
 // AddBatch attempts to queue a batch of transactions.
-func (pool *TxPool) AddBatch(txs []*types.Transaction) {
+func (pool *TxPool) AddBatch(txs []*types.Transaction) error {
 	pool.mu.Lock()
 	defer pool.mu.Unlock()
 
@@ -425,7 +426,15 @@ func (pool *TxPool) AddBatch(txs []*types.Transaction) {
 			glog.V(logger.Debug).Infoln("tx error:", err)
 		}
 	}
-	pool.promoteExecutables()
+
+	state, err := pool.currentState()
+	if err != nil {
+		return err
+	}
+
+	pool.promoteExecutables(state)
+
+	return nil
 }
 
 // Get returns a transaction if it is contained in the pool
@@ -499,17 +508,7 @@ func (pool *TxPool) removeTx(hash common.Hash) {
 // promoteExecutables moves transactions that have become processable from the
 // future queue to the set of pending transactions. During this process, all
 // invalidated transactions (low nonce, low balance) are deleted.
-func (pool *TxPool) promoteExecutables() {
+func (pool *TxPool) promoteExecutables(state *state.StateDB) {
-	// Init delayed since tx pool could have been started before any state sync
-	if pool.pendingState == nil {
-		pool.resetState()
-	}
-	// Retrieve the current state to allow nonce and balance checking
-	state, err := pool.currentState()
-	if err != nil {
-		glog.Errorf("Could not get current state: %v", err)
-		return
-	}
 	// Iterate over all accounts and promote any executable transactions
 	queued := uint64(0)
 	for addr, list := range pool.queue {
@@ -645,13 +644,7 @@ func (pool *TxPool) promoteExecutables() {
 // demoteUnexecutables removes invalid and processed transactions from the pools
 // executable/pending queue and any subsequent transactions that become unexecutable
 // are moved back into the future queue.
-func (pool *TxPool) demoteUnexecutables() {
+func (pool *TxPool) demoteUnexecutables(state *state.StateDB) {
-	// Retrieve the current state to allow nonce and balance checking
-	state, err := pool.currentState()
-	if err != nil {
-		glog.V(logger.Info).Infoln("failed to get current state: %v", err)
-		return
-	}
 	// Iterate over all accounts and demote any non-executable transactions
 	for addr, list := range pool.pending {
 		nonce := state.GetNonce(addr)

core/tx_pool_test.go

@@ -51,14 +51,84 @@ func deriveSender(tx *types.Transaction) (common.Address, error) {
 	return types.Sender(types.HomesteadSigner{}, tx)
 }
 
+// This test simulates a scenario where a new block is imported during a
+// state reset and tests whether the pending state is in sync with the
+// block head event that initiated the resetState().
+func TestStateChangeDuringPoolReset(t *testing.T) {
+	var (
+		db, _      = ethdb.NewMemDatabase()
+		key, _     = crypto.GenerateKey()
+		address    = crypto.PubkeyToAddress(key.PublicKey)
+		mux        = new(event.TypeMux)
+		statedb, _ = state.New(common.Hash{}, db)
+		trigger    = false
+	)
+
+	// setup pool with 2 transaction in it
+	statedb.SetBalance(address, new(big.Int).Mul(common.Big1, common.Ether))
+
+	tx0 := transaction(0, big.NewInt(100000), key)
+	tx1 := transaction(1, big.NewInt(100000), key)
+
+	// stateFunc is used multiple times to reset the pending state.
+	// when simulate is true it will create a state that indicates
+	// that tx0 and tx1 are included in the chain.
+	stateFunc := func() (*state.StateDB, error) {
+		// delay "state change" by one. The tx pool fetches the
+		// state multiple times and by delaying it a bit we simulate
+		// a state change between those fetches.
+		stdb := statedb
+		if trigger {
+			statedb, _ = state.New(common.Hash{}, db)
+			// simulate that the new head block included tx0 and tx1
+			statedb.SetNonce(address, 2)
+			statedb.SetBalance(address, new(big.Int).Mul(common.Big1, common.Ether))
+			trigger = false
+		}
+		return stdb, nil
+	}
+
+	gasLimitFunc := func() *big.Int { return big.NewInt(1000000000) }
+
+	txpool := NewTxPool(testChainConfig(), mux, stateFunc, gasLimitFunc)
+	txpool.resetState()
+
+	nonce := txpool.State().GetNonce(address)
+	if nonce != 0 {
+		t.Fatalf("Invalid nonce, want 0, got %d", nonce)
+	}
+
+	txpool.AddBatch(types.Transactions{tx0, tx1})
+
+	nonce = txpool.State().GetNonce(address)
+	if nonce != 2 {
+		t.Fatalf("Invalid nonce, want 2, got %d", nonce)
+	}
+
+	// trigger state change in the background
+	trigger = true
+
+	txpool.resetState()
+
+	pendingTx, err := txpool.Pending()
+	if err != nil {
+		t.Fatalf("Could not fetch pending transactions: %v", err)
+	}
+
+	for addr, txs := range pendingTx {
+		t.Logf("%0x: %d\n", addr, len(txs))
+	}
+
+	nonce = txpool.State().GetNonce(address)
+	if nonce != 2 {
+		t.Fatalf("Invalid nonce, want 2, got %d", nonce)
+	}
+}
+
 func TestInvalidTransactions(t *testing.T) {
 	pool, key := setupTxPool()
 
 	tx := transaction(0, big.NewInt(100), key)
-	if err := pool.Add(tx); err != ErrNonExistentAccount {
-		t.Error("expected", ErrNonExistentAccount)
-	}
-
 	from, _ := deriveSender(tx)
 	currentState, _ := pool.currentState()
 	currentState.AddBalance(from, big.NewInt(1))
@@ -97,9 +167,10 @@ func TestTransactionQueue(t *testing.T) {
 	from, _ := deriveSender(tx)
 	currentState, _ := pool.currentState()
 	currentState.AddBalance(from, big.NewInt(1000))
+	pool.resetState()
 	pool.enqueueTx(tx.Hash(), tx)
 
-	pool.promoteExecutables()
+	pool.promoteExecutables(currentState)
 	if len(pool.pending) != 1 {
 		t.Error("expected valid txs to be 1 is", len(pool.pending))
 	}
@@ -108,7 +179,7 @@ func TestTransactionQueue(t *testing.T) {
 	from, _ = deriveSender(tx)
 	currentState.SetNonce(from, 2)
 	pool.enqueueTx(tx.Hash(), tx)
-	pool.promoteExecutables()
+	pool.promoteExecutables(currentState)
 	if _, ok := pool.pending[from].txs.items[tx.Nonce()]; ok {
 		t.Error("expected transaction to be in tx pool")
 	}
@@ -124,11 +195,13 @@ func TestTransactionQueue(t *testing.T) {
 	from, _ = deriveSender(tx1)
 	currentState, _ = pool.currentState()
 	currentState.AddBalance(from, big.NewInt(1000))
+	pool.resetState()
+
 	pool.enqueueTx(tx1.Hash(), tx1)
 	pool.enqueueTx(tx2.Hash(), tx2)
 	pool.enqueueTx(tx3.Hash(), tx3)
 
-	pool.promoteExecutables()
+	pool.promoteExecutables(currentState)
 
 	if len(pool.pending) != 1 {
 		t.Error("expected tx pool to be 1, got", len(pool.pending))
@@ -225,7 +298,8 @@ func TestTransactionDoubleNonce(t *testing.T) {
 	if err := pool.add(tx2); err != nil {
 		t.Error("didn't expect error", err)
 	}
-	pool.promoteExecutables()
+	state, _ := pool.currentState()
+	pool.promoteExecutables(state)
 	if pool.pending[addr].Len() != 1 {
 		t.Error("expected 1 pending transactions, got", pool.pending[addr].Len())
 	}
@@ -236,7 +310,7 @@ func TestTransactionDoubleNonce(t *testing.T) {
 	if err := pool.add(tx3); err != nil {
 		t.Error("didn't expect error", err)
 	}
-	pool.promoteExecutables()
+	pool.promoteExecutables(state)
 	if pool.pending[addr].Len() != 1 {
 		t.Error("expected 1 pending transactions, got", pool.pending[addr].Len())
 	}
@@ -295,6 +369,7 @@ func TestRemovedTxEvent(t *testing.T) {
 	from, _ := deriveSender(tx)
 	currentState, _ := pool.currentState()
 	currentState.AddBalance(from, big.NewInt(1000000000000))
+	pool.resetState()
 	pool.eventMux.Post(RemovedTransactionEvent{types.Transactions{tx}})
 	pool.eventMux.Post(ChainHeadEvent{nil})
 	if pool.pending[from].Len() != 1 {
@@ -452,6 +527,7 @@ func TestTransactionQueueAccountLimiting(t *testing.T) {
 
 	state, _ := pool.currentState()
 	state.AddBalance(account, big.NewInt(1000000))
+	pool.resetState()
 
 	// Keep queuing up transactions and make sure all above a limit are dropped
 	for i := uint64(1); i <= maxQueuedPerAccount+5; i++ {
@@ -564,6 +640,7 @@ func TestTransactionPendingLimiting(t *testing.T) {
 
 	state, _ := pool.currentState()
 	state.AddBalance(account, big.NewInt(1000000))
+	pool.resetState()
 
 	// Keep queuing up transactions and make sure all above a limit are dropped
 	for i := uint64(0); i < maxQueuedPerAccount+5; i++ {
@@ -733,7 +810,7 @@ func benchmarkPendingDemotion(b *testing.B, size int) {
 	// Benchmark the speed of pool validation
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
-		pool.demoteUnexecutables()
+		pool.demoteUnexecutables(state)
 	}
 }
 
@@ -757,7 +834,7 @@ func benchmarkFuturePromotion(b *testing.B, size int) {
 	// Benchmark the speed of pool validation
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
-		pool.promoteExecutables()
+		pool.promoteExecutables(state)
 	}
 }
 

eth/api.go

@@ -18,6 +18,7 @@ package eth
 
 import (
 	"bytes"
+	"compress/gzip"
 	"errors"
 	"fmt"
 	"io"
@@ -25,6 +26,7 @@ import (
 	"math/big"
 	"os"
 	"runtime"
+	"strings"
 	"time"
 
 	"github.com/ethereum/ethash"
@@ -80,7 +82,7 @@ type PublicMinerAPI struct {
 
 // NewPublicMinerAPI create a new PublicMinerAPI instance.
 func NewPublicMinerAPI(e *Ethereum) *PublicMinerAPI {
-	agent := miner.NewRemoteAgent()
+	agent := miner.NewRemoteAgent(e.Pow())
 	e.Miner().Register(agent)
 
 	return &PublicMinerAPI{e, agent}
@@ -217,8 +219,14 @@ func (api *PrivateAdminAPI) ExportChain(file string) (bool, error) {
 	}
 	defer out.Close()
 
+	var writer io.Writer = out
+	if strings.HasSuffix(file, ".gz") {
+		writer = gzip.NewWriter(writer)
+		defer writer.(*gzip.Writer).Close()
+	}
+
 	// Export the blockchain
-	if err := api.eth.BlockChain().Export(out); err != nil {
+	if err := api.eth.BlockChain().Export(writer); err != nil {
 		return false, err
 	}
 	return true, nil
@@ -243,8 +251,15 @@ func (api *PrivateAdminAPI) ImportChain(file string) (bool, error) {
 	}
 	defer in.Close()
 
+	var reader io.Reader = in
+	if strings.HasSuffix(file, ".gz") {
+		if reader, err = gzip.NewReader(reader); err != nil {
+			return false, err
+		}
+	}
+
 	// Run actual the import in pre-configured batches
-	stream := rlp.NewStream(in, 0)
+	stream := rlp.NewStream(reader, 0)
 
 	blocks, index := make([]*types.Block, 0, 2500), 0
 	for batch := 0; ; batch++ {

eth/api_backend.go

@@ -131,15 +131,20 @@ func (b *EthApiBackend) RemoveTx(txHash common.Hash) {
 	b.eth.txPool.Remove(txHash)
 }
 
-func (b *EthApiBackend) GetPoolTransactions() types.Transactions {
+func (b *EthApiBackend) GetPoolTransactions() (types.Transactions, error) {
 	b.eth.txMu.Lock()
 	defer b.eth.txMu.Unlock()
 
+	pending, err := b.eth.txPool.Pending()
+	if err != nil {
+		return nil, err
+	}
+
 	var txs types.Transactions
-	for _, batch := range b.eth.txPool.Pending() {
+	for _, batch := range pending {
 		txs = append(txs, batch...)
 	}
-	return txs
+	return txs, nil
 }
 
 func (b *EthApiBackend) GetPoolTransaction(hash common.Hash) *types.Transaction {

eth/backend.go

@@ -104,6 +104,7 @@ type Config struct {
 
 type LesServer interface {
 	Start(srvr *p2p.Server)
+	Synced()
 	Stop()
 	Protocols() []p2p.Protocol
 }
@@ -145,6 +146,7 @@ type Ethereum struct {
 
 func (s *Ethereum) AddLesServer(ls LesServer) {
 	s.lesServer = ls
+	s.protocolManager.lesServer = ls
 }
 
 // New creates a new Ethereum object (including the

eth/filters/filter.go

@@ -54,6 +54,8 @@ type Filter struct {
 
 // New creates a new filter which uses a bloom filter on blocks to figure out whether
 // a particular block is interesting or not.
+// MipMaps allow past blocks to be searched much more efficiently, but are not available
+// to light clients.
 func New(backend Backend, useMipMap bool) *Filter {
 	return &Filter{
 		backend:   backend,
@@ -85,8 +87,11 @@ func (f *Filter) SetTopics(topics [][]common.Hash) {
 	f.topics = topics
 }
 
-// Run filters logs with the current parameters set
+// FindOnce searches the blockchain for matching log entries, returning
-func (f *Filter) Find(ctx context.Context) ([]*vm.Log, error) {
+// all matching entries from the first block that contains matches,
+// updating the start point of the filter accordingly. If no results are
+// found, a nil slice is returned.
+func (f *Filter) FindOnce(ctx context.Context) ([]*vm.Log, error) {
 	head, _ := f.backend.HeaderByNumber(ctx, rpc.LatestBlockNumber)
 	if head == nil {
 		return nil, nil
@@ -106,47 +111,69 @@ func (f *Filter) Find(ctx context.Context) ([]*vm.Log, error) {
 	// uses the mipmap bloom filters to check for fast inclusion and uses
 	// higher range probability in order to ensure at least a false positive
 	if !f.useMipMap || len(f.addresses) == 0 {
-		return f.getLogs(ctx, beginBlockNo, endBlockNo)
+		logs, blockNumber, err := f.getLogs(ctx, beginBlockNo, endBlockNo)
+		f.begin = int64(blockNumber + 1)
+		return logs, err
 	}
-	return f.mipFind(beginBlockNo, endBlockNo, 0), nil
+
+	logs, blockNumber := f.mipFind(beginBlockNo, endBlockNo, 0)
+	f.begin = int64(blockNumber + 1)
+	return logs, nil
 }
 
-func (f *Filter) mipFind(start, end uint64, depth int) (logs []*vm.Log) {
+// Run filters logs with the current parameters set
+func (f *Filter) Find(ctx context.Context) (logs []*vm.Log, err error) {
+	for {
+		newLogs, err := f.FindOnce(ctx)
+		if len(newLogs) == 0 || err != nil {
+			return logs, err
+		}
+		logs = append(logs, newLogs...)
+	}
+}
+
+func (f *Filter) mipFind(start, end uint64, depth int) (logs []*vm.Log, blockNumber uint64) {
 	level := core.MIPMapLevels[depth]
 	// normalise numerator so we can work in level specific batches and
 	// work with the proper range checks
 	for num := start / level * level; num <= end; num += level {
 		// find addresses in bloom filters
 		bloom := core.GetMipmapBloom(f.db, num, level)
+		// Don't bother checking the first time through the loop - we're probably picking
+		// up where a previous run left off.
+		first := true
 		for _, addr := range f.addresses {
-			if bloom.TestBytes(addr[:]) {
+			if first || bloom.TestBytes(addr[:]) {
+				first = false
 				// range check normalised values and make sure that
 				// we're resolving the correct range instead of the
 				// normalised values.
 				start := uint64(math.Max(float64(num), float64(start)))
 				end := uint64(math.Min(float64(num+level-1), float64(end)))
 				if depth+1 == len(core.MIPMapLevels) {
-					l, _ := f.getLogs(context.Background(), start, end)
+					l, blockNumber, _ := f.getLogs(context.Background(), start, end)
-					logs = append(logs, l...)
+					if len(l) > 0 {
+						return l, blockNumber
+					}
 				} else {
-					logs = append(logs, f.mipFind(start, end, depth+1)...)
+					l, blockNumber := f.mipFind(start, end, depth+1)
+					if len(l) > 0 {
+						return l, blockNumber
+					}
 				}
-				// break so we don't check the same range for each
-				// possible address. Checks on multiple addresses
-				// are handled further down the stack.
-				break
 			}
 		}
 	}
 
-	return logs
+	return nil, end
 }
 
-func (f *Filter) getLogs(ctx context.Context, start, end uint64) (logs []*vm.Log, err error) {
+func (f *Filter) getLogs(ctx context.Context, start, end uint64) (logs []*vm.Log, blockNumber uint64, err error) {
 	for i := start; i <= end; i++ {
-		header, err := f.backend.HeaderByNumber(ctx, rpc.BlockNumber(i))
+		blockNumber := rpc.BlockNumber(i)
+		header, err := f.backend.HeaderByNumber(ctx, blockNumber)
 		if header == nil || err != nil {
-			return logs, err
+			return logs, end, err
 		}
 
 		// Use bloom filtering to see if this block is interesting given the
@@ -155,17 +182,20 @@ func (f *Filter) getLogs(ctx context.Context, start, end uint64) (logs []*vm.Log
 			// Get the logs of the block
 			receipts, err := f.backend.GetReceipts(ctx, header.Hash())
 			if err != nil {
-				return nil, err
+				return nil, end, err
 			}
 			var unfiltered []*vm.Log
 			for _, receipt := range receipts {
 				unfiltered = append(unfiltered, ([]*vm.Log)(receipt.Logs)...)
 			}
-			logs = append(logs, filterLogs(unfiltered, nil, nil, f.addresses, f.topics)...)
+			logs = filterLogs(unfiltered, nil, nil, f.addresses, f.topics)
+			if len(logs) > 0 {
+				return logs, uint64(blockNumber), nil
+			}
 		}
 	}
 
-	return logs, nil
+	return logs, end, nil
 }
 
 func includes(addresses []common.Address, a common.Address) bool {

eth/handler.go

@@ -87,6 +87,8 @@ type ProtocolManager struct {
 	quitSync    chan struct{}
 	noMorePeers chan struct{}
 
+	lesServer LesServer
+
 	// wait group is used for graceful shutdowns during downloading
 	// and processing
 	wg sync.WaitGroup
@@ -171,7 +173,7 @@ func NewProtocolManager(config *params.ChainConfig, fastSync bool, networkId int
 		return blockchain.CurrentBlock().NumberU64()
 	}
 	inserter := func(blocks types.Blocks) (int, error) {
-		atomic.StoreUint32(&manager.synced, 1) // Mark initial sync done on any fetcher import
+		manager.setSynced() // Mark initial sync done on any fetcher import
 		return manager.insertChain(blocks)
 	}
 	manager.fetcher = fetcher.New(blockchain.GetBlockByHash, validator, manager.BroadcastBlock, heighter, inserter, manager.removePeer)

eth/helper_test.go

@@ -93,7 +93,7 @@ type testTxPool struct {
 
 // AddBatch appends a batch of transactions to the pool, and notifies any
 // listeners if the addition channel is non nil
-func (p *testTxPool) AddBatch(txs []*types.Transaction) {
+func (p *testTxPool) AddBatch(txs []*types.Transaction) error {
 	p.lock.Lock()
 	defer p.lock.Unlock()
 
@@ -101,10 +101,12 @@ func (p *testTxPool) AddBatch(txs []*types.Transaction) {
 	if p.added != nil {
 		p.added <- txs
 	}
+
+	return nil
 }
 
 // Pending returns all the transactions known to the pool
-func (p *testTxPool) Pending() map[common.Address]types.Transactions {
+func (p *testTxPool) Pending() (map[common.Address]types.Transactions, error) {
 	p.lock.RLock()
 	defer p.lock.RUnlock()
 
@@ -116,7 +118,7 @@ func (p *testTxPool) Pending() map[common.Address]types.Transactions {
 	for _, batch := range batches {
 		sort.Sort(types.TxByNonce(batch))
 	}
-	return batches
+	return batches, nil
 }
 
 // newTestTransaction create a new dummy transaction.

eth/protocol.go

@@ -98,11 +98,11 @@ var errorToString = map[int]string{
 
 type txPool interface {
 	// AddBatch should add the given transactions to the pool.
-	AddBatch([]*types.Transaction)
+	AddBatch([]*types.Transaction) error
 
 	// Pending should return pending transactions.
 	// The slice should be modifiable by the caller.
-	Pending() map[common.Address]types.Transactions
+	Pending() (map[common.Address]types.Transactions, error)
 }
 
 // statusData is the network packet for the status message.

eth/sync.go

@@ -46,7 +46,8 @@ type txsync struct {
 // syncTransactions starts sending all currently pending transactions to the given peer.
 func (pm *ProtocolManager) syncTransactions(p *peer) {
 	var txs types.Transactions
-	for _, batch := range pm.txpool.Pending() {
+	pending, _ := pm.txpool.Pending()
+	for _, batch := range pending {
 		txs = append(txs, batch...)
 	}
 	if len(txs) == 0 {
@@ -180,7 +181,7 @@ func (pm *ProtocolManager) synchronise(peer *peer) {
 	if err := pm.downloader.Synchronise(peer.id, pHead, pTd, mode); err != nil {
 		return
 	}
-	atomic.StoreUint32(&pm.synced, 1) // Mark initial sync done
+	pm.setSynced() // Mark initial sync done
 
 	// If fast sync was enabled, and we synced up, disable it
 	if atomic.LoadUint32(&pm.fastSync) == 1 {
@@ -191,3 +192,10 @@ func (pm *ProtocolManager) synchronise(peer *peer) {
 		}
 	}
 }
+
+// setSynced sets the synced flag and notifies the light server if present
+func (pm *ProtocolManager) setSynced() {
+	if atomic.SwapUint32(&pm.synced, 1) == 0 && pm.lesServer != nil {
+		pm.lesServer.Synced()
+	}
+}

ethstats/ethstats.go

@@ -25,6 +25,7 @@ import (
 	"regexp"
 	"runtime"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -41,6 +42,10 @@ import (
 	"golang.org/x/net/websocket"
 )
 
+// historyUpdateRange is the number of blocks a node should report upon login or
+// history request.
+const historyUpdateRange = 50
+
 // Service implements an Ethereum netstats reporting daemon that pushes local
 // chain statistics up to a monitoring server.
 type Service struct {
@@ -53,6 +58,9 @@ type Service struct {
 	node string // Name of the node to display on the monitoring page
 	pass string // Password to authorize access to the monitoring page
 	host string // Remote address of the monitoring service
+
+	pongCh chan struct{} // Pong notifications are fed into this channel
+	histCh chan []uint64 // History request block numbers are fed into this channel
 }
 
 // New returns a monitoring service ready for stats reporting.
@@ -65,11 +73,13 @@ func New(url string, ethServ *eth.Ethereum, lesServ *les.LightEthereum) (*Servic
 	}
 	// Assemble and return the stats service
 	return &Service{
-		eth:  ethServ,
+		eth:    ethServ,
-		les:  lesServ,
+		les:    lesServ,
-		node: parts[1],
+		node:   parts[1],
-		pass: parts[3],
+		pass:   parts[3],
-		host: parts[4],
+		host:   parts[4],
+		pongCh: make(chan struct{}),
+		histCh: make(chan []uint64, 1),
 	}, nil
 }
 
@@ -115,7 +125,11 @@ func (s *Service) loop() {
 	// Loop reporting until termination
 	for {
 		// Establish a websocket connection to the server and authenticate the node
-		conn, err := websocket.Dial(fmt.Sprintf("wss://%s/api", s.host), "", "http://localhost/")
+		url := fmt.Sprintf("%s/api", s.host)
+		if !strings.Contains(url, "://") {
+			url = "wss://" + url
+		}
+		conn, err := websocket.Dial(url, "", "http://localhost/")
 		if err != nil {
 			glog.V(logger.Warn).Infof("Stats server unreachable: %v", err)
 			time.Sleep(10 * time.Second)
@@ -130,22 +144,34 @@ func (s *Service) loop() {
 			time.Sleep(10 * time.Second)
 			continue
 		}
-		if err = s.report(in, out); err != nil {
+		go s.readLoop(conn, in)
+
+		// Send the initial stats so our node looks decent from the get go
+		if err = s.report(out); err != nil {
 			glog.V(logger.Warn).Infof("Initial stats report failed: %v", err)
 			conn.Close()
 			continue
 		}
+		if err = s.reportHistory(out, nil); err != nil {
+			glog.V(logger.Warn).Infof("History report failed: %v", err)
+			conn.Close()
+			continue
+		}
 		// Keep sending status updates until the connection breaks
 		fullReport := time.NewTicker(15 * time.Second)
 
 		for err == nil {
 			select {
 			case <-fullReport.C:
-				if err = s.report(in, out); err != nil {
+				if err = s.report(out); err != nil {
 					glog.V(logger.Warn).Infof("Full stats report failed: %v", err)
 				}
-			case head := <-headSub.Chan():
+			case list := <-s.histCh:
-				if head == nil { // node stopped
+				if err = s.reportHistory(out, list); err != nil {
+					glog.V(logger.Warn).Infof("Block history report failed: %v", err)
+				}
+			case head, ok := <-headSub.Chan():
+				if !ok { // node stopped
 					conn.Close()
 					return
 				}
@@ -155,8 +181,8 @@ func (s *Service) loop() {
 				if err = s.reportPending(out); err != nil {
 					glog.V(logger.Warn).Infof("Post-block transaction stats report failed: %v", err)
 				}
-			case ev := <-txSub.Chan():
+			case _, ok := <-txSub.Chan():
-				if ev == nil { // node stopped
+				if !ok { // node stopped
 					conn.Close()
 					return
 				}
@@ -178,6 +204,76 @@ func (s *Service) loop() {
 	}
 }
 
+// readLoop loops as long as the connection is alive and retrieves data packets
+// from the network socket. If any of them match an active request, it forwards
+// it, if they themselves are requests it initiates a reply, and lastly it drops
+// unknown packets.
+func (s *Service) readLoop(conn *websocket.Conn, in *json.Decoder) {
+	// If the read loop exists, close the connection
+	defer conn.Close()
+
+	for {
+		// Retrieve the next generic network packet and bail out on error
+		var msg map[string][]interface{}
+		if err := in.Decode(&msg); err != nil {
+			glog.V(logger.Warn).Infof("Failed to decode stats server message: %v", err)
+			return
+		}
+		if len(msg["emit"]) == 0 {
+			glog.V(logger.Warn).Infof("Stats server sent non-broadcast: %v", msg)
+			return
+		}
+		command, ok := msg["emit"][0].(string)
+		if !ok {
+			glog.V(logger.Warn).Infof("Invalid stats server message type: %v", msg["emit"][0])
+			return
+		}
+		// If the message is a ping reply, deliver (someone must be listening!)
+		if len(msg["emit"]) == 2 && command == "node-pong" {
+			select {
+			case s.pongCh <- struct{}{}:
+				// Pong delivered, continue listening
+				continue
+			default:
+				// Ping routine dead, abort
+				glog.V(logger.Warn).Infof("Stats server pinger seems to have died")
+				return
+			}
+		}
+		// If the message is a history request, forward to the event processor
+		if len(msg["emit"]) == 2 && command == "history" {
+			// Make sure the request is valid and doesn't crash us
+			request, ok := msg["emit"][1].(map[string]interface{})
+			if !ok {
+				glog.V(logger.Warn).Infof("Invalid history request: %v", msg["emit"][1])
+				return
+			}
+			list, ok := request["list"].([]interface{})
+			if !ok {
+				glog.V(logger.Warn).Infof("Invalid history block list: %v", request["list"])
+				return
+			}
+			// Convert the block number list to an integer list
+			numbers := make([]uint64, len(list))
+			for i, num := range list {
+				n, ok := num.(float64)
+				if !ok {
+					glog.V(logger.Warn).Infof("Invalid history block number: %v", num)
+					return
+				}
+				numbers[i] = uint64(n)
+			}
+			select {
+			case s.histCh <- numbers:
+				continue
+			default:
+			}
+		}
+		// Report anything else and continue
+		glog.V(logger.Info).Infof("Unknown stats message: %v", msg)
+	}
+}
+
 // nodeInfo is the collection of metainformation about a node that is displayed
 // on the monitoring page.
 type nodeInfo struct {
@@ -190,6 +286,7 @@ type nodeInfo struct {
 	Os       string `json:"os"`
 	OsVer    string `json:"os_v"`
 	Client   string `json:"client"`
+	History  bool   `json:"canUpdateHistory"`
 }
 
 // authMsg is the authentication infos needed to login to a monitoring server.
@@ -224,6 +321,7 @@ func (s *Service) login(in *json.Decoder, out *json.Encoder) error {
 			Os:       runtime.GOOS,
 			OsVer:    runtime.GOARCH,
 			Client:   "0.1.1",
+			History:  true,
 		},
 		Secret: s.pass,
 	}
@@ -244,8 +342,8 @@ func (s *Service) login(in *json.Decoder, out *json.Encoder) error {
 // report collects all possible data to report and send it to the stats server.
 // This should only be used on reconnects or rarely to avoid overloading the
 // server. Use the individual methods for reporting subscribed events.
-func (s *Service) report(in *json.Decoder, out *json.Encoder) error {
+func (s *Service) report(out *json.Encoder) error {
-	if err := s.reportLatency(in, out); err != nil {
+	if err := s.reportLatency(out); err != nil {
 		return err
 	}
 	if err := s.reportBlock(out, nil); err != nil {
@@ -262,7 +360,7 @@ func (s *Service) report(in *json.Decoder, out *json.Encoder) error {
 
 // reportLatency sends a ping request to the server, measures the RTT time and
 // finally sends a latency update.
-func (s *Service) reportLatency(in *json.Decoder, out *json.Encoder) error {
+func (s *Service) reportLatency(out *json.Encoder) error {
 	// Send the current time to the ethstats server
 	start := time.Now()
 
@@ -276,9 +374,12 @@ func (s *Service) reportLatency(in *json.Decoder, out *json.Encoder) error {
 		return err
 	}
 	// Wait for the pong request to arrive back
-	var pong map[string][]interface{}
+	select {
-	if err := in.Decode(&pong); err != nil || len(pong["emit"]) != 2 || pong["emit"][0].(string) != "node-pong" {
+	case <-s.pongCh:
-		return errors.New("unexpected ping reply")
+		// Pong delivered, report the latency
+	case <-time.After(3 * time.Second):
+		// Ping timeout, abort
+		return errors.New("ping timed out")
 	}
 	// Send back the measured latency
 	latency := map[string][]interface{}{
@@ -297,6 +398,7 @@ func (s *Service) reportLatency(in *json.Decoder, out *json.Encoder) error {
 type blockStats struct {
 	Number    *big.Int       `json:"number"`
 	Hash      common.Hash    `json:"hash"`
+	Timestamp *big.Int       `json:"timestamp"`
 	Miner     common.Address `json:"miner"`
 	GasUsed   *big.Int       `json:"gasUsed"`
 	GasLimit  *big.Int       `json:"gasLimit"`
@@ -330,9 +432,26 @@ func (s uncleStats) MarshalJSON() ([]byte, error) {
 
 // reportBlock retrieves the current chain head and repors it to the stats server.
 func (s *Service) reportBlock(out *json.Encoder, block *types.Block) error {
-	// Gather the head block infos from the local blockchain
+	// Assemble the block stats report and send it to the server
+	stats := map[string]interface{}{
+		"id":    s.node,
+		"block": s.assembleBlockStats(block),
+	}
+	report := map[string][]interface{}{
+		"emit": []interface{}{"block", stats},
+	}
+	if err := out.Encode(report); err != nil {
+		return err
+	}
+	return nil
+}
+
+// assembleBlockStats retrieves any required metadata to report a single block
+// and assembles the block stats. If block is nil, the current head is processed.
+func (s *Service) assembleBlockStats(block *types.Block) *blockStats {
+	// Gather the block infos from the local blockchain
 	var (
-		head   *types.Header
+		header *types.Header
 		td     *big.Int
 		txs    []*types.Transaction
 		uncles []*types.Header
@@ -342,37 +461,77 @@ func (s *Service) reportBlock(out *json.Encoder, block *types.Block) error {
 		if block == nil {
 			block = s.eth.BlockChain().CurrentBlock()
 		}
-		head = block.Header()
+		header = block.Header()
-		td = s.eth.BlockChain().GetTd(head.Hash(), head.Number.Uint64())
+		td = s.eth.BlockChain().GetTd(header.Hash(), header.Number.Uint64())
 
 		txs = block.Transactions()
 		uncles = block.Uncles()
 	} else {
 		// Light nodes would need on-demand lookups for transactions/uncles, skip
 		if block != nil {
-			head = block.Header()
+			header = block.Header()
+		} else {
+			header = s.les.BlockChain().CurrentHeader()
+		}
+		td = s.les.BlockChain().GetTd(header.Hash(), header.Number.Uint64())
+	}
+	// Assemble and return the block stats
+	return &blockStats{
+		Number:    header.Number,
+		Hash:      header.Hash(),
+		Timestamp: header.Time,
+		Miner:     header.Coinbase,
+		GasUsed:   new(big.Int).Set(header.GasUsed),
+		GasLimit:  new(big.Int).Set(header.GasLimit),
+		Diff:      header.Difficulty.String(),
+		TotalDiff: td.String(),
+		Txs:       txs,
+		Uncles:    uncles,
+	}
+}
+
+// reportHistory retrieves the most recent batch of blocks and reports it to the
+// stats server.
+func (s *Service) reportHistory(out *json.Encoder, list []uint64) error {
+	// Figure out the indexes that need reporting
+	indexes := make([]uint64, 0, historyUpdateRange)
+	if len(list) > 0 {
+		// Specific indexes requested, send them back in particular
+		for _, idx := range list {
+			indexes = append(indexes, idx)
+		}
+	} else {
+		// No indexes requested, send back the top ones
+		var head *types.Header
+		if s.eth != nil {
+			head = s.eth.BlockChain().CurrentHeader()
 		} else {
 			head = s.les.BlockChain().CurrentHeader()
 		}
-		td = s.les.BlockChain().GetTd(head.Hash(), head.Number.Uint64())
+		start := head.Number.Int64() - historyUpdateRange
+		if start < 0 {
+			start = 0
+		}
+		for i := uint64(start); i <= head.Number.Uint64(); i++ {
+			indexes = append(indexes, i)
+		}
 	}
-	// Assemble the block stats report and send it to the server
+	// Gather the batch of blocks to report
+	history := make([]*blockStats, len(indexes))
+	for i, number := range indexes {
+		if s.eth != nil {
+			history[i] = s.assembleBlockStats(s.eth.BlockChain().GetBlockByNumber(number))
+		} else {
+			history[i] = s.assembleBlockStats(types.NewBlockWithHeader(s.les.BlockChain().GetHeaderByNumber(number)))
+		}
+	}
+	// Assemble the history report and send it to the server
 	stats := map[string]interface{}{
-		"id": s.node,
+		"id":      s.node,
-		"block": &blockStats{
+		"history": history,
-			Number:    head.Number,
-			Hash:      head.Hash(),
-			Miner:     head.Coinbase,
-			GasUsed:   new(big.Int).Set(head.GasUsed),
-			GasLimit:  new(big.Int).Set(head.GasLimit),
-			Diff:      head.Difficulty.String(),
-			TotalDiff: td.String(),
-			Txs:       txs,
-			Uncles:    uncles,
-		},
 	}
 	report := map[string][]interface{}{
-		"emit": []interface{}{"block", stats},
+		"emit": []interface{}{"history", stats},
 	}
 	if err := out.Encode(report); err != nil {
 		return err

internal/ethapi/api.go

@@ -28,6 +28,7 @@ import (
 	"github.com/ethereum/ethash"
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/core/vm"
@@ -289,14 +290,14 @@ func (s *PrivateAccountAPI) SendTransaction(ctx context.Context, args SendTxArgs
 }
 
 // signHash is a helper function that calculates a hash for the given message that can be
-// safely used to calculate a signature from. The hash is calulcated with:
+// safely used to calculate a signature from.
-// keccak256("\x19Ethereum Signed Message:\n"${message length}${message}).
+//
-func signHash(message string) []byte {
+// The hash is calulcated as
-	data := common.FromHex(message)
+//   keccak256("\x19Ethereum Signed Message:\n"${message length}${message}).
-	// Give context to the signed message. This prevents an adversery to sign a tx.
+//
-	// It has no cryptographic purpose.
+// This gives context to the signed message and prevents signing of transactions.
+func signHash(data []byte) []byte {
 	msg := fmt.Sprintf("\x19Ethereum Signed Message:\n%d%s", len(data), data)
-	// Always hash, this prevents choosen plaintext attacks that can extract key information
 	return crypto.Keccak256([]byte(msg))
 }
 
@@ -306,13 +307,8 @@ func signHash(message string) []byte {
 // The key used to calculate the signature is decrypted with the given password.
 //
 // https://github.com/ethereum/go-ethereum/wiki/Management-APIs#personal_sign
-func (s *PrivateAccountAPI) Sign(ctx context.Context, message string, addr common.Address, passwd string) (string, error) {
+func (s *PrivateAccountAPI) Sign(ctx context.Context, data hexutil.Bytes, addr common.Address, passwd string) (hexutil.Bytes, error) {
-	hash := signHash(message)
+	return s.b.AccountManager().SignWithPassphrase(addr, passwd, signHash(data))
-	signature, err := s.b.AccountManager().SignWithPassphrase(addr, passwd, hash)
-	if err != nil {
-		return "0x", err
-	}
-	return common.ToHex(signature), nil
 }
 
 // EcRecover returns the address for the account that was used to create the signature.
@@ -322,29 +318,20 @@ func (s *PrivateAccountAPI) Sign(ctx context.Context, message string, addr commo
 // addr = ecrecover(hash, signature)
 //
 // https://github.com/ethereum/go-ethereum/wiki/Management-APIs#personal_ecRecover
-func (s *PrivateAccountAPI) EcRecover(ctx context.Context, message string, signature string) (common.Address, error) {
+func (s *PrivateAccountAPI) EcRecover(ctx context.Context, data, sig hexutil.Bytes) (common.Address, error) {
-	var (
-		hash = signHash(message)
-		sig  = common.FromHex(signature)
-	)
-
 	if len(sig) != 65 {
 		return common.Address{}, fmt.Errorf("signature must be 65 bytes long")
 	}
-
 	// see crypto.Ecrecover description
 	if sig[64] == 27 || sig[64] == 28 {
 		sig[64] -= 27
 	}
-
+	rpk, err := crypto.Ecrecover(signHash(data), sig)
-	rpk, err := crypto.Ecrecover(hash, sig)
 	if err != nil {
 		return common.Address{}, err
 	}
-
 	pubKey := crypto.ToECDSAPub(rpk)
 	recoveredAddr := crypto.PubkeyToAddress(*pubKey)
-
 	return recoveredAddr, nil
 }
 
@@ -1116,10 +1103,8 @@ func (s *PublicTransactionPoolAPI) SendRawTransaction(ctx context.Context, encod
 // The account associated with addr must be unlocked.
 //
 // https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign
-func (s *PublicTransactionPoolAPI) Sign(addr common.Address, message string) (string, error) {
+func (s *PublicTransactionPoolAPI) Sign(addr common.Address, data hexutil.Bytes) (hexutil.Bytes, error) {
-	hash := signHash(message)
+	return s.b.AccountManager().SignEthereum(addr, signHash(data))
-	signature, err := s.b.AccountManager().SignEthereum(addr, hash)
-	return common.ToHex(signature), err
 }
 
 // SignTransactionArgs represents the arguments to sign a transaction.
@@ -1273,8 +1258,12 @@ func (s *PublicTransactionPoolAPI) SignTransaction(ctx context.Context, args Sig
 
 // PendingTransactions returns the transactions that are in the transaction pool and have a from address that is one of
 // the accounts this node manages.
-func (s *PublicTransactionPoolAPI) PendingTransactions() []*RPCTransaction {
+func (s *PublicTransactionPoolAPI) PendingTransactions() ([]*RPCTransaction, error) {
-	pending := s.b.GetPoolTransactions()
+	pending, err := s.b.GetPoolTransactions()
+	if err != nil {
+		return nil, err
+	}
+
 	transactions := make([]*RPCTransaction, 0, len(pending))
 	for _, tx := range pending {
 		var signer types.Signer = types.HomesteadSigner{}
@@ -1286,13 +1275,17 @@ func (s *PublicTransactionPoolAPI) PendingTransactions() []*RPCTransaction {
 			transactions = append(transactions, newRPCPendingTransaction(tx))
 		}
 	}
-	return transactions
+	return transactions, nil
 }
 
 // Resend accepts an existing transaction and a new gas price and limit. It will remove the given transaction from the
 // pool and reinsert it with the new gas price and limit.
 func (s *PublicTransactionPoolAPI) Resend(ctx context.Context, tx Tx, gasPrice, gasLimit *rpc.HexNumber) (common.Hash, error) {
-	pending := s.b.GetPoolTransactions()
+	pending, err := s.b.GetPoolTransactions()
+	if err != nil {
+		return common.Hash{}, err
+	}
+
 	for _, p := range pending {
 		var signer types.Signer = types.HomesteadSigner{}
 		if p.Protected() {

internal/ethapi/backend.go

@@ -55,7 +55,7 @@ type Backend interface {
 	// TxPool API
 	SendTx(ctx context.Context, signedTx *types.Transaction) error
 	RemoveTx(txHash common.Hash)
-	GetPoolTransactions() types.Transactions
+	GetPoolTransactions() (types.Transactions, error)
 	GetPoolTransaction(txHash common.Hash) *types.Transaction
 	GetPoolNonce(ctx context.Context, addr common.Address) (uint64, error)
 	Stats() (pending int, queued int)

les/api_backend.go

@@ -110,7 +110,7 @@ func (b *LesApiBackend) RemoveTx(txHash common.Hash) {
 	b.eth.txPool.RemoveTx(txHash)
 }
 
-func (b *LesApiBackend) GetPoolTransactions() types.Transactions {
+func (b *LesApiBackend) GetPoolTransactions() (types.Transactions, error) {
 	return b.eth.txPool.GetTransactions()
 }
 

les/fetcher.go

@@ -23,135 +23,374 @@ import (
 	"time"
 
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/mclock"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/light"
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/logger/glog"
 )
 
+const (
+	blockDelayTimeout = time.Second * 10 // timeout for a peer to announce a head that has already been confirmed by others
+	maxNodeCount      = 20               // maximum number of fetcherTreeNode entries remembered for each peer
+)
+
+// lightFetcher
 type lightFetcher struct {
 	pm    *ProtocolManager
 	odr   *LesOdr
-	chain BlockChain
+	chain *light.LightChain
 
-	headAnnouncedMu sync.Mutex
+	maxConfirmedTd  *big.Int
-	headAnnouncedBy map[common.Hash][]*peer
+	peers           map[*peer]*fetcherPeerInfo
-	currentTd       *big.Int
+	lastUpdateStats *updateStatsEntry
-	deliverChn      chan fetchResponse
+
-	reqMu           sync.RWMutex
+	lock       sync.Mutex // qwerqwerqwe
-	requested       map[uint64]fetchRequest
+	deliverChn chan fetchResponse
-	timeoutChn      chan uint64
+	reqMu      sync.RWMutex
-	notifyChn       chan bool // true if initiated from outside
+	requested  map[uint64]fetchRequest
-	syncing         bool
+	timeoutChn chan uint64
-	syncDone        chan struct{}
+	requestChn chan bool // true if initiated from outside
+	syncing    bool
+	syncDone   chan *peer
 }
 
+// fetcherPeerInfo holds fetcher-specific information about each active peer
+type fetcherPeerInfo struct {
+	root, lastAnnounced *fetcherTreeNode
+	nodeCnt             int
+	confirmedTd         *big.Int
+	bestConfirmed       *fetcherTreeNode
+	nodeByHash          map[common.Hash]*fetcherTreeNode
+	firstUpdateStats    *updateStatsEntry
+}
+
+// fetcherTreeNode is a node of a tree that holds information about blocks recently
+// announced and confirmed by a certain peer. Each new announce message from a peer
+// adds nodes to the tree, based on the previous announced head and the reorg depth.
+// There are three possible states for a tree node:
+// - announced: not downloaded (known) yet, but we know its head, number and td
+// - intermediate: not known, hash and td are empty, they are filled out when it becomes known
+// - known: both announced by this peer and downloaded (from any peer).
+// This structure makes it possible to always know which peer has a certain block,
+// which is necessary for selecting a suitable peer for ODR requests and also for
+// canonizing new heads. It also helps to always download the minimum necessary
+// amount of headers with a single request.
+type fetcherTreeNode struct {
+	hash             common.Hash
+	number           uint64
+	td               *big.Int
+	known, requested bool
+	parent           *fetcherTreeNode
+	children         []*fetcherTreeNode
+}
+
+// fetchRequest represents a header download request
 type fetchRequest struct {
-	hash   common.Hash
+	hash    common.Hash
-	amount uint64
+	amount  uint64
-	peer   *peer
+	peer    *peer
+	sent    mclock.AbsTime
+	timeout bool
 }
 
+// fetchResponse represents a header download response
 type fetchResponse struct {
 	reqID   uint64
 	headers []*types.Header
+	peer    *peer
 }
 
+// newLightFetcher creates a new light fetcher
 func newLightFetcher(pm *ProtocolManager) *lightFetcher {
 	f := &lightFetcher{
-		pm:              pm,
+		pm:             pm,
-		chain:           pm.blockchain,
+		chain:          pm.blockchain.(*light.LightChain),
-		odr:             pm.odr,
+		odr:            pm.odr,
-		headAnnouncedBy: make(map[common.Hash][]*peer),
+		peers:          make(map[*peer]*fetcherPeerInfo),
-		deliverChn:      make(chan fetchResponse, 100),
+		deliverChn:     make(chan fetchResponse, 100),
-		requested:       make(map[uint64]fetchRequest),
+		requested:      make(map[uint64]fetchRequest),
-		timeoutChn:      make(chan uint64),
+		timeoutChn:     make(chan uint64),
-		notifyChn:       make(chan bool, 100),
+		requestChn:     make(chan bool, 100),
-		syncDone:        make(chan struct{}),
+		syncDone:       make(chan *peer),
-		currentTd:       big.NewInt(0),
+		maxConfirmedTd: big.NewInt(0),
 	}
 	go f.syncLoop()
 	return f
 }
 
-func (f *lightFetcher) notify(p *peer, head *announceData) {
+// syncLoop is the main event loop of the light fetcher
-	var headHash common.Hash
+func (f *lightFetcher) syncLoop() {
-	if head == nil {
+	f.pm.wg.Add(1)
-		// initial notify
+	defer f.pm.wg.Done()
-		headHash = p.Head()
+
-	} else {
+	requestStarted := false
-		if core.GetTd(f.pm.chainDb, head.Hash, head.Number) != nil {
+	for {
-			head.haveHeaders = head.Number
+		select {
+		case <-f.pm.quitSync:
+			return
+		// when a new announce is received, request loop keeps running until
+		// no further requests are necessary or possible
+		case newAnnounce := <-f.requestChn:
+			f.lock.Lock()
+			s := requestStarted
+			requestStarted = false
+			if !f.syncing && !(newAnnounce && s) {
+				if peer, node, amount := f.nextRequest(); node != nil {
+					requestStarted = true
+					reqID, started := f.request(peer, node, amount)
+					if started {
+						go func() {
+							time.Sleep(softRequestTimeout)
+							f.reqMu.Lock()
+							req, ok := f.requested[reqID]
+							if ok {
+								req.timeout = true
+								f.requested[reqID] = req
+							}
+							f.reqMu.Unlock()
+							// keep starting new requests while possible
+							f.requestChn <- false
+						}()
+					}
+				}
+			}
+			f.lock.Unlock()
+		case reqID := <-f.timeoutChn:
+			f.reqMu.Lock()
+			req, ok := f.requested[reqID]
+			if ok {
+				delete(f.requested, reqID)
+			}
+			f.reqMu.Unlock()
+			if ok {
+				f.pm.serverPool.adjustResponseTime(req.peer.poolEntry, time.Duration(mclock.Now()-req.sent), true)
+				glog.V(logger.Debug).Infof("hard timeout by peer %v", req.peer.id)
+				go f.pm.removePeer(req.peer.id)
+			}
+		case resp := <-f.deliverChn:
+			f.reqMu.Lock()
+			req, ok := f.requested[resp.reqID]
+			if ok && req.peer != resp.peer {
+				ok = false
+			}
+			if ok {
+				delete(f.requested, resp.reqID)
+			}
+			f.reqMu.Unlock()
+			if ok {
+				f.pm.serverPool.adjustResponseTime(req.peer.poolEntry, time.Duration(mclock.Now()-req.sent), req.timeout)
+			}
+			f.lock.Lock()
+			if !ok || !(f.syncing || f.processResponse(req, resp)) {
+				glog.V(logger.Debug).Infof("failed processing response by peer %v", resp.peer.id)
+				go f.pm.removePeer(resp.peer.id)
+			}
+			f.lock.Unlock()
+		case p := <-f.syncDone:
+			f.lock.Lock()
+			glog.V(logger.Debug).Infof("done synchronising with peer %v", p.id)
+			f.checkSyncedHeaders(p)
+			f.syncing = false
+			f.lock.Unlock()
 		}
-		//fmt.Println("notify", p.id, head.Number, head.ReorgDepth, head.haveHeaders)
-		if !p.addNotify(head) {
-			//fmt.Println("addNotify fail")
-			f.pm.removePeer(p.id)
-		}
-		headHash = head.Hash
 	}
-	f.headAnnouncedMu.Lock()
-	f.headAnnouncedBy[headHash] = append(f.headAnnouncedBy[headHash], p)
-	f.headAnnouncedMu.Unlock()
-	f.notifyChn <- true
 }
 
-func (f *lightFetcher) gotHeader(header *types.Header) {
+// addPeer adds a new peer to the fetcher's peer set
-	f.headAnnouncedMu.Lock()
+func (f *lightFetcher) addPeer(p *peer) {
-	defer f.headAnnouncedMu.Unlock()
+	p.lock.Lock()
+	p.hasBlock = func(hash common.Hash, number uint64) bool {
+		return f.peerHasBlock(p, hash, number)
+	}
+	p.lock.Unlock()
 
-	hash := header.Hash()
+	f.lock.Lock()
-	peerList := f.headAnnouncedBy[hash]
+	defer f.lock.Unlock()
-	if peerList == nil {
+
+	f.peers[p] = &fetcherPeerInfo{nodeByHash: make(map[common.Hash]*fetcherTreeNode)}
+}
+
+// removePeer removes a new peer from the fetcher's peer set
+func (f *lightFetcher) removePeer(p *peer) {
+	p.lock.Lock()
+	p.hasBlock = nil
+	p.lock.Unlock()
+
+	f.lock.Lock()
+	defer f.lock.Unlock()
+
+	// check for potential timed out block delay statistics
+	f.checkUpdateStats(p, nil)
+	delete(f.peers, p)
+}
+
+// announce processes a new announcement message received from a peer, adding new
+// nodes to the peer's block tree and removing old nodes if necessary
+func (f *lightFetcher) announce(p *peer, head *announceData) {
+	f.lock.Lock()
+	defer f.lock.Unlock()
+	glog.V(logger.Debug).Infof("received announce from peer %v  #%d  %016x  reorg: %d", p.id, head.Number, head.Hash[:8], head.ReorgDepth)
+
+	fp := f.peers[p]
+	if fp == nil {
+		glog.V(logger.Debug).Infof("announce: unknown peer")
 		return
 	}
-	number := header.Number.Uint64()
-	td := core.GetTd(f.pm.chainDb, hash, number)
-	for _, peer := range peerList {
-		peer.lock.Lock()
-		ok := peer.gotHeader(hash, number, td)
-		peer.lock.Unlock()
-		if !ok {
-			//fmt.Println("gotHeader fail")
-			f.pm.removePeer(peer.id)
-		}
-	}
-	delete(f.headAnnouncedBy, hash)
-}
 
-func (f *lightFetcher) nextRequest() (*peer, *announceData) {
+	if fp.lastAnnounced != nil && head.Td.Cmp(fp.lastAnnounced.td) <= 0 {
-	var bestPeer *peer
+		// announced tds should be strictly monotonic
-	bestTd := f.currentTd
+		glog.V(logger.Debug).Infof("non-monotonic Td from peer %v", p.id)
-	for _, peer := range f.pm.peers.AllPeers() {
+		go f.pm.removePeer(p.id)
-		peer.lock.RLock()
+		return
-		if !peer.headInfo.requested && (peer.headInfo.Td.Cmp(bestTd) > 0 ||
+	}
-			(bestPeer != nil && peer.headInfo.Td.Cmp(bestTd) == 0 && peer.headInfo.haveHeaders > bestPeer.headInfo.haveHeaders)) {
+
-			bestPeer = peer
+	n := fp.lastAnnounced
-			bestTd = peer.headInfo.Td
+	for i := uint64(0); i < head.ReorgDepth; i++ {
+		if n == nil {
+			break
 		}
-		peer.lock.RUnlock()
+		n = n.parent
 	}
-	if bestPeer == nil {
+	if n != nil {
-		return nil, nil
+		// n is now the reorg common ancestor, add a new branch of nodes
-	}
+		// check if the node count is too high to add new nodes
-	bestPeer.lock.Lock()
+		locked := false
-	res := bestPeer.headInfo
+		for uint64(fp.nodeCnt)+head.Number-n.number > maxNodeCount && fp.root != nil {
-	res.requested = true
+			if !locked {
-	bestPeer.lock.Unlock()
+				f.chain.LockChain()
-	for _, peer := range f.pm.peers.AllPeers() {
+				defer f.chain.UnlockChain()
-		if peer != bestPeer {
+				locked = true
-			peer.lock.Lock()
-			if peer.headInfo.Hash == bestPeer.headInfo.Hash && peer.headInfo.haveHeaders == bestPeer.headInfo.haveHeaders {
-				peer.headInfo.requested = true
 			}
-			peer.lock.Unlock()
+			// if one of root's children is canonical, keep it, delete other branches and root itself
+			var newRoot *fetcherTreeNode
+			for i, nn := range fp.root.children {
+				if core.GetCanonicalHash(f.pm.chainDb, nn.number) == nn.hash {
+					fp.root.children = append(fp.root.children[:i], fp.root.children[i+1:]...)
+					nn.parent = nil
+					newRoot = nn
+					break
+				}
+			}
+			fp.deleteNode(fp.root)
+			if n == fp.root {
+				n = newRoot
+			}
+			fp.root = newRoot
+			if newRoot == nil || !f.checkKnownNode(p, newRoot) {
+				fp.bestConfirmed = nil
+				fp.confirmedTd = nil
+			}
+
+			if n == nil {
+				break
+			}
+		}
+		if n != nil {
+			for n.number < head.Number {
+				nn := &fetcherTreeNode{number: n.number + 1, parent: n}
+				n.children = append(n.children, nn)
+				n = nn
+				fp.nodeCnt++
+			}
+			n.hash = head.Hash
+			n.td = head.Td
+			fp.nodeByHash[n.hash] = n
 		}
 	}
-	return bestPeer, res
+	if n == nil {
+		// could not find reorg common ancestor or had to delete entire tree, a new root and a resync is needed
+		if fp.root != nil {
+			fp.deleteNode(fp.root)
+		}
+		n = &fetcherTreeNode{hash: head.Hash, number: head.Number, td: head.Td}
+		fp.root = n
+		fp.nodeCnt++
+		fp.nodeByHash[n.hash] = n
+		fp.bestConfirmed = nil
+		fp.confirmedTd = nil
+	}
+
+	f.checkKnownNode(p, n)
+	p.lock.Lock()
+	p.headInfo = head
+	fp.lastAnnounced = n
+	p.lock.Unlock()
+	f.checkUpdateStats(p, nil)
+	f.requestChn <- true
 }
 
-func (f *lightFetcher) deliverHeaders(reqID uint64, headers []*types.Header) {
+// peerHasBlock returns true if we can assume the peer knows the given block
-	f.deliverChn <- fetchResponse{reqID: reqID, headers: headers}
+// based on its announcements
+func (f *lightFetcher) peerHasBlock(p *peer, hash common.Hash, number uint64) bool {
+	f.lock.Lock()
+	defer f.lock.Unlock()
+
+	fp := f.peers[p]
+	if fp == nil || fp.root == nil {
+		return false
+	}
+
+	if number >= fp.root.number {
+		// it is recent enough that if it is known, is should be in the peer's block tree
+		return fp.nodeByHash[hash] != nil
+	}
+	f.chain.LockChain()
+	defer f.chain.UnlockChain()
+	// if it's older than the peer's block tree root but it's in the same canonical chain
+	// than the root, we can still be sure the peer knows it
+	return core.GetCanonicalHash(f.pm.chainDb, fp.root.number) == fp.root.hash && core.GetCanonicalHash(f.pm.chainDb, number) == hash
 }
 
+// request initiates a header download request from a certain peer
+func (f *lightFetcher) request(p *peer, n *fetcherTreeNode, amount uint64) (uint64, bool) {
+	fp := f.peers[p]
+	if fp == nil {
+		glog.V(logger.Debug).Infof("request: unknown peer")
+		return 0, false
+	}
+	if fp.bestConfirmed == nil || fp.root == nil || !f.checkKnownNode(p, fp.root) {
+		f.syncing = true
+		go func() {
+			glog.V(logger.Debug).Infof("synchronising with peer %v", p.id)
+			f.pm.synchronise(p)
+			f.syncDone <- p
+		}()
+		return 0, false
+	}
+
+	reqID := getNextReqID()
+	n.requested = true
+	cost := p.GetRequestCost(GetBlockHeadersMsg, int(amount))
+	p.fcServer.SendRequest(reqID, cost)
+	f.reqMu.Lock()
+	f.requested[reqID] = fetchRequest{hash: n.hash, amount: amount, peer: p, sent: mclock.Now()}
+	f.reqMu.Unlock()
+	go p.RequestHeadersByHash(reqID, cost, n.hash, int(amount), 0, true)
+	go func() {
+		time.Sleep(hardRequestTimeout)
+		f.timeoutChn <- reqID
+	}()
+	return reqID, true
+}
+
+// requestAmount calculates the amount of headers to be downloaded starting
+// from a certain head backwards
+func (f *lightFetcher) requestAmount(p *peer, n *fetcherTreeNode) uint64 {
+	amount := uint64(0)
+	nn := n
+	for nn != nil && !f.checkKnownNode(p, nn) {
+		nn = nn.parent
+		amount++
+	}
+	if nn == nil {
+		amount = n.number
+	}
+	return amount
+}
+
+// requestedID tells if a certain reqID has been requested by the fetcher
 func (f *lightFetcher) requestedID(reqID uint64) bool {
 	f.reqMu.RLock()
 	_, ok := f.requested[reqID]
@@ -159,36 +398,51 @@ func (f *lightFetcher) requestedID(reqID uint64) bool {
 	return ok
 }
 
-func (f *lightFetcher) request(p *peer, block *announceData) {
+// nextRequest selects the peer and announced head to be requested next, amount
-	//fmt.Println("request", p.id, block.Number, block.haveHeaders)
+// to be downloaded starting from the head backwards is also returned
-	amount := block.Number - block.haveHeaders
+func (f *lightFetcher) nextRequest() (*peer, *fetcherTreeNode, uint64) {
-	if amount == 0 {
+	var (
-		return
+		bestHash   common.Hash
+		bestAmount uint64
+	)
+	bestTd := f.maxConfirmedTd
+
+	for p, fp := range f.peers {
+		for hash, n := range fp.nodeByHash {
+			if !f.checkKnownNode(p, n) && !n.requested && (bestTd == nil || n.td.Cmp(bestTd) >= 0) {
+				amount := f.requestAmount(p, n)
+				if bestTd == nil || n.td.Cmp(bestTd) > 0 || amount < bestAmount {
+					bestHash = hash
+					bestAmount = amount
+					bestTd = n.td
+				}
+			}
+		}
 	}
-	if amount > 100 {
+	if bestTd == f.maxConfirmedTd {
-		f.syncing = true
+		return nil, nil, 0
-		go func() {
-			//fmt.Println("f.pm.synchronise(p)")
-			f.pm.synchronise(p)
-			//fmt.Println("sync done")
-			f.syncDone <- struct{}{}
-		}()
-		return
 	}
 
-	reqID := f.odr.getNextReqID()
+	peer := f.pm.serverPool.selectPeer(func(p *peer) (bool, uint64) {
-	f.reqMu.Lock()
+		fp := f.peers[p]
-	f.requested[reqID] = fetchRequest{hash: block.Hash, amount: amount, peer: p}
+		if fp == nil || fp.nodeByHash[bestHash] == nil {
-	f.reqMu.Unlock()
+			return false, 0
-	cost := p.GetRequestCost(GetBlockHeadersMsg, int(amount))
+		}
-	p.fcServer.SendRequest(reqID, cost)
+		return true, p.fcServer.CanSend(p.GetRequestCost(GetBlockHeadersMsg, int(bestAmount)))
-	go p.RequestHeadersByHash(reqID, cost, block.Hash, int(amount), 0, true)
+	})
-	go func() {
+	var node *fetcherTreeNode
-		time.Sleep(hardRequestTimeout)
+	if peer != nil {
-		f.timeoutChn <- reqID
+		node = f.peers[peer].nodeByHash[bestHash]
-	}()
+	}
+	return peer, node, bestAmount
 }
 
+// deliverHeaders delivers header download request responses for processing
+func (f *lightFetcher) deliverHeaders(peer *peer, reqID uint64, headers []*types.Header) {
+	f.deliverChn <- fetchResponse{reqID: reqID, headers: headers, peer: peer}
+}
+
+// processResponse processes header download request responses
 func (f *lightFetcher) processResponse(req fetchRequest, resp fetchResponse) bool {
 	if uint64(len(resp.headers)) != req.amount || resp.headers[0].Hash() != req.hash {
 		return false
@@ -200,96 +454,248 @@ func (f *lightFetcher) processResponse(req fetchRequest, resp fetchResponse) boo
 	if _, err := f.chain.InsertHeaderChain(headers, 1); err != nil {
 		return false
 	}
-	for _, header := range headers {
+	tds := make([]*big.Int, len(headers))
-		td := core.GetTd(f.pm.chainDb, header.Hash(), header.Number.Uint64())
+	for i, header := range headers {
+		td := f.chain.GetTd(header.Hash(), header.Number.Uint64())
 		if td == nil {
 			return false
 		}
-		if td.Cmp(f.currentTd) > 0 {
+		tds[i] = td
-			f.currentTd = td
-		}
-		f.gotHeader(header)
 	}
+	f.newHeaders(headers, tds)
 	return true
 }
 
-func (f *lightFetcher) checkSyncedHeaders() {
+// newHeaders updates the block trees of all active peers according to a newly
-	//fmt.Println("checkSyncedHeaders()")
+// downloaded and validated batch or headers
-	for _, peer := range f.pm.peers.AllPeers() {
+func (f *lightFetcher) newHeaders(headers []*types.Header, tds []*big.Int) {
-		peer.lock.Lock()
+	var maxTd *big.Int
-		h := peer.firstHeadInfo
+	for p, fp := range f.peers {
-		remove := false
+		if !f.checkAnnouncedHeaders(fp, headers, tds) {
-	loop:
+			glog.V(logger.Debug).Infof("announce inconsistency by peer %v", p.id)
-		for h != nil {
+			go f.pm.removePeer(p.id)
-			if td := core.GetTd(f.pm.chainDb, h.Hash, h.Number); td != nil {
+		}
-				//fmt.Println(" found", h.Number)
+		if fp.confirmedTd != nil && (maxTd == nil || maxTd.Cmp(fp.confirmedTd) > 0) {
-				ok := peer.gotHeader(h.Hash, h.Number, td)
+			maxTd = fp.confirmedTd
-				if !ok {
+		}
-					remove = true
+	}
-					break loop
+	if maxTd != nil {
-				}
+		f.updateMaxConfirmedTd(maxTd)
-				if td.Cmp(f.currentTd) > 0 {
+	}
-					f.currentTd = td
+}
+
+// checkAnnouncedHeaders updates peer's block tree if necessary after validating
+// a batch of headers. It searches for the latest header in the batch that has a
+// matching tree node (if any), and if it has not been marked as known already,
+// sets it and its parents to known (even those which are older than the currently
+// validated ones). Return value shows if all hashes, numbers and Tds matched
+// correctly to the announced values (otherwise the peer should be dropped).
+func (f *lightFetcher) checkAnnouncedHeaders(fp *fetcherPeerInfo, headers []*types.Header, tds []*big.Int) bool {
+	var (
+		n      *fetcherTreeNode
+		header *types.Header
+		td     *big.Int
+	)
+
+	for i := len(headers) - 1; ; i-- {
+		if i < 0 {
+			if n == nil {
+				// no more headers and nothing to match
+				return true
+			}
+			// we ran out of recently delivered headers but have not reached a node known by this peer yet, continue matching
+			td = f.chain.GetTd(header.ParentHash, header.Number.Uint64()-1)
+			header = f.chain.GetHeader(header.ParentHash, header.Number.Uint64()-1)
+		} else {
+			header = headers[i]
+			td = tds[i]
+		}
+		hash := header.Hash()
+		number := header.Number.Uint64()
+		if n == nil {
+			n = fp.nodeByHash[hash]
+		}
+		if n != nil {
+			if n.td == nil {
+				// node was unannounced
+				if nn := fp.nodeByHash[hash]; nn != nil {
+					// if there was already a node with the same hash, continue there and drop this one
+					nn.children = append(nn.children, n.children...)
+					n.children = nil
+					fp.deleteNode(n)
+					n = nn
+				} else {
+					n.hash = hash
+					n.td = td
+					fp.nodeByHash[hash] = n
 				}
 			}
-			h = h.next
+			// check if it matches the header
-		}
+			if n.hash != hash || n.number != number || n.td.Cmp(td) != 0 {
-		peer.lock.Unlock()
+				// peer has previously made an invalid announcement
-		if remove {
+				return false
-			//fmt.Println("checkSync fail")
+			}
-			f.pm.removePeer(peer.id)
+			if n.known {
+				// we reached a known node that matched our expectations, return with success
+				return true
+			}
+			n.known = true
+			if fp.confirmedTd == nil || td.Cmp(fp.confirmedTd) > 0 {
+				fp.confirmedTd = td
+				fp.bestConfirmed = n
+			}
+			n = n.parent
+			if n == nil {
+				return true
+			}
 		}
 	}
 }
 
-func (f *lightFetcher) syncLoop() {
+// checkSyncedHeaders updates peer's block tree after synchronisation by marking
-	f.pm.wg.Add(1)
+// downloaded headers as known. If none of the announced headers are found after
-	defer f.pm.wg.Done()
+// syncing, the peer is dropped.
+func (f *lightFetcher) checkSyncedHeaders(p *peer) {
+	fp := f.peers[p]
+	if fp == nil {
+		glog.V(logger.Debug).Infof("checkSyncedHeaders: unknown peer")
+		return
+	}
+	n := fp.lastAnnounced
+	var td *big.Int
+	for n != nil {
+		if td = f.chain.GetTd(n.hash, n.number); td != nil {
+			break
+		}
+		n = n.parent
+	}
+	// now n is the latest downloaded header after syncing
+	if n == nil {
+		glog.V(logger.Debug).Infof("synchronisation failed with peer %v", p.id)
+		go f.pm.removePeer(p.id)
+	} else {
+		header := f.chain.GetHeader(n.hash, n.number)
+		f.newHeaders([]*types.Header{header}, []*big.Int{td})
+	}
+}
 
-	srtoNotify := false
+// checkKnownNode checks if a block tree node is known (downloaded and validated)
+// If it was not known previously but found in the database, sets its known flag
+func (f *lightFetcher) checkKnownNode(p *peer, n *fetcherTreeNode) bool {
+	if n.known {
+		return true
+	}
+	td := f.chain.GetTd(n.hash, n.number)
+	if td == nil {
+		return false
+	}
+
+	fp := f.peers[p]
+	if fp == nil {
+		glog.V(logger.Debug).Infof("checkKnownNode: unknown peer")
+		return false
+	}
+	header := f.chain.GetHeader(n.hash, n.number)
+	if !f.checkAnnouncedHeaders(fp, []*types.Header{header}, []*big.Int{td}) {
+		glog.V(logger.Debug).Infof("announce inconsistency by peer %v", p.id)
+		go f.pm.removePeer(p.id)
+	}
+	if fp.confirmedTd != nil {
+		f.updateMaxConfirmedTd(fp.confirmedTd)
+	}
+	return n.known
+}
+
+// deleteNode deletes a node and its child subtrees from a peer's block tree
+func (fp *fetcherPeerInfo) deleteNode(n *fetcherTreeNode) {
+	if n.parent != nil {
+		for i, nn := range n.parent.children {
+			if nn == n {
+				n.parent.children = append(n.parent.children[:i], n.parent.children[i+1:]...)
+				break
+			}
+		}
+	}
 	for {
-		select {
+		if n.td != nil {
-		case <-f.pm.quitSync:
+			delete(fp.nodeByHash, n.hash)
+		}
+		fp.nodeCnt--
+		if len(n.children) == 0 {
 			return
-		case ext := <-f.notifyChn:
+		}
-			//fmt.Println("<-f.notifyChn", f.syncing, ext, srtoNotify)
+		for i, nn := range n.children {
-			s := srtoNotify
+			if i == 0 {
-			srtoNotify = false
+				n = nn
-			if !f.syncing && !(ext && s) {
+			} else {
-				if p, r := f.nextRequest(); r != nil {
+				fp.deleteNode(nn)
-					srtoNotify = true
-					go func() {
-						time.Sleep(softRequestTimeout)
-						f.notifyChn <- false
-					}()
-					f.request(p, r)
-				}
 			}
-		case reqID := <-f.timeoutChn:
+		}
-			f.reqMu.Lock()
+	}
-			req, ok := f.requested[reqID]
+}
-			if ok {
+
-				delete(f.requested, reqID)
+// updateStatsEntry items form a linked list that is expanded with a new item every time a new head with a higher Td
-			}
+// than the previous one has been downloaded and validated. The list contains a series of maximum confirmed Td values
-			f.reqMu.Unlock()
+// and the time these values have been confirmed, both increasing monotonically. A maximum confirmed Td is calculated
-			if ok {
+// both globally for all peers and also for each individual peer (meaning that the given peer has announced the head
-				//fmt.Println("hard timeout")
+// and it has also been downloaded from any peer, either before or after the given announcement).
-				f.pm.removePeer(req.peer.id)
+// The linked list has a global tail where new confirmed Td entries are added and a separate head for each peer,
-			}
+// pointing to the next Td entry that is higher than the peer's max confirmed Td (nil if it has already confirmed
-		case resp := <-f.deliverChn:
+// the current global head).
-			//fmt.Println("<-f.deliverChn", f.syncing)
+type updateStatsEntry struct {
-			f.reqMu.Lock()
+	time mclock.AbsTime
-			req, ok := f.requested[resp.reqID]
+	td   *big.Int
-			delete(f.requested, resp.reqID)
+	next *updateStatsEntry
-			f.reqMu.Unlock()
+}
-			if !ok || !(f.syncing || f.processResponse(req, resp)) {
+
-				//fmt.Println("processResponse fail")
+// updateMaxConfirmedTd updates the block delay statistics of active peers. Whenever a new highest Td is confirmed,
-				f.pm.removePeer(req.peer.id)
+// adds it to the end of a linked list together with the time it has been confirmed. Then checks which peers have
-			}
+// already confirmed a head with the same or higher Td (which counts as zero block delay) and updates their statistics.
-		case <-f.syncDone:
+// Those who have not confirmed such a head by now will be updated by a subsequent checkUpdateStats call with a
-			//fmt.Println("<-f.syncDone", f.syncing)
+// positive block delay value.
-			f.checkSyncedHeaders()
+func (f *lightFetcher) updateMaxConfirmedTd(td *big.Int) {
-			f.syncing = false
+	if f.maxConfirmedTd == nil || td.Cmp(f.maxConfirmedTd) > 0 {
+		f.maxConfirmedTd = td
+		newEntry := &updateStatsEntry{
+			time: mclock.Now(),
+			td:   td,
+		}
+		if f.lastUpdateStats != nil {
+			f.lastUpdateStats.next = newEntry
+		}
+		f.lastUpdateStats = newEntry
+		for p, _ := range f.peers {
+			f.checkUpdateStats(p, newEntry)
+		}
+	}
+}
+
+// checkUpdateStats checks those peers who have not confirmed a certain highest Td (or a larger one) by the time it
+// has been confirmed by another peer. If they have confirmed such a head by now, their stats are updated with the
+// block delay which is (this peer's confirmation time)-(first confirmation time). After blockDelayTimeout has passed,
+// the stats are updated with blockDelayTimeout value. In either case, the confirmed or timed out updateStatsEntry
+// items are removed from the head of the linked list.
+// If a new entry has been added to the global tail, it is passed as a parameter here even though this function
+// assumes that it has already been added, so that if the peer's list is empty (all heads confirmed, head is nil),
+// it can set the new head to newEntry.
+func (f *lightFetcher) checkUpdateStats(p *peer, newEntry *updateStatsEntry) {
+	now := mclock.Now()
+	fp := f.peers[p]
+	if fp == nil {
+		glog.V(logger.Debug).Infof("checkUpdateStats: unknown peer")
+		return
+	}
+	if newEntry != nil && fp.firstUpdateStats == nil {
+		fp.firstUpdateStats = newEntry
+	}
+	for fp.firstUpdateStats != nil && fp.firstUpdateStats.time <= now-mclock.AbsTime(blockDelayTimeout) {
+		f.pm.serverPool.adjustBlockDelay(p.poolEntry, blockDelayTimeout)
+		fp.firstUpdateStats = fp.firstUpdateStats.next
+	}
+	if fp.confirmedTd != nil {
+		for fp.firstUpdateStats != nil && fp.firstUpdateStats.td.Cmp(fp.confirmedTd) <= 0 {
+			f.pm.serverPool.adjustBlockDelay(p.poolEntry, time.Duration(now-fp.firstUpdateStats.time))
+			fp.firstUpdateStats = fp.firstUpdateStats.next
 		}
 	}
 }

les/handler.go

@@ -22,8 +22,8 @@ import (
 	"errors"
 	"fmt"
 	"math/big"
+	"net"
 	"sync"
-	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
@@ -58,7 +58,7 @@ const (
 	MaxHeaderProofsFetch = 64  // Amount of merkle proofs to be fetched per retrieval request
 	MaxTxSend            = 64  // Amount of transactions to be send per request
 
-	disableClientRemovePeer = true
+	disableClientRemovePeer = false
 )
 
 // errIncompatibleConfig is returned if the requested protocols and configs are
@@ -88,7 +88,7 @@ type BlockChain interface {
 
 type txPool interface {
 	// AddTransactions should add the given transactions to the pool.
-	AddBatch([]*types.Transaction)
+	AddBatch([]*types.Transaction) error
 }
 
 type ProtocolManager struct {
@@ -101,10 +101,7 @@ type ProtocolManager struct {
 	chainDb     ethdb.Database
 	odr         *LesOdr
 	server      *LesServer
-
+	serverPool  *serverPool
-	topicDisc *discv5.Network
-	lesTopic  discv5.Topic
-	p2pServer *p2p.Server
 
 	downloader *downloader.Downloader
 	fetcher    *lightFetcher
@@ -157,13 +154,29 @@ func NewProtocolManager(chainConfig *params.ChainConfig, lightSync bool, network
 			Version: version,
 			Length:  ProtocolLengths[i],
 			Run: func(p *p2p.Peer, rw p2p.MsgReadWriter) error {
+				var entry *poolEntry
 				peer := manager.newPeer(int(version), networkId, p, rw)
+				if manager.serverPool != nil {
+					addr := p.RemoteAddr().(*net.TCPAddr)
+					entry = manager.serverPool.connect(peer, addr.IP, uint16(addr.Port))
+					if entry == nil {
+						return fmt.Errorf("unwanted connection")
+					}
+				}
+				peer.poolEntry = entry
 				select {
 				case manager.newPeerCh <- peer:
 					manager.wg.Add(1)
 					defer manager.wg.Done()
-					return manager.handle(peer)
+					err := manager.handle(peer)
+					if entry != nil {
+						manager.serverPool.disconnect(entry)
+					}
+					return err
 				case <-manager.quitSync:
+					if entry != nil {
+						manager.serverPool.disconnect(entry)
+					}
 					return p2p.DiscQuitting
 				}
 			},
@@ -192,7 +205,6 @@ func NewProtocolManager(chainConfig *params.ChainConfig, lightSync bool, network
 		manager.downloader = downloader.New(downloader.LightSync, chainDb, manager.eventMux, blockchain.HasHeader, nil, blockchain.GetHeaderByHash,
 			nil, blockchain.CurrentHeader, nil, nil, nil, blockchain.GetTdByHash,
 			blockchain.InsertHeaderChain, nil, nil, blockchain.Rollback, removePeer)
-		manager.fetcher = newLightFetcher(manager)
 	}
 
 	if odr != nil {
@@ -222,10 +234,12 @@ func (pm *ProtocolManager) removePeer(id string) {
 	glog.V(logger.Debug).Infof("LES: unregister peer %v", id)
 	if pm.lightSync {
 		pm.downloader.UnregisterPeer(id)
-		pm.odr.UnregisterPeer(peer)
 		if pm.txrelay != nil {
 			pm.txrelay.removePeer(id)
 		}
+		if pm.fetcher != nil {
+			pm.fetcher.removePeer(peer)
+		}
 	}
 	if err := pm.peers.Unregister(id); err != nil {
 		glog.V(logger.Error).Infoln("Removal failed:", err)
@@ -236,54 +250,26 @@ func (pm *ProtocolManager) removePeer(id string) {
 	}
 }
 
-func (pm *ProtocolManager) findServers() {
-	if pm.p2pServer == nil || pm.topicDisc == nil {
-		return
-	}
-	glog.V(logger.Debug).Infoln("Looking for topic", string(pm.lesTopic))
-	enodes := make(chan string, 100)
-	stop := make(chan struct{})
-	go pm.topicDisc.SearchTopic(pm.lesTopic, stop, enodes)
-	go func() {
-		added := make(map[string]bool)
-		for {
-			select {
-			case enode := <-enodes:
-				if !added[enode] {
-					glog.V(logger.Info).Infoln("Found LES server:", enode)
-					added[enode] = true
-					if node, err := discover.ParseNode(enode); err == nil {
-						pm.p2pServer.AddPeer(node)
-					}
-				}
-			case <-stop:
-				return
-			}
-		}
-	}()
-	select {
-	case <-time.After(time.Second * 20):
-	case <-pm.quitSync:
-	}
-	close(stop)
-}
-
 func (pm *ProtocolManager) Start(srvr *p2p.Server) {
-	pm.p2pServer = srvr
+	var topicDisc *discv5.Network
 	if srvr != nil {
-		pm.topicDisc = srvr.DiscV5
+		topicDisc = srvr.DiscV5
 	}
-	pm.lesTopic = discv5.Topic("LES@" + common.Bytes2Hex(pm.blockchain.Genesis().Hash().Bytes()[0:8]))
+	lesTopic := discv5.Topic("LES@" + common.Bytes2Hex(pm.blockchain.Genesis().Hash().Bytes()[0:8]))
 	if pm.lightSync {
 		// start sync handler
-		go pm.findServers()
+		if srvr != nil { // srvr is nil during testing
+			pm.serverPool = newServerPool(pm.chainDb, []byte("serverPool/"), srvr, lesTopic, pm.quitSync, &pm.wg)
+			pm.odr.serverPool = pm.serverPool
+			pm.fetcher = newLightFetcher(pm)
+		}
 		go pm.syncer()
 	} else {
-		if pm.topicDisc != nil {
+		if topicDisc != nil {
 			go func() {
-				glog.V(logger.Debug).Infoln("Starting registering topic", string(pm.lesTopic))
+				glog.V(logger.Info).Infoln("Starting registering topic", string(lesTopic))
-				pm.topicDisc.RegisterTopic(pm.lesTopic, pm.quitSync)
+				topicDisc.RegisterTopic(lesTopic, pm.quitSync)
-				glog.V(logger.Debug).Infoln("Stopped registering topic", string(pm.lesTopic))
+				glog.V(logger.Info).Infoln("Stopped registering topic", string(lesTopic))
 			}()
 		}
 		go func() {
@@ -352,13 +338,13 @@ func (pm *ProtocolManager) handle(p *peer) error {
 	glog.V(logger.Debug).Infof("LES: register peer %v", p.id)
 	if pm.lightSync {
 		requestHeadersByHash := func(origin common.Hash, amount int, skip int, reverse bool) error {
-			reqID := pm.odr.getNextReqID()
+			reqID := getNextReqID()
 			cost := p.GetRequestCost(GetBlockHeadersMsg, amount)
 			p.fcServer.SendRequest(reqID, cost)
 			return p.RequestHeadersByHash(reqID, cost, origin, amount, skip, reverse)
 		}
 		requestHeadersByNumber := func(origin uint64, amount int, skip int, reverse bool) error {
-			reqID := pm.odr.getNextReqID()
+			reqID := getNextReqID()
 			cost := p.GetRequestCost(GetBlockHeadersMsg, amount)
 			p.fcServer.SendRequest(reqID, cost)
 			return p.RequestHeadersByNumber(reqID, cost, origin, amount, skip, reverse)
@@ -367,12 +353,21 @@ func (pm *ProtocolManager) handle(p *peer) error {
 			requestHeadersByHash, requestHeadersByNumber, nil, nil, nil); err != nil {
 			return err
 		}
-		pm.odr.RegisterPeer(p)
 		if pm.txrelay != nil {
 			pm.txrelay.addPeer(p)
 		}
 
-		pm.fetcher.notify(p, nil)
+		p.lock.Lock()
+		head := p.headInfo
+		p.lock.Unlock()
+		if pm.fetcher != nil {
+			pm.fetcher.addPeer(p)
+			pm.fetcher.announce(p, head)
+		}
+
+		if p.poolEntry != nil {
+			pm.serverPool.registered(p.poolEntry)
+		}
 	}
 
 	stop := make(chan struct{})
@@ -454,7 +449,9 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
 			return errResp(ErrDecode, "%v: %v", msg, err)
 		}
 		glog.V(logger.Detail).Infoln("AnnounceMsg:", req.Number, req.Hash, req.Td, req.ReorgDepth)
-		pm.fetcher.notify(p, &req)
+		if pm.fetcher != nil {
+			go pm.fetcher.announce(p, &req)
+		}
 
 	case GetBlockHeadersMsg:
 		glog.V(logger.Debug).Infof("<=== GetBlockHeadersMsg from peer %v", p.id)
@@ -552,8 +549,8 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
 			return errResp(ErrDecode, "msg %v: %v", msg, err)
 		}
 		p.fcServer.GotReply(resp.ReqID, resp.BV)
-		if pm.fetcher.requestedID(resp.ReqID) {
+		if pm.fetcher != nil && pm.fetcher.requestedID(resp.ReqID) {
-			pm.fetcher.deliverHeaders(resp.ReqID, resp.Headers)
+			pm.fetcher.deliverHeaders(p, resp.ReqID, resp.Headers)
 		} else {
 			err := pm.downloader.DeliverHeaders(p.id, resp.Headers)
 			if err != nil {
@@ -879,7 +876,11 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
 		if reqCnt > maxReqs || reqCnt > MaxTxSend {
 			return errResp(ErrRequestRejected, "")
 		}
-		pm.txpool.AddBatch(txs)
+
+		if err := pm.txpool.AddBatch(txs); err != nil {
+			return errResp(ErrUnexpectedResponse, "msg: %v", err)
+		}
+
 		_, rcost := p.fcClient.RequestProcessed(costs.baseCost + uint64(reqCnt)*costs.reqCost)
 		pm.server.fcCostStats.update(msg.Code, uint64(reqCnt), rcost)
 

les/helper_test.go

@@ -25,6 +25,7 @@ import (
 	"math/big"
 	"sync"
 	"testing"
+	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
@@ -334,3 +335,13 @@ func (p *testPeer) handshake(t *testing.T, td *big.Int, head common.Hash, headNu
 func (p *testPeer) close() {
 	p.app.Close()
 }
+
+type testServerPool peer
+
+func (p *testServerPool) selectPeer(func(*peer) (bool, uint64)) *peer {
+	return (*peer)(p)
+}
+
+func (p *testServerPool) adjustResponseTime(*poolEntry, time.Duration, bool) {
+
+}

les/odr.go

@@ -17,6 +17,8 @@
 package les
 
 import (
+	"crypto/rand"
+	"encoding/binary"
 	"sync"
 	"time"
 
@@ -37,6 +39,11 @@ var (
 // peerDropFn is a callback type for dropping a peer detected as malicious.
 type peerDropFn func(id string)
 
+type odrPeerSelector interface {
+	selectPeer(func(*peer) (bool, uint64)) *peer
+	adjustResponseTime(*poolEntry, time.Duration, bool)
+}
+
 type LesOdr struct {
 	light.OdrBackend
 	db           ethdb.Database
@@ -44,15 +51,13 @@ type LesOdr struct {
 	removePeer   peerDropFn
 	mlock, clock sync.Mutex
 	sentReqs     map[uint64]*sentReq
-	peers        *odrPeerSet
+	serverPool   odrPeerSelector
-	lastReqID    uint64
 }
 
 func NewLesOdr(db ethdb.Database) *LesOdr {
 	return &LesOdr{
 		db:       db,
 		stop:     make(chan struct{}),
-		peers:    newOdrPeerSet(),
 		sentReqs: make(map[uint64]*sentReq),
 	}
 }
@@ -77,16 +82,6 @@ type sentReq struct {
 	answered chan struct{} // closed and set to nil when any peer answers it
 }
 
-// RegisterPeer registers a new LES peer to the ODR capable peer set
-func (self *LesOdr) RegisterPeer(p *peer) error {
-	return self.peers.register(p)
-}
-
-// UnregisterPeer removes a peer from the ODR capable peer set
-func (self *LesOdr) UnregisterPeer(p *peer) {
-	self.peers.unregister(p)
-}
-
 const (
 	MsgBlockBodies = iota
 	MsgCode
@@ -142,29 +137,26 @@ func (self *LesOdr) requestPeer(req *sentReq, peer *peer, delivered, timeout cha
 
 	select {
 	case <-delivered:
-		servTime := uint64(mclock.Now() - stime)
+		if self.serverPool != nil {
-		self.peers.updateTimeout(peer, false)
+			self.serverPool.adjustResponseTime(peer.poolEntry, time.Duration(mclock.Now()-stime), false)
-		self.peers.updateServTime(peer, servTime)
+		}
 		return
 	case <-time.After(softRequestTimeout):
 		close(timeout)
-		if self.peers.updateTimeout(peer, true) {
-			self.removePeer(peer.id)
-		}
 	case <-self.stop:
 		return
 	}
 
 	select {
 	case <-delivered:
-		servTime := uint64(mclock.Now() - stime)
-		self.peers.updateServTime(peer, servTime)
-		return
 	case <-time.After(hardRequestTimeout):
-		self.removePeer(peer.id)
+		go self.removePeer(peer.id)
 	case <-self.stop:
 		return
 	}
+	if self.serverPool != nil {
+		self.serverPool.adjustResponseTime(peer.poolEntry, time.Duration(mclock.Now()-stime), true)
+	}
 }
 
 // networkRequest sends a request to known peers until an answer is received
@@ -176,7 +168,7 @@ func (self *LesOdr) networkRequest(ctx context.Context, lreq LesOdrRequest) erro
 		sentTo:   make(map[*peer]chan struct{}),
 		answered: answered, // reply delivered by any peer
 	}
-	reqID := self.getNextReqID()
+	reqID := getNextReqID()
 	self.mlock.Lock()
 	self.sentReqs[reqID] = req
 	self.mlock.Unlock()
@@ -193,7 +185,16 @@ func (self *LesOdr) networkRequest(ctx context.Context, lreq LesOdrRequest) erro
 
 	exclude := make(map[*peer]struct{})
 	for {
-		if peer := self.peers.bestPeer(lreq, exclude); peer == nil {
+		var p *peer
+		if self.serverPool != nil {
+			p = self.serverPool.selectPeer(func(p *peer) (bool, uint64) {
+				if !lreq.CanSend(p) {
+					return false, 0
+				}
+				return true, p.fcServer.CanSend(lreq.GetCost(p))
+			})
+		}
+		if p == nil {
 			select {
 			case <-ctx.Done():
 				return ctx.Err()
@@ -202,17 +203,17 @@ func (self *LesOdr) networkRequest(ctx context.Context, lreq LesOdrRequest) erro
 			case <-time.After(retryPeers):
 			}
 		} else {
-			exclude[peer] = struct{}{}
+			exclude[p] = struct{}{}
 			delivered := make(chan struct{})
 			timeout := make(chan struct{})
 			req.lock.Lock()
-			req.sentTo[peer] = delivered
+			req.sentTo[p] = delivered
 			req.lock.Unlock()
 			reqWg.Add(1)
-			cost := lreq.GetCost(peer)
+			cost := lreq.GetCost(p)
-			peer.fcServer.SendRequest(reqID, cost)
+			p.fcServer.SendRequest(reqID, cost)
-			go self.requestPeer(req, peer, delivered, timeout, reqWg)
+			go self.requestPeer(req, p, delivered, timeout, reqWg)
-			lreq.Request(reqID, peer)
+			lreq.Request(reqID, p)
 
 			select {
 			case <-ctx.Done():
@@ -239,10 +240,8 @@ func (self *LesOdr) Retrieve(ctx context.Context, req light.OdrRequest) (err err
 	return
 }
 
-func (self *LesOdr) getNextReqID() uint64 {
+func getNextReqID() uint64 {
-	self.clock.Lock()
+	var rnd [8]byte
-	defer self.clock.Unlock()
+	rand.Read(rnd[:])
-
+	return binary.BigEndian.Uint64(rnd[:])
-	self.lastReqID++
-	return self.lastReqID
 }

les/odr_peerset.go

@@ -1,120 +0,0 @@
-// Copyright 2016 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package les
-
-import (
-	"sync"
-)
-
-const dropTimeoutRatio = 20
-
-type odrPeerInfo struct {
-	reqTimeSum, reqTimeCnt, reqCnt, timeoutCnt uint64
-}
-
-// odrPeerSet represents the collection of active peer participating in the block
-// download procedure.
-type odrPeerSet struct {
-	peers map[*peer]*odrPeerInfo
-	lock  sync.RWMutex
-}
-
-// newPeerSet creates a new peer set top track the active download sources.
-func newOdrPeerSet() *odrPeerSet {
-	return &odrPeerSet{
-		peers: make(map[*peer]*odrPeerInfo),
-	}
-}
-
-// Register injects a new peer into the working set, or returns an error if the
-// peer is already known.
-func (ps *odrPeerSet) register(p *peer) error {
-	ps.lock.Lock()
-	defer ps.lock.Unlock()
-
-	if _, ok := ps.peers[p]; ok {
-		return errAlreadyRegistered
-	}
-	ps.peers[p] = &odrPeerInfo{}
-	return nil
-}
-
-// Unregister removes a remote peer from the active set, disabling any further
-// actions to/from that particular entity.
-func (ps *odrPeerSet) unregister(p *peer) error {
-	ps.lock.Lock()
-	defer ps.lock.Unlock()
-
-	if _, ok := ps.peers[p]; !ok {
-		return errNotRegistered
-	}
-	delete(ps.peers, p)
-	return nil
-}
-
-func (ps *odrPeerSet) peerPriority(p *peer, info *odrPeerInfo, req LesOdrRequest) uint64 {
-	tm := p.fcServer.CanSend(req.GetCost(p))
-	if info.reqTimeCnt > 0 {
-		tm += info.reqTimeSum / info.reqTimeCnt
-	}
-	return tm
-}
-
-func (ps *odrPeerSet) bestPeer(req LesOdrRequest, exclude map[*peer]struct{}) *peer {
-	var best *peer
-	var bpv uint64
-	ps.lock.Lock()
-	defer ps.lock.Unlock()
-
-	for p, info := range ps.peers {
-		if _, ok := exclude[p]; !ok {
-			pv := ps.peerPriority(p, info, req)
-			if best == nil || pv < bpv {
-				best = p
-				bpv = pv
-			}
-		}
-	}
-	return best
-}
-
-func (ps *odrPeerSet) updateTimeout(p *peer, timeout bool) (drop bool) {
-	ps.lock.Lock()
-	defer ps.lock.Unlock()
-
-	if info, ok := ps.peers[p]; ok {
-		info.reqCnt++
-		if timeout {
-			// check ratio before increase to allow an extra timeout
-			if info.timeoutCnt*dropTimeoutRatio >= info.reqCnt {
-				return true
-			}
-			info.timeoutCnt++
-		}
-	}
-	return false
-}
-
-func (ps *odrPeerSet) updateServTime(p *peer, servTime uint64) {
-	ps.lock.Lock()
-	defer ps.lock.Unlock()
-
-	if info, ok := ps.peers[p]; ok {
-		info.reqTimeSum += servTime
-		info.reqTimeCnt++
-	}
-}

les/odr_requests.go

@@ -36,6 +36,7 @@ import (
 
 type LesOdrRequest interface {
 	GetCost(*peer) uint64
+	CanSend(*peer) bool
 	Request(uint64, *peer) error
 	Valid(ethdb.Database, *Msg) bool // if true, keeps the retrieved object
 }
@@ -66,6 +67,11 @@ func (self *BlockRequest) GetCost(peer *peer) uint64 {
 	return peer.GetRequestCost(GetBlockBodiesMsg, 1)
 }
 
+// CanSend tells if a certain peer is suitable for serving the given request
+func (self *BlockRequest) CanSend(peer *peer) bool {
+	return peer.HasBlock(self.Hash, self.Number)
+}
+
 // Request sends an ODR request to the LES network (implementation of LesOdrRequest)
 func (self *BlockRequest) Request(reqID uint64, peer *peer) error {
 	glog.V(logger.Debug).Infof("ODR: requesting body of block %08x from peer %v", self.Hash[:4], peer.id)
@@ -121,6 +127,11 @@ func (self *ReceiptsRequest) GetCost(peer *peer) uint64 {
 	return peer.GetRequestCost(GetReceiptsMsg, 1)
 }
 
+// CanSend tells if a certain peer is suitable for serving the given request
+func (self *ReceiptsRequest) CanSend(peer *peer) bool {
+	return peer.HasBlock(self.Hash, self.Number)
+}
+
 // Request sends an ODR request to the LES network (implementation of LesOdrRequest)
 func (self *ReceiptsRequest) Request(reqID uint64, peer *peer) error {
 	glog.V(logger.Debug).Infof("ODR: requesting receipts for block %08x from peer %v", self.Hash[:4], peer.id)
@@ -171,6 +182,11 @@ func (self *TrieRequest) GetCost(peer *peer) uint64 {
 	return peer.GetRequestCost(GetProofsMsg, 1)
 }
 
+// CanSend tells if a certain peer is suitable for serving the given request
+func (self *TrieRequest) CanSend(peer *peer) bool {
+	return peer.HasBlock(self.Id.BlockHash, self.Id.BlockNumber)
+}
+
 // Request sends an ODR request to the LES network (implementation of LesOdrRequest)
 func (self *TrieRequest) Request(reqID uint64, peer *peer) error {
 	glog.V(logger.Debug).Infof("ODR: requesting trie root %08x key %08x from peer %v", self.Id.Root[:4], self.Key[:4], peer.id)
@@ -221,6 +237,11 @@ func (self *CodeRequest) GetCost(peer *peer) uint64 {
 	return peer.GetRequestCost(GetCodeMsg, 1)
 }
 
+// CanSend tells if a certain peer is suitable for serving the given request
+func (self *CodeRequest) CanSend(peer *peer) bool {
+	return peer.HasBlock(self.Id.BlockHash, self.Id.BlockNumber)
+}
+
 // Request sends an ODR request to the LES network (implementation of LesOdrRequest)
 func (self *CodeRequest) Request(reqID uint64, peer *peer) error {
 	glog.V(logger.Debug).Infof("ODR: requesting node data for hash %08x from peer %v", self.Hash[:4], peer.id)
@@ -274,6 +295,14 @@ func (self *ChtRequest) GetCost(peer *peer) uint64 {
 	return peer.GetRequestCost(GetHeaderProofsMsg, 1)
 }
 
+// CanSend tells if a certain peer is suitable for serving the given request
+func (self *ChtRequest) CanSend(peer *peer) bool {
+	peer.lock.RLock()
+	defer peer.lock.RUnlock()
+
+	return self.ChtNum <= (peer.headInfo.Number-light.ChtConfirmations)/light.ChtFrequency
+}
+
 // Request sends an ODR request to the LES network (implementation of LesOdrRequest)
 func (self *ChtRequest) Request(reqID uint64, peer *peer) error {
 	glog.V(logger.Debug).Infof("ODR: requesting CHT #%d block #%d from peer %v", self.ChtNum, self.BlockNum, peer.id)

les/odr_test.go

@@ -160,6 +160,8 @@ func testOdr(t *testing.T, protocol int, expFail uint64, fn odrTestFn) {
 	pm, db, odr := newTestProtocolManagerMust(t, false, 4, testChainGen)
 	lpm, ldb, odr := newTestProtocolManagerMust(t, true, 0, nil)
 	_, err1, lpeer, err2 := newTestPeerPair("peer", protocol, pm, lpm)
+	pool := (*testServerPool)(lpeer)
+	odr.serverPool = pool
 	select {
 	case <-time.After(time.Millisecond * 100):
 	case err := <-err1:
@@ -188,13 +190,13 @@ func testOdr(t *testing.T, protocol int, expFail uint64, fn odrTestFn) {
 	}
 
 	// temporarily remove peer to test odr fails
-	odr.UnregisterPeer(lpeer)
+	odr.serverPool = nil
 	// expect retrievals to fail (except genesis block) without a les peer
 	test(expFail)
-	odr.RegisterPeer(lpeer)
+	odr.serverPool = pool
 	// expect all retrievals to pass
 	test(5)
-	odr.UnregisterPeer(lpeer)
+	odr.serverPool = nil
 	// still expect all retrievals to pass, now data should be cached locally
 	test(5)
 }

les/peer.go

@@ -51,12 +51,14 @@ type peer struct {
 
 	id string
 
-	firstHeadInfo, headInfo *announceData
+	headInfo *announceData
-	headInfoLen             int
+	lock     sync.RWMutex
-	lock                    sync.RWMutex
 
 	announceChn chan announceData
 
+	poolEntry *poolEntry
+	hasBlock  func(common.Hash, uint64) bool
+
 	fcClient       *flowcontrol.ClientNode // nil if the peer is server only
 	fcServer       *flowcontrol.ServerNode // nil if the peer is client only
 	fcServerParams *flowcontrol.ServerParams
@@ -109,67 +111,6 @@ func (p *peer) headBlockInfo() blockInfo {
 	return blockInfo{Hash: p.headInfo.Hash, Number: p.headInfo.Number, Td: p.headInfo.Td}
 }
 
-func (p *peer) addNotify(announce *announceData) bool {
-	p.lock.Lock()
-	defer p.lock.Unlock()
-
-	if announce.Td.Cmp(p.headInfo.Td) < 1 {
-		return false
-	}
-	if p.headInfoLen >= maxHeadInfoLen {
-		//return false
-		p.firstHeadInfo = p.firstHeadInfo.next
-		p.headInfoLen--
-	}
-	if announce.haveHeaders == 0 {
-		hh := p.headInfo.Number - announce.ReorgDepth
-		if p.headInfo.haveHeaders < hh {
-			hh = p.headInfo.haveHeaders
-		}
-		announce.haveHeaders = hh
-	}
-	p.headInfo.next = announce
-	p.headInfo = announce
-	p.headInfoLen++
-	return true
-}
-
-func (p *peer) gotHeader(hash common.Hash, number uint64, td *big.Int) bool {
-	h := p.firstHeadInfo
-	ptr := 0
-	for h != nil {
-		if h.Hash == hash {
-			if h.Number != number || h.Td.Cmp(td) != 0 {
-				return false
-			}
-			h.headKnown = true
-			h.haveHeaders = h.Number
-			p.firstHeadInfo = h
-			p.headInfoLen -= ptr
-			last := h
-			h = h.next
-			// propagate haveHeaders through the chain
-			for h != nil {
-				hh := last.Number - h.ReorgDepth
-				if last.haveHeaders < hh {
-					hh = last.haveHeaders
-				}
-				if hh > h.haveHeaders {
-					h.haveHeaders = hh
-				} else {
-					return true
-				}
-				last = h
-				h = h.next
-			}
-			return true
-		}
-		h = h.next
-		ptr++
-	}
-	return true
-}
-
 // Td retrieves the current total difficulty of a peer.
 func (p *peer) Td() *big.Int {
 	p.lock.RLock()
@@ -195,6 +136,9 @@ func sendResponse(w p2p.MsgWriter, msgcode, reqID, bv uint64, data interface{})
 }
 
 func (p *peer) GetRequestCost(msgcode uint64, amount int) uint64 {
+	p.lock.RLock()
+	defer p.lock.RUnlock()
+
 	cost := p.fcCosts[msgcode].baseCost + p.fcCosts[msgcode].reqCost*uint64(amount)
 	if cost > p.fcServerParams.BufLimit {
 		cost = p.fcServerParams.BufLimit
@@ -202,6 +146,14 @@ func (p *peer) GetRequestCost(msgcode uint64, amount int) uint64 {
 	return cost
 }
 
+// HasBlock checks if the peer has a given block
+func (p *peer) HasBlock(hash common.Hash, number uint64) bool {
+	p.lock.RLock()
+	hashBlock := p.hasBlock
+	p.lock.RUnlock()
+	return hashBlock != nil && hashBlock(hash, number)
+}
+
 // SendAnnounce announces the availability of a number of blocks through
 // a hash notification.
 func (p *peer) SendAnnounce(request announceData) error {
@@ -453,9 +405,7 @@ func (p *peer) Handshake(td *big.Int, head common.Hash, headNum uint64, genesis
 		p.fcCosts = MRC.decode()
 	}
 
-	p.firstHeadInfo = &announceData{Td: rTd, Hash: rHash, Number: rNum}
+	p.headInfo = &announceData{Td: rTd, Hash: rHash, Number: rNum}
-	p.headInfo = p.firstHeadInfo
-	p.headInfoLen = 1
 	return nil
 }
 

les/randselect.go

@@ -0,0 +1,173 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// Package les implements the Light Ethereum Subprotocol.
+package les
+
+import (
+	"math/rand"
+)
+
+// wrsItem interface should be implemented by any entries that are to be selected from
+// a weightedRandomSelect set. Note that recalculating monotonously decreasing item
+// weights on-demand (without constantly calling update) is allowed
+type wrsItem interface {
+	Weight() int64
+}
+
+// weightedRandomSelect is capable of weighted random selection from a set of items
+type weightedRandomSelect struct {
+	root *wrsNode
+	idx  map[wrsItem]int
+}
+
+// newWeightedRandomSelect returns a new weightedRandomSelect structure
+func newWeightedRandomSelect() *weightedRandomSelect {
+	return &weightedRandomSelect{root: &wrsNode{maxItems: wrsBranches}, idx: make(map[wrsItem]int)}
+}
+
+// update updates an item's weight, adds it if it was non-existent or removes it if
+// the new weight is zero. Note that explicitly updating decreasing weights is not necessary.
+func (w *weightedRandomSelect) update(item wrsItem) {
+	w.setWeight(item, item.Weight())
+}
+
+// remove removes an item from the set
+func (w *weightedRandomSelect) remove(item wrsItem) {
+	w.setWeight(item, 0)
+}
+
+// setWeight sets an item's weight to a specific value (removes it if zero)
+func (w *weightedRandomSelect) setWeight(item wrsItem, weight int64) {
+	idx, ok := w.idx[item]
+	if ok {
+		w.root.setWeight(idx, weight)
+		if weight == 0 {
+			delete(w.idx, item)
+		}
+	} else {
+		if weight != 0 {
+			if w.root.itemCnt == w.root.maxItems {
+				// add a new level
+				newRoot := &wrsNode{sumWeight: w.root.sumWeight, itemCnt: w.root.itemCnt, level: w.root.level + 1, maxItems: w.root.maxItems * wrsBranches}
+				newRoot.items[0] = w.root
+				newRoot.weights[0] = w.root.sumWeight
+				w.root = newRoot
+			}
+			w.idx[item] = w.root.insert(item, weight)
+		}
+	}
+}
+
+// choose randomly selects an item from the set, with a chance proportional to its
+// current weight. If the weight of the chosen element has been decreased since the
+// last stored value, returns it with a newWeight/oldWeight chance, otherwise just
+// updates its weight and selects another one
+func (w *weightedRandomSelect) choose() wrsItem {
+	for {
+		if w.root.sumWeight == 0 {
+			return nil
+		}
+		val := rand.Int63n(w.root.sumWeight)
+		choice, lastWeight := w.root.choose(val)
+		weight := choice.Weight()
+		if weight != lastWeight {
+			w.setWeight(choice, weight)
+		}
+		if weight >= lastWeight || rand.Int63n(lastWeight) < weight {
+			return choice
+		}
+	}
+}
+
+const wrsBranches = 8 // max number of branches in the wrsNode tree
+
+// wrsNode is a node of a tree structure that can store wrsItems or further wrsNodes.
+type wrsNode struct {
+	items                    [wrsBranches]interface{}
+	weights                  [wrsBranches]int64
+	sumWeight                int64
+	level, itemCnt, maxItems int
+}
+
+// insert recursively inserts a new item to the tree and returns the item index
+func (n *wrsNode) insert(item wrsItem, weight int64) int {
+	branch := 0
+	for n.items[branch] != nil && (n.level == 0 || n.items[branch].(*wrsNode).itemCnt == n.items[branch].(*wrsNode).maxItems) {
+		branch++
+		if branch == wrsBranches {
+			panic(nil)
+		}
+	}
+	n.itemCnt++
+	n.sumWeight += weight
+	n.weights[branch] += weight
+	if n.level == 0 {
+		n.items[branch] = item
+		return branch
+	} else {
+		var subNode *wrsNode
+		if n.items[branch] == nil {
+			subNode = &wrsNode{maxItems: n.maxItems / wrsBranches, level: n.level - 1}
+			n.items[branch] = subNode
+		} else {
+			subNode = n.items[branch].(*wrsNode)
+		}
+		subIdx := subNode.insert(item, weight)
+		return subNode.maxItems*branch + subIdx
+	}
+}
+
+// setWeight updates the weight of a certain item (which should exist) and returns
+// the change of the last weight value stored in the tree
+func (n *wrsNode) setWeight(idx int, weight int64) int64 {
+	if n.level == 0 {
+		oldWeight := n.weights[idx]
+		n.weights[idx] = weight
+		diff := weight - oldWeight
+		n.sumWeight += diff
+		if weight == 0 {
+			n.items[idx] = nil
+			n.itemCnt--
+		}
+		return diff
+	}
+	branchItems := n.maxItems / wrsBranches
+	branch := idx / branchItems
+	diff := n.items[branch].(*wrsNode).setWeight(idx-branch*branchItems, weight)
+	n.weights[branch] += diff
+	n.sumWeight += diff
+	if weight == 0 {
+		n.itemCnt--
+	}
+	return diff
+}
+
+// choose recursively selects an item from the tree and returns it along with its weight
+func (n *wrsNode) choose(val int64) (wrsItem, int64) {
+	for i, w := range n.weights {
+		if val < w {
+			if n.level == 0 {
+				return n.items[i].(wrsItem), n.weights[i]
+			} else {
+				return n.items[i].(*wrsNode).choose(val)
+			}
+		} else {
+			val -= w
+		}
+	}
+	panic(nil)
+}

les/randselect_test.go

@@ -0,0 +1,67 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package les
+
+import (
+	"math/rand"
+	"testing"
+)
+
+type testWrsItem struct {
+	idx  int
+	widx *int
+}
+
+func (t *testWrsItem) Weight() int64 {
+	w := *t.widx
+	if w == -1 || w == t.idx {
+		return int64(t.idx + 1)
+	}
+	return 0
+}
+
+func TestWeightedRandomSelect(t *testing.T) {
+	testFn := func(cnt int) {
+		s := newWeightedRandomSelect()
+		w := -1
+		list := make([]testWrsItem, cnt)
+		for i, _ := range list {
+			list[i] = testWrsItem{idx: i, widx: &w}
+			s.update(&list[i])
+		}
+		w = rand.Intn(cnt)
+		c := s.choose()
+		if c == nil {
+			t.Errorf("expected item, got nil")
+		} else {
+			if c.(*testWrsItem).idx != w {
+				t.Errorf("expected another item")
+			}
+		}
+		w = -2
+		if s.choose() != nil {
+			t.Errorf("expected nil, got item")
+		}
+	}
+	testFn(1)
+	testFn(10)
+	testFn(100)
+	testFn(1000)
+	testFn(10000)
+	testFn(100000)
+	testFn(1000000)
+}

les/request_test.go

@@ -71,6 +71,8 @@ func testAccess(t *testing.T, protocol int, fn accessTestFn) {
 	pm, db, _ := newTestProtocolManagerMust(t, false, 4, testChainGen)
 	lpm, ldb, odr := newTestProtocolManagerMust(t, true, 0, nil)
 	_, err1, lpeer, err2 := newTestPeerPair("peer", protocol, pm, lpm)
+	pool := (*testServerPool)(lpeer)
+	odr.serverPool = pool
 	select {
 	case <-time.After(time.Millisecond * 100):
 	case err := <-err1:
@@ -100,11 +102,10 @@ func testAccess(t *testing.T, protocol int, fn accessTestFn) {
 	}
 
 	// temporarily remove peer to test odr fails
-	odr.UnregisterPeer(lpeer)
+	odr.serverPool = nil
 	// expect retrievals to fail (except genesis block) without a les peer
 	test(0)
-	odr.RegisterPeer(lpeer)
+	odr.serverPool = pool
 	// expect all retrievals to pass
 	test(5)
-	odr.UnregisterPeer(lpeer)
 }

les/server.go

@@ -42,6 +42,9 @@ type LesServer struct {
 	fcManager       *flowcontrol.ClientManager // nil if our node is client only
 	fcCostStats     *requestCostStats
 	defParams       *flowcontrol.ServerParams
+	srvr            *p2p.Server
+	synced, stopped bool
+	lock            sync.Mutex
 }
 
 func NewLesServer(eth *eth.Ethereum, config *eth.Config) (*LesServer, error) {
@@ -67,12 +70,35 @@ func (s *LesServer) Protocols() []p2p.Protocol {
 	return s.protocolManager.SubProtocols
 }
 
+// Start only starts the actual service if the ETH protocol has already been synced,
+// otherwise it will be started by Synced()
 func (s *LesServer) Start(srvr *p2p.Server) {
-	s.protocolManager.Start(srvr)
+	s.lock.Lock()
+	defer s.lock.Unlock()
 
+	s.srvr = srvr
+	if s.synced {
+		s.protocolManager.Start(s.srvr)
+	}
 }
 
+// Synced notifies the server that the ETH protocol has been synced and LES service can be started
+func (s *LesServer) Synced() {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	s.synced = true
+	if s.srvr != nil && !s.stopped {
+		s.protocolManager.Start(s.srvr)
+	}
+}
+
+// Stop stops the LES service
 func (s *LesServer) Stop() {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	s.stopped = true
 	s.fcCostStats.store()
 	s.fcManager.Stop()
 	go func() {
@@ -323,9 +349,8 @@ func (pm *ProtocolManager) blockLoop() {
 }
 
 var (
-	lastChtKey       = []byte("LastChtNumber") // chtNum (uint64 big endian)
+	lastChtKey = []byte("LastChtNumber") // chtNum (uint64 big endian)
-	chtPrefix        = []byte("cht")           // chtPrefix + chtNum (uint64 big endian) -> trie root hash
+	chtPrefix  = []byte("cht")           // chtPrefix + chtNum (uint64 big endian) -> trie root hash
-	chtConfirmations = light.ChtFrequency / 2
 )
 
 func getChtRoot(db ethdb.Database, num uint64) common.Hash {
@@ -346,8 +371,8 @@ func makeCht(db ethdb.Database) bool {
 	headNum := core.GetBlockNumber(db, headHash)
 
 	var newChtNum uint64
-	if headNum > chtConfirmations {
+	if headNum > light.ChtConfirmations {
-		newChtNum = (headNum - chtConfirmations) / light.ChtFrequency
+		newChtNum = (headNum - light.ChtConfirmations) / light.ChtFrequency
 	}
 
 	var lastChtNum uint64

les/serverpool.go

@@ -0,0 +1,766 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// Package les implements the Light Ethereum Subprotocol.
+package les
+
+import (
+	"io"
+	"math"
+	"math/rand"
+	"net"
+	"strconv"
+	"sync"
+	"time"
+
+	"github.com/ethereum/go-ethereum/common/mclock"
+	"github.com/ethereum/go-ethereum/ethdb"
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/logger/glog"
+	"github.com/ethereum/go-ethereum/p2p"
+	"github.com/ethereum/go-ethereum/p2p/discover"
+	"github.com/ethereum/go-ethereum/p2p/discv5"
+	"github.com/ethereum/go-ethereum/rlp"
+)
+
+const (
+	// After a connection has been ended or timed out, there is a waiting period
+	// before it can be selected for connection again.
+	// waiting period = base delay * (1 + random(1))
+	// base delay = shortRetryDelay for the first shortRetryCnt times after a
+	// successful connection, after that longRetryDelay is applied
+	shortRetryCnt   = 5
+	shortRetryDelay = time.Second * 5
+	longRetryDelay  = time.Minute * 10
+	// maxNewEntries is the maximum number of newly discovered (never connected) nodes.
+	// If the limit is reached, the least recently discovered one is thrown out.
+	maxNewEntries = 1000
+	// maxKnownEntries is the maximum number of known (already connected) nodes.
+	// If the limit is reached, the least recently connected one is thrown out.
+	// (not that unlike new entries, known entries are persistent)
+	maxKnownEntries = 1000
+	// target for simultaneously connected servers
+	targetServerCount = 5
+	// target for servers selected from the known table
+	// (we leave room for trying new ones if there is any)
+	targetKnownSelect = 3
+	// after dialTimeout, consider the server unavailable and adjust statistics
+	dialTimeout = time.Second * 30
+	// targetConnTime is the minimum expected connection duration before a server
+	// drops a client without any specific reason
+	targetConnTime = time.Minute * 10
+	// new entry selection weight calculation based on most recent discovery time:
+	// unity until discoverExpireStart, then exponential decay with discoverExpireConst
+	discoverExpireStart = time.Minute * 20
+	discoverExpireConst = time.Minute * 20
+	// known entry selection weight is dropped by a factor of exp(-failDropLn) after
+	// each unsuccessful connection (restored after a successful one)
+	failDropLn = 0.1
+	// known node connection success and quality statistics have a long term average
+	// and a short term value which is adjusted exponentially with a factor of
+	// pstatRecentAdjust with each dial/connection and also returned exponentially
+	// to the average with the time constant pstatReturnToMeanTC
+	pstatRecentAdjust   = 0.1
+	pstatReturnToMeanTC = time.Hour
+	// node address selection weight is dropped by a factor of exp(-addrFailDropLn) after
+	// each unsuccessful connection (restored after a successful one)
+	addrFailDropLn = math.Ln2
+	// responseScoreTC and delayScoreTC are exponential decay time constants for
+	// calculating selection chances from response times and block delay times
+	responseScoreTC = time.Millisecond * 100
+	delayScoreTC    = time.Second * 5
+	timeoutPow      = 10
+	// peerSelectMinWeight is added to calculated weights at request peer selection
+	// to give poorly performing peers a little chance of coming back
+	peerSelectMinWeight = 0.005
+	// initStatsWeight is used to initialize previously unknown peers with good
+	// statistics to give a chance to prove themselves
+	initStatsWeight = 1
+)
+
+// serverPool implements a pool for storing and selecting newly discovered and already
+// known light server nodes. It received discovered nodes, stores statistics about
+// known nodes and takes care of always having enough good quality servers connected.
+type serverPool struct {
+	db     ethdb.Database
+	dbKey  []byte
+	server *p2p.Server
+	quit   chan struct{}
+	wg     *sync.WaitGroup
+	connWg sync.WaitGroup
+
+	discSetPeriod chan time.Duration
+	discNodes     chan *discv5.Node
+	discLookups   chan bool
+
+	entries              map[discover.NodeID]*poolEntry
+	lock                 sync.Mutex
+	timeout, enableRetry chan *poolEntry
+	adjustStats          chan poolStatAdjust
+
+	knownQueue, newQueue       poolEntryQueue
+	knownSelect, newSelect     *weightedRandomSelect
+	knownSelected, newSelected int
+	fastDiscover               bool
+}
+
+// newServerPool creates a new serverPool instance
+func newServerPool(db ethdb.Database, dbPrefix []byte, server *p2p.Server, topic discv5.Topic, quit chan struct{}, wg *sync.WaitGroup) *serverPool {
+	pool := &serverPool{
+		db:           db,
+		dbKey:        append(dbPrefix, []byte(topic)...),
+		server:       server,
+		quit:         quit,
+		wg:           wg,
+		entries:      make(map[discover.NodeID]*poolEntry),
+		timeout:      make(chan *poolEntry, 1),
+		adjustStats:  make(chan poolStatAdjust, 100),
+		enableRetry:  make(chan *poolEntry, 1),
+		knownSelect:  newWeightedRandomSelect(),
+		newSelect:    newWeightedRandomSelect(),
+		fastDiscover: true,
+	}
+	pool.knownQueue = newPoolEntryQueue(maxKnownEntries, pool.removeEntry)
+	pool.newQueue = newPoolEntryQueue(maxNewEntries, pool.removeEntry)
+	wg.Add(1)
+	pool.loadNodes()
+	pool.checkDial()
+
+	if pool.server.DiscV5 != nil {
+		pool.discSetPeriod = make(chan time.Duration, 1)
+		pool.discNodes = make(chan *discv5.Node, 100)
+		pool.discLookups = make(chan bool, 100)
+		go pool.server.DiscV5.SearchTopic(topic, pool.discSetPeriod, pool.discNodes, pool.discLookups)
+	}
+
+	go pool.eventLoop()
+	return pool
+}
+
+// connect should be called upon any incoming connection. If the connection has been
+// dialed by the server pool recently, the appropriate pool entry is returned.
+// Otherwise, the connection should be rejected.
+// Note that whenever a connection has been accepted and a pool entry has been returned,
+// disconnect should also always be called.
+func (pool *serverPool) connect(p *peer, ip net.IP, port uint16) *poolEntry {
+	pool.lock.Lock()
+	defer pool.lock.Unlock()
+	entry := pool.entries[p.ID()]
+	if entry == nil {
+		return nil
+	}
+	glog.V(logger.Debug).Infof("connecting to %v, state: %v", p.id, entry.state)
+	if entry.state != psDialed {
+		return nil
+	}
+	pool.connWg.Add(1)
+	entry.peer = p
+	entry.state = psConnected
+	addr := &poolEntryAddress{
+		ip:       ip,
+		port:     port,
+		lastSeen: mclock.Now(),
+	}
+	entry.lastConnected = addr
+	entry.addr = make(map[string]*poolEntryAddress)
+	entry.addr[addr.strKey()] = addr
+	entry.addrSelect = *newWeightedRandomSelect()
+	entry.addrSelect.update(addr)
+	return entry
+}
+
+// registered should be called after a successful handshake
+func (pool *serverPool) registered(entry *poolEntry) {
+	glog.V(logger.Debug).Infof("registered %v", entry.id.String())
+	pool.lock.Lock()
+	defer pool.lock.Unlock()
+
+	entry.state = psRegistered
+	entry.regTime = mclock.Now()
+	if !entry.known {
+		pool.newQueue.remove(entry)
+		entry.known = true
+	}
+	pool.knownQueue.setLatest(entry)
+	entry.shortRetry = shortRetryCnt
+}
+
+// disconnect should be called when ending a connection. Service quality statistics
+// can be updated optionally (not updated if no registration happened, in this case
+// only connection statistics are updated, just like in case of timeout)
+func (pool *serverPool) disconnect(entry *poolEntry) {
+	glog.V(logger.Debug).Infof("disconnected %v", entry.id.String())
+	pool.lock.Lock()
+	defer pool.lock.Unlock()
+
+	if entry.state == psRegistered {
+		connTime := mclock.Now() - entry.regTime
+		connAdjust := float64(connTime) / float64(targetConnTime)
+		if connAdjust > 1 {
+			connAdjust = 1
+		}
+		stopped := false
+		select {
+		case <-pool.quit:
+			stopped = true
+		default:
+		}
+		if stopped {
+			entry.connectStats.add(1, connAdjust)
+		} else {
+			entry.connectStats.add(connAdjust, 1)
+		}
+	}
+
+	entry.state = psNotConnected
+	if entry.knownSelected {
+		pool.knownSelected--
+	} else {
+		pool.newSelected--
+	}
+	pool.setRetryDial(entry)
+	pool.connWg.Done()
+}
+
+const (
+	pseBlockDelay = iota
+	pseResponseTime
+	pseResponseTimeout
+)
+
+// poolStatAdjust records are sent to adjust peer block delay/response time statistics
+type poolStatAdjust struct {
+	adjustType int
+	entry      *poolEntry
+	time       time.Duration
+}
+
+// adjustBlockDelay adjusts the block announce delay statistics of a node
+func (pool *serverPool) adjustBlockDelay(entry *poolEntry, time time.Duration) {
+	pool.adjustStats <- poolStatAdjust{pseBlockDelay, entry, time}
+}
+
+// adjustResponseTime adjusts the request response time statistics of a node
+func (pool *serverPool) adjustResponseTime(entry *poolEntry, time time.Duration, timeout bool) {
+	if timeout {
+		pool.adjustStats <- poolStatAdjust{pseResponseTimeout, entry, time}
+	} else {
+		pool.adjustStats <- poolStatAdjust{pseResponseTime, entry, time}
+	}
+}
+
+type selectPeerItem struct {
+	peer   *peer
+	weight int64
+}
+
+func (sp selectPeerItem) Weight() int64 {
+	return sp.weight
+}
+
+// selectPeer selects a suitable peer for a request
+func (pool *serverPool) selectPeer(canSend func(*peer) (bool, uint64)) *peer {
+	pool.lock.Lock()
+	defer pool.lock.Unlock()
+
+	sel := newWeightedRandomSelect()
+	for _, entry := range pool.entries {
+		if entry.state == psRegistered {
+			p := entry.peer
+			ok, cost := canSend(p)
+			if ok {
+				w := int64(1000000000 * (peerSelectMinWeight + math.Exp(-(entry.responseStats.recentAvg()+float64(cost))/float64(responseScoreTC))*math.Pow((1-entry.timeoutStats.recentAvg()), timeoutPow)))
+				sel.update(selectPeerItem{peer: p, weight: w})
+			}
+		}
+	}
+	choice := sel.choose()
+	if choice == nil {
+		return nil
+	}
+	return choice.(selectPeerItem).peer
+}
+
+// eventLoop handles pool events and mutex locking for all internal functions
+func (pool *serverPool) eventLoop() {
+	lookupCnt := 0
+	var convTime mclock.AbsTime
+	pool.discSetPeriod <- time.Millisecond * 100
+	for {
+		select {
+		case entry := <-pool.timeout:
+			pool.lock.Lock()
+			if !entry.removed {
+				pool.checkDialTimeout(entry)
+			}
+			pool.lock.Unlock()
+
+		case entry := <-pool.enableRetry:
+			pool.lock.Lock()
+			if !entry.removed {
+				entry.delayedRetry = false
+				pool.updateCheckDial(entry)
+			}
+			pool.lock.Unlock()
+
+		case adj := <-pool.adjustStats:
+			pool.lock.Lock()
+			switch adj.adjustType {
+			case pseBlockDelay:
+				adj.entry.delayStats.add(float64(adj.time), 1)
+			case pseResponseTime:
+				adj.entry.responseStats.add(float64(adj.time), 1)
+				adj.entry.timeoutStats.add(0, 1)
+			case pseResponseTimeout:
+				adj.entry.timeoutStats.add(1, 1)
+			}
+			pool.lock.Unlock()
+
+		case node := <-pool.discNodes:
+			pool.lock.Lock()
+			now := mclock.Now()
+			id := discover.NodeID(node.ID)
+			entry := pool.entries[id]
+			if entry == nil {
+				glog.V(logger.Debug).Infof("discovered %v", node.String())
+				entry = &poolEntry{
+					id:         id,
+					addr:       make(map[string]*poolEntryAddress),
+					addrSelect: *newWeightedRandomSelect(),
+					shortRetry: shortRetryCnt,
+				}
+				pool.entries[id] = entry
+				// initialize previously unknown peers with good statistics to give a chance to prove themselves
+				entry.connectStats.add(1, initStatsWeight)
+				entry.delayStats.add(0, initStatsWeight)
+				entry.responseStats.add(0, initStatsWeight)
+				entry.timeoutStats.add(0, initStatsWeight)
+			}
+			entry.lastDiscovered = now
+			addr := &poolEntryAddress{
+				ip:   node.IP,
+				port: node.TCP,
+			}
+			if a, ok := entry.addr[addr.strKey()]; ok {
+				addr = a
+			} else {
+				entry.addr[addr.strKey()] = addr
+			}
+			addr.lastSeen = now
+			entry.addrSelect.update(addr)
+			if !entry.known {
+				pool.newQueue.setLatest(entry)
+			}
+			pool.updateCheckDial(entry)
+			pool.lock.Unlock()
+
+		case conv := <-pool.discLookups:
+			if conv {
+				if lookupCnt == 0 {
+					convTime = mclock.Now()
+				}
+				lookupCnt++
+				if pool.fastDiscover && (lookupCnt == 50 || time.Duration(mclock.Now()-convTime) > time.Minute) {
+					pool.fastDiscover = false
+					pool.discSetPeriod <- time.Minute
+				}
+			}
+
+		case <-pool.quit:
+			close(pool.discSetPeriod)
+			pool.connWg.Wait()
+			pool.saveNodes()
+			pool.wg.Done()
+			return
+
+		}
+	}
+}
+
+// loadNodes loads known nodes and their statistics from the database
+func (pool *serverPool) loadNodes() {
+	enc, err := pool.db.Get(pool.dbKey)
+	if err != nil {
+		return
+	}
+	var list []*poolEntry
+	err = rlp.DecodeBytes(enc, &list)
+	if err != nil {
+		glog.V(logger.Debug).Infof("node list decode error: %v", err)
+		return
+	}
+	for _, e := range list {
+		glog.V(logger.Debug).Infof("loaded server stats %016x  fails: %v  connStats: %v / %v  delayStats: %v / %v  responseStats: %v / %v  timeoutStats: %v / %v", e.id[0:8], e.lastConnected.fails, e.connectStats.avg, e.connectStats.weight, time.Duration(e.delayStats.avg), e.delayStats.weight, time.Duration(e.responseStats.avg), e.responseStats.weight, e.timeoutStats.avg, e.timeoutStats.weight)
+		pool.entries[e.id] = e
+		pool.knownQueue.setLatest(e)
+		pool.knownSelect.update((*knownEntry)(e))
+	}
+}
+
+// saveNodes saves known nodes and their statistics into the database. Nodes are
+// ordered from least to most recently connected.
+func (pool *serverPool) saveNodes() {
+	list := make([]*poolEntry, len(pool.knownQueue.queue))
+	for i, _ := range list {
+		list[i] = pool.knownQueue.fetchOldest()
+	}
+	enc, err := rlp.EncodeToBytes(list)
+	if err == nil {
+		pool.db.Put(pool.dbKey, enc)
+	}
+}
+
+// removeEntry removes a pool entry when the entry count limit is reached.
+// Note that it is called by the new/known queues from which the entry has already
+// been removed so removing it from the queues is not necessary.
+func (pool *serverPool) removeEntry(entry *poolEntry) {
+	pool.newSelect.remove((*discoveredEntry)(entry))
+	pool.knownSelect.remove((*knownEntry)(entry))
+	entry.removed = true
+	delete(pool.entries, entry.id)
+}
+
+// setRetryDial starts the timer which will enable dialing a certain node again
+func (pool *serverPool) setRetryDial(entry *poolEntry) {
+	delay := longRetryDelay
+	if entry.shortRetry > 0 {
+		entry.shortRetry--
+		delay = shortRetryDelay
+	}
+	delay += time.Duration(rand.Int63n(int64(delay) + 1))
+	entry.delayedRetry = true
+	go func() {
+		select {
+		case <-pool.quit:
+		case <-time.After(delay):
+			select {
+			case <-pool.quit:
+			case pool.enableRetry <- entry:
+			}
+		}
+	}()
+}
+
+// updateCheckDial is called when an entry can potentially be dialed again. It updates
+// its selection weights and checks if new dials can/should be made.
+func (pool *serverPool) updateCheckDial(entry *poolEntry) {
+	pool.newSelect.update((*discoveredEntry)(entry))
+	pool.knownSelect.update((*knownEntry)(entry))
+	pool.checkDial()
+}
+
+// checkDial checks if new dials can/should be made. It tries to select servers both
+// based on good statistics and recent discovery.
+func (pool *serverPool) checkDial() {
+	fillWithKnownSelects := !pool.fastDiscover
+	for pool.knownSelected < targetKnownSelect {
+		entry := pool.knownSelect.choose()
+		if entry == nil {
+			fillWithKnownSelects = false
+			break
+		}
+		pool.dial((*poolEntry)(entry.(*knownEntry)), true)
+	}
+	for pool.knownSelected+pool.newSelected < targetServerCount {
+		entry := pool.newSelect.choose()
+		if entry == nil {
+			break
+		}
+		pool.dial((*poolEntry)(entry.(*discoveredEntry)), false)
+	}
+	if fillWithKnownSelects {
+		// no more newly discovered nodes to select and since fast discover period
+		// is over, we probably won't find more in the near future so select more
+		// known entries if possible
+		for pool.knownSelected < targetServerCount {
+			entry := pool.knownSelect.choose()
+			if entry == nil {
+				break
+			}
+			pool.dial((*poolEntry)(entry.(*knownEntry)), true)
+		}
+	}
+}
+
+// dial initiates a new connection
+func (pool *serverPool) dial(entry *poolEntry, knownSelected bool) {
+	if entry.state != psNotConnected {
+		return
+	}
+	entry.state = psDialed
+	entry.knownSelected = knownSelected
+	if knownSelected {
+		pool.knownSelected++
+	} else {
+		pool.newSelected++
+	}
+	addr := entry.addrSelect.choose().(*poolEntryAddress)
+	glog.V(logger.Debug).Infof("dialing %v out of %v, known: %v", entry.id.String()+"@"+addr.strKey(), len(entry.addr), knownSelected)
+	entry.dialed = addr
+	go func() {
+		pool.server.AddPeer(discover.NewNode(entry.id, addr.ip, addr.port, addr.port))
+		select {
+		case <-pool.quit:
+		case <-time.After(dialTimeout):
+			select {
+			case <-pool.quit:
+			case pool.timeout <- entry:
+			}
+		}
+	}()
+}
+
+// checkDialTimeout checks if the node is still in dialed state and if so, resets it
+// and adjusts connection statistics accordingly.
+func (pool *serverPool) checkDialTimeout(entry *poolEntry) {
+	if entry.state != psDialed {
+		return
+	}
+	glog.V(logger.Debug).Infof("timeout %v", entry.id.String()+"@"+entry.dialed.strKey())
+	entry.state = psNotConnected
+	if entry.knownSelected {
+		pool.knownSelected--
+	} else {
+		pool.newSelected--
+	}
+	entry.connectStats.add(0, 1)
+	entry.dialed.fails++
+	pool.setRetryDial(entry)
+}
+
+const (
+	psNotConnected = iota
+	psDialed
+	psConnected
+	psRegistered
+)
+
+// poolEntry represents a server node and stores its current state and statistics.
+type poolEntry struct {
+	peer                  *peer
+	id                    discover.NodeID
+	addr                  map[string]*poolEntryAddress
+	lastConnected, dialed *poolEntryAddress
+	addrSelect            weightedRandomSelect
+
+	lastDiscovered              mclock.AbsTime
+	known, knownSelected        bool
+	connectStats, delayStats    poolStats
+	responseStats, timeoutStats poolStats
+	state                       int
+	regTime                     mclock.AbsTime
+	queueIdx                    int
+	removed                     bool
+
+	delayedRetry bool
+	shortRetry   int
+}
+
+func (e *poolEntry) EncodeRLP(w io.Writer) error {
+	return rlp.Encode(w, []interface{}{e.id, e.lastConnected.ip, e.lastConnected.port, e.lastConnected.fails, &e.connectStats, &e.delayStats, &e.responseStats, &e.timeoutStats})
+}
+
+func (e *poolEntry) DecodeRLP(s *rlp.Stream) error {
+	var entry struct {
+		ID                         discover.NodeID
+		IP                         net.IP
+		Port                       uint16
+		Fails                      uint
+		CStat, DStat, RStat, TStat poolStats
+	}
+	if err := s.Decode(&entry); err != nil {
+		return err
+	}
+	addr := &poolEntryAddress{ip: entry.IP, port: entry.Port, fails: entry.Fails, lastSeen: mclock.Now()}
+	e.id = entry.ID
+	e.addr = make(map[string]*poolEntryAddress)
+	e.addr[addr.strKey()] = addr
+	e.addrSelect = *newWeightedRandomSelect()
+	e.addrSelect.update(addr)
+	e.lastConnected = addr
+	e.connectStats = entry.CStat
+	e.delayStats = entry.DStat
+	e.responseStats = entry.RStat
+	e.timeoutStats = entry.TStat
+	e.shortRetry = shortRetryCnt
+	e.known = true
+	return nil
+}
+
+// discoveredEntry implements wrsItem
+type discoveredEntry poolEntry
+
+// Weight calculates random selection weight for newly discovered entries
+func (e *discoveredEntry) Weight() int64 {
+	if e.state != psNotConnected || e.delayedRetry {
+		return 0
+	}
+	t := time.Duration(mclock.Now() - e.lastDiscovered)
+	if t <= discoverExpireStart {
+		return 1000000000
+	} else {
+		return int64(1000000000 * math.Exp(-float64(t-discoverExpireStart)/float64(discoverExpireConst)))
+	}
+}
+
+// knownEntry implements wrsItem
+type knownEntry poolEntry
+
+// Weight calculates random selection weight for known entries
+func (e *knownEntry) Weight() int64 {
+	if e.state != psNotConnected || !e.known || e.delayedRetry {
+		return 0
+	}
+	return int64(1000000000 * e.connectStats.recentAvg() * math.Exp(-float64(e.lastConnected.fails)*failDropLn-e.responseStats.recentAvg()/float64(responseScoreTC)-e.delayStats.recentAvg()/float64(delayScoreTC)) * math.Pow((1-e.timeoutStats.recentAvg()), timeoutPow))
+}
+
+// poolEntryAddress is a separate object because currently it is necessary to remember
+// multiple potential network addresses for a pool entry. This will be removed after
+// the final implementation of v5 discovery which will retrieve signed and serial
+// numbered advertisements, making it clear which IP/port is the latest one.
+type poolEntryAddress struct {
+	ip       net.IP
+	port     uint16
+	lastSeen mclock.AbsTime // last time it was discovered, connected or loaded from db
+	fails    uint           // connection failures since last successful connection (persistent)
+}
+
+func (a *poolEntryAddress) Weight() int64 {
+	t := time.Duration(mclock.Now() - a.lastSeen)
+	return int64(1000000*math.Exp(-float64(t)/float64(discoverExpireConst)-float64(a.fails)*addrFailDropLn)) + 1
+}
+
+func (a *poolEntryAddress) strKey() string {
+	return a.ip.String() + ":" + strconv.Itoa(int(a.port))
+}
+
+// poolStats implement statistics for a certain quantity with a long term average
+// and a short term value which is adjusted exponentially with a factor of
+// pstatRecentAdjust with each update and also returned exponentially to the
+// average with the time constant pstatReturnToMeanTC
+type poolStats struct {
+	sum, weight, avg, recent float64
+	lastRecalc               mclock.AbsTime
+}
+
+// init initializes stats with a long term sum/update count pair retrieved from the database
+func (s *poolStats) init(sum, weight float64) {
+	s.sum = sum
+	s.weight = weight
+	var avg float64
+	if weight > 0 {
+		avg = s.sum / weight
+	}
+	s.avg = avg
+	s.recent = avg
+	s.lastRecalc = mclock.Now()
+}
+
+// recalc recalculates recent value return-to-mean and long term average
+func (s *poolStats) recalc() {
+	now := mclock.Now()
+	s.recent = s.avg + (s.recent-s.avg)*math.Exp(-float64(now-s.lastRecalc)/float64(pstatReturnToMeanTC))
+	if s.sum == 0 {
+		s.avg = 0
+	} else {
+		if s.sum > s.weight*1e30 {
+			s.avg = 1e30
+		} else {
+			s.avg = s.sum / s.weight
+		}
+	}
+	s.lastRecalc = now
+}
+
+// add updates the stats with a new value
+func (s *poolStats) add(value, weight float64) {
+	s.weight += weight
+	s.sum += value * weight
+	s.recalc()
+}
+
+// recentAvg returns the short-term adjusted average
+func (s *poolStats) recentAvg() float64 {
+	s.recalc()
+	return s.recent
+}
+
+func (s *poolStats) EncodeRLP(w io.Writer) error {
+	return rlp.Encode(w, []interface{}{math.Float64bits(s.sum), math.Float64bits(s.weight)})
+}
+
+func (s *poolStats) DecodeRLP(st *rlp.Stream) error {
+	var stats struct {
+		SumUint, WeightUint uint64
+	}
+	if err := st.Decode(&stats); err != nil {
+		return err
+	}
+	s.init(math.Float64frombits(stats.SumUint), math.Float64frombits(stats.WeightUint))
+	return nil
+}
+
+// poolEntryQueue keeps track of its least recently accessed entries and removes
+// them when the number of entries reaches the limit
+type poolEntryQueue struct {
+	queue                  map[int]*poolEntry // known nodes indexed by their latest lastConnCnt value
+	newPtr, oldPtr, maxCnt int
+	removeFromPool         func(*poolEntry)
+}
+
+// newPoolEntryQueue returns a new poolEntryQueue
+func newPoolEntryQueue(maxCnt int, removeFromPool func(*poolEntry)) poolEntryQueue {
+	return poolEntryQueue{queue: make(map[int]*poolEntry), maxCnt: maxCnt, removeFromPool: removeFromPool}
+}
+
+// fetchOldest returns and removes the least recently accessed entry
+func (q *poolEntryQueue) fetchOldest() *poolEntry {
+	if len(q.queue) == 0 {
+		return nil
+	}
+	for {
+		if e := q.queue[q.oldPtr]; e != nil {
+			delete(q.queue, q.oldPtr)
+			q.oldPtr++
+			return e
+		}
+		q.oldPtr++
+	}
+}
+
+// remove removes an entry from the queue
+func (q *poolEntryQueue) remove(entry *poolEntry) {
+	if q.queue[entry.queueIdx] == entry {
+		delete(q.queue, entry.queueIdx)
+	}
+}
+
+// setLatest adds or updates a recently accessed entry. It also checks if an old entry
+// needs to be removed and removes it from the parent pool too with a callback function.
+func (q *poolEntryQueue) setLatest(entry *poolEntry) {
+	if q.queue[entry.queueIdx] == entry {
+		delete(q.queue, entry.queueIdx)
+	} else {
+		if len(q.queue) == q.maxCnt {
+			e := q.fetchOldest()
+			q.remove(e)
+			q.removeFromPool(e)
+		}
+	}
+	entry.queueIdx = q.newPtr
+	q.queue[entry.queueIdx] = entry
+	q.newPtr++
+}

light/lightchain.go

@@ -505,3 +505,14 @@ func (self *LightChain) SyncCht(ctx context.Context) bool {
 	}
 	return false
 }
+
+// LockChain locks the chain mutex for reading so that multiple canonical hashes can be
+// retrieved while it is guaranteed that they belong to the same version of the chain
+func (self *LightChain) LockChain() {
+	self.chainmu.RLock()
+}
+
+// UnlockChain unlocks the chain mutex
+func (self *LightChain) UnlockChain() {
+	self.chainmu.RUnlock()
+}

light/odr.go

@@ -48,6 +48,7 @@ type OdrRequest interface {
 // TrieID identifies a state or account storage trie
 type TrieID struct {
 	BlockHash, Root common.Hash
+	BlockNumber     uint64
 	AccKey          []byte
 }
 
@@ -55,9 +56,10 @@ type TrieID struct {
 // header.
 func StateTrieID(header *types.Header) *TrieID {
 	return &TrieID{
-		BlockHash: header.Hash(),
+		BlockHash:   header.Hash(),
-		AccKey:    nil,
+		BlockNumber: header.Number.Uint64(),
-		Root:      header.Root,
+		AccKey:      nil,
+		Root:        header.Root,
 	}
 }
 
@@ -66,9 +68,10 @@ func StateTrieID(header *types.Header) *TrieID {
 // checking Merkle proofs.
 func StorageTrieID(state *TrieID, addr common.Address, root common.Hash) *TrieID {
 	return &TrieID{
-		BlockHash: state.BlockHash,
+		BlockHash:   state.BlockHash,
-		AccKey:    crypto.Keccak256(addr[:]),
+		BlockNumber: state.BlockNumber,
-		Root:      root,
+		AccKey:      crypto.Keccak256(addr[:]),
+		Root:        root,
 	}
 }
 

light/odr_util.go

@@ -38,8 +38,9 @@ var (
 	ErrNoTrustedCht = errors.New("No trusted canonical hash trie")
 	ErrNoHeader     = errors.New("Header not found")
 
-	ChtFrequency  = uint64(4096)
+	ChtFrequency     = uint64(4096)
-	trustedChtKey = []byte("TrustedCHT")
+	ChtConfirmations = uint64(2048)
+	trustedChtKey    = []byte("TrustedCHT")
 )
 
 type ChtNode struct {

light/txpool.go

@@ -346,19 +346,8 @@ func (pool *TxPool) validateTx(ctx context.Context, tx *types.Transaction) error
 	if from, err = types.Sender(pool.signer, tx); err != nil {
 		return core.ErrInvalidSender
 	}
-
-	// Make sure the account exist. Non existent accounts
-	// haven't got funds and well therefor never pass.
-	currentState := pool.currentState()
-	if h, err := currentState.HasAccount(ctx, from); err == nil {
-		if !h {
-			return core.ErrNonExistentAccount
-		}
-	} else {
-		return err
-	}
-
 	// Last but not least check for nonce errors
+	currentState := pool.currentState()
 	if n, err := currentState.GetNonce(ctx, from); err == nil {
 		if n > tx.Nonce() {
 			return core.ErrNonce
@@ -500,7 +489,7 @@ func (tp *TxPool) GetTransaction(hash common.Hash) *types.Transaction {
 
 // GetTransactions returns all currently processable transactions.
 // The returned slice may be modified by the caller.
-func (self *TxPool) GetTransactions() (txs types.Transactions) {
+func (self *TxPool) GetTransactions() (txs types.Transactions, err error) {
 	self.mu.RLock()
 	defer self.mu.RUnlock()
 
@@ -510,7 +499,7 @@ func (self *TxPool) GetTransactions() (txs types.Transactions) {
 		txs[i] = tx
 		i++
 	}
-	return txs
+	return txs, nil
 }
 
 // Content retrieves the data content of the transaction pool, returning all the

miner/miner.go

@@ -119,15 +119,14 @@ func (m *Miner) SetGasPrice(price *big.Int) {
 
 func (self *Miner) Start(coinbase common.Address, threads int) {
 	atomic.StoreInt32(&self.shouldStart, 1)
-	self.threads = threads
+	self.worker.setEtherbase(coinbase)
-	self.worker.coinbase = coinbase
 	self.coinbase = coinbase
+	self.threads = threads
 
 	if atomic.LoadInt32(&self.canStart) == 0 {
 		glog.V(logger.Info).Infoln("Can not start mining operation due to network sync (starts when finished)")
 		return
 	}
-
 	atomic.StoreInt32(&self.mining, 1)
 
 	for i := 0; i < threads; i++ {
@@ -135,9 +134,7 @@ func (self *Miner) Start(coinbase common.Address, threads int) {
 	}
 
 	glog.V(logger.Info).Infof("Starting mining operation (CPU=%d TOT=%d)\n", threads, len(self.worker.agents))
-
 	self.worker.start()
-
 	self.worker.commitNewWork()
 }
 
@@ -177,8 +174,7 @@ func (self *Miner) SetExtra(extra []byte) error {
 	if uint64(len(extra)) > params.MaximumExtraDataSize.Uint64() {
 		return fmt.Errorf("Extra exceeds max length. %d > %v", len(extra), params.MaximumExtraDataSize)
 	}
-
+	self.worker.setExtra(extra)
-	self.worker.extra = extra
 	return nil
 }
 

miner/remote_agent.go

@@ -27,6 +27,7 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/logger/glog"
+	"github.com/ethereum/go-ethereum/pow"
 )
 
 type hashrate struct {
@@ -37,10 +38,11 @@ type hashrate struct {
 type RemoteAgent struct {
 	mu sync.Mutex
 
-	quit     chan struct{}
+	quitCh   chan struct{}
 	workCh   chan *Work
 	returnCh chan<- *Result
 
+	pow         pow.PoW
 	currentWork *Work
 	work        map[common.Hash]*Work
 
@@ -50,8 +52,9 @@ type RemoteAgent struct {
 	running int32 // running indicates whether the agent is active. Call atomically
 }
 
-func NewRemoteAgent() *RemoteAgent {
+func NewRemoteAgent(pow pow.PoW) *RemoteAgent {
 	return &RemoteAgent{
+		pow:      pow,
 		work:     make(map[common.Hash]*Work),
 		hashrate: make(map[common.Hash]hashrate),
 	}
@@ -76,18 +79,16 @@ func (a *RemoteAgent) Start() {
 	if !atomic.CompareAndSwapInt32(&a.running, 0, 1) {
 		return
 	}
-
+	a.quitCh = make(chan struct{})
-	a.quit = make(chan struct{})
 	a.workCh = make(chan *Work, 1)
-	go a.maintainLoop()
+	go a.loop(a.workCh, a.quitCh)
 }
 
 func (a *RemoteAgent) Stop() {
 	if !atomic.CompareAndSwapInt32(&a.running, 1, 0) {
 		return
 	}
-
+	close(a.quitCh)
-	close(a.quit)
 	close(a.workCh)
 }
 
@@ -128,35 +129,46 @@ func (a *RemoteAgent) GetWork() ([3]string, error) {
 	return res, errors.New("No work available yet, don't panic.")
 }
 
-// Returns true or false, but does not indicate if the PoW was correct
+// SubmitWork tries to inject a PoW solution tinto the remote agent, returning
+// whether the solution was acceted or not (not can be both a bad PoW as well as
+// any other error, like no work pending).
 func (a *RemoteAgent) SubmitWork(nonce uint64, mixDigest, hash common.Hash) bool {
 	a.mu.Lock()
 	defer a.mu.Unlock()
 
 	// Make sure the work submitted is present
-	if a.work[hash] != nil {
+	work := a.work[hash]
-		block := a.work[hash].Block.WithMiningResult(nonce, mixDigest)
+	if work == nil {
-		a.returnCh <- &Result{a.work[hash], block}
+		glog.V(logger.Info).Infof("Work was submitted for %x but no pending work found", hash)
-
+		return false
-		delete(a.work, hash)
-
-		return true
-	} else {
-		glog.V(logger.Info).Infof("Work was submitted for %x but no pending work found\n", hash)
 	}
+	// Make sure the PoW solutions is indeed valid
+	block := work.Block.WithMiningResult(nonce, mixDigest)
+	if !a.pow.Verify(block) {
+		glog.V(logger.Warn).Infof("Invalid PoW submitted for %x", hash)
+		return false
+	}
+	// Solutions seems to be valid, return to the miner and notify acceptance
+	a.returnCh <- &Result{work, block}
+	delete(a.work, hash)
 
-	return false
+	return true
 }
 
-func (a *RemoteAgent) maintainLoop() {
+// loop monitors mining events on the work and quit channels, updating the internal
+// state of the rmeote miner until a termination is requested.
+//
+// Note, the reason the work and quit channels are passed as parameters is because
+// RemoteAgent.Start() constantly recreates these channels, so the loop code cannot
+// assume data stability in these member fields.
+func (a *RemoteAgent) loop(workCh chan *Work, quitCh chan struct{}) {
 	ticker := time.Tick(5 * time.Second)
 
-out:
 	for {
 		select {
-		case <-a.quit:
+		case <-quitCh:
-			break out
+			return
-		case work := <-a.workCh:
+		case work := <-workCh:
 			a.mu.Lock()
 			a.currentWork = work
 			a.mu.Unlock()

miner/unconfirmed.go

@@ -0,0 +1,118 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package miner
+
+import (
+	"container/ring"
+	"sync"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/logger/glog"
+)
+
+// headerRetriever is used by the unconfirmed block set to verify whether a previously
+// mined block is part of the canonical chain or not.
+type headerRetriever interface {
+	// GetHeaderByNumber retrieves the canonical header associated with a block number.
+	GetHeaderByNumber(number uint64) *types.Header
+}
+
+// unconfirmedBlock is a small collection of metadata about a locally mined block
+// that is placed into a unconfirmed set for canonical chain inclusion tracking.
+type unconfirmedBlock struct {
+	index uint64
+	hash  common.Hash
+}
+
+// unconfirmedBlocks implements a data structure to maintain locally mined blocks
+// have have not yet reached enough maturity to guarantee chain inclusion. It is
+// used by the miner to provide logs to the user when a previously mined block
+// has a high enough guarantee to not be reorged out of te canonical chain.
+type unconfirmedBlocks struct {
+	chain  headerRetriever // Blockchain to verify canonical status through
+	depth  uint            // Depth after which to discard previous blocks
+	blocks *ring.Ring      // Block infos to allow canonical chain cross checks
+	lock   sync.RWMutex    // Protects the fields from concurrent access
+}
+
+// newUnconfirmedBlocks returns new data structure to track currently unconfirmed blocks.
+func newUnconfirmedBlocks(chain headerRetriever, depth uint) *unconfirmedBlocks {
+	return &unconfirmedBlocks{
+		chain: chain,
+		depth: depth,
+	}
+}
+
+// Insert adds a new block to the set of unconfirmed ones.
+func (set *unconfirmedBlocks) Insert(index uint64, hash common.Hash) {
+	// If a new block was mined locally, shift out any old enough blocks
+	set.Shift(index)
+
+	// Create the new item as its own ring
+	item := ring.New(1)
+	item.Value = &unconfirmedBlock{
+		index: index,
+		hash:  hash,
+	}
+	// Set as the initial ring or append to the end
+	set.lock.Lock()
+	defer set.lock.Unlock()
+
+	if set.blocks == nil {
+		set.blocks = item
+	} else {
+		set.blocks.Move(-1).Link(item)
+	}
+	// Display a log for the user to notify of a new mined block unconfirmed
+	glog.V(logger.Info).Infof("🔨  mined potential block #%d [%x…], waiting for %d blocks to confirm", index, hash.Bytes()[:4], set.depth)
+}
+
+// Shift drops all unconfirmed blocks from the set which exceed the unconfirmed sets depth
+// allowance, checking them against the canonical chain for inclusion or staleness
+// report.
+func (set *unconfirmedBlocks) Shift(height uint64) {
+	set.lock.Lock()
+	defer set.lock.Unlock()
+
+	for set.blocks != nil {
+		// Retrieve the next unconfirmed block and abort if too fresh
+		next := set.blocks.Value.(*unconfirmedBlock)
+		if next.index+uint64(set.depth) > height {
+			break
+		}
+		// Block seems to exceed depth allowance, check for canonical status
+		header := set.chain.GetHeaderByNumber(next.index)
+		switch {
+		case header == nil:
+			glog.V(logger.Warn).Infof("failed to retrieve header of mined block #%d [%x…]", next.index, next.hash.Bytes()[:4])
+		case header.Hash() == next.hash:
+			glog.V(logger.Info).Infof("🔗  mined block #%d [%x…] reached canonical chain", next.index, next.hash.Bytes()[:4])
+		default:
+			glog.V(logger.Info).Infof("⑂ mined block #%d [%x…] became a side fork", next.index, next.hash.Bytes()[:4])
+		}
+		// Drop the block out of the ring
+		if set.blocks.Value == set.blocks.Next().Value {
+			set.blocks = nil
+		} else {
+			set.blocks = set.blocks.Move(-1)
+			set.blocks.Unlink(1)
+			set.blocks = set.blocks.Move(1)
+		}
+	}
+}

miner/unconfirmed_test.go

@@ -0,0 +1,85 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package miner
+
+import (
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+)
+
+// noopHeaderRetriever is an implementation of headerRetriever that always
+// returns nil for any requested headers.
+type noopHeaderRetriever struct{}
+
+func (r *noopHeaderRetriever) GetHeaderByNumber(number uint64) *types.Header {
+	return nil
+}
+
+// Tests that inserting blocks into the unconfirmed set accumulates them until
+// the desired depth is reached, after which they begin to be dropped.
+func TestUnconfirmedInsertBounds(t *testing.T) {
+	limit := uint(10)
+
+	pool := newUnconfirmedBlocks(new(noopHeaderRetriever), limit)
+	for depth := uint64(0); depth < 2*uint64(limit); depth++ {
+		// Insert multiple blocks for the same level just to stress it
+		for i := 0; i < int(depth); i++ {
+			pool.Insert(depth, common.Hash([32]byte{byte(depth), byte(i)}))
+		}
+		// Validate that no blocks below the depth allowance are left in
+		pool.blocks.Do(func(block interface{}) {
+			if block := block.(*unconfirmedBlock); block.index+uint64(limit) <= depth {
+				t.Errorf("depth %d: block %x not dropped", depth, block.hash)
+			}
+		})
+	}
+}
+
+// Tests that shifting blocks out of the unconfirmed set works both for normal
+// cases as well as for corner cases such as empty sets, empty shifts or full
+// shifts.
+func TestUnconfirmedShifts(t *testing.T) {
+	// Create a pool with a few blocks on various depths
+	limit, start := uint(10), uint64(25)
+
+	pool := newUnconfirmedBlocks(new(noopHeaderRetriever), limit)
+	for depth := start; depth < start+uint64(limit); depth++ {
+		pool.Insert(depth, common.Hash([32]byte{byte(depth)}))
+	}
+	// Try to shift below the limit and ensure no blocks are dropped
+	pool.Shift(start + uint64(limit) - 1)
+	if n := pool.blocks.Len(); n != int(limit) {
+		t.Errorf("unconfirmed count mismatch: have %d, want %d", n, limit)
+	}
+	// Try to shift half the blocks out and verify remainder
+	pool.Shift(start + uint64(limit) - 1 + uint64(limit/2))
+	if n := pool.blocks.Len(); n != int(limit)/2 {
+		t.Errorf("unconfirmed count mismatch: have %d, want %d", n, limit/2)
+	}
+	// Try to shift all the remaining blocks out and verify emptyness
+	pool.Shift(start + 2*uint64(limit))
+	if n := pool.blocks.Len(); n != 0 {
+		t.Errorf("unconfirmed count mismatch: have %d, want %d", n, 0)
+	}
+	// Try to shift out from the empty set and make sure it doesn't break
+	pool.Shift(start + 3*uint64(limit))
+	if n := pool.blocks.Len(); n != 0 {
+		t.Errorf("unconfirmed count mismatch: have %d, want %d", n, 0)
+	}
+}

miner/worker.go

@@ -55,26 +55,20 @@ type Agent interface {
 	GetHashRate() int64
 }
 
-type uint64RingBuffer struct {
-	ints []uint64 //array of all integers in buffer
-	next int      //where is the next insertion? assert 0 <= next < len(ints)
-}
-
 // Work is the workers current environment and holds
 // all of the current state information
 type Work struct {
 	config *params.ChainConfig
 	signer types.Signer
 
-	state            *state.StateDB // apply state changes here
+	state         *state.StateDB // apply state changes here
-	ancestors        *set.Set       // ancestor set (used for checking uncle parent validity)
+	ancestors     *set.Set       // ancestor set (used for checking uncle parent validity)
-	family           *set.Set       // family set (used for checking uncle invalidity)
+	family        *set.Set       // family set (used for checking uncle invalidity)
-	uncles           *set.Set       // uncle set
+	uncles        *set.Set       // uncle set
-	tcount           int            // tx count in cycle
+	tcount        int            // tx count in cycle
-	ownedAccounts    *set.Set
+	ownedAccounts *set.Set
-	lowGasTxs        types.Transactions
+	lowGasTxs     types.Transactions
-	failedTxs        types.Transactions
+	failedTxs     types.Transactions
-	localMinedBlocks *uint64RingBuffer // the most recent block numbers that were mined locally (used to check block inclusion)
 
 	Block *types.Block // the new block
 
@@ -123,6 +117,8 @@ type worker struct {
 	txQueueMu sync.Mutex
 	txQueue   map[common.Hash]*types.Transaction
 
+	unconfirmed *unconfirmedBlocks // set of locally mined blocks pending canonicalness confirmations
+
 	// atomic status counters
 	mining int32
 	atWork int32
@@ -144,6 +140,7 @@ func newWorker(config *params.ChainConfig, coinbase common.Address, eth Backend,
 		coinbase:       coinbase,
 		txQueue:        make(map[common.Hash]*types.Transaction),
 		agents:         make(map[Agent]struct{}),
+		unconfirmed:    newUnconfirmedBlocks(eth.BlockChain(), 5),
 		fullValidation: false,
 	}
 	worker.events = worker.mux.Subscribe(core.ChainHeadEvent{}, core.ChainSideEvent{}, core.TxPreEvent{})
@@ -161,6 +158,12 @@ func (self *worker) setEtherbase(addr common.Address) {
 	self.coinbase = addr
 }
 
+func (self *worker) setExtra(extra []byte) {
+	self.mu.Lock()
+	defer self.mu.Unlock()
+	self.extra = extra
+}
+
 func (self *worker) pending() (*types.Block, *state.StateDB) {
 	self.currentMu.Lock()
 	defer self.currentMu.Unlock()
@@ -263,18 +266,6 @@ func (self *worker) update() {
 	}
 }
 
-func newLocalMinedBlock(blockNumber uint64, prevMinedBlocks *uint64RingBuffer) (minedBlocks *uint64RingBuffer) {
-	if prevMinedBlocks == nil {
-		minedBlocks = &uint64RingBuffer{next: 0, ints: make([]uint64, miningLogAtDepth+1)}
-	} else {
-		minedBlocks = prevMinedBlocks
-	}
-
-	minedBlocks.ints[minedBlocks.next] = blockNumber
-	minedBlocks.next = (minedBlocks.next + 1) % len(minedBlocks.ints)
-	return minedBlocks
-}
-
 func (self *worker) wait() {
 	for {
 		mustCommitNewWork := true
@@ -349,17 +340,8 @@ func (self *worker) wait() {
 					}
 				}(block, work.state.Logs(), work.receipts)
 			}
-
+			// Insert the block into the set of pending ones to wait for confirmations
-			// check staleness and display confirmation
+			self.unconfirmed.Insert(block.NumberU64(), block.Hash())
-			var stale, confirm string
-			canonBlock := self.chain.GetBlockByNumber(block.NumberU64())
-			if canonBlock != nil && canonBlock.Hash() != block.Hash() {
-				stale = "stale "
-			} else {
-				confirm = "Wait 5 blocks for confirmation"
-				work.localMinedBlocks = newLocalMinedBlock(block.Number().Uint64(), work.localMinedBlocks)
-			}
-			glog.V(logger.Info).Infof("🔨  Mined %sblock (#%v / %x). %s", stale, block.Number(), block.Hash().Bytes()[:4], confirm)
 
 			if mustCommitNewWork {
 				self.commitNewWork()
@@ -411,9 +393,6 @@ func (self *worker) makeCurrent(parent *types.Block, header *types.Header) error
 	// Keep track of transactions which return errors so they can be removed
 	work.tcount = 0
 	work.ownedAccounts = accountAddressesSet(accounts)
-	if self.current != nil {
-		work.localMinedBlocks = self.current.localMinedBlocks
-	}
 	self.current = work
 	return nil
 }
@@ -429,38 +408,6 @@ func (w *worker) setGasPrice(p *big.Int) {
 	w.mux.Post(core.GasPriceChanged{Price: w.gasPrice})
 }
 
-func (self *worker) isBlockLocallyMined(current *Work, deepBlockNum uint64) bool {
-	//Did this instance mine a block at {deepBlockNum} ?
-	var isLocal = false
-	for idx, blockNum := range current.localMinedBlocks.ints {
-		if deepBlockNum == blockNum {
-			isLocal = true
-			current.localMinedBlocks.ints[idx] = 0 //prevent showing duplicate logs
-			break
-		}
-	}
-	//Short-circuit on false, because the previous and following tests must both be true
-	if !isLocal {
-		return false
-	}
-
-	//Does the block at {deepBlockNum} send earnings to my coinbase?
-	var block = self.chain.GetBlockByNumber(deepBlockNum)
-	return block != nil && block.Coinbase() == self.coinbase
-}
-
-func (self *worker) logLocalMinedBlocks(current, previous *Work) {
-	if previous != nil && current.localMinedBlocks != nil {
-		nextBlockNum := current.Block.NumberU64()
-		for checkBlockNum := previous.Block.NumberU64(); checkBlockNum < nextBlockNum; checkBlockNum++ {
-			inspectBlockNum := checkBlockNum - miningLogAtDepth
-			if self.isBlockLocallyMined(current, inspectBlockNum) {
-				glog.V(logger.Info).Infof("🔨 🔗  Mined %d blocks back: block #%v", miningLogAtDepth, inspectBlockNum)
-			}
-		}
-	}
-}
-
 func (self *worker) commitNewWork() {
 	self.mu.Lock()
 	defer self.mu.Unlock()
@@ -507,7 +454,6 @@ func (self *worker) commitNewWork() {
 			}
 		}
 	}
-	previous := self.current
 	// Could potentially happen if starting to mine in an odd state.
 	err := self.makeCurrent(parent, header)
 	if err != nil {
@@ -519,7 +465,14 @@ func (self *worker) commitNewWork() {
 	if self.config.DAOForkSupport && self.config.DAOForkBlock != nil && self.config.DAOForkBlock.Cmp(header.Number) == 0 {
 		core.ApplyDAOHardFork(work.state)
 	}
-	txs := types.NewTransactionsByPriceAndNonce(self.eth.TxPool().Pending())
+
+	pending, err := self.eth.TxPool().Pending()
+	if err != nil {
+		glog.Errorf("Could not fetch pending transactions: %v", err)
+		return
+	}
+
+	txs := types.NewTransactionsByPriceAndNonce(pending)
 	work.commitTransactions(self.mux, txs, self.gasPrice, self.chain)
 
 	self.eth.TxPool().RemoveBatch(work.lowGasTxs)
@@ -561,7 +514,7 @@ func (self *worker) commitNewWork() {
 	// We only care about logging if we're actually mining.
 	if atomic.LoadInt32(&self.mining) == 1 {
 		glog.V(logger.Info).Infof("commit new work on block %v with %d txs & %d uncles. Took %v\n", work.Block.Number(), work.tcount, len(uncles), time.Since(tstart))
-		self.logLocalMinedBlocks(work, previous)
+		self.unconfirmed.Shift(work.Block.NumberU64() - 1)
 	}
 	self.push(work)
 }

mobile/params.go

@@ -50,7 +50,7 @@ func TestnetChainConfig() *ChainConfig {
 		ChainID:        params.TestNetChainID.Int64(),
 		HomesteadBlock: params.TestNetHomesteadBlock.Int64(),
 		DAOForkBlock:   0,
-		DAOForkSupport: true,
+		DAOForkSupport: false,
 		EIP150Block:    params.TestNetHomesteadGasRepriceBlock.Int64(),
 		EIP150Hash:     Hash{params.TestNetHomesteadGasRepriceHash},
 		EIP155Block:    params.TestNetSpuriousDragon.Int64(),

p2p/discover/udp_test.go

@@ -374,7 +374,7 @@ func TestUDP_successfulPing(t *testing.T) {
 		if n.ID != rid {
 			t.Errorf("node has wrong ID: got %v, want %v", n.ID, rid)
 		}
-		if !bytes.Equal(n.IP, test.remoteaddr.IP) {
+		if !n.IP.Equal(test.remoteaddr.IP) {
 			t.Errorf("node has wrong IP: got %v, want: %v", n.IP, test.remoteaddr.IP)
 		}
 		if int(n.UDP) != test.remoteaddr.Port {

p2p/discv5/net.go

@@ -126,8 +126,15 @@ type topicRegisterReq struct {
 }
 
 type topicSearchReq struct {
-	topic Topic
+	topic  Topic
-	found chan<- string
+	found  chan<- *Node
+	lookup chan<- bool
+	delay  time.Duration
+}
+
+type topicSearchResult struct {
+	target lookupInfo
+	nodes  []*Node
 }
 
 type timeoutEvent struct {
@@ -263,16 +270,23 @@ func (net *Network) lookup(target common.Hash, stopOnMatch bool) []*Node {
 			break
 		}
 		// Wait for the next reply.
-		for _, n := range <-reply {
+		select {
-			if n != nil && !seen[n.ID] {
+		case nodes := <-reply:
-				seen[n.ID] = true
+			for _, n := range nodes {
-				result.push(n, bucketSize)
+				if n != nil && !seen[n.ID] {
-				if stopOnMatch && n.sha == target {
+					seen[n.ID] = true
-					return result.entries
+					result.push(n, bucketSize)
+					if stopOnMatch && n.sha == target {
+						return result.entries
+					}
 				}
 			}
+			pendingQueries--
+		case <-time.After(respTimeout):
+			// forget all pending requests, start new ones
+			pendingQueries = 0
+			reply = make(chan []*Node, alpha)
 		}
-		pendingQueries--
 	}
 	return result.entries
 }
@@ -293,18 +307,20 @@ func (net *Network) RegisterTopic(topic Topic, stop <-chan struct{}) {
 	}
 }
 
-func (net *Network) SearchTopic(topic Topic, stop <-chan struct{}, found chan<- string) {
+func (net *Network) SearchTopic(topic Topic, setPeriod <-chan time.Duration, found chan<- *Node, lookup chan<- bool) {
-	select {
+	for {
-	case net.topicSearchReq <- topicSearchReq{topic, found}:
-	case <-net.closed:
-		return
-	}
-	select {
-	case <-net.closed:
-	case <-stop:
 		select {
-		case net.topicSearchReq <- topicSearchReq{topic, nil}:
 		case <-net.closed:
+			return
+		case delay, ok := <-setPeriod:
+			select {
+			case net.topicSearchReq <- topicSearchReq{topic: topic, found: found, lookup: lookup, delay: delay}:
+			case <-net.closed:
+				return
+			}
+			if !ok {
+				return
+			}
 		}
 	}
 }
@@ -347,6 +363,13 @@ func (net *Network) reqTableOp(f func()) (called bool) {
 
 // TODO: external address handling.
 
+type topicSearchInfo struct {
+	lookupChn chan<- bool
+	period    time.Duration
+}
+
+const maxSearchCount = 5
+
 func (net *Network) loop() {
 	var (
 		refreshTimer       = time.NewTicker(autoRefreshInterval)
@@ -385,10 +408,12 @@ func (net *Network) loop() {
 		topicRegisterLookupTarget lookupInfo
 		topicRegisterLookupDone   chan []*Node
 		topicRegisterLookupTick   = time.NewTimer(0)
-		topicSearchLookupTarget   lookupInfo
 		searchReqWhenRefreshDone  []topicSearchReq
+		searchInfo                = make(map[Topic]topicSearchInfo)
+		activeSearchCount         int
 	)
-	topicSearchLookupDone := make(chan []*Node, 1)
+	topicSearchLookupDone := make(chan topicSearchResult, 100)
+	topicSearch := make(chan Topic, 100)
 	<-topicRegisterLookupTick.C
 
 	statsDump := time.NewTicker(10 * time.Second)
@@ -504,21 +529,52 @@ loop:
 		case req := <-net.topicSearchReq:
 			if refreshDone == nil {
 				debugLog("<-net.topicSearchReq")
-				if req.found == nil {
+				info, ok := searchInfo[req.topic]
-					net.ticketStore.removeSearchTopic(req.topic)
+				if ok {
+					if req.delay == time.Duration(0) {
+						delete(searchInfo, req.topic)
+						net.ticketStore.removeSearchTopic(req.topic)
+					} else {
+						info.period = req.delay
+						searchInfo[req.topic] = info
+					}
 					continue
 				}
-				net.ticketStore.addSearchTopic(req.topic, req.found)
+				if req.delay != time.Duration(0) {
-				if (topicSearchLookupTarget.target == common.Hash{}) {
+					var info topicSearchInfo
-					topicSearchLookupDone <- nil
+					info.period = req.delay
+					info.lookupChn = req.lookup
+					searchInfo[req.topic] = info
+					net.ticketStore.addSearchTopic(req.topic, req.found)
+					topicSearch <- req.topic
 				}
 			} else {
 				searchReqWhenRefreshDone = append(searchReqWhenRefreshDone, req)
 			}
 
-		case nodes := <-topicSearchLookupDone:
+		case topic := <-topicSearch:
-			debugLog("<-topicSearchLookupDone")
+			if activeSearchCount < maxSearchCount {
-			net.ticketStore.searchLookupDone(topicSearchLookupTarget, nodes, func(n *Node) []byte {
+				activeSearchCount++
+				target := net.ticketStore.nextSearchLookup(topic)
+				go func() {
+					nodes := net.lookup(target.target, false)
+					topicSearchLookupDone <- topicSearchResult{target: target, nodes: nodes}
+				}()
+			}
+			period := searchInfo[topic].period
+			if period != time.Duration(0) {
+				go func() {
+					time.Sleep(period)
+					topicSearch <- topic
+				}()
+			}
+
+		case res := <-topicSearchLookupDone:
+			activeSearchCount--
+			if lookupChn := searchInfo[res.target.topic].lookupChn; lookupChn != nil {
+				lookupChn <- net.ticketStore.radius[res.target.topic].converged
+			}
+			net.ticketStore.searchLookupDone(res.target, res.nodes, func(n *Node) []byte {
 				net.ping(n, n.addr())
 				return n.pingEcho
 			}, func(n *Node, topic Topic) []byte {
@@ -531,11 +587,6 @@ loop:
 					return nil
 				}
 			})
-			topicSearchLookupTarget = net.ticketStore.nextSearchLookup()
-			target := topicSearchLookupTarget.target
-			if (target != common.Hash{}) {
-				go func() { topicSearchLookupDone <- net.lookup(target, false) }()
-			}
 
 		case <-statsDump.C:
 			debugLog("<-statsDump.C")
@@ -708,7 +759,7 @@ func (net *Network) internNodeFromNeighbours(sender *net.UDPAddr, rn rpcNode) (n
 		}
 		return n, err
 	}
-	if !bytes.Equal(n.IP, rn.IP) || n.UDP != rn.UDP || n.TCP != rn.TCP {
+	if !n.IP.Equal(rn.IP) || n.UDP != rn.UDP || n.TCP != rn.TCP {
 		err = fmt.Errorf("metadata mismatch: got %v, want %v", rn, n)
 	}
 	return n, err

p2p/discv5/node.go

@@ -17,7 +17,6 @@
 package discv5
 
 import (
-	"bytes"
 	"crypto/ecdsa"
 	"crypto/elliptic"
 	"encoding/hex"
@@ -81,7 +80,7 @@ func (n *Node) addrEqual(a *net.UDPAddr) bool {
 	if ipv4 := a.IP.To4(); ipv4 != nil {
 		ip = ipv4
 	}
-	return n.UDP == uint16(a.Port) && bytes.Equal(n.IP, ip)
+	return n.UDP == uint16(a.Port) && n.IP.Equal(ip)
 }
 
 // Incomplete returns true for nodes with no IP address.

p2p/discv5/ticket.go

@@ -138,16 +138,12 @@ type ticketStore struct {
 	nextTicketReg     mclock.AbsTime
 
 	searchTopicMap        map[Topic]searchTopic
-	searchTopicList       []Topic
-	searchTopicPtr        int
 	nextTopicQueryCleanup mclock.AbsTime
 	queriesSent           map[*Node]map[common.Hash]sentQuery
-	radiusLookupCnt       int
 }
 
 type searchTopic struct {
-	foundChn chan<- string
+	foundChn chan<- *Node
-	listIdx  int
 }
 
 type sentQuery struct {
@@ -183,23 +179,15 @@ func (s *ticketStore) addTopic(t Topic, register bool) {
 	}
 }
 
-func (s *ticketStore) addSearchTopic(t Topic, foundChn chan<- string) {
+func (s *ticketStore) addSearchTopic(t Topic, foundChn chan<- *Node) {
 	s.addTopic(t, false)
 	if s.searchTopicMap[t].foundChn == nil {
-		s.searchTopicList = append(s.searchTopicList, t)
+		s.searchTopicMap[t] = searchTopic{foundChn: foundChn}
-		s.searchTopicMap[t] = searchTopic{foundChn: foundChn, listIdx: len(s.searchTopicList) - 1}
 	}
 }
 
 func (s *ticketStore) removeSearchTopic(t Topic) {
 	if st := s.searchTopicMap[t]; st.foundChn != nil {
-		lastIdx := len(s.searchTopicList) - 1
-		lastTopic := s.searchTopicList[lastIdx]
-		s.searchTopicList[st.listIdx] = lastTopic
-		sl := s.searchTopicMap[lastTopic]
-		sl.listIdx = st.listIdx
-		s.searchTopicMap[lastTopic] = sl
-		s.searchTopicList = s.searchTopicList[:lastIdx]
 		delete(s.searchTopicMap, t)
 	}
 }
@@ -247,20 +235,13 @@ func (s *ticketStore) nextRegisterLookup() (lookup lookupInfo, delay time.Durati
 	return lookupInfo{}, 40 * time.Second
 }
 
-func (s *ticketStore) nextSearchLookup() lookupInfo {
+func (s *ticketStore) nextSearchLookup(topic Topic) lookupInfo {
-	if len(s.searchTopicList) == 0 {
+	tr := s.radius[topic]
-		return lookupInfo{}
+	target := tr.nextTarget(tr.radiusLookupCnt >= searchForceQuery)
-	}
-	if s.searchTopicPtr >= len(s.searchTopicList) {
-		s.searchTopicPtr = 0
-	}
-	topic := s.searchTopicList[s.searchTopicPtr]
-	s.searchTopicPtr++
-	target := s.radius[topic].nextTarget(s.radiusLookupCnt >= searchForceQuery)
 	if target.radiusLookup {
-		s.radiusLookupCnt++
+		tr.radiusLookupCnt++
 	} else {
-		s.radiusLookupCnt = 0
+		tr.radiusLookupCnt = 0
 	}
 	return target
 }
@@ -662,9 +643,9 @@ func (s *ticketStore) gotTopicNodes(from *Node, hash common.Hash, nodes []rpcNod
 		if ip.IsUnspecified() || ip.IsLoopback() {
 			ip = from.IP
 		}
-		enode := NewNode(node.ID, ip, node.UDP-1, node.TCP-1).String() // subtract one from port while discv5 is running in test mode on UDPport+1
+		n := NewNode(node.ID, ip, node.UDP-1, node.TCP-1) // subtract one from port while discv5 is running in test mode on UDPport+1
 		select {
-		case chn <- enode:
+		case chn <- n:
 		default:
 			return false
 		}
@@ -677,6 +658,8 @@ type topicRadius struct {
 	topicHashPrefix   uint64
 	radius, minRadius uint64
 	buckets           []topicRadiusBucket
+	converged         bool
+	radiusLookupCnt   int
 }
 
 type topicRadiusEvent int
@@ -706,7 +689,7 @@ func (b *topicRadiusBucket) update(now mclock.AbsTime) {
 	b.lastTime = now
 
 	for target, tm := range b.lookupSent {
-		if now-tm > mclock.AbsTime(pingTimeout) {
+		if now-tm > mclock.AbsTime(respTimeout) {
 			b.weights[trNoAdjust] += 1
 			delete(b.lookupSent, target)
 		}
@@ -906,6 +889,7 @@ func (r *topicRadius) recalcRadius() (radius uint64, radiusLookup int) {
 
 	if radiusLookup == -1 {
 		// no more radius lookups needed at the moment, return a radius
+		r.converged = true
 		rad := maxBucket
 		if minRadBucket < rad {
 			rad = minRadBucket

p2p/discv5/udp.go

@@ -196,7 +196,7 @@ func makeEndpoint(addr *net.UDPAddr, tcpPort uint16) rpcEndpoint {
 }
 
 func (e1 rpcEndpoint) equal(e2 rpcEndpoint) bool {
-	return e1.UDP == e2.UDP && e1.TCP == e2.TCP && bytes.Equal(e1.IP, e2.IP)
+	return e1.UDP == e2.UDP && e1.TCP == e2.TCP && e1.IP.Equal(e2.IP)
 }
 
 func nodeFromRPC(sender *net.UDPAddr, rn rpcNode) (*Node, error) {

p2p/nat/nat_test.go

@@ -17,7 +17,6 @@
 package nat
 
 import (
-	"bytes"
 	"net"
 	"testing"
 	"time"
@@ -56,7 +55,7 @@ func TestAutoDiscRace(t *testing.T) {
 				t.Errorf("result %d: unexpected error: %v", i, rval.err)
 			}
 			wantIP := net.IP{33, 44, 55, 66}
-			if !bytes.Equal(rval.ip, wantIP) {
+			if !rval.ip.Equal(wantIP) {
 				t.Errorf("result %d: got IP %v, want %v", i, rval.ip, wantIP)
 			}
 		}

params/version.go

@@ -21,7 +21,7 @@ import "fmt"
 const (
 	VersionMajor = 1          // Major version component of the current release
 	VersionMinor = 5          // Minor version component of the current release
-	VersionPatch = 5          // Patch version component of the current release
+	VersionPatch = 6          // Patch version component of the current release
 	VersionMeta  = "unstable" // Version metadata to append to the version string
 )
 

swarm/network/protocol.go

@@ -51,7 +51,7 @@ const (
 	Version            = 0
 	ProtocolLength     = uint64(8)
 	ProtocolMaxMsgSize = 10 * 1024 * 1024
-	NetworkId          = 322
+	NetworkId          = 3
 )
 
 const (

whisper/shhapi/api.go

@@ -55,6 +55,22 @@ func APIs() []rpc.API {
 	}
 }
 
+// Start starts the Whisper worker threads.
+func (api *PublicWhisperAPI) Start() error {
+	if api.whisper == nil {
+		return whisperOffLineErr
+	}
+	return api.whisper.Start(nil)
+}
+
+// Stop stops the Whisper worker threads.
+func (api *PublicWhisperAPI) Stop() error {
+	if api.whisper == nil {
+		return whisperOffLineErr
+	}
+	return api.whisper.Stop()
+}
+
 // Version returns the Whisper version this node offers.
 func (api *PublicWhisperAPI) Version() (*rpc.HexNumber, error) {
 	if api.whisper == nil {

whisper/shhapi/api_test.go

@@ -277,6 +277,9 @@ func TestIntegrationAsym(t *testing.T) {
 		t.Fatalf("failed to create API.")
 	}
 
+	api.Start()
+	defer api.Stop()
+
 	sig, err := api.NewIdentity()
 	if err != nil {
 		t.Fatalf("failed NewIdentity: %s.", err)
@@ -375,6 +378,9 @@ func TestIntegrationSym(t *testing.T) {
 		t.Fatalf("failed to create API.")
 	}
 
+	api.Start()
+	defer api.Stop()
+
 	keyname := "schluessel"
 	err := api.GenerateSymKey(keyname)
 	if err != nil {
@@ -471,6 +477,9 @@ func TestIntegrationSymWithFilter(t *testing.T) {
 		t.Fatalf("failed to create API.")
 	}
 
+	api.Start()
+	defer api.Stop()
+
 	keyname := "schluessel"
 	err := api.GenerateSymKey(keyname)
 	if err != nil {

whisper/whisperv5/doc.go

@@ -15,9 +15,7 @@
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
 
 /*
-Package whisper implements the Whisper PoC-1.
+Package whisper implements the Whisper protocol (version 5).
-
-(https://github.com/ethereum/wiki/wiki/Whisper-PoC-1-Protocol-Spec)
 
 Whisper combines aspects of both DHTs and datagram messaging systems (e.g. UDP).
 As such it may be likened and compared to both, not dissimilar to the
@@ -42,11 +40,11 @@ const (
 	ProtocolVersionStr = "5.0"
 	ProtocolName       = "shh"
 
-	statusCode           = 0
+	statusCode           = 0 // used by whisper protocol
-	messagesCode         = 1
+	messagesCode         = 1 // normal whisper message
-	p2pCode              = 2
+	p2pCode              = 2 // peer-to-peer message (to be consumed by the peer, but not forwarded any futher)
-	mailRequestCode      = 3
+	p2pRequestCode       = 3 // peer-to-peer message, used by Dapp protocol
-	NumberOfMessageCodes = 32
+	NumberOfMessageCodes = 64
 
 	paddingMask   = byte(3)
 	signatureFlag = byte(4)
@@ -57,11 +55,12 @@ const (
 	saltLength        = 12
 	AESNonceMaxLength = 12
 
-	MaxMessageLength = 0xFFFF // todo: remove this restriction after testing in morden and analizing stats. this should be regulated by MinimumPoW.
+	MaxMessageLength = 0xFFFF // todo: remove this restriction after testing. this should be regulated by PoW.
-	MinimumPoW       = 10.0   // todo: review
+	MinimumPoW       = 1.0    // todo: review after testing.
 
 	padSizeLimitLower = 128 // it can not be less - we don't want to reveal the absence of signature
 	padSizeLimitUpper = 256 // just an arbitrary number, could be changed without losing compatibility
+	messageQueueLimit = 1024
 
 	expirationCycle   = time.Second
 	transmissionCycle = 300 * time.Millisecond

whisper/whisperv5/envelope.go

@@ -14,14 +14,14 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
 
-// Contains the Whisper protocol Envelope element. For formal details please see
+// Contains the Whisper protocol Envelope element.
-// the specs at https://github.com/ethereum/wiki/wiki/Whisper-PoC-1-Protocol-Spec#envelopes.
 
 package whisperv5
 
 import (
 	"crypto/ecdsa"
 	"encoding/binary"
+	"errors"
 	"fmt"
 	"math"
 	"time"
@@ -86,8 +86,8 @@ func (e *Envelope) Ver() uint64 {
 
 // Seal closes the envelope by spending the requested amount of time as a proof
 // of work on hashing the data.
-func (e *Envelope) Seal(options *MessageParams) {
+func (e *Envelope) Seal(options *MessageParams) error {
-	var target int
+	var target, bestBit int
 	if options.PoW == 0 {
 		// adjust for the duration of Seal() execution only if execution time is predefined unconditionally
 		e.Expiry += options.WorkTime
@@ -99,7 +99,7 @@ func (e *Envelope) Seal(options *MessageParams) {
 	h := crypto.Keccak256(e.rlpWithoutNonce())
 	copy(buf[:32], h)
 
-	finish, bestBit := time.Now().Add(time.Duration(options.WorkTime)*time.Second).UnixNano(), 0
+	finish := time.Now().Add(time.Duration(options.WorkTime) * time.Second).UnixNano()
 	for nonce := uint64(0); time.Now().UnixNano() < finish; {
 		for i := 0; i < 1024; i++ {
 			binary.BigEndian.PutUint64(buf[56:], nonce)
@@ -108,12 +108,18 @@ func (e *Envelope) Seal(options *MessageParams) {
 			if firstBit > bestBit {
 				e.EnvNonce, bestBit = nonce, firstBit
 				if target > 0 && bestBit >= target {
-					return
+					return nil
 				}
 			}
 			nonce++
 		}
 	}
+
+	if target > 0 && bestBit < target {
+		return errors.New("Failed to reach the PoW target")
+	}
+
+	return nil
 }
 
 func (e *Envelope) PoW() float64 {

whisper/whisperv5/filter.go

@@ -21,6 +21,8 @@ import (
 	"sync"
 
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/logger/glog"
 )
 
 type Filter struct {
@@ -75,11 +77,12 @@ func (fs *Filters) Get(i uint32) *Filter {
 	return fs.watchers[i]
 }
 
-func (fs *Filters) NotifyWatchers(env *Envelope, messageCode uint64) {
+func (fs *Filters) NotifyWatchers(env *Envelope, p2pMessage bool) {
 	fs.mutex.RLock()
 	var msg *ReceivedMessage
-	for _, watcher := range fs.watchers {
+	for j, watcher := range fs.watchers {
-		if messageCode == p2pCode && !watcher.AcceptP2P {
+		if p2pMessage && !watcher.AcceptP2P {
+			glog.V(logger.Detail).Infof("msg [%x], filter [%d]: p2p messages are not allowed \n", env.Hash(), j)
 			continue
 		}
 
@@ -90,6 +93,11 @@ func (fs *Filters) NotifyWatchers(env *Envelope, messageCode uint64) {
 			match = watcher.MatchEnvelope(env)
 			if match {
 				msg = env.Open(watcher)
+				if msg == nil {
+					glog.V(logger.Detail).Infof("msg [%x], filter [%d]: failed to open \n", env.Hash(), j)
+				}
+			} else {
+				glog.V(logger.Detail).Infof("msg [%x], filter [%d]: does not match \n", env.Hash(), j)
 			}
 		}
 
@@ -137,12 +145,12 @@ func (f *Filter) MatchMessage(msg *ReceivedMessage) bool {
 	if f.PoW > 0 && msg.PoW < f.PoW {
 		return false
 	}
-	if f.Src != nil && !isPubKeyEqual(msg.Src, f.Src) {
+	if f.Src != nil && !IsPubKeyEqual(msg.Src, f.Src) {
 		return false
 	}
 
 	if f.expectsAsymmetricEncryption() && msg.isAsymmetricEncryption() {
-		return isPubKeyEqual(&f.KeyAsym.PublicKey, msg.Dst) && f.MatchTopic(msg.Topic)
+		return IsPubKeyEqual(&f.KeyAsym.PublicKey, msg.Dst) && f.MatchTopic(msg.Topic)
 	} else if f.expectsSymmetricEncryption() && msg.isSymmetricEncryption() {
 		return f.SymKeyHash == msg.SymKeyHash && f.MatchTopic(msg.Topic)
 	}
@@ -176,7 +184,7 @@ func (f *Filter) MatchTopic(topic TopicType) bool {
 	return false
 }
 
-func isPubKeyEqual(a, b *ecdsa.PublicKey) bool {
+func IsPubKeyEqual(a, b *ecdsa.PublicKey) bool {
 	if !ValidatePublicKey(a) {
 		return false
 	} else if !ValidatePublicKey(b) {

whisper/whisperv5/filter_test.go

@@ -139,7 +139,7 @@ func TestComparePubKey(t *testing.T) {
 	if err != nil {
 		t.Fatalf("failed to generate second key with seed %d: %s.", seed, err)
 	}
-	if isPubKeyEqual(&key1.PublicKey, &key2.PublicKey) {
+	if IsPubKeyEqual(&key1.PublicKey, &key2.PublicKey) {
 		t.Fatalf("public keys are equal, seed %d.", seed)
 	}
 
@@ -149,7 +149,7 @@ func TestComparePubKey(t *testing.T) {
 	if err != nil {
 		t.Fatalf("failed to generate third key with seed %d: %s.", seed, err)
 	}
-	if isPubKeyEqual(&key1.PublicKey, &key3.PublicKey) {
+	if IsPubKeyEqual(&key1.PublicKey, &key3.PublicKey) {
 		t.Fatalf("key1 == key3, seed %d.", seed)
 	}
 }
@@ -540,7 +540,7 @@ func TestWatchers(t *testing.T) {
 	}
 
 	for i = 0; i < NumMessages; i++ {
-		filters.NotifyWatchers(envelopes[i], messagesCode)
+		filters.NotifyWatchers(envelopes[i], false)
 	}
 
 	var total int
@@ -593,7 +593,7 @@ func TestWatchers(t *testing.T) {
 	}
 
 	for i = 0; i < NumMessages; i++ {
-		filters.NotifyWatchers(envelopes[i], messagesCode)
+		filters.NotifyWatchers(envelopes[i], false)
 	}
 
 	for i = 0; i < NumFilters; i++ {
@@ -629,7 +629,7 @@ func TestWatchers(t *testing.T) {
 	// test AcceptP2P
 
 	total = 0
-	filters.NotifyWatchers(envelopes[0], p2pCode)
+	filters.NotifyWatchers(envelopes[0], true)
 
 	for i = 0; i < NumFilters; i++ {
 		mail = tst[i].f.Retrieve()
@@ -646,7 +646,7 @@ func TestWatchers(t *testing.T) {
 	}
 	f.AcceptP2P = true
 	total = 0
-	filters.NotifyWatchers(envelopes[0], p2pCode)
+	filters.NotifyWatchers(envelopes[0], true)
 
 	for i = 0; i < NumFilters; i++ {
 		mail = tst[i].f.Retrieve()

whisper/whisperv5/message.go

@@ -14,9 +14,7 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
 
-// Contains the Whisper protocol Message element. For formal details please see
+// Contains the Whisper protocol Message element.
-// the specs at https://github.com/ethereum/wiki/wiki/Whisper-PoC-1-Protocol-Spec#messages.
-// todo: fix the spec link, and move it to doc.go
 
 package whisperv5
 
@@ -256,7 +254,11 @@ func (msg *SentMessage) Wrap(options *MessageParams) (envelope *Envelope, err er
 	}
 
 	envelope = NewEnvelope(options.TTL, options.Topic, salt, nonce, msg)
-	envelope.Seal(options)
+	err = envelope.Seal(options)
+	if err != nil {
+		return nil, err
+	}
+
 	return envelope, nil
 }
 

whisper/whisperv5/message_test.go

@@ -30,11 +30,15 @@ func copyFromBuf(dst []byte, src []byte, beg int) int {
 }
 
 func generateMessageParams() (*MessageParams, error) {
+	// set all the parameters except p.Dst
+
 	buf := make([]byte, 1024)
 	randomize(buf)
 	sz := rand.Intn(400)
 
 	var p MessageParams
+	p.PoW = 0.01
+	p.WorkTime = 1
 	p.TTL = uint32(rand.Intn(1024))
 	p.Payload = make([]byte, sz)
 	p.Padding = make([]byte, padSizeLimitUpper)
@@ -52,8 +56,6 @@ func generateMessageParams() (*MessageParams, error) {
 		return nil, err
 	}
 
-	// p.Dst, p.PoW, p.WorkTime are not set
-	p.PoW = 0.01
 	return &p, nil
 }
 
@@ -114,7 +116,7 @@ func singleMessageTest(t *testing.T, symmetric bool) {
 	if len(decrypted.Signature) != signatureLength {
 		t.Fatalf("failed with seed %d: signature len %d.", seed, len(decrypted.Signature))
 	}
-	if !isPubKeyEqual(decrypted.Src, &params.Src.PublicKey) {
+	if !IsPubKeyEqual(decrypted.Src, &params.Src.PublicKey) {
 		t.Fatalf("failed with seed %d: signature mismatch.", seed)
 	}
 }
@@ -152,6 +154,16 @@ func TestMessageWrap(t *testing.T) {
 	if pow < target {
 		t.Fatalf("failed Wrap with seed %d: pow < target (%f vs. %f).", seed, pow, target)
 	}
+
+	// set PoW target too high, expect error
+	msg2 := NewSentMessage(params)
+	params.TTL = 1000000
+	params.WorkTime = 1
+	params.PoW = 10000000.0
+	env, err = msg2.Wrap(params)
+	if err == nil {
+		t.Fatalf("unexpectedly reached the PoW target with seed %d.", seed)
+	}
 }
 
 func TestMessageSeal(t *testing.T) {
@@ -256,7 +268,7 @@ func singleEnvelopeOpenTest(t *testing.T, symmetric bool) {
 	if len(decrypted.Signature) != signatureLength {
 		t.Fatalf("failed with seed %d: signature len %d.", seed, len(decrypted.Signature))
 	}
-	if !isPubKeyEqual(decrypted.Src, &params.Src.PublicKey) {
+	if !IsPubKeyEqual(decrypted.Src, &params.Src.PublicKey) {
 		t.Fatalf("failed with seed %d: signature mismatch.", seed)
 	}
 	if decrypted.isAsymmetricEncryption() == symmetric {
@@ -269,8 +281,37 @@ func singleEnvelopeOpenTest(t *testing.T, symmetric bool) {
 		if decrypted.Dst == nil {
 			t.Fatalf("failed with seed %d: dst is nil.", seed)
 		}
-		if !isPubKeyEqual(decrypted.Dst, &key.PublicKey) {
+		if !IsPubKeyEqual(decrypted.Dst, &key.PublicKey) {
 			t.Fatalf("failed with seed %d: Dst.", seed)
 		}
 	}
 }
+
+func TestEncryptWithZeroKey(t *testing.T) {
+	InitSingleTest()
+
+	params, err := generateMessageParams()
+	if err != nil {
+		t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
+	}
+
+	msg := NewSentMessage(params)
+
+	params.KeySym = make([]byte, aesKeyLength)
+	_, err = msg.Wrap(params)
+	if err == nil {
+		t.Fatalf("wrapped with zero key, seed: %d.", seed)
+	}
+
+	params.KeySym = make([]byte, 0)
+	_, err = msg.Wrap(params)
+	if err == nil {
+		t.Fatalf("wrapped with empty key, seed: %d.", seed)
+	}
+
+	params.KeySym = nil
+	_, err = msg.Wrap(params)
+	if err == nil {
+		t.Fatalf("wrapped with nil key, seed: %d.", seed)
+	}
+}

whisper/whisperv5/peer_test.go

@@ -118,6 +118,7 @@ func initialize(t *testing.T) {
 		var node TestNode
 		node.shh = NewWhisper(nil)
 		node.shh.test = true
+		node.shh.Start(nil)
 		topics := make([]TopicType, 0)
 		topics = append(topics, sharedTopic)
 		f := Filter{KeySym: sharedKey, Topics: topics}
@@ -166,6 +167,7 @@ func stopServers() {
 		n := nodes[i]
 		if n != nil {
 			n.shh.Unwatch(n.filerId)
+			n.shh.Stop()
 			n.server.Stop()
 		}
 	}

whisper/whisperv5/topic.go

@@ -14,8 +14,7 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
 
-// Contains the Whisper protocol Topic element. For formal details please see
+// Contains the Whisper protocol Topic element.
-// the specs at https://github.com/ethereum/wiki/wiki/Whisper-PoC-1-Protocol-Spec#topics.
 
 package whisperv5
 

whisper/whisperv5/whisper.go

@@ -22,6 +22,7 @@ import (
 	crand "crypto/rand"
 	"crypto/sha256"
 	"fmt"
+	"runtime"
 	"sync"
 	"time"
 
@@ -45,7 +46,7 @@ type Whisper struct {
 	symKeys     map[string][]byte
 	keyMu       sync.RWMutex
 
-	envelopes   map[common.Hash]*Envelope        // Pool of messages currently tracked by this node
+	envelopes   map[common.Hash]*Envelope        // Pool of envelopes currently tracked by this node
 	messages    map[common.Hash]*ReceivedMessage // Pool of successfully decrypted messages, which are not expired yet
 	expirations map[uint32]*set.SetNonTS         // Message expiration pool
 	poolMu      sync.RWMutex                     // Mutex to sync the message and expiration pools
@@ -55,22 +56,28 @@ type Whisper struct {
 
 	mailServer MailServer
 
-	quit chan struct{}
+	messageQueue chan *Envelope
-	test bool
+	p2pMsgQueue  chan *Envelope
+	quit         chan struct{}
+
+	overflow bool
+	test     bool
 }
 
 // New creates a Whisper client ready to communicate through the Ethereum P2P network.
 // Param s should be passed if you want to implement mail server, otherwise nil.
 func NewWhisper(server MailServer) *Whisper {
 	whisper := &Whisper{
-		privateKeys: make(map[string]*ecdsa.PrivateKey),
+		privateKeys:  make(map[string]*ecdsa.PrivateKey),
-		symKeys:     make(map[string][]byte),
+		symKeys:      make(map[string][]byte),
-		envelopes:   make(map[common.Hash]*Envelope),
+		envelopes:    make(map[common.Hash]*Envelope),
-		messages:    make(map[common.Hash]*ReceivedMessage),
+		messages:     make(map[common.Hash]*ReceivedMessage),
-		expirations: make(map[uint32]*set.SetNonTS),
+		expirations:  make(map[uint32]*set.SetNonTS),
-		peers:       make(map[*Peer]struct{}),
+		peers:        make(map[*Peer]struct{}),
-		mailServer:  server,
+		mailServer:   server,
-		quit:        make(chan struct{}),
+		messageQueue: make(chan *Envelope, messageQueueLimit),
+		p2pMsgQueue:  make(chan *Envelope, messageQueueLimit),
+		quit:         make(chan struct{}),
 	}
 	whisper.filters = NewFilters(whisper)
 
@@ -124,7 +131,7 @@ func (w *Whisper) RequestHistoricMessages(peerID []byte, data []byte) error {
 		return err
 	}
 	p.trusted = true
-	return p2p.Send(p.ws, mailRequestCode, data)
+	return p2p.Send(p.ws, p2pRequestCode, data)
 }
 
 func (w *Whisper) SendP2PMessage(peerID []byte, envelope *Envelope) error {
@@ -270,6 +277,12 @@ func (w *Whisper) Send(envelope *Envelope) error {
 func (w *Whisper) Start(*p2p.Server) error {
 	glog.V(logger.Info).Infoln("Whisper started")
 	go w.update()
+
+	numCPU := runtime.NumCPU()
+	for i := 0; i < numCPU; i++ {
+		go w.processQueue()
+	}
+
 	return nil
 }
 
@@ -350,10 +363,10 @@ func (wh *Whisper) runMessageLoop(p *Peer, rw p2p.MsgReadWriter) error {
 					return fmt.Errorf("garbage received (directMessage)")
 				}
 				for _, envelope := range envelopes {
-					wh.postEvent(envelope, p2pCode)
+					wh.postEvent(envelope, true)
 				}
 			}
-		case mailRequestCode:
+		case p2pRequestCode:
 			// Must be processed if mail server is implemented. Otherwise ignore.
 			if wh.mailServer != nil {
 				s := rlp.NewStream(packet.Payload, uint64(packet.Size))
@@ -382,7 +395,7 @@ func (wh *Whisper) add(envelope *Envelope) error {
 
 	if sent > now {
 		if sent-SynchAllowance > now {
-			return fmt.Errorf("message created in the future")
+			return fmt.Errorf("envelope created in the future [%x]", envelope.Hash())
 		} else {
 			// recalculate PoW, adjusted for the time difference, plus one second for latency
 			envelope.calculatePoW(sent - now + 1)
@@ -393,30 +406,31 @@ func (wh *Whisper) add(envelope *Envelope) error {
 		if envelope.Expiry+SynchAllowance*2 < now {
 			return fmt.Errorf("very old message")
 		} else {
+			glog.V(logger.Debug).Infof("expired envelope dropped [%x]", envelope.Hash())
 			return nil // drop envelope without error
 		}
 	}
 
 	if len(envelope.Data) > MaxMessageLength {
-		return fmt.Errorf("huge messages are not allowed")
+		return fmt.Errorf("huge messages are not allowed [%x]", envelope.Hash())
 	}
 
 	if len(envelope.Version) > 4 {
-		return fmt.Errorf("oversized Version")
+		return fmt.Errorf("oversized version [%x]", envelope.Hash())
 	}
 
 	if len(envelope.AESNonce) > AESNonceMaxLength {
 		// the standard AES GSM nonce size is 12,
 		// but const gcmStandardNonceSize cannot be accessed directly
-		return fmt.Errorf("oversized AESNonce")
+		return fmt.Errorf("oversized AESNonce [%x]", envelope.Hash())
 	}
 
 	if len(envelope.Salt) > saltLength {
-		return fmt.Errorf("oversized Salt")
+		return fmt.Errorf("oversized salt [%x]", envelope.Hash())
 	}
 
 	if envelope.PoW() < MinimumPoW && !wh.test {
-		glog.V(logger.Debug).Infof("envelope with low PoW dropped: %f", envelope.PoW())
+		glog.V(logger.Debug).Infof("envelope with low PoW dropped: %f [%x]", envelope.PoW(), envelope.Hash())
 		return nil // drop envelope without error
 	}
 
@@ -436,22 +450,59 @@ func (wh *Whisper) add(envelope *Envelope) error {
 	wh.poolMu.Unlock()
 
 	if alreadyCached {
-		glog.V(logger.Detail).Infof("whisper envelope already cached: %x\n", envelope)
+		glog.V(logger.Detail).Infof("whisper envelope already cached [%x]\n", envelope.Hash())
 	} else {
-		wh.postEvent(envelope, messagesCode) // notify the local node about the new message
+		glog.V(logger.Detail).Infof("cached whisper envelope [%x]: %v\n", envelope.Hash(), envelope)
-		glog.V(logger.Detail).Infof("cached whisper envelope %v\n", envelope)
+		wh.postEvent(envelope, false) // notify the local node about the new message
 	}
 	return nil
 }
 
-// postEvent delivers the message to the watchers.
+// postEvent queues the message for further processing.
-func (w *Whisper) postEvent(envelope *Envelope, messageCode uint64) {
+func (w *Whisper) postEvent(envelope *Envelope, isP2P bool) {
 	// if the version of incoming message is higher than
 	// currently supported version, we can not decrypt it,
 	// and therefore just ignore this message
 	if envelope.Ver() <= EnvelopeVersion {
-		// todo: review if you need an additional thread here
+		if isP2P {
-		go w.filters.NotifyWatchers(envelope, messageCode)
+			w.p2pMsgQueue <- envelope
+		} else {
+			w.checkOverflow()
+			w.messageQueue <- envelope
+		}
+	}
+}
+
+// checkOverflow checks if message queue overflow occurs and reports it if necessary.
+func (w *Whisper) checkOverflow() {
+	queueSize := len(w.messageQueue)
+
+	if queueSize == messageQueueLimit {
+		if !w.overflow {
+			w.overflow = true
+			glog.V(logger.Warn).Infoln("message queue overflow")
+		}
+	} else if queueSize <= messageQueueLimit/2 {
+		if w.overflow {
+			w.overflow = false
+		}
+	}
+}
+
+// processQueue delivers the messages to the watchers during the lifetime of the whisper node.
+func (w *Whisper) processQueue() {
+	var e *Envelope
+	for {
+		select {
+		case <-w.quit:
+			return
+
+		case e = <-w.messageQueue:
+			w.filters.NotifyWatchers(e, false)
+
+		case e = <-w.p2pMsgQueue:
+			w.filters.NotifyWatchers(e, true)
+		}
 	}
 }
 

whisper/whisperv5/whisper_test.go

@@ -19,6 +19,7 @@ package whisperv5
 import (
 	"bytes"
 	"testing"
+	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
@@ -309,3 +310,56 @@ func TestWhisperSymKeyManagement(t *testing.T) {
 		t.Fatalf("failed to delete second key: second key is not nil.")
 	}
 }
+
+func TestExpiry(t *testing.T) {
+	InitSingleTest()
+
+	w := NewWhisper(nil)
+	w.test = true
+	w.Start(nil)
+	defer w.Stop()
+
+	params, err := generateMessageParams()
+	if err != nil {
+		t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
+	}
+
+	params.TTL = 1
+	msg := NewSentMessage(params)
+	env, err := msg.Wrap(params)
+	if err != nil {
+		t.Fatalf("failed Wrap with seed %d: %s.", seed, err)
+	}
+
+	err = w.Send(env)
+	if err != nil {
+		t.Fatalf("failed to send envelope with seed %d: %s.", seed, err)
+	}
+
+	// wait till received or timeout
+	var received, expired bool
+	for j := 0; j < 20; j++ {
+		time.Sleep(100 * time.Millisecond)
+		if len(w.Envelopes()) > 0 {
+			received = true
+			break
+		}
+	}
+
+	if !received {
+		t.Fatalf("did not receive the sent envelope, seed: %d.", seed)
+	}
+
+	// wait till expired or timeout
+	for j := 0; j < 20; j++ {
+		time.Sleep(100 * time.Millisecond)
+		if len(w.Envelopes()) == 0 {
+			expired = true
+			break
+		}
+	}
+
+	if !expired {
+		t.Fatalf("expire failed, seed: %d.", seed)
+	}
+}