using monotonic clock

Godeps/_workspace/src/github.com/aristanetworks/goarista/AUTHORS

@@ -0,0 +1,25 @@
+All contributors are required to sign a "Contributor License Agreement" at
+  <TBD>
+
+The following organizations and people have contributed code to this library.
+(Please keep both lists sorted alphabetically.)
+
+
+Arista Networks, Inc.
+
+
+Benoit Sigoure
+Fabrice Rabaute
+
+
+
+The list of individual contributors for code currently in HEAD can be obtained
+at any time with the following script:
+
+find . -type f \
+| while read i; do \
+  git blame -t $i 2>/dev/null; \
+  done \
+| sed 's/^[0-9a-f]\{8\} [^(]*(\([^)]*\) [-+0-9 ]\{14,\}).*/\1/;s/ *$//' \
+| awk '{a[$0]++; t++} END{for(n in a) print n}' \
+| sort

Godeps/_workspace/src/github.com/aristanetworks/goarista/COPYING

@@ -0,0 +1,177 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
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+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
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+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
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+      whether in tort (including negligence), contract, or otherwise,
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+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS

Godeps/_workspace/src/github.com/aristanetworks/goarista/README.md

@@ -0,0 +1,66 @@
+# Arista Go library [![Build Status](https://travis-ci.org/aristanetworks/goarista.svg?branch=master)](https://travis-ci.org/aristanetworks/goarista) [![codecov.io](http://codecov.io/github/aristanetworks/goarista/coverage.svg?branch=master)](http://codecov.io/github/aristanetworks/goarista?branch=master) [![GoDoc](https://godoc.org/github.com/aristanetworks/goarista?status.png)](https://godoc.org/github.com/aristanetworks/goarista) [![Go Report Card](https://goreportcard.com/badge/github.com/aristanetworks/goarista)](https://goreportcard.com/report/github.com/aristanetworks/goarista)
+
+## areflect
+
+Helper functions to work with the `reflect` package.  Contains
+`ForceExport()`, which bypasses the check in `reflect.Value` that
+prevents accessing unexported attributes.
+
+## atime
+
+Provides access to a fast monotonic clock source, to fill in the gap in the
+[Go standard library, which lacks one](https://github.com/golang/go/issues/12914).
+Don't use `time.Now()` in code that needs to time things or otherwise assume
+that time passes at a constant rate, instead use `atime.Nanotime()`.
+
+## cmd
+
+### occli
+
+Simple CLI client for the OpenConfig gRPC interface that prints the response
+protobufs in text form or JSON.
+
+### ockafka
+
+Client for the OpenConfig gRPC interface that publishes updates to Kafka.
+
+### ocredis
+
+Client for the OpenConfig gRPC interface that publishes updates to Redis
+using both [Redis' hashes](http://redis.io/topics/data-types-intro#hashes)
+(one per container / entity / collection) and [Redis' Pub/Sub](http://redis.io/topics/pubsub) 
+mechanism, so that one can [subscribe](http://redis.io/commands/subscribe) to
+incoming updates being applied on the hash maps.
+
+## dscp
+
+Provides `ListenTCPWithTOS()`, which is a replacement for `net.ListenTCP()`
+that allows specifying the ToS (Type of Service), to specify DSCP / ECN /
+class of service flags to use for incoming connections.
+
+## key
+
+Provides a common type used across various Arista projects, named `key.Key`,
+which is used to work around the fact that Go can't let one
+use a non-hashable type as a key to a `map`, and we sometimes need to use
+a `map[string]interface{}` (or something containing one) as a key to maps.
+As a result, we frequently use `map[key.Key]interface{}` instead of just
+`map[interface{}]interface{}` when we need a generic key-value collection.
+
+## monitor
+
+A library to help expose monitoring metrics on top of the
+[`expvar`](https://golang.org/pkg/expvar/) infrastructure.
+
+## netns
+
+`netns.Do(namespace, cb)` provides a handy mechanism to execute the given
+callback `cb` in the given [network namespace](https://lwn.net/Articles/580893/).
+
+## test
+
+This is a [Go](http://golang.org/) library to help in writing unit tests.
+
+## Examples
+
+TBD

Godeps/_workspace/src/github.com/aristanetworks/goarista/atime/issue15006.s

@@ -0,0 +1,6 @@
+// Copyright (C) 2016  Arista Networks, Inc.
+// Use of this source code is governed by the Apache License 2.0
+// that can be found in the COPYING file.
+
+// This file is intentionally empty.
+// It's a workaround for https://github.com/golang/go/issues/15006

Godeps/_workspace/src/github.com/aristanetworks/goarista/atime/nanotime.go

@@ -0,0 +1,26 @@
+// Copyright (C) 2016  Arista Networks, Inc.
+// Use of this source code is governed by the Apache License 2.0
+// that can be found in the COPYING file.
+
+// Package atime provides a fast monotonic clock source.
+package atime
+
+import "unsafe"
+
+// Make goimports import the unsafe package, which is required to be able
+// to use //go:linkname
+var _ = unsafe.Sizeof(0)
+
+//go:noescape
+//go:linkname nanotime runtime.nanotime
+func nanotime() int64
+
+// NanoTime returns the current time in nanoseconds from a monotonic clock.
+// The time returned is based on some arbitrary platform-specific point in the
+// past.  The time returned is guaranteed to increase monotonically at a
+// constant rate, unlike time.Now() from the Go standard library, which may
+// slow down, speed up, jump forward or backward, due to NTP activity or leap
+// seconds.
+func NanoTime() uint64 {
+	return uint64(nanotime())
+}

Godeps/_workspace/src/github.com/aristanetworks/goarista/atime/nanotime_test.go

@@ -0,0 +1,22 @@
+// Copyright (C) 2016  Arista Networks, Inc.
+// Use of this source code is governed by the Apache License 2.0
+// that can be found in the COPYING file.
+
+// Package atime provides a fast monotonic clock source.
+package atime_test
+
+import (
+	"testing"
+
+	. "github.com/aristanetworks/goarista/atime"
+)
+
+func TestNanoTime(t *testing.T) {
+	for i := 0; i < 100; i++ {
+		t1 := NanoTime()
+		t2 := NanoTime()
+		if t1 >= t2 {
+			t.Fatalf("t1=%d should have been strictly less than t2=%d", t1, t2)
+		}
+	}
+}

common/mclock/mclock.go

@@ -0,0 +1,30 @@
+// 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 mclock is a wrapper for a monotonic clock source
+package mclock
+
+import (
+	"time"
+
+	"github.com/aristanetworks/goarista/atime"
+)
+
+type AbsTime time.Duration  // absolute monotonic time
+
+func Now() AbsTime {
+	return AbsTime(atime.NanoTime())
+}

les/flowcontrol/control.go

@@ -20,6 +20,8 @@ package flowcontrol
 import (
 	"sync"
 	"time"
+
+	"github.com/ethereum/go-ethereum/common/mclock"
 )
 
 const fcTimeConst = 1000000
@@ -110,7 +112,7 @@ func NewServerNode(params *ServerParams) *ServerNode {
 }
 
 func getTime() int64 {
-	return time.Now().UnixNano()
+	return int64(mclock.Now())
 }
 
 func (peer *ServerNode) recalcBLE(time int64) {

les/odr.go

@@ -19,6 +19,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/ethereum/go-ethereum/common/mclock"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/light"
 	"github.com/ethereum/go-ethereum/logger"
@@ -129,7 +130,7 @@ func (self *LesOdr) Deliver(peer *peer, msg *Msg) error {
 }
 
 func (self *LesOdr) requestPeer(req *sentReq, peer *peer, delivered, timeout chan struct{}, reqWg *sync.WaitGroup) {
-	stime := time.Now()
+	stime := mclock.Now()
 	defer func() {
 		req.lock.Lock()
 		delete(req.sentTo, peer)
@@ -139,7 +140,7 @@ func (self *LesOdr) requestPeer(req *sentReq, peer *peer, delivered, timeout cha
 
 	select {
 	case <-delivered:
-		servTime := uint64(time.Now().Sub(stime))
+		servTime := uint64(mclock.Now()-stime)
 		self.peers.updateTimeout(peer, false)
 		self.peers.updateServTime(peer, servTime)
 		return
@@ -154,7 +155,7 @@ func (self *LesOdr) requestPeer(req *sentReq, peer *peer, delivered, timeout cha
 
 	select {
 	case <-delivered:
-		servTime := uint64(time.Now().Sub(stime))
+		servTime := uint64(mclock.Now()-stime)
 		self.peers.updateServTime(peer, servTime)
 		return
 	case <-time.After(hardRequestTimeout):