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p2p/adapters: Add "exec" node adapter

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Signed-off-by: Lewis Marshall <lewis@lmars.net>
This commit is contained in:
Lewis Marshall 2017-04-23 13:54:06 +01:00
parent 4c6648ef49
commit 4807103338
14 changed files with 768 additions and 60 deletions
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246
p2p/adapters/exec.go Normal file
View file

@ -0,0 +1,246 @@
package adapters
import (
"encoding/json"
"errors"
"fmt"
"os"
"os/exec"
"os/signal"
"path/filepath"
"syscall"
"time"
"github.com/docker/docker/pkg/reexec"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/rpc"
)
// serviceFunc returns a node.ServiceConstructor which can be used to boot
// devp2p nodes
type serviceFunc func(id *NodeId) node.ServiceConstructor
// serviceFuncs is a map of registered services which are used to boot devp2p
// nodes
var serviceFuncs = make(map[string]serviceFunc)
// RegisterService registers the given serviceFunc which can then be used to
// start a devp2p node with the given name
func RegisterService(name string, f serviceFunc) {
if _, exists := serviceFuncs[name]; exists {
panic(fmt.Sprintf("node service already exists: %q", name))
}
serviceFuncs[name] = f
}
// ExecNode is a NodeAdapter which starts the node by exec'ing the current
// binary and running a registered serviceFunc
type ExecNode struct {
ID *NodeId
Service string
Dir string
Config *node.Config
Cmd *exec.Cmd
Client *rpc.Client
Info *p2p.NodeInfo
}
// NewExecNode creates a new ExecNode which will run the given service using a
// sub-directory of the given baseDir
func NewExecNode(id *NodeId, service, baseDir string) (*ExecNode, error) {
if _, exists := serviceFuncs[service]; !exists {
return nil, fmt.Errorf("unknown node service %q", service)
}
// create the node directory using the first 12 characters of the ID
dir := filepath.Join(baseDir, id.String()[0:12])
if err := os.Mkdir(dir, 0755); err != nil {
return nil, fmt.Errorf("error creating node directory: %s", err)
}
// generate the config
conf := node.DefaultConfig
conf.DataDir = filepath.Join(dir, "data")
conf.IPCPath = filepath.Join(dir, "ipc.sock")
conf.P2P.ListenAddr = "127.0.0.1:0"
conf.P2P.NoDiscovery = true
conf.P2P.NAT = nil
return &ExecNode{
ID: id,
Service: service,
Dir: dir,
Config: &conf,
}, nil
}
// Addr returns the node's enode URL
func (n *ExecNode) Addr() []byte {
if n.Info == nil {
return nil
}
return []byte(n.Info.Enode)
}
// Start exec's the node passing the ID and service as command line arguments
// and the node config encoded as JSON in the _P2P_NODE_CONFIG environment
// variable
func (n *ExecNode) Start() (err error) {
if n.Cmd != nil {
return errors.New("already started")
}
defer func() {
if err != nil {
log.Error("node failed to start", "err", err)
n.Stop()
}
}()
// encode the config
conf, err := json.Marshal(n.Config)
if err != nil {
return fmt.Errorf("error generating node config: %s", err)
}
// start the node
cmd := &exec.Cmd{
Path: reexec.Self(),
Args: []string{"p2p-node", n.Service, n.ID.String()},
Stdout: os.Stdout,
Stderr: os.Stderr,
Env: append(os.Environ(), fmt.Sprintf("_P2P_NODE_CONFIG=%s", conf)),
}
if err := cmd.Start(); err != nil {
return fmt.Errorf("error starting node: %s", err)
}
n.Cmd = cmd
// create the RPC client
for start := time.Now(); time.Since(start) < 10*time.Second; time.Sleep(50 * time.Millisecond) {
n.Client, err = rpc.Dial(n.Config.IPCPath)
if err == nil {
break
}
}
if n.Client == nil {
return fmt.Errorf("error creating IPC client: %s", err)
}
// load info
var info p2p.NodeInfo
if err := n.Client.Call(&info, "admin_nodeInfo"); err != nil {
return fmt.Errorf("error getting node info: %s", err)
}
n.Info = &info
return nil
}
// Stop stops the node by first sending SIGTERM and then SIGKILL if the node
// doesn't stop within 5s
func (n *ExecNode) Stop() error {
if n.Cmd == nil {
return nil
}
defer func() {
n.Cmd = nil
}()
if n.Client != nil {
n.Client.Close()
n.Client = nil
n.Info = nil
}
if err := n.Cmd.Process.Signal(syscall.SIGTERM); err != nil {
return n.Cmd.Process.Kill()
}
waitErr := make(chan error)
go func() {
waitErr <- n.Cmd.Wait()
}()
select {
case err := <-waitErr:
return err
case <-time.After(5 * time.Second):
return n.Cmd.Process.Kill()
}
}
// Connect connects the node to the given addr by calling the Admin.AddPeer
// IPC method
func (n *ExecNode) Connect(addr []byte) error {
if n.Client == nil {
return errors.New("node not started")
}
return n.Client.Call(nil, "admin_addPeer", string(addr))
}
// Disconnect disconnects the node from the given addr by calling the
// Admin.RemovePeer IPC method
func (n *ExecNode) Disconnect(addr []byte) error {
if n.Client == nil {
return errors.New("node not started")
}
return n.Client.Call(nil, "admin_removePeer", string(addr))
}
func init() {
// register a reexec function to start a devp2p node when the current
// binary is executed as "p2p-node"
reexec.Register("p2p-node", execP2PNode)
}
// execP2PNode starts a devp2p node when the current binary is executed with
// argv[0] being "p2p-node", reading the service / ID from argv[1] / argv[2]
// and the node config from the _P2P_NODE_CONFIG environment variable
func execP2PNode() {
glogger := log.NewGlogHandler(log.StreamHandler(os.Stderr, log.LogfmtFormat()))
glogger.Verbosity(log.LvlInfo)
log.Root().SetHandler(glogger)
// read the service and ID from argv
serviceName := os.Args[1]
id := NewNodeIdFromHex(os.Args[2])
// decode the config
confEnv := os.Getenv("_P2P_NODE_CONFIG")
if confEnv == "" {
log.Crit("missing _P2P_NODE_CONFIG")
}
var conf node.Config
if err := json.Unmarshal([]byte(confEnv), &conf); err != nil {
log.Crit("error decoding _P2P_NODE_CONFIG", "err", err)
}
// lookup the service constructor
service, exists := serviceFuncs[serviceName]
if !exists {
log.Crit(fmt.Sprintf("unknown node service %q", serviceName))
}
// start the devp2p stack
stack, err := node.New(&conf)
if err != nil {
log.Crit("error creating node", "err", err)
}
if err := stack.Register(service(id)); err != nil {
log.Crit("error registering service", "err", err)
}
if err := stack.Start(); err != nil {
log.Crit("error starting node", "err", err)
}
go func() {
sigc := make(chan os.Signal, 1)
signal.Notify(sigc, syscall.SIGTERM)
defer signal.Stop(sigc)
<-sigc
log.Info("Received SIGTERM, shutting down...")
stack.Stop()
}()
stack.Wait()
}

10
p2p/adapters/inproc.go
View file

@ -66,12 +66,16 @@ func NewSimNode(id *NodeId, n Network) *SimNode {
}
}
func (self *SimNode) LocalAddr() []byte {
func (self *SimNode) Addr() []byte {
return self.Id.Bytes()
}
func (self *SimNode) ParseAddr(p []byte, s string) ([]byte, error) {
return p, nil
func (self *SimNode) Start() error {
return nil
}
func (self *SimNode) Stop() error {
return nil
}
func (self *SimNode) GetPeer(id *NodeId) *Peer {

15
p2p/adapters/types.go
View file

@ -51,7 +51,7 @@ func (self *NodeId) MarshalJSON() (out []byte, err error) {
func (self *NodeId) UnmarshalJSON(value []byte) error {
s := string(value)
h, err := discover.HexID(s)
h, err := discover.HexID(s[1 : len(s)-1])
if err != nil {
return err
}
@ -64,20 +64,17 @@ func (self *NodeId) Label() string {
}
type NodeAdapter interface {
Connect([]byte) error
Disconnect([]byte) error
// Disconnect(*p2p.Peer, p2p.MsgReadWriter)
Addr() []byte
Start() error
Stop() error
Connect(addr []byte) error
Disconnect(addr []byte) error
}
type ProtocolRunner interface {
RunProtocol(id *NodeId, rw, rrw p2p.MsgReadWriter, p *Peer) error
}
type StartAdapter interface {
Start() error
Stop() error
}
type Reporter interface {
DidConnect(*NodeId, *NodeId) error
DidDisconnect(*NodeId, *NodeId) error

41
p2p/simulations/network.go
View file

@ -424,11 +424,6 @@ func (self *Network) NewNode(conf *NodeConfig) error {
func (self *Network) Config() *NetworkConfig {
return self.conf
}
func (self *Network) NewSimNode(conf *NodeConfig) adapters.NodeAdapter {
id := conf.Id
na := adapters.NewSimNode(id, self)
return na
}
// newConn adds a new connection to the network
// it errors if the respective nodes do not exist
@ -469,12 +464,8 @@ func (self *Network) Start(id *adapters.NodeId) error {
return fmt.Errorf("node %v already up", id)
}
log.Trace(fmt.Sprintf("starting node %v: %v adapter %v", id, node.Up, node.Adapter()))
sa, ok := node.Adapter().(adapters.StartAdapter)
if ok {
err := sa.Start()
if err != nil {
return err
}
if err := node.Adapter().Start(); err != nil {
return err
}
node.Up = true
log.Info(fmt.Sprintf("started node %v: %v", id, node.Up))
@ -496,12 +487,8 @@ func (self *Network) Stop(id *adapters.NodeId) error {
if !node.Up {
return fmt.Errorf("node %v already down", id)
}
sa, ok := node.Adapter().(adapters.StartAdapter)
if ok {
err := sa.Stop()
if err != nil {
return err
}
if err := node.Adapter().Stop(); err != nil {
return err
}
node.Up = false
log.Info(fmt.Sprintf("stop node %v: %v", id, node.Up))
@ -539,9 +526,9 @@ func (self *Network) Connect(oneId, otherId *adapters.NodeId) error {
// to this method with connect = false to avoid infinite recursion
// this is not relevant for nodes starting up (which can only be externally triggered)
if rev {
err = conn.other.na.Connect(oneId.Bytes())
err = conn.other.na.Connect(conn.one.na.Addr())
} else {
err = conn.one.na.Connect(otherId.Bytes())
err = conn.one.na.Connect(conn.other.na.Addr())
}
if err != nil {
return err
@ -679,3 +666,19 @@ func (self *Network) getConn(oneId, otherId *adapters.NodeId) *Conn {
}
return self.Conns[i]
}
func (self *Network) Shutdown() {
// disconnect all nodes
for _, conn := range self.Conns {
if err := self.Disconnect(conn.One, conn.Other); err != nil {
log.Warn(fmt.Sprintf("error disconnecting %s from %s", conn.One.Label(), conn.Other.Label()), "err", err)
}
}
// stop all nodes
for _, node := range self.Nodes {
if err := node.na.Stop(); err != nil {
log.Warn(fmt.Sprintf("error stopping node %s", node.Id.Label()), "err", err)
}
}
}

162
swarm/network/simulations/discovery/discovery_test.go
View file

@ -3,16 +3,85 @@ package discovery_test
import (
"context"
"fmt"
"io/ioutil"
"os"
"testing"
"time"
"github.com/docker/docker/pkg/reexec"
"github.com/ethereum/go-ethereum/log"
p2pnode "github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/adapters"
"github.com/ethereum/go-ethereum/p2p/discover"
"github.com/ethereum/go-ethereum/p2p/simulations"
"github.com/ethereum/go-ethereum/rpc"
"github.com/ethereum/go-ethereum/swarm/network"
)
func TestDiscoverySimulation(t *testing.T) {
// serviceName is used with the exec adapter so the exec'd binary knows which
// service to execute
const serviceName = "discovery"
func init() {
// register the discovery service which will run as a devp2p
// protocol when using the exec adapter
adapters.RegisterService(serviceName, discoveryService)
// log.Root().SetHandler(log.LvlFilterHandler(log.LvlError, log.StreamHandler(os.Stderr, log.TerminalFormat(false))))
log.Root().SetHandler(log.LvlFilterHandler(log.LvlTrace, log.StreamHandler(os.Stderr, log.TerminalFormat(false))))
}
func TestMain(m *testing.M) {
// reexec a service if we have been exec'd by the exec adapter
if reexec.Init() {
return
}
os.Exit(m.Run())
}
func TestDiscoverySimulationExecAdapter(t *testing.T) {
baseDir, err := ioutil.TempDir("", "swarm-test")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(baseDir)
setup := func(net *simulations.Network, trigger chan *adapters.NodeId) {
var ids []*adapters.NodeId
// TODO: get events from the devp2p node
time.AfterFunc(5*time.Second, func() {
for _, id := range ids {
trigger <- id
}
})
net.SetNaf(func(conf *simulations.NodeConfig) adapters.NodeAdapter {
node, err := adapters.NewExecNode(conf.Id, serviceName, baseDir)
if err != nil {
panic(err)
}
ids = append(ids, conf.Id)
return node
})
}
testDiscoverySimulation(t, setup)
}
func TestDiscoverySimulationSimAdapter(t *testing.T) {
setup := func(net *simulations.Network, trigger chan *adapters.NodeId) {
net.SetNaf(func(conf *simulations.NodeConfig) adapters.NodeAdapter {
return newSimNode(conf.Id, net, trigger)
})
}
testDiscoverySimulation(t, setup)
}
func testDiscoverySimulation(t *testing.T, setup func(net *simulations.Network, trigger chan *adapters.NodeId)) {
// create 10 node network
nodeCount := 10
trigger := make(chan *adapters.NodeId)
@ -20,12 +89,8 @@ func TestDiscoverySimulation(t *testing.T) {
Id: "0",
Backend: true,
})
nodes := make(map[*adapters.NodeId]*node, nodeCount)
net.SetNaf(func(conf *simulations.NodeConfig) adapters.NodeAdapter {
node := newNode(conf.Id, net, trigger)
nodes[conf.Id] = node
return node
})
defer net.Shutdown()
setup(net, trigger)
ids := adapters.RandomNodeIds(nodeCount)
for _, id := range ids {
net.NewNode(&simulations.NodeConfig{Id: id})
@ -57,8 +122,8 @@ func TestDiscoverySimulation(t *testing.T) {
default:
}
node, ok := nodes[id]
if !ok {
node := net.GetNode(id)
if node == nil {
return false, fmt.Errorf("unknown node: %s", id)
}
@ -97,25 +162,37 @@ func TestDiscoverySimulation(t *testing.T) {
type node struct {
*network.Hive
adapters.NodeAdapter
*adapters.SimNode
id *adapters.NodeId
network *simulations.Network
trigger chan *adapters.NodeId
id *adapters.NodeId
trigger chan *adapters.NodeId
protocol *p2p.Protocol
connectPeer func(string) error
}
func newNode(id *adapters.NodeId, net *simulations.Network, trigger chan *adapters.NodeId) *node {
func newSimNode(id *adapters.NodeId, net *simulations.Network, trigger chan *adapters.NodeId) *node {
node := newNode(id)
node.SimNode = adapters.NewSimNode(id, net)
node.Run = node.protocol.Run
node.trigger = trigger
node.connectPeer = func(s string) error {
return node.Connect(adapters.NewNodeIdFromHex(s).Bytes())
}
return node
}
func newNode(id *adapters.NodeId) *node {
addr := network.NewPeerAddrFromNodeId(id)
kademlia := newKademlia(addr.OverlayAddr())
hive := newHive(kademlia)
codeMap := network.BzzCodeMap(network.DiscoveryMsgs...)
nodeAdapter := adapters.NewSimNode(id, net)
node := &node{
Hive: hive,
NodeAdapter: nodeAdapter,
id: id,
network: net,
trigger: trigger,
Hive: hive,
id: id,
}
services := func(peer network.Peer) error {
discoveryPeer := network.NewDiscovery(peer, kademlia)
@ -125,7 +202,7 @@ func newNode(id *adapters.NodeId, net *simulations.Network, trigger chan *adapte
})
return nil
}
nodeAdapter.Run = network.Bzz(addr.OverlayAddr(), addr.UnderlayAddr(), codeMap, services, nil, nil).Run
node.protocol = network.Bzz(addr.OverlayAddr(), addr.UnderlayAddr(), codeMap, services, nil, nil)
return node
}
@ -168,14 +245,6 @@ func (n *node) Remove(peer network.Peer) {
n.triggerCheck()
}
func (n *node) RunProtocol(id *adapters.NodeId, rw, rrw p2p.MsgReadWriter, peer *adapters.Peer) error {
return n.NodeAdapter.(adapters.ProtocolRunner).RunProtocol(id, rw, rrw, peer)
}
func (n *node) connectPeer(s string) error {
return n.network.Connect(n.id, adapters.NewNodeIdFromHex(s))
}
func (n *node) hiveKeepAlive() <-chan time.Time {
return time.Tick(time.Second)
}
@ -184,3 +253,38 @@ func (n *node) triggerCheck() {
// TODO: rate limit the trigger?
go func() { n.trigger <- n.id }()
}
func discoveryService(id *adapters.NodeId) p2pnode.ServiceConstructor {
return func(ctx *p2pnode.ServiceContext) (p2pnode.Service, error) {
node := newNode(id)
return &p2pService{node}, nil
}
}
type p2pService struct {
node *node
}
func (s *p2pService) Protocols() []p2p.Protocol {
return []p2p.Protocol{*s.node.protocol}
}
func (s *p2pService) APIs() []rpc.API {
return nil
}
func (s *p2pService) Start(server *p2p.Server) error {
s.node.connectPeer = func(url string) error {
node, err := discover.ParseNode(url)
if err != nil {
return fmt.Errorf("invalid node URL: %v", err)
}
server.AddPeer(node)
return nil
}
return s.node.Start()
}
func (s *p2pService) Stop() error {
return s.node.Stop()
}

191
vendor/github.com/docker/docker/LICENSE generated vendored Normal file
View file

@ -0,0 +1,191 @@
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9. Accepting Warranty or Additional Liability. While redistributing
the Work or Derivative Works thereof, You may choose to offer,
and charge a fee for, acceptance of support, warranty, indemnity,
or other liability obligations and/or rights consistent with this
License. However, in accepting such obligations, You may act only
on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
defend, and hold each Contributor harmless for any liability
incurred by, or claims asserted against, such Contributor by reason
of your accepting any such warranty or additional liability.
END OF TERMS AND CONDITIONS
Copyright 2013-2017 Docker, Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
https://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

19
vendor/github.com/docker/docker/NOTICE generated vendored Normal file
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Docker
Copyright 2012-2017 Docker, Inc.
This product includes software developed at Docker, Inc. (https://www.docker.com).
This product contains software (https://github.com/kr/pty) developed
by Keith Rarick, licensed under the MIT License.
The following is courtesy of our legal counsel:
Use and transfer of Docker may be subject to certain restrictions by the
United States and other governments.
It is your responsibility to ensure that your use and/or transfer does not
violate applicable laws.
For more information, please see https://www.bis.doc.gov
See also https://www.apache.org/dev/crypto.html and/or seek legal counsel.

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# reexec
The `reexec` package facilitates the busybox style reexec of the docker binary that we require because
of the forking limitations of using Go. Handlers can be registered with a name and the argv 0 of
the exec of the binary will be used to find and execute custom init paths.

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// +build linux
package reexec
import (
"os/exec"
"syscall"
)
// Self returns the path to the current process's binary.
// Returns "/proc/self/exe".
func Self() string {
return "/proc/self/exe"
}
// Command returns *exec.Cmd which has Path as current binary. Also it setting
// SysProcAttr.Pdeathsig to SIGTERM.
// This will use the in-memory version (/proc/self/exe) of the current binary,
// it is thus safe to delete or replace the on-disk binary (os.Args[0]).
func Command(args ...string) *exec.Cmd {
return &exec.Cmd{
Path: Self(),
Args: args,
SysProcAttr: &syscall.SysProcAttr{
Pdeathsig: syscall.SIGTERM,
},
}
}

23
vendor/github.com/docker/docker/pkg/reexec/command_unix.go generated vendored Normal file
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@ -0,0 +1,23 @@
// +build freebsd solaris darwin
package reexec
import (
"os/exec"
)
// Self returns the path to the current process's binary.
// Uses os.Args[0].
func Self() string {
return naiveSelf()
}
// Command returns *exec.Cmd which has Path as current binary.
// For example if current binary is "docker" at "/usr/bin/", then cmd.Path will
// be set to "/usr/bin/docker".
func Command(args ...string) *exec.Cmd {
return &exec.Cmd{
Path: Self(),
Args: args,
}
}

12
vendor/github.com/docker/docker/pkg/reexec/command_unsupported.go generated vendored Normal file
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@ -0,0 +1,12 @@
// +build !linux,!windows,!freebsd,!solaris,!darwin
package reexec
import (
"os/exec"
)
// Command is unsupported on operating systems apart from Linux, Windows, Solaris and Darwin.
func Command(args ...string) *exec.Cmd {
return nil
}

23
vendor/github.com/docker/docker/pkg/reexec/command_windows.go generated vendored Normal file
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// +build windows
package reexec
import (
"os/exec"
)
// Self returns the path to the current process's binary.
// Uses os.Args[0].
func Self() string {
return naiveSelf()
}
// Command returns *exec.Cmd which has Path as current binary.
// For example if current binary is "docker.exe" at "C:\", then cmd.Path will
// be set to "C:\docker.exe".
func Command(args ...string) *exec.Cmd {
return &exec.Cmd{
Path: Self(),
Args: args,
}
}

47
vendor/github.com/docker/docker/pkg/reexec/reexec.go generated vendored Normal file
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package reexec
import (
"fmt"
"os"
"os/exec"
"path/filepath"
)
var registeredInitializers = make(map[string]func())
// Register adds an initialization func under the specified name
func Register(name string, initializer func()) {
if _, exists := registeredInitializers[name]; exists {
panic(fmt.Sprintf("reexec func already registered under name %q", name))
}
registeredInitializers[name] = initializer
}
// Init is called as the first part of the exec process and returns true if an
// initialization function was called.
func Init() bool {
initializer, exists := registeredInitializers[os.Args[0]]
if exists {
initializer()
return true
}
return false
}
func naiveSelf() string {
name := os.Args[0]
if filepath.Base(name) == name {
if lp, err := exec.LookPath(name); err == nil {
return lp
}
}
// handle conversion of relative paths to absolute
if absName, err := filepath.Abs(name); err == nil {
return absName
}
// if we couldn't get absolute name, return original
// (NOTE: Go only errors on Abs() if os.Getwd fails)
return name
}

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vendor/vendor.json vendored
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@ -74,6 +74,12 @@
"revision": "2268707a8f0843315e2004ee4f1d021dc08baedf",
"revisionTime": "2017-02-01T22:58:49Z"
},
{
"checksumSHA1": "lutCa+IVM60R1OYBm9RtDAW50Ys=",
"path": "github.com/docker/docker/pkg/reexec",
"revision": "83ee902ecc3790c33c1e2d87334074436056bb49",
"revisionTime": "2017-04-22T21:51:12Z"
},
{
"checksumSHA1": "zYnPsNAVm1/ViwCkN++dX2JQhBo=",
"path": "github.com/edsrzf/mmap-go",