plugeth/p2p/simulations/adapters/exec.go
Ferenc Szabo fe03b76ffe A few minor code inspection fixes (#18393)
* swarm/network: fix code inspection problems

- typos
- redundant import alias

* p2p/simulations: fix code inspection problems

- typos
- unused function parameters
- redundant import alias
- code style issue: snake case

* swarm/network: fix unused method parameters inspections
2019-01-06 11:58:57 +01:00

531 lines
14 KiB
Go

// Copyright 2017 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 adapters
import (
"bytes"
"context"
"crypto/ecdsa"
"encoding/json"
"errors"
"fmt"
"io"
"net"
"net/http"
"os"
"os/exec"
"os/signal"
"path/filepath"
"strings"
"sync"
"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/p2p/enode"
"github.com/ethereum/go-ethereum/rpc"
"golang.org/x/net/websocket"
)
func init() {
// Register a reexec function to start a simulation node when the current binary is
// executed as "p2p-node" (rather than whatever the main() function would normally do).
reexec.Register("p2p-node", execP2PNode)
}
// ExecAdapter is a NodeAdapter which runs simulation nodes by executing the current binary
// as a child process.
type ExecAdapter struct {
// BaseDir is the directory under which the data directories for each
// simulation node are created.
BaseDir string
nodes map[enode.ID]*ExecNode
}
// NewExecAdapter returns an ExecAdapter which stores node data in
// subdirectories of the given base directory
func NewExecAdapter(baseDir string) *ExecAdapter {
return &ExecAdapter{
BaseDir: baseDir,
nodes: make(map[enode.ID]*ExecNode),
}
}
// Name returns the name of the adapter for logging purposes
func (e *ExecAdapter) Name() string {
return "exec-adapter"
}
// NewNode returns a new ExecNode using the given config
func (e *ExecAdapter) NewNode(config *NodeConfig) (Node, error) {
if len(config.Services) == 0 {
return nil, errors.New("node must have at least one service")
}
for _, service := range config.Services {
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
// as Unix socket paths cannot be longer than 256 characters
dir := filepath.Join(e.BaseDir, config.ID.String()[:12])
if err := os.Mkdir(dir, 0755); err != nil {
return nil, fmt.Errorf("error creating node directory: %s", err)
}
// generate the config
conf := &execNodeConfig{
Stack: node.DefaultConfig,
Node: config,
}
conf.Stack.DataDir = filepath.Join(dir, "data")
conf.Stack.WSHost = "127.0.0.1"
conf.Stack.WSPort = 0
conf.Stack.WSOrigins = []string{"*"}
conf.Stack.WSExposeAll = true
conf.Stack.P2P.EnableMsgEvents = false
conf.Stack.P2P.NoDiscovery = true
conf.Stack.P2P.NAT = nil
conf.Stack.NoUSB = true
// listen on a localhost port, which we set when we
// initialise NodeConfig (usually a random port)
conf.Stack.P2P.ListenAddr = fmt.Sprintf(":%d", config.Port)
node := &ExecNode{
ID: config.ID,
Dir: dir,
Config: conf,
adapter: e,
}
node.newCmd = node.execCommand
e.nodes[node.ID] = node
return node, nil
}
// ExecNode starts a simulation node by exec'ing the current binary and
// running the configured services
type ExecNode struct {
ID enode.ID
Dir string
Config *execNodeConfig
Cmd *exec.Cmd
Info *p2p.NodeInfo
adapter *ExecAdapter
client *rpc.Client
wsAddr string
newCmd func() *exec.Cmd
key *ecdsa.PrivateKey
}
// Addr returns the node's enode URL
func (n *ExecNode) Addr() []byte {
if n.Info == nil {
return nil
}
return []byte(n.Info.Enode)
}
// Client returns an rpc.Client which can be used to communicate with the
// underlying services (it is set once the node has started)
func (n *ExecNode) Client() (*rpc.Client, error) {
return n.client, nil
}
// Start exec's the node passing the ID and service as command line arguments
// and the node config encoded as JSON in an environment variable.
func (n *ExecNode) Start(snapshots map[string][]byte) (err error) {
if n.Cmd != nil {
return errors.New("already started")
}
defer func() {
if err != nil {
n.Stop()
}
}()
// encode a copy of the config containing the snapshot
confCopy := *n.Config
confCopy.Snapshots = snapshots
confCopy.PeerAddrs = make(map[string]string)
for id, node := range n.adapter.nodes {
confCopy.PeerAddrs[id.String()] = node.wsAddr
}
confData, err := json.Marshal(confCopy)
if err != nil {
return fmt.Errorf("error generating node config: %s", err)
}
// start the one-shot server that waits for startup information
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
statusURL, statusC := n.waitForStartupJSON(ctx)
// start the node
cmd := n.newCmd()
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Env = append(os.Environ(),
envStatusURL+"="+statusURL,
envNodeConfig+"="+string(confData),
)
if err := cmd.Start(); err != nil {
return fmt.Errorf("error starting node: %s", err)
}
n.Cmd = cmd
// read the WebSocket address from the stderr logs
status := <-statusC
if status.Err != "" {
return errors.New(status.Err)
}
client, err := rpc.DialWebsocket(ctx, status.WSEndpoint, "http://localhost")
if err != nil {
return fmt.Errorf("can't connect to RPC server: %v", err)
}
// node ready :)
n.client = client
n.wsAddr = status.WSEndpoint
n.Info = status.NodeInfo
return nil
}
// waitForStartupJSON runs a one-shot HTTP server to receive a startup report.
func (n *ExecNode) waitForStartupJSON(ctx context.Context) (string, chan nodeStartupJSON) {
var (
ch = make(chan nodeStartupJSON, 1)
quitOnce sync.Once
srv http.Server
)
l, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
ch <- nodeStartupJSON{Err: err.Error()}
return "", ch
}
quit := func(status nodeStartupJSON) {
quitOnce.Do(func() {
l.Close()
ch <- status
})
}
srv.Handler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
var status nodeStartupJSON
if err := json.NewDecoder(r.Body).Decode(&status); err != nil {
status.Err = fmt.Sprintf("can't decode startup report: %v", err)
}
quit(status)
})
// Run the HTTP server, but don't wait forever and shut it down
// if the context is canceled.
go srv.Serve(l)
go func() {
<-ctx.Done()
quit(nodeStartupJSON{Err: "didn't get startup report"})
}()
url := "http://" + l.Addr().String()
return url, ch
}
// execCommand returns a command which runs the node locally by exec'ing
// the current binary but setting argv[0] to "p2p-node" so that the child
// runs execP2PNode
func (n *ExecNode) execCommand() *exec.Cmd {
return &exec.Cmd{
Path: reexec.Self(),
Args: []string{"p2p-node", strings.Join(n.Config.Node.Services, ","), n.ID.String()},
}
}
// 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.wsAddr = ""
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()
}
}
// NodeInfo returns information about the node
func (n *ExecNode) NodeInfo() *p2p.NodeInfo {
info := &p2p.NodeInfo{
ID: n.ID.String(),
}
if n.client != nil {
n.client.Call(&info, "admin_nodeInfo")
}
return info
}
// ServeRPC serves RPC requests over the given connection by dialling the
// node's WebSocket address and joining the two connections
func (n *ExecNode) ServeRPC(clientConn net.Conn) error {
conn, err := websocket.Dial(n.wsAddr, "", "http://localhost")
if err != nil {
return err
}
var wg sync.WaitGroup
wg.Add(2)
join := func(src, dst net.Conn) {
defer wg.Done()
io.Copy(dst, src)
// close the write end of the destination connection
if cw, ok := dst.(interface {
CloseWrite() error
}); ok {
cw.CloseWrite()
} else {
dst.Close()
}
}
go join(conn, clientConn)
go join(clientConn, conn)
wg.Wait()
return nil
}
// Snapshots creates snapshots of the services by calling the
// simulation_snapshot RPC method
func (n *ExecNode) Snapshots() (map[string][]byte, error) {
if n.client == nil {
return nil, errors.New("RPC not started")
}
var snapshots map[string][]byte
return snapshots, n.client.Call(&snapshots, "simulation_snapshot")
}
// execNodeConfig is used to serialize the node configuration so it can be
// passed to the child process as a JSON encoded environment variable
type execNodeConfig struct {
Stack node.Config `json:"stack"`
Node *NodeConfig `json:"node"`
Snapshots map[string][]byte `json:"snapshots,omitempty"`
PeerAddrs map[string]string `json:"peer_addrs,omitempty"`
}
// execP2PNode starts a simulation 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 an environment variable.
func execP2PNode() {
glogger := log.NewGlogHandler(log.StreamHandler(os.Stderr, log.LogfmtFormat()))
glogger.Verbosity(log.LvlInfo)
log.Root().SetHandler(glogger)
statusURL := os.Getenv(envStatusURL)
if statusURL == "" {
log.Crit("missing " + envStatusURL)
}
// Start the node and gather startup report.
var status nodeStartupJSON
stack, stackErr := startExecNodeStack()
if stackErr != nil {
status.Err = stackErr.Error()
} else {
status.WSEndpoint = "ws://" + stack.WSEndpoint()
status.NodeInfo = stack.Server().NodeInfo()
}
// Send status to the host.
statusJSON, _ := json.Marshal(status)
if _, err := http.Post(statusURL, "application/json", bytes.NewReader(statusJSON)); err != nil {
log.Crit("Can't post startup info", "url", statusURL, "err", err)
}
if stackErr != nil {
os.Exit(1)
}
// Stop the stack if we get a SIGTERM signal.
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() // Wait for the stack to exit.
}
func startExecNodeStack() (*node.Node, error) {
// read the services from argv
serviceNames := strings.Split(os.Args[1], ",")
// decode the config
confEnv := os.Getenv(envNodeConfig)
if confEnv == "" {
return nil, fmt.Errorf("missing " + envNodeConfig)
}
var conf execNodeConfig
if err := json.Unmarshal([]byte(confEnv), &conf); err != nil {
return nil, fmt.Errorf("error decoding %s: %v", envNodeConfig, err)
}
conf.Stack.P2P.PrivateKey = conf.Node.PrivateKey
conf.Stack.Logger = log.New("node.id", conf.Node.ID.String())
// initialize the devp2p stack
stack, err := node.New(&conf.Stack)
if err != nil {
return nil, fmt.Errorf("error creating node stack: %v", err)
}
// register the services, collecting them into a map so we can wrap
// them in a snapshot service
services := make(map[string]node.Service, len(serviceNames))
for _, name := range serviceNames {
serviceFunc, exists := serviceFuncs[name]
if !exists {
return nil, fmt.Errorf("unknown node service %q", err)
}
constructor := func(nodeCtx *node.ServiceContext) (node.Service, error) {
ctx := &ServiceContext{
RPCDialer: &wsRPCDialer{addrs: conf.PeerAddrs},
NodeContext: nodeCtx,
Config: conf.Node,
}
if conf.Snapshots != nil {
ctx.Snapshot = conf.Snapshots[name]
}
service, err := serviceFunc(ctx)
if err != nil {
return nil, err
}
services[name] = service
return service, nil
}
if err := stack.Register(constructor); err != nil {
return stack, fmt.Errorf("error registering service %q: %v", name, err)
}
}
// register the snapshot service
err = stack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
return &snapshotService{services}, nil
})
if err != nil {
return stack, fmt.Errorf("error starting snapshot service: %v", err)
}
// start the stack
if err = stack.Start(); err != nil {
err = fmt.Errorf("error starting stack: %v", err)
}
return stack, err
}
const (
envStatusURL = "_P2P_STATUS_URL"
envNodeConfig = "_P2P_NODE_CONFIG"
)
// nodeStartupJSON is sent to the simulation host after startup.
type nodeStartupJSON struct {
Err string
WSEndpoint string
NodeInfo *p2p.NodeInfo
}
// snapshotService is a node.Service which wraps a list of services and
// exposes an API to generate a snapshot of those services
type snapshotService struct {
services map[string]node.Service
}
func (s *snapshotService) APIs() []rpc.API {
return []rpc.API{{
Namespace: "simulation",
Version: "1.0",
Service: SnapshotAPI{s.services},
}}
}
func (s *snapshotService) Protocols() []p2p.Protocol {
return nil
}
func (s *snapshotService) Start(*p2p.Server) error {
return nil
}
func (s *snapshotService) Stop() error {
return nil
}
// SnapshotAPI provides an RPC method to create snapshots of services
type SnapshotAPI struct {
services map[string]node.Service
}
func (api SnapshotAPI) Snapshot() (map[string][]byte, error) {
snapshots := make(map[string][]byte)
for name, service := range api.services {
if s, ok := service.(interface {
Snapshot() ([]byte, error)
}); ok {
snap, err := s.Snapshot()
if err != nil {
return nil, err
}
snapshots[name] = snap
}
}
return snapshots, nil
}
type wsRPCDialer struct {
addrs map[string]string
}
// DialRPC implements the RPCDialer interface by creating a WebSocket RPC
// client of the given node
func (w *wsRPCDialer) DialRPC(id enode.ID) (*rpc.Client, error) {
addr, ok := w.addrs[id.String()]
if !ok {
return nil, fmt.Errorf("unknown node: %s", id)
}
return rpc.DialWebsocket(context.Background(), addr, "http://localhost")
}