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ping-pong.go
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ping-pong.go
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//此源码被清华学神尹成大魔王专业翻译分析并修改
//尹成QQ77025077
//尹成微信18510341407
//尹成所在QQ群721929980
//尹成邮箱 yinc13@mails.tsinghua.edu.cn
//尹成毕业于清华大学,微软区块链领域全球最有价值专家
//https://mvp.microsoft.com/zh-cn/PublicProfile/4033620
//版权所有2017 Go Ethereum作者
//此文件是Go以太坊库的一部分。
//
//Go-Ethereum库是免费软件:您可以重新分发它和/或修改
//根据GNU发布的较低通用公共许可证的条款
//自由软件基金会,或者许可证的第3版,或者
//(由您选择)任何更高版本。
//
//Go以太坊图书馆的发行目的是希望它会有用,
//但没有任何保证;甚至没有
//适销性或特定用途的适用性。见
//GNU较低的通用公共许可证,了解更多详细信息。
//
//你应该收到一份GNU较低级别的公共许可证副本
//以及Go以太坊图书馆。如果没有,请参见<http://www.gnu.org/licenses/>。
package main
import (
"flag"
"fmt"
"io/ioutil"
"net/http"
"os"
"sync/atomic"
"time"
"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/p2p/simulations"
"github.com/ethereum/go-ethereum/p2p/simulations/adapters"
"github.com/ethereum/go-ethereum/rpc"
)
var adapterType = flag.String("adapter", "sim", `node adapter to use (one of "sim", "exec" or "docker")`)
//main()启动一个模拟网络,其中包含运行简单
//乒乓协议
func main() {
flag.Parse()
//将日志级别设置为跟踪
log.Root().SetHandler(log.LvlFilterHandler(log.LvlTrace, log.StreamHandler(os.Stderr, log.TerminalFormat(false))))
//注册单个乒乓球服务
services := map[string]adapters.ServiceFunc{
"ping-pong": func(ctx *adapters.ServiceContext) (node.Service, error) {
return newPingPongService(ctx.Config.ID), nil
},
}
adapters.RegisterServices(services)
//创建节点适配器
var adapter adapters.NodeAdapter
switch *adapterType {
case "sim":
log.Info("using sim adapter")
adapter = adapters.NewSimAdapter(services)
case "exec":
tmpdir, err := ioutil.TempDir("", "p2p-example")
if err != nil {
log.Crit("error creating temp dir", "err", err)
}
defer os.RemoveAll(tmpdir)
log.Info("using exec adapter", "tmpdir", tmpdir)
adapter = adapters.NewExecAdapter(tmpdir)
default:
log.Crit(fmt.Sprintf("unknown node adapter %q", *adapterType))
}
//启动HTTP API
log.Info("starting simulation server on 0.0.0.0:8888...")
network := simulations.NewNetwork(adapter, &simulations.NetworkConfig{
DefaultService: "ping-pong",
})
if err := http.ListenAndServe(":8888", simulations.NewServer(network)); err != nil {
log.Crit("error starting simulation server", "err", err)
}
}
//PingpongService在每个节点之间运行一个乒乓协议
//每隔10秒向所有连接的对等机发送一次ping,并接收一个pong-in
//返回
type pingPongService struct {
id enode.ID
log log.Logger
received int64
}
func newPingPongService(id enode.ID) *pingPongService {
return &pingPongService{
id: id,
log: log.New("node.id", id),
}
}
func (p *pingPongService) Protocols() []p2p.Protocol {
return []p2p.Protocol{{
Name: "ping-pong",
Version: 1,
Length: 2,
Run: p.Run,
NodeInfo: p.Info,
}}
}
func (p *pingPongService) APIs() []rpc.API {
return nil
}
func (p *pingPongService) Start(server *p2p.Server) error {
p.log.Info("ping-pong service starting")
return nil
}
func (p *pingPongService) Stop() error {
p.log.Info("ping-pong service stopping")
return nil
}
func (p *pingPongService) Info() interface{} {
return struct {
Received int64 `json:"received"`
}{
atomic.LoadInt64(&p.received),
}
}
const (
pingMsgCode = iota
pongMsgCode
)
//run实现向对等端发送ping消息的乒乓协议
//每隔10秒,并用pong消息响应ping。
func (p *pingPongService) Run(peer *p2p.Peer, rw p2p.MsgReadWriter) error {
log := p.log.New("peer.id", peer.ID())
errC := make(chan error)
go func() {
for range time.Tick(10 * time.Second) {
log.Info("sending ping")
if err := p2p.Send(rw, pingMsgCode, "PING"); err != nil {
errC <- err
return
}
}
}()
go func() {
for {
msg, err := rw.ReadMsg()
if err != nil {
errC <- err
return
}
payload, err := ioutil.ReadAll(msg.Payload)
if err != nil {
errC <- err
return
}
log.Info("received message", "msg.code", msg.Code, "msg.payload", string(payload))
atomic.AddInt64(&p.received, 1)
if msg.Code == pingMsgCode {
log.Info("sending pong")
go p2p.Send(rw, pongMsgCode, "PONG")
}
}
}()
return <-errC
}