#8

修改了下，用标准库的没必要自己封装 Listener ，直接 ConnState 处理就可以了，代码更新了

```golang
package main

import (
"context"
"fmt"
"net"
"net/http"
"os"
"os/signal"
"sync"
"time"

"github.com/lesismal/nbio/nbhttp"
)

var connections = sync.Map{}

func nbioOnEcho(w http.ResponseWriter, r *http.Request) {
res, ok := w.(*nbhttp.Response)
if ok {
conn := res.Parser.Processor.Conn()
yourData, ok := connections.Load(conn)
if ok {
fmt.Println("nbioServer onEcho:", yourData)
} else {
fmt.Println("nbioServer onEcho: not found connection")
}
}
w.Write([]byte(time.Now().Format("20060102 15:04:05")))
}

func nbioServer() {
mux := &http.ServeMux{}
mux.HandleFunc("/", nbioOnEcho)

engine := nbhttp.NewServer(nbhttp.Config{
Network: "tcp",
Addrs: []string{"localhost:8080"},
Handler: mux,
IOMod: nbhttp.IOModBlocking,
})
engine.OnOpen(func(conn net.Conn) {
fmt.Println("nbioServer onOpen:", conn.RemoteAddr())
yourData := "data: " + conn.RemoteAddr().String() // or other things
connections.Store(conn, yourData)
})
engine.OnClose(func(conn net.Conn, err error) {
connections.Delete(conn)
fmt.Println("nbioServer onClose:", conn.RemoteAddr(), err)
})

err := engine.Start()
if err != nil {
fmt.Printf("nbio.Start failed: %v\n", err)
return
}

interrupt := make(chan os.Signal, 1)
signal.Notify(interrupt, os.Interrupt)
<-interrupt

ctx, cancel := context.WithTimeout(context.Background(), time.Second*3)
defer cancel()
engine.Shutdown(ctx)
}

func netOnEcho(w http.ResponseWriter, r *http.Request) {
yourData, ok := connections.Load(r.RemoteAddr)
if ok {
fmt.Println("netServer onEcho:", yourData)
} else {
fmt.Println("netServer onEcho: not found connection " + r.RemoteAddr)
}
w.Write([]byte(time.Now().Format("20060102 15:04:05")))
}

func netServer() {
mux := &http.ServeMux{}
mux.HandleFunc("/", netOnEcho)

server := &http.Server{
Addr: "localhost:8080",
Handler: mux,
ConnState: func(conn net.Conn, state http.ConnState) {
switch state {

case http.StateNew:
fmt.Println("netServer onOpen:", conn.RemoteAddr())
remoteAddr := conn.RemoteAddr().String()
yourData := "data: " + remoteAddr // or other things
connections.Store(remoteAddr, yourData)
case http.StateActive:
case http.StateIdle:
case http.StateHijacked:
case http.StateClosed:
connections.Delete(conn)
fmt.Println("netServer onClose:", conn.RemoteAddr())
}
},
}
err := server.ListenAndServe()
fmt.Println("server exit:", err)
}

func main() {
netServer()
// nbioServer()
}
```