A Golang implementation TCP service example

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Package Mainimport ("FMT" "Net" "Time" "OS" "Os/signal" "Sync") const (Workercount = 2) type Task str UCT {Id int32 Message string}var wg sync. Waitgroupvar Taskchannel = Make (chan Task) var signchannel = make (Chan os. Signal, 1) var exitchanel = make (chan int) func main () {go installsign () tcpaddr, err: = Net. RESOLVETCPADDR ("TCP4", "127.0.0.1:2202") if err! = Nil {Panic ("Resolve IP Address failed:" + Err. Error ())} FMT. Println ("Listening 127.0.0.1:2202 ...") listener, err: = Net. LISTENTCP ("TCP", TCPADDR) if err! = Nil {Panic ("Listen TCP failed:" + Err. Error ())} FMT. Println ("Listen success on 127.0.0.1:2202 with TCP4") defer func () {fmt. Println ("Close listenning ...") listener. Close () fmt. Println ("Shutdown")} () Connchannel: = Make (chan net.            Conn) go accept (listener, Connchannel) go handleconn (connchannel) go Taskdispatch () for {select { Case <-Signchannel:fmt. PRintln ("Get shutdown sign") go Notifygoroutingexit () goto EXIT}} exit:fmt . Println ("Waiting gorouting exit ....") WG. Wait ()}func Accept (listener * Net. TcpListener, Connchannel Chan net. Conn) {for {connection, err: = Listener. ACCEPTTCP () if err! = Nil {fmt. Println ("Accept failed:" + err.) Error ())} else {Connchannel <-connection}}}func handleconn (Connchannel Chan net. Conn) {fmt. PRINTLN ("wating connection ...") for {select {case conn: = <-Connchannel:remot EADDR: = conn. Remoteaddr () fmt. Println ("Client" + remoteaddr.string () + "Connected") Readconn (&conn)}}}func Readconn (con N *net. Conn) {for {(*conn)}. Setreaddeadline (time. Now (). ADD (5 * time. Second)) Buf: = Make ([]byte, 1024x768) _, Err: = (*conn). Read (BUF) if err! = Nil {fmt. Println ("Read ConneCtion Error: "+ Err. Error ()) If Err. Error () = = "EOF" {(*conn).                Close (); Fmt. PRINTLN ("Close connection" + (*conn). Remoteaddr (). String ()) Break}} if buf! = nil {fmt. Printf ("Read Message from Connect:%s", String (BUF)) Writeconn (conn, buf) var task task T Ask. Id = 1 task. Message = string (BUF) Taskchannel <-Task}}}func writeconn (conn *net. Conn, msg []byte) {_, Err: = (*conn). Write (msg) if err! = Nil {fmt. PRINTLN ("Write connection error:" + Err.) Error ()) If Err. Error () = = "EOF" {(*conn).            Close (); Fmt. PRINTLN ("Close connection" + (*conn). Remoteaddr (). String ())}}}func Taskdispatch () {fmt. PRINTLN ("Init task Moniter ....") for I: = 0; i < Workercount; i + + {go loop ()} FMT. PRINTLN ("Init task Moniter done!")} Func loop () {Ticker: = time. Newticker(Ten * time. SECOND) WG. ADD (1) defer func () {defer WG. Done () defer ticker. Stop ()} () for {fmt. PRINTLN ("wating task ...") Select {Case task: = <-taskchannel:fmt. Println ("task comming:" + task.)            Message) break; Case <-Exitchanel:fmt.         Println ("Woker get exit Sign") Goto STOP//default:}//Epoll, read the task data, do not need to handle timeout conditions Select {//Case <-Ticker. C://FMT. Println (time. Now ().        String () + "No task after ten second")//break; }} STOP://todo:clear undo Task}func Installsign () {signal. Notify (Signchannel, OS. Interrupt, OS. Kill)}func Notifygoroutingexit () {for i: = 0; i < workercount; I + + {Exitchanel <-1}}