package main
import (
"net"
"fmt"
)
var ( maxRead = 1100
msgStop = []byte("cmdStop")
msgStart = []byte("cmdContinue")
)
func main() {
hostAndPort := "localhost:54321"
listener := initServer(hostAndPort)
for {
conn, err := ()
checkError(err, "Accept: ")
go connectionHandler(conn)
}
}
func initServer(hostAndPort string) * {
serverAddr, err := ("tcp", hostAndPort)
checkError(err, "Resolving address:port failed: '" + hostAndPort + "'")
listener, err := ("tcp", serverAddr)
checkError(err, "ListenTCP: ")
println("Listening to: ", ().String())
return listener
}
func connectionHandler(conn ) {
connFrom := ().String()
println("Connection from: ", connFrom)
talktoclients(conn)
for {
var ibuf []byte = make([]byte, maxRead + 1)
length, err := (ibuf[0:maxRead])
ibuf[maxRead] = 0 // to prevent overflow
switch err {
case nil:
handleMsg(length, err, ibuf)
default:
goto DISCONNECT
}
}
DISCONNECT:
err := ()
println("Closed connection:" , connFrom)
checkError(err, "Close:" )
}
func talktoclients(to ) {
wrote, err := (msgStart)
checkError(err, "Write: wrote " + string(wrote) + " bytes.")
}
func handleMsg(length int, err error, msg []byte) {
if length > 0 {
for i := 0; ; i++ {
if msg[i] == 0 {
break
}
}
("Received data: %v", string(msg[0:length]))
(" length:",length)
}
}
func checkError(error error, info string) {
if error != nil {
panic("ERROR: " + info + " " + ()) // terminate program
}
}