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| package main | |
| import ( | |
| "bufio" | |
| "fmt" | |
| "io" | |
| "net" | |
| "strings" | |
| "sync" | |
| ) | |
| func handleReq(conn net.Conn) error { | |
| reader := bufio.NewReader(conn) | |
| for { | |
| message, err := reader.ReadString('\n') | |
| if err != nil { | |
| return err | |
| } | |
| fmt.Print("Message Received:", string(message)) | |
| conn.Write([]byte(strings.ToUpper(message) + "\n")) | |
| } | |
| } | |
| func main() { | |
| fmt.Println("Launching server...") | |
| ln, _ := net.Listen("tcp", ":8081") | |
| defer ln.Close() | |
| count := 0 | |
| conns := make(chan net.Conn) | |
| errs := make(chan error) | |
| go func() { | |
| for { | |
| conn, _ := ln.Accept() | |
| conns <- conn | |
| } | |
| }() | |
| mutex := &sync.Mutex{} | |
| for { | |
| select { | |
| case conn := <-conns: | |
| mutex.Lock() | |
| count += 1 | |
| mutex.Unlock() | |
| println("active clients: ", count) | |
| go func(conn net.Conn) { | |
| err := handleReq(conn) | |
| if err != nil { | |
| conn.Close() | |
| errs <- err | |
| } | |
| }(conn) | |
| case err := <-errs: | |
| if err == io.EOF { | |
| mutex.Lock() | |
| count -= 1 | |
| mutex.Unlock() | |
| println("active clients: ", count) | |
| } else { | |
| println(err.Error()) | |
| } | |
| break | |
| } | |
| } | |
| } |
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