Created
July 6, 2020 06:29
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Sample TCP Chat Server
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| package main | |
| import ( | |
| "bytes" | |
| "io" | |
| "log" | |
| "net" | |
| ) | |
| type BroadCaster struct{} | |
| // implements io.Writer | |
| func (b BroadCaster) Write(p []byte) (int, error) { | |
| var cs []io.Writer | |
| for _, c := range clients { | |
| cs = append(cs, c) | |
| } | |
| n, err := io.Copy(io.MultiWriter(cs...), bytes.NewReader(p)) | |
| if err != nil { | |
| return 0, err | |
| } | |
| return int(n), nil | |
| } | |
| var clients map[int]net.Conn | |
| var broadCaster BroadCaster | |
| const listenAddr = "0.0.0.0:5900" | |
| func main() { | |
| clients = make(map[int]net.Conn) | |
| l, err := net.Listen("tcp", listenAddr) | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| id := 0 | |
| for { | |
| c, err := l.Accept() | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| clients[id] = c | |
| go start(id, c) | |
| id++ | |
| } | |
| } | |
| func start(id int, c io.ReadWriteCloser) { | |
| log.Printf("New Start: %d\n", id) | |
| errc := make(chan error) | |
| go cp(c, errc) | |
| select { | |
| case _ = <-errc: | |
| c.Close() | |
| delete(clients, id) | |
| } | |
| log.Printf("Close: %d\n", id) | |
| } | |
| func cp(c io.Reader, errc chan<- error) { | |
| _, err := io.Copy(broadCaster, c) | |
| errc <- err | |
| } |
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