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chat.go
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chat.go
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package main
import (
"bufio"
"fmt"
"log"
"net"
"strings"
"time"
)
type client struct {
name string
receiver chan<- string
}
var (
entering = make(chan client)
leaving = make(chan client)
messages = make(chan string)
)
func broadcaster() {
clients := make(map[client]bool)
for {
select {
case msg := <-messages:
for cli := range clients {
cli.receiver <- msg
}
case cli := <-entering:
if len(clients) != 0 {
var s strings.Builder
s.WriteString("all members:")
for c := range clients {
s.WriteString("\n")
s.WriteString(c.name)
}
cli.receiver <- s.String()
}
clients[cli] = true
case cli := <-leaving:
delete(clients, cli)
close(cli.receiver)
}
}
}
func handleConn(conn net.Conn) {
ch := make(chan string)
keep := make(chan struct{})
go clientWriter(conn, ch)
go keepConnection(conn, keep)
conn.Write([]byte("what's your name?\n"))
input := bufio.NewScanner(conn)
var name string
for input.Scan() {
name = input.Text()
if len(name) != 0 {
break
}
}
ch <- "You are " + name
messages <- name + " has arrived"
c := client{name, ch}
entering <- c
for input.Scan() {
messages <- name + ": " + input.Text()
keep <- struct{}{}
}
leaving <- c
messages <- name + " has left"
one := []byte{}
// 2重でCloseすることを防止する
_, err := conn.Read(one)
if err != nil {
return
}
conn.Close()
}
func clientWriter(conn net.Conn, ch <-chan string) {
for msg := range ch {
fmt.Fprintln(conn, msg)
}
}
func keepConnection(conn net.Conn, keep <-chan struct{}) {
for {
select {
case <-keep:
continue
case <-time.After(5 * time.Minute):
conn.Close()
return
}
}
}
func main() {
listener, err := net.Listen("tcp", "localhost:8000")
if err != nil {
log.Fatal(err)
}
go broadcaster()
for {
conn, err := listener.Accept()
if err != nil {
log.Print(err)
continue
}
go handleConn(conn)
}
}