mirror of
https://github.com/gopl-zh/gopl-zh.github.com.git
synced 2024-11-05 05:53:45 +00:00
52 lines
932 B
Go
52 lines
932 B
Go
// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
|
|
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
|
|
|
|
// See page 223.
|
|
|
|
// Reverb1 is a TCP server that simulates an echo.
|
|
package main
|
|
|
|
import (
|
|
"bufio"
|
|
"fmt"
|
|
"log"
|
|
"net"
|
|
"strings"
|
|
"time"
|
|
)
|
|
|
|
//!+
|
|
func echo(c net.Conn, shout string, delay time.Duration) {
|
|
fmt.Fprintln(c, "\t", strings.ToUpper(shout))
|
|
time.Sleep(delay)
|
|
fmt.Fprintln(c, "\t", shout)
|
|
time.Sleep(delay)
|
|
fmt.Fprintln(c, "\t", strings.ToLower(shout))
|
|
}
|
|
|
|
func handleConn(c net.Conn) {
|
|
input := bufio.NewScanner(c)
|
|
for input.Scan() {
|
|
echo(c, input.Text(), 1*time.Second)
|
|
}
|
|
// NOTE: ignoring potential errors from input.Err()
|
|
c.Close()
|
|
}
|
|
|
|
//!-
|
|
|
|
func main() {
|
|
l, err := net.Listen("tcp", "localhost:8000")
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
for {
|
|
conn, err := l.Accept()
|
|
if err != nil {
|
|
log.Print(err) // e.g., connection aborted
|
|
continue
|
|
}
|
|
go handleConn(conn)
|
|
}
|
|
}
|