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https://github.com/gopl-zh/gopl-zh.github.com.git
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40 lines
742 B
Go
40 lines
742 B
Go
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// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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// See page 227.
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// Netcat is a simple read/write client for TCP servers.
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package main
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import (
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"io"
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"log"
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"net"
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"os"
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)
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//!+
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func main() {
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conn, err := net.Dial("tcp", "localhost:8000")
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if err != nil {
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log.Fatal(err)
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}
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done := make(chan struct{})
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go func() {
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io.Copy(os.Stdout, conn) // NOTE: ignoring errors
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log.Println("done")
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done <- struct{}{} // signal the main goroutine
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}()
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mustCopy(conn, os.Stdin)
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conn.Close()
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<-done // wait for background goroutine to finish
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}
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//!-
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func mustCopy(dst io.Writer, src io.Reader) {
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if _, err := io.Copy(dst, src); err != nil {
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log.Fatal(err)
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}
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}
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