37 lines
912 B
Go
37 lines
912 B
Go
// Instead of using the default new.Listener this file will construct a custom
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// one. The main purpose for this is to have more control over the settings
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// (like keep-alive) and to retrieve the assigned port when using port 0.
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package app
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import (
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"fmt"
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"net"
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"time"
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)
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func newListener(cfg *ServerConfig) (net.Listener, error) {
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addr := fmt.Sprintf("%s:%d", cfg.Host, cfg.Port)
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ln, err := net.Listen("tcp", addr)
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if err != nil {
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return nil, err
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}
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// set actual port on config object (in case original port was 0)
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cfg.Port = ln.Addr().(*net.TCPAddr).Port
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return tcpListener{ln.(*net.TCPListener)}, nil
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}
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// custom TCP listener with keep-alive timeout
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type tcpListener struct {
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*net.TCPListener
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}
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func (ln tcpListener) Accept() (net.Conn, error) {
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tc, err := ln.AcceptTCP()
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if err != nil {
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return nil, err
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}
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tc.SetKeepAlive(true)
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tc.SetKeepAlivePeriod(3 * time.Minute)
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return tc, nil
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}
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