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listener.go
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/
listener.go
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package main
import (
"errors"
"net"
"time"
)
// stoppableListener sets TCP keep-alive timeouts on accepted
// connections and waits on stopc message
type stoppableListener struct {
*net.TCPListener
stopc <-chan struct{}
}
func newStoppableListener(addr string, stopc <-chan struct{}) (*stoppableListener, error) {
ln, err := net.Listen("tcp", addr)
if err != nil {
return nil, err
}
return &stoppableListener{ln.(*net.TCPListener), stopc}, nil
}
func (ln stoppableListener) Accept() (c net.Conn, err error) {
connc := make(chan *net.TCPConn, 1)
errc := make(chan error, 1)
go func() {
tc, err := ln.AcceptTCP()
if err != nil {
errc <- err
return
}
connc <- tc
}()
select {
case <-ln.stopc:
return nil, errors.New("server stopped")
case err := <-errc:
return nil, err
case tc := <-connc:
tc.SetKeepAlive(true)
tc.SetKeepAlivePeriod(3 * time.Minute)
return tc, nil
}
}