97 lines
2.2 KiB
Go
97 lines
2.2 KiB
Go
package listener
|
|
|
|
import (
|
|
"fmt"
|
|
"net"
|
|
"os"
|
|
"time"
|
|
|
|
"github.com/coreos/go-systemd/v22/activation"
|
|
log "github.com/sirupsen/logrus"
|
|
)
|
|
|
|
// tcpKeepAliveListener sets TCP keep-alive timeouts on accepted
|
|
// connections. It's used by ListenAndServe and ListenAndServeTLS so
|
|
// dead TCP connections (e.g. closing laptop mid-download) eventually
|
|
// go away.
|
|
// it is a plain copy-paste from net/http/server.go
|
|
type tcpKeepAliveListener struct {
|
|
*net.TCPListener
|
|
}
|
|
|
|
func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
|
|
tc, err := ln.AcceptTCP()
|
|
if err != nil {
|
|
return
|
|
}
|
|
err = tc.SetKeepAlive(true)
|
|
if err != nil {
|
|
return
|
|
}
|
|
err = tc.SetKeepAlivePeriod(3 * time.Minute)
|
|
if err != nil {
|
|
return
|
|
}
|
|
return tc, nil
|
|
}
|
|
|
|
// NewListener announces on laddr and net. Accepted values of the net are
|
|
// 'unix' and 'tcp'
|
|
func NewListener(net, laddr string) (net.Listener, error) {
|
|
listeners, err := activation.Listeners()
|
|
if err != nil {
|
|
return nil, fmt.Errorf("Socket activation failed: %v", err)
|
|
}
|
|
switch len(listeners) {
|
|
case 0:
|
|
// No socket-activation found
|
|
switch net {
|
|
case "unix":
|
|
return newUnixListener(laddr)
|
|
case "tcp", "": // an empty net means tcp
|
|
return newTCPListener(laddr)
|
|
default:
|
|
return nil, fmt.Errorf("unknown address type %s", net)
|
|
}
|
|
case 1:
|
|
log.Info("Using systemd socket activation instead of any configured network listeners")
|
|
return listeners[0], nil
|
|
default:
|
|
return nil, fmt.Errorf("Found %d socket-activation listeners, only expected 1", len(listeners))
|
|
}
|
|
}
|
|
|
|
func newUnixListener(laddr string) (net.Listener, error) {
|
|
fi, err := os.Stat(laddr)
|
|
if err == nil {
|
|
// the file exists.
|
|
// try to remove it if it's a socket
|
|
if !isSocket(fi.Mode()) {
|
|
return nil, fmt.Errorf("file %s exists and is not a socket", laddr)
|
|
}
|
|
|
|
if err := os.Remove(laddr); err != nil {
|
|
return nil, err
|
|
}
|
|
} else if !os.IsNotExist(err) {
|
|
// we can't do stat on the file.
|
|
// it means we can not remove it
|
|
return nil, err
|
|
}
|
|
|
|
return net.Listen("unix", laddr)
|
|
}
|
|
|
|
func isSocket(m os.FileMode) bool {
|
|
return m&os.ModeSocket != 0
|
|
}
|
|
|
|
func newTCPListener(laddr string) (net.Listener, error) {
|
|
ln, err := net.Listen("tcp", laddr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return tcpKeepAliveListener{ln.(*net.TCPListener)}, nil
|
|
}
|