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package manners
import (
"net"
"sync"
)
func NewListener(l net.Listener, s *GracefulServer) *GracefulListener {
return &GracefulListener{l, true, s, sync.RWMutex{}}
}
// A GracefulListener differs from a standard net.Listener in one way: if
// Accept() is called after it is gracefully closed, it returns a
// listenerAlreadyClosed error. The GracefulServer will ignore this
// error.
type GracefulListener struct {
net.Listener
open bool
server *GracefulServer
rw sync.RWMutex
}
func (l *GracefulListener) Accept() (net.Conn, error) {
conn, err := l.Listener.Accept()
if err != nil {
l.rw.RLock()
defer l.rw.RUnlock()
if !l.open {
err = listenerAlreadyClosed{err}
}
return nil, err
}
return conn, nil
}
func (l *GracefulListener) Close() error {
l.rw.Lock()
defer l.rw.Unlock()
if !l.open {
return nil
}
l.open = false
err := l.Listener.Close()
return err
}
type listenerAlreadyClosed struct {
error
}
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