func TrapCloser(cl io.Closer, cleanups ...Cleanup) {
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGINT, syscall.SIGKILL, syscall.SIGTERM, syscall.SIGHUP)
go func() {
for {
rawSig := <-c
sig, ok := rawSig.(syscall.Signal)
if !ok {
log.Fatal("not a unix signal")
}
switch {
case sig == syscall.SIGHUP:
log.Print("SIGHUP: restart process")
err := RestartProcess()
if err != nil {
log.Fatal("failed to restart: " + err.Error())
}
case sig == syscall.SIGINT || sig == syscall.SIGKILL || sig == syscall.SIGTERM:
log.Print("shutting down")
donec := make(chan bool)
go func() {
for _, cb := range cleanups {
if err := cb(); err != nil {
log.Error(err)
}
}
if err := cl.Close(); err != nil {
log.Fatalf("Error shutting down: %v", err)
}
donec <- true
}()
select {
case <-donec:
log.Printf("shutdown")
os.Exit(0)
case <-time.After(5 * time.Second):
log.Fatal("Timeout shutting down. Exiting uncleanly.")
}
default:
log.Fatal("Received another signal, should not happen.")
}
}
}()
}
func ListenAndServe(conf *config.Config) error {
setupServer(conf)
l, err := net.Listen("tcp", conf.Listen)
if err != nil {
return err
}
log.Printf("Listen on %s", l.Addr())
sig.TrapCloser(l)
err = http.Serve(l, nil)
log.Print("Shutting down ..")
return err
}