Example #1
0
func (s *server) Stop() error {
	s.stopOnce.Do(func() {
		defer stats.BumpTime(s.stats, "stop.time").End()
		stats.BumpSum(s.stats, "stop", 1)

		// first disable keep-alive for new connections
		s.server.SetKeepAlivesEnabled(false)

		// then close the listener so new connections can't connect come thru
		closeErr := s.listener.Close()
		<-s.serveDone

		// then trigger the background goroutine to stop and wait for it
		stopDone := make(chan struct{})
		s.stop <- stopDone

		// wait for stop
		select {
		case <-stopDone:
		case <-s.clock.After(s.stopTimeout):
			defer stats.BumpTime(s.stats, "kill.time").End()
			stats.BumpSum(s.stats, "kill", 1)

			// stop timed out, wait for kill
			killDone := make(chan struct{})
			s.kill <- killDone
			select {
			case <-killDone:
			case <-s.clock.After(s.killTimeout):
				// kill timed out, give up
				stats.BumpSum(s.stats, "kill.timeout", 1)
			}
		}

		if closeErr != nil && !isUseOfClosedError(closeErr) {
			stats.BumpSum(s.stats, "listener.close.error", 1)
			s.stopErr = closeErr
		}
	})
	return s.stopErr
}
Example #2
0
// ListenAndServe returns a Server for the given http.Server. It is equivalent
// to ListenAndServe from the standard library, but returns immediately.
// Requests will be accepted in a background goroutine. If the http.Server has
// a non-nil TLSConfig, a TLS enabled listener will be setup.
func (h HTTP) ListenAndServe(s *http.Server) (Server, error) {
	addr := s.Addr
	if addr == "" {
		if s.TLSConfig == nil {
			addr = ":http"
		} else {
			addr = ":https"
		}
	}
	l, err := net.Listen("tcp", addr)
	if err != nil {
		stats.BumpSum(h.Stats, "listen.error", 1)
		return nil, err
	}
	if s.TLSConfig != nil {
		l = tls.NewListener(l, s.TLSConfig)
	}
	return h.Serve(s, l), nil
}
Example #3
0
func (s *server) serve() {
	stats.BumpSum(s.stats, "serve", 1)
	s.serveErr <- s.server.Serve(s.listener)
	close(s.serveDone)
	close(s.serveErr)
}
Example #4
0
func (s *server) manage() {
	defer func() {
		close(s.new)
		close(s.active)
		close(s.idle)
		close(s.closed)
		close(s.stop)
		close(s.kill)
	}()

	var stopDone chan struct{}

	conns := map[net.Conn]http.ConnState{}
	var countNew, countActive, countIdle float64

	// decConn decrements the count associated with the current state of the
	// given connection.
	decConn := func(c net.Conn) {
		switch conns[c] {
		default:
			panic(fmt.Errorf("unknown existing connection: %s", c))
		case http.StateNew:
			countNew--
		case http.StateActive:
			countActive--
		case http.StateIdle:
			countIdle--
		}
	}

	// setup a ticker to report various values every minute. if we don't have a
	// Stats implementation provided, we Stop it so it never ticks.
	statsTicker := s.clock.Ticker(time.Minute)
	if s.stats == nil {
		statsTicker.Stop()
	}

	for {
		select {
		case <-statsTicker.C:
			// we'll only get here when s.stats is not nil
			s.stats.BumpAvg("http-state.new", countNew)
			s.stats.BumpAvg("http-state.active", countActive)
			s.stats.BumpAvg("http-state.idle", countIdle)
			s.stats.BumpAvg("http-state.total", countNew+countActive+countIdle)
		case c := <-s.new:
			conns[c] = http.StateNew
			countNew++
		case c := <-s.active:
			decConn(c)
			countActive++

			conns[c] = http.StateActive
		case c := <-s.idle:
			decConn(c)
			countIdle++

			conns[c] = http.StateIdle

			// if we're already stopping, close it
			if stopDone != nil {
				c.Close()
			}
		case c := <-s.closed:
			stats.BumpSum(s.stats, "conn.closed", 1)
			decConn(c)
			delete(conns, c)

			// if we're waiting to stop and are all empty, we just closed the last
			// connection and we're done.
			if stopDone != nil && len(conns) == 0 {
				close(stopDone)
				return
			}
		case stopDone = <-s.stop:
			// if we're already all empty, we're already done
			if len(conns) == 0 {
				close(stopDone)
				return
			}

			// close current idle connections right away
			for c, cs := range conns {
				if cs == http.StateIdle {
					c.Close()
				}
			}

			// continue the loop and wait for all the ConnState updates which will
			// eventually close(stopDone) and return from this goroutine.

		case killDone := <-s.kill:
			// force close all connections
			stats.BumpSum(s.stats, "kill.conn.count", float64(len(conns)))
			for c := range conns {
				c.Close()
			}

			// don't block the kill.
			close(killDone)

			// continue the loop and we wait for all the ConnState updates and will
			// return from this goroutine when we're all done. otherwise we'll try to
			// send those ConnState updates on closed channels.

		}
	}
}