Example #1
0
func newProxy(cfg *config.Config) *route.Proxy {
	if err := route.SetPickerStrategy(cfg.Proxy.Strategy); err != nil {
		log.Fatal("[FATAL] ", err)
	}
	log.Printf("[INFO] Using routing strategy %q", cfg.Proxy.Strategy)

	tr := &http.Transport{
		ResponseHeaderTimeout: cfg.Proxy.ResponseHeaderTimeout,
		MaxIdleConnsPerHost:   cfg.Proxy.MaxConn,
		Dial: (&net.Dialer{
			Timeout:   cfg.Proxy.DialTimeout,
			KeepAlive: cfg.Proxy.KeepAliveTimeout,
		}).Dial,
	}

	return route.NewProxy(tr, cfg.Proxy)
}
Example #2
0
func TestGracefulShutdown(t *testing.T) {
	req := func(url string) int {
		resp, err := http.Get(url)
		if err != nil {
			t.Fatal(err)
		}
		defer resp.Body.Close()
		return resp.StatusCode
	}

	// start a server which responds after the shutdown has been triggered.
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		<-quit // wait for shutdown signal
		return
	}))
	defer srv.Close()

	// load the routing table
	tbl, err := route.ParseString("route add svc / " + srv.URL)
	if err != nil {
		t.Fatal(err)
	}
	route.SetTable(tbl)

	// start proxy with graceful shutdown period long enough
	// to complete one more request.
	var wg sync.WaitGroup
	l := config.Listen{Addr: "127.0.0.1:57777"}
	wg.Add(1)
	go func() {
		defer wg.Done()
		startListeners([]config.Listen{l}, 250*time.Millisecond, route.NewProxy(http.DefaultTransport, config.Proxy{}))
	}()

	// trigger shutdown after some time
	shutdownDelay := 100 * time.Millisecond
	go func() {
		time.Sleep(shutdownDelay)
		close(quit)
	}()

	// give proxy some time to start up
	// needs to be done before shutdown is triggered
	time.Sleep(shutdownDelay / 2)

	// make 200 OK request
	// start before and complete after shutdown was triggered
	if got, want := req("http://"+l.Addr+"/"), 200; got != want {
		t.Fatalf("request 1: got %v want %v", got, want)
	}

	// make 503 request
	// start and complete after shutdown was triggered
	if got, want := req("http://"+l.Addr+"/"), 503; got != want {
		t.Fatalf("got %v want %v", got, want)
	}

	// wait for listen() to return
	// note that the actual listeners have not returned yet
	wg.Wait()
}
Example #3
0
func main() {
	var cfg string
	var v bool
	flag.StringVar(&cfg, "cfg", "", "path to config file")
	flag.BoolVar(&v, "v", false, "show version")
	flag.Parse()

	if v {
		fmt.Println(version)
		return
	}

	log.Printf("[INFO] Version %s starting", version)

	if cfg != "" {
		if err := loadConfig(cfg); err != nil {
			log.Fatal("[FATAL] ", err)
		}
	}

	if err := metrics.Init(metricsTarget, metricsPrefix, metricsInterval, metricsGraphiteAddr); err != nil {
		log.Fatal("[FATAL] ", err)
	}

	if os.Getenv("GOMAXPROCS") == "" {
		log.Print("[INFO] Setting GOMAXPROCS=", gomaxprocs)
		runtime.GOMAXPROCS(gomaxprocs)
	} else {
		log.Print("[INFO] Using GOMAXPROCS=", os.Getenv("GOMAXPROCS"), " from env")
	}

	if os.Getenv("GOGC") == "" {
		log.Print("[INFO] Setting GOGC=", gogc)
		debug.SetGCPercent(gogc)
	} else {
		log.Print("[INFO] Using GOGC=", os.Getenv("GOGC"), " from env")
	}

	if proxyRoutes == "" {
		useDynamicRoutes()
	} else {
		useStaticRoutes()
	}

	if err := route.SetPickerStrategy(proxyStrategy); err != nil {
		log.Fatal("[FATAL] ", err)
	}

	consul.Addr = consulAddr
	consul.URL = consulURL

	dc, err := consul.Datacenter()
	if err != nil {
		log.Fatal("[FATAL] ", err)
	}

	log.Printf("[INFO] Using routing strategy %q", proxyStrategy)
	log.Printf("[INFO] Connecting to consul on %q in datacenter %q", consulAddr, dc)
	log.Printf("[INFO] Consul can be reached via %q", consulURL)

	log.Printf("[INFO] UI listening on %q", uiAddr)
	go func() {
		if err := ui.Start(uiAddr, consulKVPath); err != nil {
			log.Fatal("[FATAL] ui: ", err)
		}
	}()

	tr := &http.Transport{
		ResponseHeaderTimeout: proxyTimeout,
		MaxIdleConnsPerHost:   proxyMaxConn,
		Dial: (&net.Dialer{
			Timeout:   proxyDialTimeout,
			KeepAlive: proxyTimeout,
		}).Dial,
	}

	proxy := route.NewProxy(tr, proxyHeaderClientIP, proxyHeaderTLS, proxyHeaderTLSValue)
	listen(proxyAddr, proxyShutdownWait, proxy)
}