func (f *frontend) rebuild() error { settings := f.frontend.HTTPSettings() // set up forwarder fwd, err := forward.New( forward.Logger(f.log), forward.RoundTripper(f.backend.transport), forward.Rewriter( &forward.HeaderRewriter{ Hostname: settings.Hostname, TrustForwardHeader: settings.TrustForwardHeader, }), forward.PassHostHeader(settings.PassHostHeader)) // rtwatcher will be observing and aggregating metrics watcher, err := NewWatcher(fwd) if err != nil { return err } // Create a load balancer rr, err := roundrobin.New(watcher) if err != nil { return err } // Rebalancer will readjust load balancer weights based on error ratios rb, err := roundrobin.NewRebalancer(rr, roundrobin.RebalancerLogger(f.log)) if err != nil { return err } // create middlewares sorted by priority and chain them middlewares := f.sortedMiddlewares() handlers := make([]http.Handler, len(middlewares)) for i, m := range middlewares { var prev http.Handler if i == 0 { prev = rb } else { prev = handlers[i-1] } h, err := m.Middleware.NewHandler(prev) if err != nil { return err } handlers[i] = h } var next http.Handler if len(handlers) != 0 { next = handlers[len(handlers)-1] } else { next = rb } // stream will retry and replay requests, fix encodings if settings.FailoverPredicate == "" { settings.FailoverPredicate = `IsNetworkError() && RequestMethod() == "GET" && Attempts() < 2` } str, err := stream.New(next, stream.Logger(f.log), stream.Retry(settings.FailoverPredicate), stream.MaxRequestBodyBytes(settings.Limits.MaxBodyBytes), stream.MemRequestBodyBytes(settings.Limits.MaxMemBodyBytes)) if err != nil { return err } if err := syncServers(f.mux, rb, f.backend, watcher); err != nil { return err } // Add the frontend to the router if err := f.mux.router.Handle(f.frontend.Route, str); err != nil { return err } f.lb = rb f.handler = str f.watcher = watcher return nil }
// LoadConfig returns a new gorilla.mux Route from the specified global configuration and the dynamic // provider configurations. func (server *Server) loadConfig(configurations configs, globalConfiguration GlobalConfiguration) (map[string]*serverEntryPoint, error) { serverEntryPoints := server.buildEntryPoints(globalConfiguration) redirectHandlers := make(map[string]http.Handler) backends := map[string]http.Handler{} backend2FrontendMap := map[string]string{} for _, configuration := range configurations { frontendNames := sortedFrontendNamesForConfig(configuration) frontend: for _, frontendName := range frontendNames { frontend := configuration.Frontends[frontendName] log.Debugf("Creating frontend %s", frontendName) fwd, err := forward.New(forward.Logger(oxyLogger), forward.PassHostHeader(frontend.PassHostHeader)) if err != nil { log.Errorf("Error creating forwarder for frontend %s: %v", frontendName, err) log.Errorf("Skipping frontend %s...", frontendName) continue frontend } saveBackend := middlewares.NewSaveBackend(fwd) if len(frontend.EntryPoints) == 0 { log.Errorf("No entrypoint defined for frontend %s, defaultEntryPoints:%s", frontendName, globalConfiguration.DefaultEntryPoints) log.Errorf("Skipping frontend %s...", frontendName) continue frontend } for _, entryPointName := range frontend.EntryPoints { log.Debugf("Wiring frontend %s to entryPoint %s", frontendName, entryPointName) if _, ok := serverEntryPoints[entryPointName]; !ok { log.Errorf("Undefined entrypoint '%s' for frontend %s", entryPointName, frontendName) log.Errorf("Skipping frontend %s...", frontendName) continue frontend } newServerRoute := &serverRoute{route: serverEntryPoints[entryPointName].httpRouter.GetHandler().NewRoute().Name(frontendName)} for routeName, route := range frontend.Routes { err := getRoute(newServerRoute, &route) if err != nil { log.Errorf("Error creating route for frontend %s: %v", frontendName, err) log.Errorf("Skipping frontend %s...", frontendName) continue frontend } log.Debugf("Creating route %s %s", routeName, route.Rule) } entryPoint := globalConfiguration.EntryPoints[entryPointName] if entryPoint.Redirect != nil { if redirectHandlers[entryPointName] != nil { newServerRoute.route.Handler(redirectHandlers[entryPointName]) } else if handler, err := server.loadEntryPointConfig(entryPointName, entryPoint); err != nil { log.Errorf("Error loading entrypoint configuration for frontend %s: %v", frontendName, err) log.Errorf("Skipping frontend %s...", frontendName) continue frontend } else { newServerRoute.route.Handler(handler) redirectHandlers[entryPointName] = handler } } else { if backends[frontend.Backend] == nil { log.Debugf("Creating backend %s", frontend.Backend) var lb http.Handler rr, _ := roundrobin.New(saveBackend) if configuration.Backends[frontend.Backend] == nil { log.Errorf("Undefined backend '%s' for frontend %s", frontend.Backend, frontendName) log.Errorf("Skipping frontend %s...", frontendName) continue frontend } lbMethod, err := types.NewLoadBalancerMethod(configuration.Backends[frontend.Backend].LoadBalancer) if err != nil { log.Errorf("Error loading load balancer method '%+v' for frontend %s: %v", configuration.Backends[frontend.Backend].LoadBalancer, frontendName, err) log.Errorf("Skipping frontend %s...", frontendName) continue frontend } stickysession := configuration.Backends[frontend.Backend].LoadBalancer.Sticky cookiename := "_TRAEFIK_BACKEND" var sticky *roundrobin.StickySession if stickysession { sticky = roundrobin.NewStickySession(cookiename) } switch lbMethod { case types.Drr: log.Debugf("Creating load-balancer drr") rebalancer, _ := roundrobin.NewRebalancer(rr, roundrobin.RebalancerLogger(oxyLogger)) if stickysession { log.Debugf("Sticky session with cookie %v", cookiename) rebalancer, _ = roundrobin.NewRebalancer(rr, roundrobin.RebalancerLogger(oxyLogger), roundrobin.RebalancerStickySession(sticky)) } lb = rebalancer for serverName, server := range configuration.Backends[frontend.Backend].Servers { url, err := url.Parse(server.URL) if err != nil { log.Errorf("Error parsing server URL %s: %v", server.URL, err) log.Errorf("Skipping frontend %s...", frontendName) continue frontend } backend2FrontendMap[url.String()] = frontendName log.Debugf("Creating server %s at %s with weight %d", serverName, url.String(), server.Weight) if err := rebalancer.UpsertServer(url, roundrobin.Weight(server.Weight)); err != nil { log.Errorf("Error adding server %s to load balancer: %v", server.URL, err) log.Errorf("Skipping frontend %s...", frontendName) continue frontend } } case types.Wrr: log.Debugf("Creating load-balancer wrr") if stickysession { log.Debugf("Sticky session with cookie %v", cookiename) rr, _ = roundrobin.New(saveBackend, roundrobin.EnableStickySession(sticky)) } lb = rr for serverName, server := range configuration.Backends[frontend.Backend].Servers { url, err := url.Parse(server.URL) if err != nil { log.Errorf("Error parsing server URL %s: %v", server.URL, err) log.Errorf("Skipping frontend %s...", frontendName) continue frontend } backend2FrontendMap[url.String()] = frontendName log.Debugf("Creating server %s at %s with weight %d", serverName, url.String(), server.Weight) if err := rr.UpsertServer(url, roundrobin.Weight(server.Weight)); err != nil { log.Errorf("Error adding server %s to load balancer: %v", server.URL, err) log.Errorf("Skipping frontend %s...", frontendName) continue frontend } } } maxConns := configuration.Backends[frontend.Backend].MaxConn if maxConns != nil && maxConns.Amount != 0 { extractFunc, err := utils.NewExtractor(maxConns.ExtractorFunc) if err != nil { log.Errorf("Error creating connlimit: %v", err) log.Errorf("Skipping frontend %s...", frontendName) continue frontend } log.Debugf("Creating loadd-balancer connlimit") lb, err = connlimit.New(lb, extractFunc, maxConns.Amount, connlimit.Logger(oxyLogger)) if err != nil { log.Errorf("Error creating connlimit: %v", err) log.Errorf("Skipping frontend %s...", frontendName) continue frontend } } // retry ? if globalConfiguration.Retry != nil { retries := len(configuration.Backends[frontend.Backend].Servers) if globalConfiguration.Retry.Attempts > 0 { retries = globalConfiguration.Retry.Attempts } lb = middlewares.NewRetry(retries, lb) log.Debugf("Creating retries max attempts %d", retries) } var negroni = negroni.New() if configuration.Backends[frontend.Backend].CircuitBreaker != nil { log.Debugf("Creating circuit breaker %s", configuration.Backends[frontend.Backend].CircuitBreaker.Expression) cbreaker, err := middlewares.NewCircuitBreaker(lb, configuration.Backends[frontend.Backend].CircuitBreaker.Expression, cbreaker.Logger(oxyLogger)) if err != nil { log.Errorf("Error creating circuit breaker: %v", err) log.Errorf("Skipping frontend %s...", frontendName) continue frontend } negroni.Use(cbreaker) } else { negroni.UseHandler(lb) } backends[frontend.Backend] = negroni } else { log.Debugf("Reusing backend %s", frontend.Backend) } if frontend.Priority > 0 { newServerRoute.route.Priority(frontend.Priority) } server.wireFrontendBackend(newServerRoute, backends[frontend.Backend]) } err := newServerRoute.route.GetError() if err != nil { log.Errorf("Error building route: %s", err) } } } } middlewares.SetBackend2FrontendMap(&backend2FrontendMap) //sort routes for _, serverEntryPoint := range serverEntryPoints { serverEntryPoint.httpRouter.GetHandler().SortRoutes() } return serverEntryPoints, nil }