package main import ( fmtlog "log" "net" "net/http" "net/url" "os" "os/signal" "reflect" "strings" "syscall" "time" "github.com/BurntSushi/toml" log "github.com/Sirupsen/logrus" "github.com/codegangsta/negroni" "github.com/emilevauge/traefik/middlewares" "github.com/gorilla/mux" "github.com/mailgun/manners" "github.com/mailgun/oxy/cbreaker" "github.com/mailgun/oxy/forward" "github.com/mailgun/oxy/roundrobin" "github.com/thoas/stats" "github.com/unrolled/render" "gopkg.in/alecthomas/kingpin.v2" "runtime" ) var ( globalConfigFile = kingpin.Arg("conf", "Main configration file.").Default("traefik.toml").String() currentConfiguration = new(Configuration) metrics = stats.New() oxyLogger = &OxyLogger{} templatesRenderer = render.New(render.Options{ Directory: "templates", Asset: Asset, AssetNames: AssetNames, }) ) func main() { runtime.GOMAXPROCS(runtime.NumCPU()) kingpin.Parse() fmtlog.SetFlags(fmtlog.Lshortfile | fmtlog.LstdFlags) var srv *manners.GracefulServer var configurationRouter *mux.Router var configurationChan = make(chan *Configuration, 10) defer close(configurationChan) var sigs = make(chan os.Signal, 1) defer close(sigs) var stopChan = make(chan bool) defer close(stopChan) var providers = []Provider{} signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM) // load global configuration globalConfiguration := LoadFileConfig(*globalConfigFile) loggerMiddleware := middlewares.NewLogger(globalConfiguration.AccessLogsFile) defer loggerMiddleware.Close() // logging level, err := log.ParseLevel(strings.ToLower(globalConfiguration.LogLevel)) if err != nil { log.Fatal("Error getting level", err) } log.SetLevel(level) if len(globalConfiguration.TraefikLogsFile) > 0 { fi, err := os.OpenFile(globalConfiguration.TraefikLogsFile, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666) defer fi.Close() if err != nil { log.Fatal("Error opening file", err) } else { log.SetOutput(fi) log.SetFormatter(&log.TextFormatter{DisableColors: true, FullTimestamp: true, DisableSorting: true}) } } else { log.SetFormatter(&log.TextFormatter{FullTimestamp: true, DisableSorting: true}) } configurationRouter = LoadDefaultConfig(globalConfiguration) // listen new configurations from providers go func() { for { configuration := <-configurationChan log.Infof("Configuration receveived %+v", configuration) if configuration == nil { log.Info("Skipping empty configuration") } else if reflect.DeepEqual(currentConfiguration, configuration) { log.Info("Skipping same configuration") } else { newConfigurationRouter, err := LoadConfig(configuration, globalConfiguration) if err == nil { currentConfiguration = configuration configurationRouter = newConfigurationRouter oldServer := srv newsrv := prepareServer(configurationRouter, globalConfiguration, oldServer, loggerMiddleware, metrics) go startServer(newsrv, globalConfiguration) srv = newsrv time.Sleep(2 * time.Second) if oldServer != nil { log.Info("Stopping old server") oldServer.Close() } } else { log.Error("Error loading new configuration, aborted ", err) } } } }() // configure providers if globalConfiguration.Docker != nil { providers = append(providers, globalConfiguration.Docker) } if globalConfiguration.Marathon != nil { providers = append(providers, globalConfiguration.Marathon) } if globalConfiguration.File != nil { if len(globalConfiguration.File.Filename) == 0 { // no filename, setting to global config file globalConfiguration.File.Filename = *globalConfigFile } providers = append(providers, globalConfiguration.File) } if globalConfiguration.Web != nil { providers = append(providers, globalConfiguration.Web) } if globalConfiguration.Consul != nil { providers = append(providers, globalConfiguration.Consul) } // start providers for _, provider := range providers { log.Infof("Starting provider %v %+v", reflect.TypeOf(provider), provider) currentProvider := provider go func() { currentProvider.Provide(configurationChan) }() } go func() { sig := <-sigs log.Infof("I have to go... %+v", sig) log.Info("Stopping server") srv.Close() stopChan <- true }() //negroni.Use(middlewares.NewCircuitBreaker(oxyLogger)) //negroni.Use(middlewares.NewRoutes(configurationRouter)) srv = prepareServer(configurationRouter, globalConfiguration, nil, loggerMiddleware, metrics) go startServer(srv, globalConfiguration) <-stopChan log.Info("Shutting down") } func startServer(srv *manners.GracefulServer, globalConfiguration *GlobalConfiguration) { log.Info("Starting server") if len(globalConfiguration.CertFile) > 0 && len(globalConfiguration.KeyFile) > 0 { err := srv.ListenAndServeTLS(globalConfiguration.CertFile, globalConfiguration.KeyFile) if err != nil { netOpError, ok := err.(*net.OpError) if ok && netOpError.Err.Error() != "use of closed network connection" { log.Fatal("Error creating server: ", err) } } } else { err := srv.ListenAndServe() if err != nil { netOpError, ok := err.(*net.OpError) if ok && netOpError.Err.Error() != "use of closed network connection" { log.Fatal("Error creating server: ", err) } } } log.Info("Server stopped") } func prepareServer(router *mux.Router, globalConfiguration *GlobalConfiguration, oldServer *manners.GracefulServer, middlewares ...negroni.Handler) *manners.GracefulServer { log.Info("Preparing server") // middlewares var negroni = negroni.New() for _, middleware := range middlewares { negroni.Use(middleware) } negroni.UseHandler(router) if oldServer == nil { return manners.NewWithServer( &http.Server{ Addr: globalConfiguration.Port, Handler: negroni, }) } else { server, err := oldServer.HijackListener(&http.Server{ Addr: globalConfiguration.Port, Handler: negroni, }, nil) if err != nil { log.Fatalf("Error hijacking server %s", err) return nil } else { return server } } } func LoadConfig(configuration *Configuration, globalConfiguration *GlobalConfiguration) (*mux.Router, error) { router := mux.NewRouter() router.NotFoundHandler = http.HandlerFunc(notFoundHandler) backends := map[string]http.Handler{} for frontendName, frontend := range configuration.Frontends { log.Debugf("Creating frontend %s", frontendName) fwd, _ := forward.New(forward.Logger(oxyLogger)) newRoute := router.NewRoute().Name(frontendName) for routeName, route := range frontend.Routes { log.Debugf("Creating route %s %s:%s", routeName, route.Rule, route.Value) newRouteReflect := Invoke(newRoute, route.Rule, route.Value) newRoute = newRouteReflect[0].Interface().(*mux.Route) } if backends[frontend.Backend] == nil { log.Debugf("Creating backend %s", frontend.Backend) var lb http.Handler rr, _ := roundrobin.New(fwd) lbMethod, err := NewLoadBalancerMethod(configuration.Backends[frontend.Backend].LoadBalancer) if err != nil { configuration.Backends[frontend.Backend].LoadBalancer = &LoadBalancer{Method: "wrr"} } switch lbMethod { case drr: log.Debugf("Creating load-balancer drr") rebalancer, _ := roundrobin.NewRebalancer(rr, roundrobin.RebalancerLogger(oxyLogger)) lb = rebalancer for serverName, server := range configuration.Backends[frontend.Backend].Servers { url, err := url.Parse(server.URL) if err != nil { return nil, err } log.Debugf("Creating server %s %s", serverName, url.String()) rebalancer.UpsertServer(url, roundrobin.Weight(server.Weight)) } case wrr: log.Debugf("Creating load-balancer wrr") lb = rr for serverName, server := range configuration.Backends[frontend.Backend].Servers { url, err := url.Parse(server.URL) if err != nil { return nil, err } log.Debugf("Creating server %s %s", serverName, url.String()) rr.UpsertServer(url, roundrobin.Weight(server.Weight)) } } var negroni = negroni.New() if configuration.Backends[frontend.Backend].CircuitBreaker != nil { log.Debugf("Creating circuit breaker %s", configuration.Backends[frontend.Backend].CircuitBreaker.Expression) negroni.Use(middlewares.NewCircuitBreaker(lb, configuration.Backends[frontend.Backend].CircuitBreaker.Expression, cbreaker.Logger(oxyLogger))) } else { negroni.UseHandler(lb) } backends[frontend.Backend] = negroni } else { log.Debugf("Reusing backend %s", frontend.Backend) } // stream.New(backends[frontend.Backend], stream.Retry("IsNetworkError() && Attempts() <= " + strconv.Itoa(globalConfiguration.Replay)), stream.Logger(oxyLogger)) newRoute.Handler(backends[frontend.Backend]) err := newRoute.GetError() if err != nil { log.Error("Error building route: %s", err) } } return router, nil } func Invoke(any interface{}, name string, args ...interface{}) []reflect.Value { inputs := make([]reflect.Value, len(args)) for i := range args { inputs[i] = reflect.ValueOf(args[i]) } return reflect.ValueOf(any).MethodByName(name).Call(inputs) } func LoadFileConfig(file string) *GlobalConfiguration { configuration := NewGlobalConfiguration() if _, err := toml.DecodeFile(file, configuration); err != nil { log.Fatal("Error reading file ", err) } log.Debugf("Global configuration loaded %+v", configuration) return configuration }