Logging

traefik.go

@@ -0,0 +1,229 @@
+package main
+
+import (
+	"github.com/gorilla/mux"
+	"github.com/mailgun/oxy/forward"
+	"github.com/mailgun/oxy/roundrobin"
+	"github.com/tylerb/graceful"
+	"net/http"
+	"net/url"
+	"os"
+	"os/signal"
+	"reflect"
+	"syscall"
+	"time"
+	"github.com/op/go-logging"
+	"github.com/BurntSushi/toml"
+	"github.com/gorilla/handlers"
+)
+
+var currentConfiguration = new(Configuration)
+var log = logging.MustGetLogger("traefik")
+
+func main() {
+	var srv *graceful.Server
+	var configurationRouter *mux.Router
+	var configurationChan = make(chan *Configuration)
+	var providers = []Provider{}
+	var format = logging.MustStringFormatter("%{color}%{time:15:04:05.000} %{shortfile:20.20s} %{level:8.8s} %{id:03x} ▶%{color:reset} %{message}")
+	var sigs = make(chan os.Signal, 1)
+	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
+
+	// load global configuration
+	globalConfigFile := "traefik.toml"
+	gloablConfiguration := LoadFileConfig(globalConfigFile)
+
+	// logging
+	backends := []logging.Backend{}
+	level, err := logging.LogLevel(gloablConfiguration.LogLevel)
+	if err != nil {
+		log.Fatal("Error getting level", err)
+	}
+	if (len(gloablConfiguration.TraefikLogsFile) > 0 ){
+		fi, err := os.OpenFile(gloablConfiguration.TraefikLogsFile, os.O_RDWR | os.O_CREATE | os.O_APPEND, 0666)
+		if err != nil {
+			log.Fatal("Error opening file", err)
+		}else{
+			logBackend := logging.NewLogBackend(fi, "", 0)
+			logBackendFormatter := logging.NewBackendFormatter(logBackend, logging.GlogFormatter)
+			logBackendLeveled := logging.AddModuleLevel(logBackend)
+			logBackendLeveled.SetLevel(level, "")
+			backends = append(backends, logBackendFormatter)
+		}
+	}
+	if (gloablConfiguration.TraefikLogsStdout){
+		logBackend := logging.NewLogBackend(os.Stdout, "", 0)
+		logBackendFormatter := logging.NewBackendFormatter(logBackend, format)
+		logBackendLeveled := logging.AddModuleLevel(logBackend)
+		logBackendLeveled.SetLevel(level, "")
+		backends = append(backends, logBackendFormatter)
+	}
+	logging.SetBackend(backends...)
+
+
+	configurationRouter = LoadDefaultConfig(gloablConfiguration)
+
+	// listen new configurations from providers
+	go func() {
+		for {
+			configuration := <-configurationChan
+			log.Info("Configuration receveived %+v", configuration)
+			if configuration == nil {
+				log.Info("Skipping empty configuration")
+			} else if (reflect.DeepEqual(currentConfiguration, configuration)) {
+				log.Info("Skipping same configuration")
+			} else {
+				currentConfiguration = configuration
+				configurationRouter = LoadConfig(configuration, gloablConfiguration)
+				srv.Stop(10 * time.Second)
+				time.Sleep(3 * time.Second)
+			}
+		}
+	}()
+
+	// configure providers
+	if (gloablConfiguration.Docker != nil) {
+		providers = append(providers, gloablConfiguration.Docker)
+	}
+	if (gloablConfiguration.Marathon != nil) {
+		providers = append(providers, gloablConfiguration.Marathon)
+	}
+	if (gloablConfiguration.File != nil) {
+		if (len(gloablConfiguration.File.Filename) == 0) {
+			// no filename, setting to global config file
+			gloablConfiguration.File.Filename = globalConfigFile
+		}
+		providers = append(providers, gloablConfiguration.File)
+	}
+	if (gloablConfiguration.Web != nil) {
+		providers = append(providers, gloablConfiguration.Web)
+	}
+
+	// start providers
+	for _, provider := range providers {
+		log.Notice("Starting provider %v %+v", reflect.TypeOf(provider), provider)
+		currentProvider := provider
+		go func() {
+			currentProvider.Provide(configurationChan)
+		}()
+	}
+
+	goAway := false
+	go func() {
+		sig := <-sigs
+		log.Notice("I have to go... %+v", sig)
+		goAway = true
+		srv.Stop(time.Duration(gloablConfiguration.GraceTimeOut) * time.Second)
+	}()
+
+	for {
+		if goAway {
+			break
+		}
+		srv = &graceful.Server{
+			Timeout:          time.Duration(gloablConfiguration.GraceTimeOut) * time.Second,
+			NoSignalHandling: true,
+
+			Server: &http.Server{
+				Addr:    gloablConfiguration.Port,
+				Handler: configurationRouter,
+			},
+		}
+
+		go func() {
+			srv.ListenAndServe()
+		}()
+		log.Notice("Started")
+		<-srv.StopChan()
+		log.Notice("Stopped")
+	}
+}
+
+func notFoundHandler(w http.ResponseWriter, r *http.Request) {
+	renderer.HTML(w, http.StatusNotFound, "notFound", nil)
+}
+
+func LoadDefaultConfig(gloablConfiguration *GlobalConfiguration) *mux.Router {
+	router := mux.NewRouter()
+	if (len(gloablConfiguration.AccessLogsFile) > 0 ){
+		fi, err := os.OpenFile(gloablConfiguration.AccessLogsFile, os.O_RDWR | os.O_CREATE | os.O_APPEND, 0666)
+		if err != nil {
+			log.Fatal("Error opening file", err)
+		}
+		router.NotFoundHandler = handlers.CombinedLoggingHandler(fi, http.HandlerFunc(notFoundHandler))
+	}else{
+		router.NotFoundHandler = http.HandlerFunc(notFoundHandler)
+	}
+	return router
+}
+
+func LoadConfig(configuration *Configuration, gloablConfiguration *GlobalConfiguration) *mux.Router {
+	router := mux.NewRouter()
+	if (len(gloablConfiguration.AccessLogsFile) > 0 ){
+		fi, err := os.OpenFile(gloablConfiguration.AccessLogsFile, os.O_RDWR | os.O_CREATE | os.O_APPEND, 0666)
+		if err != nil {
+			log.Fatal("Error opening file", err)
+		}
+		router.NotFoundHandler = handlers.CombinedLoggingHandler(fi, http.HandlerFunc(notFoundHandler))
+	}else{
+		router.NotFoundHandler = http.HandlerFunc(notFoundHandler)
+	}
+	backends := map[string]http.Handler{}
+	for routeName, route := range configuration.Routes {
+		log.Debug("Creating route %s", routeName)
+		fwd, _ := forward.New()
+		newRoutes := []*mux.Route{}
+		for ruleName, rule := range route.Rules {
+			log.Debug("Creating rule %s", ruleName)
+			newRouteReflect := Invoke(router.NewRoute(), rule.Category, rule.Value)
+			newRoute := newRouteReflect[0].Interface().(*mux.Route)
+			newRoutes = append(newRoutes, newRoute)
+		}
+		if (backends[route.Backend] ==nil) {
+			log.Debug("Creating backend %s", route.Backend)
+			lb, _ := roundrobin.New(fwd)
+			rb, _ := roundrobin.NewRebalancer(lb)
+			for serverName, server := range configuration.Backends[route.Backend].Servers {
+				log.Debug("Creating server %s", serverName)
+				url, _ := url.Parse(server.Url)
+				rb.UpsertServer(url, roundrobin.Weight(server.Weight))
+			}
+			backends[route.Backend]=lb
+		}else {
+			log.Debug("Reusing backend", route.Backend)
+		}
+		for _, muxRoute := range newRoutes {
+			if (len(gloablConfiguration.AccessLogsFile) > 0 ){
+				fi, err := os.OpenFile(gloablConfiguration.AccessLogsFile, os.O_RDWR | os.O_CREATE | os.O_APPEND, 0666)
+				if err != nil {
+					log.Fatal("Error opening file", err)
+				}
+				muxRoute.Handler(handlers.CombinedLoggingHandler(fi, backends[route.Backend]))
+			}else{
+				muxRoute.Handler(backends[route.Backend])
+			}
+			err := muxRoute.GetError()
+			if err != nil {
+				log.Error("Error building route", err)
+			}
+		}
+	}
+	return router
+}
+
+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.Debug("Global configuration loaded %+v", configuration)
+	return configuration
+}