363 lines
12 KiB
Go
363 lines
12 KiB
Go
package main
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import (
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"crypto/tls"
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"errors"
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fmtlog "log"
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"net/http"
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"net/url"
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"os"
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"os/signal"
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"reflect"
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"runtime"
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"strings"
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"syscall"
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"time"
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log "github.com/Sirupsen/logrus"
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"github.com/codegangsta/negroni"
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"github.com/emilevauge/traefik/middlewares"
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"github.com/emilevauge/traefik/provider"
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"github.com/emilevauge/traefik/types"
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"github.com/gorilla/mux"
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"github.com/mailgun/manners"
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"github.com/mailgun/oxy/cbreaker"
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"github.com/mailgun/oxy/forward"
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"github.com/mailgun/oxy/roundrobin"
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"github.com/thoas/stats"
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"gopkg.in/alecthomas/kingpin.v2"
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)
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var (
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globalConfigFile = kingpin.Arg("conf", "Main configration file.").Default("traefik.toml").String()
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version = kingpin.Flag("version", "Get Version.").Short('v').Bool()
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currentConfigurations = make(configs)
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metrics = stats.New()
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oxyLogger = &OxyLogger{}
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)
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func main() {
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runtime.GOMAXPROCS(runtime.NumCPU())
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kingpin.Version(Version + " built on the " + BuildDate)
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kingpin.Parse()
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fmtlog.SetFlags(fmtlog.Lshortfile | fmtlog.LstdFlags)
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var srv *manners.GracefulServer
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var configurationRouter *mux.Router
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var configurationChan = make(chan types.ConfigMessage, 10)
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defer close(configurationChan)
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var configurationChanValidated = make(chan types.ConfigMessage, 10)
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defer close(configurationChanValidated)
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var sigs = make(chan os.Signal, 1)
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defer close(sigs)
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var stopChan = make(chan bool)
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defer close(stopChan)
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var providers = []provider.Provider{}
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signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
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// load global configuration
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globalConfiguration := LoadFileConfig(*globalConfigFile)
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loggerMiddleware := middlewares.NewLogger(globalConfiguration.AccessLogsFile)
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defer loggerMiddleware.Close()
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// logging
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level, err := log.ParseLevel(strings.ToLower(globalConfiguration.LogLevel))
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if err != nil {
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log.Fatal("Error getting level", err)
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}
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log.SetLevel(level)
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if len(globalConfiguration.TraefikLogsFile) > 0 {
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fi, err := os.OpenFile(globalConfiguration.TraefikLogsFile, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
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defer fi.Close()
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if err != nil {
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log.Fatal("Error opening file", err)
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} else {
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log.SetOutput(fi)
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log.SetFormatter(&log.TextFormatter{DisableColors: true, FullTimestamp: true, DisableSorting: true})
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}
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} else {
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log.SetFormatter(&log.TextFormatter{FullTimestamp: true, DisableSorting: true})
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}
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log.Debugf("Global configuration loaded %+v", globalConfiguration)
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configurationRouter = LoadDefaultConfig(globalConfiguration)
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// listen new configurations from providers
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go func() {
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lastReceivedConfiguration := time.Unix(0, 0)
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lastConfigs := make(map[string]*types.ConfigMessage)
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for {
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configMsg := <-configurationChan
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log.Infof("Configuration receveived from provider %s: %#v", configMsg.ProviderName, configMsg.Configuration)
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lastConfigs[configMsg.ProviderName] = &configMsg
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if time.Now().After(lastReceivedConfiguration.Add(time.Duration(globalConfiguration.ProvidersThrottleDuration))) {
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log.Infof("Last %s config received more than %s, OK", configMsg.ProviderName, globalConfiguration.ProvidersThrottleDuration)
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// last config received more than n s ago
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configurationChanValidated <- configMsg
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} else {
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log.Infof("Last %s config received less than %s, waiting...", configMsg.ProviderName, globalConfiguration.ProvidersThrottleDuration)
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go func() {
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<-time.After(globalConfiguration.ProvidersThrottleDuration)
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if time.Now().After(lastReceivedConfiguration.Add(time.Duration(globalConfiguration.ProvidersThrottleDuration))) {
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log.Infof("Waited for %s config, OK", configMsg.ProviderName)
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configurationChanValidated <- *lastConfigs[configMsg.ProviderName]
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}
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}()
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}
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lastReceivedConfiguration = time.Now()
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}
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}()
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go func() {
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for {
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configMsg := <-configurationChanValidated
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if configMsg.Configuration == nil {
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log.Info("Skipping empty Configuration")
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} else if reflect.DeepEqual(currentConfigurations[configMsg.ProviderName], configMsg.Configuration) {
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log.Info("Skipping same configuration")
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} else {
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// Copy configurations to new map so we don't change current if LoadConfig fails
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newConfigurations := make(configs)
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for k, v := range currentConfigurations {
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newConfigurations[k] = v
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}
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newConfigurations[configMsg.ProviderName] = configMsg.Configuration
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newConfigurationRouter, err := LoadConfig(newConfigurations, globalConfiguration)
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if err == nil {
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currentConfigurations = newConfigurations
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configurationRouter = newConfigurationRouter
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oldServer := srv
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newsrv, err := prepareServer(configurationRouter, globalConfiguration, oldServer, loggerMiddleware, metrics)
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if err != nil {
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log.Fatal("Error preparing server: ", err)
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}
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go startServer(newsrv, globalConfiguration)
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srv = newsrv
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time.Sleep(1 * time.Second)
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if oldServer != nil {
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log.Info("Stopping old server")
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oldServer.Close()
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}
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} else {
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log.Error("Error loading new configuration, aborted ", err)
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}
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}
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}
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}()
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// configure providers
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if globalConfiguration.Docker != nil {
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providers = append(providers, globalConfiguration.Docker)
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}
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if globalConfiguration.Marathon != nil {
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providers = append(providers, globalConfiguration.Marathon)
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}
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if globalConfiguration.File != nil {
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if len(globalConfiguration.File.Filename) == 0 {
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// no filename, setting to global config file
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globalConfiguration.File.Filename = *globalConfigFile
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}
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providers = append(providers, globalConfiguration.File)
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}
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if globalConfiguration.Web != nil {
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providers = append(providers, globalConfiguration.Web)
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}
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if globalConfiguration.Consul != nil {
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providers = append(providers, globalConfiguration.Consul)
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}
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if globalConfiguration.Etcd != nil {
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providers = append(providers, globalConfiguration.Etcd)
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}
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if globalConfiguration.Zookeeper != nil {
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providers = append(providers, globalConfiguration.Zookeeper)
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}
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if globalConfiguration.Boltdb != nil {
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providers = append(providers, globalConfiguration.Boltdb)
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}
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// start providers
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for _, provider := range providers {
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log.Infof("Starting provider %v %+v", reflect.TypeOf(provider), provider)
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currentProvider := provider
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go func() {
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err := currentProvider.Provide(configurationChan)
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if err != nil {
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log.Errorf("Error starting provider %s", err)
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}
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}()
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}
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go func() {
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sig := <-sigs
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log.Infof("I have to go... %+v", sig)
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log.Info("Stopping server")
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srv.Close()
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stopChan <- true
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}()
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//negroni.Use(middlewares.NewCircuitBreaker(oxyLogger))
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//negroni.Use(middlewares.NewRoutes(configurationRouter))
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var er error
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srv, er = prepareServer(configurationRouter, globalConfiguration, nil, loggerMiddleware, metrics)
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if er != nil {
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log.Fatal("Error preparing server: ", er)
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}
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go startServer(srv, globalConfiguration)
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<-stopChan
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log.Info("Shutting down")
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}
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func createTLSConfig(certFile string, keyFile string) (*tls.Config, error) {
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config := &tls.Config{}
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if config.NextProtos == nil {
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config.NextProtos = []string{"http/1.1"}
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}
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var err error
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config.Certificates = make([]tls.Certificate, 1)
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if len(certFile) > 0 && len(keyFile) > 0 {
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config.Certificates[0], err = tls.LoadX509KeyPair(certFile, keyFile)
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if err != nil {
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return nil, err
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}
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} else {
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return nil, nil
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}
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return config, nil
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}
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func startServer(srv *manners.GracefulServer, globalConfiguration *GlobalConfiguration) {
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log.Info("Starting server")
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if len(globalConfiguration.CertFile) > 0 && len(globalConfiguration.KeyFile) > 0 {
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err := srv.ListenAndServeTLS(globalConfiguration.CertFile, globalConfiguration.KeyFile)
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if err != nil {
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log.Fatal("Error creating server: ", err)
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}
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} else {
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err := srv.ListenAndServe()
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if err != nil {
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log.Fatal("Error creating server: ", err)
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}
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}
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log.Info("Server stopped")
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}
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func prepareServer(router *mux.Router, globalConfiguration *GlobalConfiguration, oldServer *manners.GracefulServer, middlewares ...negroni.Handler) (*manners.GracefulServer, error) {
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log.Info("Preparing server")
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// middlewares
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var negroni = negroni.New()
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for _, middleware := range middlewares {
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negroni.Use(middleware)
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}
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negroni.UseHandler(router)
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tlsConfig, err := createTLSConfig(globalConfiguration.CertFile, globalConfiguration.KeyFile)
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if err != nil {
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log.Fatalf("Error creating TLS config %s", err)
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return nil, err
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}
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if oldServer == nil {
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return manners.NewWithServer(
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&http.Server{
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Addr: globalConfiguration.Port,
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Handler: negroni,
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TLSConfig: tlsConfig,
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}), nil
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}
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server, err := oldServer.HijackListener(&http.Server{
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Addr: globalConfiguration.Port,
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Handler: negroni,
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}, tlsConfig)
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if err != nil {
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log.Fatalf("Error hijacking server %s", err)
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return nil, err
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}
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return server, nil
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}
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// LoadConfig returns a new gorrilla.mux Route from the specified global configuration and the dynamic
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// provider configurations.
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func LoadConfig(configurations configs, globalConfiguration *GlobalConfiguration) (*mux.Router, error) {
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router := mux.NewRouter()
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router.NotFoundHandler = http.HandlerFunc(notFoundHandler)
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backends := map[string]http.Handler{}
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for _, configuration := range configurations {
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for frontendName, frontend := range configuration.Frontends {
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log.Debugf("Creating frontend %s", frontendName)
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fwd, _ := forward.New(forward.Logger(oxyLogger), forward.PassHostHeader(frontend.PassHostHeader))
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newRoute := router.NewRoute().Name(frontendName)
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for routeName, route := range frontend.Routes {
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log.Debugf("Creating route %s %s:%s", routeName, route.Rule, route.Value)
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newRouteReflect := Invoke(newRoute, route.Rule, route.Value)
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newRoute = newRouteReflect[0].Interface().(*mux.Route)
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}
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if backends[frontend.Backend] == nil {
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log.Debugf("Creating backend %s", frontend.Backend)
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var lb http.Handler
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rr, _ := roundrobin.New(fwd)
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if configuration.Backends[frontend.Backend] == nil {
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return nil, errors.New("Backend not found: " + frontend.Backend)
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}
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lbMethod, err := types.NewLoadBalancerMethod(configuration.Backends[frontend.Backend].LoadBalancer)
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if err != nil {
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configuration.Backends[frontend.Backend].LoadBalancer = &types.LoadBalancer{Method: "wrr"}
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}
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switch lbMethod {
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case types.Drr:
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log.Infof("Creating load-balancer drr")
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rebalancer, _ := roundrobin.NewRebalancer(rr, roundrobin.RebalancerLogger(oxyLogger))
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lb = rebalancer
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for serverName, server := range configuration.Backends[frontend.Backend].Servers {
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url, err := url.Parse(server.URL)
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if err != nil {
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return nil, err
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}
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log.Infof("Creating server %s %s", serverName, url.String())
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rebalancer.UpsertServer(url, roundrobin.Weight(server.Weight))
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}
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case types.Wrr:
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log.Infof("Creating load-balancer wrr")
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lb = middlewares.NewWebsocketUpgrader(rr)
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for serverName, server := range configuration.Backends[frontend.Backend].Servers {
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url, err := url.Parse(server.URL)
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if err != nil {
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return nil, err
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}
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log.Infof("Creating server %s %s", serverName, url.String())
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rr.UpsertServer(url, roundrobin.Weight(server.Weight))
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}
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}
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var negroni = negroni.New()
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if configuration.Backends[frontend.Backend].CircuitBreaker != nil {
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log.Infof("Creating circuit breaker %s", configuration.Backends[frontend.Backend].CircuitBreaker.Expression)
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negroni.Use(middlewares.NewCircuitBreaker(lb, configuration.Backends[frontend.Backend].CircuitBreaker.Expression, cbreaker.Logger(oxyLogger)))
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} else {
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negroni.UseHandler(lb)
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}
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backends[frontend.Backend] = negroni
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} else {
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log.Infof("Reusing backend %s", frontend.Backend)
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}
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// stream.New(backends[frontend.Backend], stream.Retry("IsNetworkError() && Attempts() <= " + strconv.Itoa(globalConfiguration.Replay)), stream.Logger(oxyLogger))
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newRoute.Handler(backends[frontend.Backend])
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err := newRoute.GetError()
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if err != nil {
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log.Errorf("Error building route: %s", err)
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}
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}
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}
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return router, nil
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}
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// Invoke calls the specified method with the specified arguments on the specified interface.
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// It uses the go(lang) reflect package.
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func Invoke(any interface{}, name string, args ...interface{}) []reflect.Value {
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inputs := make([]reflect.Value, len(args))
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for i := range args {
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inputs[i] = reflect.ValueOf(args[i])
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}
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return reflect.ValueOf(any).MethodByName(name).Call(inputs)
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}
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