373 lines
13 KiB
Go
373 lines
13 KiB
Go
/*
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Copyright
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*/
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package main
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import (
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"crypto/tls"
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"errors"
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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/spf13/viper"
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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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"sync"
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"syscall"
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"time"
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)
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var oxyLogger = &OxyLogger{}
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// Server is the reverse-proxy/load-balancer engine
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type Server struct {
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srv *manners.GracefulServer
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configurationRouter *mux.Router
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configurationChan chan types.ConfigMessage
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configurationChanValidated chan types.ConfigMessage
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sigs chan os.Signal
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stopChan chan bool
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providers []provider.Provider
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serverLock sync.Mutex
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currentConfigurations configs
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globalConfiguration GlobalConfiguration
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loggerMiddleware *middlewares.Logger
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}
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// NewServer returns an initialized Server.
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func NewServer(globalConfiguration GlobalConfiguration) *Server {
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server := new(Server)
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server.configurationChan = make(chan types.ConfigMessage, 10)
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server.configurationChanValidated = make(chan types.ConfigMessage, 10)
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server.sigs = make(chan os.Signal, 1)
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server.stopChan = make(chan bool)
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server.providers = []provider.Provider{}
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signal.Notify(server.sigs, syscall.SIGINT, syscall.SIGTERM)
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server.currentConfigurations = make(configs)
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server.globalConfiguration = globalConfiguration
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server.loggerMiddleware = middlewares.NewLogger(globalConfiguration.AccessLogsFile)
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return server
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}
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// Start starts the server and blocks until server is shutted down.
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func (server *Server) Start() {
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server.configurationRouter = LoadDefaultConfig(server.globalConfiguration)
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go server.listenProviders()
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go server.enableRouter()
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server.configureProviders()
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server.startProviders()
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go server.listenSignals()
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var er error
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server.serverLock.Lock()
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server.srv, er = server.prepareServer(server.configurationRouter, server.globalConfiguration, nil, server.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 server.startServer(server.srv, server.globalConfiguration)
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//TODO change that!
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time.Sleep(100 * time.Millisecond)
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server.serverLock.Unlock()
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<-server.stopChan
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}
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// Stop stops the server
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func (server *Server) Stop() {
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server.srv.Close()
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server.stopChan <- true
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}
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// Close destroys the server
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func (server *Server) Close() {
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close(server.configurationChan)
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close(server.configurationChanValidated)
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close(server.sigs)
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close(server.stopChan)
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server.loggerMiddleware.Close()
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}
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func (server *Server) listenProviders() {
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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 := <-server.configurationChan
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log.Debugf("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(server.globalConfiguration.ProvidersThrottleDuration))) {
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log.Debugf("Last %s config received more than %s, OK", configMsg.ProviderName, server.globalConfiguration.ProvidersThrottleDuration)
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// last config received more than n s ago
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server.configurationChanValidated <- configMsg
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} else {
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log.Debugf("Last %s config received less than %s, waiting...", configMsg.ProviderName, server.globalConfiguration.ProvidersThrottleDuration)
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go func() {
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<-time.After(server.globalConfiguration.ProvidersThrottleDuration)
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if time.Now().After(lastReceivedConfiguration.Add(time.Duration(server.globalConfiguration.ProvidersThrottleDuration))) {
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log.Debugf("Waited for %s config, OK", configMsg.ProviderName)
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server.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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func (server *Server) enableRouter() {
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for {
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configMsg := <-server.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(server.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 server.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 := server.loadConfig(newConfigurations, server.globalConfiguration)
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if err == nil {
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server.serverLock.Lock()
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server.currentConfigurations = newConfigurations
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server.configurationRouter = newConfigurationRouter
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oldServer := server.srv
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newsrv, err := server.prepareServer(server.configurationRouter, server.globalConfiguration, oldServer, server.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 server.startServer(newsrv, server.globalConfiguration)
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server.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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server.serverLock.Unlock()
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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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func (server *Server) configureProviders() {
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// configure providers
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if server.globalConfiguration.Docker != nil {
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server.providers = append(server.providers, server.globalConfiguration.Docker)
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}
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if server.globalConfiguration.Marathon != nil {
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server.providers = append(server.providers, server.globalConfiguration.Marathon)
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}
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if server.globalConfiguration.File != nil {
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if len(server.globalConfiguration.File.Filename) == 0 {
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// no filename, setting to global config file
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server.globalConfiguration.File.Filename = viper.GetString("configFile")
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}
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server.providers = append(server.providers, server.globalConfiguration.File)
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}
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if server.globalConfiguration.Web != nil {
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server.globalConfiguration.Web.server = server
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server.providers = append(server.providers, server.globalConfiguration.Web)
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}
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if server.globalConfiguration.Consul != nil {
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server.providers = append(server.providers, server.globalConfiguration.Consul)
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}
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if server.globalConfiguration.Etcd != nil {
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server.providers = append(server.providers, server.globalConfiguration.Etcd)
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}
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if server.globalConfiguration.Zookeeper != nil {
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server.providers = append(server.providers, server.globalConfiguration.Zookeeper)
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}
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if server.globalConfiguration.Boltdb != nil {
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server.providers = append(server.providers, server.globalConfiguration.Boltdb)
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}
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}
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func (server *Server) startProviders() {
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// start providers
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for _, provider := range server.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(server.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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}
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func (server *Server) listenSignals() {
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sig := <-server.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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server.Stop()
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}
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// creates a TLS config that allows terminating HTTPS for multiple domains using SNI
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func (server *Server) createTLSConfig(certs []Certificate) (*tls.Config, error) {
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if len(certs) == 0 {
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return nil, nil
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}
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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, len(certs))
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for i, v := range certs {
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config.Certificates[i], err = tls.LoadX509KeyPair(v.CertFile, v.KeyFile)
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if err != nil {
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return nil, err
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}
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}
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// BuildNameToCertificate parses the CommonName and SubjectAlternateName fields
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// in each certificate and populates the config.NameToCertificate map.
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config.BuildNameToCertificate()
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return config, nil
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}
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func (server *Server) startServer(srv *manners.GracefulServer, globalConfiguration GlobalConfiguration) {
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log.Info("Starting server")
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if srv.TLSConfig != nil {
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err := srv.ListenAndServeTLSWithConfig(srv.TLSConfig)
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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 (server *Server) 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 := server.createTLSConfig(globalConfiguration.Certificates)
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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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gracefulServer, err := oldServer.HijackListener(&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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}, 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 gracefulServer, nil
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}
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// LoadConfig returns a new gorilla.mux Route from the specified global configuration and the dynamic
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// provider configurations.
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func (server *Server) 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.Infof("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.Infof("Creating route %s %s:%s", routeName, route.Rule, route.Value)
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newRouteReflect, err := invoke(newRoute, route.Rule, route.Value)
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if err != nil {
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return nil, err
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}
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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.Infof("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 at %s with weight %d", serverName, url.String(), server.Weight)
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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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