590 lines
21 KiB
Go
590 lines
21 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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"encoding/json"
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"errors"
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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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"regexp"
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"sort"
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"strconv"
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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/containous/oxy/cbreaker"
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"github.com/containous/oxy/connlimit"
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"github.com/containous/oxy/forward"
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"github.com/containous/oxy/roundrobin"
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"github.com/containous/oxy/stream"
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"github.com/containous/oxy/utils"
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"github.com/containous/traefik/middlewares"
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"github.com/containous/traefik/provider"
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"github.com/containous/traefik/safe"
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"github.com/containous/traefik/types"
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"github.com/gorilla/mux"
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"github.com/mailgun/manners"
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"github.com/streamrail/concurrent-map"
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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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serverEntryPoints serverEntryPoints
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configurationChan chan types.ConfigMessage
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configurationValidatedChan chan types.ConfigMessage
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signals chan os.Signal
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stopChan chan bool
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providers []provider.Provider
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currentConfigurations safe.Safe
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globalConfiguration GlobalConfiguration
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loggerMiddleware *middlewares.Logger
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routinesPool safe.Pool
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}
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type serverEntryPoints map[string]*serverEntryPoint
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type serverEntryPoint struct {
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httpServer *manners.GracefulServer
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httpRouter *middlewares.HandlerSwitcher
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}
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type serverRoute struct {
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route *mux.Route
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stripPrefixes []string
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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.serverEntryPoints = make(map[string]*serverEntryPoint)
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server.configurationChan = make(chan types.ConfigMessage, 10)
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server.configurationValidatedChan = make(chan types.ConfigMessage, 10)
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server.signals = make(chan os.Signal, 1)
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server.stopChan = make(chan bool, 1)
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server.providers = []provider.Provider{}
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signal.Notify(server.signals, syscall.SIGINT, syscall.SIGTERM)
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currentConfigurations := make(configs)
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server.currentConfigurations.Set(currentConfigurations)
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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.startHTTPServers()
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server.routinesPool.Go(func(stop chan bool) {
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server.listenProviders(stop)
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})
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server.routinesPool.Go(func(stop chan bool) {
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server.listenConfigurations(stop)
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})
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server.configureProviders()
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server.startProviders()
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go server.listenSignals()
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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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for _, serverEntryPoint := range server.serverEntryPoints {
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serverEntryPoint.httpServer.BlockingClose()
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}
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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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server.routinesPool.Stop()
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close(server.configurationChan)
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close(server.configurationValidatedChan)
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close(server.signals)
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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) startHTTPServers() {
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server.serverEntryPoints = server.buildEntryPoints(server.globalConfiguration)
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for newServerEntryPointName, newServerEntryPoint := range server.serverEntryPoints {
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newsrv, err := server.prepareServer(newServerEntryPointName, newServerEntryPoint.httpRouter, server.globalConfiguration.EntryPoints[newServerEntryPointName], nil, 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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serverEntryPoint := server.serverEntryPoints[newServerEntryPointName]
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serverEntryPoint.httpServer = newsrv
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go server.startServer(serverEntryPoint.httpServer, server.globalConfiguration)
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}
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}
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func (server *Server) listenProviders(stop chan bool) {
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lastReceivedConfiguration := safe.New(time.Unix(0, 0))
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lastConfigs := cmap.New()
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for {
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select {
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case <-stop:
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return
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case configMsg, ok := <-server.configurationChan:
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if !ok {
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return
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}
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jsonConf, _ := json.Marshal(configMsg.Configuration)
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log.Debugf("Configuration received from provider %s: %s", configMsg.ProviderName, string(jsonConf))
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lastConfigs.Set(configMsg.ProviderName, &configMsg)
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lastReceivedConfigurationValue := lastReceivedConfiguration.Get().(time.Time)
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if time.Now().After(lastReceivedConfigurationValue.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.configurationValidatedChan <- 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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server.routinesPool.Go(func(stop chan bool) {
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select {
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case <-stop:
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return
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case <-time.After(server.globalConfiguration.ProvidersThrottleDuration):
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lastReceivedConfigurationValue := lastReceivedConfiguration.Get().(time.Time)
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if time.Now().After(lastReceivedConfigurationValue.Add(time.Duration(server.globalConfiguration.ProvidersThrottleDuration))) {
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log.Debugf("Waited for %s config, OK", configMsg.ProviderName)
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if lastConfig, ok := lastConfigs.Get(configMsg.ProviderName); ok {
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server.configurationValidatedChan <- *lastConfig.(*types.ConfigMessage)
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}
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}
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}
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})
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}
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lastReceivedConfiguration.Set(time.Now())
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}
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}
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}
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func (server *Server) listenConfigurations(stop chan bool) {
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for {
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select {
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case <-stop:
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return
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case configMsg, ok := <-server.configurationValidatedChan:
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if !ok {
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return
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}
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currentConfigurations := server.currentConfigurations.Get().(configs)
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if configMsg.Configuration == nil {
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log.Infof("Skipping empty Configuration for provider %s", configMsg.ProviderName)
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} else if reflect.DeepEqual(currentConfigurations[configMsg.ProviderName], configMsg.Configuration) {
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log.Infof("Skipping same configuration for provider %s", configMsg.ProviderName)
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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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newServerEntryPoints, err := server.loadConfig(newConfigurations, server.globalConfiguration)
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if err == nil {
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for newServerEntryPointName, newServerEntryPoint := range newServerEntryPoints {
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server.serverEntryPoints[newServerEntryPointName].httpRouter.UpdateHandler(newServerEntryPoint.httpRouter.GetHandler())
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log.Infof("Server configuration reloaded on %s", server.serverEntryPoints[newServerEntryPointName].httpServer.Addr)
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}
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server.currentConfigurations.Set(newConfigurations)
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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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}
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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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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.ConsulCatalog != nil {
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server.providers = append(server.providers, server.globalConfiguration.ConsulCatalog)
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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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if server.globalConfiguration.Kubernetes != nil {
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server.providers = append(server.providers, server.globalConfiguration.Kubernetes)
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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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jsonConf, _ := json.Marshal(provider)
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log.Infof("Starting provider %v %s", reflect.TypeOf(provider), jsonConf)
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currentProvider := provider
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safe.Go(func() {
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err := currentProvider.Provide(server.configurationChan, &server.routinesPool)
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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.signals
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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(entryPointName string, tlsOption *TLS, router *middlewares.HandlerSwitcher) (*tls.Config, error) {
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if tlsOption == nil {
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return nil, nil
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}
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config := &tls.Config{}
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config.Certificates = []tls.Certificate{}
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for _, v := range tlsOption.Certificates {
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cert, 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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config.Certificates = append(config.Certificates, cert)
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}
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if server.globalConfiguration.ACME != nil {
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if _, ok := server.serverEntryPoints[server.globalConfiguration.ACME.EntryPoint]; ok {
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if entryPointName == server.globalConfiguration.ACME.EntryPoint {
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checkOnDemandDomain := func(domain string) bool {
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if router.GetHandler().Match(&http.Request{URL: &url.URL{}, Host: domain}, &mux.RouteMatch{}) {
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return true
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}
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return false
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}
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err := server.globalConfiguration.ACME.CreateConfig(config, checkOnDemandDomain)
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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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} else {
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return nil, errors.New("Unknown entrypoint " + server.globalConfiguration.ACME.EntryPoint + " for ACME configuration")
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}
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}
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if len(config.Certificates) == 0 {
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return nil, errors.New("No certificates found for TLS entrypoint " + entryPointName)
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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.Infof("Starting server on %s", srv.Addr)
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if srv.TLSConfig != nil {
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if err := srv.ListenAndServeTLSWithConfig(srv.TLSConfig); 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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if err := srv.ListenAndServe(); 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(entryPointName string, router *middlewares.HandlerSwitcher, entryPoint *EntryPoint, oldServer *manners.GracefulServer, middlewares ...negroni.Handler) (*manners.GracefulServer, error) {
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log.Infof("Preparing server %s %+v", entryPointName, entryPoint)
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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(entryPointName, entryPoint.TLS, router)
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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: entryPoint.Address,
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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: entryPoint.Address,
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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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func (server *Server) buildEntryPoints(globalConfiguration GlobalConfiguration) map[string]*serverEntryPoint {
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serverEntryPoints := make(map[string]*serverEntryPoint)
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for entryPointName := range globalConfiguration.EntryPoints {
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router := server.buildDefaultHTTPRouter()
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serverEntryPoints[entryPointName] = &serverEntryPoint{
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httpRouter: middlewares.NewHandlerSwitcher(router),
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}
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}
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return serverEntryPoints
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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) (map[string]*serverEntryPoint, error) {
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serverEntryPoints := server.buildEntryPoints(globalConfiguration)
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redirectHandlers := make(map[string]http.Handler)
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backends := map[string]http.Handler{}
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backend2FrontendMap := map[string]string{}
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for _, configuration := range configurations {
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frontendNames := sortedFrontendNamesForConfig(configuration)
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for _, frontendName := range frontendNames {
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frontend := configuration.Frontends[frontendName]
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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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saveBackend := middlewares.NewSaveBackend(fwd)
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// default endpoints if not defined in frontends
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if len(frontend.EntryPoints) == 0 {
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frontend.EntryPoints = globalConfiguration.DefaultEntryPoints
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}
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if len(frontend.EntryPoints) == 0 {
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log.Errorf("No entrypoint defined for frontend %s, defaultEntryPoints:%s. Skipping it", frontendName, globalConfiguration.DefaultEntryPoints)
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continue
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}
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for _, entryPointName := range frontend.EntryPoints {
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log.Debugf("Wiring frontend %s to entryPoint %s", frontendName, entryPointName)
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if _, ok := serverEntryPoints[entryPointName]; !ok {
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return nil, errors.New("Undefined entrypoint: " + entryPointName)
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}
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newServerRoute := &serverRoute{route: serverEntryPoints[entryPointName].httpRouter.GetHandler().NewRoute().Name(frontendName)}
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for routeName, route := range frontend.Routes {
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err := getRoute(newServerRoute, &route)
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if err != nil {
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return nil, err
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}
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log.Debugf("Creating route %s %s", routeName, route.Rule)
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}
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entryPoint := globalConfiguration.EntryPoints[entryPointName]
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if entryPoint.Redirect != nil {
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if redirectHandlers[entryPointName] != nil {
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newServerRoute.route.Handler(redirectHandlers[entryPointName])
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} else if handler, err := server.loadEntryPointConfig(entryPointName, entryPoint); err != nil {
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return nil, err
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} else {
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newServerRoute.route.Handler(handler)
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redirectHandlers[entryPointName] = handler
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}
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} else {
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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(saveBackend)
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if configuration.Backends[frontend.Backend] == nil {
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return nil, errors.New("Undefined backend: " + 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.Debugf("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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backend2FrontendMap[url.String()] = frontendName
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log.Debugf("Creating server %s at %s with weight %d", serverName, url.String(), server.Weight)
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if err := rebalancer.UpsertServer(url, roundrobin.Weight(server.Weight)); err != nil {
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return nil, err
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}
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}
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case types.Wrr:
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log.Debugf("Creating load-balancer wrr")
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lb = 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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backend2FrontendMap[url.String()] = frontendName
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log.Debugf("Creating server %s at %s with weight %d", serverName, url.String(), server.Weight)
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if err := rr.UpsertServer(url, roundrobin.Weight(server.Weight)); err != nil {
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return nil, err
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}
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}
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}
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maxConns := configuration.Backends[frontend.Backend].MaxConn
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if maxConns != nil && maxConns.Amount != 0 {
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extractFunc, err := utils.NewExtractor(maxConns.ExtractorFunc)
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if err != nil {
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return nil, err
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}
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log.Debugf("Creating loadd-balancer connlimit")
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lb, err = connlimit.New(lb, extractFunc, maxConns.Amount, connlimit.Logger(oxyLogger))
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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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// retry ?
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if globalConfiguration.Retry != nil {
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retries := len(configuration.Backends[frontend.Backend].Servers)
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if globalConfiguration.Retry.Attempts > 0 {
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retries = globalConfiguration.Retry.Attempts
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}
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maxMem := int64(2 * 1024 * 1024)
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if globalConfiguration.Retry.MaxMem > 0 {
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maxMem = globalConfiguration.Retry.MaxMem
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}
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lb, err = stream.New(lb,
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stream.Logger(oxyLogger),
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|
stream.Retry("IsNetworkError() && Attempts() < "+strconv.Itoa(retries)),
|
|
stream.MemRequestBodyBytes(maxMem),
|
|
stream.MaxRequestBodyBytes(maxMem),
|
|
stream.MemResponseBodyBytes(maxMem),
|
|
stream.MaxResponseBodyBytes(maxMem))
|
|
log.Debugf("Creating retries max attempts %d", retries)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
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)
|
|
}
|
|
server.wireFrontendBackend(newServerRoute, backends[frontend.Backend])
|
|
}
|
|
err := newServerRoute.route.GetError()
|
|
if err != nil {
|
|
log.Errorf("Error building route: %s", err)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
middlewares.SetBackend2FrontendMap(&backend2FrontendMap)
|
|
return serverEntryPoints, nil
|
|
}
|
|
|
|
func (server *Server) wireFrontendBackend(serverRoute *serverRoute, handler http.Handler) {
|
|
// strip prefix
|
|
if len(serverRoute.stripPrefixes) > 0 {
|
|
serverRoute.route.Handler(&middlewares.StripPrefix{
|
|
Prefixes: serverRoute.stripPrefixes,
|
|
Handler: handler,
|
|
})
|
|
} else {
|
|
serverRoute.route.Handler(handler)
|
|
}
|
|
}
|
|
|
|
func (server *Server) loadEntryPointConfig(entryPointName string, entryPoint *EntryPoint) (http.Handler, error) {
|
|
regex := entryPoint.Redirect.Regex
|
|
replacement := entryPoint.Redirect.Replacement
|
|
if len(entryPoint.Redirect.EntryPoint) > 0 {
|
|
regex = "^(?:https?:\\/\\/)?([\\da-z\\.-]+)(?::\\d+)?(.*)$"
|
|
if server.globalConfiguration.EntryPoints[entryPoint.Redirect.EntryPoint] == nil {
|
|
return nil, errors.New("Unknown entrypoint " + entryPoint.Redirect.EntryPoint)
|
|
}
|
|
protocol := "http"
|
|
if server.globalConfiguration.EntryPoints[entryPoint.Redirect.EntryPoint].TLS != nil {
|
|
protocol = "https"
|
|
}
|
|
r, _ := regexp.Compile("(:\\d+)")
|
|
match := r.FindStringSubmatch(server.globalConfiguration.EntryPoints[entryPoint.Redirect.EntryPoint].Address)
|
|
if len(match) == 0 {
|
|
return nil, errors.New("Bad Address format: " + server.globalConfiguration.EntryPoints[entryPoint.Redirect.EntryPoint].Address)
|
|
}
|
|
replacement = protocol + "://$1" + match[0] + "$2"
|
|
}
|
|
rewrite, err := middlewares.NewRewrite(regex, replacement, true)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
log.Debugf("Creating entryPoint redirect %s -> %s : %s -> %s", entryPointName, entryPoint.Redirect.EntryPoint, regex, replacement)
|
|
negroni := negroni.New()
|
|
negroni.Use(rewrite)
|
|
return negroni, nil
|
|
}
|
|
|
|
func (server *Server) buildDefaultHTTPRouter() *mux.Router {
|
|
router := mux.NewRouter()
|
|
router.NotFoundHandler = http.HandlerFunc(notFoundHandler)
|
|
router.StrictSlash(true)
|
|
return router
|
|
}
|
|
|
|
func getRoute(serverRoute *serverRoute, route *types.Route) error {
|
|
// ⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠
|
|
// TODO: backwards compatibility with DEPRECATED rule.Value
|
|
if len(route.Value) > 0 {
|
|
route.Rule += ":" + route.Value
|
|
log.Warnf("Value %s is DEPRECATED (will be removed in v1.0.0), please refer to the new frontend notation: https://github.com/containous/traefik/blob/master/docs/index.md#-frontends", route.Value)
|
|
}
|
|
// ⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠
|
|
|
|
rules := Rules{route: serverRoute}
|
|
newRoute, err := rules.Parse(route.Rule)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
serverRoute.route = newRoute
|
|
return nil
|
|
}
|
|
|
|
func sortedFrontendNamesForConfig(configuration *types.Configuration) []string {
|
|
keys := []string{}
|
|
for key := range configuration.Frontends {
|
|
keys = append(keys, key)
|
|
}
|
|
sort.Strings(keys)
|
|
return keys
|
|
}
|