traefik/server/server.go

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package server
import (
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"context"
"crypto/tls"
"crypto/x509"
"encoding/json"
"errors"
"io/ioutil"
"net"
"net/http"
"net/url"
"os"
"os/signal"
"reflect"
"regexp"
"sort"
"sync"
"time"
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"github.com/armon/go-proxyproto"
"github.com/containous/mux"
"github.com/containous/traefik/cluster"
"github.com/containous/traefik/configuration"
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"github.com/containous/traefik/healthcheck"
"github.com/containous/traefik/log"
"github.com/containous/traefik/metrics"
"github.com/containous/traefik/middlewares"
"github.com/containous/traefik/middlewares/accesslog"
"github.com/containous/traefik/provider"
"github.com/containous/traefik/safe"
"github.com/containous/traefik/types"
"github.com/streamrail/concurrent-map"
thoas_stats "github.com/thoas/stats"
"github.com/urfave/negroni"
"github.com/vulcand/oxy/cbreaker"
"github.com/vulcand/oxy/connlimit"
"github.com/vulcand/oxy/forward"
"github.com/vulcand/oxy/roundrobin"
"github.com/vulcand/oxy/utils"
"golang.org/x/net/http2"
)
var (
oxyLogger = &OxyLogger{}
)
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// Server is the reverse-proxy/load-balancer engine
type Server struct {
serverEntryPoints serverEntryPoints
configurationChan chan types.ConfigMessage
configurationValidatedChan chan types.ConfigMessage
signals chan os.Signal
stopChan chan bool
providers []provider.Provider
currentConfigurations safe.Safe
globalConfiguration configuration.GlobalConfiguration
accessLoggerMiddleware *accesslog.LogHandler
routinesPool *safe.Pool
leadership *cluster.Leadership
defaultForwardingRoundTripper http.RoundTripper
metricsRegistry metrics.Registry
}
type serverEntryPoints map[string]*serverEntryPoint
type serverEntryPoint struct {
httpServer *http.Server
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listener net.Listener
httpRouter *middlewares.HandlerSwitcher
}
type serverRoute struct {
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route *mux.Route
stripPrefixes []string
stripPrefixesRegex []string
addPrefix string
replacePath string
}
// NewServer returns an initialized Server.
func NewServer(globalConfiguration configuration.GlobalConfiguration) *Server {
server := new(Server)
server.serverEntryPoints = make(map[string]*serverEntryPoint)
server.configurationChan = make(chan types.ConfigMessage, 100)
server.configurationValidatedChan = make(chan types.ConfigMessage, 100)
server.signals = make(chan os.Signal, 1)
server.stopChan = make(chan bool, 1)
server.providers = []provider.Provider{}
server.configureSignals()
currentConfigurations := make(types.Configurations)
server.currentConfigurations.Set(currentConfigurations)
server.globalConfiguration = globalConfiguration
server.routinesPool = safe.NewPool(context.Background())
server.defaultForwardingRoundTripper = createHTTPTransport(globalConfiguration)
server.metricsRegistry = metrics.NewVoidRegistry()
if globalConfiguration.Web != nil && globalConfiguration.Web.Metrics != nil {
server.registerMetricClients(globalConfiguration.Web.Metrics)
}
if globalConfiguration.Cluster != nil {
// leadership creation if cluster mode
server.leadership = cluster.NewLeadership(server.routinesPool.Ctx(), globalConfiguration.Cluster)
}
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if globalConfiguration.AccessLogsFile != "" {
globalConfiguration.AccessLog = &types.AccessLog{FilePath: globalConfiguration.AccessLogsFile, Format: accesslog.CommonFormat}
}
if globalConfiguration.AccessLog != nil {
var err error
server.accessLoggerMiddleware, err = accesslog.NewLogHandler(globalConfiguration.AccessLog)
if err != nil {
log.Warnf("Unable to create log handler: %s", err)
}
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}
return server
}
// createHTTPTransport creates an http.Transport configured with the GlobalConfiguration settings.
// For the settings that can't be configured in Traefik it uses the default http.Transport settings.
// An exception to this is the MaxIdleConns setting as we only provide the option MaxIdleConnsPerHost
// in Traefik at this point in time. Setting this value to the default of 100 could lead to confusing
// behaviour and backwards compatibility issues.
func createHTTPTransport(globalConfiguration configuration.GlobalConfiguration) *http.Transport {
dialer := &net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
DualStack: true,
}
if globalConfiguration.ForwardingTimeouts != nil {
dialer.Timeout = time.Duration(globalConfiguration.ForwardingTimeouts.DialTimeout)
}
transport := &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: dialer.DialContext,
MaxIdleConnsPerHost: globalConfiguration.MaxIdleConnsPerHost,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
}
if globalConfiguration.ForwardingTimeouts != nil {
transport.ResponseHeaderTimeout = time.Duration(globalConfiguration.ForwardingTimeouts.ResponseHeaderTimeout)
}
if globalConfiguration.InsecureSkipVerify {
transport.TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
}
if len(globalConfiguration.RootCAs) > 0 {
transport.TLSClientConfig = &tls.Config{
RootCAs: createRootCACertPool(globalConfiguration.RootCAs),
}
http2.ConfigureTransport(transport)
}
return transport
}
func createRootCACertPool(rootCAs configuration.RootCAs) *x509.CertPool {
roots := x509.NewCertPool()
for _, cert := range rootCAs {
certContent, err := cert.Read()
if err != nil {
log.Error("Error while read RootCAs", err)
continue
}
roots.AppendCertsFromPEM(certContent)
}
return roots
}
// Start starts the server.
func (server *Server) Start() {
server.startHTTPServers()
server.startLeadership()
server.routinesPool.Go(func(stop chan bool) {
server.listenProviders(stop)
})
server.routinesPool.Go(func(stop chan bool) {
server.listenConfigurations(stop)
})
server.configureProviders()
server.startProviders()
go server.listenSignals()
}
// Wait blocks until server is shutted down.
func (server *Server) Wait() {
<-server.stopChan
}
// Stop stops the server
func (server *Server) Stop() {
defer log.Info("Server stopped")
var wg sync.WaitGroup
for sepn, sep := range server.serverEntryPoints {
wg.Add(1)
go func(serverEntryPointName string, serverEntryPoint *serverEntryPoint) {
defer wg.Done()
graceTimeOut := time.Duration(server.globalConfiguration.GraceTimeOut)
ctx, cancel := context.WithTimeout(context.Background(), graceTimeOut)
log.Debugf("Waiting %s seconds before killing connections on entrypoint %s...", graceTimeOut, serverEntryPointName)
if err := serverEntryPoint.httpServer.Shutdown(ctx); err != nil {
log.Debugf("Wait is over due to: %s", err)
serverEntryPoint.httpServer.Close()
}
cancel()
log.Debugf("Entrypoint %s closed", serverEntryPointName)
}(sepn, sep)
}
wg.Wait()
server.stopChan <- true
}
// Close destroys the server
func (server *Server) Close() {
ctx, cancel := context.WithTimeout(context.Background(), time.Duration(server.globalConfiguration.GraceTimeOut))
go func(ctx context.Context) {
<-ctx.Done()
if ctx.Err() == context.Canceled {
return
} else if ctx.Err() == context.DeadlineExceeded {
log.Warn("Timeout while stopping traefik, killing instance ✝")
os.Exit(1)
}
}(ctx)
stopMetricsClients()
server.stopLeadership()
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server.routinesPool.Cleanup()
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close(server.configurationChan)
close(server.configurationValidatedChan)
signal.Stop(server.signals)
close(server.signals)
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close(server.stopChan)
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if server.accessLoggerMiddleware != nil {
if err := server.accessLoggerMiddleware.Close(); err != nil {
log.Errorf("Error closing access log file: %s", err)
}
}
cancel()
}
func (server *Server) startLeadership() {
if server.leadership != nil {
server.leadership.Participate(server.routinesPool)
}
}
func (server *Server) stopLeadership() {
if server.leadership != nil {
server.leadership.Stop()
}
}
func (server *Server) startHTTPServers() {
server.serverEntryPoints = server.buildEntryPoints(server.globalConfiguration)
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for newServerEntryPointName, newServerEntryPoint := range server.serverEntryPoints {
serverEntryPoint := server.setupServerEntryPoint(newServerEntryPointName, newServerEntryPoint)
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go server.startServer(serverEntryPoint, server.globalConfiguration)
}
}
func (server *Server) setupServerEntryPoint(newServerEntryPointName string, newServerEntryPoint *serverEntryPoint) *serverEntryPoint {
serverMiddlewares := []negroni.Handler{middlewares.NegroniRecoverHandler()}
if server.accessLoggerMiddleware != nil {
serverMiddlewares = append(serverMiddlewares, server.accessLoggerMiddleware)
}
if server.metricsRegistry.IsEnabled() {
serverMiddlewares = append(serverMiddlewares, middlewares.NewMetricsWrapper(server.metricsRegistry, newServerEntryPointName))
}
if server.globalConfiguration.Web != nil {
server.globalConfiguration.Web.Stats = thoas_stats.New()
serverMiddlewares = append(serverMiddlewares, server.globalConfiguration.Web.Stats)
if server.globalConfiguration.Web.Statistics != nil {
server.globalConfiguration.Web.StatsRecorder = middlewares.NewStatsRecorder(server.globalConfiguration.Web.Statistics.RecentErrors)
serverMiddlewares = append(serverMiddlewares, server.globalConfiguration.Web.StatsRecorder)
}
}
if server.globalConfiguration.EntryPoints[newServerEntryPointName].Auth != nil {
authMiddleware, err := middlewares.NewAuthenticator(server.globalConfiguration.EntryPoints[newServerEntryPointName].Auth)
if err != nil {
log.Fatal("Error starting server: ", err)
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}
serverMiddlewares = append(serverMiddlewares, authMiddleware)
}
if server.globalConfiguration.EntryPoints[newServerEntryPointName].Compress {
serverMiddlewares = append(serverMiddlewares, &middlewares.Compress{})
}
if len(server.globalConfiguration.EntryPoints[newServerEntryPointName].WhitelistSourceRange) > 0 {
ipWhitelistMiddleware, err := middlewares.NewIPWhitelister(server.globalConfiguration.EntryPoints[newServerEntryPointName].WhitelistSourceRange)
if err != nil {
log.Fatal("Error starting server: ", err)
}
serverMiddlewares = append(serverMiddlewares, ipWhitelistMiddleware)
}
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newSrv, listener, err := server.prepareServer(newServerEntryPointName, server.globalConfiguration.EntryPoints[newServerEntryPointName], newServerEntryPoint.httpRouter, serverMiddlewares...)
if err != nil {
log.Fatal("Error preparing server: ", err)
}
serverEntryPoint := server.serverEntryPoints[newServerEntryPointName]
serverEntryPoint.httpServer = newSrv
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serverEntryPoint.listener = listener
return serverEntryPoint
}
func (server *Server) listenProviders(stop chan bool) {
lastReceivedConfiguration := safe.New(time.Unix(0, 0))
lastConfigs := cmap.New()
for {
select {
case <-stop:
return
case configMsg, ok := <-server.configurationChan:
if !ok {
return
}
server.defaultConfigurationValues(configMsg.Configuration)
currentConfigurations := server.currentConfigurations.Get().(types.Configurations)
jsonConf, _ := json.Marshal(configMsg.Configuration)
log.Debugf("Configuration received from provider %s: %s", configMsg.ProviderName, string(jsonConf))
if configMsg.Configuration == nil || configMsg.Configuration.Backends == nil && configMsg.Configuration.Frontends == nil {
log.Infof("Skipping empty Configuration for provider %s", configMsg.ProviderName)
} else if reflect.DeepEqual(currentConfigurations[configMsg.ProviderName], configMsg.Configuration) {
log.Infof("Skipping same configuration for provider %s", configMsg.ProviderName)
} else {
lastConfigs.Set(configMsg.ProviderName, &configMsg)
lastReceivedConfigurationValue := lastReceivedConfiguration.Get().(time.Time)
providersThrottleDuration := time.Duration(server.globalConfiguration.ProvidersThrottleDuration)
if time.Now().After(lastReceivedConfigurationValue.Add(providersThrottleDuration)) {
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log.Debugf("Last %s config received more than %s, OK", configMsg.ProviderName, server.globalConfiguration.ProvidersThrottleDuration.String())
// last config received more than n s ago
server.configurationValidatedChan <- configMsg
} else {
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log.Debugf("Last %s config received less than %s, waiting...", configMsg.ProviderName, server.globalConfiguration.ProvidersThrottleDuration.String())
safe.Go(func() {
<-time.After(providersThrottleDuration)
lastReceivedConfigurationValue := lastReceivedConfiguration.Get().(time.Time)
if time.Now().After(lastReceivedConfigurationValue.Add(time.Duration(providersThrottleDuration))) {
log.Debugf("Waited for %s config, OK", configMsg.ProviderName)
if lastConfig, ok := lastConfigs.Get(configMsg.ProviderName); ok {
server.configurationValidatedChan <- *lastConfig.(*types.ConfigMessage)
}
}
})
}
lastReceivedConfiguration.Set(time.Now())
}
}
}
}
func (server *Server) defaultConfigurationValues(configuration *types.Configuration) {
if configuration == nil || configuration.Frontends == nil {
return
}
server.configureFrontends(configuration.Frontends)
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server.configureBackends(configuration.Backends)
}
func (server *Server) listenConfigurations(stop chan bool) {
for {
select {
case <-stop:
return
case configMsg, ok := <-server.configurationValidatedChan:
if !ok {
return
}
currentConfigurations := server.currentConfigurations.Get().(types.Configurations)
// Copy configurations to new map so we don't change current if LoadConfig fails
newConfigurations := make(types.Configurations)
for k, v := range currentConfigurations {
newConfigurations[k] = v
}
newConfigurations[configMsg.ProviderName] = configMsg.Configuration
newServerEntryPoints, err := server.loadConfig(newConfigurations, server.globalConfiguration)
if err == nil {
for newServerEntryPointName, newServerEntryPoint := range newServerEntryPoints {
server.serverEntryPoints[newServerEntryPointName].httpRouter.UpdateHandler(newServerEntryPoint.httpRouter.GetHandler())
log.Infof("Server configuration reloaded on %s", server.serverEntryPoints[newServerEntryPointName].httpServer.Addr)
}
server.currentConfigurations.Set(newConfigurations)
server.postLoadConfig()
} else {
log.Error("Error loading new configuration, aborted ", err)
}
}
}
}
func (server *Server) postLoadConfig() {
if server.globalConfiguration.ACME == nil {
return
}
if server.leadership != nil && !server.leadership.IsLeader() {
return
}
if server.globalConfiguration.ACME.OnHostRule {
currentConfigurations := server.currentConfigurations.Get().(types.Configurations)
for _, config := range currentConfigurations {
for _, frontend := range config.Frontends {
// check if one of the frontend entrypoints is configured with TLS
// and is configured with ACME
ACMEEnabled := false
for _, entrypoint := range frontend.EntryPoints {
if server.globalConfiguration.ACME.EntryPoint == entrypoint && server.globalConfiguration.EntryPoints[entrypoint].TLS != nil {
ACMEEnabled = true
break
}
}
if ACMEEnabled {
for _, route := range frontend.Routes {
rules := Rules{}
domains, err := rules.ParseDomains(route.Rule)
if err != nil {
log.Errorf("Error parsing domains: %v", err)
} else {
server.globalConfiguration.ACME.LoadCertificateForDomains(domains)
}
}
}
}
}
}
}
func (server *Server) configureProviders() {
// configure providers
if server.globalConfiguration.Docker != nil {
server.providers = append(server.providers, server.globalConfiguration.Docker)
}
if server.globalConfiguration.Marathon != nil {
server.providers = append(server.providers, server.globalConfiguration.Marathon)
}
if server.globalConfiguration.File != nil {
server.providers = append(server.providers, server.globalConfiguration.File)
}
if server.globalConfiguration.Web != nil {
server.globalConfiguration.Web.CurrentConfigurations = &server.currentConfigurations
server.globalConfiguration.Web.Debug = server.globalConfiguration.Debug
server.providers = append(server.providers, server.globalConfiguration.Web)
}
if server.globalConfiguration.Consul != nil {
server.providers = append(server.providers, server.globalConfiguration.Consul)
}
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if server.globalConfiguration.ConsulCatalog != nil {
server.providers = append(server.providers, server.globalConfiguration.ConsulCatalog)
}
if server.globalConfiguration.Etcd != nil {
server.providers = append(server.providers, server.globalConfiguration.Etcd)
}
if server.globalConfiguration.Zookeeper != nil {
server.providers = append(server.providers, server.globalConfiguration.Zookeeper)
}
if server.globalConfiguration.Boltdb != nil {
server.providers = append(server.providers, server.globalConfiguration.Boltdb)
}
if server.globalConfiguration.Kubernetes != nil {
server.providers = append(server.providers, server.globalConfiguration.Kubernetes)
}
if server.globalConfiguration.Mesos != nil {
server.providers = append(server.providers, server.globalConfiguration.Mesos)
}
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if server.globalConfiguration.Eureka != nil {
server.providers = append(server.providers, server.globalConfiguration.Eureka)
}
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if server.globalConfiguration.ECS != nil {
server.providers = append(server.providers, server.globalConfiguration.ECS)
}
if server.globalConfiguration.Rancher != nil {
server.providers = append(server.providers, server.globalConfiguration.Rancher)
}
if server.globalConfiguration.DynamoDB != nil {
server.providers = append(server.providers, server.globalConfiguration.DynamoDB)
}
}
func (server *Server) startProviders() {
// start providers
for _, p := range server.providers {
providerType := reflect.TypeOf(p)
jsonConf, _ := json.Marshal(p)
log.Infof("Starting provider %v %s", providerType, jsonConf)
currentProvider := p
safe.Go(func() {
err := currentProvider.Provide(server.configurationChan, server.routinesPool, server.globalConfiguration.Constraints)
if err != nil {
log.Errorf("Error starting provider %v: %s", providerType, err)
}
})
}
}
func createClientTLSConfig(tlsOption *configuration.TLS) (*tls.Config, error) {
if tlsOption == nil {
return nil, errors.New("no TLS provided")
}
config, err := tlsOption.Certificates.CreateTLSConfig()
if err != nil {
return nil, err
}
if len(tlsOption.ClientCAFiles) > 0 {
pool := x509.NewCertPool()
for _, caFile := range tlsOption.ClientCAFiles {
data, err := ioutil.ReadFile(caFile)
if err != nil {
return nil, err
}
if !pool.AppendCertsFromPEM(data) {
return nil, errors.New("invalid certificate(s) in " + caFile)
}
}
config.RootCAs = pool
}
config.BuildNameToCertificate()
return config, nil
}
// creates a TLS config that allows terminating HTTPS for multiple domains using SNI
func (server *Server) createTLSConfig(entryPointName string, tlsOption *configuration.TLS, router *middlewares.HandlerSwitcher) (*tls.Config, error) {
if tlsOption == nil {
return nil, nil
}
config, err := tlsOption.Certificates.CreateTLSConfig()
if err != nil {
return nil, err
}
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// ensure http2 enabled
config.NextProtos = []string{"h2", "http/1.1"}
if len(tlsOption.ClientCAFiles) > 0 {
pool := x509.NewCertPool()
for _, caFile := range tlsOption.ClientCAFiles {
data, err := ioutil.ReadFile(caFile)
if err != nil {
return nil, err
}
ok := pool.AppendCertsFromPEM(data)
if !ok {
return nil, errors.New("invalid certificate(s) in " + caFile)
}
}
config.ClientCAs = pool
config.ClientAuth = tls.RequireAndVerifyClientCert
}
if server.globalConfiguration.ACME != nil {
if _, ok := server.serverEntryPoints[server.globalConfiguration.ACME.EntryPoint]; ok {
if entryPointName == server.globalConfiguration.ACME.EntryPoint {
checkOnDemandDomain := func(domain string) bool {
routeMatch := &mux.RouteMatch{}
router := router.GetHandler()
match := router.Match(&http.Request{URL: &url.URL{}, Host: domain}, routeMatch)
if match && routeMatch.Route != nil {
return true
}
return false
}
if server.leadership == nil {
err := server.globalConfiguration.ACME.CreateLocalConfig(config, checkOnDemandDomain)
if err != nil {
return nil, err
}
} else {
err := server.globalConfiguration.ACME.CreateClusterConfig(server.leadership, config, checkOnDemandDomain)
if err != nil {
return nil, err
}
}
}
} else {
return nil, errors.New("Unknown entrypoint " + server.globalConfiguration.ACME.EntryPoint + " for ACME configuration")
}
}
if len(config.Certificates) == 0 {
return nil, errors.New("No certificates found for TLS entrypoint " + entryPointName)
}
// BuildNameToCertificate parses the CommonName and SubjectAlternateName fields
// in each certificate and populates the config.NameToCertificate map.
config.BuildNameToCertificate()
//Set the minimum TLS version if set in the config TOML
if minConst, exists := configuration.MinVersion[server.globalConfiguration.EntryPoints[entryPointName].TLS.MinVersion]; exists {
config.PreferServerCipherSuites = true
config.MinVersion = minConst
}
//Set the list of CipherSuites if set in the config TOML
if server.globalConfiguration.EntryPoints[entryPointName].TLS.CipherSuites != nil {
//if our list of CipherSuites is defined in the entrypoint config, we can re-initilize the suites list as empty
config.CipherSuites = make([]uint16, 0)
for _, cipher := range server.globalConfiguration.EntryPoints[entryPointName].TLS.CipherSuites {
if cipherConst, exists := configuration.CipherSuites[cipher]; exists {
config.CipherSuites = append(config.CipherSuites, cipherConst)
} else {
//CipherSuite listed in the toml does not exist in our listed
return nil, errors.New("Invalid CipherSuite: " + cipher)
}
}
}
return config, nil
}
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func (server *Server) startServer(serverEntryPoint *serverEntryPoint, globalConfiguration configuration.GlobalConfiguration) {
log.Infof("Starting server on %s", serverEntryPoint.httpServer.Addr)
var err error
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if serverEntryPoint.httpServer.TLSConfig != nil {
err = serverEntryPoint.httpServer.ServeTLS(serverEntryPoint.listener, "", "")
} else {
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err = serverEntryPoint.httpServer.Serve(serverEntryPoint.listener)
}
if err != nil {
log.Error("Error creating server: ", err)
}
}
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func (server *Server) prepareServer(entryPointName string, entryPoint *configuration.EntryPoint, router *middlewares.HandlerSwitcher, middlewares ...negroni.Handler) (*http.Server, net.Listener, error) {
readTimeout, writeTimeout, idleTimeout := buildServerTimeouts(server.globalConfiguration)
log.Infof("Preparing server %s %+v with readTimeout=%s writeTimeout=%s idleTimeout=%s", entryPointName, entryPoint, readTimeout, writeTimeout, idleTimeout)
// middlewares
n := negroni.New()
for _, middleware := range middlewares {
n.Use(middleware)
}
n.UseHandler(router)
tlsConfig, err := server.createTLSConfig(entryPointName, entryPoint.TLS, router)
if err != nil {
log.Errorf("Error creating TLS config: %s", err)
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return nil, nil, err
}
listener, err := net.Listen("tcp", entryPoint.Address)
if err != nil {
log.Error("Error opening listener ", err)
}
if entryPoint.ProxyProtocol {
listener = &proxyproto.Listener{Listener: listener}
}
return &http.Server{
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Addr: entryPoint.Address,
Handler: n,
TLSConfig: tlsConfig,
ReadTimeout: readTimeout,
WriteTimeout: writeTimeout,
IdleTimeout: idleTimeout,
},
listener,
nil
}
func buildServerTimeouts(globalConfig configuration.GlobalConfiguration) (readTimeout, writeTimeout, idleTimeout time.Duration) {
readTimeout = time.Duration(0)
writeTimeout = time.Duration(0)
if globalConfig.RespondingTimeouts != nil {
readTimeout = time.Duration(globalConfig.RespondingTimeouts.ReadTimeout)
writeTimeout = time.Duration(globalConfig.RespondingTimeouts.WriteTimeout)
}
// When RespondingTimeouts.IdleTimout is configured, always use that setting
if globalConfig.RespondingTimeouts != nil {
idleTimeout = time.Duration(globalConfig.RespondingTimeouts.IdleTimeout)
} else if globalConfig.IdleTimeout != 0 {
// Backwards compatibility for deprecated IdleTimeout
idleTimeout = time.Duration(globalConfig.IdleTimeout)
} else {
// Default value if neither the deprecated IdleTimeout nor the new RespondingTimeouts.IdleTimout are configured
idleTimeout = time.Duration(configuration.DefaultIdleTimeout)
}
return readTimeout, writeTimeout, idleTimeout
}
func (server *Server) buildEntryPoints(globalConfiguration configuration.GlobalConfiguration) map[string]*serverEntryPoint {
serverEntryPoints := make(map[string]*serverEntryPoint)
for entryPointName := range globalConfiguration.EntryPoints {
router := server.buildDefaultHTTPRouter()
serverEntryPoints[entryPointName] = &serverEntryPoint{
httpRouter: middlewares.NewHandlerSwitcher(router),
}
}
return serverEntryPoints
}
// getRoundTripper will either use server.defaultForwardingRoundTripper or create a new one
// given a custom TLS configuration is passed and the passTLSCert option is set to true.
func (server *Server) getRoundTripper(globalConfiguration configuration.GlobalConfiguration, passTLSCert bool, tls *configuration.TLS) (http.RoundTripper, error) {
if passTLSCert {
tlsConfig, err := createClientTLSConfig(tls)
if err != nil {
log.Errorf("Failed to create TLSClientConfig: %s", err)
return nil, err
}
transport := createHTTPTransport(globalConfiguration)
transport.TLSClientConfig = tlsConfig
return transport, nil
}
return server.defaultForwardingRoundTripper, nil
}
// LoadConfig returns a new gorilla.mux Route from the specified global configuration and the dynamic
// provider configurations.
func (server *Server) loadConfig(configurations types.Configurations, globalConfiguration configuration.GlobalConfiguration) (map[string]*serverEntryPoint, error) {
serverEntryPoints := server.buildEntryPoints(globalConfiguration)
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redirectHandlers := make(map[string]negroni.Handler)
backends := map[string]http.Handler{}
backendsHealthCheck := map[string]*healthcheck.BackendHealthCheck{}
errorHandler := NewRecordingErrorHandler(middlewares.DefaultNetErrorRecorder{})
for _, config := range configurations {
frontendNames := sortedFrontendNamesForConfig(config)
frontend:
for _, frontendName := range frontendNames {
frontend := config.Frontends[frontendName]
log.Debugf("Creating frontend %s", frontendName)
if len(frontend.EntryPoints) == 0 {
log.Errorf("No entrypoint defined for frontend %s, defaultEntryPoints:%s", frontendName, globalConfiguration.DefaultEntryPoints)
log.Errorf("Skipping frontend %s...", frontendName)
continue frontend
}
for _, entryPointName := range frontend.EntryPoints {
log.Debugf("Wiring frontend %s to entryPoint %s", frontendName, entryPointName)
if _, ok := serverEntryPoints[entryPointName]; !ok {
log.Errorf("Undefined entrypoint '%s' for frontend %s", entryPointName, frontendName)
log.Errorf("Skipping frontend %s...", frontendName)
continue frontend
}
newServerRoute := &serverRoute{route: serverEntryPoints[entryPointName].httpRouter.GetHandler().NewRoute().Name(frontendName)}
for routeName, route := range frontend.Routes {
err := getRoute(newServerRoute, &route)
if err != nil {
log.Errorf("Error creating route for frontend %s: %v", frontendName, err)
log.Errorf("Skipping frontend %s...", frontendName)
continue frontend
}
log.Debugf("Creating route %s %s", routeName, route.Rule)
}
entryPoint := globalConfiguration.EntryPoints[entryPointName]
n := negroni.New()
if entryPoint.Redirect != nil {
if redirectHandlers[entryPointName] != nil {
n.Use(redirectHandlers[entryPointName])
} else if handler, err := server.loadEntryPointConfig(entryPointName, entryPoint); err != nil {
log.Errorf("Error loading entrypoint configuration for frontend %s: %v", frontendName, err)
log.Errorf("Skipping frontend %s...", frontendName)
continue frontend
} else {
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if server.accessLoggerMiddleware != nil {
saveFrontend := accesslog.NewSaveNegroniFrontend(handler, frontendName)
n.Use(saveFrontend)
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redirectHandlers[entryPointName] = saveFrontend
} else {
n.Use(handler)
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redirectHandlers[entryPointName] = handler
}
}
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}
if backends[entryPointName+frontend.Backend] == nil {
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log.Debugf("Creating backend %s", frontend.Backend)
roundTripper, err := server.getRoundTripper(globalConfiguration, frontend.PassTLSCert, entryPoint.TLS)
if err != nil {
log.Errorf("Failed to create RoundTripper for frontend %s: %v", frontendName, err)
log.Errorf("Skipping frontend %s...", frontendName)
continue frontend
}
fwd, err := forward.New(
forward.Logger(oxyLogger),
forward.PassHostHeader(frontend.PassHostHeader),
forward.RoundTripper(roundTripper),
forward.ErrorHandler(errorHandler),
)
if err != nil {
log.Errorf("Error creating forwarder for frontend %s: %v", frontendName, err)
log.Errorf("Skipping frontend %s...", frontendName)
continue frontend
}
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var rr *roundrobin.RoundRobin
var saveFrontend http.Handler
if server.accessLoggerMiddleware != nil {
saveBackend := accesslog.NewSaveBackend(fwd, frontend.Backend)
saveFrontend = accesslog.NewSaveFrontend(saveBackend, frontendName)
rr, _ = roundrobin.New(saveFrontend)
} else {
rr, _ = roundrobin.New(fwd)
}
if config.Backends[frontend.Backend] == nil {
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log.Errorf("Undefined backend '%s' for frontend %s", frontend.Backend, frontendName)
log.Errorf("Skipping frontend %s...", frontendName)
continue frontend
}
lbMethod, err := types.NewLoadBalancerMethod(config.Backends[frontend.Backend].LoadBalancer)
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if err != nil {
log.Errorf("Error loading load balancer method '%+v' for frontend %s: %v", config.Backends[frontend.Backend].LoadBalancer, frontendName, err)
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log.Errorf("Skipping frontend %s...", frontendName)
continue frontend
}
stickySession := config.Backends[frontend.Backend].LoadBalancer.Sticky
cookieName := "_TRAEFIK_BACKEND_" + frontend.Backend
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var sticky *roundrobin.StickySession
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if stickySession {
sticky = roundrobin.NewStickySession(cookieName)
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}
var lb http.Handler
switch lbMethod {
case types.Drr:
log.Debugf("Creating load-balancer drr")
rebalancer, _ := roundrobin.NewRebalancer(rr, roundrobin.RebalancerLogger(oxyLogger))
if stickySession {
log.Debugf("Sticky session with cookie %v", cookieName)
rebalancer, _ = roundrobin.NewRebalancer(rr, roundrobin.RebalancerLogger(oxyLogger), roundrobin.RebalancerStickySession(sticky))
}
lb = rebalancer
if err := configureLBServers(rebalancer, config, frontend); err != nil {
log.Errorf("Skipping frontend %s...", frontendName)
continue frontend
}
hcOpts := parseHealthCheckOptions(rebalancer, frontend.Backend, config.Backends[frontend.Backend].HealthCheck, globalConfiguration.HealthCheck)
if hcOpts != nil {
log.Debugf("Setting up backend health check %s", *hcOpts)
backendsHealthCheck[entryPointName+frontend.Backend] = healthcheck.NewBackendHealthCheck(*hcOpts)
}
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lb = middlewares.NewEmptyBackendHandler(rebalancer, lb)
case types.Wrr:
log.Debugf("Creating load-balancer wrr")
if stickySession {
log.Debugf("Sticky session with cookie %v", cookieName)
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if server.accessLoggerMiddleware != nil {
rr, _ = roundrobin.New(saveFrontend, roundrobin.EnableStickySession(sticky))
} else {
rr, _ = roundrobin.New(fwd, roundrobin.EnableStickySession(sticky))
}
}
lb = rr
if err := configureLBServers(rr, config, frontend); err != nil {
log.Errorf("Skipping frontend %s...", frontendName)
continue frontend
}
hcOpts := parseHealthCheckOptions(rr, frontend.Backend, config.Backends[frontend.Backend].HealthCheck, globalConfiguration.HealthCheck)
if hcOpts != nil {
log.Debugf("Setting up backend health check %s", *hcOpts)
backendsHealthCheck[entryPointName+frontend.Backend] = healthcheck.NewBackendHealthCheck(*hcOpts)
}
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lb = middlewares.NewEmptyBackendHandler(rr, lb)
}
if len(frontend.Errors) > 0 {
for _, errorPage := range frontend.Errors {
if config.Backends[errorPage.Backend] != nil && config.Backends[errorPage.Backend].Servers["error"].URL != "" {
errorPageHandler, err := middlewares.NewErrorPagesHandler(errorPage, config.Backends[errorPage.Backend].Servers["error"].URL)
if err != nil {
log.Errorf("Error creating custom error page middleware, %v", err)
} else {
n.Use(errorPageHandler)
}
} else {
log.Errorf("Error Page is configured for Frontend %s, but either Backend %s is not set or Backend URL is missing", frontendName, errorPage.Backend)
}
}
}
maxConns := config.Backends[frontend.Backend].MaxConn
if maxConns != nil && maxConns.Amount != 0 {
extractFunc, err := utils.NewExtractor(maxConns.ExtractorFunc)
if err != nil {
log.Errorf("Error creating connlimit: %v", err)
log.Errorf("Skipping frontend %s...", frontendName)
continue frontend
}
log.Debugf("Creating load-balancer connlimit")
lb, err = connlimit.New(lb, extractFunc, maxConns.Amount, connlimit.Logger(oxyLogger))
if err != nil {
log.Errorf("Error creating connlimit: %v", err)
log.Errorf("Skipping frontend %s...", frontendName)
continue frontend
}
}
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if globalConfiguration.Retry != nil {
countServers := len(config.Backends[frontend.Backend].Servers)
lb = server.buildRetryMiddleware(lb, globalConfiguration, countServers, frontend.Backend)
}
if server.metricsRegistry.IsEnabled() {
n.Use(middlewares.NewMetricsWrapper(server.metricsRegistry, frontend.Backend))
}
ipWhitelistMiddleware, err := configureIPWhitelistMiddleware(frontend.WhitelistSourceRange)
if err != nil {
log.Fatalf("Error creating IP Whitelister: %s", err)
} else if ipWhitelistMiddleware != nil {
n.Use(ipWhitelistMiddleware)
log.Infof("Configured IP Whitelists: %s", frontend.WhitelistSourceRange)
}
if len(frontend.BasicAuth) > 0 {
users := types.Users{}
for _, user := range frontend.BasicAuth {
users = append(users, user)
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}
auth := &types.Auth{}
auth.Basic = &types.Basic{
Users: users,
}
authMiddleware, err := middlewares.NewAuthenticator(auth)
if err != nil {
log.Errorf("Error creating Auth: %s", err)
} else {
n.Use(authMiddleware)
}
}
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if frontend.Headers.HasCustomHeadersDefined() {
headerMiddleware := middlewares.NewHeaderFromStruct(frontend.Headers)
log.Debugf("Adding header middleware for frontend %s", frontendName)
n.Use(headerMiddleware)
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}
if frontend.Headers.HasSecureHeadersDefined() {
secureMiddleware := middlewares.NewSecure(frontend.Headers)
log.Debugf("Adding secure middleware for frontend %s", frontendName)
n.UseFunc(secureMiddleware.HandlerFuncWithNext)
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}
if config.Backends[frontend.Backend].CircuitBreaker != nil {
log.Debugf("Creating circuit breaker %s", config.Backends[frontend.Backend].CircuitBreaker.Expression)
circuitBreaker, err := middlewares.NewCircuitBreaker(lb, config.Backends[frontend.Backend].CircuitBreaker.Expression, cbreaker.Logger(oxyLogger))
if err != nil {
log.Errorf("Error creating circuit breaker: %v", err)
log.Errorf("Skipping frontend %s...", frontendName)
continue frontend
}
n.Use(circuitBreaker)
} else {
n.UseHandler(lb)
}
backends[entryPointName+frontend.Backend] = n
} else {
log.Debugf("Reusing backend %s", frontend.Backend)
}
if frontend.Priority > 0 {
newServerRoute.route.Priority(frontend.Priority)
}
server.wireFrontendBackend(newServerRoute, backends[entryPointName+frontend.Backend])
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err := newServerRoute.route.GetError()
if err != nil {
log.Errorf("Error building route: %s", err)
}
}
}
}
healthcheck.GetHealthCheck().SetBackendsConfiguration(server.routinesPool.Ctx(), backendsHealthCheck)
//sort routes
for _, serverEntryPoint := range serverEntryPoints {
serverEntryPoint.httpRouter.GetHandler().SortRoutes()
}
return serverEntryPoints, nil
}
func configureLBServers(lb healthcheck.LoadBalancer, config *types.Configuration, frontend *types.Frontend) error {
for serverName, server := range config.Backends[frontend.Backend].Servers {
u, err := url.Parse(server.URL)
if err != nil {
log.Errorf("Error parsing server URL %s: %v", server.URL, err)
return err
}
log.Debugf("Creating server %s at %s with weight %d", serverName, u, server.Weight)
if err := lb.UpsertServer(u, roundrobin.Weight(server.Weight)); err != nil {
log.Errorf("Error adding server %s to load balancer: %v", server.URL, err)
return err
}
}
return nil
}
func configureIPWhitelistMiddleware(whitelistSourceRanges []string) (negroni.Handler, error) {
if len(whitelistSourceRanges) > 0 {
ipSourceRanges := whitelistSourceRanges
ipWhitelistMiddleware, err := middlewares.NewIPWhitelister(ipSourceRanges)
if err != nil {
return nil, err
}
return ipWhitelistMiddleware, nil
}
return nil, nil
}
func (server *Server) wireFrontendBackend(serverRoute *serverRoute, handler http.Handler) {
// path replace - This needs to always be the very last on the handler chain (first in the order in this function)
// -- Replacing Path should happen at the very end of the Modifier chain, after all the Matcher+Modifiers ran
if len(serverRoute.replacePath) > 0 {
handler = &middlewares.ReplacePath{
Path: serverRoute.replacePath,
Handler: handler,
}
}
// add prefix - This needs to always be right before ReplacePath on the chain (second in order in this function)
// -- Adding Path Prefix should happen after all *Strip Matcher+Modifiers ran, but before Replace (in case it's configured)
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if len(serverRoute.addPrefix) > 0 {
handler = &middlewares.AddPrefix{
Prefix: serverRoute.addPrefix,
Handler: handler,
}
}
// strip prefix
if len(serverRoute.stripPrefixes) > 0 {
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handler = &middlewares.StripPrefix{
Prefixes: serverRoute.stripPrefixes,
Handler: handler,
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}
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}
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// strip prefix with regex
if len(serverRoute.stripPrefixesRegex) > 0 {
handler = middlewares.NewStripPrefixRegex(handler, serverRoute.stripPrefixesRegex)
}
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serverRoute.route.Handler(handler)
}
func (server *Server) loadEntryPointConfig(entryPointName string, entryPoint *configuration.EntryPoint) (negroni.Handler, error) {
regex := entryPoint.Redirect.Regex
replacement := entryPoint.Redirect.Replacement
if len(entryPoint.Redirect.EntryPoint) > 0 {
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regex = `^(?:https?:\/\/)?([\w\._-]+)(?::\d+)?(.*)$`
if server.globalConfiguration.EntryPoints[entryPoint.Redirect.EntryPoint] == nil {
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return nil, errors.New("Unknown entrypoint " + entryPoint.Redirect.EntryPoint)
}
protocol := "http"
if server.globalConfiguration.EntryPoints[entryPoint.Redirect.EntryPoint].TLS != nil {
protocol = "https"
}
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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)
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return rewrite, nil
}
func (server *Server) buildDefaultHTTPRouter() *mux.Router {
router := mux.NewRouter()
router.NotFoundHandler = http.HandlerFunc(notFoundHandler)
router.StrictSlash(true)
router.SkipClean(true)
return router
}
func parseHealthCheckOptions(lb healthcheck.LoadBalancer, backend string, hc *types.HealthCheck, hcConfig *configuration.HealthCheckConfig) *healthcheck.Options {
if hc == nil || hc.Path == "" || hcConfig == nil {
return nil
}
interval := time.Duration(hcConfig.Interval)
if hc.Interval != "" {
intervalOverride, err := time.ParseDuration(hc.Interval)
switch {
case err != nil:
log.Errorf("Illegal healthcheck interval for backend '%s': %s", backend, err)
case intervalOverride <= 0:
log.Errorf("Healthcheck interval smaller than zero for backend '%s', backend", backend)
default:
interval = intervalOverride
}
}
return &healthcheck.Options{
Path: hc.Path,
Interval: interval,
LB: lb,
}
}
func getRoute(serverRoute *serverRoute, route *types.Route) error {
rules := Rules{route: serverRoute}
newRoute, err := rules.Parse(route.Rule)
if err != nil {
return err
}
newRoute.Priority(serverRoute.route.GetPriority() + len(route.Rule))
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
}
func (server *Server) configureFrontends(frontends map[string]*types.Frontend) {
for _, frontend := range frontends {
// default endpoints if not defined in frontends
if len(frontend.EntryPoints) == 0 {
frontend.EntryPoints = server.globalConfiguration.DefaultEntryPoints
}
}
}
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func (*Server) configureBackends(backends map[string]*types.Backend) {
for backendName, backend := range backends {
_, err := types.NewLoadBalancerMethod(backend.LoadBalancer)
if err != nil {
log.Debugf("Validation of load balancer method for backend %s failed: %s. Using default method wrr.", backendName, err)
var sticky bool
if backend.LoadBalancer != nil {
sticky = backend.LoadBalancer.Sticky
}
backend.LoadBalancer = &types.LoadBalancer{
Method: "wrr",
Sticky: sticky,
}
}
}
}
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func (server *Server) registerMetricClients(metricsConfig *types.Metrics) {
registries := []metrics.Registry{}
if metricsConfig.Prometheus != nil {
registries = append(registries, metrics.RegisterPrometheus(metricsConfig.Prometheus))
log.Debug("Configured Prometheus metrics")
}
if metricsConfig.Datadog != nil {
registries = append(registries, metrics.RegisterDatadog(metricsConfig.Datadog))
log.Debugf("Configured DataDog metrics pushing to %s once every %s", metricsConfig.Datadog.Address, metricsConfig.Datadog.PushInterval)
}
if metricsConfig.StatsD != nil {
registries = append(registries, metrics.RegisterStatsd(metricsConfig.StatsD))
log.Debugf("Configured StatsD metrics pushing to %s once every %s", metricsConfig.StatsD.Address, metricsConfig.StatsD.PushInterval)
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}
if len(registries) > 0 {
server.metricsRegistry = metrics.NewMultiRegistry(registries)
}
}
func stopMetricsClients() {
metrics.StopDatadog()
metrics.StopStatsd()
}
func (server *Server) buildRetryMiddleware(handler http.Handler, globalConfig configuration.GlobalConfiguration, countServers int, backendName string) http.Handler {
retryListeners := middlewares.RetryListeners{}
if server.metricsRegistry.IsEnabled() {
retryListeners = append(retryListeners, middlewares.NewMetricsRetryListener(server.metricsRegistry, backendName))
}
if server.accessLoggerMiddleware != nil {
retryListeners = append(retryListeners, &accesslog.SaveRetries{})
}
retryAttempts := countServers
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if globalConfig.Retry.Attempts > 0 {
retryAttempts = globalConfig.Retry.Attempts
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}
log.Debugf("Creating retries max attempts %d", retryAttempts)
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return middlewares.NewRetry(retryAttempts, handler, retryListeners)
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}