traefik/server/server.go
Ludovic Fernandez 759c269dee Code cleaning.
2017-08-18 02:18:02 +02:00

1119 lines
40 KiB
Go

package server
import (
"context"
"crypto/tls"
"crypto/x509"
"encoding/json"
"errors"
"io/ioutil"
"net/http"
"net/url"
"os"
"os/signal"
"reflect"
"regexp"
"sort"
"sync"
"time"
"github.com/containous/mux"
"github.com/containous/traefik/cluster"
"github.com/containous/traefik/healthcheck"
"github.com/containous/traefik/log"
"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"
"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"
)
var oxyLogger = &OxyLogger{}
// 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 GlobalConfiguration
accessLoggerMiddleware *accesslog.LogHandler
routinesPool *safe.Pool
leadership *cluster.Leadership
}
type serverEntryPoints map[string]*serverEntryPoint
type serverEntryPoint struct {
httpServer *http.Server
httpRouter *middlewares.HandlerSwitcher
}
type serverRoute struct {
route *mux.Route
stripPrefixes []string
stripPrefixesRegex []string
addPrefix string
replacePath string
}
// NewServer returns an initialized Server.
func NewServer(globalConfiguration 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(configs)
server.currentConfigurations.Set(currentConfigurations)
server.globalConfiguration = globalConfiguration
server.routinesPool = safe.NewPool(context.Background())
if globalConfiguration.Cluster != nil {
// leadership creation if cluster mode
server.leadership = cluster.NewLeadership(server.routinesPool.Ctx(), globalConfiguration.Cluster)
}
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)
}
}
return server
}
// 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.globalConfiguration)
server.stopLeadership()
server.routinesPool.Cleanup()
close(server.configurationChan)
close(server.configurationValidatedChan)
signal.Stop(server.signals)
close(server.signals)
close(server.stopChan)
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)
for newServerEntryPointName, newServerEntryPoint := range server.serverEntryPoints {
serverEntryPoint := server.setupServerEntryPoint(newServerEntryPointName, newServerEntryPoint)
go server.startServer(serverEntryPoint.httpServer, server.globalConfiguration)
}
}
func (server *Server) setupServerEntryPoint(newServerEntryPointName string, newServerEntryPoint *serverEntryPoint) *serverEntryPoint {
serverMiddlewares := []negroni.Handler{middlewares.NegroniRecoverHandler(), metrics}
if server.accessLoggerMiddleware != nil {
serverMiddlewares = append(serverMiddlewares, server.accessLoggerMiddleware)
}
initializeMetricsClients(server.globalConfiguration)
metrics := newMetrics(server.globalConfiguration, newServerEntryPointName)
if metrics != nil {
serverMiddlewares = append(serverMiddlewares, middlewares.NewMetricsWrapper(metrics))
}
if server.globalConfiguration.Web != nil && server.globalConfiguration.Web.Statistics != nil {
statsRecorder = middlewares.NewStatsRecorder(server.globalConfiguration.Web.Statistics.RecentErrors)
serverMiddlewares = append(serverMiddlewares, 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)
}
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)
}
newsrv, err := server.prepareServer(newServerEntryPointName, newServerEntryPoint.httpRouter, server.globalConfiguration.EntryPoints[newServerEntryPointName], serverMiddlewares...)
if err != nil {
log.Fatal("Error preparing server: ", err)
}
serverEntryPoint := server.serverEntryPoints[newServerEntryPointName]
serverEntryPoint.httpServer = newsrv
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().(configs)
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)) {
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 {
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)
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().(configs)
// Copy configurations to new map so we don't change current if LoadConfig fails
newConfigurations := make(configs)
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().(configs)
for _, configuration := range currentConfigurations {
for _, frontend := range configuration.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.server = server
server.providers = append(server.providers, server.globalConfiguration.Web)
}
if server.globalConfiguration.Consul != nil {
server.providers = append(server.providers, server.globalConfiguration.Consul)
}
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)
}
if server.globalConfiguration.Eureka != nil {
server.providers = append(server.providers, server.globalConfiguration.Eureka)
}
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 _, provider := range server.providers {
providerType := reflect.TypeOf(provider)
jsonConf, _ := json.Marshal(provider)
log.Infof("Starting provider %v %s", providerType, jsonConf)
currentProvider := provider
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 *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 *TLS, router *middlewares.HandlerSwitcher) (*tls.Config, error) {
if tlsOption == nil {
return nil, nil
}
config, err := tlsOption.Certificates.CreateTLSConfig()
if err != nil {
return nil, err
}
// 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 := 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 := 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
}
func (server *Server) startServer(srv *http.Server, globalConfiguration GlobalConfiguration) {
log.Infof("Starting server on %s", srv.Addr)
var err error
if srv.TLSConfig != nil {
err = srv.ListenAndServeTLS("", "")
} else {
err = srv.ListenAndServe()
}
if err != nil {
log.Error("Error creating server: ", err)
}
}
func (server *Server) prepareServer(entryPointName string, router *middlewares.HandlerSwitcher, entryPoint *EntryPoint, middlewares ...negroni.Handler) (*http.Server, error) {
log.Infof("Preparing server %s %+v", entryPointName, entryPoint)
// middlewares
var negroni = negroni.New()
for _, middleware := range middlewares {
negroni.Use(middleware)
}
negroni.UseHandler(router)
tlsConfig, err := server.createTLSConfig(entryPointName, entryPoint.TLS, router)
if err != nil {
log.Errorf("Error creating TLS config: %s", err)
return nil, err
}
return &http.Server{
Addr: entryPoint.Address,
Handler: negroni,
TLSConfig: tlsConfig,
IdleTimeout: time.Duration(server.globalConfiguration.IdleTimeout),
}, nil
}
func (server *Server) buildEntryPoints(globalConfiguration 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
}
// clientTLSRoundTripper is used for forwarding client authentication to
// backend server
func clientTLSRoundTripper(config *tls.Config) http.RoundTripper {
if config == nil {
return http.DefaultTransport
}
return &http.Transport{
TLSClientConfig: config,
}
}
// LoadConfig returns a new gorilla.mux Route from the specified global configuration and the dynamic
// provider configurations.
func (server *Server) loadConfig(configurations configs, globalConfiguration GlobalConfiguration) (map[string]*serverEntryPoint, error) {
serverEntryPoints := server.buildEntryPoints(globalConfiguration)
redirectHandlers := make(map[string]negroni.Handler)
backends := map[string]http.Handler{}
backendsHealthcheck := map[string]*healthcheck.BackendHealthCheck{}
errorHandler := NewRecordingErrorHandler(middlewares.DefaultNetErrorRecorder{})
for _, configuration := range configurations {
frontendNames := sortedFrontendNamesForConfig(configuration)
frontend:
for _, frontendName := range frontendNames {
frontend := configuration.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]
negroni := negroni.New()
if entryPoint.Redirect != nil {
if redirectHandlers[entryPointName] != nil {
negroni.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 {
if server.accessLoggerMiddleware != nil {
saveFrontend := accesslog.NewSaveNegroniFrontend(handler, frontendName)
negroni.Use(saveFrontend)
redirectHandlers[entryPointName] = saveFrontend
} else {
negroni.Use(handler)
redirectHandlers[entryPointName] = handler
}
}
}
if backends[entryPointName+frontend.Backend] == nil {
log.Debugf("Creating backend %s", frontend.Backend)
var (
tlsConfig *tls.Config
err error
lb http.Handler
)
if frontend.PassTLSCert {
tlsConfig, err = createClientTLSConfig(entryPoint.TLS)
if err != nil {
log.Errorf("Failed to create TLS config for frontend %s: %v", frontendName, err)
continue frontend
}
}
// passing nil will use the roundtripper http.DefaultTransport
rt := clientTLSRoundTripper(tlsConfig)
fwd, err := forward.New(
forward.Logger(oxyLogger),
forward.PassHostHeader(frontend.PassHostHeader),
forward.RoundTripper(rt),
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
}
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 configuration.Backends[frontend.Backend] == nil {
log.Errorf("Undefined backend '%s' for frontend %s", frontend.Backend, frontendName)
log.Errorf("Skipping frontend %s...", frontendName)
continue frontend
}
lbMethod, err := types.NewLoadBalancerMethod(configuration.Backends[frontend.Backend].LoadBalancer)
if err != nil {
log.Errorf("Error loading load balancer method '%+v' for frontend %s: %v", configuration.Backends[frontend.Backend].LoadBalancer, frontendName, err)
log.Errorf("Skipping frontend %s...", frontendName)
continue frontend
}
stickysession := configuration.Backends[frontend.Backend].LoadBalancer.Sticky
cookiename := "_TRAEFIK_BACKEND_" + frontend.Backend
var sticky *roundrobin.StickySession
if stickysession {
sticky = roundrobin.NewStickySession(cookiename)
}
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, configuration, frontend); err != nil {
log.Errorf("Skipping frontend %s...", frontendName)
continue frontend
}
hcOpts := parseHealthCheckOptions(rebalancer, frontend.Backend, configuration.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)
}
lb = middlewares.NewEmptyBackendHandler(rebalancer, lb)
case types.Wrr:
log.Debugf("Creating load-balancer wrr")
if stickysession {
log.Debugf("Sticky session with cookie %v", cookiename)
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, configuration, frontend); err != nil {
log.Errorf("Skipping frontend %s...", frontendName)
continue frontend
}
hcOpts := parseHealthCheckOptions(rr, frontend.Backend, configuration.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)
}
lb = middlewares.NewEmptyBackendHandler(rr, lb)
}
if len(frontend.Errors) > 0 {
for _, errorPage := range frontend.Errors {
if configuration.Backends[errorPage.Backend] != nil && configuration.Backends[errorPage.Backend].Servers["error"].URL != "" {
errorPageHandler, err := middlewares.NewErrorPagesHandler(errorPage, configuration.Backends[errorPage.Backend].Servers["error"].URL)
if err != nil {
log.Errorf("Error creating custom error page middleware, %v", err)
} else {
negroni.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 := configuration.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
}
}
metrics := newMetrics(server.globalConfiguration, frontend.Backend)
if globalConfiguration.Retry != nil {
retryListener := middlewares.NewMetricsRetryListener(metrics)
lb = registerRetryMiddleware(lb, globalConfiguration, configuration, frontend.Backend, retryListener)
}
if metrics != nil {
negroni.Use(middlewares.NewMetricsWrapper(metrics))
}
ipWhitelistMiddleware, err := configureIPWhitelistMiddleware(frontend.WhitelistSourceRange)
if err != nil {
log.Fatalf("Error creating IP Whitelister: %s", err)
} else if ipWhitelistMiddleware != nil {
negroni.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)
}
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 {
negroni.Use(authMiddleware)
}
}
if frontend.Headers.HasCustomHeadersDefined() {
headerMiddleware := middlewares.NewHeaderFromStruct(frontend.Headers)
log.Debugf("Adding header middleware for frontend %s", frontendName)
negroni.Use(headerMiddleware)
}
if frontend.Headers.HasSecureHeadersDefined() {
secureMiddleware := middlewares.NewSecure(frontend.Headers)
log.Debugf("Adding secure middleware for frontend %s", frontendName)
negroni.UseFunc(secureMiddleware.HandlerFuncWithNext)
}
if configuration.Backends[frontend.Backend].CircuitBreaker != nil {
log.Debugf("Creating circuit breaker %s", configuration.Backends[frontend.Backend].CircuitBreaker.Expression)
cbreaker, err := middlewares.NewCircuitBreaker(lb, configuration.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
}
negroni.Use(cbreaker)
} else {
negroni.UseHandler(lb)
}
backends[entryPointName+frontend.Backend] = negroni
} else {
log.Debugf("Reusing backend %s", frontend.Backend)
}
if frontend.Priority > 0 {
newServerRoute.route.Priority(frontend.Priority)
}
server.wireFrontendBackend(newServerRoute, backends[entryPointName+frontend.Backend])
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)
if len(serverRoute.addPrefix) > 0 {
handler = &middlewares.AddPrefix{
Prefix: serverRoute.addPrefix,
Handler: handler,
}
}
// strip prefix
if len(serverRoute.stripPrefixes) > 0 {
handler = &middlewares.StripPrefix{
Prefixes: serverRoute.stripPrefixes,
Handler: handler,
}
}
// strip prefix with regex
if len(serverRoute.stripPrefixesRegex) > 0 {
handler = middlewares.NewStripPrefixRegex(handler, serverRoute.stripPrefixesRegex)
}
serverRoute.route.Handler(handler)
}
func (server *Server) loadEntryPointConfig(entryPointName string, entryPoint *EntryPoint) (negroni.Handler, error) {
regex := entryPoint.Redirect.Regex
replacement := entryPoint.Redirect.Replacement
if len(entryPoint.Redirect.EntryPoint) > 0 {
regex = `^(?:https?:\/\/)?([\w\._-]+)(?::\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)
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 *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
}
}
}
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,
}
}
}
}
// newMetrics instantiates the proper Metrics implementation, depending on the global configuration.
// Note that given there is no metrics instrumentation configured, it will return nil.
func newMetrics(globalConfig GlobalConfiguration, name string) middlewares.Metrics {
metricsEnabled := globalConfig.Web != nil && globalConfig.Web.Metrics != nil
if metricsEnabled {
// Create MultiMetric
metrics := []middlewares.Metrics{}
if globalConfig.Web.Metrics.Prometheus != nil {
metric, _, err := middlewares.NewPrometheus(name, globalConfig.Web.Metrics.Prometheus)
if err != nil {
log.Errorf("Error creating Prometheus metrics implementation: %s", err)
}
log.Debug("Configured Prometheus metrics")
metrics = append(metrics, metric)
}
if globalConfig.Web.Metrics.Datadog != nil {
metric := middlewares.NewDataDog(name)
log.Debugf("Configured DataDog metrics pushing to %s once every %s", globalConfig.Web.Metrics.Datadog.Address, globalConfig.Web.Metrics.Datadog.PushInterval)
metrics = append(metrics, metric)
}
if globalConfig.Web.Metrics.StatsD != nil {
metric := middlewares.NewStatsD(name)
log.Debugf("Configured StatsD metrics pushing to %s once every %s", globalConfig.Web.Metrics.StatsD.Address, globalConfig.Web.Metrics.StatsD.PushInterval)
metrics = append(metrics, metric)
}
return middlewares.NewMultiMetrics(metrics)
}
return nil
}
func initializeMetricsClients(globalConfig GlobalConfiguration) {
metricsEnabled := globalConfig.Web != nil && globalConfig.Web.Metrics != nil
if metricsEnabled {
if globalConfig.Web.Metrics.Datadog != nil {
middlewares.InitDatadogClient(globalConfig.Web.Metrics.Datadog)
}
if globalConfig.Web.Metrics.StatsD != nil {
middlewares.InitStatsdClient(globalConfig.Web.Metrics.StatsD)
}
}
}
func stopMetricsClients(globalConfig GlobalConfiguration) {
middlewares.StopDatadogClient()
middlewares.StopStatsdClient()
}
func registerRetryMiddleware(
httpHandler http.Handler,
globalConfig GlobalConfiguration,
config *types.Configuration,
backend string,
listener middlewares.RetryListener,
) http.Handler {
retries := len(config.Backends[backend].Servers)
if globalConfig.Retry.Attempts > 0 {
retries = globalConfig.Retry.Attempts
}
httpHandler = middlewares.NewRetry(retries, httpHandler, listener)
log.Debugf("Creating retries max attempts %d", retries)
return httpHandler
}