traefik/server.go

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/*
Copyright
*/
package main
import (
"crypto/tls"
"encoding/json"
"errors"
"net/http"
"net/url"
"os"
"os/signal"
"reflect"
"regexp"
"sort"
"strconv"
"syscall"
"time"
log "github.com/Sirupsen/logrus"
"github.com/codegangsta/negroni"
"github.com/containous/oxy/cbreaker"
"github.com/containous/oxy/connlimit"
"github.com/containous/oxy/forward"
"github.com/containous/oxy/roundrobin"
"github.com/containous/oxy/stream"
"github.com/containous/oxy/utils"
"github.com/containous/traefik/middlewares"
"github.com/containous/traefik/provider"
"github.com/containous/traefik/safe"
"github.com/containous/traefik/types"
"github.com/gorilla/mux"
"github.com/mailgun/manners"
"github.com/streamrail/concurrent-map"
)
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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
loggerMiddleware *middlewares.Logger
routinesPool safe.Pool
}
type serverEntryPoints map[string]*serverEntryPoint
type serverEntryPoint struct {
httpServer *manners.GracefulServer
httpRouter *middlewares.HandlerSwitcher
}
type serverRoute struct {
route *mux.Route
stripPrefixes []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, 10)
server.configurationValidatedChan = make(chan types.ConfigMessage, 10)
server.signals = make(chan os.Signal, 1)
server.stopChan = make(chan bool, 1)
server.providers = []provider.Provider{}
signal.Notify(server.signals, syscall.SIGINT, syscall.SIGTERM)
currentConfigurations := make(configs)
server.currentConfigurations.Set(currentConfigurations)
server.globalConfiguration = globalConfiguration
server.loggerMiddleware = middlewares.NewLogger(globalConfiguration.AccessLogsFile)
return server
}
// Start starts the server and blocks until server is shutted down.
func (server *Server) Start() {
server.startHTTPServers()
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()
<-server.stopChan
}
// Stop stops the server
func (server *Server) Stop() {
for _, serverEntryPoint := range server.serverEntryPoints {
serverEntryPoint.httpServer.BlockingClose()
}
server.stopChan <- true
}
// Close destroys the server
func (server *Server) Close() {
server.routinesPool.Stop()
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close(server.configurationChan)
close(server.configurationValidatedChan)
close(server.signals)
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close(server.stopChan)
server.loggerMiddleware.Close()
}
func (server *Server) startHTTPServers() {
server.serverEntryPoints = server.buildEntryPoints(server.globalConfiguration)
for newServerEntryPointName, newServerEntryPoint := range server.serverEntryPoints {
newsrv, err := server.prepareServer(newServerEntryPointName, newServerEntryPoint.httpRouter, server.globalConfiguration.EntryPoints[newServerEntryPointName], nil, server.loggerMiddleware, metrics)
if err != nil {
log.Fatal("Error preparing server: ", err)
}
serverEntryPoint := server.serverEntryPoints[newServerEntryPointName]
serverEntryPoint.httpServer = newsrv
go server.startServer(serverEntryPoint.httpServer, server.globalConfiguration)
}
}
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
}
jsonConf, _ := json.Marshal(configMsg.Configuration)
log.Debugf("Configuration received from provider %s: %s", configMsg.ProviderName, string(jsonConf))
lastConfigs.Set(configMsg.ProviderName, &configMsg)
lastReceivedConfigurationValue := lastReceivedConfiguration.Get().(time.Time)
if time.Now().After(lastReceivedConfigurationValue.Add(time.Duration(server.globalConfiguration.ProvidersThrottleDuration))) {
log.Debugf("Last %s config received more than %s, OK", configMsg.ProviderName, server.globalConfiguration.ProvidersThrottleDuration)
// 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)
server.routinesPool.Go(func(stop chan bool) {
select {
case <-stop:
return
case <-time.After(server.globalConfiguration.ProvidersThrottleDuration):
lastReceivedConfigurationValue := lastReceivedConfiguration.Get().(time.Time)
if time.Now().After(lastReceivedConfigurationValue.Add(time.Duration(server.globalConfiguration.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) listenConfigurations(stop chan bool) {
for {
select {
case <-stop:
return
case configMsg, ok := <-server.configurationValidatedChan:
if !ok {
return
}
currentConfigurations := server.currentConfigurations.Get().(configs)
if configMsg.Configuration == nil {
log.Info("Skipping empty Configuration")
} else if reflect.DeepEqual(currentConfigurations[configMsg.ProviderName], configMsg.Configuration) {
log.Info("Skipping same configuration")
} else {
// 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)
} else {
log.Error("Error loading new configuration, aborted ", err)
}
}
}
}
}
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)
}
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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)
}
}
func (server *Server) startProviders() {
// start providers
for _, provider := range server.providers {
jsonConf, _ := json.Marshal(provider)
log.Infof("Starting provider %v %s", reflect.TypeOf(provider), jsonConf)
currentProvider := provider
safe.Go(func() {
err := currentProvider.Provide(server.configurationChan, &server.routinesPool)
if err != nil {
log.Errorf("Error starting provider %s", err)
}
})
}
}
func (server *Server) listenSignals() {
sig := <-server.signals
log.Infof("I have to go... %+v", sig)
log.Info("Stopping server")
server.Stop()
}
// 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 := &tls.Config{}
config.Certificates = []tls.Certificate{}
for _, v := range tlsOption.Certificates {
cert, err := tls.LoadX509KeyPair(v.CertFile, v.KeyFile)
if err != nil {
return nil, err
}
config.Certificates = append(config.Certificates, cert)
}
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 {
if router.GetHandler().Match(&http.Request{URL: &url.URL{}, Host: domain}, &mux.RouteMatch{}) {
return true
}
return false
}
err := server.globalConfiguration.ACME.CreateConfig(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()
return config, nil
}
func (server *Server) startServer(srv *manners.GracefulServer, globalConfiguration GlobalConfiguration) {
log.Infof("Starting server on %s", srv.Addr)
if srv.TLSConfig != nil {
if err := srv.ListenAndServeTLSWithConfig(srv.TLSConfig); err != nil {
log.Fatal("Error creating server: ", err)
}
} else {
if err := srv.ListenAndServe(); err != nil {
log.Fatal("Error creating server: ", err)
}
}
log.Info("Server stopped")
}
func (server *Server) prepareServer(entryPointName string, router *middlewares.HandlerSwitcher, entryPoint *EntryPoint, oldServer *manners.GracefulServer, middlewares ...negroni.Handler) (*manners.GracefulServer, 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.Fatalf("Error creating TLS config %s", err)
return nil, err
}
if oldServer == nil {
return manners.NewWithServer(
&http.Server{
Addr: entryPoint.Address,
Handler: negroni,
TLSConfig: tlsConfig,
}), nil
}
gracefulServer, err := oldServer.HijackListener(&http.Server{
Addr: entryPoint.Address,
Handler: negroni,
TLSConfig: tlsConfig,
}, tlsConfig)
if err != nil {
log.Fatalf("Error hijacking server %s", err)
return nil, err
}
return gracefulServer, 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
}
// 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]http.Handler)
backends := map[string]http.Handler{}
for _, configuration := range configurations {
frontendNames := sortedFrontendNamesForConfig(configuration)
for _, frontendName := range frontendNames {
frontend := configuration.Frontends[frontendName]
log.Debugf("Creating frontend %s", frontendName)
fwd, _ := forward.New(forward.Logger(oxyLogger), forward.PassHostHeader(frontend.PassHostHeader))
// default endpoints if not defined in frontends
if len(frontend.EntryPoints) == 0 {
frontend.EntryPoints = globalConfiguration.DefaultEntryPoints
}
if len(frontend.EntryPoints) == 0 {
log.Errorf("No entrypoint defined for frontend %s, defaultEntryPoints:%s. Skipping it", frontendName, globalConfiguration.DefaultEntryPoints)
continue
}
for _, entryPointName := range frontend.EntryPoints {
log.Debugf("Wiring frontend %s to entryPoint %s", frontendName, entryPointName)
if _, ok := serverEntryPoints[entryPointName]; !ok {
return nil, errors.New("Undefined entrypoint: " + entryPointName)
}
newServerRoute := &serverRoute{route: serverEntryPoints[entryPointName].httpRouter.GetHandler().NewRoute().Name(frontendName)}
for routeName, route := range frontend.Routes {
err := getRoute(newServerRoute, &route)
if err != nil {
return nil, err
}
log.Debugf("Creating route %s %s", routeName, route.Rule)
}
entryPoint := globalConfiguration.EntryPoints[entryPointName]
if entryPoint.Redirect != nil {
if redirectHandlers[entryPointName] != nil {
newServerRoute.route.Handler(redirectHandlers[entryPointName])
} else if handler, err := server.loadEntryPointConfig(entryPointName, entryPoint); err != nil {
return nil, err
} else {
newServerRoute.route.Handler(handler)
redirectHandlers[entryPointName] = handler
}
} else {
if backends[frontend.Backend] == nil {
log.Debugf("Creating backend %s", frontend.Backend)
var lb http.Handler
rr, _ := roundrobin.New(fwd)
if configuration.Backends[frontend.Backend] == nil {
return nil, errors.New("Undefined backend: " + frontend.Backend)
}
lbMethod, err := types.NewLoadBalancerMethod(configuration.Backends[frontend.Backend].LoadBalancer)
if err != nil {
configuration.Backends[frontend.Backend].LoadBalancer = &types.LoadBalancer{Method: "wrr"}
}
switch lbMethod {
case types.Drr:
log.Debugf("Creating load-balancer drr")
rebalancer, _ := roundrobin.NewRebalancer(rr, roundrobin.RebalancerLogger(oxyLogger))
lb = rebalancer
for serverName, server := range configuration.Backends[frontend.Backend].Servers {
url, err := url.Parse(server.URL)
if err != nil {
return nil, err
}
log.Debugf("Creating server %s at %s with weight %d", serverName, url.String(), server.Weight)
if err := rebalancer.UpsertServer(url, roundrobin.Weight(server.Weight)); err != nil {
return nil, err
}
}
case types.Wrr:
log.Debugf("Creating load-balancer wrr")
lb = rr
for serverName, server := range configuration.Backends[frontend.Backend].Servers {
url, err := url.Parse(server.URL)
if err != nil {
return nil, err
}
log.Debugf("Creating server %s at %s with weight %d", serverName, url.String(), server.Weight)
if err := rr.UpsertServer(url, roundrobin.Weight(server.Weight)); err != nil {
return nil, err
}
}
}
maxConns := configuration.Backends[frontend.Backend].MaxConn
if maxConns != nil && maxConns.Amount != 0 {
extractFunc, err := utils.NewExtractor(maxConns.ExtractorFunc)
if err != nil {
return nil, err
}
log.Debugf("Creating loadd-balancer connlimit")
lb, err = connlimit.New(lb, extractFunc, maxConns.Amount, connlimit.Logger(oxyLogger))
if err != nil {
return nil, err
}
}
// retry ?
if globalConfiguration.Retry != nil {
retries := len(configuration.Backends[frontend.Backend].Servers)
if globalConfiguration.Retry.Attempts > 0 {
retries = globalConfiguration.Retry.Attempts
}
maxMem := int64(2 * 1024 * 1024)
if globalConfiguration.Retry.MaxMem > 0 {
maxMem = globalConfiguration.Retry.MaxMem
}
lb, err = stream.New(lb,
stream.Logger(oxyLogger),
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)
}
}
}
}
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 {
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regex = "^(?:https?:\\/\\/)?([\\da-z\\.-]+)(?::\\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"
}
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
}