traefik/server.go

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/*
Copyright
*/
package main
import (
"crypto/tls"
"encoding/json"
"errors"
log "github.com/Sirupsen/logrus"
"github.com/codegangsta/negroni"
"github.com/containous/traefik/middlewares"
"github.com/containous/traefik/provider"
"github.com/containous/traefik/types"
"github.com/gorilla/mux"
"github.com/mailgun/manners"
"github.com/mailgun/oxy/cbreaker"
"github.com/mailgun/oxy/forward"
"github.com/mailgun/oxy/roundrobin"
"net/http"
"net/url"
"os"
"os/signal"
"reflect"
"regexp"
"sort"
"sync"
"syscall"
"time"
)
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var oxyLogger = &OxyLogger{}
// Server is the reverse-proxy/load-balancer engine
type Server struct {
serverEntryPoints map[string]serverEntryPoint
configurationChan chan types.ConfigMessage
configurationValidatedChan chan types.ConfigMessage
signals chan os.Signal
stopChan chan bool
providers []provider.Provider
serverLock sync.Mutex
currentConfigurations configs
globalConfiguration GlobalConfiguration
loggerMiddleware *middlewares.Logger
}
type serverEntryPoint struct {
httpServer *manners.GracefulServer
httpRouter *mux.Router
}
// 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)
server.providers = []provider.Provider{}
signal.Notify(server.signals, syscall.SIGINT, syscall.SIGTERM)
server.currentConfigurations = make(configs)
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() {
go server.listenProviders()
go server.listenConfigurations()
server.configureProviders()
server.startProviders()
go server.listenSignals()
<-server.stopChan
}
// Stop stops the server
func (server *Server) Stop() {
for _, serverEntryPoint := range server.serverEntryPoints {
serverEntryPoint.httpServer.Close()
}
server.stopChan <- true
}
// Close destroys the server
func (server *Server) Close() {
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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) listenProviders() {
lastReceivedConfiguration := time.Unix(0, 0)
lastConfigs := make(map[string]*types.ConfigMessage)
for {
configMsg := <-server.configurationChan
jsonConf, _ := json.Marshal(configMsg.Configuration)
log.Debugf("Configuration receveived from provider %s: %s", configMsg.ProviderName, string(jsonConf))
lastConfigs[configMsg.ProviderName] = &configMsg
if time.Now().After(lastReceivedConfiguration.Add(time.Duration(server.globalConfiguration.ProvidersThrottleDuration))) {
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log.Debugf("Last %s config received more than %s, OK", configMsg.ProviderName, server.globalConfiguration.ProvidersThrottleDuration)
// 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)
go func() {
<-time.After(server.globalConfiguration.ProvidersThrottleDuration)
if time.Now().After(lastReceivedConfiguration.Add(time.Duration(server.globalConfiguration.ProvidersThrottleDuration))) {
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log.Debugf("Waited for %s config, OK", configMsg.ProviderName)
server.configurationValidatedChan <- *lastConfigs[configMsg.ProviderName]
}
}()
}
lastReceivedConfiguration = time.Now()
}
}
func (server *Server) listenConfigurations() {
for {
configMsg := <-server.configurationValidatedChan
if configMsg.Configuration == nil {
log.Info("Skipping empty Configuration")
} else if reflect.DeepEqual(server.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 server.currentConfigurations {
newConfigurations[k] = v
}
newConfigurations[configMsg.ProviderName] = configMsg.Configuration
newServerEntryPoints, err := server.loadConfig(newConfigurations, server.globalConfiguration)
if err == nil {
server.serverLock.Lock()
for newServerEntryPointName, newServerEntryPoint := range newServerEntryPoints {
currentServerEntryPoint := server.serverEntryPoints[newServerEntryPointName]
server.currentConfigurations = newConfigurations
currentServerEntryPoint.httpRouter = newServerEntryPoint.httpRouter
oldServer := currentServerEntryPoint.httpServer
newsrv, err := server.prepareServer(currentServerEntryPoint.httpRouter, server.globalConfiguration.EntryPoints[newServerEntryPointName], oldServer, server.loggerMiddleware, metrics)
if err != nil {
log.Fatal("Error preparing server: ", err)
}
go server.startServer(newsrv, server.globalConfiguration)
currentServerEntryPoint.httpServer = newsrv
server.serverEntryPoints[newServerEntryPointName] = currentServerEntryPoint
time.Sleep(1 * time.Second)
if oldServer != nil {
log.Info("Stopping old server")
oldServer.Close()
}
}
server.serverLock.Unlock()
} 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
go func() {
err := currentProvider.Provide(server.configurationChan)
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(tlsOption *TLS) (*tls.Config, error) {
if tlsOption == nil {
return nil, nil
}
if len(tlsOption.Certificates) == 0 {
return nil, nil
}
config := &tls.Config{}
if config.NextProtos == nil {
config.NextProtos = []string{"http/1.1"}
}
var err error
config.Certificates = make([]tls.Certificate, len(tlsOption.Certificates))
for i, v := range tlsOption.Certificates {
config.Certificates[i], err = tls.LoadX509KeyPair(v.CertFile, v.KeyFile)
if err != nil {
return nil, err
}
}
// 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.Info("Starting server on ", srv.Addr)
if srv.TLSConfig != nil {
err := srv.ListenAndServeTLSWithConfig(srv.TLSConfig)
if err != nil {
log.Fatal("Error creating server: ", err)
}
} else {
err := srv.ListenAndServe()
if err != nil {
log.Fatal("Error creating server: ", err)
}
}
log.Info("Server stopped")
}
func (server *Server) prepareServer(router *mux.Router, entryPoint *EntryPoint, oldServer *manners.GracefulServer, middlewares ...negroni.Handler) (*manners.GracefulServer, error) {
log.Info("Preparing server")
// middlewares
var negroni = negroni.New()
for _, middleware := range middlewares {
negroni.Use(middleware)
}
negroni.UseHandler(router)
tlsConfig, err := server.createTLSConfig(entryPoint.TLS)
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: 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
}
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)
}
newRoute := serverEntryPoints[entryPointName].httpRouter.NewRoute().Name(frontendName)
for routeName, route := range frontend.Routes {
log.Debugf("Creating route %s %s:%s", routeName, route.Rule, route.Value)
newRouteReflect, err := invoke(newRoute, route.Rule, route.Value)
if err != nil {
return nil, err
}
newRoute = newRouteReflect[0].Interface().(*mux.Route)
}
entryPoint := globalConfiguration.EntryPoints[entryPointName]
if entryPoint.Redirect != nil {
if redirectHandlers[entryPointName] != nil {
newRoute.Handler(redirectHandlers[entryPointName])
} else if handler, err := server.loadEntryPointConfig(entryPointName, entryPoint); err != nil {
return nil, err
} else {
newRoute.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)
rebalancer.UpsertServer(url, roundrobin.Weight(server.Weight))
}
case types.Wrr:
log.Debugf("Creating load-balancer wrr")
lb = middlewares.NewWebsocketUpgrader(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)
rr.UpsertServer(url, roundrobin.Weight(server.Weight))
}
}
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)
}
newRoute.Handler(backends[frontend.Backend])
}
err := newRoute.GetError()
if err != nil {
log.Errorf("Error building route: %s", err)
}
}
}
}
return serverEntryPoints, nil
}
func (server *Server) loadEntryPointConfig(entryPointName string, entryPoint *EntryPoint) (http.Handler, error) {
regex := entryPoint.Redirect.Regex
replacement := entryPoint.Redirect.Replacement
if len(entryPoint.Redirect.EntryPoint) > 0 {
regex = "^(?:https?:\\/\\/)?([\\da-z\\.-]+)(?::\\d+)(.*)$"
if server.globalConfiguration.EntryPoints[entryPoint.Redirect.EntryPoint] == nil {
return nil, errors.New("Unkown 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)
return router
}
func sortedFrontendNamesForConfig(configuration *types.Configuration) []string {
keys := []string{}
for key := range configuration.Frontends {
keys = append(keys, key)
}
sort.Strings(keys)
return keys
}