traefik/traefik.go

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Go
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package main
import (
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"github.com/BurntSushi/toml"
"github.com/codegangsta/negroni"
"github.com/emilevauge/traefik/middlewares"
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"github.com/gorilla/mux"
"github.com/mailgun/oxy/forward"
"github.com/mailgun/oxy/roundrobin"
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"github.com/op/go-logging"
"github.com/thoas/stats"
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"github.com/tylerb/graceful"
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"github.com/unrolled/render"
"gopkg.in/alecthomas/kingpin.v2"
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"net/http"
"net/url"
"os"
"os/signal"
"reflect"
"syscall"
"time"
)
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var (
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globalConfigFile = kingpin.Arg("conf", "Main configration file.").Default("traefik.toml").String()
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currentConfiguration = new(Configuration)
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metrics = stats.New()
log = logging.MustGetLogger("traefik")
templatesRenderer = render.New(render.Options{
Directory: "templates",
Asset: Asset,
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AssetNames: AssetNames,
})
)
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func main() {
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kingpin.Parse()
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var srv *graceful.Server
var configurationRouter *mux.Router
var configurationChan = make(chan *Configuration)
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defer close(configurationChan)
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var providers = []Provider{}
var format = logging.MustStringFormatter("%{color}%{time:15:04:05.000} %{shortfile:20.20s} %{level:8.8s} %{id:03x} ▶%{color:reset} %{message}")
var sigs = make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
// load global configuration
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gloablConfiguration := LoadFileConfig(*globalConfigFile)
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loggerMiddleware := middlewares.NewLogger(gloablConfiguration.AccessLogsFile)
defer loggerMiddleware.Close()
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// logging
backends := []logging.Backend{}
level, err := logging.LogLevel(gloablConfiguration.LogLevel)
if err != nil {
log.Fatal("Error getting level", err)
}
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if len(gloablConfiguration.TraefikLogsFile) > 0 {
fi, err := os.OpenFile(gloablConfiguration.TraefikLogsFile, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
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defer fi.Close()
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if err != nil {
log.Fatal("Error opening file", err)
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} else {
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logBackend := logging.NewLogBackend(fi, "", 0)
logBackendFormatter := logging.NewBackendFormatter(logBackend, logging.GlogFormatter)
logBackendLeveled := logging.AddModuleLevel(logBackend)
logBackendLeveled.SetLevel(level, "")
backends = append(backends, logBackendFormatter)
}
}
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if gloablConfiguration.TraefikLogsStdout {
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logBackend := logging.NewLogBackend(os.Stdout, "", 0)
logBackendFormatter := logging.NewBackendFormatter(logBackend, format)
logBackendLeveled := logging.AddModuleLevel(logBackend)
logBackendLeveled.SetLevel(level, "")
backends = append(backends, logBackendFormatter)
}
logging.SetBackend(backends...)
configurationRouter = LoadDefaultConfig(gloablConfiguration)
// listen new configurations from providers
go func() {
for {
configuration := <-configurationChan
log.Info("Configuration receveived %+v", configuration)
if configuration == nil {
log.Info("Skipping empty configuration")
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} else if reflect.DeepEqual(currentConfiguration, configuration) {
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log.Info("Skipping same configuration")
} else {
currentConfiguration = configuration
configurationRouter = LoadConfig(configuration, gloablConfiguration)
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srv.Stop(time.Duration(gloablConfiguration.GraceTimeOut) * time.Second)
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time.Sleep(3 * time.Second)
}
}
}()
// configure providers
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if gloablConfiguration.Docker != nil {
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providers = append(providers, gloablConfiguration.Docker)
}
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if gloablConfiguration.Marathon != nil {
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providers = append(providers, gloablConfiguration.Marathon)
}
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if gloablConfiguration.File != nil {
if len(gloablConfiguration.File.Filename) == 0 {
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// no filename, setting to global config file
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gloablConfiguration.File.Filename = *globalConfigFile
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}
providers = append(providers, gloablConfiguration.File)
}
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if gloablConfiguration.Web != nil {
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providers = append(providers, gloablConfiguration.Web)
}
// start providers
for _, provider := range providers {
log.Notice("Starting provider %v %+v", reflect.TypeOf(provider), provider)
currentProvider := provider
go func() {
currentProvider.Provide(configurationChan)
}()
}
goAway := false
go func() {
sig := <-sigs
log.Notice("I have to go... %+v", sig)
goAway = true
srv.Stop(time.Duration(gloablConfiguration.GraceTimeOut) * time.Second)
}()
for {
if goAway {
break
}
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// middlewares
var negroni = negroni.New()
negroni.Use(metrics)
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negroni.Use(loggerMiddleware)
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//negroni.Use(middlewares.NewRoutes(configurationRouter))
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negroni.UseHandler(configurationRouter)
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srv = &graceful.Server{
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Timeout: time.Duration(gloablConfiguration.GraceTimeOut) * time.Second,
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NoSignalHandling: true,
Server: &http.Server{
Addr: gloablConfiguration.Port,
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Handler: negroni,
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},
}
go func() {
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if len(gloablConfiguration.CertFile) > 0 && len(gloablConfiguration.KeyFile) > 0 {
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srv.ListenAndServeTLS(gloablConfiguration.CertFile, gloablConfiguration.KeyFile)
} else {
srv.ListenAndServe()
}
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}()
log.Notice("Started")
<-srv.StopChan()
log.Notice("Stopped")
}
}
func notFoundHandler(w http.ResponseWriter, r *http.Request) {
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http.NotFound(w, r)
//templatesRenderer.HTML(w, http.StatusNotFound, "notFound", nil)
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}
func LoadDefaultConfig(gloablConfiguration *GlobalConfiguration) *mux.Router {
router := mux.NewRouter()
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router.NotFoundHandler = http.HandlerFunc(notFoundHandler)
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return router
}
func LoadConfig(configuration *Configuration, gloablConfiguration *GlobalConfiguration) *mux.Router {
router := mux.NewRouter()
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router.NotFoundHandler = http.HandlerFunc(notFoundHandler)
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backends := map[string]http.Handler{}
for frontendName, frontend := range configuration.Frontends {
log.Debug("Creating frontend %s", frontendName)
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fwd, _ := forward.New()
newRoute := router.NewRoute()
for routeName, route := range frontend.Routes {
log.Debug("Creating route %s", routeName)
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newRouteReflect := Invoke(newRoute, route.Rule, route.Value)
newRoute = newRouteReflect[0].Interface().(*mux.Route)
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}
if backends[frontend.Backend] == nil {
log.Debug("Creating backend %s", frontend.Backend)
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lb, _ := roundrobin.New(fwd)
rb, _ := roundrobin.NewRebalancer(lb)
for serverName, server := range configuration.Backends[frontend.Backend].Servers {
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log.Debug("Creating server %s", serverName)
url, _ := url.Parse(server.Url)
rb.UpsertServer(url, roundrobin.Weight(server.Weight))
}
backends[frontend.Backend] = lb
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} else {
log.Debug("Reusing backend %s", frontend.Backend)
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}
newRoute.Handler(backends[frontend.Backend])
err := newRoute.GetError()
if err != nil {
log.Error("Error building route ", err)
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}
}
return router
}
func Invoke(any interface{}, name string, args ...interface{}) []reflect.Value {
inputs := make([]reflect.Value, len(args))
for i := range args {
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inputs[i] = reflect.ValueOf(args[i])
}
return reflect.ValueOf(any).MethodByName(name).Call(inputs)
}
func LoadFileConfig(file string) *GlobalConfiguration {
configuration := NewGlobalConfiguration()
if _, err := toml.DecodeFile(file, configuration); err != nil {
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log.Fatal("Error reading file ", err)
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}
log.Debug("Global configuration loaded %+v", configuration)
return configuration
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}