traefik/traefik.go
2015-09-12 19:22:44 +02:00

231 lines
6.9 KiB
Go

package main
import (
"github.com/BurntSushi/toml"
"github.com/codegangsta/negroni"
"github.com/gorilla/mux"
"github.com/mailgun/oxy/forward"
"github.com/mailgun/oxy/roundrobin"
"github.com/op/go-logging"
"github.com/thoas/stats"
"github.com/tylerb/graceful"
"github.com/unrolled/render"
"gopkg.in/alecthomas/kingpin.v2"
"./middlewares"
"net/http"
"net/url"
"os"
"os/signal"
"reflect"
"syscall"
"time"
)
var (
globalConfigFile = kingpin.Arg("conf", "Main configration file.").Default("traefik.toml").String()
currentConfiguration = new(Configuration)
metrics = stats.New()
log = logging.MustGetLogger("traefik")
templatesRenderer = render.New(render.Options{
Directory: "templates",
Asset: Asset,
AssetNames: AssetNames,
})
)
func main() {
kingpin.Parse()
var srv *graceful.Server
var configurationRouter *mux.Router
var configurationChan = make(chan *Configuration)
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
gloablConfiguration := LoadFileConfig(*globalConfigFile)
loggerMiddleware := middlewares.NewLogger(gloablConfiguration.AccessLogsFile)
defer loggerMiddleware.Close()
// logging
backends := []logging.Backend{}
level, err := logging.LogLevel(gloablConfiguration.LogLevel)
if err != nil {
log.Fatal("Error getting level", err)
}
if len(gloablConfiguration.TraefikLogsFile) > 0 {
fi, err := os.OpenFile(gloablConfiguration.TraefikLogsFile, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
defer fi.Close()
if err != nil {
log.Fatal("Error opening file", err)
} else {
logBackend := logging.NewLogBackend(fi, "", 0)
logBackendFormatter := logging.NewBackendFormatter(logBackend, logging.GlogFormatter)
logBackendLeveled := logging.AddModuleLevel(logBackend)
logBackendLeveled.SetLevel(level, "")
backends = append(backends, logBackendFormatter)
}
}
if gloablConfiguration.TraefikLogsStdout {
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")
} else if reflect.DeepEqual(currentConfiguration, configuration) {
log.Info("Skipping same configuration")
} else {
currentConfiguration = configuration
configurationRouter = LoadConfig(configuration, gloablConfiguration)
srv.Stop(time.Duration(gloablConfiguration.GraceTimeOut) * time.Second)
time.Sleep(3 * time.Second)
}
}
}()
// configure providers
if gloablConfiguration.Docker != nil {
providers = append(providers, gloablConfiguration.Docker)
}
if gloablConfiguration.Marathon != nil {
providers = append(providers, gloablConfiguration.Marathon)
}
if gloablConfiguration.File != nil {
if len(gloablConfiguration.File.Filename) == 0 {
// no filename, setting to global config file
gloablConfiguration.File.Filename = *globalConfigFile
}
providers = append(providers, gloablConfiguration.File)
}
if gloablConfiguration.Web != nil {
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
}
// middlewares
var negroni = negroni.New()
negroni.Use(metrics)
negroni.Use(loggerMiddleware)
//negroni.Use(middlewares.NewRoutes(configurationRouter))
negroni.UseHandler(configurationRouter)
srv = &graceful.Server{
Timeout: time.Duration(gloablConfiguration.GraceTimeOut) * time.Second,
NoSignalHandling: true,
Server: &http.Server{
Addr: gloablConfiguration.Port,
Handler: negroni,
},
}
go func() {
if len(gloablConfiguration.CertFile) > 0 && len(gloablConfiguration.KeyFile) > 0 {
srv.ListenAndServeTLS(gloablConfiguration.CertFile, gloablConfiguration.KeyFile)
} else {
srv.ListenAndServe()
}
}()
log.Notice("Started")
<-srv.StopChan()
log.Notice("Stopped")
}
}
func notFoundHandler(w http.ResponseWriter, r *http.Request) {
templatesRenderer.HTML(w, http.StatusNotFound, "notFound", nil)
}
func LoadDefaultConfig(gloablConfiguration *GlobalConfiguration) *mux.Router {
router := mux.NewRouter()
router.NotFoundHandler = http.HandlerFunc(notFoundHandler)
return router
}
func LoadConfig(configuration *Configuration, gloablConfiguration *GlobalConfiguration) *mux.Router {
router := mux.NewRouter()
router.NotFoundHandler = http.HandlerFunc(notFoundHandler)
backends := map[string]http.Handler{}
for routeName, route := range configuration.Routes {
log.Debug("Creating route %s", routeName)
fwd, _ := forward.New()
newRoute := router.NewRoute()
for ruleName, rule := range route.Rules {
log.Debug("Creating rule %s", ruleName)
newRouteReflect := Invoke(newRoute, rule.Category, rule.Value)
newRoute = newRouteReflect[0].Interface().(*mux.Route)
}
if backends[route.Backend] == nil {
log.Debug("Creating backend %s", route.Backend)
lb, _ := roundrobin.New(fwd)
rb, _ := roundrobin.NewRebalancer(lb)
for serverName, server := range configuration.Backends[route.Backend].Servers {
log.Debug("Creating server %s", serverName)
url, _ := url.Parse(server.Url)
rb.UpsertServer(url, roundrobin.Weight(server.Weight))
}
backends[route.Backend] = lb
} else {
log.Debug("Reusing backend %s", route.Backend)
}
newRoute.Handler(backends[route.Backend])
err := newRoute.GetError()
if err != nil {
log.Error("Error building route ", err)
}
}
return router
}
func Invoke(any interface{}, name string, args ...interface{}) []reflect.Value {
inputs := make([]reflect.Value, len(args))
for i, _ := range args {
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 {
log.Fatal("Error reading file ", err)
}
log.Debug("Global configuration loaded %+v", configuration)
return configuration
}