traefik/traefik.go

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package main
import (
fmtlog "log"
"net"
"net/http"
"net/url"
"os"
"os/signal"
"reflect"
"strings"
"syscall"
"time"
"errors"
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"github.com/BurntSushi/toml"
log "github.com/Sirupsen/logrus"
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"github.com/codegangsta/negroni"
"github.com/davecgh/go-spew/spew"
"github.com/emilevauge/traefik/middlewares"
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"github.com/gorilla/mux"
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"github.com/mailgun/manners"
"github.com/mailgun/oxy/cbreaker"
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"github.com/mailgun/oxy/forward"
"github.com/mailgun/oxy/roundrobin"
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"github.com/thoas/stats"
"github.com/unrolled/render"
"gopkg.in/alecthomas/kingpin.v2"
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"runtime"
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)
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var (
globalConfigFile = kingpin.Arg("conf", "Main configration file.").Default("traefik.toml").String()
currentConfigurations = make(configs)
metrics = stats.New()
oxyLogger = &OxyLogger{}
templatesRenderer = render.New(render.Options{
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Directory: "templates",
Asset: Asset,
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AssetNames: AssetNames,
})
)
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type configMessage struct {
providerName string
configuration *Configuration
}
type configs map[string]*Configuration
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func main() {
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runtime.GOMAXPROCS(runtime.NumCPU())
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kingpin.Parse()
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fmtlog.SetFlags(fmtlog.Lshortfile | fmtlog.LstdFlags)
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var srv *manners.GracefulServer
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var configurationRouter *mux.Router
var configurationChan = make(chan configMessage, 10)
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defer close(configurationChan)
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var sigs = make(chan os.Signal, 1)
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defer close(sigs)
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var stopChan = make(chan bool)
defer close(stopChan)
var providers = []Provider{}
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signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
// load global configuration
globalConfiguration := LoadFileConfig(*globalConfigFile)
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loggerMiddleware := middlewares.NewLogger(globalConfiguration.AccessLogsFile)
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defer loggerMiddleware.Close()
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// logging
level, err := log.ParseLevel(strings.ToLower(globalConfiguration.LogLevel))
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if err != nil {
log.Fatal("Error getting level", err)
}
log.SetLevel(level)
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if len(globalConfiguration.TraefikLogsFile) > 0 {
fi, err := os.OpenFile(globalConfiguration.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 {
log.SetOutput(fi)
log.SetFormatter(&log.TextFormatter{DisableColors: true, FullTimestamp: true, DisableSorting: true})
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}
} else {
log.SetFormatter(&log.TextFormatter{FullTimestamp: true, DisableSorting: true})
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}
log.Debugf("Global configuration loaded %s", spew.Sdump(globalConfiguration))
configurationRouter = LoadDefaultConfig(globalConfiguration)
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// listen new configurations from providers
go func() {
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for {
configMsg := <-configurationChan
log.Infof("Configuration receveived from provider %s: %#v", configMsg.providerName, configMsg.configuration)
log.Debugf("Configuration %s", spew.Sdump(configMsg.configuration))
if configMsg.configuration == nil {
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log.Info("Skipping empty configuration")
} else if reflect.DeepEqual(currentConfigurations[configMsg.providerName], configMsg.configuration) {
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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
newConfigurationRouter, err := LoadConfig(newConfigurations, globalConfiguration)
if err == nil {
currentConfigurations = newConfigurations
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configurationRouter = newConfigurationRouter
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oldServer := srv
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newsrv := prepareServer(configurationRouter, globalConfiguration, oldServer, loggerMiddleware, metrics)
go startServer(newsrv, globalConfiguration)
srv = newsrv
time.Sleep(2 * time.Second)
if oldServer != nil {
log.Info("Stopping old server")
oldServer.Close()
}
} else {
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log.Error("Error loading new configuration, aborted ", err)
}
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}
}
}()
// configure providers
if globalConfiguration.Docker != nil {
providers = append(providers, globalConfiguration.Docker)
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}
if globalConfiguration.Marathon != nil {
providers = append(providers, globalConfiguration.Marathon)
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}
if globalConfiguration.File != nil {
if len(globalConfiguration.File.Filename) == 0 {
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// no filename, setting to global config file
globalConfiguration.File.Filename = *globalConfigFile
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}
providers = append(providers, globalConfiguration.File)
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}
if globalConfiguration.Web != nil {
providers = append(providers, globalConfiguration.Web)
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}
if globalConfiguration.Consul != nil {
providers = append(providers, globalConfiguration.Consul)
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}
if globalConfiguration.Etcd != nil {
providers = append(providers, globalConfiguration.Etcd)
}
if globalConfiguration.Zookeeper != nil {
providers = append(providers, globalConfiguration.Zookeeper)
}
if globalConfiguration.Boltdb != nil {
providers = append(providers, globalConfiguration.Boltdb)
}
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// start providers
for _, provider := range providers {
log.Infof("Starting provider %v %+v", reflect.TypeOf(provider), provider)
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currentProvider := provider
go func() {
err := currentProvider.Provide(configurationChan)
if err != nil {
log.Errorf("Error starting provider %s", err)
}
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}()
}
go func() {
sig := <-sigs
log.Infof("I have to go... %+v", sig)
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log.Info("Stopping server")
srv.Close()
stopChan <- true
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}()
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//negroni.Use(middlewares.NewCircuitBreaker(oxyLogger))
//negroni.Use(middlewares.NewRoutes(configurationRouter))
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srv = prepareServer(configurationRouter, globalConfiguration, nil, loggerMiddleware, metrics)
go startServer(srv, globalConfiguration)
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<-stopChan
log.Info("Shutting down")
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}
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func startServer(srv *manners.GracefulServer, globalConfiguration *GlobalConfiguration) {
log.Info("Starting server")
log.Debugf("Server %s", spew.Sdump(srv))
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if len(globalConfiguration.CertFile) > 0 && len(globalConfiguration.KeyFile) > 0 {
err := srv.ListenAndServeTLS(globalConfiguration.CertFile, globalConfiguration.KeyFile)
if err != nil {
netOpError, ok := err.(*net.OpError)
if ok && netOpError.Err.Error() != "use of closed network connection" {
log.Fatal("Error creating server: ", err)
}
}
} else {
err := srv.ListenAndServe()
if err != nil {
netOpError, ok := err.(*net.OpError)
if ok && netOpError.Err.Error() != "use of closed network connection" {
log.Fatal("Error creating server: ", err)
}
}
}
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log.Info("Server stopped")
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}
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func prepareServer(router *mux.Router, globalConfiguration *GlobalConfiguration, oldServer *manners.GracefulServer, middlewares ...negroni.Handler) *manners.GracefulServer {
log.Info("Preparing server")
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// middlewares
var negroni = negroni.New()
for _, middleware := range middlewares {
negroni.Use(middleware)
}
negroni.UseHandler(router)
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if oldServer == nil {
return manners.NewWithServer(
&http.Server{
Addr: globalConfiguration.Port,
Handler: negroni,
})
} else {
server, err := oldServer.HijackListener(&http.Server{
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Addr: globalConfiguration.Port,
Handler: negroni,
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}, nil)
if err != nil {
log.Fatalf("Error hijacking server %s", err)
return nil
} else {
return server
}
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}
}
func LoadConfig(configurations configs, globalConfiguration *GlobalConfiguration) (*mux.Router, error) {
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router := mux.NewRouter()
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router.NotFoundHandler = http.HandlerFunc(notFoundHandler)
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backends := map[string]http.Handler{}
for _, configuration := range configurations {
for frontendName, frontend := range configuration.Frontends {
log.Debugf("Creating frontend %s", frontendName)
fwd, _ := forward.New(forward.Logger(oxyLogger))
newRoute := router.NewRoute().Name(frontendName)
for routeName, route := range frontend.Routes {
log.Debugf("Creating route %s %s:%s", routeName, route.Rule, route.Value)
newRouteReflect := Invoke(newRoute, route.Rule, route.Value)
newRoute = newRouteReflect[0].Interface().(*mux.Route)
}
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("Backend not found: " + frontend.Backend)
}
lbMethod, err := NewLoadBalancerMethod(configuration.Backends[frontend.Backend].LoadBalancer)
if err != nil {
configuration.Backends[frontend.Backend].LoadBalancer = &LoadBalancer{Method: "wrr"}
}
switch lbMethod {
case drr:
log.Infof("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.Infof("Creating server %s %s", serverName, url.String())
rebalancer.UpsertServer(url, roundrobin.Weight(server.Weight))
}
case wrr:
log.Infof("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.Infof("Creating server %s %s", serverName, url.String())
rr.UpsertServer(url, roundrobin.Weight(server.Weight))
}
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}
var negroni = negroni.New()
if configuration.Backends[frontend.Backend].CircuitBreaker != nil {
log.Infof("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.Infof("Reusing backend %s", frontend.Backend)
}
// stream.New(backends[frontend.Backend], stream.Retry("IsNetworkError() && Attempts() <= " + strconv.Itoa(globalConfiguration.Replay)), stream.Logger(oxyLogger))
newRoute.Handler(backends[frontend.Backend])
err := newRoute.GetError()
if err != nil {
log.Error("Error building route: %s", err)
}
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}
}
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return router, nil
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}
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 {
fmtlog.Fatalf("Error reading file: %s", err)
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}
return configuration
}