337 lines
12 KiB
Go
337 lines
12 KiB
Go
package web
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import (
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"encoding/json"
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"expvar"
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"fmt"
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"io/ioutil"
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"net/http"
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"runtime"
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"github.com/containous/mux"
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"github.com/containous/traefik/autogen"
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"github.com/containous/traefik/log"
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"github.com/containous/traefik/middlewares"
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"github.com/containous/traefik/safe"
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"github.com/containous/traefik/types"
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"github.com/containous/traefik/version"
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"github.com/elazarl/go-bindata-assetfs"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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thoas_stats "github.com/thoas/stats"
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"github.com/unrolled/render"
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"github.com/urfave/negroni"
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)
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// Provider is a provider.Provider implementation that provides the UI
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type Provider struct {
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Address string `description:"Web administration port"`
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CertFile string `description:"SSL certificate"`
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KeyFile string `description:"SSL certificate"`
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ReadOnly bool `description:"Enable read only API"`
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Statistics *types.Statistics `description:"Enable more detailed statistics"`
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Metrics *types.Metrics `description:"Enable a metrics exporter"`
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Path string `description:"Root path for dashboard and API"`
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Auth *types.Auth
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Debug bool
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CurrentConfigurations *safe.Safe
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Stats *thoas_stats.Stats
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StatsRecorder *middlewares.StatsRecorder
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}
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var (
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templatesRenderer = render.New(render.Options{
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Directory: "nowhere",
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})
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)
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func init() {
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expvar.Publish("Goroutines", expvar.Func(goroutines))
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}
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func goroutines() interface{} {
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return runtime.NumGoroutine()
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}
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// Provide allows the provider to provide configurations to traefik
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// using the given configuration channel.
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func (provider *Provider) Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool, _ types.Constraints) error {
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systemRouter := mux.NewRouter()
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if provider.Path == "" {
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provider.Path = "/"
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}
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if provider.Path != "/" {
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if provider.Path[len(provider.Path)-1:] != "/" {
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provider.Path += "/"
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}
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systemRouter.Methods("GET").Path("/").HandlerFunc(func(response http.ResponseWriter, request *http.Request) {
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http.Redirect(response, request, provider.Path, 302)
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})
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}
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// Prometheus route
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if provider.Metrics != nil && provider.Metrics.Prometheus != nil {
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systemRouter.Methods("GET").Path(provider.Path + "metrics").Handler(promhttp.Handler())
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}
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// health route
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systemRouter.Methods("GET").Path(provider.Path + "health").HandlerFunc(provider.getHealthHandler)
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// ping route
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systemRouter.Methods("GET", "HEAD").Path(provider.Path + "ping").HandlerFunc(provider.getPingHandler)
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// API routes
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systemRouter.Methods("GET").Path(provider.Path + "api").HandlerFunc(provider.getConfigHandler)
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systemRouter.Methods("GET").Path(provider.Path + "api/version").HandlerFunc(provider.getVersionHandler)
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systemRouter.Methods("GET").Path(provider.Path + "api/providers").HandlerFunc(provider.getConfigHandler)
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systemRouter.Methods("GET").Path(provider.Path + "api/providers/{provider}").HandlerFunc(provider.getProviderHandler)
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systemRouter.Methods("PUT").Path(provider.Path + "api/providers/{provider}").HandlerFunc(func(response http.ResponseWriter, request *http.Request) {
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if provider.ReadOnly {
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response.WriteHeader(http.StatusForbidden)
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fmt.Fprint(response, "REST API is in read-only mode")
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return
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}
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vars := mux.Vars(request)
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if vars["provider"] != "web" {
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response.WriteHeader(http.StatusBadRequest)
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fmt.Fprint(response, "Only 'web' provider can be updated through the REST API")
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return
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}
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configuration := new(types.Configuration)
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body, _ := ioutil.ReadAll(request.Body)
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err := json.Unmarshal(body, configuration)
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if err == nil {
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configurationChan <- types.ConfigMessage{ProviderName: "web", Configuration: configuration}
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provider.getConfigHandler(response, request)
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} else {
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log.Errorf("Error parsing configuration %+v", err)
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http.Error(response, fmt.Sprintf("%+v", err), http.StatusBadRequest)
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}
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})
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systemRouter.Methods("GET").Path(provider.Path + "api/providers/{provider}/backends").HandlerFunc(provider.getBackendsHandler)
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systemRouter.Methods("GET").Path(provider.Path + "api/providers/{provider}/backends/{backend}").HandlerFunc(provider.getBackendHandler)
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systemRouter.Methods("GET").Path(provider.Path + "api/providers/{provider}/backends/{backend}/servers").HandlerFunc(provider.getServersHandler)
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systemRouter.Methods("GET").Path(provider.Path + "api/providers/{provider}/backends/{backend}/servers/{server}").HandlerFunc(provider.getServerHandler)
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systemRouter.Methods("GET").Path(provider.Path + "api/providers/{provider}/frontends").HandlerFunc(provider.getFrontendsHandler)
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systemRouter.Methods("GET").Path(provider.Path + "api/providers/{provider}/frontends/{frontend}").HandlerFunc(provider.getFrontendHandler)
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systemRouter.Methods("GET").Path(provider.Path + "api/providers/{provider}/frontends/{frontend}/routes").HandlerFunc(provider.getRoutesHandler)
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systemRouter.Methods("GET").Path(provider.Path + "api/providers/{provider}/frontends/{frontend}/routes/{route}").HandlerFunc(provider.getRouteHandler)
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// Expose dashboard
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systemRouter.Methods("GET").Path(provider.Path).HandlerFunc(func(response http.ResponseWriter, request *http.Request) {
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http.Redirect(response, request, provider.Path+"dashboard/", 302)
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})
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systemRouter.Methods("GET").PathPrefix(provider.Path + "dashboard/").
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Handler(http.StripPrefix(provider.Path+"dashboard/", http.FileServer(&assetfs.AssetFS{Asset: autogen.Asset, AssetInfo: autogen.AssetInfo, AssetDir: autogen.AssetDir, Prefix: "static"})))
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// expvars
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if provider.Debug {
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systemRouter.Methods("GET").Path(provider.Path + "debug/vars").HandlerFunc(expVarHandler)
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}
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safe.Go(func() {
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var err error
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var negroniInstance = negroni.New()
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if provider.Auth != nil {
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authMiddleware, err := middlewares.NewAuthenticator(provider.Auth)
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if err != nil {
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log.Fatal("Error creating Auth: ", err)
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}
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authMiddlewareWrapper := negroni.HandlerFunc(func(w http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
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if r.URL.Path == "/ping" {
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next.ServeHTTP(w, r)
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} else {
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authMiddleware.ServeHTTP(w, r, next)
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}
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})
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negroniInstance.Use(authMiddlewareWrapper)
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}
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negroniInstance.UseHandler(systemRouter)
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if len(provider.CertFile) > 0 && len(provider.KeyFile) > 0 {
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err = http.ListenAndServeTLS(provider.Address, provider.CertFile, provider.KeyFile, negroniInstance)
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} else {
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err = http.ListenAndServe(provider.Address, negroniInstance)
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}
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if err != nil {
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log.Fatal("Error creating server: ", err)
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}
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})
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return nil
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}
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// healthResponse combines data returned by thoas/stats with statistics (if
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// they are enabled).
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type healthResponse struct {
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*thoas_stats.Data
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*middlewares.Stats
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}
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func (provider *Provider) getHealthHandler(response http.ResponseWriter, request *http.Request) {
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health := &healthResponse{Data: provider.Stats.Data()}
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if provider.StatsRecorder != nil {
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health.Stats = provider.StatsRecorder.Data()
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}
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templatesRenderer.JSON(response, http.StatusOK, health)
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}
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func (provider *Provider) getPingHandler(response http.ResponseWriter, request *http.Request) {
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fmt.Fprint(response, "OK")
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}
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func (provider *Provider) getConfigHandler(response http.ResponseWriter, request *http.Request) {
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currentConfigurations := provider.CurrentConfigurations.Get().(types.Configurations)
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templatesRenderer.JSON(response, http.StatusOK, currentConfigurations)
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}
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func (provider *Provider) getVersionHandler(response http.ResponseWriter, request *http.Request) {
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v := struct {
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Version string
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Codename string
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}{
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Version: version.Version,
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Codename: version.Codename,
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}
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templatesRenderer.JSON(response, http.StatusOK, v)
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}
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func (provider *Provider) getProviderHandler(response http.ResponseWriter, request *http.Request) {
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vars := mux.Vars(request)
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providerID := vars["provider"]
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currentConfigurations := provider.CurrentConfigurations.Get().(types.Configurations)
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if provider, ok := currentConfigurations[providerID]; ok {
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templatesRenderer.JSON(response, http.StatusOK, provider)
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} else {
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http.NotFound(response, request)
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}
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}
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func (provider *Provider) getBackendsHandler(response http.ResponseWriter, request *http.Request) {
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vars := mux.Vars(request)
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providerID := vars["provider"]
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currentConfigurations := provider.CurrentConfigurations.Get().(types.Configurations)
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if provider, ok := currentConfigurations[providerID]; ok {
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templatesRenderer.JSON(response, http.StatusOK, provider.Backends)
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} else {
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http.NotFound(response, request)
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}
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}
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func (provider *Provider) getBackendHandler(response http.ResponseWriter, request *http.Request) {
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vars := mux.Vars(request)
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providerID := vars["provider"]
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backendID := vars["backend"]
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currentConfigurations := provider.CurrentConfigurations.Get().(types.Configurations)
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if provider, ok := currentConfigurations[providerID]; ok {
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if backend, ok := provider.Backends[backendID]; ok {
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templatesRenderer.JSON(response, http.StatusOK, backend)
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return
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}
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}
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http.NotFound(response, request)
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}
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func (provider *Provider) getServersHandler(response http.ResponseWriter, request *http.Request) {
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vars := mux.Vars(request)
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providerID := vars["provider"]
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backendID := vars["backend"]
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currentConfigurations := provider.CurrentConfigurations.Get().(types.Configurations)
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if provider, ok := currentConfigurations[providerID]; ok {
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if backend, ok := provider.Backends[backendID]; ok {
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templatesRenderer.JSON(response, http.StatusOK, backend.Servers)
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return
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}
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}
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http.NotFound(response, request)
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}
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func (provider *Provider) getServerHandler(response http.ResponseWriter, request *http.Request) {
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vars := mux.Vars(request)
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providerID := vars["provider"]
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backendID := vars["backend"]
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serverID := vars["server"]
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currentConfigurations := provider.CurrentConfigurations.Get().(types.Configurations)
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if provider, ok := currentConfigurations[providerID]; ok {
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if backend, ok := provider.Backends[backendID]; ok {
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if server, ok := backend.Servers[serverID]; ok {
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templatesRenderer.JSON(response, http.StatusOK, server)
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return
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}
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}
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}
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http.NotFound(response, request)
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}
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func (provider *Provider) getFrontendsHandler(response http.ResponseWriter, request *http.Request) {
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vars := mux.Vars(request)
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providerID := vars["provider"]
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currentConfigurations := provider.CurrentConfigurations.Get().(types.Configurations)
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if provider, ok := currentConfigurations[providerID]; ok {
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templatesRenderer.JSON(response, http.StatusOK, provider.Frontends)
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} else {
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http.NotFound(response, request)
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}
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}
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func (provider *Provider) getFrontendHandler(response http.ResponseWriter, request *http.Request) {
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vars := mux.Vars(request)
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providerID := vars["provider"]
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frontendID := vars["frontend"]
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currentConfigurations := provider.CurrentConfigurations.Get().(types.Configurations)
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if provider, ok := currentConfigurations[providerID]; ok {
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if frontend, ok := provider.Frontends[frontendID]; ok {
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templatesRenderer.JSON(response, http.StatusOK, frontend)
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return
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}
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}
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http.NotFound(response, request)
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}
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func (provider *Provider) getRoutesHandler(response http.ResponseWriter, request *http.Request) {
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vars := mux.Vars(request)
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providerID := vars["provider"]
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frontendID := vars["frontend"]
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currentConfigurations := provider.CurrentConfigurations.Get().(types.Configurations)
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if provider, ok := currentConfigurations[providerID]; ok {
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if frontend, ok := provider.Frontends[frontendID]; ok {
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templatesRenderer.JSON(response, http.StatusOK, frontend.Routes)
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return
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}
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}
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http.NotFound(response, request)
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}
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func (provider *Provider) getRouteHandler(response http.ResponseWriter, request *http.Request) {
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vars := mux.Vars(request)
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providerID := vars["provider"]
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frontendID := vars["frontend"]
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routeID := vars["route"]
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currentConfigurations := provider.CurrentConfigurations.Get().(types.Configurations)
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if provider, ok := currentConfigurations[providerID]; ok {
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if frontend, ok := provider.Frontends[frontendID]; ok {
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if route, ok := frontend.Routes[routeID]; ok {
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templatesRenderer.JSON(response, http.StatusOK, route)
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return
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}
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}
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}
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http.NotFound(response, request)
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}
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func expVarHandler(w http.ResponseWriter, _ *http.Request) {
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w.Header().Set("Content-Type", "application/json; charset=utf-8")
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fmt.Fprint(w, "{\n")
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first := true
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expvar.Do(func(kv expvar.KeyValue) {
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if !first {
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fmt.Fprint(w, ",\n")
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}
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first = false
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fmt.Fprintf(w, "%q: %s", kv.Key, kv.Value)
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})
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fmt.Fprint(w, "\n}\n")
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}
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