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package main
import (
"encoding/json"
"expvar"
"fmt"
"io/ioutil"
"net/http"
"runtime"
log "github.com/Sirupsen/logrus"
"github.com/containous/mux"
"github.com/containous/traefik/autogen"
"github.com/containous/traefik/safe"
"github.com/containous/traefik/types"
"github.com/elazarl/go-bindata-assetfs"
"github.com/thoas/stats"
"github.com/unrolled/render"
)
var metrics = stats.New()
// WebProvider is a provider.Provider implementation that provides the UI.
// FIXME to be handled another way.
type WebProvider struct {
Address string `description:"Web administration port"`
CertFile string `description:"SSL certificate"`
KeyFile string `description:"SSL certificate"`
ReadOnly bool `description:"Enable read only API"`
server *Server
}
var (
templatesRenderer = render.New(render.Options{
Directory: "nowhere",
})
)
func init() {
expvar.Publish("Goroutines", expvar.Func(goroutines))
}
func goroutines() interface{} {
return runtime.NumGoroutine()
}
// Provide allows the provider to provide configurations to traefik
// using the given configuration channel.
func (provider *WebProvider) Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool, _ []types.Constraint) error {
systemRouter := mux.NewRouter()
// health route
systemRouter.Methods("GET").Path("/health").HandlerFunc(provider.getHealthHandler)
// API routes
systemRouter.Methods("GET").Path("/api").HandlerFunc(provider.getConfigHandler)
systemRouter.Methods("GET").Path("/api/providers").HandlerFunc(provider.getConfigHandler)
systemRouter.Methods("GET").Path("/api/providers/{provider}").HandlerFunc(provider.getProviderHandler)
systemRouter.Methods("PUT").Path("/api/providers/{provider}").HandlerFunc(func(response http.ResponseWriter, request *http.Request) {
if provider.ReadOnly {
response.WriteHeader(http.StatusForbidden)
fmt.Fprintf(response, "REST API is in read-only mode")
return
}
vars := mux.Vars(request)
if vars["provider"] != "web" {
response.WriteHeader(http.StatusBadRequest)
fmt.Fprintf(response, "Only 'web' provider can be updated through the REST API")
return
}
configuration := new(types.Configuration)
body, _ := ioutil.ReadAll(request.Body)
err := json.Unmarshal(body, configuration)
if err == nil {
configurationChan <- types.ConfigMessage{"web", configuration}
provider.getConfigHandler(response, request)
} else {
log.Errorf("Error parsing configuration %+v", err)
http.Error(response, fmt.Sprintf("%+v", err), http.StatusBadRequest)
}
})
systemRouter.Methods("GET").Path("/api/providers/{provider}/backends").HandlerFunc(provider.getBackendsHandler)
systemRouter.Methods("GET").Path("/api/providers/{provider}/backends/{backend}").HandlerFunc(provider.getBackendHandler)
systemRouter.Methods("GET").Path("/api/providers/{provider}/backends/{backend}/servers").HandlerFunc(provider.getServersHandler)
systemRouter.Methods("GET").Path("/api/providers/{provider}/backends/{backend}/servers/{server}").HandlerFunc(provider.getServerHandler)
systemRouter.Methods("GET").Path("/api/providers/{provider}/frontends").HandlerFunc(provider.getFrontendsHandler)
systemRouter.Methods("GET").Path("/api/providers/{provider}/frontends/{frontend}").HandlerFunc(provider.getFrontendHandler)
systemRouter.Methods("GET").Path("/api/providers/{provider}/frontends/{frontend}/routes").HandlerFunc(provider.getRoutesHandler)
systemRouter.Methods("GET").Path("/api/providers/{provider}/frontends/{frontend}/routes/{route}").HandlerFunc(provider.getRouteHandler)
// Expose dashboard
systemRouter.Methods("GET").Path("/").HandlerFunc(func(response http.ResponseWriter, request *http.Request) {
http.Redirect(response, request, "/dashboard/", 302)
})
systemRouter.Methods("GET").PathPrefix("/dashboard/").Handler(http.StripPrefix("/dashboard/", http.FileServer(&assetfs.AssetFS{Asset: autogen.Asset, AssetInfo: autogen.AssetInfo, AssetDir: autogen.AssetDir, Prefix: "static"})))
// expvars
if provider.server.globalConfiguration.Debug {
systemRouter.Methods("GET").Path("/debug/vars").HandlerFunc(expvarHandler)
}
go func() {
if len(provider.CertFile) > 0 && len(provider.KeyFile) > 0 {
err := http.ListenAndServeTLS(provider.Address, provider.CertFile, provider.KeyFile, systemRouter)
if err != nil {
log.Fatal("Error creating server: ", err)
}
} else {
err := http.ListenAndServe(provider.Address, systemRouter)
if err != nil {
log.Fatal("Error creating server: ", err)
}
}
}()
return nil
}
func (provider *WebProvider) getHealthHandler(response http.ResponseWriter, request *http.Request) {
templatesRenderer.JSON(response, http.StatusOK, metrics.Data())
}
func (provider *WebProvider) getConfigHandler(response http.ResponseWriter, request *http.Request) {
currentConfigurations := provider.server.currentConfigurations.Get().(configs)
templatesRenderer.JSON(response, http.StatusOK, currentConfigurations)
}
func (provider *WebProvider) getProviderHandler(response http.ResponseWriter, request *http.Request) {
vars := mux.Vars(request)
providerID := vars["provider"]
currentConfigurations := provider.server.currentConfigurations.Get().(configs)
if provider, ok := currentConfigurations[providerID]; ok {
templatesRenderer.JSON(response, http.StatusOK, provider)
} else {
http.NotFound(response, request)
}
}
func (provider *WebProvider) getBackendsHandler(response http.ResponseWriter, request *http.Request) {
vars := mux.Vars(request)
providerID := vars["provider"]
currentConfigurations := provider.server.currentConfigurations.Get().(configs)
if provider, ok := currentConfigurations[providerID]; ok {
templatesRenderer.JSON(response, http.StatusOK, provider.Backends)
} else {
http.NotFound(response, request)
}
}
func (provider *WebProvider) getBackendHandler(response http.ResponseWriter, request *http.Request) {
vars := mux.Vars(request)
providerID := vars["provider"]
backendID := vars["backend"]
currentConfigurations := provider.server.currentConfigurations.Get().(configs)
if provider, ok := currentConfigurations[providerID]; ok {
if backend, ok := provider.Backends[backendID]; ok {
templatesRenderer.JSON(response, http.StatusOK, backend)
return
}
}
http.NotFound(response, request)
}
func (provider *WebProvider) getServersHandler(response http.ResponseWriter, request *http.Request) {
vars := mux.Vars(request)
providerID := vars["provider"]
backendID := vars["backend"]
currentConfigurations := provider.server.currentConfigurations.Get().(configs)
if provider, ok := currentConfigurations[providerID]; ok {
if backend, ok := provider.Backends[backendID]; ok {
templatesRenderer.JSON(response, http.StatusOK, backend.Servers)
return
}
}
http.NotFound(response, request)
}
func (provider *WebProvider) getServerHandler(response http.ResponseWriter, request *http.Request) {
vars := mux.Vars(request)
providerID := vars["provider"]
backendID := vars["backend"]
serverID := vars["server"]
currentConfigurations := provider.server.currentConfigurations.Get().(configs)
if provider, ok := currentConfigurations[providerID]; ok {
if backend, ok := provider.Backends[backendID]; ok {
if server, ok := backend.Servers[serverID]; ok {
templatesRenderer.JSON(response, http.StatusOK, server)
return
}
}
}
http.NotFound(response, request)
}
func (provider *WebProvider) getFrontendsHandler(response http.ResponseWriter, request *http.Request) {
vars := mux.Vars(request)
providerID := vars["provider"]
currentConfigurations := provider.server.currentConfigurations.Get().(configs)
if provider, ok := currentConfigurations[providerID]; ok {
templatesRenderer.JSON(response, http.StatusOK, provider.Frontends)
} else {
http.NotFound(response, request)
}
}
func (provider *WebProvider) getFrontendHandler(response http.ResponseWriter, request *http.Request) {
vars := mux.Vars(request)
providerID := vars["provider"]
frontendID := vars["frontend"]
currentConfigurations := provider.server.currentConfigurations.Get().(configs)
if provider, ok := currentConfigurations[providerID]; ok {
if frontend, ok := provider.Frontends[frontendID]; ok {
templatesRenderer.JSON(response, http.StatusOK, frontend)
return
}
}
http.NotFound(response, request)
}
func (provider *WebProvider) getRoutesHandler(response http.ResponseWriter, request *http.Request) {
vars := mux.Vars(request)
providerID := vars["provider"]
frontendID := vars["frontend"]
currentConfigurations := provider.server.currentConfigurations.Get().(configs)
if provider, ok := currentConfigurations[providerID]; ok {
if frontend, ok := provider.Frontends[frontendID]; ok {
templatesRenderer.JSON(response, http.StatusOK, frontend.Routes)
return
}
}
http.NotFound(response, request)
}
func (provider *WebProvider) getRouteHandler(response http.ResponseWriter, request *http.Request) {
vars := mux.Vars(request)
providerID := vars["provider"]
frontendID := vars["frontend"]
routeID := vars["route"]
currentConfigurations := provider.server.currentConfigurations.Get().(configs)
if provider, ok := currentConfigurations[providerID]; ok {
if frontend, ok := provider.Frontends[frontendID]; ok {
if route, ok := frontend.Routes[routeID]; ok {
templatesRenderer.JSON(response, http.StatusOK, route)
return
}
}
}
http.NotFound(response, request)
}
func expvarHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
fmt.Fprintf(w, "{\n")
first := true
expvar.Do(func(kv expvar.KeyValue) {
if !first {
fmt.Fprintf(w, ",\n")
}
first = false
fmt.Fprintf(w, "%q: %s", kv.Key, kv.Value)
})
fmt.Fprintf(w, "\n}\n")
}