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332 lines (296 loc) · 11.9 KB
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package server
import (
"encoding/json"
"expvar"
"fmt"
"io/ioutil"
"net/http"
"runtime"
"github.com/codegangsta/negroni"
"github.com/containous/mux"
"github.com/containous/traefik/autogen"
"github.com/containous/traefik/log"
"github.com/containous/traefik/middlewares"
"github.com/containous/traefik/safe"
"github.com/containous/traefik/types"
"github.com/containous/traefik/version"
"github.com/elazarl/go-bindata-assetfs"
"github.com/prometheus/client_golang/prometheus/promhttp"
thoas_stats "github.com/thoas/stats"
"github.com/unrolled/render"
)
var (
metrics = thoas_stats.New()
statsRecorder *middlewares.StatsRecorder
)
// 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"`
Statistics *types.Statistics `description:"Enable more detailed statistics"`
Metrics *types.Metrics `description:"Enable a metrics exporter"`
Path string `description:"Root path for dashboard and API"`
server *Server
Auth *types.Auth
}
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.Constraints) error {
systemRouter := mux.NewRouter()
if provider.Path == "" {
provider.Path = "/"
}
if provider.Path != "/" {
if provider.Path[len(provider.Path)-1:] != "/" {
provider.Path += "/"
}
systemRouter.Methods("GET").Path("/").HandlerFunc(func(response http.ResponseWriter, request *http.Request) {
http.Redirect(response, request, provider.Path, 302)
})
}
// Prometheus route
if provider.Metrics != nil && provider.Metrics.Prometheus != nil {
systemRouter.Methods("GET").Path(provider.Path + "metrics").Handler(promhttp.Handler())
}
// health route
systemRouter.Methods("GET").Path(provider.Path + "health").HandlerFunc(provider.getHealthHandler)
// ping route
systemRouter.Methods("GET").Path(provider.Path + "ping").HandlerFunc(provider.getPingHandler)
// API routes
systemRouter.Methods("GET").Path(provider.Path + "api").HandlerFunc(provider.getConfigHandler)
systemRouter.Methods("GET").Path(provider.Path + "api/version").HandlerFunc(provider.getVersionHandler)
systemRouter.Methods("GET").Path(provider.Path + "api/providers").HandlerFunc(provider.getConfigHandler)
systemRouter.Methods("GET").Path(provider.Path + "api/providers/{provider}").HandlerFunc(provider.getProviderHandler)
systemRouter.Methods("PUT").Path(provider.Path + "api/providers/{provider}").HandlerFunc(func(response http.ResponseWriter, request *http.Request) {
if provider.ReadOnly {
response.WriteHeader(http.StatusForbidden)
fmt.Fprint(response, "REST API is in read-only mode")
return
}
vars := mux.Vars(request)
if vars["provider"] != "web" {
response.WriteHeader(http.StatusBadRequest)
fmt.Fprint(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{ProviderName: "web", Configuration: 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(provider.Path + "api/providers/{provider}/backends").HandlerFunc(provider.getBackendsHandler)
systemRouter.Methods("GET").Path(provider.Path + "api/providers/{provider}/backends/{backend}").HandlerFunc(provider.getBackendHandler)
systemRouter.Methods("GET").Path(provider.Path + "api/providers/{provider}/backends/{backend}/servers").HandlerFunc(provider.getServersHandler)
systemRouter.Methods("GET").Path(provider.Path + "api/providers/{provider}/backends/{backend}/servers/{server}").HandlerFunc(provider.getServerHandler)
systemRouter.Methods("GET").Path(provider.Path + "api/providers/{provider}/frontends").HandlerFunc(provider.getFrontendsHandler)
systemRouter.Methods("GET").Path(provider.Path + "api/providers/{provider}/frontends/{frontend}").HandlerFunc(provider.getFrontendHandler)
systemRouter.Methods("GET").Path(provider.Path + "api/providers/{provider}/frontends/{frontend}/routes").HandlerFunc(provider.getRoutesHandler)
systemRouter.Methods("GET").Path(provider.Path + "api/providers/{provider}/frontends/{frontend}/routes/{route}").HandlerFunc(provider.getRouteHandler)
// Expose dashboard
systemRouter.Methods("GET").Path(provider.Path).HandlerFunc(func(response http.ResponseWriter, request *http.Request) {
http.Redirect(response, request, provider.Path+"dashboard/", 302)
})
systemRouter.Methods("GET").PathPrefix(provider.Path + "dashboard/").Handler(http.StripPrefix(provider.Path+"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(provider.Path + "debug/vars").HandlerFunc(expvarHandler)
}
go func() {
var err error
var negroni = negroni.New()
if provider.Auth != nil {
authMiddleware, err := middlewares.NewAuthenticator(provider.Auth)
if err != nil {
log.Fatal("Error creating Auth: ", err)
}
negroni.Use(authMiddleware)
}
negroni.UseHandler(systemRouter)
if len(provider.CertFile) > 0 && len(provider.KeyFile) > 0 {
err = http.ListenAndServeTLS(provider.Address, provider.CertFile, provider.KeyFile, negroni)
} else {
err = http.ListenAndServe(provider.Address, negroni)
}
if err != nil {
log.Fatal("Error creating server: ", err)
}
}()
return nil
}
// healthResponse combines data returned by thoas/stats with statistics (if
// they are enabled).
type healthResponse struct {
*thoas_stats.Data
*middlewares.Stats
}
func (provider *WebProvider) getHealthHandler(response http.ResponseWriter, request *http.Request) {
health := &healthResponse{Data: metrics.Data()}
if statsRecorder != nil {
health.Stats = statsRecorder.Data()
}
templatesRenderer.JSON(response, http.StatusOK, health)
}
func (provider *WebProvider) getPingHandler(response http.ResponseWriter, request *http.Request) {
fmt.Fprint(response, "OK")
}
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) getVersionHandler(response http.ResponseWriter, request *http.Request) {
v := struct {
Version string
Codename string
}{
Version: version.Version,
Codename: version.Codename,
}
templatesRenderer.JSON(response, http.StatusOK, v)
}
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.Fprint(w, "{\n")
first := true
expvar.Do(func(kv expvar.KeyValue) {
if !first {
fmt.Fprint(w, ",\n")
}
first = false
fmt.Fprintf(w, "%q: %s", kv.Key, kv.Value)
})
fmt.Fprint(w, "\n}\n")
}
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