e76096d4f6
This change generalizes the existing ContainerNameToLabelsFunc to allow the user to fully control all labels attached to exported Prometheus metrics. The existing behavior is available as DefaultContainerLabelsFunc and is used if no custom function is provided. This will allow Kubernetes to filter out its internal Docker labels.
114 lines
4.0 KiB
Go
114 lines
4.0 KiB
Go
// Copyright 2015 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package http
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import (
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"fmt"
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"net/http"
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"github.com/google/cadvisor/api"
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"github.com/google/cadvisor/healthz"
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httpmux "github.com/google/cadvisor/http/mux"
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"github.com/google/cadvisor/manager"
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"github.com/google/cadvisor/metrics"
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"github.com/google/cadvisor/pages"
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"github.com/google/cadvisor/pages/static"
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"github.com/google/cadvisor/validate"
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auth "github.com/abbot/go-http-auth"
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"github.com/golang/glog"
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"github.com/prometheus/client_golang/prometheus"
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)
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func RegisterHandlers(mux httpmux.Mux, containerManager manager.Manager, httpAuthFile, httpAuthRealm, httpDigestFile, httpDigestRealm string) error {
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// Basic health handler.
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if err := healthz.RegisterHandler(mux); err != nil {
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return fmt.Errorf("failed to register healthz handler: %s", err)
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}
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// Validation/Debug handler.
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mux.HandleFunc(validate.ValidatePage, func(w http.ResponseWriter, r *http.Request) {
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err := validate.HandleRequest(w, containerManager)
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if err != nil {
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fmt.Fprintf(w, "%s", err)
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}
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})
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// Register API handler.
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if err := api.RegisterHandlers(mux, containerManager); err != nil {
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return fmt.Errorf("failed to register API handlers: %s", err)
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}
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// Redirect / to containers page.
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mux.Handle("/", http.RedirectHandler(pages.ContainersPage, http.StatusTemporaryRedirect))
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var authenticated bool = false
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// Setup the authenticator object
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if httpAuthFile != "" {
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glog.Infof("Using auth file %s", httpAuthFile)
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secrets := auth.HtpasswdFileProvider(httpAuthFile)
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authenticator := auth.NewBasicAuthenticator(httpAuthRealm, secrets)
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mux.HandleFunc(static.StaticResource, authenticator.Wrap(staticHandler))
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if err := pages.RegisterHandlersBasic(mux, containerManager, authenticator); err != nil {
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return fmt.Errorf("failed to register pages auth handlers: %s", err)
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}
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authenticated = true
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}
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if httpAuthFile == "" && httpDigestFile != "" {
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glog.Infof("Using digest file %s", httpDigestFile)
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secrets := auth.HtdigestFileProvider(httpDigestFile)
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authenticator := auth.NewDigestAuthenticator(httpDigestRealm, secrets)
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mux.HandleFunc(static.StaticResource, authenticator.Wrap(staticHandler))
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if err := pages.RegisterHandlersDigest(mux, containerManager, authenticator); err != nil {
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return fmt.Errorf("failed to register pages digest handlers: %s", err)
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}
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authenticated = true
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}
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// Change handler based on authenticator initalization
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if !authenticated {
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mux.HandleFunc(static.StaticResource, staticHandlerNoAuth)
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if err := pages.RegisterHandlersBasic(mux, containerManager, nil); err != nil {
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return fmt.Errorf("failed to register pages handlers: %s", err)
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}
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}
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return nil
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}
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// RegisterPrometheusHandler creates a new PrometheusCollector, registers it
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// on the global registry and configures the provided HTTP mux to handle the
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// given Prometheus endpoint.
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func RegisterPrometheusHandler(mux httpmux.Mux, containerManager manager.Manager, prometheusEndpoint string, f metrics.ContainerLabelsFunc) {
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collector := metrics.NewPrometheusCollector(containerManager, f)
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prometheus.MustRegister(collector)
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mux.Handle(prometheusEndpoint, prometheus.Handler())
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}
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func staticHandlerNoAuth(w http.ResponseWriter, r *http.Request) {
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err := static.HandleRequest(w, r.URL)
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if err != nil {
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fmt.Fprintf(w, "%s", err)
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}
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}
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func staticHandler(w http.ResponseWriter, r *auth.AuthenticatedRequest) {
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err := static.HandleRequest(w, r.URL)
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if err != nil {
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fmt.Fprintf(w, "%s", err)
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}
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}
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