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// Copyright 2015 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package http
import (
"fmt"
"net/http"
"github.com/google/cadvisor/cmd/internal/api"
"github.com/google/cadvisor/cmd/internal/healthz"
httpmux "github.com/google/cadvisor/cmd/internal/http/mux"
"github.com/google/cadvisor/cmd/internal/pages"
"github.com/google/cadvisor/cmd/internal/pages/static"
"github.com/google/cadvisor/container"
"github.com/google/cadvisor/manager"
"github.com/google/cadvisor/metrics"
"github.com/google/cadvisor/validate"
auth "github.com/abbot/go-http-auth"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"k8s.io/klog/v2"
"k8s.io/utils/clock"
)
func RegisterHandlers(mux httpmux.Mux, containerManager manager.Manager, httpAuthFile, httpAuthRealm, httpDigestFile, httpDigestRealm string, urlBasePrefix string) error {
// Basic health handler.
if err := healthz.RegisterHandler(mux); err != nil {
return fmt.Errorf("failed to register healthz handler: %s", err)
}
// Validation/Debug handler.
mux.HandleFunc(validate.ValidatePage, func(w http.ResponseWriter, r *http.Request) {
err := validate.HandleRequest(w, containerManager)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
})
// Register API handler.
if err := api.RegisterHandlers(mux, containerManager); err != nil {
return fmt.Errorf("failed to register API handlers: %s", err)
}
// Redirect / to containers page.
mux.Handle("/", http.RedirectHandler(urlBasePrefix+pages.ContainersPage, http.StatusTemporaryRedirect))
var authenticated bool
// Setup the authenticator object
if httpAuthFile != "" {
klog.V(1).Infof("Using auth file %s", httpAuthFile)
secrets := auth.HtpasswdFileProvider(httpAuthFile)
authenticator := auth.NewBasicAuthenticator(httpAuthRealm, secrets)
mux.HandleFunc(static.StaticResource, authenticator.Wrap(staticHandler))
if err := pages.RegisterHandlersBasic(mux, containerManager, authenticator, urlBasePrefix); err != nil {
return fmt.Errorf("failed to register pages auth handlers: %s", err)
}
authenticated = true
}
if httpAuthFile == "" && httpDigestFile != "" {
klog.V(1).Infof("Using digest file %s", httpDigestFile)
secrets := auth.HtdigestFileProvider(httpDigestFile)
authenticator := auth.NewDigestAuthenticator(httpDigestRealm, secrets)
mux.HandleFunc(static.StaticResource, authenticator.Wrap(staticHandler))
if err := pages.RegisterHandlersDigest(mux, containerManager, authenticator, urlBasePrefix); err != nil {
return fmt.Errorf("failed to register pages digest handlers: %s", err)
}
authenticated = true
}
// Change handler based on authenticator initalization
if !authenticated {
mux.HandleFunc(static.StaticResource, staticHandlerNoAuth)
if err := pages.RegisterHandlersBasic(mux, containerManager, nil, urlBasePrefix); err != nil {
return fmt.Errorf("failed to register pages handlers: %s", err)
}
}
return nil
}
// RegisterPrometheusHandler creates a new PrometheusCollector and configures
// the provided HTTP mux to handle the given Prometheus endpoint.
func RegisterPrometheusHandler(mux httpmux.Mux, resourceManager manager.Manager, prometheusEndpoint string,
f metrics.ContainerLabelsFunc, includedMetrics container.MetricSet) {
goCollector := prometheus.NewGoCollector()
processCollector := prometheus.NewProcessCollector(prometheus.ProcessCollectorOpts{})
machineCollector := metrics.NewPrometheusMachineCollector(resourceManager, includedMetrics)
mux.Handle(prometheusEndpoint, http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
opts, err := api.GetRequestOptions(req)
if err != nil {
http.Error(w, "No metrics gathered, last error:\n\n"+err.Error(), http.StatusInternalServerError)
return
}
opts.Count = 1 // we only want the latest datapoint
opts.Recursive = true // get all child containers
r := prometheus.NewRegistry()
r.MustRegister(
metrics.NewPrometheusCollector(resourceManager, f, includedMetrics, clock.RealClock{}, opts),
machineCollector,
goCollector,
processCollector,
)
promhttp.HandlerFor(r, promhttp.HandlerOpts{ErrorHandling: promhttp.ContinueOnError}).ServeHTTP(w, req)
}))
}
func staticHandlerNoAuth(w http.ResponseWriter, r *http.Request) {
static.HandleRequest(w, r.URL)
}
func staticHandler(w http.ResponseWriter, r *auth.AuthenticatedRequest) {
static.HandleRequest(w, r.URL)
}
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