youtubebeat/vendor/github.com/elastic/beats/libbeat/api/server.go

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2018-11-18 11:08:38 +01:00
// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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 api
import (
"fmt"
"net/http"
"net/url"
"strconv"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/common/cfgwarn"
"github.com/elastic/beats/libbeat/logp"
"github.com/elastic/beats/libbeat/monitoring"
)
// Start starts the metrics api endpoint on the configured host and port
func Start(cfg *common.Config) {
cfgwarn.Experimental("Metrics endpoint is enabled.")
config := DefaultConfig
cfg.Unpack(&config)
logp.Info("Starting stats endpoint")
go func() {
mux := http.NewServeMux()
// register handlers
mux.HandleFunc("/", rootHandler())
mux.HandleFunc("/state", stateHandler)
mux.HandleFunc("/stats", statsHandler)
mux.HandleFunc("/dataset", datasetHandler)
url := config.Host + ":" + strconv.Itoa(config.Port)
logp.Info("Metrics endpoint listening on: %s", url)
endpoint := http.ListenAndServe(url, mux)
logp.Info("finished starting stats endpoint: %v", endpoint)
}()
}
func rootHandler() func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
// Return error page
if r.URL.Path != "/" {
http.NotFound(w, r)
return
}
w.Header().Set("Content-Type", "application/json; charset=utf-8")
data := monitoring.CollectStructSnapshot(monitoring.GetNamespace("info").GetRegistry(), monitoring.Full, false)
print(w, data, r.URL)
}
}
// stateHandler reports state metrics
func stateHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
data := monitoring.CollectStructSnapshot(monitoring.GetNamespace("state").GetRegistry(), monitoring.Full, false)
print(w, data, r.URL)
}
// statsHandler report expvar and all libbeat/monitoring metrics
func statsHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
data := monitoring.CollectStructSnapshot(monitoring.GetNamespace("stats").GetRegistry(), monitoring.Full, false)
print(w, data, r.URL)
}
func datasetHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
data := monitoring.CollectStructSnapshot(monitoring.GetNamespace("dataset").GetRegistry(), monitoring.Full, false)
print(w, data, r.URL)
}
func print(w http.ResponseWriter, data common.MapStr, u *url.URL) {
query := u.Query()
if _, ok := query["pretty"]; ok {
fmt.Fprintf(w, data.StringToPrint())
} else {
fmt.Fprintf(w, data.String())
}
}