mirror of
https://github.com/prometheus-community/json_exporter
synced 2024-12-24 23:42:41 +00:00
118 lines
4.0 KiB
Go
118 lines
4.0 KiB
Go
// Copyright 2020 The Prometheus Authors
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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 cmd
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import (
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"context"
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"encoding/json"
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"net/http"
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"os"
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"github.com/go-kit/kit/log"
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"github.com/go-kit/kit/log/level"
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"github.com/prometheus-community/json_exporter/config"
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"github.com/prometheus-community/json_exporter/exporter"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"github.com/prometheus/common/promlog"
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"github.com/prometheus/common/promlog/flag"
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"github.com/prometheus/common/version"
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"github.com/prometheus/exporter-toolkit/web"
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"gopkg.in/alecthomas/kingpin.v2"
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)
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var (
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configFile = kingpin.Flag("config.file", "JSON exporter configuration file.").Default("config.yml").ExistingFile()
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listenAddress = kingpin.Flag("web.listen-address", "The address to listen on for HTTP requests.").Default(":7979").String()
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configCheck = kingpin.Flag("config.check", "If true validate the config file and then exit.").Default("false").Bool()
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tlsConfigFile = kingpin.Flag("web.config", "[EXPERIMENTAL] Path to config yaml file that can enable TLS or authentication.").Default("").String()
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)
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func Run() {
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promlogConfig := &promlog.Config{}
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flag.AddFlags(kingpin.CommandLine, promlogConfig)
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kingpin.Version(version.Print("json_exporter"))
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kingpin.HelpFlag.Short('h')
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kingpin.Parse()
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logger := promlog.New(promlogConfig)
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level.Info(logger).Log("msg", "Starting json_exporter", "version", version.Info()) //nolint:errcheck
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level.Info(logger).Log("msg", "Build context", "build", version.BuildContext()) //nolint:errcheck
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level.Info(logger).Log("msg", "Loading config file", "file", *configFile) //nolint:errcheck
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config, err := config.LoadConfig(*configFile)
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if err != nil {
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level.Error(logger).Log("msg", "Error loading config", "err", err) //nolint:errcheck
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os.Exit(1)
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}
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configJson, err := json.Marshal(config)
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if err != nil {
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level.Error(logger).Log("msg", "Failed to marshal config to JSON", "err", err) //nolint:errcheck
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}
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level.Info(logger).Log("msg", "Loaded config file", "config", string(configJson)) //nolint:errcheck
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if *configCheck {
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os.Exit(0)
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}
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http.Handle("/metrics", promhttp.Handler())
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http.HandleFunc("/probe", func(w http.ResponseWriter, req *http.Request) {
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probeHandler(w, req, logger, config)
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})
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server := &http.Server{Addr: *listenAddress}
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if err := web.ListenAndServe(server, *tlsConfigFile, logger); err != nil {
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level.Error(logger).Log("msg", "Failed to start the server", "err", err) //nolint:errcheck
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os.Exit(1)
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}
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}
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func probeHandler(w http.ResponseWriter, r *http.Request, logger log.Logger, config config.Config) {
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ctx, cancel := context.WithCancel(r.Context())
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defer cancel()
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r = r.WithContext(ctx)
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registry := prometheus.NewPedanticRegistry()
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metrics, err := exporter.CreateMetricsList(config)
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if err != nil {
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level.Error(logger).Log("msg", "Failed to create metrics list from config", "err", err) //nolint:errcheck
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}
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jsonMetricCollector := exporter.JsonMetricCollector{JsonMetrics: metrics}
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jsonMetricCollector.Logger = logger
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target := r.URL.Query().Get("target")
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if target == "" {
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http.Error(w, "Target parameter is missing", http.StatusBadRequest)
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return
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}
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data, err := exporter.FetchJson(ctx, logger, target, config)
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if err != nil {
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http.Error(w, "Failed to fetch JSON response. TARGET: "+target+", ERROR: "+err.Error(), http.StatusServiceUnavailable)
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return
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}
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jsonMetricCollector.Data = data
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registry.MustRegister(jsonMetricCollector)
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h := promhttp.HandlerFor(registry, promhttp.HandlerOpts{})
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h.ServeHTTP(w, r)
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}
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