143 lines
3.7 KiB
Go
143 lines
3.7 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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"fmt"
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"net/http"
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"time"
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"github.com/prometheus-community/json_exporter/config"
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"github.com/prometheus-community/json_exporter/internal"
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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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log "github.com/sirupsen/logrus"
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"github.com/urfave/cli"
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)
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var (
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defaultOpts = []cli.Flag{
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cli.IntFlag{
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Name: "port",
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Usage: "The port number used to expose metrics via http",
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Value: 7979,
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},
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cli.StringFlag{
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Name: "log-level",
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Usage: "Set Logging level",
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Value: "info",
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},
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}
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)
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func MakeApp() *cli.App {
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app := cli.NewApp()
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app.Name = "json_exporter"
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app.Version = internal.Version
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app.Usage = "A prometheus exporter for scraping metrics from JSON REST API endpoints"
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app.UsageText = "[OPTIONS] CONFIG_PATH"
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app.Action = main
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app.Flags = defaultOpts
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return app
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}
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func main(c *cli.Context) {
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setupLogging(c.String("log-level"))
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internal.Init(c)
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config, err := config.LoadConfig(c.Args()[0])
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if err != nil {
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log.Fatal(err)
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}
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configJson, err := json.MarshalIndent(config, "", "\t")
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if err != nil {
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log.Errorf("Failed to marshal loaded config to JSON. ERROR: '%s'", err)
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}
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log.Infof("Config:\n%s", string(configJson))
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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, config)
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})
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if err := http.ListenAndServe(fmt.Sprintf(":%d", c.Int("port")), nil); err != nil {
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log.Fatal(err)
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}
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}
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func probeHandler(w http.ResponseWriter, r *http.Request, config config.Config) {
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ctx, cancel := context.WithTimeout(r.Context(), time.Duration(config.Global.TimeoutSeconds*float64(time.Second)))
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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 := internal.CreateMetricsList(registry, config)
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if err != nil {
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log.Fatalf("Failed to create metrics from config. Error: %s", err)
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}
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probeSuccessGauge := prometheus.NewGauge(prometheus.GaugeOpts{
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Name: "probe_success",
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Help: "Displays whether or not the probe was a success",
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})
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probeDurationGauge := prometheus.NewGauge(prometheus.GaugeOpts{
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Name: "probe_duration_seconds",
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Help: "Returns how long the probe took to complete in seconds",
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})
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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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start := time.Now()
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registry.MustRegister(probeSuccessGauge)
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registry.MustRegister(probeDurationGauge)
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data, err := internal.FetchJson(ctx, target, config.Headers)
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if err != nil {
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log.Error(err)
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duration := time.Since(start).Seconds()
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log.Errorf("Probe failed. duration_seconds: %f", duration)
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} else {
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internal.Scrape(metrics, data)
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duration := time.Since(start).Seconds()
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probeDurationGauge.Set(duration)
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probeSuccessGauge.Set(1)
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}
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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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func setupLogging(level string) {
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log.SetFormatter(&log.TextFormatter{
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FullTimestamp: true,
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})
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logLevel, err := log.ParseLevel(level)
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if err != nil {
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log.Fatalf("could not set log level to '%s';err:<%s>", level, err)
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}
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log.SetLevel(logLevel)
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}
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