123 lines
3.5 KiB
Go
123 lines
3.5 KiB
Go
// MIT License
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//
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// Copyright (c) 2023 Reinaldy Rafli <aldy505@proton.me>
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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package main
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import (
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"context"
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"errors"
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"flag"
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"log"
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"net/http"
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"os"
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"os/signal"
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"time"
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"github.com/francoispqt/onelog"
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"github.com/jinzhu/configor"
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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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)
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func main() {
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configFile := flag.String("config-file", "", "Path to configuration file")
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listenAddress := flag.String("web.listen-address", ":9428", "Address on which to expose metrics and web interface")
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metricsPath := flag.String("web.telemetry-path", "/metrics", "Path under which to expose metrics")
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flag.Parse()
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// Read configuration from file
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var config Configuration
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err := configor.Load(&config, *configFile)
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if err != nil {
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log.Fatalln(err)
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}
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// Initiate the logger instance. It should be zero-allocated, so we'll use onelog
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logger := onelog.New(os.Stdout, onelog.ALL)
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exporter := &Exporter{
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Endpoints: config.Endpoints,
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Logger: logger,
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}
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r := prometheus.NewRegistry()
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r.MustRegister(exporter)
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mux := http.NewServeMux()
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mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(200)
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_, _ = w.Write([]byte(`<html>
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<head><title>Uptime Exporter</title></head>
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<body>
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<h1>Uptime Exporter</h1>
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<p><a href='` + *metricsPath + `'>Metrics</a></p>
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<p><a href='/health'>Health</a></p>
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</body>
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</html>`))
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})
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mux.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(200)
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w.Write([]byte("OK"))
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})
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mux.Handle(*metricsPath, promhttp.HandlerFor(r, promhttp.HandlerOpts{
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MaxRequestsInFlight: 1,
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Timeout: time.Minute * 5,
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}))
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server := &http.Server{
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Addr: *listenAddress,
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Handler: mux,
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ReadTimeout: time.Minute,
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ReadHeaderTimeout: time.Minute,
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WriteTimeout: time.Minute,
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IdleTimeout: time.Minute,
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}
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exitSignal := make(chan os.Signal, 1)
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signal.Notify(exitSignal, os.Interrupt)
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go func() {
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log.Printf("Server is starting on %s", *listenAddress)
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err := server.ListenAndServe()
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if err != nil && !errors.Is(err, http.ErrServerClosed) {
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log.Fatalf("Listening to HTTP: %v", err)
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}
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}()
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<-exitSignal
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log.Printf("Recevied exit signal")
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ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
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defer cancel()
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err = server.Shutdown(ctx)
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if err != nil {
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log.Printf("Shutting down server: %v", err)
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}
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}
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