serve

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Variables

var Command = &cli.Command{
	Name:  "serve",
	Usage: "Launch a http server that serves queries in prometheus format",
	Flags: []cli.Flag{
		&cli.StringFlag{
			Name:  "listen-addr",
			Usage: "server listen `HOST:ADDR`",
			Value: ":16480",
		},
	},
	Action: func(c *cli.Context) error {
		mux := http.NewServeMux()

		fetcher := fetch.NewCachedFetcher(fetch.Direct{})
		mux.Handle("/probe", exporter.Handler{Fetcher: fetcher})

		prometheus.MustRegister(prometheus.NewBuildInfoCollector())
		mux.Handle("/metrics", promhttp.Handler())

		mux.HandleFunc("/healthz", func(w http.ResponseWriter, req *http.Request) {
			w.Header().Set("content-type", "text/plain")
			if _, err := w.Write([]byte("ok\n")); err != nil {
				zap.S().Warnf("Failed to write ok: %v", err)
			}
		})

		mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
			w.Header().Set("content-type", "text/html; charset=UTF-8")
			if _, err := w.Write(indexhtml); err != nil {
				zap.S().Warnf("Failed to write index.html: %v", err)

			}
		})

		listenAddr := c.String("listen-addr")
		zap.S().Infof("About to start listening on %s", listenAddr)
		if err := http.ListenAndServe(listenAddr, mux); err != nil {
			return err
		}

		return nil
	},
}