mirror of
https://github.com/Luzifer/mercedes-byocar-exporter.git
synced 2024-11-08 14:00:09 +00:00
99 lines
2.7 KiB
Go
99 lines
2.7 KiB
Go
package main
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import (
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"fmt"
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"net/http"
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"os"
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"time"
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"github.com/pkg/errors"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"github.com/robfig/cron/v3"
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"github.com/sirupsen/logrus"
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"github.com/Luzifer/mercedes-byocar-exporter/internal/credential"
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"github.com/Luzifer/mercedes-byocar-exporter/internal/mercedes"
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"github.com/Luzifer/rconfig/v2"
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)
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var (
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cfg cliConfig
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version = "dev"
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)
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func initApp() error {
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rconfig.AutoEnv(true)
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if err := rconfig.ParseAndValidate(&cfg); err != nil {
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return errors.Wrap(err, "parsing cli options")
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}
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if cfg.VersionAndExit {
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fmt.Printf("mercedes-byocar-exporter %s\n", version)
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os.Exit(0)
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}
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l, err := logrus.ParseLevel(cfg.LogLevel)
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if err != nil {
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return errors.Wrap(err, "parsing log-level")
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}
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logrus.SetLevel(l)
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if err = cfg.Validate(); err != nil {
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return errors.Wrap(err, "validating config")
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}
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return nil
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}
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func main() {
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var err error
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if err = initApp(); err != nil {
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logrus.WithError(err).Fatal("initializing app")
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}
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// Initialize credentials store
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var creds credential.Store
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switch {
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case cfg.ClientID != "":
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logrus.WithField("method", "json-file").Debug("opening credential store")
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creds, err = credential.NewJSONStore(cfg.CredentialFile, cfg.ClientID, cfg.ClientSecret)
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case cfg.VaultKey != "":
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logrus.WithField("method", "vault").Debug("opening credential store")
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creds, err = credential.NewVaultStore(cfg.VaultKey)
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}
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if err != nil {
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logrus.WithError(err).Fatal("initializing credential store")
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}
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logrus.WithField("method", "vault").Debug("credential store connected")
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// Initialize Mercedes API client
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clientID, clientSecret, err := creds.GetClientCredentials()
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if err != nil {
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logrus.WithError(err).Fatal("getting client credentials")
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}
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mClient := mercedes.New(clientID, clientSecret, creds)
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// Register HTTP handlers
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http.DefaultServeMux.HandleFunc("/auth", getAuthRedirectHandler(mClient))
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http.DefaultServeMux.HandleFunc("/store-token", getAuthStoreTokenHandler(mClient, creds))
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http.DefaultServeMux.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) { w.Write([]byte("OK")) })
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http.DefaultServeMux.Handle("/metrics", promhttp.Handler())
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scheduler := cron.New()
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scheduler.AddFunc(fmt.Sprintf("@every %s", cfg.FetchInterval), getCronFunc(mClient))
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scheduler.Start()
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// Do an initial fetch to propagate metrics
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getCronFunc(mClient)()
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// Start HTTP server
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logrus.WithField("version", version).Info("mercedes-byocar-exporter started")
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srv := http.Server{
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Addr: cfg.Listen,
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Handler: http.DefaultServeMux,
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ReadHeaderTimeout: time.Second,
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}
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if err = srv.ListenAndServe(); err != nil {
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logrus.WithError(err).Fatal("HTTP server exitted unexpectedly")
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}
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}
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