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main.go
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main.go
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package main
import (
"context"
"encoding/json"
"fmt"
"net/http"
"os"
"os/signal"
"syscall"
"time"
"github.com/exzz/netatmo-api-go"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/sirupsen/logrus"
"github.com/spf13/pflag"
"golang.org/x/oauth2"
"github.com/xperimental/netatmo-exporter/v2/internal/collector"
"github.com/xperimental/netatmo-exporter/v2/internal/config"
"github.com/xperimental/netatmo-exporter/v2/internal/logger"
"github.com/xperimental/netatmo-exporter/v2/internal/token"
"github.com/xperimental/netatmo-exporter/v2/internal/web"
)
var (
signals = []os.Signal{
syscall.SIGINT,
syscall.SIGTERM,
}
log = logger.NewLogger()
)
func main() {
cfg, err := config.Parse(os.Args, os.Getenv)
switch {
case err == pflag.ErrHelp:
return
case err != nil:
log.Fatalf("Error in configuration: %s", err)
default:
}
log.SetLevel(logrus.Level(cfg.LogLevel))
log.Infof("netatmo-exporter %s (commit: %s)", Version, GitCommit)
client := netatmo.NewClient(cfg.Netatmo)
if cfg.TokenFile != "" {
token, err := loadToken(cfg.TokenFile)
switch {
case os.IsNotExist(err):
case err != nil:
log.Fatalf("Error loading token: %s", err)
case !token.Expiry.IsZero() && token.Expiry.Before(time.Now()):
log.Warn("Restored token has expired! Token has been ignored.")
default:
if token.RefreshToken == "" {
log.Warn("Restored token has no refresh-token! Exporter will need to be re-authenticated manually.")
} else if token.Expiry.IsZero() {
log.Warn("Restored token has no expiry time! Token will be renewed immediately.")
token.Expiry = time.Now().Add(time.Second)
}
log.Infof("Loaded token from %s.", cfg.TokenFile)
client.InitWithToken(context.Background(), token)
}
registerSignalHandler(client, cfg.TokenFile)
} else {
log.Warn("No token-file set! Authentication will be lost on restart.")
}
metrics := collector.New(log, client.Read, cfg.RefreshInterval, cfg.StaleDuration)
prometheus.MustRegister(metrics)
tokenMetric := token.Metric(client.CurrentToken)
prometheus.MustRegister(tokenMetric)
if cfg.DebugHandlers {
http.Handle("/debug/data", web.DebugDataHandler(log, client.Read))
http.Handle("/debug/token", web.DebugTokenHandler(log, client.CurrentToken))
}
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
http.Handle("/auth/authorize", web.AuthorizeHandler(cfg.ExternalURL, client))
http.Handle("/auth/callback", web.CallbackHandler(ctx, client))
http.Handle("/auth/settoken", web.SetTokenHandler(ctx, client))
http.Handle("/metrics", promhttp.HandlerFor(prometheus.DefaultGatherer, promhttp.HandlerOpts{}))
http.Handle("/version", versionHandler(log))
http.Handle("/", web.HomeHandler(client.CurrentToken))
log.Infof("Listen on %s...", cfg.Addr)
log.Fatal(http.ListenAndServe(cfg.Addr, nil))
}
func loadToken(fileName string) (*oauth2.Token, error) {
file, err := os.Open(fileName)
if err != nil {
return nil, err
}
defer file.Close()
var token oauth2.Token
if err := json.NewDecoder(file).Decode(&token); err != nil {
return nil, err
}
return &token, nil
}
func registerSignalHandler(client *netatmo.Client, fileName string) {
ch := make(chan os.Signal, 1)
signal.Notify(ch, signals...)
go func() {
sig := <-ch
signal.Reset(signals...)
log.Debugf("Got signal: %s", sig)
if err := saveToken(client, fileName); err != nil {
log.Errorf("Error persisting token: %s", err)
}
os.Exit(0)
}()
}
func saveToken(client *netatmo.Client, fileName string) error {
token, err := client.CurrentToken()
switch {
case err == netatmo.ErrNotAuthenticated:
return nil
case err != nil:
return fmt.Errorf("error retrieving token: %w", err)
default:
}
log.Infof("Saving token to %s ...", fileName)
data, err := json.Marshal(token)
if err != nil {
return fmt.Errorf("error marshalling token: %w", err)
}
if err := os.WriteFile(fileName, data, 0o600); err != nil {
return fmt.Errorf("error writing token file: %w", err)
}
return nil
}