chore(stdiscosrv): use log/slog

Signed-off-by: Jakob Borg <[email protected]>

cmd/stdiscosrv/amqp.go

@@ -10,7 +10,7 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"log"
+	"log/slog"
 
 	amqp "github.com/rabbitmq/amqp091-go"
 	"github.com/thejerf/suture/v4"
@@ -173,7 +173,7 @@ func (s *amqpReceiver) Serve(ctx context.Context) error {
 				id, err = protocol.DeviceIDFromString(string(rec.Key))
 			}
 			if err != nil {
-				log.Println("Replication device ID:", err)
+				slog.Warn("Failed to parse replication device ID", "error", err)
 				replicationRecvsTotal.WithLabelValues("error").Inc()
 				continue
 			}

cmd/stdiscosrv/apisrv.go

@@ -18,6 +18,7 @@ import (
 	"fmt"
 	io "io"
 	"log"
+	"log/slog"
 	"math/rand"
 	"net"
 	"net/http"
@@ -93,7 +94,7 @@ func (s *apiSrv) Serve(ctx context.Context) error {
 	if s.useHTTP {
 		listener, err := net.Listen("tcp", s.addr)
 		if err != nil {
-			log.Println("Listen:", err)
+			slog.ErrorContext(ctx, "Failed to listen", "error", err)
 			return err
 		}
 		s.listener = listener
@@ -107,7 +108,7 @@ func (s *apiSrv) Serve(ctx context.Context) error {
 
 		tlsListener, err := tls.Listen("tcp", s.addr, tlsCfg)
 		if err != nil {
-			log.Println("Listen:", err)
+			slog.ErrorContext(ctx, "Failed to listen", "error", err)
 			return err
 		}
 		s.listener = tlsListener
@@ -132,7 +133,7 @@ func (s *apiSrv) Serve(ctx context.Context) error {
 
 	err := srv.Serve(s.listener)
 	if err != nil {
-		log.Println("Serve:", err)
+		slog.ErrorContext(ctx, "Failed to serve", "error", err)
 	}
 	return err
 }
@@ -151,9 +152,7 @@ func (s *apiSrv) handler(w http.ResponseWriter, req *http.Request) {
 	reqID := requestID(rand.Int63())
 	req = req.WithContext(context.WithValue(req.Context(), idKey, reqID))
 
-	if debug {
-		log.Println(reqID, req.Method, req.URL, req.Proto)
-	}
+	slog.Debug("Handling request", "id", reqID, "method", req.Method, "url", req.URL, "proto", req.Proto)
 
 	remoteAddr := &net.TCPAddr{
 		IP:   nil,
@@ -174,7 +173,7 @@ func (s *apiSrv) handler(w http.ResponseWriter, req *http.Request) {
 		var err error
 		remoteAddr, err = net.ResolveTCPAddr("tcp", req.RemoteAddr)
 		if err != nil {
-			log.Println("remoteAddr:", err)
+			slog.Warn("Failed to resolve remote address", "address", req.RemoteAddr, "error", err)
 			lw.Header().Set("Retry-After", errorRetryAfterString())
 			http.Error(lw, "Internal Server Error", http.StatusInternalServerError)
 			apiRequestsTotal.WithLabelValues("no_remote_addr").Inc()
@@ -197,9 +196,7 @@ func (s *apiSrv) handleGET(w http.ResponseWriter, req *http.Request) {
 
 	deviceID, err := protocol.DeviceIDFromString(req.URL.Query().Get("device"))
 	if err != nil {
-		if debug {
-			log.Println(reqID, "bad device param:", err)
-		}
+		slog.Debug("Request with bad device param", "id", reqID, "error", err)
 		lookupRequestsTotal.WithLabelValues("bad_request").Inc()
 		w.Header().Set("Retry-After", errorRetryAfterString())
 		http.Error(w, "Bad Request", http.StatusBadRequest)
@@ -259,9 +256,7 @@ func (s *apiSrv) handlePOST(remoteAddr *net.TCPAddr, w http.ResponseWriter, req
 
 	rawCert, err := certificateBytes(req)
 	if err != nil {
-		if debug {
-			log.Println(reqID, "no certificates:", err)
-		}
+		slog.Debug("Request without certificates", "id", reqID, "error", err)
 		announceRequestsTotal.WithLabelValues("no_certificate").Inc()
 		w.Header().Set("Retry-After", errorRetryAfterString())
 		http.Error(w, "Forbidden", http.StatusForbidden)
@@ -270,9 +265,7 @@ func (s *apiSrv) handlePOST(remoteAddr *net.TCPAddr, w http.ResponseWriter, req
 
 	var ann announcement
 	if err := json.NewDecoder(req.Body).Decode(&ann); err != nil {
-		if debug {
-			log.Println(reqID, "decode:", err)
-		}
+		slog.Debug("Failed to decode request", "id", reqID, "error", err)
 		announceRequestsTotal.WithLabelValues("bad_request").Inc()
 		w.Header().Set("Retry-After", errorRetryAfterString())
 		http.Error(w, "Bad Request", http.StatusBadRequest)
@@ -283,9 +276,7 @@ func (s *apiSrv) handlePOST(remoteAddr *net.TCPAddr, w http.ResponseWriter, req
 
 	addresses := fixupAddresses(remoteAddr, ann.Addresses)
 	if len(addresses) == 0 {
-		if debug {
-			log.Println(reqID, "no addresses")
-		}
+		slog.Debug("Request without addresses", "id", reqID, "error", err)
 		announceRequestsTotal.WithLabelValues("bad_request").Inc()
 		w.Header().Set("Retry-After", errorRetryAfterString())
 		http.Error(w, "Bad Request", http.StatusBadRequest)
@@ -293,9 +284,7 @@ func (s *apiSrv) handlePOST(remoteAddr *net.TCPAddr, w http.ResponseWriter, req
 	}
 
 	if err := s.handleAnnounce(deviceID, addresses); err != nil {
-		if debug {
-			log.Println(reqID, "handle:", err)
-		}
+		slog.Debug("Failed to handle request", "id", reqID, "error", err)
 		announceRequestsTotal.WithLabelValues("internal_error").Inc()
 		w.Header().Set("Retry-After", errorRetryAfterString())
 		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
@@ -306,9 +295,7 @@ func (s *apiSrv) handlePOST(remoteAddr *net.TCPAddr, w http.ResponseWriter, req
 
 	w.Header().Set("Reannounce-After", reannounceAfterString())
 	w.WriteHeader(http.StatusNoContent)
-	if debug {
-		log.Println(reqID, "announced", deviceID, addresses)
-	}
+	slog.Debug("Device announced", "id", reqID, "device", deviceID, "addresses", addresses)
 }
 
 func (s *apiSrv) Stop() {

cmd/stdiscosrv/database.go

@@ -13,7 +13,7 @@ import (
 	"encoding/binary"
 	"errors"
 	"io"
-	"log"
+	"log/slog"
 	"os"
 	"path"
 	"runtime"
@@ -74,24 +74,24 @@ func newInMemoryStore(dir string, flushInterval time.Duration, blobs blob.Store)
 		// Try to read from blob storage
 		latestKey, cerr := blobs.LatestKey(context.Background())
 		if cerr != nil {
-			log.Println("Error finding database from blob storage:", cerr)
+			slog.Error("Failed to find database in blob storage", "error", cerr)
 			return s
 		}
 		fd, cerr := os.Create(path.Join(s.dir, "records.db"))
 		if cerr != nil {
-			log.Println("Error creating database file:", cerr)
+			slog.Error("Failed to create database file", "error", cerr)
 			return s
 		}
 		if cerr := blobs.Download(context.Background(), latestKey, fd); cerr != nil {
-			log.Printf("Error downloading database from blob storage: %v", cerr)
+			slog.Error("Failed to download database from blob storage", "error", cerr)
 		}
 		_ = fd.Close()
 		nr, err = s.read()
 	}
 	if err != nil {
-		log.Println("Error reading database:", err)
+		slog.Error("Failed to read database", "error", err)
 	}
-	log.Printf("Read %d records from database", nr)
+	slog.Info("Loaded database", "records", nr)
 	s.expireAndCalculateStatistics()
 	return s
 }
@@ -153,13 +153,13 @@ loop:
 	for {
 		select {
 		case <-t.C:
-			log.Println("Calculating statistics")
+			slog.InfoContext(ctx, "Calculating statistics")
 			s.expireAndCalculateStatistics()
-			log.Println("Flushing database")
+			slog.InfoContext(ctx, "Flushing database")
 			if err := s.write(); err != nil {
-				log.Println("Error writing database:", err)
+				slog.ErrorContext(ctx, "Failed to write database", "error", err)
 			}
-			log.Println("Finished flushing database")
+			slog.InfoContext(ctx, "Finished flushing database")
 			t.Reset(s.flushInterval)
 
 		case <-ctx.Done():
@@ -310,18 +310,24 @@ func (s *inMemoryStore) write() (err error) {
 		return err
 	}
 
+	if info, err := os.Lstat(dbf); err == nil {
+		slog.Info("Saved database", "name", dbf, "size", info.Size(), "modtime", info.ModTime())
+	} else {
+		slog.Warn("Failed to stat database after save", "error", err)
+	}
+
 	// Upload to blob storage
 	if s.blobs != nil {
 		fd, err = os.Open(dbf)
 		if err != nil {
-			log.Printf("Error uploading database to blob storage: %v", err)
+			slog.Error("Failed to upload database to blob storage", "error", err)
 			return nil
 		}
 		defer fd.Close()
 		if err := s.blobs.Upload(context.Background(), s.objKey, fd); err != nil {
-			log.Printf("Error uploading database to blob storage: %v", err)
+			slog.Error("Failed to upload database to blob storage", "error", err)
 		}
-		log.Println("Finished uploading database")
+		slog.Info("Finished uploading database")
 	}
 
 	return nil
@@ -360,7 +366,7 @@ func (s *inMemoryStore) read() (int, error) {
 			key, err = protocol.DeviceIDFromString(string(rec.Key))
 		}
 		if err != nil {
-			log.Println("Bad device ID:", err)
+			slog.Error("Got bad device ID while reading database", "error", err)
 			continue
 		}
 

cmd/stdiscosrv/main.go

@@ -9,9 +9,8 @@ package main
 import (
 	"context"
 	"crypto/tls"
-	"log"
+	"log/slog"
 	"net/http"
-	_ "net/http/pprof"
 	"os"
 	"os/signal"
 	"runtime"
@@ -24,6 +23,7 @@ import (
 	"github.com/syncthing/syncthing/internal/blob"
 	"github.com/syncthing/syncthing/internal/blob/azureblob"
 	"github.com/syncthing/syncthing/internal/blob/s3"
+	"github.com/syncthing/syncthing/internal/slogutil"
 	_ "github.com/syncthing/syncthing/lib/automaxprocs"
 	"github.com/syncthing/syncthing/lib/build"
 	"github.com/syncthing/syncthing/lib/protocol"
@@ -32,8 +32,7 @@ import (
 )
 
 const (
-	addressExpiryTime          = 2 * time.Hour
-	databaseStatisticsInterval = 5 * time.Minute
+	addressExpiryTime = 2 * time.Hour
 
 	// Reannounce-After is set to reannounceAfterSeconds +
 	// random(reannounzeFuzzSeconds), similar for Retry-After
@@ -88,13 +87,16 @@ type CLI struct {
 }
 
 func main() {
-	log.SetOutput(os.Stdout)
-
 	var cli CLI
 	kong.Parse(&cli)
-	debug = cli.Debug
 
-	log.Println(build.LongVersionFor("stdiscosrv"))
+	level := slog.LevelInfo
+	if cli.Debug {
+		level = slog.LevelDebug
+	}
+	slogutil.SetDefaultLevel(level)
+
+	slog.Info(build.LongVersionFor("stdiscosrv"))
 	if cli.Version {
 		return
 	}
@@ -106,16 +108,18 @@ func main() {
 		var err error
 		cert, err = tls.LoadX509KeyPair(cli.Cert, cli.Key)
 		if os.IsNotExist(err) {
-			log.Println("Failed to load keypair. Generating one, this might take a while...")
+			slog.Info("Failed to load keypair. Generating one, this might take a while...")
 			cert, err = tlsutil.NewCertificate(cli.Cert, cli.Key, "stdiscosrv", 20*365, false)
 			if err != nil {
-				log.Fatalln("Failed to generate X509 key pair:", err)
+				slog.Error("Failed to generate X509 key pair", "error", err)
+				os.Exit(1)
 			}
 		} else if err != nil {
-			log.Fatalln("Failed to load keypair:", err)
+			slog.Error("Failed to load keypair", "error", err)
+			os.Exit(1)
 		}
 		devID := protocol.NewDeviceID(cert.Certificate[0])
-		log.Println("Server device ID is", devID)
+		slog.Info("Loaded certificate keypair", "deviceID", devID)
 	}
 
 	// Root of the service tree.
@@ -133,7 +137,8 @@ func main() {
 		blobs, err = azureblob.NewBlobStore(cli.DBAzureBlobAccount, cli.DBAzureBlobKey, cli.DBAzureBlobContainer)
 	}
 	if err != nil {
-		log.Fatalf("Failed to create blob store: %v", err)
+		slog.Error("Failed to create blob store", "error", err)
+		os.Exit(1)
 	}
 
 	// Start the database.
@@ -158,7 +163,9 @@ func main() {
 		go func() {
 			mux := http.NewServeMux()
 			mux.Handle("/metrics", promhttp.Handler())
-			log.Fatal(http.ListenAndServe(cli.MetricsListen, mux))
+			err := http.ListenAndServe(cli.MetricsListen, mux)
+			slog.Error("Failed to serve", "error", err)
+			os.Exit(1)
 		}()
 	}
 
@@ -170,7 +177,7 @@ func main() {
 	signal.Notify(signalChan, os.Interrupt)
 	go func() {
 		sig := <-signalChan
-		log.Printf("Received signal %s; shutting down", sig)
+		slog.Info("Received signal; shutting down", "signal", sig)
 		cancel()
 	}()