Fix all `errcheck` warnings

engine/cover.go

@@ -74,7 +74,9 @@ func (c *cover) Get(ctx context.Context, id string, size int, out io.Writer) err
 				log.Error(ctx, "Error loading cover art", "path", path, "size", size, err)
 				return
 			}
-			io.Copy(w, reader)
+			if _, err := io.Copy(w, reader); err != nil {
+				log.Error(ctx, "Error saving covert art to cache", "path", path, "size", size, err)
+			}
 		}()
 	} else {
 		log.Trace(ctx, "Loading image from cache", "path", path, "size", size, "lastUpdate", lastUpdate)

engine/nowplaying.go

@@ -110,7 +110,7 @@ func checkExpired(l *list.List, f func() *list.Element) *list.Element {
 			return nil
 		}
 		start := e.Value.(*NowPlayingInfo).Start
-		if time.Now().Sub(start) < NowPlayingExpire {
+		if time.Since(start) < NowPlayingExpire {
 			return e
 		}
 		l.Remove(e)

engine/scrobbler.go

@@ -2,7 +2,6 @@ package engine
 
 import (
 	"context"
-	"errors"
 	"fmt"
 	"time"
 
@@ -57,7 +56,7 @@ func (s *scrobbler) NowPlaying(ctx context.Context, playerId int, playerName, tr
 	}
 
 	if mf == nil {
-		return nil, errors.New(fmt.Sprintf(`ID "%s" not found`, trackId))
+		return nil, fmt.Errorf(`ID "%s" not found`, trackId)
 	}
 
 	log.Info("Now Playing", "title", mf.Title, "artist", mf.Artist, "user", userName(ctx))

engine/transcoder/ffmpeg.go

@@ -38,7 +38,9 @@ func (ff *ffmpeg) Start(ctx context.Context, command, path string, maxBitRate in
 	if err = cmd.Start(); err != nil {
 		return
 	}
-	go cmd.Wait() // prevent zombies
+
+	go func() { _ = cmd.Wait() }() // prevent zombies
+
 	return
 }
 

persistence/persistence_suite_test.go

@@ -22,7 +22,7 @@ func TestPersistence(t *testing.T) {
 	//os.Remove("./test-123.db")
 	//conf.Server.Path = "./test-123.db"
 	conf.Server.DbPath = "file::memory:?cache=shared"
-	orm.RegisterDataBase("default", db.Driver, conf.Server.DbPath)
+	_ = orm.RegisterDataBase("default", db.Driver, conf.Server.DbPath)
 	db.EnsureLatestVersion()
 	log.SetLevel(log.LevelCritical)
 	RegisterFailHandler(Fail)

scanner/change_detector_test.go

@@ -103,8 +103,8 @@ var _ = Describe("ChangeDetector", func() {
 		Expect(changed).To(BeEmpty())
 		Expect(changed).To(BeEmpty())
 
-		f, err := os.Create(filepath.Join(testFolder, "a", "b", "new.txt"))
+		f, _ := os.Create(filepath.Join(testFolder, "a", "b", "new.txt"))
-		f.Close()
+		_ = f.Close()
 		changed, deleted, err = newScanner.Scan(lastModifiedSince)
 		Expect(err).To(BeNil())
 		Expect(deleted).To(BeEmpty())

scanner/scanner.go

@@ -72,7 +72,9 @@ func (s *Scanner) getLastModifiedSince(folder string) time.Time {
 
 func (s *Scanner) updateLastModifiedSince(folder string, t time.Time) {
 	millis := t.UnixNano() / int64(time.Millisecond)
-	s.ds.Property(nil).Put(model.PropLastScan+"-"+folder, fmt.Sprint(millis))
+	if err := s.ds.Property(context.TODO()).Put(model.PropLastScan+"-"+folder, fmt.Sprint(millis)); err != nil {
+		log.Error("Error updating DB after scan", err)
+	}
 }
 
 func (s *Scanner) loadFolders() {
@@ -85,12 +87,6 @@ func (s *Scanner) loadFolders() {
 
 type Status int
 
-const (
-	StatusComplete Status = iota
-	StatusInProgress
-	StatusError
-)
-
 type StatusInfo struct {
 	MediaFolder string
 	Status      Status

server/app/app.go

@@ -49,7 +49,7 @@ func (app *Router) routes(path string) http.Handler {
 		app.R(r, "/player", model.Player{})
 
 		// Keepalive endpoint to be used to keep the session valid (ex: while playing songs)
-		r.Get("/keepalive/*", func(w http.ResponseWriter, r *http.Request) { w.Write([]byte(`{"response":"ok"}`)) })
+		r.Get("/keepalive/*", func(w http.ResponseWriter, r *http.Request) { _, _ = w.Write([]byte(`{"response":"ok"}`)) })
 	})
 
 	// Serve UI app assets

server/app/auth.go

@@ -6,7 +6,6 @@ import (
 	"errors"
 	"net/http"
 	"strings"
-	"sync"
 	"time"
 
 	"github.com/deluan/navidrome/consts"
@@ -20,7 +19,6 @@ import (
 )
 
 var (
-	once         sync.Once
 	ErrFirstTime = errors.New("no users created")
 )
 
@@ -31,7 +29,7 @@ func Login(ds model.DataStore) func(w http.ResponseWriter, r *http.Request) {
 		username, password, err := getCredentialsFromBody(r)
 		if err != nil {
 			log.Error(r, "Parsing request body", err)
-			rest.RespondWithError(w, http.StatusUnprocessableEntity, err.Error())
+			_ = rest.RespondWithError(w, http.StatusUnprocessableEntity, err.Error())
 			return
 		}
 
@@ -42,21 +40,21 @@ func Login(ds model.DataStore) func(w http.ResponseWriter, r *http.Request) {
 func handleLogin(ds model.DataStore, username string, password string, w http.ResponseWriter, r *http.Request) {
 	user, err := validateLogin(ds.User(r.Context()), username, password)
 	if err != nil {
-		rest.RespondWithError(w, http.StatusInternalServerError, "Unknown error authentication user. Please try again")
+		_ = rest.RespondWithError(w, http.StatusInternalServerError, "Unknown error authentication user. Please try again")
 		return
 	}
 	if user == nil {
 		log.Warn(r, "Unsuccessful login", "username", username, "request", r.Header)
-		rest.RespondWithError(w, http.StatusUnauthorized, "Invalid username or password")
+		_ = rest.RespondWithError(w, http.StatusUnauthorized, "Invalid username or password")
 		return
 	}
 
 	tokenString, err := auth.CreateToken(user)
 	if err != nil {
-		rest.RespondWithError(w, http.StatusInternalServerError, "Unknown error authenticating user. Please try again")
+		_ = rest.RespondWithError(w, http.StatusInternalServerError, "Unknown error authenticating user. Please try again")
 		return
 	}
-	rest.RespondWithJSON(w, http.StatusOK,
+	_ = rest.RespondWithJSON(w, http.StatusOK,
 		map[string]interface{}{
 			"message":  "User '" + username + "' authenticated successfully",
 			"token":    tokenString,
@@ -71,7 +69,7 @@ func getCredentialsFromBody(r *http.Request) (username string, password string,
 	decoder := json.NewDecoder(r.Body)
 	if err = decoder.Decode(&data); err != nil {
 		log.Error(r, "parsing request body", err)
-		err = errors.New("Invalid request payload")
+		err = errors.New("invalid request payload")
 		return
 	}
 	username = data["username"]
@@ -86,21 +84,21 @@ func CreateAdmin(ds model.DataStore) func(w http.ResponseWriter, r *http.Request
 		username, password, err := getCredentialsFromBody(r)
 		if err != nil {
 			log.Error(r, "parsing request body", err)
-			rest.RespondWithError(w, http.StatusUnprocessableEntity, err.Error())
+			_ = rest.RespondWithError(w, http.StatusUnprocessableEntity, err.Error())
 			return
 		}
 		c, err := ds.User(r.Context()).CountAll()
 		if err != nil {
-			rest.RespondWithError(w, http.StatusInternalServerError, err.Error())
+			_ = rest.RespondWithError(w, http.StatusInternalServerError, err.Error())
 			return
 		}
 		if c > 0 {
-			rest.RespondWithError(w, http.StatusForbidden, "Cannot create another first admin")
+			_ = rest.RespondWithError(w, http.StatusForbidden, "Cannot create another first admin")
 			return
 		}
 		err = createDefaultUser(r.Context(), ds, username, password)
 		if err != nil {
-			rest.RespondWithError(w, http.StatusInternalServerError, err.Error())
+			_ = rest.RespondWithError(w, http.StatusInternalServerError, err.Error())
 			return
 		}
 		handleLogin(ds, username, password, w, r)
@@ -186,11 +184,11 @@ func authenticator(ds model.DataStore) func(next http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 			token, err := getToken(ds, r.Context())
 			if err == ErrFirstTime {
-				rest.RespondWithJSON(w, http.StatusUnauthorized, map[string]string{"message": ErrFirstTime.Error()})
+				_ = rest.RespondWithJSON(w, http.StatusUnauthorized, map[string]string{"message": ErrFirstTime.Error()})
 				return
 			}
 			if err != nil {
-				rest.RespondWithError(w, http.StatusUnauthorized, "Not authenticated")
+				_ = rest.RespondWithError(w, http.StatusUnauthorized, "Not authenticated")
 				return
 			}
 
@@ -200,7 +198,7 @@ func authenticator(ds model.DataStore) func(next http.Handler) http.Handler {
 			newTokenString, err := auth.TouchToken(token)
 			if err != nil {
 				log.Error(r, "signing new token", err)
-				rest.RespondWithError(w, http.StatusUnauthorized, "Not authenticated")
+				_ = rest.RespondWithError(w, http.StatusUnauthorized, "Not authenticated")
 				return
 			}
 

server/subsonic/api.go

@@ -162,7 +162,7 @@ func H(r chi.Router, path string, f Handler) {
 func HGone(r chi.Router, path string) {
 	handle := func(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(410)
-		w.Write([]byte("This endpoint will not be implemented"))
+		_, _ = w.Write([]byte("This endpoint will not be implemented"))
 	}
 	r.HandleFunc("/"+path, handle)
 	r.HandleFunc("/"+path+".view", handle)
@@ -207,5 +207,7 @@ func SendResponse(w http.ResponseWriter, r *http.Request, payload *responses.Sub
 	} else {
 		log.Warn(r.Context(), "API: Failed response", "error", payload.Error.Code, "message", payload.Error.Message)
 	}
-	w.Write(response)
+	if _, err := w.Write(response); err != nil {
+		log.Error(r, "Error sending response to client", "payload", string(response), err)
+	}
 }

server/subsonic/media_retrieval.go

@@ -27,7 +27,7 @@ func (c *MediaRetrievalController) GetAvatar(w http.ResponseWriter, r *http.Requ
 		return nil, NewError(responses.ErrorDataNotFound, "Avatar image not found")
 	}
 	defer f.Close()
-	io.Copy(w, f)
+	_, _ = io.Copy(w, f)
 
 	return nil, nil
 }

server/subsonic/media_retrieval_test.go

@@ -24,8 +24,8 @@ func (c *fakeCover) Get(ctx context.Context, id string, size int, out io.Writer)
 	}
 	c.recvId = id
 	c.recvSize = size
-	out.Write([]byte(c.data))
+	_, err := out.Write([]byte(c.data))
-	return nil
+	return err
 }
 
 var _ = Describe("MediaRetrievalController", func() {

tests/init_tests.go

@@ -22,7 +22,7 @@ func Init(t *testing.T, skipOnShort bool) {
 		appPath, _ := filepath.Abs(filepath.Join(filepath.Dir(file), ".."))
 		confPath, _ := filepath.Abs(filepath.Join(appPath, "tests", "navidrome-test.toml"))
 		println("Loading test configuration file from " + confPath)
-		os.Chdir(appPath)
+		_ = os.Chdir(appPath)
 		conf.LoadFromFile("tests/navidrome-test.toml", true)
 
 		noLog := os.Getenv("NOLOG")

utils/request_helpers.go

@@ -68,5 +68,5 @@ func ParamBool(r *http.Request, param string, def bool) bool {
 	if p == "" {
 		return def
 	}
-	return strings.Index("/true/on/1/", "/"+p+"/") != -1
+	return strings.Contains("/true/on/1/", "/"+p+"/")
 }