.isrc db

app.go

@@ -46,10 +46,14 @@ func (a *App) startup(ctx context.Context) {
 	if err := backend.InitHistoryDB("SpotiFLAC"); err != nil {
 		fmt.Printf("Failed to init history DB: %v\n", err)
 	}
+	if err := backend.InitISRCCacheDB(); err != nil {
+		fmt.Printf("Failed to init ISRC cache DB: %v\n", err)
+	}
 }
 
 func (a *App) shutdown(ctx context.Context) {
 	backend.CloseHistoryDB()
+	backend.CloseISRCCacheDB()
 }
 
 type SpotifyMetadataRequest struct {
@@ -629,12 +633,8 @@ func (a *App) OpenFolder(path string) error {
 }
 
 func (a *App) OpenConfigFolder() error {
-	homeDir, err := os.UserHomeDir()
+	configDir, err := backend.EnsureAppDir()
 	if err != nil {
-		return fmt.Errorf("failed to get home directory: %v", err)
-	}
-	configDir := filepath.Join(homeDir, ".spotiflac")
-	if err := os.MkdirAll(configDir, 0755); err != nil {
 		return fmt.Errorf("failed to create config directory: %v", err)
 	}
 	return backend.OpenFolderInExplorer(configDir)

backend/ffmpeg.go

@@ -58,7 +58,7 @@ func ValidateExecutable(path string) error {
 	return nil
 }
 
-func GetFFmpegDir() (string, error) {
+func GetAppDir() (string, error) {
 	homeDir, err := os.UserHomeDir()
 	if err != nil {
 		return "", fmt.Errorf("failed to get home directory: %w", err)
@@ -66,6 +66,23 @@ func GetFFmpegDir() (string, error) {
 	return filepath.Join(homeDir, ".spotiflac"), nil
 }
 
+func EnsureAppDir() (string, error) {
+	appDir, err := GetAppDir()
+	if err != nil {
+		return "", err
+	}
+
+	if err := os.MkdirAll(appDir, 0o755); err != nil {
+		return "", fmt.Errorf("failed to create app directory: %w", err)
+	}
+
+	return appDir, nil
+}
+
+func GetFFmpegDir() (string, error) {
+	return EnsureAppDir()
+}
+
 func GetFFmpegPath() (string, error) {
 	ffmpegDir, err := GetFFmpegDir()
 	if err != nil {

backend/history.go

@@ -3,7 +3,6 @@ package backend
 import (
 	"encoding/json"
 	"fmt"
-	"os"
 	"path/filepath"
 	"sort"
 	"time"
@@ -35,13 +34,10 @@ const (
 
 func InitHistoryDB(appName string) error {
 
-	appDir, err := GetFFmpegDir()
+	appDir, err := EnsureAppDir()
 	if err != nil {
 		return err
 	}
-	if _, err := os.Stat(appDir); os.IsNotExist(err) {
-		os.MkdirAll(appDir, 0755)
-	}
 	dbPath := filepath.Join(appDir, "history.db")
 
 	db, err := bolt.Open(dbPath, 0600, &bolt.Options{Timeout: 1 * time.Second})

backend/isrc_cache.go

@@ -0,0 +1,137 @@
+package backend
+
+import (
+	"encoding/json"
+	"fmt"
+	"path/filepath"
+	"strings"
+	"sync"
+	"time"
+
+	bolt "go.etcd.io/bbolt"
+)
+
+const (
+	isrcCacheDBFile = "isrc_cache.db"
+	isrcCacheBucket = "SpotifyTrackISRC"
+)
+
+type isrcCacheEntry struct {
+	TrackID   string `json:"track_id"`
+	ISRC      string `json:"isrc"`
+	UpdatedAt int64  `json:"updated_at"`
+}
+
+var (
+	isrcCacheDB   *bolt.DB
+	isrcCacheDBMu sync.Mutex
+)
+
+func InitISRCCacheDB() error {
+	isrcCacheDBMu.Lock()
+	defer isrcCacheDBMu.Unlock()
+
+	if isrcCacheDB != nil {
+		return nil
+	}
+
+	appDir, err := EnsureAppDir()
+	if err != nil {
+		return err
+	}
+
+	dbPath := filepath.Join(appDir, isrcCacheDBFile)
+	db, err := bolt.Open(dbPath, 0o600, &bolt.Options{Timeout: 1 * time.Second})
+	if err != nil {
+		return err
+	}
+
+	if err := db.Update(func(tx *bolt.Tx) error {
+		_, err := tx.CreateBucketIfNotExists([]byte(isrcCacheBucket))
+		return err
+	}); err != nil {
+		db.Close()
+		return err
+	}
+
+	isrcCacheDB = db
+	return nil
+}
+
+func CloseISRCCacheDB() {
+	isrcCacheDBMu.Lock()
+	defer isrcCacheDBMu.Unlock()
+
+	if isrcCacheDB != nil {
+		_ = isrcCacheDB.Close()
+		isrcCacheDB = nil
+	}
+}
+
+func GetCachedISRC(trackID string) (string, error) {
+	normalizedTrackID := strings.TrimSpace(trackID)
+	if normalizedTrackID == "" {
+		return "", nil
+	}
+
+	if err := InitISRCCacheDB(); err != nil {
+		return "", err
+	}
+
+	var cachedISRC string
+	err := isrcCacheDB.View(func(tx *bolt.Tx) error {
+		bucket := tx.Bucket([]byte(isrcCacheBucket))
+		if bucket == nil {
+			return nil
+		}
+
+		value := bucket.Get([]byte(normalizedTrackID))
+		if len(value) == 0 {
+			return nil
+		}
+
+		var entry isrcCacheEntry
+		if err := json.Unmarshal(value, &entry); err != nil {
+			return err
+		}
+
+		cachedISRC = strings.ToUpper(strings.TrimSpace(entry.ISRC))
+		return nil
+	})
+	if err != nil {
+		return "", err
+	}
+
+	return cachedISRC, nil
+}
+
+func PutCachedISRC(trackID string, isrc string) error {
+	normalizedTrackID := strings.TrimSpace(trackID)
+	normalizedISRC := strings.ToUpper(strings.TrimSpace(isrc))
+	if normalizedTrackID == "" || normalizedISRC == "" {
+		return nil
+	}
+
+	if err := InitISRCCacheDB(); err != nil {
+		return err
+	}
+
+	entry := isrcCacheEntry{
+		TrackID:   normalizedTrackID,
+		ISRC:      normalizedISRC,
+		UpdatedAt: time.Now().Unix(),
+	}
+
+	payload, err := json.Marshal(entry)
+	if err != nil {
+		return fmt.Errorf("failed to encode ISRC cache entry: %w", err)
+	}
+
+	return isrcCacheDB.Update(func(tx *bolt.Tx) error {
+		bucket, err := tx.CreateBucketIfNotExists([]byte(isrcCacheBucket))
+		if err != nil {
+			return err
+		}
+		return bucket.Put([]byte(normalizedTrackID), payload)
+	})
+}

backend/isrc_finder.go

@@ -54,6 +54,14 @@ func (s *SongLinkClient) lookupSpotifyISRC(spotifyTrackID string) (string, error
 		return "", err
 	}
 
+	cachedISRC, err := GetCachedISRC(normalizedTrackID)
+	if err != nil {
+		fmt.Printf("Warning: failed to read ISRC cache: %v\n", err)
+	} else if cachedISRC != "" {
+		fmt.Printf("Found ISRC in cache: %s\n", cachedISRC)
+		return cachedISRC, nil
+	}
+
 	payload, err := fetchSpotifyTrackRawData(s.client, normalizedTrackID)
 	if err != nil {
 		return "", err
@@ -65,6 +73,9 @@ func (s *SongLinkClient) lookupSpotifyISRC(spotifyTrackID string) (string, error
 	}
 
 	fmt.Printf("Found ISRC via Spotify metadata: %s\n", isrc)
+	if err := PutCachedISRC(normalizedTrackID, isrc); err != nil {
+		fmt.Printf("Warning: failed to write ISRC cache: %v\n", err)
+	}
 	return isrc, nil
 }
 
@@ -158,17 +169,12 @@ func saveSpotifyCachedToken(token *spotifyAnonymousToken) error {
 }
 
 func spotifyTokenCachePath() (string, error) {
-	cacheDir, err := os.UserCacheDir()
+	appDir, err := EnsureAppDir()
-	if err == nil && cacheDir != "" {
-		return filepath.Join(cacheDir, "SpotiFLAC", spotifyTokenCacheFile), nil
-	}
-
-	wd, err := os.Getwd()
 	if err != nil {
-		return "", fmt.Errorf("failed to determine working directory: %w", err)
+		return "", err
 	}
 
-	return filepath.Join(wd, spotifyTokenCacheFile), nil
+	return filepath.Join(appDir, spotifyTokenCacheFile), nil
 }
 
 func spotifyTokenIsValid(token *spotifyAnonymousToken) bool {