Improve Scan, Seperate Hashing

server/hash.go

@@ -0,0 +1,62 @@
+package server
+
+import (
+	"context"
+	"crypto/md5"
+	"fmt"
+	"io"
+	"log/slog"
+	"os"
+	"path/filepath"
+	"slices"
+
+	"git.lastassault.de/speatzle/morffix/constants"
+)
+
+func hashFile(ctx context.Context, id uint) error {
+	slog.InfoContext(ctx, "Hashing File", "id", id)
+
+	var filePath string
+	var libraryPath string
+	var oldHash []byte
+	err := db.QueryRow(ctx, "SELECT f.path, l.path, md5 FROM files f INNER JOIN libraries l ON l.id = f.library_id WHERE f.id = $1", id).Scan(&filePath, &libraryPath, &oldHash)
+	if err != nil {
+		return fmt.Errorf("Get File: %w", err)
+	}
+
+	fullPath := filepath.Join(libraryPath, filePath)
+
+	file, err := os.Open(fullPath)
+	if err != nil {
+		return fmt.Errorf("Opening File: %w", err)
+	}
+
+	hash := md5.New()
+	if _, err := io.Copy(hash, file); err != nil {
+		return fmt.Errorf("Reading File: %w", err)
+	}
+	newHash := hash.Sum(nil)
+
+	if slices.Compare[[]byte](newHash, oldHash) != 0 {
+		// File has changed
+		// TODO Queue healthcheck / transcode if enabled
+	}
+
+	tx, err := db.Begin(ctx)
+	if err != nil {
+		return fmt.Errorf("Begin Transaction: %w", err)
+	}
+	defer tx.Rollback(ctx)
+
+	_, err = tx.Exec(ctx, "UPDATE files SET status = $2, md5 = $3 WHERE id = $1", id, constants.FILE_STATUS_EXISTS, newHash)
+	if err != nil {
+		return fmt.Errorf("Updating File in DB: %w", err)
+	}
+
+	err = tx.Commit(ctx)
+	if err != nil {
+		return fmt.Errorf("Committing Changes: %w", err)
+	}
+	slog.InfoContext(ctx, "Hashing File Done", "id", id)
+	return nil
+}