fix: Improve error handling and fix wrong compress dir for windows (#367) (#368)

* fix: Improve error handling and fix wrong compress dir for windows
* refactor: Refactor fileutil package for pass linter

cmd/hack-browser-data/main.go

@@ -62,7 +62,7 @@ func Execute() {
 
 			if compress {
 				if err = fileutil.CompressDir(outputDir); err != nil {
-					slog.Error("compress error: ", "err", err)
+					slog.Error("compress error", "err", err)
 				}
 				slog.Info("compress success")
 			}

utils/fileutil/filetutil.go

@@ -5,7 +5,6 @@ import (
 	"bytes"
 	"fmt"
 	"os"
-	"path"
 	"path/filepath"
 	"strings"
 
@@ -94,40 +93,67 @@ func ParentBaseDir(p string) string {
 func CompressDir(dir string) error {
 	files, err := os.ReadDir(dir)
 	if err != nil {
-		return err
+		return fmt.Errorf("read dir error: %w", err)
 	}
-	b := new(bytes.Buffer)
-	zw := zip.NewWriter(b)
-	for _, f := range files {
-		fw, err := zw.Create(f.Name())
-		if err != nil {
-			return err
-		}
-		name := path.Join(dir, f.Name())
-		content, err := os.ReadFile(name)
-		if err != nil {
-			return err
-		}
-		_, err = fw.Write(content)
-		if err != nil {
-			return err
-		}
-		err = os.Remove(name)
-		if err != nil {
-			return err
+	if len(files) == 0 {
+		// Return an error if no files are found in the directory
+		return fmt.Errorf("no files to compress in: %s", dir)
+	}
+
+	buffer := new(bytes.Buffer)
+	zipWriter := zip.NewWriter(buffer)
+	defer func() {
+		_ = zipWriter.Close()
+	}()
+
+	for _, file := range files {
+		if err := addFileToZip(zipWriter, filepath.Join(dir, file.Name())); err != nil {
+			return fmt.Errorf("failed to add file to zip: %w", err)
 		}
 	}
-	if err := zw.Close(); err != nil {
-		return err
+
+	if err := zipWriter.Close(); err != nil {
+		return fmt.Errorf("error closing zip writer: %w", err)
 	}
-	filename := filepath.Join(dir, fmt.Sprintf("%s.zip", dir))
-	outFile, err := os.Create(filepath.Clean(filename))
-	if err != nil {
-		return err
-	}
-	_, err = b.WriteTo(outFile)
-	if err != nil {
-		return err
-	}
-	return outFile.Close()
+
+	zipFilename := filepath.Join(dir, filepath.Base(dir)+".zip")
+	return writeFile(buffer, zipFilename)
+}
+
+func addFileToZip(zw *zip.Writer, filename string) error {
+	content, err := os.ReadFile(filename)
+	if err != nil {
+		return fmt.Errorf("error reading file %s: %w", filename, err)
+	}
+
+	fw, err := zw.Create(filepath.Base(filename))
+	if err != nil {
+		return fmt.Errorf("error creating zip entry for %s: %w", filename, err)
+	}
+
+	if _, err = fw.Write(content); err != nil {
+		return fmt.Errorf("error writing content to zip for %s: %w", filename, err)
+	}
+
+	if err = os.Remove(filename); err != nil {
+		return fmt.Errorf("error removing original file %s: %w", filename, err)
+	}
+
+	return nil
+}
+
+func writeFile(buffer *bytes.Buffer, filename string) error {
+	outFile, err := os.Create(filename)
+	if err != nil {
+		return fmt.Errorf("error creating output file %s: %w", filename, err)
+	}
+	defer func() {
+		_ = outFile.Close()
+	}()
+
+	if _, err = buffer.WriteTo(outFile); err != nil {
+		return fmt.Errorf("error writing data to file %s: %w", filename, err)
+	}
+
+	return nil
 }

utils/fileutil/fileutil_test.go

@@ -0,0 +1,52 @@
+package fileutil
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func setupTestDir(t *testing.T, files []string) string {
+	t.Helper() // Marks the function as a helper function.
+
+	tempDir, err := os.MkdirTemp("", "testCompressDir")
+	require.NoError(t, err, "failed to create a temporary directory")
+
+	for _, file := range files {
+		filePath := filepath.Join(tempDir, file)
+		err := os.WriteFile(filePath, []byte("test content"), 0o644)
+		require.NoError(t, err, "failed to create a test file")
+	}
+	return tempDir
+}
+
+func TestCompressDir(t *testing.T) {
+	t.Run("Normal Operation", func(t *testing.T) {
+		tempDir := setupTestDir(t, []string{"file1.txt", "file2.txt", "file3.txt"})
+		defer os.RemoveAll(tempDir)
+
+		err := CompressDir(tempDir)
+		assert.NoError(t, err, "compressDir should not return an error")
+
+		// Check if the zip file exists
+		zipFile := filepath.Join(tempDir, filepath.Base(tempDir)+".zip")
+		assert.FileExists(t, zipFile, "zip file should be created")
+	})
+
+	t.Run("Directory Does Not Exist", func(t *testing.T) {
+		err := CompressDir("/path/to/nonexistent/directory")
+		assert.Error(t, err, "should return an error for non-existent directory")
+	})
+
+	t.Run("Empty Directory", func(t *testing.T) {
+		tempDir, err := os.MkdirTemp("", "testEmptyDir")
+		require.NoError(t, err, "failed to create empty test directory")
+		defer os.RemoveAll(tempDir)
+
+		err = CompressDir(tempDir)
+		assert.Error(t, err, "should return an error for an empty directory")
+	})
+}