🚚 Move io related functions to fs internal package

pkg/internal/fs/merger.go

@@ -0,0 +1,72 @@
+package fs
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+
+	"git.solsynth.dev/hypernet/paperclip/pkg/internal/database"
+	"git.solsynth.dev/hypernet/paperclip/pkg/internal/models"
+	"github.com/spf13/viper"
+)
+
+func MergeFileChunks(meta models.AttachmentFragment, arrange []string) (models.Attachment, error) {
+	attachment := meta.ToAttachment()
+
+	// Fetch destination from config
+	destMap := viper.GetStringMapString("destinations.0")
+
+	var dest models.LocalDestination
+	dest.Path = destMap["path"]
+
+	// Create the destination file
+	destPath := filepath.Join(dest.Path, meta.Uuid)
+	destFile, err := os.Create(destPath)
+	if err != nil {
+		return attachment, err
+	}
+	defer destFile.Close()
+
+	// 32KB buffer
+	buf := make([]byte, 32*1024)
+
+	// Merge the chunks into the destination file
+	for _, chunk := range arrange {
+		chunkPath := filepath.Join(dest.Path, fmt.Sprintf("%s.part%s", meta.Uuid, chunk))
+		chunkFile, err := os.Open(chunkPath)
+		if err != nil {
+			return attachment, err
+		}
+
+		defer chunkFile.Close() // Ensure the file is closed after reading
+
+		for {
+			n, err := chunkFile.Read(buf)
+			if err != nil && err != io.EOF {
+				return attachment, err
+			}
+			if n == 0 {
+				break
+			}
+
+			if _, err := destFile.Write(buf[:n]); err != nil {
+				return attachment, err
+			}
+		}
+	}
+
+	// Clean up: remove chunk files
+	go DeleteFragment(meta)
+	for _, chunk := range arrange {
+		chunkPath := filepath.Join(dest.Path, fmt.Sprintf("%s.part%s", meta.Uuid, chunk))
+		if err := os.Remove(chunkPath); err != nil {
+			return attachment, err
+		}
+	}
+
+	// Clean up: remove fragment record
+	database.C.Delete(&meta)
+
+	return attachment, nil
+}