优化结构

internal/integration/storage/compose.go

@@ -1,56 +0,0 @@
-package storage
-
-import (
-	"context"
-	"crypto/md5"
-	"encoding/hex"
-	"io"
-)
-
-// composeStreams concatenates objects into destination while calculating the
-// MD5 of the exact bytes written. Provider-specific storage clients stay out
-// of this package; callbacks keep this helper independent from biz and SDKs.
-func composeStreams(
-	ctx context.Context,
-	names []string,
-	open func(context.Context, string) (io.ReadCloser, error),
-	put func(context.Context, string, io.Reader) error,
-	remove func(context.Context, string) error,
-	destination string,
-) (string, error) {
-	reader, writer := io.Pipe()
-	hash := md5.New()
-	errCh := make(chan error, 1)
-	go func() {
-		defer writer.Close()
-		for _, name := range names {
-			if err := ctx.Err(); err != nil {
-				errCh <- err
-				return
-			}
-			file, err := open(ctx, name)
-			if err != nil {
-				errCh <- err
-				return
-			}
-			_, copyErr := io.Copy(io.MultiWriter(writer, hash), file)
-			_ = file.Close()
-			if copyErr != nil {
-				errCh <- copyErr
-				return
-			}
-		}
-		errCh <- nil
-	}()
-	putErr := put(ctx, destination, reader)
-	composeErr := <-errCh
-	if putErr != nil {
-		_ = remove(ctx, destination)
-		return "", putErr
-	}
-	if composeErr != nil {
-		_ = remove(ctx, destination)
-		return "", composeErr
-	}
-	return hex.EncodeToString(hash.Sum(nil)), nil
-}