split deleteFiles into UI and logic parts

cmd/restic/delete.go

@@ -3,9 +3,6 @@ package main
 import (
 	"context"
 
-	"golang.org/x/sync/errgroup"
-
-	"github.com/restic/restic/internal/backend"
 	"github.com/restic/restic/internal/restic"
 )
 
@@ -24,46 +21,21 @@ func DeleteFilesChecked(ctx context.Context, gopts GlobalOptions, repo restic.Re
 // deleteFiles deletes the given fileList of fileType in parallel
 // if ignoreError=true, it will print a warning if there was an error, else it will abort.
 func deleteFiles(ctx context.Context, gopts GlobalOptions, ignoreError bool, repo restic.Repository, fileList restic.IDSet, fileType restic.FileType) error {
-	totalCount := len(fileList)
-	fileChan := make(chan restic.ID)
-	wg, ctx := errgroup.WithContext(ctx)
-	wg.Go(func() error {
-		defer close(fileChan)
-		for id := range fileList {
-			select {
-			case fileChan <- id:
-			case <-ctx.Done():
-				return ctx.Err()
+	bar := newProgressMax(!gopts.JSON && !gopts.Quiet, 0, "files deleted")
+	defer bar.Done()
+
+	return restic.ParallelRemove(ctx, repo, fileList, fileType, func(id restic.ID, err error) error {
+		if err != nil {
+			if !gopts.JSON {
+				Warnf("unable to remove %v/%v from the repository\n", fileType, id)
+			}
+			if !ignoreError {
+				return err
 			}
 		}
+		if !gopts.JSON && gopts.verbosity > 2 {
+			Verbosef("removed %v/%v\n", fileType, id)
+		}
 		return nil
-	})
-
-	bar := newProgressMax(!gopts.JSON && !gopts.Quiet, uint64(totalCount), "files deleted")
-	defer bar.Done()
-	// deleting files is IO-bound
-	workerCount := repo.Connections()
-	for i := 0; i < int(workerCount); i++ {
-		wg.Go(func() error {
-			for id := range fileChan {
-				h := backend.Handle{Type: fileType, Name: id.String()}
-				err := repo.Backend().Remove(ctx, h)
-				if err != nil {
-					if !gopts.JSON {
-						Warnf("unable to remove %v from the repository\n", h)
-					}
-					if !ignoreError {
-						return err
-					}
-				}
-				if !gopts.JSON && gopts.verbosity > 2 {
-					Verbosef("removed %v\n", h)
-				}
-				bar.Add(1)
-			}
-			return nil
-		})
-	}
-	err := wg.Wait()
-	return err
+	}, bar)
 }

internal/restic/parallel.go

@@ -3,7 +3,9 @@ package restic
 import (
 	"context"
 
+	"github.com/restic/restic/internal/backend"
 	"github.com/restic/restic/internal/debug"
+	"github.com/restic/restic/internal/ui/progress"
 	"golang.org/x/sync/errgroup"
 )
 
@@ -50,3 +52,43 @@ func ParallelList(ctx context.Context, r Lister, t FileType, parallelism uint, f
 
 	return wg.Wait()
 }
+
+// ParallelRemove deletes the given fileList of fileType in parallel
+// if callback returns an error, then it will abort.
+func ParallelRemove(ctx context.Context, repo Repository, fileList IDSet, fileType FileType, report func(id ID, err error) error, bar *progress.Counter) error {
+	fileChan := make(chan ID)
+	wg, ctx := errgroup.WithContext(ctx)
+	wg.Go(func() error {
+		defer close(fileChan)
+		for id := range fileList {
+			select {
+			case fileChan <- id:
+			case <-ctx.Done():
+				return ctx.Err()
+			}
+		}
+		return nil
+	})
+
+	bar.SetMax(uint64(len(fileList)))
+
+	// deleting files is IO-bound
+	workerCount := repo.Connections()
+	for i := 0; i < int(workerCount); i++ {
+		wg.Go(func() error {
+			for id := range fileChan {
+				h := backend.Handle{Type: fileType, Name: id.String()}
+				err := repo.Backend().Remove(ctx, h)
+				if report != nil {
+					err = report(id, err)
+				}
+				if err != nil {
+					return err
+				}
+				bar.Add(1)
+			}
+			return nil
+		})
+	}
+	return wg.Wait()
+}