backend: extract most debug logs into logger backend

internal/backend/logger/log.go

@@ -0,0 +1,77 @@
+package logger
+
+import (
+	"context"
+	"io"
+
+	"github.com/restic/restic/internal/debug"
+	"github.com/restic/restic/internal/restic"
+)
+
+type Backend struct {
+	restic.Backend
+}
+
+// statically ensure that Backend implements restic.Backend.
+var _ restic.Backend = &Backend{}
+
+func New(be restic.Backend) *Backend {
+	return &Backend{Backend: be}
+}
+
+func (be *Backend) IsNotExist(err error) bool {
+	isNotExist := be.Backend.IsNotExist(err)
+	debug.Log("IsNotExist(%T, %#v, %v)", err, err, isNotExist)
+	return isNotExist
+}
+
+// Save adds new Data to the backend.
+func (be *Backend) Save(ctx context.Context, h restic.Handle, rd restic.RewindReader) error {
+	debug.Log("Save(%v, %v)", h, rd.Length())
+	err := be.Backend.Save(ctx, h, rd)
+	debug.Log("  save err %v", err)
+	return err
+}
+
+// Remove deletes a file from the backend.
+func (be *Backend) Remove(ctx context.Context, h restic.Handle) error {
+	debug.Log("Remove(%v)", h)
+	err := be.Backend.Remove(ctx, h)
+	debug.Log("  remove err %v", err)
+	return err
+}
+
+func (be *Backend) Load(ctx context.Context, h restic.Handle, length int, offset int64, fn func(io.Reader) error) error {
+	debug.Log("Load(%v, length %v, offset %v)", h, length, offset)
+	err := be.Backend.Load(ctx, h, length, offset, fn)
+	debug.Log("  load err %v", err)
+	return err
+}
+
+func (be *Backend) Stat(ctx context.Context, h restic.Handle) (restic.FileInfo, error) {
+	debug.Log("Stat(%v)", h)
+	fi, err := be.Backend.Stat(ctx, h)
+	debug.Log("  stat err %v", err)
+	return fi, err
+}
+
+func (be *Backend) List(ctx context.Context, t restic.FileType, fn func(restic.FileInfo) error) error {
+	debug.Log("List(%v)", t)
+	err := be.Backend.List(ctx, t, fn)
+	debug.Log("  list err %v", err)
+	return err
+}
+
+func (be *Backend) Delete(ctx context.Context) error {
+	debug.Log("Delete()")
+	err := be.Backend.Delete(ctx)
+	debug.Log("  delete err %v", err)
+	return err
+}
+
+func (be *Backend) Close() error {
+	debug.Log("Close()")
+	err := be.Backend.Close()
+	debug.Log("  close err %v", err)
+	return err
+}