backend tests: Add configurable delay for delayed remove

src/restic/backend/b2/b2_test.go

@@ -19,6 +19,9 @@ func newB2TestSuite(t testing.TB) *test.Suite {
 		// do not use excessive data
 		MinimalData: true,
 
+		// wait for at most 10 seconds for removed files to disappear
+		WaitForDelayedRemoval: 10 * time.Second,
+
 		// NewConfig returns a config for a new temporary backend that will be used in tests.
 		NewConfig: func() (interface{}, error) {
 			b2cfg, err := b2.ParseConfig(os.Getenv("RESTIC_TEST_B2_REPOSITORY"))

src/restic/backend/swift/swift_test.go

@@ -20,6 +20,9 @@ func newSwiftTestSuite(t testing.TB) *test.Suite {
 		// do not use excessive data
 		MinimalData: true,
 
+		// wait for removals for at least 10s
+		WaitForDelayedRemoval: 10 * time.Second,
+
 		// NewConfig returns a config for a new temporary backend that will be used in tests.
 		NewConfig: func() (interface{}, error) {
 			swiftcfg, err := swift.ParseConfig(os.Getenv("RESTIC_TEST_SWIFT"))

src/restic/backend/test/suite.go

@@ -6,10 +6,12 @@ import (
 	"restic/test"
 	"strings"
 	"testing"
+	"time"
 )
 
 // Suite implements a test suite for restic backends.
 type Suite struct {
+	// Config should be used to configure the backend.
 	Config interface{}
 
 	// NewConfig returns a config for a new temporary backend that will be used in tests.
@@ -26,6 +28,11 @@ type Suite struct {
 
 	// MinimalData instructs the tests to not use excessive data.
 	MinimalData bool
+
+	// WaitForDelayedRemoval is set to a non-zero value to instruct the test
+	// suite to wait for this amount of time until a file that was removed
+	// really disappeared.
+	WaitForDelayedRemoval time.Duration
 }
 
 // RunTests executes all defined tests as subtests of t.

src/restic/backend/test/tests.go

@@ -435,17 +435,18 @@ func testLoad(b restic.Backend, h restic.Handle, length int, offset int64) error
 	return err
 }
 
-func delayedRemove(b restic.Backend, h restic.Handle) error {
+func delayedRemove(t testing.TB, be restic.Backend, h restic.Handle, maxwait time.Duration) error {
 	// Some backend (swift, I'm looking at you) may implement delayed
 	// removal of data. Let's wait a bit if this happens.
-	err := b.Remove(context.TODO(), h)
+	err := be.Remove(context.TODO(), h)
 	if err != nil {
 		return err
 	}
 
-	found, err := b.Test(context.TODO(), h)
-	for i := 0; found && i < 20; i++ {
-		found, err = b.Test(context.TODO(), h)
+	start := time.Now()
+	attempt := 0
+	for time.Since(start) <= maxwait {
+		found, err := be.Test(context.TODO(), h)
 		if err != nil {
 			return err
 		}
@@ -454,20 +455,23 @@ func delayedRemove(b restic.Backend, h restic.Handle) error {
 			break
 		}
 
-		time.Sleep(100 * time.Millisecond)
+		time.Sleep(500 * time.Millisecond)
+		attempt++
 	}
-	return err
+
+	return nil
 }
 
-func delayedList(t testing.TB, b restic.Backend, tpe restic.FileType, max int) restic.IDs {
+func delayedList(t testing.TB, b restic.Backend, tpe restic.FileType, max int, maxwait time.Duration) restic.IDs {
 	list := restic.NewIDSet()
+	start := time.Now()
 	for i := 0; i < max; i++ {
 		for s := range b.List(context.TODO(), tpe) {
 			id := restic.TestParseID(s)
 			list.Insert(id)
 		}
-		if len(list) < max {
-			time.Sleep(100 * time.Millisecond)
+		if len(list) < max && time.Since(start) < maxwait {
+			time.Sleep(500 * time.Millisecond)
 		}
 	}
 
@@ -548,7 +552,7 @@ func (s *Suite) TestBackend(t *testing.T) {
 		test.Assert(t, err != nil, "expected error for %v, got %v", h, err)
 
 		// remove and recreate
-		err = delayedRemove(b, h)
+		err = delayedRemove(t, b, h, s.WaitForDelayedRemoval)
 		test.OK(t, err)
 
 		// test that the blob is gone
@@ -569,7 +573,7 @@ func (s *Suite) TestBackend(t *testing.T) {
 			IDs = append(IDs, id)
 		}
 
-		list := delayedList(t, b, tpe, len(IDs))
+		list := delayedList(t, b, tpe, len(IDs), s.WaitForDelayedRemoval)
 		if len(IDs) != len(list) {
 			t.Fatalf("wrong number of IDs returned: want %d, got %d", len(IDs), len(list))
 		}
@@ -593,7 +597,7 @@ func (s *Suite) TestBackend(t *testing.T) {
 				test.OK(t, err)
 				test.Assert(t, found, fmt.Sprintf("id %q not found", id))
 
-				test.OK(t, delayedRemove(b, h))
+				test.OK(t, delayedRemove(t, b, h, s.WaitForDelayedRemoval))
 
 				found, err = b.Test(context.TODO(), h)
 				test.OK(t, err)