package archiver_test import ( "context" "crypto/rand" "io" mrand "math/rand" "sync" "testing" "time" "github.com/restic/restic/internal/errors" "github.com/restic/restic/internal/restic" "github.com/restic/restic/internal/archiver" "github.com/restic/restic/internal/mock" "github.com/restic/restic/internal/repository" ) const parallelSaves = 50 const testSaveIndexTime = 100 * time.Millisecond const testTimeout = 2 * time.Second var DupID restic.ID func randomID() restic.ID { if mrand.Float32() < 0.5 { return DupID } id := restic.ID{} _, err := io.ReadFull(rand.Reader, id[:]) if err != nil { panic(err) } return id } // forgetfulBackend returns a backend that forgets everything. func forgetfulBackend() restic.Backend { be := &mock.Backend{} be.TestFn = func(ctx context.Context, h restic.Handle) (bool, error) { return false, nil } be.LoadFn = func(ctx context.Context, h restic.Handle, length int, offset int64) (io.ReadCloser, error) { return nil, errors.New("not found") } be.SaveFn = func(ctx context.Context, h restic.Handle, rd io.Reader) error { return nil } be.StatFn = func(ctx context.Context, h restic.Handle) (restic.FileInfo, error) { return restic.FileInfo{}, errors.New("not found") } be.RemoveFn = func(ctx context.Context, h restic.Handle) error { return nil } be.ListFn = func(ctx context.Context, t restic.FileType, fn func(restic.FileInfo) error) error { return nil } be.DeleteFn = func(ctx context.Context) error { return nil } return be } func testArchiverDuplication(t *testing.T) { _, err := io.ReadFull(rand.Reader, DupID[:]) if err != nil { t.Fatal(err) } repo := repository.New(forgetfulBackend()) err = repo.Init(context.TODO(), "foo") if err != nil { t.Fatal(err) } arch := archiver.New(repo) wg := &sync.WaitGroup{} done := make(chan struct{}) for i := 0; i < parallelSaves; i++ { wg.Add(1) go func() { defer wg.Done() for { select { case <-done: return default: } id := randomID() if repo.Index().Has(id, restic.DataBlob) { continue } buf := make([]byte, 50) err := arch.Save(context.TODO(), restic.DataBlob, buf, id) if err != nil { t.Fatal(err) } } }() } saveIndex := func() { defer wg.Done() ticker := time.NewTicker(testSaveIndexTime) defer ticker.Stop() for { select { case <-done: return case <-ticker.C: err := repo.SaveFullIndex(context.TODO()) if err != nil { t.Fatal(err) } } } } wg.Add(1) go saveIndex() <-time.After(testTimeout) close(done) wg.Wait() err = repo.Flush(context.Background()) if err != nil { t.Fatal(err) } } func TestArchiverDuplication(t *testing.T) { for i := 0; i < 5; i++ { testArchiverDuplication(t) } }