forked from TrueCloudLab/restic
ff7ef5007e
The ioutil functions are deprecated since Go 1.17 and only wrap another library function. Thus directly call the underlying function. This commit only mechanically replaces the function calls.
364 lines
8.7 KiB
Go
364 lines
8.7 KiB
Go
package retry
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import (
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"bytes"
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"context"
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"io"
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"testing"
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"time"
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"github.com/cenkalti/backoff/v4"
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"github.com/restic/restic/internal/backend/mock"
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"github.com/restic/restic/internal/errors"
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"github.com/restic/restic/internal/restic"
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"github.com/restic/restic/internal/test"
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)
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func TestBackendSaveRetry(t *testing.T) {
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buf := bytes.NewBuffer(nil)
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errcount := 0
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be := &mock.Backend{
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SaveFn: func(ctx context.Context, h restic.Handle, rd restic.RewindReader) error {
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if errcount == 0 {
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errcount++
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_, err := io.CopyN(io.Discard, rd, 120)
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if err != nil {
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return err
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}
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return errors.New("injected error")
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}
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_, err := io.Copy(buf, rd)
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return err
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},
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}
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TestFastRetries(t)
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retryBackend := New(be, 10, nil, nil)
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data := test.Random(23, 5*1024*1024+11241)
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err := retryBackend.Save(context.TODO(), restic.Handle{}, restic.NewByteReader(data, be.Hasher()))
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if err != nil {
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t.Fatal(err)
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}
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if len(data) != buf.Len() {
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t.Errorf("wrong number of bytes written: want %d, got %d", len(data), buf.Len())
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}
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if !bytes.Equal(data, buf.Bytes()) {
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t.Errorf("wrong data written to backend")
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}
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}
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func TestBackendSaveRetryAtomic(t *testing.T) {
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errcount := 0
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calledRemove := false
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be := &mock.Backend{
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SaveFn: func(ctx context.Context, h restic.Handle, rd restic.RewindReader) error {
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if errcount == 0 {
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errcount++
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return errors.New("injected error")
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}
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return nil
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},
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RemoveFn: func(ctx context.Context, h restic.Handle) error {
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calledRemove = true
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return nil
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},
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HasAtomicReplaceFn: func() bool { return true },
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}
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TestFastRetries(t)
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retryBackend := New(be, 10, nil, nil)
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data := test.Random(23, 5*1024*1024+11241)
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err := retryBackend.Save(context.TODO(), restic.Handle{}, restic.NewByteReader(data, be.Hasher()))
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if err != nil {
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t.Fatal(err)
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}
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if calledRemove {
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t.Fatal("remove must not be called")
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}
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}
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func TestBackendListRetry(t *testing.T) {
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const (
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ID1 = "id1"
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ID2 = "id2"
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)
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retry := 0
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be := &mock.Backend{
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ListFn: func(ctx context.Context, t restic.FileType, fn func(restic.FileInfo) error) error {
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// fail during first retry, succeed during second
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retry++
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if retry == 1 {
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_ = fn(restic.FileInfo{Name: ID1})
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return errors.New("test list error")
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}
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_ = fn(restic.FileInfo{Name: ID1})
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_ = fn(restic.FileInfo{Name: ID2})
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return nil
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},
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}
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TestFastRetries(t)
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retryBackend := New(be, 10, nil, nil)
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var listed []string
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err := retryBackend.List(context.TODO(), restic.PackFile, func(fi restic.FileInfo) error {
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listed = append(listed, fi.Name)
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return nil
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})
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test.OK(t, err) // assert overall success
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test.Equals(t, 2, retry) // assert retried once
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test.Equals(t, []string{ID1, ID2}, listed) // assert no duplicate files
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}
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func TestBackendListRetryErrorFn(t *testing.T) {
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var names = []string{"id1", "id2", "foo", "bar"}
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be := &mock.Backend{
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ListFn: func(ctx context.Context, tpe restic.FileType, fn func(restic.FileInfo) error) error {
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t.Logf("List called for %v", tpe)
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for _, name := range names {
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err := fn(restic.FileInfo{Name: name})
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if err != nil {
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return err
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}
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}
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return nil
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},
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}
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TestFastRetries(t)
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retryBackend := New(be, 10, nil, nil)
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var ErrTest = errors.New("test error")
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var listed []string
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run := 0
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err := retryBackend.List(context.TODO(), restic.PackFile, func(fi restic.FileInfo) error {
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t.Logf("fn called for %v", fi.Name)
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run++
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// return an error for the third item in the list
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if run == 3 {
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t.Log("returning an error")
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return ErrTest
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}
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listed = append(listed, fi.Name)
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return nil
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})
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if err != ErrTest {
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t.Fatalf("wrong error returned, want %v, got %v", ErrTest, err)
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}
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// processing should stop after the error was returned, so run should be 3
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if run != 3 {
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t.Fatalf("function was called %d times, wanted %v", run, 3)
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}
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test.Equals(t, []string{"id1", "id2"}, listed)
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}
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func TestBackendListRetryErrorBackend(t *testing.T) {
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var names = []string{"id1", "id2", "foo", "bar"}
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var ErrBackendTest = errors.New("test error")
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retries := 0
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be := &mock.Backend{
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ListFn: func(ctx context.Context, tpe restic.FileType, fn func(restic.FileInfo) error) error {
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t.Logf("List called for %v, retries %v", tpe, retries)
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retries++
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for i, name := range names {
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if i == 2 {
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return ErrBackendTest
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}
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err := fn(restic.FileInfo{Name: name})
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if err != nil {
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return err
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}
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}
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return nil
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},
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}
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TestFastRetries(t)
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const maxRetries = 2
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retryBackend := New(be, maxRetries, nil, nil)
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var listed []string
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err := retryBackend.List(context.TODO(), restic.PackFile, func(fi restic.FileInfo) error {
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t.Logf("fn called for %v", fi.Name)
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listed = append(listed, fi.Name)
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return nil
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})
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if err != ErrBackendTest {
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t.Fatalf("wrong error returned, want %v, got %v", ErrBackendTest, err)
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}
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if retries != maxRetries+1 {
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t.Fatalf("List was called %d times, wanted %v", retries, maxRetries+1)
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}
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test.Equals(t, names[:2], listed)
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}
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// failingReader returns an error after reading limit number of bytes
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type failingReader struct {
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data []byte
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pos int
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limit int
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}
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func (r failingReader) Read(p []byte) (n int, err error) {
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i := 0
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for ; i < len(p) && i+r.pos < r.limit; i++ {
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p[i] = r.data[r.pos+i]
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}
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r.pos += i
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if r.pos >= r.limit {
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return i, errors.Errorf("reader reached limit of %d", r.limit)
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}
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return i, nil
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}
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func (r failingReader) Close() error {
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return nil
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}
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// closingReader adapts io.Reader to io.ReadCloser interface
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type closingReader struct {
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rd io.Reader
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}
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func (r closingReader) Read(p []byte) (n int, err error) {
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return r.rd.Read(p)
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}
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func (r closingReader) Close() error {
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return nil
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}
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func TestBackendLoadRetry(t *testing.T) {
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data := test.Random(23, 1024)
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limit := 100
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attempt := 0
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be := mock.NewBackend()
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be.OpenReaderFn = func(ctx context.Context, h restic.Handle, length int, offset int64) (io.ReadCloser, error) {
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// returns failing reader on first invocation, good reader on subsequent invocations
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attempt++
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if attempt > 1 {
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return closingReader{rd: bytes.NewReader(data)}, nil
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}
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return failingReader{data: data, limit: limit}, nil
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}
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TestFastRetries(t)
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retryBackend := New(be, 10, nil, nil)
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var buf []byte
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err := retryBackend.Load(context.TODO(), restic.Handle{}, 0, 0, func(rd io.Reader) (err error) {
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buf, err = io.ReadAll(rd)
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return err
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})
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test.OK(t, err)
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test.Equals(t, data, buf)
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test.Equals(t, 2, attempt)
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}
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func assertIsCanceled(t *testing.T, err error) {
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test.Assert(t, err == context.Canceled, "got unexpected err %v", err)
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}
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func TestBackendCanceledContext(t *testing.T) {
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// unimplemented mock backend functions return an error by default
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// check that we received the expected context canceled error instead
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TestFastRetries(t)
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retryBackend := New(mock.NewBackend(), 2, nil, nil)
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h := restic.Handle{Type: restic.PackFile, Name: restic.NewRandomID().String()}
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// create an already canceled context
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ctx, cancel := context.WithCancel(context.Background())
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cancel()
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_, err := retryBackend.Test(ctx, h)
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assertIsCanceled(t, err)
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_, err = retryBackend.Stat(ctx, h)
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assertIsCanceled(t, err)
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err = retryBackend.Save(ctx, h, restic.NewByteReader([]byte{}, nil))
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assertIsCanceled(t, err)
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err = retryBackend.Remove(ctx, h)
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assertIsCanceled(t, err)
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err = retryBackend.Load(ctx, restic.Handle{}, 0, 0, func(rd io.Reader) (err error) {
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return nil
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})
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assertIsCanceled(t, err)
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err = retryBackend.List(ctx, restic.PackFile, func(restic.FileInfo) error {
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return nil
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})
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assertIsCanceled(t, err)
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// don't test "Delete" as it is not used by normal code
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}
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func TestNotifyWithSuccessIsNotCalled(t *testing.T) {
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operation := func() error {
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return nil
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}
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notify := func(error, time.Duration) {
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t.Fatal("Notify should not have been called")
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}
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success := func(retries int) {
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t.Fatal("Success should not have been called")
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}
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err := retryNotifyErrorWithSuccess(operation, &backoff.ZeroBackOff{}, notify, success)
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if err != nil {
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t.Fatal("retry should not have returned an error")
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}
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}
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func TestNotifyWithSuccessIsCalled(t *testing.T) {
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operationCalled := 0
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operation := func() error {
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operationCalled++
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if operationCalled <= 2 {
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return errors.New("expected error in test")
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}
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return nil
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}
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notifyCalled := 0
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notify := func(error, time.Duration) {
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notifyCalled++
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}
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successCalled := 0
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success := func(retries int) {
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successCalled++
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}
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err := retryNotifyErrorWithSuccess(operation, &backoff.ZeroBackOff{}, notify, success)
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if err != nil {
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t.Fatal("retry should not have returned an error")
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}
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if notifyCalled != 2 {
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t.Fatalf("Notify should have been called 2 times, but was called %d times instead", notifyCalled)
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}
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if successCalled != 1 {
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t.Fatalf("Success should have been called only once, but was called %d times instead", successCalled)
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}
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}
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