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99f7fd74e3
As mentioned in issue [#1560](https://github.com/restic/restic/pull/1560#issuecomment-364689346) this changes the signature for `backend.Save()`. It now takes a parameter of interface type `RewindReader`, so that the backend implementations or our `RetryBackend` middleware can reset the reader to the beginning and then retry an upload operation. The `RewindReader` interface also provides a `Length()` method, which is used in the backend to get the size of the data to be saved. This removes several ugly hacks we had to do to pull the size back out of the `io.Reader` passed to `Save()` before. In the `s3` and `rest` backend this is actively used.
148 lines
3.8 KiB
Go
148 lines
3.8 KiB
Go
package backend_test
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import (
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"bytes"
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"context"
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"io"
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"math/rand"
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"testing"
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"github.com/restic/restic/internal/backend"
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"github.com/restic/restic/internal/backend/mem"
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"github.com/restic/restic/internal/errors"
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"github.com/restic/restic/internal/restic"
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rtest "github.com/restic/restic/internal/test"
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)
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const KiB = 1 << 10
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const MiB = 1 << 20
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func TestLoadAll(t *testing.T) {
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b := mem.New()
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for i := 0; i < 20; i++ {
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data := rtest.Random(23+i, rand.Intn(MiB)+500*KiB)
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id := restic.Hash(data)
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h := restic.Handle{Name: id.String(), Type: restic.DataFile}
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err := b.Save(context.TODO(), h, restic.NewByteReader(data))
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rtest.OK(t, err)
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buf, err := backend.LoadAll(context.TODO(), b, restic.Handle{Type: restic.DataFile, Name: id.String()})
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rtest.OK(t, err)
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if len(buf) != len(data) {
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t.Errorf("length of returned buffer does not match, want %d, got %d", len(data), len(buf))
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continue
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}
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if !bytes.Equal(buf, data) {
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t.Errorf("wrong data returned")
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continue
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}
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}
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}
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func TestLoadSmallBuffer(t *testing.T) {
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b := mem.New()
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for i := 0; i < 20; i++ {
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data := rtest.Random(23+i, rand.Intn(MiB)+500*KiB)
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id := restic.Hash(data)
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h := restic.Handle{Name: id.String(), Type: restic.DataFile}
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err := b.Save(context.TODO(), h, restic.NewByteReader(data))
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rtest.OK(t, err)
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buf, err := backend.LoadAll(context.TODO(), b, restic.Handle{Type: restic.DataFile, Name: id.String()})
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rtest.OK(t, err)
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if len(buf) != len(data) {
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t.Errorf("length of returned buffer does not match, want %d, got %d", len(data), len(buf))
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continue
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}
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if !bytes.Equal(buf, data) {
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t.Errorf("wrong data returned")
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continue
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}
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}
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}
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func TestLoadLargeBuffer(t *testing.T) {
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b := mem.New()
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for i := 0; i < 20; i++ {
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data := rtest.Random(23+i, rand.Intn(MiB)+500*KiB)
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id := restic.Hash(data)
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h := restic.Handle{Name: id.String(), Type: restic.DataFile}
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err := b.Save(context.TODO(), h, restic.NewByteReader(data))
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rtest.OK(t, err)
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buf, err := backend.LoadAll(context.TODO(), b, restic.Handle{Type: restic.DataFile, Name: id.String()})
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rtest.OK(t, err)
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if len(buf) != len(data) {
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t.Errorf("length of returned buffer does not match, want %d, got %d", len(data), len(buf))
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continue
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}
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if !bytes.Equal(buf, data) {
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t.Errorf("wrong data returned")
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continue
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}
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}
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}
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type mockReader struct {
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closed bool
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}
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func (rd *mockReader) Read(p []byte) (n int, err error) {
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return 0, nil
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}
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func (rd *mockReader) Close() error {
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rd.closed = true
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return nil
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}
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func TestDefaultLoad(t *testing.T) {
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h := restic.Handle{Name: "id", Type: restic.DataFile}
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rd := &mockReader{}
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// happy case, assert correct parameters are passed around and content stream is closed
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err := backend.DefaultLoad(context.TODO(), h, 10, 11, func(ctx context.Context, ih restic.Handle, length int, offset int64) (io.ReadCloser, error) {
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rtest.Equals(t, h, ih)
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rtest.Equals(t, int(10), length)
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rtest.Equals(t, int64(11), offset)
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return rd, nil
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}, func(ird io.Reader) error {
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rtest.Equals(t, rd, ird)
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return nil
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})
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rtest.OK(t, err)
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rtest.Equals(t, true, rd.closed)
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// unhappy case, assert producer errors are handled correctly
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err = backend.DefaultLoad(context.TODO(), h, 10, 11, func(ctx context.Context, ih restic.Handle, length int, offset int64) (io.ReadCloser, error) {
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return nil, errors.Errorf("producer error")
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}, func(ird io.Reader) error {
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t.Fatalf("unexpected consumer invocation")
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return nil
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})
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rtest.Equals(t, "producer error", err.Error())
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// unhappy case, assert consumer errors are handled correctly
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rd = &mockReader{}
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err = backend.DefaultLoad(context.TODO(), h, 10, 11, func(ctx context.Context, ih restic.Handle, length int, offset int64) (io.ReadCloser, error) {
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return rd, nil
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}, func(ird io.Reader) error {
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return errors.Errorf("consumer error")
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})
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rtest.Equals(t, true, rd.closed)
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rtest.Equals(t, "consumer error", err.Error())
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}
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