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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.
166 lines
3.7 KiB
Go
166 lines
3.7 KiB
Go
package 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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"testing"
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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 saveRandomFile(t testing.TB, be restic.Backend, length int) ([]byte, restic.Handle) {
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data := test.Random(23, length)
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id := restic.Hash(data)
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handle := restic.Handle{Type: restic.DataFile, Name: id.String()}
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err := be.Save(context.TODO(), handle, restic.NewByteReader(data))
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if err != nil {
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t.Fatalf("Save() error: %+v", err)
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}
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return data, handle
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}
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func remove(t testing.TB, be restic.Backend, h restic.Handle) {
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if err := be.Remove(context.TODO(), h); err != nil {
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t.Fatalf("Remove() returned error: %v", err)
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}
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}
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// BenchmarkLoadFile benchmarks the Load() method of a backend by
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// loading a complete file.
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func (s *Suite) BenchmarkLoadFile(t *testing.B) {
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be := s.open(t)
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defer s.close(t, be)
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length := 1<<24 + 2123
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data, handle := saveRandomFile(t, be, length)
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defer remove(t, be, handle)
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buf := make([]byte, length)
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t.SetBytes(int64(length))
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t.ResetTimer()
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for i := 0; i < t.N; i++ {
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var n int
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err := be.Load(context.TODO(), handle, 0, 0, func(rd io.Reader) (ierr error) {
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n, ierr = io.ReadFull(rd, buf)
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return ierr
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})
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if err != nil {
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t.Fatal(err)
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}
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if n != length {
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t.Fatalf("wrong number of bytes read: want %v, got %v", length, n)
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}
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if !bytes.Equal(data, buf) {
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t.Fatalf("wrong bytes returned")
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}
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}
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}
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// BenchmarkLoadPartialFile benchmarks the Load() method of a backend by
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// loading the remainder of a file starting at a given offset.
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func (s *Suite) BenchmarkLoadPartialFile(t *testing.B) {
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be := s.open(t)
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defer s.close(t, be)
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datalength := 1<<24 + 2123
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data, handle := saveRandomFile(t, be, datalength)
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defer remove(t, be, handle)
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testLength := datalength/4 + 555
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buf := make([]byte, testLength)
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t.SetBytes(int64(testLength))
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t.ResetTimer()
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for i := 0; i < t.N; i++ {
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var n int
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err := be.Load(context.TODO(), handle, testLength, 0, func(rd io.Reader) (ierr error) {
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n, ierr = io.ReadFull(rd, buf)
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return ierr
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})
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if err != nil {
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t.Fatal(err)
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}
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if n != testLength {
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t.Fatalf("wrong number of bytes read: want %v, got %v", testLength, n)
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}
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if !bytes.Equal(data[:testLength], buf) {
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t.Fatalf("wrong bytes returned")
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}
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}
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}
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// BenchmarkLoadPartialFileOffset benchmarks the Load() method of a
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// backend by loading a number of bytes of a file starting at a given offset.
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func (s *Suite) BenchmarkLoadPartialFileOffset(t *testing.B) {
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be := s.open(t)
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defer s.close(t, be)
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datalength := 1<<24 + 2123
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data, handle := saveRandomFile(t, be, datalength)
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defer remove(t, be, handle)
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testLength := datalength/4 + 555
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testOffset := 8273
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buf := make([]byte, testLength)
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t.SetBytes(int64(testLength))
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t.ResetTimer()
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for i := 0; i < t.N; i++ {
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var n int
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err := be.Load(context.TODO(), handle, testLength, int64(testOffset), func(rd io.Reader) (ierr error) {
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n, ierr = io.ReadFull(rd, buf)
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return ierr
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})
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if err != nil {
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t.Fatal(err)
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}
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if n != testLength {
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t.Fatalf("wrong number of bytes read: want %v, got %v", testLength, n)
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}
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if !bytes.Equal(data[testOffset:testOffset+testLength], buf) {
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t.Fatalf("wrong bytes returned")
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}
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}
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}
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// BenchmarkSave benchmarks the Save() method of a backend.
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func (s *Suite) BenchmarkSave(t *testing.B) {
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be := s.open(t)
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defer s.close(t, be)
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length := 1<<24 + 2123
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data := test.Random(23, length)
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id := restic.Hash(data)
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handle := restic.Handle{Type: restic.DataFile, Name: id.String()}
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rd := restic.NewByteReader(data)
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t.SetBytes(int64(length))
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t.ResetTimer()
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for i := 0; i < t.N; i++ {
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if err := be.Save(context.TODO(), handle, rd); err != nil {
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t.Fatal(err)
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}
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if err := be.Remove(context.TODO(), handle); err != nil {
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t.Fatal(err)
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}
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}
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}
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