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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.
114 lines
2.3 KiB
Go
114 lines
2.3 KiB
Go
package cache
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import (
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"bytes"
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"context"
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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/restic"
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"github.com/restic/restic/internal/test"
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)
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func loadAndCompare(t testing.TB, be restic.Backend, h restic.Handle, data []byte) {
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buf, err := backend.LoadAll(context.TODO(), be, h)
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if err != nil {
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t.Fatal(err)
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}
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if len(buf) != len(data) {
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t.Fatalf("wrong number of bytes read, want %v, got %v", len(data), len(buf))
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}
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if !bytes.Equal(buf, data) {
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t.Fatalf("wrong data returned, want:\n %02x\ngot:\n %02x", data[:16], buf[:16])
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}
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}
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func save(t testing.TB, be restic.Backend, h restic.Handle, data []byte) {
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err := be.Save(context.TODO(), h, restic.NewByteReader(data))
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if err != nil {
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t.Fatal(err)
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}
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}
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func remove(t testing.TB, be restic.Backend, h restic.Handle) {
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err := be.Remove(context.TODO(), h)
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if err != nil {
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t.Fatal(err)
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}
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}
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func randomData(n int) (restic.Handle, []byte) {
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data := test.Random(rand.Int(), n)
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id := restic.Hash(data)
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copy(id[:], data)
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h := restic.Handle{
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Type: restic.IndexFile,
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Name: id.String(),
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}
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return h, data
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}
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func TestBackend(t *testing.T) {
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be := mem.New()
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c, cleanup := TestNewCache(t)
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defer cleanup()
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wbe := c.Wrap(be)
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h, data := randomData(5234142)
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// save directly in backend
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save(t, be, h, data)
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if c.Has(h) {
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t.Errorf("cache has file too early")
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}
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// load data via cache
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loadAndCompare(t, wbe, h, data)
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if !c.Has(h) {
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t.Errorf("cache doesn't have file after load")
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}
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// remove via cache
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remove(t, wbe, h)
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if c.Has(h) {
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t.Errorf("cache has file after remove")
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}
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// save via cache
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save(t, wbe, h, data)
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if !c.Has(h) {
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t.Errorf("cache doesn't have file after load")
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}
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// load data directly from backend
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loadAndCompare(t, be, h, data)
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// load data via cache
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loadAndCompare(t, be, h, data)
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// remove directly
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remove(t, be, h)
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if !c.Has(h) {
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t.Errorf("file not in cache any more")
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}
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// run stat
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_, err := wbe.Stat(context.TODO(), h)
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if err == nil {
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t.Errorf("expected error for removed file not found, got nil")
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}
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if !wbe.IsNotExist(err) {
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t.Errorf("Stat() returned error that does not match IsNotExist(): %v", err)
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}
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if c.Has(h) {
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t.Errorf("removed file still in cache after stat")
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}
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}
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