package storage import ( "bytes" "crypto/rand" "io" "os" "testing" "github.com/docker/distribution/digest" "github.com/docker/distribution/registry/storage/driver/inmemory" ) // TestSimpleWrite takes the fileWriter through common write operations // ensuring data integrity. func TestSimpleWrite(t *testing.T) { content := make([]byte, 1<<20) n, err := rand.Read(content) if err != nil { t.Fatalf("unexpected error building random data: %v", err) } if n != len(content) { t.Fatalf("random read did't fill buffer") } dgst, err := digest.FromReader(bytes.NewReader(content)) if err != nil { t.Fatalf("unexpected error digesting random content: %v", err) } driver := inmemory.New() path := "/random" fw, err := newFileWriter(driver, path) if err != nil { t.Fatalf("unexpected error creating fileWriter: %v", err) } defer fw.Close() n, err = fw.Write(content) if err != nil { t.Fatalf("unexpected error writing content: %v", err) } if n != len(content) { t.Fatalf("unexpected write length: %d != %d", n, len(content)) } fr, err := newFileReader(driver, path) if err != nil { t.Fatalf("unexpected error creating fileReader: %v", err) } defer fr.Close() verifier := digest.NewDigestVerifier(dgst) io.Copy(verifier, fr) if !verifier.Verified() { t.Fatalf("unable to verify write data") } // Check the seek position is equal to the content length end, err := fw.Seek(0, os.SEEK_END) if err != nil { t.Fatalf("unexpected error seeking: %v", err) } if end != int64(len(content)) { t.Fatalf("write did not advance offset: %d != %d", end, len(content)) } // Double the content, but use the WriteAt method doubled := append(content, content...) doubledgst, err := digest.FromReader(bytes.NewReader(doubled)) if err != nil { t.Fatalf("unexpected error digesting doubled content: %v", err) } n, err = fw.WriteAt(content, end) if err != nil { t.Fatalf("unexpected error writing content at %d: %v", end, err) } if n != len(content) { t.Fatalf("writeat was short: %d != %d", n, len(content)) } fr, err = newFileReader(driver, path) if err != nil { t.Fatalf("unexpected error creating fileReader: %v", err) } defer fr.Close() verifier = digest.NewDigestVerifier(doubledgst) io.Copy(verifier, fr) if !verifier.Verified() { t.Fatalf("unable to verify write data") } // Check that WriteAt didn't update the offset. end, err = fw.Seek(0, os.SEEK_END) if err != nil { t.Fatalf("unexpected error seeking: %v", err) } if end != int64(len(content)) { t.Fatalf("write did not advance offset: %d != %d", end, len(content)) } // Now, we copy from one path to another, running the data through the // fileReader to fileWriter, rather than the driver.Move command to ensure // everything is working correctly. fr, err = newFileReader(driver, path) if err != nil { t.Fatalf("unexpected error creating fileReader: %v", err) } defer fr.Close() fw, err = newFileWriter(driver, "/copied") if err != nil { t.Fatalf("unexpected error creating fileWriter: %v", err) } defer fw.Close() nn, err := io.Copy(fw, fr) if err != nil { t.Fatalf("unexpected error copying data: %v", err) } if nn != int64(len(doubled)) { t.Fatalf("unexpected copy length: %d != %d", nn, len(doubled)) } fr, err = newFileReader(driver, "/copied") if err != nil { t.Fatalf("unexpected error creating fileReader: %v", err) } defer fr.Close() verifier = digest.NewDigestVerifier(doubledgst) io.Copy(verifier, fr) if !verifier.Verified() { t.Fatalf("unable to verify write data") } }