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Signed-off-by: Avi Deitcher <avi@deitcher.net>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,104 @@ | ||
| package content_test | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
| "testing" | ||
|
|
||
| ctrcontent "github.com/containerd/containerd/content" | ||
| "github.com/deislabs/oras/pkg/content" | ||
| digest "github.com/opencontainers/go-digest" | ||
| ocispec "github.com/opencontainers/image-spec/specs-go/v1" | ||
| ) | ||
|
|
||
| var ( | ||
| testRef = "abc123" | ||
| testContent = []byte("Hello World!") | ||
| appendText = "1" | ||
| modifiedContent = fmt.Sprintf("%s%s", testContent, appendText) | ||
| testDescriptor = ocispec.Descriptor{ | ||
| MediaType: ocispec.MediaTypeImageConfig, | ||
| Digest: digest.FromBytes(testContent), | ||
| Size: int64(len(testContent)), | ||
| Annotations: map[string]string{ | ||
| ocispec.AnnotationTitle: testRef, | ||
| }, | ||
| } | ||
| modifiedDescriptor = ocispec.Descriptor{ | ||
| MediaType: ocispec.MediaTypeImageConfig, | ||
| Digest: digest.FromBytes([]byte(modifiedContent)), | ||
| Size: int64(len(modifiedContent)), | ||
| Annotations: map[string]string{ | ||
| ocispec.AnnotationTitle: testRef, | ||
| }, | ||
| } | ||
| ) | ||
|
|
||
| func TestPassthroughWriter(t *testing.T) { | ||
| // simple pass through function that modifies the data just slightly | ||
| f := func(r io.Reader, w io.Writer, done chan<- error) { | ||
| var ( | ||
| err error | ||
| n int | ||
| ) | ||
| for { | ||
| b := make([]byte, 1024) | ||
| n, err = r.Read(b) | ||
| if err != nil && err != io.EOF { | ||
| t.Fatalf("data read error: %v", err) | ||
| break | ||
| } | ||
| l := n | ||
| if n > len(b) { | ||
| l = len(b) | ||
| } | ||
|
|
||
| // we change it just slightly | ||
| b = b[:l] | ||
| if l > 0 { | ||
| b = append(b, 0x31) | ||
| } | ||
| if _, err := w.Write(b); err != nil { | ||
| t.Fatalf("error writing to underlying writer: %v", err) | ||
| break | ||
| } | ||
| if err == io.EOF { | ||
| break | ||
| } | ||
| } | ||
| done <- err | ||
| } | ||
| ctx := context.Background() | ||
| mem := content.NewMemoryStore() | ||
| memw, err := mem.Writer(ctx, ctrcontent.WithDescriptor(modifiedDescriptor)) | ||
| if err != nil { | ||
| t.Fatalf("unexpected error getting the memory store writer: %v", err) | ||
| } | ||
| writer := content.NewPassthroughWriter(memw, f) | ||
| n, err := writer.Write(testContent) | ||
| if err != nil { | ||
| t.Fatalf("unexpected error on Write: %v", err) | ||
| } | ||
| if n != len(testContent) { | ||
| t.Fatalf("wrote %d bytes instead of %d", n, len(testContent)) | ||
| } | ||
| if err := writer.Commit(ctx, testDescriptor.Size, testDescriptor.Digest); err != nil { | ||
| t.Errorf("unexpected error on Commit: %v", err) | ||
| } | ||
| if digest := writer.Digest(); digest != testDescriptor.Digest { | ||
| t.Errorf("mismatched digest: actual %v, expected %v", digest, testDescriptor.Digest) | ||
| } | ||
|
|
||
| // make sure the data is what we expected | ||
| _, b, found := mem.Get(modifiedDescriptor) | ||
| if !found { | ||
| t.Fatalf("target descriptor not found in underlying memory store") | ||
| } | ||
| if len(b) != len(modifiedContent) { | ||
| t.Errorf("unexpectedly got %d bytes instead of expected %d", len(b), len(modifiedContent)) | ||
| } | ||
| if string(b) != modifiedContent { | ||
| t.Errorf("mismatched content, expected '%s', got '%s'", modifiedContent, string(b)) | ||
| } | ||
| } |