Golang Descriptor.MediaType方法代码示例

func descriptorFromResponse(response *http.Response) (distribution.Descriptor, error) {
	desc := distribution.Descriptor{}
	headers := response.Header

	ctHeader := headers.Get("Content-Type")
	if ctHeader == "" {
		return distribution.Descriptor{}, errors.New("missing or empty Content-Type header")
	}
	desc.MediaType = ctHeader

	digestHeader := headers.Get("Docker-Content-Digest")
	if digestHeader == "" {
		bytes, err := ioutil.ReadAll(response.Body)
		if err != nil {
			return distribution.Descriptor{}, err
		}
		_, desc, err := distribution.UnmarshalManifest(ctHeader, bytes)
		if err != nil {
			return distribution.Descriptor{}, err
		}
		return desc, nil
	}

	dgst, err := digest.ParseDigest(digestHeader)
	if err != nil {
		return distribution.Descriptor{}, err
	}
	desc.Digest = dgst

	lengthHeader := headers.Get("Content-Length")
	if lengthHeader == "" {
		return distribution.Descriptor{}, errors.New("missing or empty Content-Length header")
	}
	length, err := strconv.ParseInt(lengthHeader, 10, 64)
	if err != nil {
		return distribution.Descriptor{}, err
	}
	desc.Size = length

	return desc, nil

}

func checkBlobDescriptorCacheSetAndRead(ctx context.Context, t *testing.T, provider cache.BlobDescriptorCacheProvider) {
	localDigest := digest.Digest("sha384:abc111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111")
	expected := distribution.Descriptor{
		Digest:    "sha256:abc1111111111111111111111111111111111111111111111111111111111111",
		Size:      10,
		MediaType: "application/octet-stream"}

	cache, err := provider.RepositoryScoped("foo/bar")
	if err != nil {
		t.Fatalf("unexpected error getting scoped cache: %v", err)
	}

	if err := cache.SetDescriptor(ctx, localDigest, expected); err != nil {
		t.Fatalf("error setting descriptor: %v", err)
	}

	desc, err := cache.Stat(ctx, localDigest)
	if err != nil {
		t.Fatalf("unexpected error statting fake2:abc: %v", err)
	}

	if !reflect.DeepEqual(expected, desc) {
		t.Fatalf("unexpected descriptor: %#v != %#v", expected, desc)
	}

	// also check that we set the canonical key ("fake:abc")
	desc, err = cache.Stat(ctx, localDigest)
	if err != nil {
		t.Fatalf("descriptor not returned for canonical key: %v", err)
	}

	if !reflect.DeepEqual(expected, desc) {
		t.Fatalf("unexpected descriptor: %#v != %#v", expected, desc)
	}

	// ensure that global gets extra descriptor mapping
	desc, err = provider.Stat(ctx, localDigest)
	if err != nil {
		t.Fatalf("expected blob unknown in global cache: %v, %v", err, desc)
	}

	if !reflect.DeepEqual(desc, expected) {
		t.Fatalf("unexpected descriptor: %#v != %#v", expected, desc)
	}

	// get at it through canonical descriptor
	desc, err = provider.Stat(ctx, expected.Digest)
	if err != nil {
		t.Fatalf("unexpected error checking glboal descriptor: %v", err)
	}

	if !reflect.DeepEqual(desc, expected) {
		t.Fatalf("unexpected descriptor: %#v != %#v", expected, desc)
	}

	// now, we set the repo local mediatype to something else and ensure it
	// doesn't get changed in the provider cache.
	expected.MediaType = "application/json"

	if err := cache.SetDescriptor(ctx, localDigest, expected); err != nil {
		t.Fatalf("unexpected error setting descriptor: %v", err)
	}

	desc, err = cache.Stat(ctx, localDigest)
	if err != nil {
		t.Fatalf("unexpected error getting descriptor: %v", err)
	}

	if !reflect.DeepEqual(desc, expected) {
		t.Fatalf("unexpected descriptor: %#v != %#v", desc, expected)
	}

	desc, err = provider.Stat(ctx, localDigest)
	if err != nil {
		t.Fatalf("unexpected error getting global descriptor: %v", err)
	}

	expected.MediaType = "application/octet-stream" // expect original mediatype in global

	if !reflect.DeepEqual(desc, expected) {
		t.Fatalf("unexpected descriptor: %#v != %#v", desc, expected)
	}
}

//.........这里部分代码省略.........
			return distribution.Descriptor{}, fmt.Errorf("unexpected directory at upload location %q", bw.path)
		}

		bw.size = fi.Size()
	}

	if desc.Size > 0 {
		if desc.Size != bw.size {
			return distribution.Descriptor{}, distribution.ErrBlobInvalidLength
		}
	} else {
		// if provided 0 or negative length, we can assume caller doesn't know or
		// care about length.
		desc.Size = bw.size
	}

	// TODO(stevvooe): This section is very meandering. Need to be broken down
	// to be a lot more clear.

	if err := bw.resumeDigestAt(ctx, bw.size); err == nil {
		canonical = bw.digester.Digest()

		if canonical.Algorithm() == desc.Digest.Algorithm() {
			// Common case: client and server prefer the same canonical digest
			// algorithm - currently SHA256.
			verified = desc.Digest == canonical
		} else {
			// The client wants to use a different digest algorithm. They'll just
			// have to be patient and wait for us to download and re-hash the
			// uploaded content using that digest algorithm.
			fullHash = true
		}
	} else if err == errResumableDigestNotAvailable {
		// Not using resumable digests, so we need to hash the entire layer.
		fullHash = true
	} else {
		return distribution.Descriptor{}, err
	}

	if fullHash {
		// a fantastic optimization: if the the written data and the size are
		// the same, we don't need to read the data from the backend. This is
		// because we've written the entire file in the lifecycle of the
		// current instance.
		if bw.written == bw.size && digest.Canonical == desc.Digest.Algorithm() {
			canonical = bw.digester.Digest()
			verified = desc.Digest == canonical
		}

		// If the check based on size fails, we fall back to the slowest of
		// paths. We may be able to make the size-based check a stronger
		// guarantee, so this may be defensive.
		if !verified {
			digester := digest.Canonical.New()

			digestVerifier, err := digest.NewDigestVerifier(desc.Digest)
			if err != nil {
				return distribution.Descriptor{}, err
			}

			// Read the file from the backend driver and validate it.
			fr, err := newFileReader(ctx, bw.fileWriter.driver, bw.path, desc.Size)
			if err != nil {
				return distribution.Descriptor{}, err
			}
			defer fr.Close()

			tr := io.TeeReader(fr, digester.Hash())

			if _, err := io.Copy(digestVerifier, tr); err != nil {
				return distribution.Descriptor{}, err
			}

			canonical = digester.Digest()
			verified = digestVerifier.Verified()
		}
	}

	if !verified {
		context.GetLoggerWithFields(ctx,
			map[interface{}]interface{}{
				"canonical": canonical,
				"provided":  desc.Digest,
			}, "canonical", "provided").
			Errorf("canonical digest does match provided digest")
		return distribution.Descriptor{}, distribution.ErrBlobInvalidDigest{
			Digest: desc.Digest,
			Reason: fmt.Errorf("content does not match digest"),
		}
	}

	// update desc with canonical hash
	desc.Digest = canonical

	if desc.MediaType == "" {
		desc.MediaType = "application/octet-stream"
	}

	return desc, nil
}