reader.go

Documentation: cuelabs.dev/go/oci/ociregistry/ocimem

     1  // Copyright 2023 CUE Labs AG
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package ocimem
    16  
    17  import (
    18  	"context"
    19  	"fmt"
    20  
    21  	"cuelabs.dev/go/oci/ociregistry"
    22  )
    23  
    24  // This file implements the ociregistry.Reader methods.
    25  
    26  func (r *Registry) GetBlob(ctx context.Context, repoName string, dig ociregistry.Digest) (ociregistry.BlobReader, error) {
    27  	r.mu.Lock()
    28  	defer r.mu.Unlock()
    29  	b, err := r.blobForDigest(repoName, dig)
    30  	if err != nil {
    31  		return nil, err
    32  	}
    33  	return NewBytesReader(b.data, b.descriptor()), nil
    34  }
    35  
    36  func (r *Registry) GetBlobRange(ctx context.Context, repoName string, dig ociregistry.Digest, o0, o1 int64) (ociregistry.BlobReader, error) {
    37  	r.mu.Lock()
    38  	defer r.mu.Unlock()
    39  	b, err := r.blobForDigest(repoName, dig)
    40  	if err != nil {
    41  		return nil, err
    42  	}
    43  	if o1 < 0 || o1 > int64(len(b.data)) {
    44  		o1 = int64(len(b.data))
    45  	}
    46  	if o0 < 0 || o0 > o1 {
    47  		return nil, fmt.Errorf("invalid range [%d, %d]; have [%d, %d]", o0, o1, 0, len(b.data))
    48  	}
    49  	return NewBytesReader(b.data[o0:o1], b.descriptor()), nil
    50  }
    51  
    52  func (r *Registry) GetManifest(ctx context.Context, repoName string, dig ociregistry.Digest) (ociregistry.BlobReader, error) {
    53  	r.mu.Lock()
    54  	defer r.mu.Unlock()
    55  	b, err := r.manifestForDigest(repoName, dig)
    56  	if err != nil {
    57  		return nil, err
    58  	}
    59  	return NewBytesReader(b.data, b.descriptor()), nil
    60  }
    61  
    62  func (r *Registry) GetTag(ctx context.Context, repoName string, tagName string) (ociregistry.BlobReader, error) {
    63  	desc, err := r.ResolveTag(ctx, repoName, tagName)
    64  	if err != nil {
    65  		return nil, err
    66  	}
    67  	return r.GetManifest(ctx, repoName, desc.Digest)
    68  }
    69  
    70  func (r *Registry) ResolveTag(ctx context.Context, repoName string, tagName string) (ociregistry.Descriptor, error) {
    71  	r.mu.Lock()
    72  	defer r.mu.Unlock()
    73  	repo, err := r.repo(repoName)
    74  	if err != nil {
    75  		return ociregistry.Descriptor{}, err
    76  	}
    77  	desc, ok := repo.tags[tagName]
    78  	if !ok {
    79  		return ociregistry.Descriptor{}, ociregistry.ErrManifestUnknown
    80  	}
    81  	return desc, nil
    82  }
    83  
    84  func (r *Registry) ResolveBlob(ctx context.Context, repoName string, digest ociregistry.Digest) (ociregistry.Descriptor, error) {
    85  	r.mu.Lock()
    86  	defer r.mu.Unlock()
    87  	b, err := r.blobForDigest(repoName, digest)
    88  	if err != nil {
    89  		return ociregistry.Descriptor{}, err
    90  	}
    91  	return b.descriptor(), nil
    92  }
    93  
    94  func (r *Registry) ResolveManifest(ctx context.Context, repoName string, digest ociregistry.Digest) (ociregistry.Descriptor, error) {
    95  	r.mu.Lock()
    96  	defer r.mu.Unlock()
    97  	b, err := r.manifestForDigest(repoName, digest)
    98  	if err != nil {
    99  		return ociregistry.Descriptor{}, err
   100  	}
   101  	return b.descriptor(), nil
   102  }
   103
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