249ad3b76d
After consideration, we've changed the main descriptor field name to for number of bytes to "size" to match convention. While this may be a subjective argument, commonly we refer to files by their "size" rather than their "length". This will match other conventions, like `(FileInfo).Size()` and methods on `io.SizeReaderAt`. Under more broad analysis, this argument doesn't necessarily hold up. If anything, "size" is shorter than "length". Signed-off-by: Stephen J Day <stephen.day@docker.com>
35 lines
908 B
Go
35 lines
908 B
Go
// Package cache provides facilities to speed up access to the storage
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// backend.
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package cache
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import (
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"fmt"
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"github.com/docker/distribution"
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)
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// BlobDescriptorCacheProvider provides repository scoped
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// BlobDescriptorService cache instances and a global descriptor cache.
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type BlobDescriptorCacheProvider interface {
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distribution.BlobDescriptorService
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RepositoryScoped(repo string) (distribution.BlobDescriptorService, error)
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}
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// ValidateDescriptor provides a helper function to ensure that caches have
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// common criteria for admitting descriptors.
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func ValidateDescriptor(desc distribution.Descriptor) error {
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if err := desc.Digest.Validate(); err != nil {
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return err
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}
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if desc.Size < 0 {
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return fmt.Errorf("cache: invalid length in descriptor: %v < 0", desc.Size)
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}
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if desc.MediaType == "" {
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return fmt.Errorf("cache: empty mediatype on descriptor: %v", desc)
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}
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return nil
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}
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