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// Package cache provides facilities to speed up access to the storage
// backend.
package cache
import (
"fmt"
"github.com/docker/distribution"
)
// BlobDescriptorCacheProvider provides repository scoped
// BlobDescriptorService cache instances and a global descriptor cache.
type BlobDescriptorCacheProvider interface {
distribution.BlobDescriptorService
RepositoryScoped(repo string) (distribution.BlobDescriptorService, error)
}
// ValidateDescriptor provides a helper function to ensure that caches have
// common criteria for admitting descriptors.
func ValidateDescriptor(desc distribution.Descriptor) error {
if err := desc.Digest.Validate(); err != nil {
return err
}
if desc.Size < 0 {
return fmt.Errorf("cache: invalid length in descriptor: %v < 0", desc.Size)
}
if desc.MediaType == "" {
return fmt.Errorf("cache: empty mediatype on descriptor: %v", desc)
}
return nil
}
|
