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package blobinfocache
import (
"github.com/containers/image/v5/types"
digest "github.com/opencontainers/go-digest"
)
const (
// Uncompressed is the value we store in a blob info cache to indicate that we know that
// the blob in the corresponding location is not compressed.
Uncompressed = "uncompressed"
// UnknownCompression is the value we store in a blob info cache to indicate that we don't
// know if the blob in the corresponding location is compressed (and if so, how) or not.
UnknownCompression = "unknown"
)
// BlobInfoCache2 extends BlobInfoCache by adding the ability to track information about what kind
// of compression was applied to the blobs it keeps information about.
type BlobInfoCache2 interface {
types.BlobInfoCache
// Open() sets up the cache for future accesses, potentially acquiring costly state. Each Open() must be paired with a Close().
// Note that public callers may call the types.BlobInfoCache operations without Open()/Close().
Open()
// Close destroys state created by Open().
Close()
// RecordDigestCompressorName records a compressor for the blob with the specified digest,
// or Uncompressed or UnknownCompression.
// WARNING: Only call this with LOCALLY VERIFIED data; don’t record a compressor for a
// digest just because some remote author claims so (e.g. because a manifest says so);
// otherwise the cache could be poisoned and cause us to make incorrect edits to type
// information in a manifest.
RecordDigestCompressorName(anyDigest digest.Digest, compressorName string)
// CandidateLocations2 returns a prioritized, limited, number of blobs and their locations
// that could possibly be reused within the specified (transport scope) (if they still
// exist, which is not guaranteed).
//
// If !canSubstitute, the returned cadidates will match the submitted digest exactly; if
// canSubstitute, data from previous RecordDigestUncompressedPair calls is used to also look
// up variants of the blob which have the same uncompressed digest.
//
// The CompressorName fields in returned data must never be UnknownCompression.
CandidateLocations2(transport types.ImageTransport, scope types.BICTransportScope, digest digest.Digest, canSubstitute bool) []BICReplacementCandidate2
}
// BICReplacementCandidate2 is an item returned by BlobInfoCache2.CandidateLocations2.
type BICReplacementCandidate2 struct {
Digest digest.Digest
CompressorName string // either the Name() of a known pkg/compression.Algorithm, or Uncompressed or UnknownCompression
Location types.BICLocationReference
}
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