distribution/registry/storage/cache/memory.go
Jordan Liggitt 32ed2d7df1 Fix typo: respository->repository
Signed-off-by: Jordan Liggitt <jliggitt@redhat.com>
2015-05-19 13:25:39 -04:00

149 lines
4.4 KiB
Go

package cache
import (
"sync"
"github.com/docker/distribution"
"github.com/docker/distribution/context"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/registry/api/v2"
)
type inMemoryBlobDescriptorCacheProvider struct {
global *mapBlobDescriptorCache
repositories map[string]*mapBlobDescriptorCache
mu sync.RWMutex
}
// NewInMemoryBlobDescriptorCacheProvider returns a new mapped-based cache for
// storing blob descriptor data.
func NewInMemoryBlobDescriptorCacheProvider() BlobDescriptorCacheProvider {
return &inMemoryBlobDescriptorCacheProvider{
global: newMapBlobDescriptorCache(),
repositories: make(map[string]*mapBlobDescriptorCache),
}
}
func (imbdcp *inMemoryBlobDescriptorCacheProvider) RepositoryScoped(repo string) (distribution.BlobDescriptorService, error) {
if err := v2.ValidateRepositoryName(repo); err != nil {
return nil, err
}
imbdcp.mu.RLock()
defer imbdcp.mu.RUnlock()
return &repositoryScopedInMemoryBlobDescriptorCache{
repo: repo,
parent: imbdcp,
repository: imbdcp.repositories[repo],
}, nil
}
func (imbdcp *inMemoryBlobDescriptorCacheProvider) Stat(ctx context.Context, dgst digest.Digest) (distribution.Descriptor, error) {
return imbdcp.global.Stat(ctx, dgst)
}
func (imbdcp *inMemoryBlobDescriptorCacheProvider) SetDescriptor(ctx context.Context, dgst digest.Digest, desc distribution.Descriptor) error {
_, err := imbdcp.Stat(ctx, dgst)
if err == distribution.ErrBlobUnknown {
if dgst.Algorithm() != desc.Digest.Algorithm() && dgst != desc.Digest {
// if the digests differ, set the other canonical mapping
if err := imbdcp.global.SetDescriptor(ctx, desc.Digest, desc); err != nil {
return err
}
}
// unknown, just set it
return imbdcp.global.SetDescriptor(ctx, dgst, desc)
}
// we already know it, do nothing
return err
}
// repositoryScopedInMemoryBlobDescriptorCache provides the request scoped
// repository cache. Instances are not thread-safe but the delegated
// operations are.
type repositoryScopedInMemoryBlobDescriptorCache struct {
repo string
parent *inMemoryBlobDescriptorCacheProvider // allows lazy allocation of repo's map
repository *mapBlobDescriptorCache
}
func (rsimbdcp *repositoryScopedInMemoryBlobDescriptorCache) Stat(ctx context.Context, dgst digest.Digest) (distribution.Descriptor, error) {
if rsimbdcp.repository == nil {
return distribution.Descriptor{}, distribution.ErrBlobUnknown
}
return rsimbdcp.repository.Stat(ctx, dgst)
}
func (rsimbdcp *repositoryScopedInMemoryBlobDescriptorCache) SetDescriptor(ctx context.Context, dgst digest.Digest, desc distribution.Descriptor) error {
if rsimbdcp.repository == nil {
// allocate map since we are setting it now.
rsimbdcp.parent.mu.Lock()
var ok bool
// have to read back value since we may have allocated elsewhere.
rsimbdcp.repository, ok = rsimbdcp.parent.repositories[rsimbdcp.repo]
if !ok {
rsimbdcp.repository = newMapBlobDescriptorCache()
rsimbdcp.parent.repositories[rsimbdcp.repo] = rsimbdcp.repository
}
rsimbdcp.parent.mu.Unlock()
}
if err := rsimbdcp.repository.SetDescriptor(ctx, dgst, desc); err != nil {
return err
}
return rsimbdcp.parent.SetDescriptor(ctx, dgst, desc)
}
// mapBlobDescriptorCache provides a simple map-based implementation of the
// descriptor cache.
type mapBlobDescriptorCache struct {
descriptors map[digest.Digest]distribution.Descriptor
mu sync.RWMutex
}
var _ distribution.BlobDescriptorService = &mapBlobDescriptorCache{}
func newMapBlobDescriptorCache() *mapBlobDescriptorCache {
return &mapBlobDescriptorCache{
descriptors: make(map[digest.Digest]distribution.Descriptor),
}
}
func (mbdc *mapBlobDescriptorCache) Stat(ctx context.Context, dgst digest.Digest) (distribution.Descriptor, error) {
if err := validateDigest(dgst); err != nil {
return distribution.Descriptor{}, err
}
mbdc.mu.RLock()
defer mbdc.mu.RUnlock()
desc, ok := mbdc.descriptors[dgst]
if !ok {
return distribution.Descriptor{}, distribution.ErrBlobUnknown
}
return desc, nil
}
func (mbdc *mapBlobDescriptorCache) SetDescriptor(ctx context.Context, dgst digest.Digest, desc distribution.Descriptor) error {
if err := validateDigest(dgst); err != nil {
return err
}
if err := validateDescriptor(desc); err != nil {
return err
}
mbdc.mu.Lock()
defer mbdc.mu.Unlock()
mbdc.descriptors[dgst] = desc
return nil
}