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Add locking to repository access in memory cache

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Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
This commit is contained in:
Derek McGowan 2016-08-26 18:10:42 -07:00
parent dabdc5e52b
commit a50ce1ab93
1 changed files with 21 additions and 12 deletions
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33
registry/storage/cache/memory/memory.go vendored
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@ -77,37 +77,46 @@ type repositoryScopedInMemoryBlobDescriptorCache struct {
}
func (rsimbdcp *repositoryScopedInMemoryBlobDescriptorCache) Stat(ctx context.Context, dgst digest.Digest) (distribution.Descriptor, error) {
if rsimbdcp.repository == nil {
rsimbdcp.parent.mu.Lock()
repo := rsimbdcp.repository
rsimbdcp.parent.mu.Unlock()
if repo == nil {
return distribution.Descriptor{}, distribution.ErrBlobUnknown
}
return rsimbdcp.repository.Stat(ctx, dgst)
return repo.Stat(ctx, dgst)
}
func (rsimbdcp *repositoryScopedInMemoryBlobDescriptorCache) Clear(ctx context.Context, dgst digest.Digest) error {
if rsimbdcp.repository == nil {
rsimbdcp.parent.mu.Lock()
repo := rsimbdcp.repository
rsimbdcp.parent.mu.Unlock()
if repo == nil {
return distribution.ErrBlobUnknown
}
return rsimbdcp.repository.Clear(ctx, dgst)
return repo.Clear(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()
repo := rsimbdcp.repository
if repo == nil {
// allocate map since we are setting it now.
var ok bool
// have to read back value since we may have allocated elsewhere.
rsimbdcp.repository, ok = rsimbdcp.parent.repositories[rsimbdcp.repo]
repo, ok = rsimbdcp.parent.repositories[rsimbdcp.repo]
if !ok {
rsimbdcp.repository = newMapBlobDescriptorCache()
rsimbdcp.parent.repositories[rsimbdcp.repo] = rsimbdcp.repository
repo = newMapBlobDescriptorCache()
rsimbdcp.parent.repositories[rsimbdcp.repo] = repo
}
rsimbdcp.repository = repo
}
rsimbdcp.parent.mu.Unlock()
}
if err := rsimbdcp.repository.SetDescriptor(ctx, dgst, desc); err != nil {
if err := repo.SetDescriptor(ctx, dgst, desc); err != nil {
return err
}