distribution/docs/storage/registry.go
Richard Scothern d1cb12fa3d Add pull through cache functionality to the Registry which can be configured
with a new `proxy` section in the configuration file.

Create a new registry type which delegates storage to a proxyBlobStore
and proxyManifestStore.  These stores will pull through data if not present
locally.  proxyBlobStore takes care not to write duplicate data to disk.

Add a scheduler to cleanup expired content. The scheduler runs as a background
goroutine.  When a blob or manifest is pulled through from the remote registry,
an entry is added to the scheduler with a TTL.  When the TTL expires the
scheduler calls a pre-specified function to remove the fetched resource.

Add token authentication to the registry middleware.  Get a token at startup
and preload the credential store with the username and password supplied in the
config file.

Allow resumable digest functionality to be disabled at runtime and disable
it when the registry is a pull through cache.

Signed-off-by: Richard Scothern <richard.scothern@gmail.com>
2015-08-04 16:09:55 -07:00

185 lines
5.6 KiB
Go

package storage
import (
"github.com/docker/distribution"
"github.com/docker/distribution/context"
"github.com/docker/distribution/registry/api/v2"
"github.com/docker/distribution/registry/storage/cache"
storagedriver "github.com/docker/distribution/registry/storage/driver"
)
// registry is the top-level implementation of Registry for use in the storage
// package. All instances should descend from this object.
type registry struct {
blobStore *blobStore
blobServer distribution.BlobServer
statter distribution.BlobStatter // global statter service.
blobDescriptorCacheProvider cache.BlobDescriptorCacheProvider
deleteEnabled bool
resumableDigestEnabled bool
}
// NewRegistryWithDriver creates a new registry instance from the provided
// driver. The resulting registry may be shared by multiple goroutines but is
// cheap to allocate. If redirect is true, the backend blob server will
// attempt to use (StorageDriver).URLFor to serve all blobs.
//
// TODO(stevvooe): This function signature is getting very out of hand. Move to
// functional options for instance configuration.
func NewRegistryWithDriver(ctx context.Context, driver storagedriver.StorageDriver, blobDescriptorCacheProvider cache.BlobDescriptorCacheProvider, deleteEnabled bool, redirect bool, isCache bool) distribution.Namespace {
// create global statter, with cache.
var statter distribution.BlobDescriptorService = &blobStatter{
driver: driver,
pm: defaultPathMapper,
}
if blobDescriptorCacheProvider != nil {
statter = cache.NewCachedBlobStatter(blobDescriptorCacheProvider, statter)
}
bs := &blobStore{
driver: driver,
pm: defaultPathMapper,
statter: statter,
}
return &registry{
blobStore: bs,
blobServer: &blobServer{
driver: driver,
statter: statter,
pathFn: bs.path,
redirect: redirect,
},
blobDescriptorCacheProvider: blobDescriptorCacheProvider,
deleteEnabled: deleteEnabled,
resumableDigestEnabled: !isCache,
}
}
// Scope returns the namespace scope for a registry. The registry
// will only serve repositories contained within this scope.
func (reg *registry) Scope() distribution.Scope {
return distribution.GlobalScope
}
// Repository returns an instance of the repository tied to the registry.
// Instances should not be shared between goroutines but are cheap to
// allocate. In general, they should be request scoped.
func (reg *registry) Repository(ctx context.Context, name string) (distribution.Repository, error) {
if err := v2.ValidateRepositoryName(name); err != nil {
return nil, distribution.ErrRepositoryNameInvalid{
Name: name,
Reason: err,
}
}
var descriptorCache distribution.BlobDescriptorService
if reg.blobDescriptorCacheProvider != nil {
var err error
descriptorCache, err = reg.blobDescriptorCacheProvider.RepositoryScoped(name)
if err != nil {
return nil, err
}
}
return &repository{
ctx: ctx,
registry: reg,
name: name,
descriptorCache: descriptorCache,
}, nil
}
// repository provides name-scoped access to various services.
type repository struct {
*registry
ctx context.Context
name string
descriptorCache distribution.BlobDescriptorService
}
// Name returns the name of the repository.
func (repo *repository) Name() string {
return repo.name
}
// Manifests returns an instance of ManifestService. Instantiation is cheap and
// may be context sensitive in the future. The instance should be used similar
// to a request local.
func (repo *repository) Manifests(ctx context.Context, options ...distribution.ManifestServiceOption) (distribution.ManifestService, error) {
ms := &manifestStore{
ctx: ctx,
repository: repo,
revisionStore: &revisionStore{
ctx: ctx,
repository: repo,
blobStore: &linkedBlobStore{
ctx: ctx,
blobStore: repo.blobStore,
repository: repo,
deleteEnabled: repo.registry.deleteEnabled,
blobAccessController: &linkedBlobStatter{
blobStore: repo.blobStore,
repository: repo,
linkPath: manifestRevisionLinkPath,
},
// TODO(stevvooe): linkPath limits this blob store to only
// manifests. This instance cannot be used for blob checks.
linkPath: manifestRevisionLinkPath,
},
},
tagStore: &tagStore{
ctx: ctx,
repository: repo,
blobStore: repo.registry.blobStore,
},
}
// Apply options
for _, option := range options {
err := option(ms)
if err != nil {
return nil, err
}
}
return ms, nil
}
// Blobs returns an instance of the BlobStore. Instantiation is cheap and
// may be context sensitive in the future. The instance should be used similar
// to a request local.
func (repo *repository) Blobs(ctx context.Context) distribution.BlobStore {
var statter distribution.BlobDescriptorService = &linkedBlobStatter{
blobStore: repo.blobStore,
repository: repo,
linkPath: blobLinkPath,
}
if repo.descriptorCache != nil {
statter = cache.NewCachedBlobStatter(repo.descriptorCache, statter)
}
return &linkedBlobStore{
blobStore: repo.blobStore,
blobServer: repo.blobServer,
blobAccessController: statter,
repository: repo,
ctx: ctx,
// TODO(stevvooe): linkPath limits this blob store to only layers.
// This instance cannot be used for manifest checks.
linkPath: blobLinkPath,
deleteEnabled: repo.registry.deleteEnabled,
}
}
func (repo *repository) Signatures() distribution.SignatureService {
return &signatureStore{
repository: repo,
blobStore: repo.blobStore,
ctx: repo.ctx,
}
}