268 lines
8.4 KiB
Go
268 lines
8.4 KiB
Go
package redis
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
|
|
"github.com/docker/distribution"
|
|
"github.com/docker/distribution/reference"
|
|
"github.com/docker/distribution/registry/storage/cache"
|
|
"github.com/garyburd/redigo/redis"
|
|
"github.com/opencontainers/go-digest"
|
|
)
|
|
|
|
// redisBlobStatService provides an implementation of
|
|
// BlobDescriptorCacheProvider based on redis. Blob descriptors are stored in
|
|
// two parts. The first provide fast access to repository membership through a
|
|
// redis set for each repo. The second is a redis hash keyed by the digest of
|
|
// the layer, providing path, length and mediatype information. There is also
|
|
// a per-repository redis hash of the blob descriptor, allowing override of
|
|
// data. This is currently used to override the mediatype on a per-repository
|
|
// basis.
|
|
//
|
|
// Note that there is no implied relationship between these two caches. The
|
|
// layer may exist in one, both or none and the code must be written this way.
|
|
type redisBlobDescriptorService struct {
|
|
pool *redis.Pool
|
|
|
|
// TODO(stevvooe): We use a pool because we don't have great control over
|
|
// the cache lifecycle to manage connections. A new connection if fetched
|
|
// for each operation. Once we have better lifecycle management of the
|
|
// request objects, we can change this to a connection.
|
|
}
|
|
|
|
// NewRedisBlobDescriptorCacheProvider returns a new redis-based
|
|
// BlobDescriptorCacheProvider using the provided redis connection pool.
|
|
func NewRedisBlobDescriptorCacheProvider(pool *redis.Pool) cache.BlobDescriptorCacheProvider {
|
|
return &redisBlobDescriptorService{
|
|
pool: pool,
|
|
}
|
|
}
|
|
|
|
// RepositoryScoped returns the scoped cache.
|
|
func (rbds *redisBlobDescriptorService) RepositoryScoped(repo string) (distribution.BlobDescriptorService, error) {
|
|
if _, err := reference.ParseNormalizedNamed(repo); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &repositoryScopedRedisBlobDescriptorService{
|
|
repo: repo,
|
|
upstream: rbds,
|
|
}, nil
|
|
}
|
|
|
|
// Stat retrieves the descriptor data from the redis hash entry.
|
|
func (rbds *redisBlobDescriptorService) Stat(ctx context.Context, dgst digest.Digest) (distribution.Descriptor, error) {
|
|
if err := dgst.Validate(); err != nil {
|
|
return distribution.Descriptor{}, err
|
|
}
|
|
|
|
conn := rbds.pool.Get()
|
|
defer conn.Close()
|
|
|
|
return rbds.stat(ctx, conn, dgst)
|
|
}
|
|
|
|
func (rbds *redisBlobDescriptorService) Clear(ctx context.Context, dgst digest.Digest) error {
|
|
if err := dgst.Validate(); err != nil {
|
|
return err
|
|
}
|
|
|
|
conn := rbds.pool.Get()
|
|
defer conn.Close()
|
|
|
|
// Not atomic in redis <= 2.3
|
|
reply, err := conn.Do("HDEL", rbds.blobDescriptorHashKey(dgst), "digest", "size", "mediatype")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if reply == 0 {
|
|
return distribution.ErrBlobUnknown
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// stat provides an internal stat call that takes a connection parameter. This
|
|
// allows some internal management of the connection scope.
|
|
func (rbds *redisBlobDescriptorService) stat(ctx context.Context, conn redis.Conn, dgst digest.Digest) (distribution.Descriptor, error) {
|
|
reply, err := redis.Values(conn.Do("HMGET", rbds.blobDescriptorHashKey(dgst), "digest", "size", "mediatype"))
|
|
if err != nil {
|
|
return distribution.Descriptor{}, err
|
|
}
|
|
|
|
// NOTE(stevvooe): The "size" field used to be "length". We treat a
|
|
// missing "size" field here as an unknown blob, which causes a cache
|
|
// miss, effectively migrating the field.
|
|
if len(reply) < 3 || reply[0] == nil || reply[1] == nil { // don't care if mediatype is nil
|
|
return distribution.Descriptor{}, distribution.ErrBlobUnknown
|
|
}
|
|
|
|
var desc distribution.Descriptor
|
|
if _, err := redis.Scan(reply, &desc.Digest, &desc.Size, &desc.MediaType); err != nil {
|
|
return distribution.Descriptor{}, err
|
|
}
|
|
|
|
return desc, nil
|
|
}
|
|
|
|
// SetDescriptor sets the descriptor data for the given digest using a redis
|
|
// hash. A hash is used here since we may store unrelated fields about a layer
|
|
// in the future.
|
|
func (rbds *redisBlobDescriptorService) SetDescriptor(ctx context.Context, dgst digest.Digest, desc distribution.Descriptor) error {
|
|
if err := dgst.Validate(); err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := cache.ValidateDescriptor(desc); err != nil {
|
|
return err
|
|
}
|
|
|
|
conn := rbds.pool.Get()
|
|
defer conn.Close()
|
|
|
|
return rbds.setDescriptor(ctx, conn, dgst, desc)
|
|
}
|
|
|
|
func (rbds *redisBlobDescriptorService) setDescriptor(ctx context.Context, conn redis.Conn, dgst digest.Digest, desc distribution.Descriptor) error {
|
|
if _, err := conn.Do("HMSET", rbds.blobDescriptorHashKey(dgst),
|
|
"digest", desc.Digest,
|
|
"size", desc.Size); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Only set mediatype if not already set.
|
|
if _, err := conn.Do("HSETNX", rbds.blobDescriptorHashKey(dgst),
|
|
"mediatype", desc.MediaType); err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (rbds *redisBlobDescriptorService) blobDescriptorHashKey(dgst digest.Digest) string {
|
|
return "blobs::" + dgst.String()
|
|
}
|
|
|
|
type repositoryScopedRedisBlobDescriptorService struct {
|
|
repo string
|
|
upstream *redisBlobDescriptorService
|
|
}
|
|
|
|
var _ distribution.BlobDescriptorService = &repositoryScopedRedisBlobDescriptorService{}
|
|
|
|
// Stat ensures that the digest is a member of the specified repository and
|
|
// forwards the descriptor request to the global blob store. If the media type
|
|
// differs for the repository, we override it.
|
|
func (rsrbds *repositoryScopedRedisBlobDescriptorService) Stat(ctx context.Context, dgst digest.Digest) (distribution.Descriptor, error) {
|
|
if err := dgst.Validate(); err != nil {
|
|
return distribution.Descriptor{}, err
|
|
}
|
|
|
|
conn := rsrbds.upstream.pool.Get()
|
|
defer conn.Close()
|
|
|
|
// Check membership to repository first
|
|
member, err := redis.Bool(conn.Do("SISMEMBER", rsrbds.repositoryBlobSetKey(rsrbds.repo), dgst))
|
|
if err != nil {
|
|
return distribution.Descriptor{}, err
|
|
}
|
|
|
|
if !member {
|
|
return distribution.Descriptor{}, distribution.ErrBlobUnknown
|
|
}
|
|
|
|
upstream, err := rsrbds.upstream.stat(ctx, conn, dgst)
|
|
if err != nil {
|
|
return distribution.Descriptor{}, err
|
|
}
|
|
|
|
// We allow a per repository mediatype, let's look it up here.
|
|
mediatype, err := redis.String(conn.Do("HGET", rsrbds.blobDescriptorHashKey(dgst), "mediatype"))
|
|
if err != nil {
|
|
return distribution.Descriptor{}, err
|
|
}
|
|
|
|
if mediatype != "" {
|
|
upstream.MediaType = mediatype
|
|
}
|
|
|
|
return upstream, nil
|
|
}
|
|
|
|
// Clear removes the descriptor from the cache and forwards to the upstream descriptor store
|
|
func (rsrbds *repositoryScopedRedisBlobDescriptorService) Clear(ctx context.Context, dgst digest.Digest) error {
|
|
if err := dgst.Validate(); err != nil {
|
|
return err
|
|
}
|
|
|
|
conn := rsrbds.upstream.pool.Get()
|
|
defer conn.Close()
|
|
|
|
// Check membership to repository first
|
|
member, err := redis.Bool(conn.Do("SISMEMBER", rsrbds.repositoryBlobSetKey(rsrbds.repo), dgst))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if !member {
|
|
return distribution.ErrBlobUnknown
|
|
}
|
|
|
|
return rsrbds.upstream.Clear(ctx, dgst)
|
|
}
|
|
|
|
func (rsrbds *repositoryScopedRedisBlobDescriptorService) SetDescriptor(ctx context.Context, dgst digest.Digest, desc distribution.Descriptor) error {
|
|
if err := dgst.Validate(); err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := cache.ValidateDescriptor(desc); err != nil {
|
|
return err
|
|
}
|
|
|
|
if dgst != desc.Digest {
|
|
if dgst.Algorithm() == desc.Digest.Algorithm() {
|
|
return fmt.Errorf("redis cache: digest for descriptors differ but algorithm does not: %q != %q", dgst, desc.Digest)
|
|
}
|
|
}
|
|
|
|
conn := rsrbds.upstream.pool.Get()
|
|
defer conn.Close()
|
|
|
|
return rsrbds.setDescriptor(ctx, conn, dgst, desc)
|
|
}
|
|
|
|
func (rsrbds *repositoryScopedRedisBlobDescriptorService) setDescriptor(ctx context.Context, conn redis.Conn, dgst digest.Digest, desc distribution.Descriptor) error {
|
|
if _, err := conn.Do("SADD", rsrbds.repositoryBlobSetKey(rsrbds.repo), dgst); err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := rsrbds.upstream.setDescriptor(ctx, conn, dgst, desc); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Override repository mediatype.
|
|
if _, err := conn.Do("HSET", rsrbds.blobDescriptorHashKey(dgst), "mediatype", desc.MediaType); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Also set the values for the primary descriptor, if they differ by
|
|
// algorithm (ie sha256 vs sha512).
|
|
if desc.Digest != "" && dgst != desc.Digest && dgst.Algorithm() != desc.Digest.Algorithm() {
|
|
if err := rsrbds.setDescriptor(ctx, conn, desc.Digest, desc); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (rsrbds *repositoryScopedRedisBlobDescriptorService) blobDescriptorHashKey(dgst digest.Digest) string {
|
|
return "repository::" + rsrbds.repo + "::blobs::" + dgst.String()
|
|
}
|
|
|
|
func (rsrbds *repositoryScopedRedisBlobDescriptorService) repositoryBlobSetKey(repo string) string {
|
|
return "repository::" + rsrbds.repo + "::blobs"
|
|
}
|