73 lines
2 KiB
Go
73 lines
2 KiB
Go
package store
|
|
|
|
import (
|
|
"github.com/lbryio/lbry.go/v2/extras/errors"
|
|
"github.com/lbryio/lbry.go/v2/stream"
|
|
)
|
|
|
|
// CachingBlobStore combines two stores, typically a local and a remote store, to improve performance.
|
|
// Accessed blobs are stored in and retrieved from the cache. If they are not in the cache, they
|
|
// are retrieved from the origin and cached. Puts are cached and also forwarded to the origin.
|
|
type CachingBlobStore struct {
|
|
origin, cache BlobStore
|
|
}
|
|
|
|
// NewCachingBlobStore makes a new caching disk store and returns a pointer to it.
|
|
func NewCachingBlobStore(origin, cache BlobStore) *CachingBlobStore {
|
|
return &CachingBlobStore{origin: origin, cache: cache}
|
|
}
|
|
|
|
// Has checks the cache and then the origin for a hash. It returns true if either store has it.
|
|
func (c *CachingBlobStore) Has(hash string) (bool, error) {
|
|
has, err := c.cache.Has(hash)
|
|
if has || err != nil {
|
|
return has, err
|
|
}
|
|
return c.origin.Has(hash)
|
|
}
|
|
|
|
// Get tries to get the blob from the cache first, falling back to the origin. If the blob comes
|
|
// from the origin, it is also stored in the cache.
|
|
func (c *CachingBlobStore) Get(hash string) (stream.Blob, error) {
|
|
blob, err := c.cache.Get(hash)
|
|
if err == nil || !errors.Is(err, ErrBlobNotFound) {
|
|
return blob, err
|
|
}
|
|
|
|
blob, err = c.origin.Get(hash)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
err = c.cache.Put(hash, blob)
|
|
|
|
return blob, err
|
|
}
|
|
|
|
// Put stores the blob in the origin and the cache
|
|
func (c *CachingBlobStore) Put(hash string, blob stream.Blob) error {
|
|
err := c.origin.Put(hash, blob)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return c.cache.Put(hash, blob)
|
|
}
|
|
|
|
// PutSD stores the sd blob in the origin and the cache
|
|
func (c *CachingBlobStore) PutSD(hash string, blob stream.Blob) error {
|
|
err := c.origin.PutSD(hash, blob)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return c.cache.PutSD(hash, blob)
|
|
}
|
|
|
|
// Delete deletes the blob from the origin and the cache
|
|
func (c *CachingBlobStore) Delete(hash string) error {
|
|
err := c.origin.Delete(hash)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return c.cache.Delete(hash)
|
|
}
|