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Optimize lookup of shared global blobs

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Currently, we only have one (the shared empty layer), but this should make the blob lookups for repositories significantly faster, as we won't need to do the massive join.
This commit is contained in:
Joseph Schorr 2019-02-14 12:46:42 -05:00
parent 7beac643ec
commit f75f315037
6 changed files with 78 additions and 24 deletions
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12
data/model/blob.py
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@ -164,6 +164,18 @@ def initiate_upload(namespace, repo_name, uuid, location_name, storage_metadata)
storage_metadata=storage_metadata)
def get_shared_blob(digest):
""" Returns the ImageStorage blob with the given digest or, if not present,
returns None. This method is *only* to be used for shared blobs that are
globally accessible, such as the special empty gzipped tar layer that Docker
no longer pushes to us.
"""
try:
return ImageStorage.get(content_checksum=digest, uploading=False)
except ImageStorage.DoesNotExist:
return None
def get_or_create_shared_blob(digest, byte_data, storage):
""" Returns the ImageStorage blob with the given digest or, if not present,
adds a row and writes the given byte data to the storage engine.