69 lines
2 KiB
Python
69 lines
2 KiB
Python
import logging
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from peewee import IntegrityError
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from data.model import db_transaction
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from data.database import Blob, BlobPlacementLocation, BlobPlacement
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logger = logging.getLogger(__name__)
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def _ensure_sha256_header(digest):
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if digest.startswith('sha256:'):
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return digest
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return 'sha256:' + digest
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def get_blob(digest):
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""" Find a blob by its digest. """
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return Blob.select().where(Blob.digest == _ensure_sha256_header(digest)).get()
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def get_or_create_blob(digest, size, media_type_name, locations):
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""" Try to find a blob by its digest or create it. """
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# Get or create the blog entry for the digest.
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try:
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blob = get_blob(digest)
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logger.debug('Retrieved blob with digest %s', digest)
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except Blob.DoesNotExist:
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blob = Blob.create(digest=_ensure_sha256_header(digest),
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media_type_id=Blob.media_type.get_id(media_type_name),
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size=size)
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logger.debug('Created blob with digest %s', digest)
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# Add the locations to the blob.
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for location_name in locations:
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location_id = BlobPlacement.location.get_id(location_name)
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try:
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BlobPlacement.create(blob=blob, location=location_id)
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except IntegrityError:
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logger.debug('Location %s already existing for blob %s', location_name, blob.id)
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pass
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return blob
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def get_blob_locations(digest):
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""" Find all locations names for a blob. """
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return [x.name for x in
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BlobPlacementLocation
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.select()
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.join(BlobPlacement)
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.join(Blob)
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.where(Blob.digest == _ensure_sha256_header(digest))]
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def ensure_blob_locations(*names):
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with db_transaction():
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locations = BlobPlacementLocation.select().where(BlobPlacementLocation.name << names)
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insert_names = list(names)
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for location in locations:
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insert_names.remove(location.name)
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if not insert_names:
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return
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data = [{'name': name} for name in insert_names]
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BlobPlacementLocation.insert_many(data).execute()
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