swh.objstorage.replayer.replay module

swh.objstorage.replayer.replay.is_hash_in_bytearray(hash_, array, nb_hashes, hash_size=20)

Checks if the given hash is in the provided array. The array must be a sorted list of sha1 hashes, and contain nb_hashes hashes (so its size must by nb_hashes*hash_size bytes).

Parameters

• hash (bytes) – the hash to look for

• array (bytes) – a sorted concatenated array of hashes (may be of any type supporting slice indexing, eg. mmap.mmap)

• nb_hashes (int) – number of hashes in the array

• hash_size (int) – size of a hash (defaults to 20, for SHA1)

Example:

>>> import os
>>> hash1 = os.urandom(20)
>>> hash2 = os.urandom(20)
>>> hash3 = os.urandom(20)
>>> array = b''.join(sorted([hash1, hash2]))
>>> is_hash_in_bytearray(hash1, array, 2)
True
>>> is_hash_in_bytearray(hash2, array, 2)
True
>>> is_hash_in_bytearray(hash3, array, 2)
False

exception swh.objstorage.replayer.replay.ReplayError(operation, *, obj_id, exc)

Bases: Exception

An error occurred during the replay of an object

swh.objstorage.replayer.replay.log_replay_retry(retry_obj, sleep, last_result)

Log a retry of the content replayer

swh.objstorage.replayer.replay.log_replay_error(last_attempt)

Log a replay error to sentry

swh.objstorage.replayer.replay.copy_object(obj_id, src, dst)

swh.objstorage.replayer.replay.obj_in_objstorage(obj_id, dst)

Check if an object is already in an objstorage, tenaciously

swh.objstorage.replayer.replay.process_replay_objects_content(all_objects: Dict[str, List[dict]], *, src: swh.objstorage.objstorage.ObjStorage, dst: swh.objstorage.objstorage.ObjStorage, exclude_fn: Optional[Callable[[dict], bool]] = None, check_dst: bool = True)

Takes a list of records from Kafka (see swh.journal.client.JournalClient.process()) and copies them from the src objstorage to the dst objstorage, if:

• obj[‘status’] is ‘visible’

• exclude_fn(obj) is False (if exclude_fn is provided)

• obj[‘sha1’] not in dst (if check_dst is True)

Parameters

• all_objects – Objects passed by the Kafka client. Most importantly, all_objects[‘content’][*][‘sha1’] is the sha1 hash of each content.

• src – An object storage (see swh.objstorage.get_objstorage())

• dst – An object storage (see swh.objstorage.get_objstorage())

• exclude_fn – Determines whether an object should be copied.

• check_dst – Determines whether we should check the destination objstorage before copying.

Example:

>>> from swh.objstorage.factory import get_objstorage
>>> src = get_objstorage('memory')
>>> dst = get_objstorage('memory')
>>> id1 = src.add(b'foo bar')
>>> id2 = src.add(b'baz qux')
>>> kafka_partitions = {
...     'content': [
...         {
...             'sha1': id1,
...             'status': 'visible',
...         },
...         {
...             'sha1': id2,
...             'status': 'visible',
...         },
...     ]
... }
>>> process_replay_objects_content(
...     kafka_partitions, src=src, dst=dst,
...     exclude_fn=lambda obj: obj['sha1'] == id1)
>>> id1 in dst
False
>>> id2 in dst
True