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utils.py
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utils.py
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# Copyright (C) 2019 The Software Heritage developers
# See the AUTHORS file at the top-level directory of this distribution
# License: GNU General Public License version 3, or any later version
# See top-level LICENSE file for more information
from swh.storage.algos.revisions_walker import get_revisions_walker
def revision_log(storage, rev_id, per_page=1000):
"""Retrieve a revision log in a paginated way in order to avoid storage
timeouts when the total number of revisions to fetch is large.
Args:
storage (swh.storage.storage.Storage): instance of swh storage
(either local or remote)
rev_id (bytes): a revision identifier
per_page (Optional[int]): the maximum number of revisions to return
in each page
Yields:
dict: Revision information as a dictionary
"""
rw_state = {}
nb_revs = 0
max_revs = per_page
while True:
# Get an iterator returning the commits log from rev_id.
# At most max_revs visited revisions from rev_id in the commits graph
# will be returned.
revs_walker = get_revisions_walker('bfs', storage, rev_id,
max_revs=max_revs,
state=rw_state)
# Iterate on at most per_page revisions in the commits log.
for rev in revs_walker:
nb_revs += 1
yield rev
# If the total number of iterated revisions is lesser than the
# maximum requested one, it means that we hit the initial revision
# in the log.
if nb_revs < max_revs:
break
# Backup iterator state to continue the revisions iteration
# from where we left it.
rw_state = revs_walker.export_state()
# Increment the maximum of revisions to iterate from rev_id
# to get next revisions in the log.
max_revs += per_page

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