def insertBranchRevisions(self, bzr_branch, revids_to_insert):
"""Insert a batch of BranchRevision rows."""
self.logger.info("Inserting %d branchrevision records.",
len(revids_to_insert))
revid_seq_pairs = revids_to_insert.items()
for revid_seq_pair_chunk in iter_list_chunks(revid_seq_pairs, 10000):
self.db_branch.createBranchRevisionFromIDs(revid_seq_pair_chunk)
def insertBranchRevisions(self, bzr_branch, revids_to_insert):
"""Insert a batch of BranchRevision rows."""
self.logger.info("Inserting %d branchrevision records.",
len(revids_to_insert))
revid_seq_pairs = revids_to_insert.items()
for revid_seq_pair_chunk in iter_list_chunks(revid_seq_pairs, 10000):
self.db_branch.createBranchRevisionFromIDs(revid_seq_pair_chunk)
def syncBranch(self, bzr_branch):
"""Synchronize the database view of a branch with Bazaar data.
`bzr_branch` must be read locked.
Several tables must be updated:
* Revision: there must be one Revision row for each revision in the
branch ancestry. If the row for a revision that has just been added
to the branch is already present, it must be checked for
consistency.
* BranchRevision: there must be one BrancheRevision row for each
revision in the branch ancestry. If history revisions became merged
revisions, the corresponding rows must be changed.
* Branch: the branch-scanner status information must be updated when
the sync is complete.
"""
self.logger.info("Scanning branch: %s", self.db_branch.unique_name)
self.logger.info(" from %s", bzr_branch.base)
# Get the history and ancestry from the branch first, to fail early
# if something is wrong with the branch.
self.logger.info("Retrieving history from bzrlib.")
bzr_history = branch_revision_history(bzr_branch)
# The BranchRevision, Revision and RevisionParent tables are only
# written to by the branch-scanner, so they are not subject to
# write-lock contention. Update them all in a single transaction to
# improve the performance and allow garbage collection in the future.
db_ancestry, db_history = self.retrieveDatabaseAncestry()
(new_ancestry, branchrevisions_to_delete,
revids_to_insert) = self.planDatabaseChanges(bzr_branch, bzr_history,
db_ancestry, db_history)
new_db_revs = (new_ancestry -
getUtility(IRevisionSet).onlyPresent(new_ancestry))
self.logger.info("Adding %s new revisions.", len(new_db_revs))
for revids in iter_list_chunks(list(new_db_revs), 10000):
revisions = self.getBazaarRevisions(bzr_branch, revids)
self.syncRevisions(bzr_branch, revisions, revids_to_insert)
self.deleteBranchRevisions(branchrevisions_to_delete)
self.insertBranchRevisions(bzr_branch, revids_to_insert)
transaction.commit()
# Synchronize the RevisionCache for this branch.
getUtility(IRevisionSet).updateRevisionCacheForBranch(self.db_branch)
transaction.commit()
# Notify any listeners that the tip of the branch has changed, but
# before we've actually updated the database branch.
initial_scan = (len(db_history) == 0)
notify(events.TipChanged(self.db_branch, bzr_branch, initial_scan))
# The Branch table is modified by other systems, including the web UI,
# so we need to update it in a short transaction to avoid causing
# timeouts in the webapp. This opens a small race window where the
# revision data is updated in the database, but the Branch table has
# not been updated. Since this has no ill-effect, and can only err on
# the pessimistic side (tell the user the data has not yet been
# updated although it has), the race is acceptable.
self.updateBranchStatus(bzr_history)
notify(
events.ScanCompleted(self.db_branch, bzr_branch, self.logger,
new_ancestry))
transaction.commit()
def syncBranch(self, bzr_branch):
"""Synchronize the database view of a branch with Bazaar data.
`bzr_branch` must be read locked.
Several tables must be updated:
* Revision: there must be one Revision row for each revision in the
branch ancestry. If the row for a revision that has just been added
to the branch is already present, it must be checked for
consistency.
* BranchRevision: there must be one BrancheRevision row for each
revision in the branch ancestry. If history revisions became merged
revisions, the corresponding rows must be changed.
* Branch: the branch-scanner status information must be updated when
the sync is complete.
"""
self.logger.info("Scanning branch: %s", self.db_branch.unique_name)
self.logger.info(" from %s", bzr_branch.base)
# Get the history and ancestry from the branch first, to fail early
# if something is wrong with the branch.
self.logger.info("Retrieving history from bzrlib.")
bzr_history = branch_revision_history(bzr_branch)
# The BranchRevision, Revision and RevisionParent tables are only
# written to by the branch-scanner, so they are not subject to
# write-lock contention. Update them all in a single transaction to
# improve the performance and allow garbage collection in the future.
db_ancestry, db_history = self.retrieveDatabaseAncestry()
(new_ancestry, branchrevisions_to_delete,
revids_to_insert) = self.planDatabaseChanges(
bzr_branch, bzr_history, db_ancestry, db_history)
new_db_revs = (
new_ancestry - getUtility(IRevisionSet).onlyPresent(new_ancestry))
self.logger.info("Adding %s new revisions.", len(new_db_revs))
for revids in iter_list_chunks(list(new_db_revs), 10000):
revisions = self.getBazaarRevisions(bzr_branch, revids)
self.syncRevisions(bzr_branch, revisions, revids_to_insert)
self.deleteBranchRevisions(branchrevisions_to_delete)
self.insertBranchRevisions(bzr_branch, revids_to_insert)
transaction.commit()
# Synchronize the RevisionCache for this branch.
getUtility(IRevisionSet).updateRevisionCacheForBranch(self.db_branch)
transaction.commit()
# Notify any listeners that the tip of the branch has changed, but
# before we've actually updated the database branch.
initial_scan = (len(db_history) == 0)
notify(events.TipChanged(self.db_branch, bzr_branch, initial_scan))
# The Branch table is modified by other systems, including the web UI,
# so we need to update it in a short transaction to avoid causing
# timeouts in the webapp. This opens a small race window where the
# revision data is updated in the database, but the Branch table has
# not been updated. Since this has no ill-effect, and can only err on
# the pessimistic side (tell the user the data has not yet been
# updated although it has), the race is acceptable.
self.updateBranchStatus(bzr_history)
notify(
events.ScanCompleted(
self.db_branch, bzr_branch, self.logger, new_ancestry))
transaction.commit()
