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# branchmap.py - logic to computes, maintain and stores branchmap for local repo
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#
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# Copyright 2005-2007 Olivia Mackall <olivia@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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import struct
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from .node import (
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bin,
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hex,
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nullrev,
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)
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from . import (
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encoding,
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error,
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pycompat,
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scmutil,
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util,
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)
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from .utils import (
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repoviewutil,
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stringutil,
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)
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if pycompat.TYPE_CHECKING:
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from typing import (
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Any,
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Callable,
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Dict,
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Iterable,
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List,
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Optional,
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Set,
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Tuple,
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Union,
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)
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from . import localrepo
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assert any(
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(
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Any,
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Callable,
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Dict,
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Iterable,
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List,
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Optional,
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Set,
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Tuple,
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Union,
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localrepo,
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)
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)
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subsettable = repoviewutil.subsettable
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calcsize = struct.calcsize
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pack_into = struct.pack_into
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unpack_from = struct.unpack_from
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class BranchMapCache(object):
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"""mapping of filtered views of repo with their branchcache"""
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def __init__(self):
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self._per_filter = {}
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def __getitem__(self, repo):
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self.updatecache(repo)
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return self._per_filter[repo.filtername]
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def updatecache(self, repo):
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"""Update the cache for the given filtered view on a repository"""
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# This can trigger updates for the caches for subsets of the filtered
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# view, e.g. when there is no cache for this filtered view or the cache
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# is stale.
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cl = repo.changelog
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filtername = repo.filtername
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bcache = self._per_filter.get(filtername)
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if bcache is None or not bcache.validfor(repo):
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# cache object missing or cache object stale? Read from disk
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bcache = branchcache.fromfile(repo)
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revs = []
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if bcache is None:
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# no (fresh) cache available anymore, perhaps we can re-use
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# the cache for a subset, then extend that to add info on missing
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# revisions.
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subsetname = subsettable.get(filtername)
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if subsetname is not None:
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subset = repo.filtered(subsetname)
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bcache = self[subset].copy()
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extrarevs = subset.changelog.filteredrevs - cl.filteredrevs
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revs.extend(r for r in extrarevs if r <= bcache.tiprev)
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else:
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# nothing to fall back on, start empty.
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bcache = branchcache(repo)
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revs.extend(cl.revs(start=bcache.tiprev + 1))
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if revs:
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bcache.update(repo, revs)
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assert bcache.validfor(repo), filtername
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self._per_filter[repo.filtername] = bcache
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def replace(self, repo, remotebranchmap):
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"""Replace the branchmap cache for a repo with a branch mapping.
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This is likely only called during clone with a branch map from a
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remote.
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"""
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cl = repo.changelog
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clrev = cl.rev
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clbranchinfo = cl.branchinfo
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rbheads = []
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closed = set()
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for bheads in pycompat.itervalues(remotebranchmap):
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rbheads += bheads
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for h in bheads:
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r = clrev(h)
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b, c = clbranchinfo(r)
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if c:
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closed.add(h)
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if rbheads:
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rtiprev = max((int(clrev(node)) for node in rbheads))
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cache = branchcache(
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repo,
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remotebranchmap,
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repo[rtiprev].node(),
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rtiprev,
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closednodes=closed,
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)
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# Try to stick it as low as possible
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# filter above served are unlikely to be fetch from a clone
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for candidate in (b'base', b'immutable', b'served'):
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rview = repo.filtered(candidate)
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if cache.validfor(rview):
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self._per_filter[candidate] = cache
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cache.write(rview)
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return
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def clear(self):
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self._per_filter.clear()
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def _unknownnode(node):
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"""raises ValueError when branchcache found a node which does not exists"""
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raise ValueError('node %s does not exist' % pycompat.sysstr(hex(node)))
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def _branchcachedesc(repo):
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if repo.filtername is not None:
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return b'branch cache (%s)' % repo.filtername
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else:
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return b'branch cache'
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class branchcache(object):
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"""A dict like object that hold branches heads cache.
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This cache is used to avoid costly computations to determine all the
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branch heads of a repo.
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The cache is serialized on disk in the following format:
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<tip hex node> <tip rev number> [optional filtered repo hex hash]
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<branch head hex node> <open/closed state> <branch name>
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<branch head hex node> <open/closed state> <branch name>
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...
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The first line is used to check if the cache is still valid. If the
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branch cache is for a filtered repo view, an optional third hash is
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included that hashes the hashes of all filtered revisions.
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The open/closed state is represented by a single letter 'o' or 'c'.
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This field can be used to avoid changelog reads when determining if a
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branch head closes a branch or not.
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"""
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def __init__(
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self,
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repo,
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entries=(),
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tipnode=None,
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tiprev=nullrev,
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filteredhash=None,
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closednodes=None,
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hasnode=None,
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):
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# type: (localrepo.localrepository, Union[Dict[bytes, List[bytes]], Iterable[Tuple[bytes, List[bytes]]]], bytes, int, Optional[bytes], Optional[Set[bytes]], Optional[Callable[[bytes], bool]]) -> None
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"""hasnode is a function which can be used to verify whether changelog
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has a given node or not. If it's not provided, we assume that every node
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we have exists in changelog"""
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self._repo = repo
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if tipnode is None:
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self.tipnode = repo.nullid
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else:
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self.tipnode = tipnode
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self.tiprev = tiprev
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self.filteredhash = filteredhash
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# closednodes is a set of nodes that close their branch. If the branch
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# cache has been updated, it may contain nodes that are no longer
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# heads.
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if closednodes is None:
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self._closednodes = set()
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else:
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self._closednodes = closednodes
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self._entries = dict(entries)
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# whether closed nodes are verified or not
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self._closedverified = False
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# branches for which nodes are verified
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self._verifiedbranches = set()
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self._hasnode = hasnode
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if self._hasnode is None:
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self._hasnode = lambda x: True
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def _verifyclosed(self):
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"""verify the closed nodes we have"""
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if self._closedverified:
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return
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for node in self._closednodes:
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if not self._hasnode(node):
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_unknownnode(node)
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self._closedverified = True
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def _verifybranch(self, branch):
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"""verify head nodes for the given branch."""
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if branch not in self._entries or branch in self._verifiedbranches:
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return
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for n in self._entries[branch]:
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if not self._hasnode(n):
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_unknownnode(n)
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self._verifiedbranches.add(branch)
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def _verifyall(self):
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"""verifies nodes of all the branches"""
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needverification = set(self._entries.keys()) - self._verifiedbranches
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for b in needverification:
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self._verifybranch(b)
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def __iter__(self):
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return iter(self._entries)
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def __setitem__(self, key, value):
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self._entries[key] = value
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def __getitem__(self, key):
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self._verifybranch(key)
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return self._entries[key]
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def __contains__(self, key):
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self._verifybranch(key)
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return key in self._entries
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def iteritems(self):
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for k, v in pycompat.iteritems(self._entries):
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self._verifybranch(k)
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yield k, v
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items = iteritems
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def hasbranch(self, label):
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"""checks whether a branch of this name exists or not"""
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self._verifybranch(label)
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return label in self._entries
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@classmethod
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def fromfile(cls, repo):
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f = None
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try:
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f = repo.cachevfs(cls._filename(repo))
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lineiter = iter(f)
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cachekey = next(lineiter).rstrip(b'\n').split(b" ", 2)
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last, lrev = cachekey[:2]
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last, lrev = bin(last), int(lrev)
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filteredhash = None
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hasnode = repo.changelog.hasnode
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if len(cachekey) > 2:
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filteredhash = bin(cachekey[2])
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bcache = cls(
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repo,
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tipnode=last,
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tiprev=lrev,
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filteredhash=filteredhash,
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hasnode=hasnode,
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)
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if not bcache.validfor(repo):
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# invalidate the cache
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raise ValueError('tip differs')
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bcache.load(repo, lineiter)
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except (IOError, OSError):
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return None
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except Exception as inst:
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if repo.ui.debugflag:
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msg = b'invalid %s: %s\n'
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repo.ui.debug(
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msg
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% (
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_branchcachedesc(repo),
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stringutil.forcebytestr(inst),
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)
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)
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bcache = None
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finally:
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if f:
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f.close()
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return bcache
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def load(self, repo, lineiter):
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"""fully loads the branchcache by reading from the file using the line
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iterator passed"""
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for line in lineiter:
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line = line.rstrip(b'\n')
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if not line:
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continue
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node, state, label = line.split(b" ", 2)
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if state not in b'oc':
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raise ValueError('invalid branch state')
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label = encoding.tolocal(label.strip())
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node = bin(node)
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self._entries.setdefault(label, []).append(node)
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if state == b'c':
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self._closednodes.add(node)
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@staticmethod
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def _filename(repo):
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"""name of a branchcache file for a given repo or repoview"""
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filename = b"branch2"
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if repo.filtername:
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filename = b'%s-%s' % (filename, repo.filtername)
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return filename
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def validfor(self, repo):
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"""Is the cache content valid regarding a repo
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- False when cached tipnode is unknown or if we detect a strip.
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- True when cache is up to date or a subset of current repo."""
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try:
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return (self.tipnode == repo.changelog.node(self.tiprev)) and (
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self.filteredhash == scmutil.filteredhash(repo, self.tiprev)
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)
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except IndexError:
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return False
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def _branchtip(self, heads):
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"""Return tuple with last open head in heads and false,
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otherwise return last closed head and true."""
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tip = heads[-1]
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closed = True
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for h in reversed(heads):
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if h not in self._closednodes:
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tip = h
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closed = False
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break
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return tip, closed
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def branchtip(self, branch):
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"""Return the tipmost open head on branch head, otherwise return the
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tipmost closed head on branch.
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Raise KeyError for unknown branch."""
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return self._branchtip(self[branch])[0]
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def iteropen(self, nodes):
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return (n for n in nodes if n not in self._closednodes)
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def branchheads(self, branch, closed=False):
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self._verifybranch(branch)
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heads = self._entries[branch]
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if not closed:
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heads = list(self.iteropen(heads))
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return heads
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def iterbranches(self):
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for bn, heads in pycompat.iteritems(self):
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yield (bn, heads) + self._branchtip(heads)
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def iterheads(self):
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"""returns all the heads"""
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self._verifyall()
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return pycompat.itervalues(self._entries)
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def copy(self):
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"""return an deep copy of the branchcache object"""
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return type(self)(
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self._repo,
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self._entries,
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self.tipnode,
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self.tiprev,
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self.filteredhash,
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self._closednodes,
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)
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def write(self, repo):
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try:
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f = repo.cachevfs(self._filename(repo), b"w", atomictemp=True)
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cachekey = [hex(self.tipnode), b'%d' % self.tiprev]
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if self.filteredhash is not None:
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cachekey.append(hex(self.filteredhash))
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f.write(b" ".join(cachekey) + b'\n')
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nodecount = 0
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for label, nodes in sorted(pycompat.iteritems(self._entries)):
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label = encoding.fromlocal(label)
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for node in nodes:
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nodecount += 1
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if node in self._closednodes:
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state = b'c'
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else:
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state = b'o'
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f.write(b"%s %s %s\n" % (hex(node), state, label))
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f.close()
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repo.ui.log(
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b'branchcache',
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b'wrote %s with %d labels and %d nodes\n',
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_branchcachedesc(repo),
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len(self._entries),
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nodecount,
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)
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except (IOError, OSError, error.Abort) as inst:
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# Abort may be raised by read only opener, so log and continue
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repo.ui.debug(
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b"couldn't write branch cache: %s\n"
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% stringutil.forcebytestr(inst)
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)
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def update(self, repo, revgen):
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"""Given a branchhead cache, self, that may have extra nodes or be
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missing heads, and a generator of nodes that are strictly a superset of
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heads missing, this function updates self to be correct.
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"""
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starttime = util.timer()
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cl = repo.changelog
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# collect new branch entries
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newbranches = {}
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getbranchinfo = repo.revbranchcache().branchinfo
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for r in revgen:
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branch, closesbranch = getbranchinfo(r)
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newbranches.setdefault(branch, []).append(r)
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if closesbranch:
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self._closednodes.add(cl.node(r))
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# new tip revision which we found after iterating items from new
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# branches
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ntiprev = self.tiprev
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# Delay fetching the topological heads until they are needed.
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# A repository without non-continous branches can skip this part.
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topoheads = None
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# If a changeset is visible, its parents must be visible too, so
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# use the faster unfiltered parent accessor.
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parentrevs = repo.unfiltered().changelog.parentrevs
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for branch, newheadrevs in pycompat.iteritems(newbranches):
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# For every branch, compute the new branchheads.
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# A branchhead is a revision such that no descendant is on
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|
# the same branch.
|
|
|
#
|
|
|
# The branchheads are computed iteratively in revision order.
|
|
|
# This ensures topological order, i.e. parents are processed
|
|
|
# before their children. Ancestors are inclusive here, i.e.
|
|
|
# any revision is an ancestor of itself.
|
|
|
#
|
|
|
# Core observations:
|
|
|
# - The current revision is always a branchhead for the
|
|
|
# repository up to that point.
|
|
|
# - It is the first revision of the branch if and only if
|
|
|
# there was no branchhead before. In that case, it is the
|
|
|
# only branchhead as there are no possible ancestors on
|
|
|
# the same branch.
|
|
|
# - If a parent is on the same branch, a branchhead can
|
|
|
# only be an ancestor of that parent, if it is parent
|
|
|
# itself. Otherwise it would have been removed as ancestor
|
|
|
# of that parent before.
|
|
|
# - Therefore, if all parents are on the same branch, they
|
|
|
# can just be removed from the branchhead set.
|
|
|
# - If one parent is on the same branch and the other is not
|
|
|
# and there was exactly one branchhead known, the existing
|
|
|
# branchhead can only be an ancestor if it is the parent.
|
|
|
# Otherwise it would have been removed as ancestor of
|
|
|
# the parent before. The other parent therefore can't have
|
|
|
# a branchhead as ancestor.
|
|
|
# - In all other cases, the parents on different branches
|
|
|
# could have a branchhead as ancestor. Those parents are
|
|
|
# kept in the "uncertain" set. If all branchheads are also
|
|
|
# topological heads, they can't have descendants and further
|
|
|
# checks can be skipped. Otherwise, the ancestors of the
|
|
|
# "uncertain" set are removed from branchheads.
|
|
|
# This computation is heavy and avoided if at all possible.
|
|
|
bheads = self._entries.setdefault(branch, [])
|
|
|
bheadset = {cl.rev(node) for node in bheads}
|
|
|
uncertain = set()
|
|
|
for newrev in sorted(newheadrevs):
|
|
|
if not bheadset:
|
|
|
bheadset.add(newrev)
|
|
|
continue
|
|
|
|
|
|
parents = [p for p in parentrevs(newrev) if p != nullrev]
|
|
|
samebranch = set()
|
|
|
otherbranch = set()
|
|
|
for p in parents:
|
|
|
if p in bheadset or getbranchinfo(p)[0] == branch:
|
|
|
samebranch.add(p)
|
|
|
else:
|
|
|
otherbranch.add(p)
|
|
|
if otherbranch and not (len(bheadset) == len(samebranch) == 1):
|
|
|
uncertain.update(otherbranch)
|
|
|
bheadset.difference_update(samebranch)
|
|
|
bheadset.add(newrev)
|
|
|
|
|
|
if uncertain:
|
|
|
if topoheads is None:
|
|
|
topoheads = set(cl.headrevs())
|
|
|
if bheadset - topoheads:
|
|
|
floorrev = min(bheadset)
|
|
|
ancestors = set(cl.ancestors(newheadrevs, floorrev))
|
|
|
bheadset -= ancestors
|
|
|
bheadrevs = sorted(bheadset)
|
|
|
self[branch] = [cl.node(rev) for rev in bheadrevs]
|
|
|
tiprev = bheadrevs[-1]
|
|
|
if tiprev > ntiprev:
|
|
|
ntiprev = tiprev
|
|
|
|
|
|
if ntiprev > self.tiprev:
|
|
|
self.tiprev = ntiprev
|
|
|
self.tipnode = cl.node(ntiprev)
|
|
|
|
|
|
if not self.validfor(repo):
|
|
|
# cache key are not valid anymore
|
|
|
self.tipnode = repo.nullid
|
|
|
self.tiprev = nullrev
|
|
|
for heads in self.iterheads():
|
|
|
tiprev = max(cl.rev(node) for node in heads)
|
|
|
if tiprev > self.tiprev:
|
|
|
self.tipnode = cl.node(tiprev)
|
|
|
self.tiprev = tiprev
|
|
|
self.filteredhash = scmutil.filteredhash(repo, self.tiprev)
|
|
|
|
|
|
duration = util.timer() - starttime
|
|
|
repo.ui.log(
|
|
|
b'branchcache',
|
|
|
b'updated %s in %.4f seconds\n',
|
|
|
_branchcachedesc(repo),
|
|
|
duration,
|
|
|
)
|
|
|
|
|
|
self.write(repo)
|
|
|
|
|
|
|
|
|
class remotebranchcache(branchcache):
|
|
|
"""Branchmap info for a remote connection, should not write locally"""
|
|
|
|
|
|
def write(self, repo):
|
|
|
pass
|
|
|
|
|
|
|
|
|
# Revision branch info cache
|
|
|
|
|
|
_rbcversion = b'-v1'
|
|
|
_rbcnames = b'rbc-names' + _rbcversion
|
|
|
_rbcrevs = b'rbc-revs' + _rbcversion
|
|
|
# [4 byte hash prefix][4 byte branch name number with sign bit indicating open]
|
|
|
_rbcrecfmt = b'>4sI'
|
|
|
_rbcrecsize = calcsize(_rbcrecfmt)
|
|
|
_rbcmininc = 64 * _rbcrecsize
|
|
|
_rbcnodelen = 4
|
|
|
_rbcbranchidxmask = 0x7FFFFFFF
|
|
|
_rbccloseflag = 0x80000000
|
|
|
|
|
|
|
|
|
class revbranchcache(object):
|
|
|
"""Persistent cache, mapping from revision number to branch name and close.
|
|
|
This is a low level cache, independent of filtering.
|
|
|
|
|
|
Branch names are stored in rbc-names in internal encoding separated by 0.
|
|
|
rbc-names is append-only, and each branch name is only stored once and will
|
|
|
thus have a unique index.
|
|
|
|
|
|
The branch info for each revision is stored in rbc-revs as constant size
|
|
|
records. The whole file is read into memory, but it is only 'parsed' on
|
|
|
demand. The file is usually append-only but will be truncated if repo
|
|
|
modification is detected.
|
|
|
The record for each revision contains the first 4 bytes of the
|
|
|
corresponding node hash, and the record is only used if it still matches.
|
|
|
Even a completely trashed rbc-revs fill thus still give the right result
|
|
|
while converging towards full recovery ... assuming no incorrectly matching
|
|
|
node hashes.
|
|
|
The record also contains 4 bytes where 31 bits contains the index of the
|
|
|
branch and the last bit indicate that it is a branch close commit.
|
|
|
The usage pattern for rbc-revs is thus somewhat similar to 00changelog.i
|
|
|
and will grow with it but be 1/8th of its size.
|
|
|
"""
|
|
|
|
|
|
def __init__(self, repo, readonly=True):
|
|
|
assert repo.filtername is None
|
|
|
self._repo = repo
|
|
|
self._names = [] # branch names in local encoding with static index
|
|
|
self._rbcrevs = bytearray()
|
|
|
self._rbcsnameslen = 0 # length of names read at _rbcsnameslen
|
|
|
try:
|
|
|
bndata = repo.cachevfs.read(_rbcnames)
|
|
|
self._rbcsnameslen = len(bndata) # for verification before writing
|
|
|
if bndata:
|
|
|
self._names = [
|
|
|
encoding.tolocal(bn) for bn in bndata.split(b'\0')
|
|
|
]
|
|
|
except (IOError, OSError):
|
|
|
if readonly:
|
|
|
# don't try to use cache - fall back to the slow path
|
|
|
self.branchinfo = self._branchinfo
|
|
|
|
|
|
if self._names:
|
|
|
try:
|
|
|
data = repo.cachevfs.read(_rbcrevs)
|
|
|
self._rbcrevs[:] = data
|
|
|
except (IOError, OSError) as inst:
|
|
|
repo.ui.debug(
|
|
|
b"couldn't read revision branch cache: %s\n"
|
|
|
% stringutil.forcebytestr(inst)
|
|
|
)
|
|
|
# remember number of good records on disk
|
|
|
self._rbcrevslen = min(
|
|
|
len(self._rbcrevs) // _rbcrecsize, len(repo.changelog)
|
|
|
)
|
|
|
if self._rbcrevslen == 0:
|
|
|
self._names = []
|
|
|
self._rbcnamescount = len(self._names) # number of names read at
|
|
|
# _rbcsnameslen
|
|
|
|
|
|
def _clear(self):
|
|
|
self._rbcsnameslen = 0
|
|
|
del self._names[:]
|
|
|
self._rbcnamescount = 0
|
|
|
self._rbcrevslen = len(self._repo.changelog)
|
|
|
self._rbcrevs = bytearray(self._rbcrevslen * _rbcrecsize)
|
|
|
util.clearcachedproperty(self, b'_namesreverse')
|
|
|
|
|
|
@util.propertycache
|
|
|
def _namesreverse(self):
|
|
|
return {b: r for r, b in enumerate(self._names)}
|
|
|
|
|
|
def branchinfo(self, rev):
|
|
|
"""Return branch name and close flag for rev, using and updating
|
|
|
persistent cache."""
|
|
|
changelog = self._repo.changelog
|
|
|
rbcrevidx = rev * _rbcrecsize
|
|
|
|
|
|
# avoid negative index, changelog.read(nullrev) is fast without cache
|
|
|
if rev == nullrev:
|
|
|
return changelog.branchinfo(rev)
|
|
|
|
|
|
# if requested rev isn't allocated, grow and cache the rev info
|
|
|
if len(self._rbcrevs) < rbcrevidx + _rbcrecsize:
|
|
|
return self._branchinfo(rev)
|
|
|
|
|
|
# fast path: extract data from cache, use it if node is matching
|
|
|
reponode = changelog.node(rev)[:_rbcnodelen]
|
|
|
cachenode, branchidx = unpack_from(
|
|
|
_rbcrecfmt, util.buffer(self._rbcrevs), rbcrevidx
|
|
|
)
|
|
|
close = bool(branchidx & _rbccloseflag)
|
|
|
if close:
|
|
|
branchidx &= _rbcbranchidxmask
|
|
|
if cachenode == b'\0\0\0\0':
|
|
|
pass
|
|
|
elif cachenode == reponode:
|
|
|
try:
|
|
|
return self._names[branchidx], close
|
|
|
except IndexError:
|
|
|
# recover from invalid reference to unknown branch
|
|
|
self._repo.ui.debug(
|
|
|
b"referenced branch names not found"
|
|
|
b" - rebuilding revision branch cache from scratch\n"
|
|
|
)
|
|
|
self._clear()
|
|
|
else:
|
|
|
# rev/node map has changed, invalidate the cache from here up
|
|
|
self._repo.ui.debug(
|
|
|
b"history modification detected - truncating "
|
|
|
b"revision branch cache to revision %d\n" % rev
|
|
|
)
|
|
|
truncate = rbcrevidx + _rbcrecsize
|
|
|
del self._rbcrevs[truncate:]
|
|
|
self._rbcrevslen = min(self._rbcrevslen, truncate)
|
|
|
|
|
|
# fall back to slow path and make sure it will be written to disk
|
|
|
return self._branchinfo(rev)
|
|
|
|
|
|
def _branchinfo(self, rev):
|
|
|
"""Retrieve branch info from changelog and update _rbcrevs"""
|
|
|
changelog = self._repo.changelog
|
|
|
b, close = changelog.branchinfo(rev)
|
|
|
if b in self._namesreverse:
|
|
|
branchidx = self._namesreverse[b]
|
|
|
else:
|
|
|
branchidx = len(self._names)
|
|
|
self._names.append(b)
|
|
|
self._namesreverse[b] = branchidx
|
|
|
reponode = changelog.node(rev)
|
|
|
if close:
|
|
|
branchidx |= _rbccloseflag
|
|
|
self._setcachedata(rev, reponode, branchidx)
|
|
|
return b, close
|
|
|
|
|
|
def setdata(self, rev, changelogrevision):
|
|
|
"""add new data information to the cache"""
|
|
|
branch, close = changelogrevision.branchinfo
|
|
|
|
|
|
if branch in self._namesreverse:
|
|
|
branchidx = self._namesreverse[branch]
|
|
|
else:
|
|
|
branchidx = len(self._names)
|
|
|
self._names.append(branch)
|
|
|
self._namesreverse[branch] = branchidx
|
|
|
if close:
|
|
|
branchidx |= _rbccloseflag
|
|
|
self._setcachedata(rev, self._repo.changelog.node(rev), branchidx)
|
|
|
# If no cache data were readable (non exists, bad permission, etc)
|
|
|
# the cache was bypassing itself by setting:
|
|
|
#
|
|
|
# self.branchinfo = self._branchinfo
|
|
|
#
|
|
|
# Since we now have data in the cache, we need to drop this bypassing.
|
|
|
if 'branchinfo' in vars(self):
|
|
|
del self.branchinfo
|
|
|
|
|
|
def _setcachedata(self, rev, node, branchidx):
|
|
|
"""Writes the node's branch data to the in-memory cache data."""
|
|
|
if rev == nullrev:
|
|
|
return
|
|
|
rbcrevidx = rev * _rbcrecsize
|
|
|
requiredsize = rbcrevidx + _rbcrecsize
|
|
|
rbccur = len(self._rbcrevs)
|
|
|
if rbccur < requiredsize:
|
|
|
# bytearray doesn't allocate extra space at least in Python 3.7.
|
|
|
# When multiple changesets are added in a row, precise resize would
|
|
|
# result in quadratic complexity. Overallocate to compensate by
|
|
|
# use the classic doubling technique for dynamic arrays instead.
|
|
|
# If there was a gap in the map before, less space will be reserved.
|
|
|
self._rbcrevs.extend(b'\0' * max(_rbcmininc, requiredsize))
|
|
|
pack_into(_rbcrecfmt, self._rbcrevs, rbcrevidx, node, branchidx)
|
|
|
self._rbcrevslen = min(self._rbcrevslen, rev)
|
|
|
|
|
|
tr = self._repo.currenttransaction()
|
|
|
if tr:
|
|
|
tr.addfinalize(b'write-revbranchcache', self.write)
|
|
|
|
|
|
def write(self, tr=None):
|
|
|
"""Save branch cache if it is dirty."""
|
|
|
repo = self._repo
|
|
|
wlock = None
|
|
|
step = b''
|
|
|
try:
|
|
|
# write the new names
|
|
|
if self._rbcnamescount < len(self._names):
|
|
|
wlock = repo.wlock(wait=False)
|
|
|
step = b' names'
|
|
|
self._writenames(repo)
|
|
|
|
|
|
# write the new revs
|
|
|
start = self._rbcrevslen * _rbcrecsize
|
|
|
if start != len(self._rbcrevs):
|
|
|
step = b''
|
|
|
if wlock is None:
|
|
|
wlock = repo.wlock(wait=False)
|
|
|
self._writerevs(repo, start)
|
|
|
|
|
|
except (IOError, OSError, error.Abort, error.LockError) as inst:
|
|
|
repo.ui.debug(
|
|
|
b"couldn't write revision branch cache%s: %s\n"
|
|
|
% (step, stringutil.forcebytestr(inst))
|
|
|
)
|
|
|
finally:
|
|
|
if wlock is not None:
|
|
|
wlock.release()
|
|
|
|
|
|
def _writenames(self, repo):
|
|
|
"""write the new branch names to revbranchcache"""
|
|
|
if self._rbcnamescount != 0:
|
|
|
f = repo.cachevfs.open(_rbcnames, b'ab')
|
|
|
if f.tell() == self._rbcsnameslen:
|
|
|
f.write(b'\0')
|
|
|
else:
|
|
|
f.close()
|
|
|
repo.ui.debug(b"%s changed - rewriting it\n" % _rbcnames)
|
|
|
self._rbcnamescount = 0
|
|
|
self._rbcrevslen = 0
|
|
|
if self._rbcnamescount == 0:
|
|
|
# before rewriting names, make sure references are removed
|
|
|
repo.cachevfs.unlinkpath(_rbcrevs, ignoremissing=True)
|
|
|
f = repo.cachevfs.open(_rbcnames, b'wb')
|
|
|
f.write(
|
|
|
b'\0'.join(
|
|
|
encoding.fromlocal(b)
|
|
|
for b in self._names[self._rbcnamescount :]
|
|
|
)
|
|
|
)
|
|
|
self._rbcsnameslen = f.tell()
|
|
|
f.close()
|
|
|
self._rbcnamescount = len(self._names)
|
|
|
|
|
|
def _writerevs(self, repo, start):
|
|
|
"""write the new revs to revbranchcache"""
|
|
|
revs = min(len(repo.changelog), len(self._rbcrevs) // _rbcrecsize)
|
|
|
with repo.cachevfs.open(_rbcrevs, b'ab') as f:
|
|
|
if f.tell() != start:
|
|
|
repo.ui.debug(
|
|
|
b"truncating cache/%s to %d\n" % (_rbcrevs, start)
|
|
|
)
|
|
|
f.seek(start)
|
|
|
if f.tell() != start:
|
|
|
start = 0
|
|
|
f.seek(start)
|
|
|
f.truncate()
|
|
|
end = revs * _rbcrecsize
|
|
|
f.write(self._rbcrevs[start:end])
|
|
|
self._rbcrevslen = revs
|
|
|
|
