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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 Matt Mackall <mpm@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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nullid,
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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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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()
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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 = []
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for bheads in remotebranchmap.itervalues():
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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.append(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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remotebranchmap, repo[rtiprev].node(), rtiprev,
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closednodes=closed)
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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 ('base', 'immutable', '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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"""
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raise ValueError(r'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 'branch cache (%s)' % repo.filtername
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else:
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return '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__(self, entries=(), tipnode=nullid, tiprev=nullrev,
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filteredhash=None, closednodes=None, hasnode=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.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 self._entries.iteritems():
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self._verifybranch(k)
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yield k, v
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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('\n').split(" ", 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(tipnode=last, tiprev=lrev, filteredhash=filteredhash,
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hasnode=hasnode)
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if not bcache.validfor(repo):
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# invalidate the cache
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raise ValueError(r'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 = 'invalid %s: %s\n'
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repo.ui.debug(msg % (_branchcachedesc(repo),
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pycompat.bytestr(inst)))
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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('\n')
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if not line:
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continue
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node, state, label = line.split(" ", 2)
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if state not in 'oc':
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raise ValueError(r'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 == '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 = "branch2"
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if repo.filtername:
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filename = '%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))
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and (self.filteredhash ==
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scmutil.filteredhash(repo, self.tiprev)))
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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 self.iteritems():
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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 self._entries.itervalues()
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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._entries, self.tipnode, self.tiprev, self.filteredhash,
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self._closednodes)
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def write(self, repo):
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try:
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f = repo.cachevfs(self._filename(repo), "w", atomictemp=True)
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cachekey = [hex(self.tipnode), '%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(" ".join(cachekey) + '\n')
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nodecount = 0
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for label, nodes in sorted(self._entries.iteritems()):
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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 = 'c'
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else:
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state = 'o'
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f.write("%s %s %s\n" % (hex(node), state, label))
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f.close()
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repo.ui.log('branchcache', 'wrote %s with %d labels and %d nodes\n',
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_branchcachedesc(repo), len(self._entries), nodecount)
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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("couldn't write branch cache: %s\n" %
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stringutil.forcebytestr(inst))
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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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# fetch current topological heads to speed up filtering
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topoheads = set(cl.headrevs())
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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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# if older branchheads are reachable from new ones, they aren't
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# really branchheads. Note checking parents is insufficient:
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# 1 (branch a) -> 2 (branch b) -> 3 (branch a)
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for branch, newheadrevs in newbranches.iteritems():
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bheads = self._entries.setdefault(branch, [])
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bheadset = set(cl.rev(node) for node in bheads)
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# This have been tested True on all internal usage of this function.
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# run it again in case of doubt
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# assert not (set(bheadrevs) & set(newheadrevs))
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bheadset.update(newheadrevs)
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# This prunes out two kinds of heads - heads that are superseded by
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# a head in newheadrevs, and newheadrevs that are not heads because
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# an existing head is their descendant.
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uncertain = bheadset - topoheads
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if uncertain:
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floorrev = min(uncertain)
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ancestors = set(cl.ancestors(newheadrevs, floorrev))
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bheadset -= ancestors
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bheadrevs = sorted(bheadset)
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self[branch] = [cl.node(rev) for rev in bheadrevs]
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tiprev = bheadrevs[-1]
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if tiprev > ntiprev:
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ntiprev = tiprev
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if ntiprev > self.tiprev:
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self.tiprev = ntiprev
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self.tipnode = cl.node(ntiprev)
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if not self.validfor(repo):
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# cache key are not valid anymore
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self.tipnode = nullid
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self.tiprev = nullrev
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for heads in self.iterheads():
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tiprev = max(cl.rev(node) for node in heads)
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if tiprev > self.tiprev:
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self.tipnode = cl.node(tiprev)
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self.tiprev = tiprev
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self.filteredhash = scmutil.filteredhash(repo, self.tiprev)
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duration = util.timer() - starttime
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repo.ui.log('branchcache', 'updated %s in %.4f seconds\n',
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_branchcachedesc(repo), duration)
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self.write(repo)
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class remotebranchcache(branchcache):
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"""Branchmap info for a remote connection, should not write locally"""
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def write(self, repo):
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pass
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# Revision branch info cache
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_rbcversion = '-v1'
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_rbcnames = 'rbc-names' + _rbcversion
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_rbcrevs = 'rbc-revs' + _rbcversion
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# [4 byte hash prefix][4 byte branch name number with sign bit indicating open]
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_rbcrecfmt = '>4sI'
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_rbcrecsize = calcsize(_rbcrecfmt)
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_rbcnodelen = 4
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_rbcbranchidxmask = 0x7fffffff
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_rbccloseflag = 0x80000000
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class revbranchcache(object):
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"""Persistent cache, mapping from revision number to branch name and close.
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This is a low level cache, independent of filtering.
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Branch names are stored in rbc-names in internal encoding separated by 0.
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rbc-names is append-only, and each branch name is only stored once and will
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thus have a unique index.
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The branch info for each revision is stored in rbc-revs as constant size
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records. The whole file is read into memory, but it is only 'parsed' on
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demand. The file is usually append-only but will be truncated if repo
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modification is detected.
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The record for each revision contains the first 4 bytes of the
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corresponding node hash, and the record is only used if it still matches.
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Even a completely trashed rbc-revs fill thus still give the right result
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while converging towards full recovery ... assuming no incorrectly matching
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node hashes.
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The record also contains 4 bytes where 31 bits contains the index of the
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branch and the last bit indicate that it is a branch close commit.
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The usage pattern for rbc-revs is thus somewhat similar to 00changelog.i
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and will grow with it but be 1/8th of its size.
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"""
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def __init__(self, repo, readonly=True):
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assert repo.filtername is None
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self._repo = repo
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self._names = [] # branch names in local encoding with static index
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self._rbcrevs = bytearray()
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self._rbcsnameslen = 0 # length of names read at _rbcsnameslen
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try:
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bndata = repo.cachevfs.read(_rbcnames)
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self._rbcsnameslen = len(bndata) # for verification before writing
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if bndata:
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self._names = [encoding.tolocal(bn)
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for bn in bndata.split('\0')]
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except (IOError, OSError):
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if readonly:
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# don't try to use cache - fall back to the slow path
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self.branchinfo = self._branchinfo
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if self._names:
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try:
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data = repo.cachevfs.read(_rbcrevs)
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self._rbcrevs[:] = data
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except (IOError, OSError) as inst:
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repo.ui.debug("couldn't read revision branch cache: %s\n" %
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stringutil.forcebytestr(inst))
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# remember number of good records on disk
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self._rbcrevslen = min(len(self._rbcrevs) // _rbcrecsize,
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len(repo.changelog))
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if self._rbcrevslen == 0:
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self._names = []
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self._rbcnamescount = len(self._names) # number of names read at
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# _rbcsnameslen
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def _clear(self):
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self._rbcsnameslen = 0
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del self._names[:]
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self._rbcnamescount = 0
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self._rbcrevslen = len(self._repo.changelog)
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self._rbcrevs = bytearray(self._rbcrevslen * _rbcrecsize)
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util.clearcachedproperty(self, '_namesreverse')
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@util.propertycache
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def _namesreverse(self):
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return dict((b, r) for r, b in enumerate(self._names))
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def branchinfo(self, rev):
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"""Return branch name and close flag for rev, using and updating
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persistent cache."""
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changelog = self._repo.changelog
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rbcrevidx = rev * _rbcrecsize
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# avoid negative index, changelog.read(nullrev) is fast without cache
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if rev == nullrev:
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return changelog.branchinfo(rev)
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# if requested rev isn't allocated, grow and cache the rev info
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if len(self._rbcrevs) < rbcrevidx + _rbcrecsize:
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return self._branchinfo(rev)
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# fast path: extract data from cache, use it if node is matching
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reponode = changelog.node(rev)[:_rbcnodelen]
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cachenode, branchidx = unpack_from(
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_rbcrecfmt, util.buffer(self._rbcrevs), rbcrevidx)
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close = bool(branchidx & _rbccloseflag)
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if close:
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branchidx &= _rbcbranchidxmask
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if cachenode == '\0\0\0\0':
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pass
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elif cachenode == reponode:
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try:
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return self._names[branchidx], close
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except IndexError:
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# recover from invalid reference to unknown branch
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self._repo.ui.debug("referenced branch names not found"
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" - rebuilding revision branch cache from scratch\n")
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self._clear()
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else:
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# rev/node map has changed, invalidate the cache from here up
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self._repo.ui.debug("history modification detected - truncating "
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"revision branch cache to revision %d\n" % rev)
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truncate = rbcrevidx + _rbcrecsize
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del self._rbcrevs[truncate:]
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self._rbcrevslen = min(self._rbcrevslen, truncate)
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# fall back to slow path and make sure it will be written to disk
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return self._branchinfo(rev)
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def _branchinfo(self, rev):
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"""Retrieve branch info from changelog and update _rbcrevs"""
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changelog = self._repo.changelog
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b, close = changelog.branchinfo(rev)
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if b in self._namesreverse:
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branchidx = self._namesreverse[b]
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else:
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branchidx = len(self._names)
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self._names.append(b)
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self._namesreverse[b] = branchidx
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reponode = changelog.node(rev)
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if close:
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branchidx |= _rbccloseflag
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self._setcachedata(rev, reponode, branchidx)
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return b, close
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def setdata(self, branch, rev, node, close):
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"""add new data information to the cache"""
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if branch in self._namesreverse:
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branchidx = self._namesreverse[branch]
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else:
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branchidx = len(self._names)
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self._names.append(branch)
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self._namesreverse[branch] = branchidx
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if close:
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branchidx |= _rbccloseflag
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self._setcachedata(rev, node, branchidx)
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# If no cache data were readable (non exists, bad permission, etc)
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# the cache was bypassing itself by setting:
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#
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# self.branchinfo = self._branchinfo
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#
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# Since we now have data in the cache, we need to drop this bypassing.
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if r'branchinfo' in vars(self):
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del self.branchinfo
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def _setcachedata(self, rev, node, branchidx):
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"""Writes the node's branch data to the in-memory cache data."""
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if rev == nullrev:
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return
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rbcrevidx = rev * _rbcrecsize
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if len(self._rbcrevs) < rbcrevidx + _rbcrecsize:
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self._rbcrevs.extend('\0' *
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(len(self._repo.changelog) * _rbcrecsize -
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len(self._rbcrevs)))
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pack_into(_rbcrecfmt, self._rbcrevs, rbcrevidx, node, branchidx)
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self._rbcrevslen = min(self._rbcrevslen, rev)
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tr = self._repo.currenttransaction()
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if tr:
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tr.addfinalize('write-revbranchcache', self.write)
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def write(self, tr=None):
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"""Save branch cache if it is dirty."""
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repo = self._repo
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wlock = None
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step = ''
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try:
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# write the new names
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if self._rbcnamescount < len(self._names):
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wlock = repo.wlock(wait=False)
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step = ' names'
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self._writenames(repo)
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# write the new revs
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start = self._rbcrevslen * _rbcrecsize
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if start != len(self._rbcrevs):
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step = ''
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if wlock is None:
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wlock = repo.wlock(wait=False)
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self._writerevs(repo, start)
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except (IOError, OSError, error.Abort, error.LockError) as inst:
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repo.ui.debug("couldn't write revision branch cache%s: %s\n"
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% (step, stringutil.forcebytestr(inst)))
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finally:
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if wlock is not None:
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wlock.release()
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def _writenames(self, repo):
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""" write the new branch names to revbranchcache """
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if self._rbcnamescount != 0:
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f = repo.cachevfs.open(_rbcnames, 'ab')
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if f.tell() == self._rbcsnameslen:
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f.write('\0')
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else:
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f.close()
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repo.ui.debug("%s changed - rewriting it\n" % _rbcnames)
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self._rbcnamescount = 0
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self._rbcrevslen = 0
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if self._rbcnamescount == 0:
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# before rewriting names, make sure references are removed
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repo.cachevfs.unlinkpath(_rbcrevs, ignoremissing=True)
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f = repo.cachevfs.open(_rbcnames, 'wb')
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f.write('\0'.join(encoding.fromlocal(b)
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for b in self._names[self._rbcnamescount:]))
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self._rbcsnameslen = f.tell()
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f.close()
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self._rbcnamescount = len(self._names)
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def _writerevs(self, repo, start):
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""" write the new revs to revbranchcache """
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revs = min(len(repo.changelog), len(self._rbcrevs) // _rbcrecsize)
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with repo.cachevfs.open(_rbcrevs, 'ab') as f:
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if f.tell() != start:
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repo.ui.debug("truncating cache/%s to %d\n" % (_rbcrevs, start))
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f.seek(start)
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if f.tell() != start:
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start = 0
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f.seek(start)
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f.truncate()
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end = revs * _rbcrecsize
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f.write(self._rbcrevs[start:end])
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self._rbcrevslen = revs
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