mercurial/branchmap.py
author Durham Goode <durham@fb.com>
Tue, 10 Feb 2015 19:53:48 -0800
changeset 24373 59cc09240afb
parent 24163 bb11081562d7
child 24374 77fd1fb538cd
permissions -rw-r--r--
revbranchcache: move out of branchmap onto localrepo Previously the revbranchcache was a field inside the branchmap. This is bad for a couple reasons: 1) There can be multiple branchmaps per repo (one for each filter level). There can only be one revbranchcache per repo. In fact, a revbranchcache could only exist on a branchmap that was for the unfiltered view, so you could have branchmaps exist for which you couldn't have a revbranchcache. It was funky. 2) The write lifecycle for the revbranchcache is going to be different from the branchmap (branchmap is greedily written early on, revbranchcache should be lazily computed and written). This patch moves the revbranchcache to live as a field on the localrepo (alongside self._branchmap). This will allow us to handle it's lifecycle differently, which will let us move it to be lazily computed in future patches.
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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 node import bin, hex, nullid, nullrev
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import encoding
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import util
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import time
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from array import array
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from struct import calcsize, pack, unpack
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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 = "cache/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 read(repo):
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    try:
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        f = repo.vfs(_filename(repo))
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        lines = f.read().split('\n')
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        f.close()
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    except (IOError, OSError):
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        return None
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    try:
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        cachekey = lines.pop(0).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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        if len(cachekey) > 2:
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            filteredhash = bin(cachekey[2])
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        partial = branchcache(tipnode=last, tiprev=lrev,
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                              filteredhash=filteredhash)
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        if not partial.validfor(repo):
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            # invalidate the cache
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            raise ValueError('tip differs')
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        for l in lines:
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            if not l:
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                continue
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            node, state, label = l.split(" ", 2)
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            if state not in 'oc':
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                raise ValueError('invalid branch state')
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            label = encoding.tolocal(label.strip())
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            if not node in repo:
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                raise ValueError('node %s does not exist' % node)
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            node = bin(node)
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            partial.setdefault(label, []).append(node)
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            if state == 'c':
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                partial._closednodes.add(node)
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    except KeyboardInterrupt:
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        raise
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    except Exception, inst:
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        if repo.ui.debugflag:
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            msg = 'invalid branchheads cache'
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            if repo.filtername is not None:
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                msg += ' (%s)' % repo.filtername
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            msg += ': %s\n'
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            repo.ui.debug(msg % inst)
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        partial = None
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    return partial
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### Nearest subset relation
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# Nearest subset of filter X is a filter Y so that:
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# * Y is included in X,
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# * X - Y is as small as possible.
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# This create and ordering used for branchmap purpose.
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# the ordering may be partial
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subsettable = {None: 'visible',
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               'visible': 'served',
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               'served': 'immutable',
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               'immutable': 'base'}
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def updatecache(repo):
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    cl = repo.changelog
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    filtername = repo.filtername
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    partial = repo._branchcaches.get(filtername)
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    revs = []
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    if partial is None or not partial.validfor(repo):
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        partial = read(repo)
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        if partial is None:
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            subsetname = subsettable.get(filtername)
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            if subsetname is None:
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                partial = branchcache()
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            else:
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                subset = repo.filtered(subsetname)
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                partial = subset.branchmap().copy()
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                extrarevs = subset.changelog.filteredrevs - cl.filteredrevs
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                revs.extend(r for  r in extrarevs if r <= partial.tiprev)
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    revs.extend(cl.revs(start=partial.tiprev + 1))
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    if revs:
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        partial.update(repo, revs)
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        partial.write(repo)
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    if repo._revbranchcache is not None:
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        repo._revbranchcache.write(repo)
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    assert partial.validfor(repo), filtername
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    repo._branchcaches[repo.filtername] = partial
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class branchcache(dict):
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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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   122
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   123
    The open/closed state is represented by a single letter 'o' or 'c'.
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   124
    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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   127
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    def __init__(self, entries=(), tipnode=nullid, tiprev=nullrev,
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                 filteredhash=None, closednodes=None):
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        super(branchcache, self).__init__(entries)
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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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   136
        # heads.
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   137
        if closednodes is None:
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   138
            self._closednodes = set()
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   139
        else:
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            self._closednodes = closednodes
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   141
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    def _hashfiltered(self, repo):
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        """build hash of revision filtered in the current cache
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   144
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   145
        Tracking tipnode and tiprev is not enough to ensure validity of the
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   146
        cache as they do not help to distinct cache that ignored various
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        revision bellow tiprev.
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   148
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        To detect such difference, we build a cache of all ignored revisions.
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   150
        """
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        cl = repo.changelog
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        if not cl.filteredrevs:
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            return None
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        key = None
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        revs = sorted(r for r in cl.filteredrevs if r <= self.tiprev)
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   156
        if revs:
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   157
            s = util.sha1()
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   158
            for rev in revs:
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   159
                s.update('%s;' % rev)
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   160
            key = s.digest()
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   161
        return key
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   162
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   163
    def validfor(self, repo):
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   164
        """Is the cache content valid regarding a repo
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diff changeset
   165
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   166
        - False when cached tipnode is unknown or if we detect a strip.
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   167
        - True when cache is up to date or a subset of current repo."""
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   168
        try:
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   169
            return ((self.tipnode == repo.changelog.node(self.tiprev))
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   170
                    and (self.filteredhash == self._hashfiltered(repo)))
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diff changeset
   171
        except IndexError:
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   172
            return False
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   173
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   174
    def _branchtip(self, heads):
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   175
        '''Return tuple with last open head in heads and false,
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   176
        otherwise return last closed head and true.'''
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   177
        tip = heads[-1]
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   178
        closed = True
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   179
        for h in reversed(heads):
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   180
            if h not in self._closednodes:
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   181
                tip = h
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   182
                closed = False
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   183
                break
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   184
        return tip, closed
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   185
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   186
    def branchtip(self, branch):
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   187
        '''Return the tipmost open head on branch head, otherwise return the
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   188
        tipmost closed head on branch.
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   189
        Raise KeyError for unknown branch.'''
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   190
        return self._branchtip(self[branch])[0]
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diff changeset
   191
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   192
    def branchheads(self, branch, closed=False):
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   193
        heads = self[branch]
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   194
        if not closed:
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   195
            heads = [h for h in heads if h not in self._closednodes]
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diff changeset
   196
        return heads
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diff changeset
   197
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   198
    def iterbranches(self):
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   199
        for bn, heads in self.iteritems():
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   200
            yield (bn, heads) + self._branchtip(heads)
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diff changeset
   201
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diff changeset
   202
    def copy(self):
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   203
        """return an deep copy of the branchcache object"""
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   204
        return branchcache(self, self.tipnode, self.tiprev, self.filteredhash,
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   205
                           self._closednodes)
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diff changeset
   206
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diff changeset
   207
    def write(self, repo):
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diff changeset
   208
        try:
23877
7cc77030c557 localrepo: remove all external users of localrepo.opener
Angel Ezquerra <angel.ezquerra@gmail.com>
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diff changeset
   209
            f = repo.vfs(_filename(repo), "w", atomictemp=True)
18184
8d48af68e2ae branchmap: read and write key part related to filtered revision
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diff changeset
   210
            cachekey = [hex(self.tipnode), str(self.tiprev)]
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diff changeset
   211
            if self.filteredhash is not None:
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diff changeset
   212
                cachekey.append(hex(self.filteredhash))
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diff changeset
   213
            f.write(" ".join(cachekey) + '\n')
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05cfcecb3aef branchmap: log events related to branch cache
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diff changeset
   214
            nodecount = 0
18357
a4ab37ca887b localrepo: store branchheads sorted
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diff changeset
   215
            for label, nodes in sorted(self.iteritems()):
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diff changeset
   216
                for node in nodes:
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diff changeset
   217
                    nodecount += 1
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diff changeset
   218
                    if node in self._closednodes:
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diff changeset
   219
                        state = 'c'
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diff changeset
   220
                    else:
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diff changeset
   221
                        state = 'o'
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diff changeset
   222
                    f.write("%s %s %s\n" % (hex(node), state,
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diff changeset
   223
                                            encoding.fromlocal(label)))
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diff changeset
   224
            f.close()
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05cfcecb3aef branchmap: log events related to branch cache
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parents: 20264
diff changeset
   225
            repo.ui.log('branchcache',
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diff changeset
   226
                        'wrote %s branch cache with %d labels and %d nodes\n',
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diff changeset
   227
                        repo.filtername, len(self), nodecount)
21788
c20843aee8a4 branch: add debug message for branch cache write failure
Matt Mackall <mpm@selenic.com>
parents: 21031
diff changeset
   228
        except (IOError, OSError, util.Abort), inst:
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diff changeset
   229
            repo.ui.debug("couldn't write branch cache: %s\n" % inst)
18214
cd4c75200206 branchmap: ignore Abort error while writing cache
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parents: 18212
diff changeset
   230
            # Abort may be raise by read only opener
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diff changeset
   231
            pass
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f0eeb9b3444a branchmap: make update a method
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents: 18130
diff changeset
   232
18305
2502a15e033d branchmap: pass revision insteads of changectx to the update function
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents: 18234
diff changeset
   233
    def update(self, repo, revgen):
18131
f0eeb9b3444a branchmap: make update a method
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parents: 18130
diff changeset
   234
        """Given a branchhead cache, self, that may have extra nodes or be
20263
ea4996754d91 branchmap: simplify update code
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents: 20262
diff changeset
   235
        missing heads, and a generator of nodes that are strictly a superset of
18131
f0eeb9b3444a branchmap: make update a method
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parents: 18130
diff changeset
   236
        heads missing, this function updates self to be correct.
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        """
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        starttime = time.time()
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        cl = repo.changelog
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        # collect new branch entries
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        newbranches = {}
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        urepo = repo.unfiltered()
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        ucl = urepo.changelog
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        getbranchinfo = repo.revbranchcache().branchinfo
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        for r in revgen:
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   246
            branch, closesbranch = getbranchinfo(ucl, 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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   253
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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.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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   263
            # assert not (set(bheadrevs) & set(newheadrevs))
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   264
            newheadrevs.sort()
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   265
            bheadset.update(newheadrevs)
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   266
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   267
            # This prunes out two kinds of heads - heads that are superseded by
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   268
            # a head in newheadrevs, and newheadrevs that are not heads because
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   269
            # an existing head is their descendant.
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   270
            uncertain = bheadset - topoheads
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   271
            if uncertain:
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   272
                floorrev = min(uncertain)
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                ancestors = set(cl.ancestors(newheadrevs, floorrev))
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   274
                bheadset -= ancestors
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   275
            bheadrevs = sorted(bheadset)
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            self[branch] = [cl.node(rev) for rev in bheadrevs]
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   277
            tiprev = bheadrevs[-1]
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   278
            if tiprev > self.tiprev:
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   279
                self.tipnode = cl.node(tiprev)
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   280
                self.tiprev = tiprev
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   281
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   282
        if not self.validfor(repo):
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   283
            # cache key are not valid anymore
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   284
            self.tipnode = nullid
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   285
            self.tiprev = nullrev
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   286
            for heads in self.values():
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   287
                tiprev = max(cl.rev(node) for node in heads)
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   288
                if tiprev > self.tiprev:
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   289
                    self.tipnode = cl.node(tiprev)
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   290
                    self.tiprev = tiprev
18168
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diff changeset
   291
        self.filteredhash = self._hashfiltered(repo)
21031
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diff changeset
   292
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diff changeset
   293
        duration = time.time() - starttime
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   294
        repo.ui.log('branchcache', 'updated %s branch cache in %.4f seconds\n',
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diff changeset
   295
                    repo.filtername, duration)
23785
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diff changeset
   296
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   297
# Revision branch info cache
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   298
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   299
_rbcversion = '-v1'
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   300
_rbcnames = 'cache/rbc-names' + _rbcversion
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diff changeset
   301
_rbcrevs = 'cache/rbc-revs' + _rbcversion
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diff changeset
   302
# [4 byte hash prefix][4 byte branch name number with sign bit indicating open]
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diff changeset
   303
_rbcrecfmt = '>4sI'
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diff changeset
   304
_rbcrecsize = calcsize(_rbcrecfmt)
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diff changeset
   305
_rbcnodelen = 4
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diff changeset
   306
_rbcbranchidxmask = 0x7fffffff
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diff changeset
   307
_rbccloseflag = 0x80000000
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diff changeset
   308
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   309
class revbranchcache(object):
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   310
    """Persistent cache, mapping from revision number to branch name and close.
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   311
    This is a low level cache, independent of filtering.
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diff changeset
   312
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   313
    Branch names are stored in rbc-names in internal encoding separated by 0.
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diff changeset
   314
    rbc-names is append-only, and each branch name is only stored once and will
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diff changeset
   315
    thus have a unique index.
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parents: 22357
diff changeset
   316
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diff changeset
   317
    The branch info for each revision is stored in rbc-revs as constant size
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diff changeset
   318
    records. The whole file is read into memory, but it is only 'parsed' on
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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parents: 22357
diff changeset
   319
    demand. The file is usually append-only but will be truncated if repo
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diff changeset
   320
    modification is detected.
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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parents: 22357
diff changeset
   321
    The record for each revision contains the first 4 bytes of the
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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diff changeset
   322
    corresponding node hash, and the record is only used if it still matches.
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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parents: 22357
diff changeset
   323
    Even a completely trashed rbc-revs fill thus still give the right result
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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parents: 22357
diff changeset
   324
    while converging towards full recovery ... assuming no incorrectly matching
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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diff changeset
   325
    node hashes.
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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parents: 22357
diff changeset
   326
    The record also contains 4 bytes where 31 bits contains the index of the
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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diff changeset
   327
    branch and the last bit indicate that it is a branch close commit.
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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diff changeset
   328
    The usage pattern for rbc-revs is thus somewhat similar to 00changelog.i
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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parents: 22357
diff changeset
   329
    and will grow with it but be 1/8th of its size.
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diff changeset
   330
    """
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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diff changeset
   331
24159
5b4ed033390b revisionbranchcache: fall back to slow path if starting readonly (issue4531)
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diff changeset
   332
    def __init__(self, repo, readonly=True):
23785
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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diff changeset
   333
        assert repo.filtername is None
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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parents: 22357
diff changeset
   334
        self._names = [] # branch names in local encoding with static index
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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parents: 22357
diff changeset
   335
        self._rbcrevs = array('c') # structs of type _rbcrecfmt
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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diff changeset
   336
        self._rbcsnameslen = 0
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diff changeset
   337
        try:
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diff changeset
   338
            bndata = repo.vfs.read(_rbcnames)
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diff changeset
   339
            self._rbcsnameslen = len(bndata) # for verification before writing
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diff changeset
   340
            self._names = [encoding.tolocal(bn) for bn in bndata.split('\0')]
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diff changeset
   341
        except (IOError, OSError), inst:
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diff changeset
   342
            repo.ui.debug("couldn't read revision branch cache names: %s\n" %
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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diff changeset
   343
                          inst)
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diff changeset
   344
            if readonly:
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diff changeset
   345
                # don't try to use cache - fall back to the slow path
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parents: 23877
diff changeset
   346
                self.branchinfo = self._branchinfo
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diff changeset
   347
23785
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diff changeset
   348
        if self._names:
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diff changeset
   349
            try:
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diff changeset
   350
                data = repo.vfs.read(_rbcrevs)
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diff changeset
   351
                self._rbcrevs.fromstring(data)
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diff changeset
   352
            except (IOError, OSError), inst:
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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parents: 22357
diff changeset
   353
                repo.ui.debug("couldn't read revision branch cache: %s\n" %
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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parents: 22357
diff changeset
   354
                              inst)
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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parents: 22357
diff changeset
   355
        # remember number of good records on disk
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   356
        self._rbcrevslen = min(len(self._rbcrevs) // _rbcrecsize,
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   357
                               len(repo.changelog))
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parents: 22357
diff changeset
   358
        if self._rbcrevslen == 0:
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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parents: 22357
diff changeset
   359
            self._names = []
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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diff changeset
   360
        self._rbcnamescount = len(self._names) # number of good names on disk
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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parents: 22357
diff changeset
   361
        self._namesreverse = dict((b, r) for r, b in enumerate(self._names))
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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parents: 22357
diff changeset
   362
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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parents: 22357
diff changeset
   363
    def branchinfo(self, changelog, rev):
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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parents: 22357
diff changeset
   364
        """Return branch name and close flag for rev, using and updating
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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parents: 22357
diff changeset
   365
        persistent cache."""
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
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parents: 22357
diff changeset
   366
        rbcrevidx = rev * _rbcrecsize
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   367
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   368
        # if requested rev is missing, add and populate all missing revs
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   369
        if len(self._rbcrevs) < rbcrevidx + _rbcrecsize:
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   370
            first = len(self._rbcrevs) // _rbcrecsize
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   371
            self._rbcrevs.extend('\0' * (len(changelog) * _rbcrecsize -
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   372
                                         len(self._rbcrevs)))
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   373
            for r in xrange(first, len(changelog)):
23786
7d63398fbfd1 branchmap: use revbranchcache when updating branch map
Mads Kiilerich <madski@unity3d.com>
parents: 23785
diff changeset
   374
                self._branchinfo(changelog, r)
23785
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   375
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   376
        # fast path: extract data from cache, use it if node is matching
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   377
        reponode = changelog.node(rev)[:_rbcnodelen]
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   378
        cachenode, branchidx = unpack(
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   379
            _rbcrecfmt, buffer(self._rbcrevs, rbcrevidx, _rbcrecsize))
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   380
        close = bool(branchidx & _rbccloseflag)
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   381
        if close:
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   382
            branchidx &= _rbcbranchidxmask
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   383
        if cachenode == reponode:
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   384
            return self._names[branchidx], close
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   385
        # fall back to slow path and make sure it will be written to disk
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   386
        self._rbcrevslen = min(self._rbcrevslen, rev)
23786
7d63398fbfd1 branchmap: use revbranchcache when updating branch map
Mads Kiilerich <madski@unity3d.com>
parents: 23785
diff changeset
   387
        return self._branchinfo(changelog, rev)
23785
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   388
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   389
    def _branchinfo(self, changelog, rev):
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   390
        """Retrieve branch info from changelog and update _rbcrevs"""
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   391
        b, close = changelog.branchinfo(rev)
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   392
        if b in self._namesreverse:
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   393
            branchidx = self._namesreverse[b]
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   394
        else:
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   395
            branchidx = len(self._names)
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   396
            self._names.append(b)
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   397
            self._namesreverse[b] = branchidx
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   398
        reponode = changelog.node(rev)
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   399
        if close:
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   400
            branchidx |= _rbccloseflag
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   401
        rbcrevidx = rev * _rbcrecsize
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   402
        rec = array('c')
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   403
        rec.fromstring(pack(_rbcrecfmt, reponode, branchidx))
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   404
        self._rbcrevs[rbcrevidx:rbcrevidx + _rbcrecsize] = rec
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   405
        return b, close
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   406
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   407
    def write(self, repo):
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   408
        """Save branch cache if it is dirty."""
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   409
        if self._rbcnamescount < len(self._names):
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   410
            try:
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   411
                if self._rbcnamescount != 0:
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   412
                    f = repo.vfs.open(_rbcnames, 'ab')
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   413
                    if f.tell() == self._rbcsnameslen:
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   414
                        f.write('\0')
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   415
                    else:
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   416
                        f.close()
23862
7aa1405528a3 branchcache: add debug output whenever cache files use truncate
Mads Kiilerich <madski@unity3d.com>
parents: 23819
diff changeset
   417
                        repo.ui.debug("%s changed - rewriting it\n" % _rbcnames)
23785
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   418
                        self._rbcnamescount = 0
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   419
                        self._rbcrevslen = 0
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   420
                if self._rbcnamescount == 0:
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   421
                    f = repo.vfs.open(_rbcnames, 'wb')
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   422
                f.write('\0'.join(encoding.fromlocal(b)
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   423
                                  for b in self._names[self._rbcnamescount:]))
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   424
                self._rbcsnameslen = f.tell()
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   425
                f.close()
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   426
            except (IOError, OSError, util.Abort), inst:
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   427
                repo.ui.debug("couldn't write revision branch cache names: "
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   428
                              "%s\n" % inst)
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   429
                return
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   430
            self._rbcnamescount = len(self._names)
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   431
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   432
        start = self._rbcrevslen * _rbcrecsize
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   433
        if start != len(self._rbcrevs):
23863
669106fc5bb1 branchcache: make _rbcrevslen handling more safe
Mads Kiilerich <madski@unity3d.com>
parents: 23862
diff changeset
   434
            revs = min(len(repo.changelog), len(self._rbcrevs) // _rbcrecsize)
23785
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   435
            try:
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   436
                f = repo.vfs.open(_rbcrevs, 'ab')
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   437
                if f.tell() != start:
23862
7aa1405528a3 branchcache: add debug output whenever cache files use truncate
Mads Kiilerich <madski@unity3d.com>
parents: 23819
diff changeset
   438
                    repo.ui.debug("truncating %s to %s\n" % (_rbcrevs, start))
23785
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   439
                    f.seek(start)
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   440
                    f.truncate()
23863
669106fc5bb1 branchcache: make _rbcrevslen handling more safe
Mads Kiilerich <madski@unity3d.com>
parents: 23862
diff changeset
   441
                end = revs * _rbcrecsize
23785
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   442
                f.write(self._rbcrevs[start:end])
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   443
                f.close()
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   444
            except (IOError, OSError, util.Abort), inst:
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   445
                repo.ui.debug("couldn't write revision branch cache: %s\n" %
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   446
                              inst)
cb99bacb9b4e branchcache: introduce revbranchcache for caching of revision branch names
Mads Kiilerich <madski@unity3d.com>
parents: 22357
diff changeset
   447
                return
23863
669106fc5bb1 branchcache: make _rbcrevslen handling more safe
Mads Kiilerich <madski@unity3d.com>
parents: 23862
diff changeset
   448
            self._rbcrevslen = revs