mercurial/branchmap.py
author Brodie Rao <brodie@sf.io>
Mon, 16 Sep 2013 01:08:29 -0700
changeset 20190 d5d25e541637
parent 20188 3a3727829607
child 20245 4edd179fefb8
permissions -rw-r--r--
branchmap: introduce iterbranches() method
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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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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.opener(_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.warn(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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    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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   117
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    The open/closed state is represented by a single letter 'o' or 'c'.
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   119
    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):
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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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   131
        # heads.
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        if closednodes is None:
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   133
            self._closednodes = set()
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   134
        else:
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            self._closednodes = closednodes
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   136
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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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   139
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   140
        Tracking tipnode and tiprev is not enough to ensure validity of the
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   141
        cache as they do not help to distinct cache that ignored various
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        revision bellow tiprev.
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   143
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        To detect such difference, we build a cache of all ignored revisions.
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   145
        """
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        cl = repo.changelog
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   147
        if not cl.filteredrevs:
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   148
            return None
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   149
        key = None
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        revs = sorted(r for r in cl.filteredrevs if r <= self.tiprev)
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   151
        if revs:
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   152
            s = util.sha1()
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   153
            for rev in revs:
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   154
                s.update('%s;' % rev)
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   155
            key = s.digest()
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   156
        return key
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   157
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   158
    def validfor(self, repo):
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   159
        """Is the cache content valid regarding a repo
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   160
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   161
        - False when cached tipnode is unknown or if we detect a strip.
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   162
        - True when cache is up to date or a subset of current repo."""
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   163
        try:
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   164
            return ((self.tipnode == repo.changelog.node(self.tiprev))
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   165
                    and (self.filteredhash == self._hashfiltered(repo)))
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diff changeset
   166
        except IndexError:
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diff changeset
   167
            return False
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diff changeset
   168
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   169
    def _branchtip(self, heads):
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   170
        tip = heads[-1]
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   171
        closed = True
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   172
        for h in reversed(heads):
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   173
            if h not in self._closednodes:
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   174
                tip = h
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   175
                closed = False
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   176
                break
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   177
        return tip, closed
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   178
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   179
    def branchtip(self, branch):
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   180
        return self._branchtip(self[branch])[0]
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   181
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   182
    def branchheads(self, branch, closed=False):
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   183
        heads = self[branch]
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   184
        if not closed:
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   185
            heads = [h for h in heads if h not in self._closednodes]
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   186
        return heads
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   187
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   188
    def iterbranches(self):
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   189
        for bn, heads in self.iteritems():
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   190
            yield (bn, heads) + self._branchtip(heads)
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diff changeset
   191
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diff changeset
   192
    def copy(self):
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diff changeset
   193
        """return an deep copy of the branchcache object"""
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diff changeset
   194
        return branchcache(self, self.tipnode, self.tiprev, self.filteredhash,
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   195
                           self._closednodes)
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   196
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diff changeset
   197
    def write(self, repo):
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diff changeset
   198
        try:
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diff changeset
   199
            f = repo.opener(_filename(repo), "w", atomictemp=True)
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diff changeset
   200
            cachekey = [hex(self.tipnode), str(self.tiprev)]
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diff changeset
   201
            if self.filteredhash is not None:
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diff changeset
   202
                cachekey.append(hex(self.filteredhash))
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diff changeset
   203
            f.write(" ".join(cachekey) + '\n')
18357
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diff changeset
   204
            for label, nodes in sorted(self.iteritems()):
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diff changeset
   205
                for node in nodes:
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   206
                    if node in self._closednodes:
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   207
                        state = 'c'
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diff changeset
   208
                    else:
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diff changeset
   209
                        state = 'o'
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   210
                    f.write("%s %s %s\n" % (hex(node), state,
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diff changeset
   211
                                            encoding.fromlocal(label)))
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diff changeset
   212
            f.close()
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cd4c75200206 branchmap: ignore Abort error while writing cache
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parents: 18212
diff changeset
   213
        except (IOError, OSError, util.Abort):
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parents: 18212
diff changeset
   214
            # Abort may be raise by read only opener
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diff changeset
   215
            pass
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diff changeset
   216
18305
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diff changeset
   217
    def update(self, repo, revgen):
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f0eeb9b3444a branchmap: make update a method
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diff changeset
   218
        """Given a branchhead cache, self, that may have extra nodes or be
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diff changeset
   219
        missing heads, and a generator of nodes that are at least a superset of
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diff changeset
   220
        heads missing, this function updates self to be correct.
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diff changeset
   221
        """
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diff changeset
   222
        cl = repo.changelog
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diff changeset
   223
        # collect new branch entries
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diff changeset
   224
        newbranches = {}
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diff changeset
   225
        getbranchinfo = cl.branchinfo
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0eed2546118a branchmap: Save changectx creation during update
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diff changeset
   226
        for r in revgen:
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diff changeset
   227
            branch, closesbranch = getbranchinfo(r)
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diff changeset
   228
            node = cl.node(r)
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diff changeset
   229
            newbranches.setdefault(branch, []).append(node)
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diff changeset
   230
            if closesbranch:
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diff changeset
   231
                self._closednodes.add(node)
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diff changeset
   232
        # if older branchheads are reachable from new ones, they aren't
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diff changeset
   233
        # really branchheads. Note checking parents is insufficient:
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diff changeset
   234
        # 1 (branch a) -> 2 (branch b) -> 3 (branch a)
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diff changeset
   235
        for branch, newnodes in newbranches.iteritems():
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diff changeset
   236
            bheads = self.setdefault(branch, [])
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diff changeset
   237
            # Remove candidate heads that no longer are in the repo (e.g., as
f0eeb9b3444a branchmap: make update a method
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diff changeset
   238
            # the result of a strip that just happened).  Avoid using 'node in
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            # self' here because that dives down into branchcache code somewhat
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            # recursively.
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            bheadrevs = [cl.rev(node) for node in bheads
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                         if cl.hasnode(node)]
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            newheadrevs = [cl.rev(node) for node in newnodes
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                           if cl.hasnode(node)]
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            ctxisnew = bheadrevs and min(newheadrevs) > max(bheadrevs)
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            # Remove duplicates - nodes that are in newheadrevs and are already
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            # in bheadrevs.  This can happen if you strip a node whose parent
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            # was already a head (because they're on different branches).
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            bheadrevs = sorted(set(bheadrevs).union(newheadrevs))
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            # Starting from tip means fewer passes over reachable.  If we know
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            # the new candidates are not ancestors of existing heads, we don't
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            # have to examine ancestors of existing heads
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            if ctxisnew:
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                iterrevs = sorted(newheadrevs)
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            else:
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                iterrevs = list(bheadrevs)
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            # This loop prunes out two kinds of heads - heads that are
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            # superseded by a head in newheadrevs, and newheadrevs that are not
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            # heads because an existing head is their descendant.
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            while iterrevs:
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                latest = iterrevs.pop()
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                if latest not in bheadrevs:
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                    continue
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                ancestors = set(cl.ancestors([latest],
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                                                         bheadrevs[0]))
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                if ancestors:
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                    bheadrevs = [b for b in bheadrevs if b not in ancestors]
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            self[branch] = [cl.node(rev) for rev in bheadrevs]
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            tiprev = max(bheadrevs)
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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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        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.values():
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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 = self._hashfiltered(repo)