hgext3rd/topic/topicmap.py
author Sean Farley <sean@farley.io>
Sat, 19 Mar 2016 14:15:45 -0700
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child 1927 cf33ba7fbf4b
permissions -rw-r--r--
init: whitespace fixups
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from mercurial import branchmap
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from mercurial import encoding
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from mercurial import error
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from mercurial import scmutil
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from mercurial import util
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from mercurial.node import hex, bin, nullid
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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/topicmap"
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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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oldbranchcache = branchmap.branchcache
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def _phaseshash(repo, maxrev):
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    revs = set()
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    cl = repo.changelog
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    fr = cl.filteredrevs
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    nm = cl.nodemap
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    for roots in repo._phasecache.phaseroots[1:]:
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        for n in roots:
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            r = nm.get(n)
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            if r not in fr and r < maxrev:
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                revs.add(r)
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    key = nullid
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    revs = sorted(revs)
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    if revs:
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        s = util.sha1()
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        for rev in revs:
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            s.update('%s;' % rev)
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        key = s.digest()
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    return key
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class topiccache(oldbranchcache):
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    def __init__(self, *args, **kwargs):
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        otherbranchcache = branchmap.branchcache
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        try:
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            # super() call may fail otherwise
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            branchmap.branchcache = oldbranchcache
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            super(topiccache, self).__init__(*args, **kwargs)
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            if self.filteredhash is None:
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                self.filteredhash = nullid
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            self.phaseshash = nullid
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        finally:
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            branchmap.branchcache = otherbranchcache
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    def copy(self):
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        """return an deep copy of the branchcache object"""
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        new =  topiccache(self, self.tipnode, self.tiprev, self.filteredhash,
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                          self._closednodes)
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        if self.filteredhash is None:
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            self.filteredhash = nullid
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        new.phaseshash = self.phaseshash
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        return new
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    def branchtip(self, branch, topic=''):
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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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        if topic:
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            branch = '%s:%s' % (branch, topic)
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        return super(topiccache, self).branchtip(branch)
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    def branchheads(self, branch, closed=False, topic=''):
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        if topic:
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            branch = '%s:%s' % (branch, topic)
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        return super(topiccache, self).branchheads(branch, closed=closed)
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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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        # This is copy paste of mercurial.branchmap.branchcache.validfor in
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        # 69077c65919d With a small changes to the cache key handling to
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        # include phase information that impact the topic cache.
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        #
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        # All code changes should be flagged on site.
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        try:
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            if (self.tipnode == repo.changelog.node(self.tiprev)):
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                fh = scmutil.filteredhash(repo, self.tiprev)
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                if fh is None:
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                    fh = nullid
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                if ((self.filteredhash == fh)
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                     and (self.phaseshash == _phaseshash(repo, self.tiprev))):
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                    return True
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            return False
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        except IndexError:
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            return False
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    def write(self, repo):
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        # This is copy paste of mercurial.branchmap.branchcache.write in
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        # 69077c65919d With a small changes to the cache key handling to
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        # include phase information that impact the topic cache.
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        #
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        # All code changes should be flagged on site.
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        try:
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            f = repo.vfs(_filename(repo), "w", atomictemp=True)
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            cachekey = [hex(self.tipnode), str(self.tiprev)]
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            # [CHANGE] we need a hash in all cases
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            assert self.filteredhash is not None
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            cachekey.append(hex(self.filteredhash))
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            cachekey.append(hex(self.phaseshash))
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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.iteritems()):
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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,
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                                            encoding.fromlocal(label)))
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            f.close()
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            repo.ui.log('branchcache',
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                        'wrote %s branch cache with %d labels and %d nodes\n',
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                        repo.filtername, len(self), nodecount)
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        except (IOError, OSError, error.Abort) as inst:
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            repo.ui.debug("couldn't write branch cache: %s\n" % inst)
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            # Abort may be raise by read only opener
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            pass
1885
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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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        oldgetbranchinfo = repo.revbranchcache().branchinfo
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        try:
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            def branchinfo(r):
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                info = oldgetbranchinfo(r)
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                topic = ''
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                ctx = repo[r]
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                if ctx.mutable():
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                    topic = ctx.topic()
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                branch = info[0]
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                if topic:
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                    branch = '%s:%s' % (branch, topic)
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                return (branch, info[1])
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            repo.revbranchcache().branchinfo = branchinfo
1890
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            super(topiccache, self).update(repo, revgen)
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            if self.filteredhash is None:
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                self.filteredhash = nullid
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            self.phaseshash = _phaseshash(repo, self.tiprev)
1885
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        finally:
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            repo.revbranchcache().branchinfo = oldgetbranchinfo
1890
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def readtopicmap(repo):
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    # This is copy paste of mercurial.branchmap.read in 69077c65919d
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    # With a small changes to the cache key handling to include phase
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    # information that impact the topic cache.
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    #
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    # All code changes should be flagged on site.
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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 = bin(cachekey[2]) # [CHANGE] unconditional filteredhash
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        partial = branchcache(tipnode=last, tiprev=lrev,
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                              filteredhash=filteredhash)
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        partial.phaseshash = bin(cachekey[3]) # [CHANGE] read phaseshash
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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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        cl = repo.changelog
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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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            node = bin(node)
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            if not cl.hasnode(node):
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                raise ValueError('node %s does not exist' % hex(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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   190
    except KeyboardInterrupt:
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        raise
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    except Exception as inst:
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        if repo.ui.debugflag:
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   194
            msg = 'invalid branchheads cache'
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   195
            if repo.filtername is not None:
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   196
                msg += ' (%s)' % repo.filtername
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            msg += ': %s\n'
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   198
            repo.ui.debug(msg % inst)
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   199
        partial = None
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   200
    return partial