comparison mercurial/revlog.py @ 44313:6f9e8e142cea

nodemap: add a (python) index class for persistent nodemap testing

Using the persistent nodemap require a compeling performance boost and an
existing implementation. The benefit of the persistent nodemap for pure python
code is unclear and we don't have a C implementation for it. Yet we would like
to actually start testing it in more details and define an API for using that
persistent nodemap.

We introduce a new `devel` config option to use an index class dedicated to
Nodemap Testing. This feature is "pure" only because having using a pure-python
index with the `cext` policy proved more difficult than I would like.

There is nothing going on in that class for now, but the coming changeset will
change that.

Differential Revision: https://phab.mercurial-scm.org/D7840

44312:563dfdfd01a4

        if rev == 0:
            p = versionformat_pack(version) + p[4:]
        return p


class rustrevlogio(revlogio):
    def parseindex(self, data, inline):
        index, cache = super(rustrevlogio, self).parseindex(data, inline)
        return rustrevlog.MixedIndex(index), cache

        if not self._generaldelta:
            self._sparserevlog = False

        self._storedeltachains = True

        self._io = revlogio()
        if self.version == REVLOGV0:
            self._io = revlogoldio()
        elif rustrevlog is not None and self.opener.options.get(b'rust.index'):
            self._io = rustrevlogio()
        try:
            d = self._io.parseindex(indexdata, self._inline)
        except (ValueError, IndexError):

44313:6f9e8e142cea

        if rev == 0:
            p = versionformat_pack(version) + p[4:]
        return p


NodemapRevlogIO = None

if util.safehasattr(parsers, 'parse_index_devel_nodemap'):

    class NodemapRevlogIO(revlogio):
        """A debug oriented IO class that return a PersistentNodeMapIndexObject

        The PersistentNodeMapIndexObject object is meant to test the persistent nodemap feature.
        """

        def parseindex(self, data, inline):
            index, cache = parsers.parse_index_devel_nodemap(data, inline)
            return index, cache


class rustrevlogio(revlogio):
    def parseindex(self, data, inline):
        index, cache = super(rustrevlogio, self).parseindex(data, inline)
        return rustrevlog.MixedIndex(index), cache

        if not self._generaldelta:
            self._sparserevlog = False

        self._storedeltachains = True

        devel_nodemap = (
            self.nodemap_file
            and opts.get(b'devel-force-nodemap', False)
            and NodemapRevlogIO is not None
        )

        self._io = revlogio()
        if self.version == REVLOGV0:
            self._io = revlogoldio()
        elif devel_nodemap:
            self._io = NodemapRevlogIO()
        elif rustrevlog is not None and self.opener.options.get(b'rust.index'):
            self._io = rustrevlogio()
        try:
            d = self._io.parseindex(indexdata, self._inline)
        except (ValueError, IndexError):