Mercurial > hg
view tests/testlib/ext-sidedata-5.py @ 47072:4c041c71ec01
revlog: introduce an explicit tracking of what the revlog is about
Since the dawn of time, people have been forced to rely to lossy introspection
of the index filename to determine what the purpose and role of the revlog they
encounter is. This is hacky, error prone, inflexible, abstraction-leaky,
<insert-your-own-complaints-here>.
In f63299ee7e4d Raphaël introduced a new attribute to track this information:
`revlog_kind`. However it is initialized in an odd place and various instances
end up not having it set. In addition is only tracking some of the information
we end up having to introspect in various pieces of code.
So we add a new attribute that holds more data and is more strictly enforced.
This work is done in collaboration with Raphaël.
The `revlog_kind` one will be removed/adapted in the next changeset. We expect
to be able to clean up various existing piece of code and to simplify coming
work around the newer revlog format.
Differential Revision: https://phab.mercurial-scm.org/D10352
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Tue, 06 Apr 2021 05:20:24 +0200 |
parents | ba8e508a8e69 |
children | 64cd1496bb70 |
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# coding: utf8 # ext-sidedata-5.py - small extension to test (differently still) the sidedata # logic # # Simulates a server for a simple sidedata exchange. # # Copyright 2021 Raphaël Gomès <rgomes@octobus.net> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from __future__ import absolute_import import hashlib import struct from mercurial import ( extensions, revlog, ) from mercurial.revlogutils import sidedata as sidedatamod def compute_sidedata_1(repo, revlog, rev, sidedata, text=None): sidedata = sidedata.copy() if text is None: text = revlog.revision(rev) sidedata[sidedatamod.SD_TEST1] = struct.pack('>I', len(text)) return sidedata def compute_sidedata_2(repo, revlog, rev, sidedata, text=None): sidedata = sidedata.copy() if text is None: text = revlog.revision(rev) sha256 = hashlib.sha256(text).digest() sidedata[sidedatamod.SD_TEST2] = struct.pack('>32s', sha256) return sidedata def reposetup(ui, repo): # Sidedata keys happen to be the same as the categories, easier for testing. for kind in (b'changelog', b'manifest', b'filelog'): repo.register_sidedata_computer( kind, sidedatamod.SD_TEST1, (sidedatamod.SD_TEST1,), compute_sidedata_1, ) repo.register_sidedata_computer( kind, sidedatamod.SD_TEST2, (sidedatamod.SD_TEST2,), compute_sidedata_2, ) # We don't register sidedata computers because we don't care within these # tests repo.register_wanted_sidedata(sidedatamod.SD_TEST1) repo.register_wanted_sidedata(sidedatamod.SD_TEST2) def wrapaddrevision( orig, self, text, transaction, link, p1, p2, *args, **kwargs ): if kwargs.get('sidedata') is None: kwargs['sidedata'] = {} sd = kwargs['sidedata'] ## let's store some arbitrary data just for testing # text length sd[sidedatamod.SD_TEST1] = struct.pack('>I', len(text)) # and sha2 hashes sha256 = hashlib.sha256(text).digest() sd[sidedatamod.SD_TEST2] = struct.pack('>32s', sha256) return orig(self, text, transaction, link, p1, p2, *args, **kwargs) def extsetup(ui): extensions.wrapfunction(revlog.revlog, 'addrevision', wrapaddrevision)