tests/testlib/ext-sidedata-3.py

dirstate: drop the now unused magic constants for the dirstate module

We no longer need them for the dirstate logic. We only need them in the
dirstate map (and parsers) logic.

This smell like progress.

Differential Revision: https://phab.mercurial-scm.org/D10964

# coding: utf8
# ext-sidedata-3.py - small extension to test (differently still) the sidedata
# logic
#
# Simulates a client for a complex sidedata exchange.
#
# Copyright 2021 Raphaël Gomès <[e-mail]>
#
# 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
from mercurial.revlogutils import constants

NO_FLAGS = (0, 0)


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, NO_FLAGS


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, NO_FLAGS


def compute_sidedata_3(repo, revlog, rev, sidedata, text=None):
    sidedata = sidedata.copy()
    if text is None:
        text = revlog.revision(rev)
    sha384 = hashlib.sha384(text).digest()
    sidedata[sidedatamod.SD_TEST3] = struct.pack('>48s', sha384)
    return sidedata, NO_FLAGS


def wrapaddrevision(
    orig, self, text, transaction, link, p1, p2, *args, **kwargs
):
    if kwargs.get('sidedata') is None:
        kwargs['sidedata'] = {}
    sd = kwargs['sidedata']
    sd, flags = compute_sidedata_1(None, self, None, sd, text=text)
    kwargs['sidedata'] = compute_sidedata_2(None, self, None, sd, text=text)[0]
    return orig(self, text, transaction, link, p1, p2, *args, **kwargs)


def extsetup(ui):
    extensions.wrapfunction(revlog.revlog, 'addrevision', wrapaddrevision)


def reposetup(ui, repo):
    # Sidedata keys happen to be the same as the categories, easier for testing.
    for kind in constants.ALL_KINDS:
        repo.register_sidedata_computer(
            kind,
            sidedatamod.SD_TEST1,
            (sidedatamod.SD_TEST1,),
            compute_sidedata_1,
            0,
        )
        repo.register_sidedata_computer(
            kind,
            sidedatamod.SD_TEST2,
            (sidedatamod.SD_TEST2,),
            compute_sidedata_2,
            0,
        )
        repo.register_sidedata_computer(
            kind,
            sidedatamod.SD_TEST3,
            (sidedatamod.SD_TEST3,),
            compute_sidedata_3,
            0,
        )
    repo.register_wanted_sidedata(sidedatamod.SD_TEST1)
    repo.register_wanted_sidedata(sidedatamod.SD_TEST2)