upstream/mercurial-mirror Files · tests/testlib/ext-sidedata-2.py

revlog: introduce an explicit tracking of what the revlog is about...

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 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

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      # coding: utf8

      # ext-sidedata-2.py - small extension to test (differently) the sidedata logic

      #

      # Simulates a client for a complex 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.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,

              )

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				# coding: utf8
				# ext-sidedata-2.py - small extension to test (differently) the sidedata logic
				#
				# Simulates a client for a complex 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.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,
				)