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annotate tests/testlib/ext-sidedata-3.py @ 46718:ba8e508a8e69

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sidedata-exchange: rewrite sidedata on-the-fly whenever possible When a A exchanges with B, the difference of their supported sidedata categories is made, and the responsibility is always with the client to generated it: - If A pushes to B and B requires category `foo` that A does not have, A will need to generate it when sending it to B. - If A pulls from B and A needs category `foo`, it will generate `foo` before the end of the transaction. - Any category that is not required is removed. If peers are not compatible, abort. It is forbidden to rewrite sidedata for a rev that already has sidedata, since that would introduce unreachable (garbage) data in the data file, something we're not prepared for yet. Differential Revision: https://phab.mercurial-scm.org/D10032
author Rapha?l Gom?s <rgomes@octobus.net>
date Fri, 19 Feb 2021 11:24:50 +0100
parents tests/testlib/ext-sidedata.py@3d740058b467
children 64cd1496bb70
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1 # coding: utf8
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2 # ext-sidedata-3.py - small extension to test (differently still) the sidedata
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3 # logic
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4 #
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5 # Simulates a client for a complex sidedata exchange.
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6 #
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7 # Copyright 2021 Raphaël Gomès <rgomes@octobus.net>
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8 #
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9 # This software may be used and distributed according to the terms of the
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10 # GNU General Public License version 2 or any later version.
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11
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12 from __future__ import absolute_import
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13
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14 import hashlib
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15 import struct
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16
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17 from mercurial import (
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18 extensions,
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19 revlog,
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20 )
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21
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22 from mercurial.revlogutils import sidedata as sidedatamod
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23
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24
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25 def compute_sidedata_1(repo, revlog, rev, sidedata, text=None):
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26 sidedata = sidedata.copy()
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27 if text is None:
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28 text = revlog.revision(rev)
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29 sidedata[sidedatamod.SD_TEST1] = struct.pack('>I', len(text))
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30 return sidedata
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31
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32
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33 def compute_sidedata_2(repo, revlog, rev, sidedata, text=None):
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34 sidedata = sidedata.copy()
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35 if text is None:
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36 text = revlog.revision(rev)
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37 sha256 = hashlib.sha256(text).digest()
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38 sidedata[sidedatamod.SD_TEST2] = struct.pack('>32s', sha256)
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39 return sidedata
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40
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41
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42 def compute_sidedata_3(repo, revlog, rev, sidedata, text=None):
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43 sidedata = sidedata.copy()
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44 if text is None:
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45 text = revlog.revision(rev)
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46 sha384 = hashlib.sha384(text).digest()
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47 sidedata[sidedatamod.SD_TEST3] = struct.pack('>48s', sha384)
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48 return sidedata
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49
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50
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51 def wrapaddrevision(
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52 orig, self, text, transaction, link, p1, p2, *args, **kwargs
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53 ):
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54 if kwargs.get('sidedata') is None:
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55 kwargs['sidedata'] = {}
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56 sd = kwargs['sidedata']
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57 sd = compute_sidedata_1(None, self, None, sd, text=text)
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58 kwargs['sidedata'] = compute_sidedata_2(None, self, None, sd, text=text)
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59 return orig(self, text, transaction, link, p1, p2, *args, **kwargs)
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60
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61
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62 def extsetup(ui):
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63 extensions.wrapfunction(revlog.revlog, 'addrevision', wrapaddrevision)
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64
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65
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66 def reposetup(ui, repo):
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67 # Sidedata keys happen to be the same as the categories, easier for testing.
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68 for kind in (b'changelog', b'manifest', b'filelog'):
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69 repo.register_sidedata_computer(
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70 kind,
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71 sidedatamod.SD_TEST1,
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72 (sidedatamod.SD_TEST1,),
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73 compute_sidedata_1,
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74 )
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75 repo.register_sidedata_computer(
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76 kind,
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77 sidedatamod.SD_TEST2,
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78 (sidedatamod.SD_TEST2,),
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79 compute_sidedata_2,
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80 )
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81 repo.register_sidedata_computer(
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82 kind,
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83 sidedatamod.SD_TEST3,
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84 (sidedatamod.SD_TEST3,),
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85 compute_sidedata_3,
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86 )
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87 repo.register_wanted_sidedata(sidedatamod.SD_TEST1)
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88 repo.register_wanted_sidedata(sidedatamod.SD_TEST2)