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annotate mercurial/revlogutils/__init__.py @ 52049:af54626bf358

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dirstate-map: add a missing debug wait point when accessing the v2 docket fc8e37c380d3 added synchronization points to the dirstate to allow for race condition testing without actually requiring a time-based race condition to happen. This changes adds the `pre-read-file` wait point before we read the docket, since callers might ask for the parents before anything else is read, leading to the first read being done before the wait point. This removes some differences in test output which were presumed to be speed related, but weren't.
author Rapha?l Gom?s <rgomes@octobus.net>
date Mon, 14 Oct 2024 14:14:21 +0200
parents f4733654f144
children
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1 # mercurial.revlogutils -- basic utilities for revlog
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2 #
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3 # Copyright 2019 Pierre-Yves David <pierre-yves.david@octobus.net>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 from __future__ import annotations
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9
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10 import typing
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11
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12 from ..thirdparty import attr
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13
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14 # Force pytype to use the non-vendored package
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15 if typing.TYPE_CHECKING:
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16 # noinspection PyPackageRequirements
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17 import attr
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18
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19 from ..interfaces import repository
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20
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21 # See mercurial.revlogutils.constants for doc
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22 COMP_MODE_INLINE = 2
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23 RANK_UNKNOWN = -1
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24
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25
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26 def offset_type(offset, type):
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27 if (type & ~repository.REVISION_FLAGS_KNOWN) != 0:
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28 raise ValueError(b'unknown revlog index flags: %d' % type)
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29 return int(int(offset) << 16 | type)
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30
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31
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32 def entry(
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33 data_offset,
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34 data_compressed_length,
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35 data_delta_base,
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36 link_rev,
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37 parent_rev_1,
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38 parent_rev_2,
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39 node_id,
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40 flags=0,
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41 data_uncompressed_length=-1,
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42 data_compression_mode=COMP_MODE_INLINE,
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43 sidedata_offset=0,
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44 sidedata_compressed_length=0,
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45 sidedata_compression_mode=COMP_MODE_INLINE,
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46 rank=RANK_UNKNOWN,
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47 ):
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48 """Build one entry from symbolic name
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49
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50 This is useful to abstract the actual detail of how we build the entry
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51 tuple for caller who don't care about it.
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52
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53 This should always be called using keyword arguments. Some arguments have
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54 default value, this match the value used by index version that does not store such data.
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55 """
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56 return (
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57 offset_type(data_offset, flags),
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58 data_compressed_length,
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59 data_uncompressed_length,
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60 data_delta_base,
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61 link_rev,
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62 parent_rev_1,
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63 parent_rev_2,
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64 node_id,
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65 sidedata_offset,
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66 sidedata_compressed_length,
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67 data_compression_mode,
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68 sidedata_compression_mode,
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69 rank,
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70 )
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71
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72
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73 @attr.s(slots=True, frozen=True)
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74 class revisioninfo:
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75 """Information about a revision that allows building its fulltext
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76 node: expected hash of the revision
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77 p1, p2: parent revs of the revision (as node)
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78 btext: built text cache consisting of a one-element list
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79 cachedelta: (baserev, uncompressed_delta, usage_mode) or None
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80 flags: flags associated to the revision storage
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81
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82 One of btext[0] or cachedelta must be set.
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83 """
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84
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85 node = attr.ib()
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86 p1 = attr.ib()
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87 p2 = attr.ib()
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88 btext = attr.ib()
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89 textlen = attr.ib()
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90 cachedelta = attr.ib()
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91 flags = attr.ib()