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annotate mercurial/dirstateutils/timestamp.py @ 52052:7ea1cb46b590

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timestamp: add type information to the module This is easy to do and helps both Pytype and developpers understand what objects they are dealing with.
author Rapha?l Gom?s <rgomes@octobus.net>
date Wed, 16 Oct 2024 18:40:59 +0200
parents f4733654f144
children 572d80e51094
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # Copyright Mercurial Contributors
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2 #
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3 # This software may be used and distributed according to the terms of the
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4 # GNU General Public License version 2 or any later version.
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5
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6 from __future__ import annotations
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7
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8 import functools
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9 import os
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10 import stat
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11 import time
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12 from typing import Optional, Tuple
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13
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14 from .. import error
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15
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16
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17 rangemask = 0x7FFFFFFF
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18
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19
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20 @functools.total_ordering
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21 class timestamp(tuple):
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22 """
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23 A Unix timestamp with optional nanoseconds precision,
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24 modulo 2**31 seconds.
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25
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26 A 3-tuple containing:
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27
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28 `truncated_seconds`: seconds since the Unix epoch,
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29 truncated to its lower 31 bits
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30
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31 `subsecond_nanoseconds`: number of nanoseconds since `truncated_seconds`.
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32 When this is zero, the sub-second precision is considered unknown.
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33
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34 `second_ambiguous`: whether this timestamp is still "reliable"
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35 (see `reliable_mtime_of`) if we drop its sub-second component.
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36 """
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37
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38 def __new__(cls, value):
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39 truncated_seconds, subsec_nanos, second_ambiguous = value
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40 value = (truncated_seconds & rangemask, subsec_nanos, second_ambiguous)
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41 return super(timestamp, cls).__new__(cls, value)
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42
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43 def __eq__(self, other):
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44 raise error.ProgrammingError(
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45 'timestamp should never be compared directly'
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46 )
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47
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48 def __gt__(self, other):
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49 raise error.ProgrammingError(
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50 'timestamp should never be compared directly'
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51 )
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52
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53
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54 def get_fs_now(vfs) -> Optional[timestamp]:
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55 """return a timestamp for "now" in the current vfs
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56
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57 This will raise an exception if no temporary files could be created.
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58 """
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59 tmpfd, tmpname = vfs.mkstemp()
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60 try:
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61 return mtime_of(os.fstat(tmpfd))
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62 finally:
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63 os.close(tmpfd)
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64 vfs.unlink(tmpname)
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65
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66
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67 def zero() -> timestamp:
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68 """
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69 Returns the `timestamp` at the Unix epoch.
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70 """
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71 return tuple.__new__(timestamp, (0, 0))
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72
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73
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74 def mtime_of(stat_result: os.stat_result) -> timestamp:
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75 """
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76 Takes an `os.stat_result`-like object and returns a `timestamp` object
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77 for its modification time.
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78 """
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79 try:
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80 # TODO: add this attribute to `osutil.stat` objects,
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81 # see `mercurial/cext/osutil.c`.
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82 #
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83 # This attribute is also not available on Python 2.
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84 nanos = stat_result.st_mtime_ns
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85 except AttributeError:
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86 # https://docs.python.org/2/library/os.html#os.stat_float_times
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87 # "For compatibility with older Python versions,
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88 # accessing stat_result as a tuple always returns integers."
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89 secs = stat_result[stat.ST_MTIME]
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90
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91 subsec_nanos = 0
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92 else:
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93 billion = int(1e9)
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94 secs = nanos // billion
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95 subsec_nanos = nanos % billion
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96
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97 return timestamp((secs, subsec_nanos, False))
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98
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99
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100 def reliable_mtime_of(
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101 stat_result: os.stat_result, present_mtime: timestamp
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102 ) -> Optional[timestamp]:
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103 """Same as `mtime_of`, but return `None` or a `Timestamp` with
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104 `second_ambiguous` set if the date might be ambiguous.
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105
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106 A modification time is reliable if it is older than "present_time" (or
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107 sufficiently in the future).
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108
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109 Otherwise a concurrent modification might happens with the same mtime.
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110 """
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111 file_mtime = mtime_of(stat_result)
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112 file_second = file_mtime[0]
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113 file_ns = file_mtime[1]
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114 boundary_second = present_mtime[0]
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115 boundary_ns = present_mtime[1]
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116 # If the mtime of the ambiguous file is younger (or equal) to the starting
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117 # point of the `status` walk, we cannot garantee that another, racy, write
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118 # will not happen right after with the same mtime and we cannot cache the
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119 # information.
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120 #
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121 # However if the mtime is far away in the future, this is likely some
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122 # mismatch between the current clock and previous file system operation. So
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parents: 48379
diff changeset
123 # mtime more than one days in the future are considered fine.
48403
ca42667c8d26 status: keep second-ambiguous mtimes during fixup
Pierre-Yves David <pierre-yves.david@octobus.net>
parents: 48398
diff changeset
124 if boundary_second == file_second:
ca42667c8d26 status: keep second-ambiguous mtimes during fixup
Pierre-Yves David <pierre-yves.david@octobus.net>
parents: 48398
diff changeset
125 if file_ns and boundary_ns:
ca42667c8d26 status: keep second-ambiguous mtimes during fixup
Pierre-Yves David <pierre-yves.david@octobus.net>
parents: 48398
diff changeset
126 if file_ns < boundary_ns:
ca42667c8d26 status: keep second-ambiguous mtimes during fixup
Pierre-Yves David <pierre-yves.david@octobus.net>
parents: 48398
diff changeset
127 return timestamp((file_second, file_ns, True))
ca42667c8d26 status: keep second-ambiguous mtimes during fixup
Pierre-Yves David <pierre-yves.david@octobus.net>
parents: 48398
diff changeset
128 return None
ca42667c8d26 status: keep second-ambiguous mtimes during fixup
Pierre-Yves David <pierre-yves.david@octobus.net>
parents: 48398
diff changeset
129 elif boundary_second < file_second < (3600 * 24 + boundary_second):
48395
9ae0353c9f5d status: move the boundary comparison logic within the timestamp module
Pierre-Yves David <pierre-yves.david@octobus.net>
parents: 48379
diff changeset
130 return None
9ae0353c9f5d status: move the boundary comparison logic within the timestamp module
Pierre-Yves David <pierre-yves.david@octobus.net>
parents: 48379
diff changeset
131 else:
9ae0353c9f5d status: move the boundary comparison logic within the timestamp module
Pierre-Yves David <pierre-yves.david@octobus.net>
parents: 48379
diff changeset
132 return file_mtime