Mercurial > hg
annotate mercurial/repocache.py @ 45203:ae5c1a3bc339
commitctx: extract the function in a dedicated module
the function have few callers (< 15) is quite long a mostly independent from the
repository itself. It seems like a good candidate to reduce the bloatness of the
localrepository class. Extracting it will help us cleaning the code up and
splitting it into more reasonable-size function.
We don't use a copy trick because the amount of code extract is quite small
(<5%) and the de-indent means every single line change anyway. So this is not
deemed valuable to do so.
This is part of a larger refactoring/cleanup of the commitctx code to clarify
and augment the logic gathering metadata useful for copy tracing. The current
code is a tad too long and entangled to make such update easy.
Differential Revision: https://phab.mercurial-scm.org/D8709
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Mon, 06 Jul 2020 23:14:52 +0200 |
parents | 8ff1ecfadcd1 |
children | 6000f5b25c9b |
rev | line source |
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1 # repocache.py - in-memory repository cache for long-running services |
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2 # |
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3 # Copyright 2018 Yuya Nishihara <yuya@tcha.org> |
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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 absolute_import |
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9 |
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10 import collections |
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11 import gc |
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12 import threading |
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13 |
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14 from . import ( |
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15 error, |
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16 hg, |
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17 obsolete, |
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18 scmutil, |
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19 util, |
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20 ) |
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21 |
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22 |
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23 class repoloader(object): |
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24 """Load repositories in background thread |
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25 |
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26 This is designed for a forking server. A cached repo cannot be obtained |
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27 until the server fork()s a worker and the loader thread stops. |
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28 """ |
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29 |
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30 def __init__(self, ui, maxlen): |
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31 self._ui = ui.copy() |
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32 self._cache = util.lrucachedict(max=maxlen) |
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33 # use deque and Event instead of Queue since deque can discard |
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34 # old items to keep at most maxlen items. |
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35 self._inqueue = collections.deque(maxlen=maxlen) |
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36 self._accepting = False |
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37 self._newentry = threading.Event() |
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38 self._thread = None |
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39 |
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40 def start(self): |
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41 assert not self._thread |
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42 if self._inqueue.maxlen == 0: |
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43 # no need to spawn loader thread as the cache is disabled |
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44 return |
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45 self._accepting = True |
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46 self._thread = threading.Thread(target=self._mainloop) |
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47 self._thread.start() |
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48 |
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49 def stop(self): |
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50 if not self._thread: |
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51 return |
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52 self._accepting = False |
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53 self._newentry.set() |
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54 self._thread.join() |
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55 self._thread = None |
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56 self._cache.clear() |
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57 self._inqueue.clear() |
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58 |
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59 def load(self, path): |
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60 """Request to load the specified repository in background""" |
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61 self._inqueue.append(path) |
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62 self._newentry.set() |
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63 |
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64 def get(self, path): |
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65 """Return a cached repo if available |
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66 |
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67 This function must be called after fork(), where the loader thread |
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68 is stopped. Otherwise, the returned repo might be updated by the |
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69 loader thread. |
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70 """ |
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71 if self._thread and self._thread.is_alive(): |
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72 raise error.ProgrammingError( |
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73 b'cannot obtain cached repo while loader is active' |
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74 ) |
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75 return self._cache.peek(path, None) |
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76 |
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77 def _mainloop(self): |
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78 while self._accepting: |
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79 # Avoid heavy GC after fork(), which would cancel the benefit of |
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80 # COW. We assume that GIL is acquired while GC is underway in the |
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81 # loader thread. If that isn't true, we might have to move |
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82 # gc.collect() to the main thread so that fork() would never stop |
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83 # the thread where GC is in progress. |
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84 gc.collect() |
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85 |
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86 self._newentry.wait() |
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87 while self._accepting: |
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88 self._newentry.clear() |
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89 try: |
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90 path = self._inqueue.popleft() |
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91 except IndexError: |
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92 break |
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93 scmutil.callcatch(self._ui, lambda: self._load(path)) |
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94 |
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95 def _load(self, path): |
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96 start = util.timer() |
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97 # TODO: repo should be recreated if storage configuration changed |
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98 try: |
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99 # pop before loading so inconsistent state wouldn't be exposed |
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100 repo = self._cache.pop(path) |
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101 except KeyError: |
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102 repo = hg.repository(self._ui, path).unfiltered() |
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103 _warmupcache(repo) |
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104 repo.ui.log( |
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105 b'repocache', |
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106 b'loaded repo into cache: %s (in %.3fs)\n', |
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107 path, |
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108 util.timer() - start, |
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109 ) |
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110 self._cache.insert(path, repo) |
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111 |
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112 |
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113 # TODO: think about proper API of preloading cache |
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114 def _warmupcache(repo): |
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115 repo.invalidateall() |
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116 repo.changelog |
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117 repo.obsstore._all |
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118 repo.obsstore.successors |
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119 repo.obsstore.predecessors |
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120 repo.obsstore.children |
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121 for name in obsolete.cachefuncs: |
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122 obsolete.getrevs(repo, name) |
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123 repo._phasecache.loadphaserevs(repo) |
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124 |
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125 |
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126 # TODO: think about proper API of attaching preloaded attributes |
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127 def copycache(srcrepo, destrepo): |
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128 """Copy cached attributes from srcrepo to destrepo""" |
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129 destfilecache = destrepo._filecache |
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130 srcfilecache = srcrepo._filecache |
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131 if b'changelog' in srcfilecache: |
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132 destfilecache[b'changelog'] = ce = srcfilecache[b'changelog'] |
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133 ce.obj.opener = ce.obj._realopener = destrepo.svfs |
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134 if b'obsstore' in srcfilecache: |
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135 destfilecache[b'obsstore'] = ce = srcfilecache[b'obsstore'] |
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136 ce.obj.svfs = destrepo.svfs |
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137 if b'_phasecache' in srcfilecache: |
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138 destfilecache[b'_phasecache'] = ce = srcfilecache[b'_phasecache'] |
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139 ce.obj.opener = destrepo.svfs |