Mercurial > hg
annotate mercurial/repocache.py @ 51106:d83d788590a8
changelog-delay: move the delay/divert logic inside the (inner) revlog
Instead of hacking throught the vfs/opener, we implement the delay/divert logic
inside the `_InnerRevlog` and `randomaccessfile` object. This will allow to an
alternative implementation of the `_InnerRevlog` that does not need to use Python details.
As a result, the new implementation can use the transaction less agressively
and avoid some extra output since no data had been written yet. That seems like
a good side effect.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Tue, 24 Oct 2023 11:08:49 +0200 |
parents | 642e31cb55f0 |
children | 630d5283ee82 |
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 |
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9 import collections |
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10 import gc |
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11 import threading |
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12 |
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13 from . import ( |
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14 error, |
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15 hg, |
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16 obsolete, |
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17 scmutil, |
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18 util, |
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19 ) |
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20 |
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21 |
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22 class repoloader: |
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23 """Load repositories in background thread |
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24 |
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25 This is designed for a forking server. A cached repo cannot be obtained |
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26 until the server fork()s a worker and the loader thread stops. |
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27 """ |
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28 |
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29 def __init__(self, ui, maxlen): |
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30 self._ui = ui.copy() |
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31 self._cache = util.lrucachedict(max=maxlen) |
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32 # use deque and Event instead of Queue since deque can discard |
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33 # old items to keep at most maxlen items. |
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34 self._inqueue = collections.deque(maxlen=maxlen) |
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35 self._accepting = False |
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36 self._newentry = threading.Event() |
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37 self._thread = None |
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38 |
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39 def start(self): |
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40 assert not self._thread |
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41 if self._inqueue.maxlen == 0: |
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42 # no need to spawn loader thread as the cache is disabled |
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43 return |
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44 self._accepting = True |
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45 self._thread = threading.Thread(target=self._mainloop) |
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46 self._thread.start() |
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47 |
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48 def stop(self): |
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49 if not self._thread: |
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50 return |
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51 self._accepting = False |
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52 self._newentry.set() |
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53 self._thread.join() |
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54 self._thread = None |
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55 self._cache.clear() |
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56 self._inqueue.clear() |
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57 |
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58 def load(self, path): |
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59 """Request to load the specified repository in background""" |
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60 self._inqueue.append(path) |
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61 self._newentry.set() |
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62 |
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63 def get(self, path): |
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64 """Return a cached repo if available |
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65 |
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66 This function must be called after fork(), where the loader thread |
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67 is stopped. Otherwise, the returned repo might be updated by the |
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68 loader thread. |
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69 """ |
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70 if self._thread and self._thread.is_alive(): |
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71 raise error.ProgrammingError( |
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72 b'cannot obtain cached repo while loader is active' |
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73 ) |
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74 return self._cache.peek(path, None) |
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75 |
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76 def _mainloop(self): |
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77 while self._accepting: |
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78 # Avoid heavy GC after fork(), which would cancel the benefit of |
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79 # COW. We assume that GIL is acquired while GC is underway in the |
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80 # loader thread. If that isn't true, we might have to move |
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81 # gc.collect() to the main thread so that fork() would never stop |
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82 # the thread where GC is in progress. |
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83 gc.collect() |
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84 |
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85 self._newentry.wait() |
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86 while self._accepting: |
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87 self._newentry.clear() |
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88 try: |
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89 path = self._inqueue.popleft() |
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90 except IndexError: |
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91 break |
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92 scmutil.callcatch(self._ui, lambda: self._load(path)) |
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93 |
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94 def _load(self, path): |
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95 start = util.timer() |
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96 # TODO: repo should be recreated if storage configuration changed |
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97 try: |
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98 # pop before loading so inconsistent state wouldn't be exposed |
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99 repo = self._cache.pop(path) |
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100 except KeyError: |
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101 repo = hg.repository(self._ui, path).unfiltered() |
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102 _warmupcache(repo) |
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103 repo.ui.log( |
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104 b'repocache', |
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105 b'loaded repo into cache: %s (in %.3fs)\n', |
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106 path, |
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107 util.timer() - start, |
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108 ) |
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109 self._cache.insert(path, repo) |
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110 |
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111 |
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112 # TODO: think about proper API of preloading cache |
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113 def _warmupcache(repo): |
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114 repo.invalidateall() |
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115 repo.changelog |
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116 repo.obsstore._all |
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117 repo.obsstore.successors |
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118 repo.obsstore.predecessors |
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119 repo.obsstore.children |
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120 for name in obsolete.cachefuncs: |
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121 obsolete.getrevs(repo, name) |
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122 repo._phasecache.loadphaserevs(repo) |
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123 |
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124 |
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125 # TODO: think about proper API of attaching preloaded attributes |
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126 def copycache(srcrepo, destrepo): |
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127 """Copy cached attributes from srcrepo to destrepo""" |
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128 destfilecache = destrepo._filecache |
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129 srcfilecache = srcrepo._filecache |
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130 if b'changelog' in srcfilecache: |
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131 destfilecache[b'changelog'] = ce = srcfilecache[b'changelog'] |
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132 ce.obj.opener = ce.obj._inner.opener = destrepo.svfs |
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133 if b'obsstore' in srcfilecache: |
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134 destfilecache[b'obsstore'] = ce = srcfilecache[b'obsstore'] |
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135 ce.obj.svfs = destrepo.svfs |
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136 if b'_phasecache' in srcfilecache: |
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137 destfilecache[b'_phasecache'] = ce = srcfilecache[b'_phasecache'] |
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138 ce.obj.opener = destrepo.svfs |