Mercurial > hg
annotate mercurial/repocache.py @ 42437:9609430d3625
rust-filepatterns: use bytes instead of String
In my initial patch, I introduced an unnecessary hard constraint on UTF-8
filenames and patterns which I forgot to remove. Although the performance
penalty for using String might be negligible, we don't want to break
compatibility with non-UTF-8 encodings for no reason.
Moreover, this change allows for a cleaner Rust core API.
This patch introduces a new utils module that is used with this fix.
Finally, PatternError was not put inside the Python module generated by
Rust, which would have raised a NameError.
Differential Revision: https://phab.mercurial-scm.org/D6485
author | Raphaël Gomès <rgomes@octobus.net> |
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date | Thu, 06 Jun 2019 15:30:56 +0200 |
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children | 2372284d9457 |
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 class repoloader(object): |
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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(b'cannot obtain cached repo while ' |
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72 b'loader is active') |
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73 return self._cache.peek(path, None) |
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74 |
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75 def _mainloop(self): |
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76 while self._accepting: |
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77 # Avoid heavy GC after fork(), which would cancel the benefit of |
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78 # COW. We assume that GIL is acquired while GC is underway in the |
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79 # loader thread. If that isn't true, we might have to move |
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80 # gc.collect() to the main thread so that fork() would never stop |
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81 # the thread where GC is in progress. |
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82 gc.collect() |
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83 |
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84 self._newentry.wait() |
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85 while self._accepting: |
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86 self._newentry.clear() |
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87 try: |
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88 path = self._inqueue.popleft() |
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89 except IndexError: |
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90 break |
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91 scmutil.callcatch(self._ui, lambda: self._load(path)) |
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92 |
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93 def _load(self, path): |
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94 start = util.timer() |
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95 # TODO: repo should be recreated if storage configuration changed |
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96 try: |
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97 # pop before loading so inconsistent state wouldn't be exposed |
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98 repo = self._cache.pop(path) |
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99 except KeyError: |
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100 repo = hg.repository(self._ui, path).unfiltered() |
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101 _warmupcache(repo) |
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102 repo.ui.log(b'repocache', b'loaded repo into cache: %s (in %.3fs)\n', |
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103 path, util.timer() - start) |
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104 self._cache.insert(path, repo) |
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105 |
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106 # TODO: think about proper API of preloading cache |
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107 def _warmupcache(repo): |
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108 repo.invalidateall() |
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109 repo.changelog |
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110 repo.obsstore._all |
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111 repo.obsstore.successors |
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112 repo.obsstore.predecessors |
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113 repo.obsstore.children |
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114 for name in obsolete.cachefuncs: |
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115 obsolete.getrevs(repo, name) |
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116 repo._phasecache.loadphaserevs(repo) |
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117 |
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118 # TODO: think about proper API of attaching preloaded attributes |
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119 def copycache(srcrepo, destrepo): |
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120 """Copy cached attributes from srcrepo to destrepo""" |
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121 destfilecache = destrepo._filecache |
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122 srcfilecache = srcrepo._filecache |
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123 if 'changelog' in srcfilecache: |
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124 destfilecache['changelog'] = ce = srcfilecache['changelog'] |
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125 ce.obj.opener = ce.obj._realopener = destrepo.svfs |
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126 if 'obsstore' in srcfilecache: |
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127 destfilecache['obsstore'] = ce = srcfilecache['obsstore'] |
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128 ce.obj.svfs = destrepo.svfs |
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129 if '_phasecache' in srcfilecache: |
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130 destfilecache['_phasecache'] = ce = srcfilecache['_phasecache'] |
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131 ce.obj.opener = destrepo.svfs |