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annotate hgext/fastannotate/support.py @ 39210:1ddb296e0dee

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fastannotate: initial import from Facebook's hg-experimental I made as few changes as I could to get the tests to pass, but this was a bit involved due to some churn in the blame code since someone last gave fastannotate any TLC. There's still follow-up work here to rip out support for old versions of hg and to integrate the protocol with modern standards. Some performance numbers (all on my 2016 MacBook Pro with a 2.6Ghz i7): Mercurial mercurial/manifest.py traditional blame time: real 1.050 secs (user 0.990+0.000 sys 0.060+0.000) build cache time: real 5.900 secs (user 5.720+0.000 sys 0.110+0.000) fastannotate time: real 0.120 secs (user 0.100+0.000 sys 0.020+0.000) Mercurial mercurial/localrepo.py traditional blame time: real 3.330 secs (user 3.220+0.000 sys 0.070+0.000) build cache time: real 30.610 secs (user 30.190+0.000 sys 0.230+0.000) fastannotate time: real 0.180 secs (user 0.160+0.000 sys 0.020+0.000) mozilla-central dom/ipc/ContentParent.cpp traditional blame time: real 7.640 secs (user 7.210+0.000 sys 0.380+0.000) build cache time: real 98.650 secs (user 97.000+0.000 sys 0.950+0.000) fastannotate time: real 1.580 secs (user 1.340+0.000 sys 0.240+0.000) mozilla-central dom/base/nsDocument.cpp traditional blame time: real 17.110 secs (user 16.490+0.000 sys 0.500+0.000) build cache time: real 399.750 secs (user 394.520+0.000 sys 2.610+0.000) fastannotate time: real 1.780 secs (user 1.530+0.000 sys 0.240+0.000) So building the cache is expensive (but might be faster with xdiff enabled), but the blame results are *way* faster. Differential Revision: https://phab.mercurial-scm.org/D3994
author Augie Fackler <augie@google.com>
date Mon, 30 Jul 2018 22:50:00 -0400
parents
children 303dae0136b0
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1 # Copyright 2016-present Facebook. All Rights Reserved.
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2 #
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3 # support: fastannotate support for hgweb, and filectx
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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 from mercurial import (
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11 context as hgcontext,
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12 dagop,
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13 extensions,
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14 hgweb,
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15 patch,
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16 util,
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17 )
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18
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19 from . import (
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20 context,
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21 revmap,
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22 )
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23
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24 class _lazyfctx(object):
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25 """delegates to fctx but do not construct fctx when unnecessary"""
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26
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27 def __init__(self, repo, node, path):
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28 self._node = node
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29 self._path = path
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30 self._repo = repo
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31
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32 def node(self):
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33 return self._node
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34
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35 def path(self):
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36 return self._path
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37
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38 @util.propertycache
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39 def _fctx(self):
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40 return context.resolvefctx(self._repo, self._node, self._path)
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41
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42 def __getattr__(self, name):
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43 return getattr(self._fctx, name)
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44
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45 def _convertoutputs(repo, annotated, contents):
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46 """convert fastannotate outputs to vanilla annotate format"""
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47 # fastannotate returns: [(nodeid, linenum, path)], [linecontent]
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48 # convert to what fctx.annotate returns: [annotateline]
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49 results = []
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50 fctxmap = {}
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51 annotateline = dagop.annotateline
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52 for i, (hsh, linenum, path) in enumerate(annotated):
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53 if (hsh, path) not in fctxmap:
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54 fctxmap[(hsh, path)] = _lazyfctx(repo, hsh, path)
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55 # linenum: the user wants 1-based, we have 0-based.
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56 lineno = linenum + 1
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57 fctx = fctxmap[(hsh, path)]
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58 line = contents[i]
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59 results.append(annotateline(fctx=fctx, lineno=lineno, text=line))
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60 return results
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61
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62 def _getmaster(fctx):
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63 """(fctx) -> str"""
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64 return fctx._repo.ui.config('fastannotate', 'mainbranch') or 'default'
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65
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66 def _doannotate(fctx, follow=True, diffopts=None):
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67 """like the vanilla fctx.annotate, but do it via fastannotate, and make
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68 the output format compatible with the vanilla fctx.annotate.
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69 may raise Exception, and always return line numbers.
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70 """
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71 master = _getmaster(fctx)
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72 annotated = contents = None
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73
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74 with context.fctxannotatecontext(fctx, follow, diffopts) as ac:
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75 try:
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76 annotated, contents = ac.annotate(fctx.rev(), master=master,
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77 showpath=True, showlines=True)
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78 except Exception:
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79 ac.rebuild() # try rebuild once
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80 fctx._repo.ui.debug('fastannotate: %s: rebuilding broken cache\n'
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81 % fctx._path)
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82 try:
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83 annotated, contents = ac.annotate(fctx.rev(), master=master,
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84 showpath=True, showlines=True)
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85 except Exception:
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86 raise
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87
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88 assert annotated and contents
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89 return _convertoutputs(fctx._repo, annotated, contents)
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90
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91 def _hgwebannotate(orig, fctx, ui):
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92 diffopts = patch.difffeatureopts(ui, untrusted=True,
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93 section='annotate', whitespace=True)
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94 return _doannotate(fctx, diffopts=diffopts)
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95
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96 def _fctxannotate(orig, self, follow=False, linenumber=False, skiprevs=None,
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97 diffopts=None):
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98 if skiprevs:
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99 # skiprevs is not supported yet
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100 return orig(self, follow, linenumber, skiprevs=skiprevs,
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101 diffopts=diffopts)
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102 try:
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103 return _doannotate(self, follow, diffopts)
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104 except Exception as ex:
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105 self._repo.ui.debug('fastannotate: falling back to the vanilla '
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106 'annotate: %r\n' % ex)
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107 return orig(self, follow=follow, skiprevs=skiprevs,
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108 diffopts=diffopts)
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109
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110 def _remotefctxannotate(orig, self, follow=False, skiprevs=None, diffopts=None):
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111 # skipset: a set-like used to test if a fctx needs to be downloaded
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112 skipset = None
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113 with context.fctxannotatecontext(self, follow, diffopts) as ac:
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114 skipset = revmap.revmap(ac.revmappath)
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115 return orig(self, follow, skiprevs=skiprevs, diffopts=diffopts,
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116 prefetchskip=skipset)
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117
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118 def replacehgwebannotate():
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119 extensions.wrapfunction(hgweb.webutil, 'annotate', _hgwebannotate)
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120
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121 def replacefctxannotate():
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122 extensions.wrapfunction(hgcontext.basefilectx, 'annotate', _fctxannotate)
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123
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124 def replaceremotefctxannotate():
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125 try:
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126 r = extensions.find('remotefilelog')
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127 except KeyError:
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128 return
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129 else:
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130 extensions.wrapfunction(r.remotefilectx.remotefilectx, 'annotate',
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131 _remotefctxannotate)