Mercurial > hg
annotate mercurial/branchmap.py @ 33766:4c706037adef
wireproto: overhaul iterating batcher code (API)
The remote batching code is difficult to read. Let's improve it.
As part of the refactor, the future returned by method calls on
batchiter() instances is now populated. However, you still need to
consume the results() generator for the future to be set. But at
least now we can stuff the future somewhere and not have to worry
about aligning method call order with result order since you can
use a future to hold the result.
Also as part of the change, we now verify that @batchable generators
yield exactly 2 values. In other words, we enforce their API.
The non-iter batcher has been unused since b6e71f8af5b8. And to my
surprise we had no explicit unit test coverage of it! test-batching.py
has been overhauled to use the iterating batcher.
Since the iterating batcher doesn't allow non-batchable method
calls nor local calls, tests have been updated to reflect reality.
The iterating batcher has been used for multiple releases apparently
without major issue. So this shouldn't cause alarm.
.. api::
@peer.batchable functions must now yield exactly 2 values
Differential Revision: https://phab.mercurial-scm.org/D319
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Wed, 09 Aug 2017 23:29:30 -0700 |
parents | 755e6532e81d |
children | 1814ca418b30 |
rev | line source |
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1 # branchmap.py - logic to computes, maintain and stores branchmap for local repo |
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2 # |
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3 # Copyright 2005-2007 Matt Mackall <mpm@selenic.com> |
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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 struct |
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11 |
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12 from .node import ( |
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13 bin, |
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14 hex, |
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15 nullid, |
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16 nullrev, |
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17 ) |
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18 from . import ( |
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19 encoding, |
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20 error, |
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21 scmutil, |
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22 util, |
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23 ) |
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24 |
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25 calcsize = struct.calcsize |
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26 pack_into = struct.pack_into |
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27 unpack_from = struct.unpack_from |
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28 |
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29 def _filename(repo): |
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30 """name of a branchcache file for a given repo or repoview""" |
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31 filename = "branch2" |
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32 if repo.filtername: |
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33 filename = '%s-%s' % (filename, repo.filtername) |
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34 return filename |
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35 |
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36 def read(repo): |
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37 try: |
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38 f = repo.cachevfs(_filename(repo)) |
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39 lines = f.read().split('\n') |
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40 f.close() |
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41 except (IOError, OSError): |
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42 return None |
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43 |
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44 try: |
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45 cachekey = lines.pop(0).split(" ", 2) |
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46 last, lrev = cachekey[:2] |
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47 last, lrev = bin(last), int(lrev) |
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48 filteredhash = None |
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49 if len(cachekey) > 2: |
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50 filteredhash = bin(cachekey[2]) |
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51 partial = branchcache(tipnode=last, tiprev=lrev, |
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52 filteredhash=filteredhash) |
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53 if not partial.validfor(repo): |
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54 # invalidate the cache |
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55 raise ValueError('tip differs') |
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56 cl = repo.changelog |
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57 for l in lines: |
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58 if not l: |
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59 continue |
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60 node, state, label = l.split(" ", 2) |
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61 if state not in 'oc': |
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62 raise ValueError('invalid branch state') |
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63 label = encoding.tolocal(label.strip()) |
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64 node = bin(node) |
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65 if not cl.hasnode(node): |
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66 raise ValueError('node %s does not exist' % hex(node)) |
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67 partial.setdefault(label, []).append(node) |
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68 if state == 'c': |
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69 partial._closednodes.add(node) |
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70 except Exception as inst: |
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71 if repo.ui.debugflag: |
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72 msg = 'invalid branchheads cache' |
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73 if repo.filtername is not None: |
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74 msg += ' (%s)' % repo.filtername |
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75 msg += ': %s\n' |
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76 repo.ui.debug(msg % inst) |
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77 partial = None |
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78 return partial |
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79 |
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80 ### Nearest subset relation |
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81 # Nearest subset of filter X is a filter Y so that: |
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82 # * Y is included in X, |
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83 # * X - Y is as small as possible. |
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84 # This create and ordering used for branchmap purpose. |
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85 # the ordering may be partial |
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86 subsettable = {None: 'visible', |
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87 'visible': 'served', |
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88 'served': 'immutable', |
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89 'immutable': 'base'} |
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90 |
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91 def updatecache(repo): |
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92 cl = repo.changelog |
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93 filtername = repo.filtername |
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94 partial = repo._branchcaches.get(filtername) |
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95 |
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96 revs = [] |
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97 if partial is None or not partial.validfor(repo): |
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98 partial = read(repo) |
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99 if partial is None: |
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100 subsetname = subsettable.get(filtername) |
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101 if subsetname is None: |
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102 partial = branchcache() |
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103 else: |
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104 subset = repo.filtered(subsetname) |
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105 partial = subset.branchmap().copy() |
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106 extrarevs = subset.changelog.filteredrevs - cl.filteredrevs |
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107 revs.extend(r for r in extrarevs if r <= partial.tiprev) |
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108 revs.extend(cl.revs(start=partial.tiprev + 1)) |
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109 if revs: |
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110 partial.update(repo, revs) |
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111 partial.write(repo) |
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112 |
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113 assert partial.validfor(repo), filtername |
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114 repo._branchcaches[repo.filtername] = partial |
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115 |
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116 def replacecache(repo, bm): |
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117 """Replace the branchmap cache for a repo with a branch mapping. |
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118 |
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119 This is likely only called during clone with a branch map from a remote. |
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120 """ |
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121 rbheads = [] |
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122 closed = [] |
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123 for bheads in bm.itervalues(): |
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124 rbheads.extend(bheads) |
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125 for h in bheads: |
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126 r = repo.changelog.rev(h) |
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127 b, c = repo.changelog.branchinfo(r) |
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128 if c: |
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129 closed.append(h) |
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130 |
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131 if rbheads: |
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132 rtiprev = max((int(repo.changelog.rev(node)) |
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133 for node in rbheads)) |
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134 cache = branchcache(bm, |
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135 repo[rtiprev].node(), |
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136 rtiprev, |
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137 closednodes=closed) |
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138 |
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139 # Try to stick it as low as possible |
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140 # filter above served are unlikely to be fetch from a clone |
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141 for candidate in ('base', 'immutable', 'served'): |
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142 rview = repo.filtered(candidate) |
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143 if cache.validfor(rview): |
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144 repo._branchcaches[candidate] = cache |
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145 cache.write(rview) |
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146 break |
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147 |
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148 class branchcache(dict): |
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149 """A dict like object that hold branches heads cache. |
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150 |
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151 This cache is used to avoid costly computations to determine all the |
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152 branch heads of a repo. |
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153 |
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154 The cache is serialized on disk in the following format: |
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155 |
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156 <tip hex node> <tip rev number> [optional filtered repo hex hash] |
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157 <branch head hex node> <open/closed state> <branch name> |
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158 <branch head hex node> <open/closed state> <branch name> |
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159 ... |
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160 |
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161 The first line is used to check if the cache is still valid. If the |
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162 branch cache is for a filtered repo view, an optional third hash is |
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163 included that hashes the hashes of all filtered revisions. |
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164 |
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165 The open/closed state is represented by a single letter 'o' or 'c'. |
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166 This field can be used to avoid changelog reads when determining if a |
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167 branch head closes a branch or not. |
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168 """ |
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169 |
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170 def __init__(self, entries=(), tipnode=nullid, tiprev=nullrev, |
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171 filteredhash=None, closednodes=None): |
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172 super(branchcache, self).__init__(entries) |
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173 self.tipnode = tipnode |
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174 self.tiprev = tiprev |
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175 self.filteredhash = filteredhash |
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176 # closednodes is a set of nodes that close their branch. If the branch |
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177 # cache has been updated, it may contain nodes that are no longer |
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178 # heads. |
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179 if closednodes is None: |
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180 self._closednodes = set() |
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181 else: |
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182 self._closednodes = closednodes |
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183 |
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184 def validfor(self, repo): |
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185 """Is the cache content valid regarding a repo |
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186 |
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187 - False when cached tipnode is unknown or if we detect a strip. |
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188 - True when cache is up to date or a subset of current repo.""" |
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189 try: |
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190 return ((self.tipnode == repo.changelog.node(self.tiprev)) |
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191 and (self.filteredhash == \ |
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192 scmutil.filteredhash(repo, self.tiprev))) |
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193 except IndexError: |
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194 return False |
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195 |
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196 def _branchtip(self, heads): |
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197 '''Return tuple with last open head in heads and false, |
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198 otherwise return last closed head and true.''' |
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199 tip = heads[-1] |
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200 closed = True |
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201 for h in reversed(heads): |
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202 if h not in self._closednodes: |
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203 tip = h |
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204 closed = False |
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205 break |
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206 return tip, closed |
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207 |
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208 def branchtip(self, branch): |
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209 '''Return the tipmost open head on branch head, otherwise return the |
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210 tipmost closed head on branch. |
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211 Raise KeyError for unknown branch.''' |
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212 return self._branchtip(self[branch])[0] |
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213 |
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214 def branchheads(self, branch, closed=False): |
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215 heads = self[branch] |
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216 if not closed: |
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217 heads = [h for h in heads if h not in self._closednodes] |
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218 return heads |
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219 |
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220 def iterbranches(self): |
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221 for bn, heads in self.iteritems(): |
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222 yield (bn, heads) + self._branchtip(heads) |
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223 |
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224 def copy(self): |
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225 """return an deep copy of the branchcache object""" |
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226 return branchcache(self, self.tipnode, self.tiprev, self.filteredhash, |
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227 self._closednodes) |
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228 |
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229 def write(self, repo): |
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230 try: |
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231 f = repo.cachevfs(_filename(repo), "w", atomictemp=True) |
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232 cachekey = [hex(self.tipnode), '%d' % self.tiprev] |
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233 if self.filteredhash is not None: |
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234 cachekey.append(hex(self.filteredhash)) |
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235 f.write(" ".join(cachekey) + '\n') |
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236 nodecount = 0 |
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237 for label, nodes in sorted(self.iteritems()): |
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238 for node in nodes: |
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239 nodecount += 1 |
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240 if node in self._closednodes: |
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241 state = 'c' |
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242 else: |
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243 state = 'o' |
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244 f.write("%s %s %s\n" % (hex(node), state, |
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245 encoding.fromlocal(label))) |
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246 f.close() |
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247 repo.ui.log('branchcache', |
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248 'wrote %s branch cache with %d labels and %d nodes\n', |
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249 repo.filtername, len(self), nodecount) |
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250 except (IOError, OSError, error.Abort) as inst: |
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251 repo.ui.debug("couldn't write branch cache: %s\n" % inst) |
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252 # Abort may be raise by read only opener |
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253 pass |
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254 |
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255 def update(self, repo, revgen): |
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256 """Given a branchhead cache, self, that may have extra nodes or be |
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257 missing heads, and a generator of nodes that are strictly a superset of |
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258 heads missing, this function updates self to be correct. |
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259 """ |
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260 starttime = util.timer() |
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261 cl = repo.changelog |
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262 # collect new branch entries |
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263 newbranches = {} |
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264 getbranchinfo = repo.revbranchcache().branchinfo |
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265 for r in revgen: |
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266 branch, closesbranch = getbranchinfo(r) |
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267 newbranches.setdefault(branch, []).append(r) |
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268 if closesbranch: |
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269 self._closednodes.add(cl.node(r)) |
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270 |
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271 # fetch current topological heads to speed up filtering |
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272 topoheads = set(cl.headrevs()) |
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273 |
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274 # if older branchheads are reachable from new ones, they aren't |
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275 # really branchheads. Note checking parents is insufficient: |
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276 # 1 (branch a) -> 2 (branch b) -> 3 (branch a) |
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277 for branch, newheadrevs in newbranches.iteritems(): |
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278 bheads = self.setdefault(branch, []) |
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279 bheadset = set(cl.rev(node) for node in bheads) |
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280 |
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281 # This have been tested True on all internal usage of this function. |
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282 # run it again in case of doubt |
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283 # assert not (set(bheadrevs) & set(newheadrevs)) |
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284 newheadrevs.sort() |
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285 bheadset.update(newheadrevs) |
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286 |
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287 # This prunes out two kinds of heads - heads that are superseded by |
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288 # a head in newheadrevs, and newheadrevs that are not heads because |
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289 # an existing head is their descendant. |
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290 uncertain = bheadset - topoheads |
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291 if uncertain: |
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292 floorrev = min(uncertain) |
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293 ancestors = set(cl.ancestors(newheadrevs, floorrev)) |
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294 bheadset -= ancestors |
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295 bheadrevs = sorted(bheadset) |
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296 self[branch] = [cl.node(rev) for rev in bheadrevs] |
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297 tiprev = bheadrevs[-1] |
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298 if tiprev > self.tiprev: |
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299 self.tipnode = cl.node(tiprev) |
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300 self.tiprev = tiprev |
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301 |
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302 if not self.validfor(repo): |
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303 # cache key are not valid anymore |
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304 self.tipnode = nullid |
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305 self.tiprev = nullrev |
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306 for heads in self.values(): |
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307 tiprev = max(cl.rev(node) for node in heads) |
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308 if tiprev > self.tiprev: |
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309 self.tipnode = cl.node(tiprev) |
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310 self.tiprev = tiprev |
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311 self.filteredhash = scmutil.filteredhash(repo, self.tiprev) |
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312 |
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313 duration = util.timer() - starttime |
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314 repo.ui.log('branchcache', 'updated %s branch cache in %.4f seconds\n', |
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315 repo.filtername, duration) |
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316 |
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317 # Revision branch info cache |
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318 |
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319 _rbcversion = '-v1' |
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320 _rbcnames = 'rbc-names' + _rbcversion |
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321 _rbcrevs = 'rbc-revs' + _rbcversion |
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322 # [4 byte hash prefix][4 byte branch name number with sign bit indicating open] |
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323 _rbcrecfmt = '>4sI' |
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324 _rbcrecsize = calcsize(_rbcrecfmt) |
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325 _rbcnodelen = 4 |
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326 _rbcbranchidxmask = 0x7fffffff |
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327 _rbccloseflag = 0x80000000 |
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328 |
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329 class revbranchcache(object): |
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330 """Persistent cache, mapping from revision number to branch name and close. |
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331 This is a low level cache, independent of filtering. |
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332 |
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333 Branch names are stored in rbc-names in internal encoding separated by 0. |
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334 rbc-names is append-only, and each branch name is only stored once and will |
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335 thus have a unique index. |
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336 |
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337 The branch info for each revision is stored in rbc-revs as constant size |
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338 records. The whole file is read into memory, but it is only 'parsed' on |
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339 demand. The file is usually append-only but will be truncated if repo |
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340 modification is detected. |
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341 The record for each revision contains the first 4 bytes of the |
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342 corresponding node hash, and the record is only used if it still matches. |
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343 Even a completely trashed rbc-revs fill thus still give the right result |
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344 while converging towards full recovery ... assuming no incorrectly matching |
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345 node hashes. |
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346 The record also contains 4 bytes where 31 bits contains the index of the |
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347 branch and the last bit indicate that it is a branch close commit. |
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348 The usage pattern for rbc-revs is thus somewhat similar to 00changelog.i |
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349 and will grow with it but be 1/8th of its size. |
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350 """ |
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351 |
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352 def __init__(self, repo, readonly=True): |
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353 assert repo.filtername is None |
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354 self._repo = repo |
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355 self._names = [] # branch names in local encoding with static index |
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356 self._rbcrevs = bytearray() |
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357 self._rbcsnameslen = 0 # length of names read at _rbcsnameslen |
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358 try: |
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359 bndata = repo.cachevfs.read(_rbcnames) |
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360 self._rbcsnameslen = len(bndata) # for verification before writing |
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361 if bndata: |
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362 self._names = [encoding.tolocal(bn) |
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363 for bn in bndata.split('\0')] |
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364 except (IOError, OSError): |
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365 if readonly: |
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366 # don't try to use cache - fall back to the slow path |
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367 self.branchinfo = self._branchinfo |
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368 |
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369 if self._names: |
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370 try: |
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371 data = repo.cachevfs.read(_rbcrevs) |
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372 self._rbcrevs[:] = data |
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373 except (IOError, OSError) as inst: |
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374 repo.ui.debug("couldn't read revision branch cache: %s\n" % |
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375 inst) |
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376 # remember number of good records on disk |
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377 self._rbcrevslen = min(len(self._rbcrevs) // _rbcrecsize, |
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378 len(repo.changelog)) |
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379 if self._rbcrevslen == 0: |
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380 self._names = [] |
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381 self._rbcnamescount = len(self._names) # number of names read at |
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382 # _rbcsnameslen |
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383 self._namesreverse = dict((b, r) for r, b in enumerate(self._names)) |
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384 |
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385 def _clear(self): |
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386 self._rbcsnameslen = 0 |
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387 del self._names[:] |
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388 self._rbcnamescount = 0 |
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389 self._namesreverse.clear() |
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390 self._rbcrevslen = len(self._repo.changelog) |
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391 self._rbcrevs = bytearray(self._rbcrevslen * _rbcrecsize) |
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392 |
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393 def branchinfo(self, rev): |
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394 """Return branch name and close flag for rev, using and updating |
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395 persistent cache.""" |
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396 changelog = self._repo.changelog |
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397 rbcrevidx = rev * _rbcrecsize |
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398 |
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399 # avoid negative index, changelog.read(nullrev) is fast without cache |
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400 if rev == nullrev: |
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401 return changelog.branchinfo(rev) |
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402 |
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403 # if requested rev isn't allocated, grow and cache the rev info |
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404 if len(self._rbcrevs) < rbcrevidx + _rbcrecsize: |
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405 return self._branchinfo(rev) |
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406 |
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407 # fast path: extract data from cache, use it if node is matching |
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408 reponode = changelog.node(rev)[:_rbcnodelen] |
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409 cachenode, branchidx = unpack_from(_rbcrecfmt, self._rbcrevs, rbcrevidx) |
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410 close = bool(branchidx & _rbccloseflag) |
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411 if close: |
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412 branchidx &= _rbcbranchidxmask |
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413 if cachenode == '\0\0\0\0': |
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414 pass |
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415 elif cachenode == reponode: |
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416 try: |
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417 return self._names[branchidx], close |
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418 except IndexError: |
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419 # recover from invalid reference to unknown branch |
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420 self._repo.ui.debug("referenced branch names not found" |
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421 " - rebuilding revision branch cache from scratch\n") |
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422 self._clear() |
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423 else: |
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424 # rev/node map has changed, invalidate the cache from here up |
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425 self._repo.ui.debug("history modification detected - truncating " |
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426 "revision branch cache to revision %d\n" % rev) |
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427 truncate = rbcrevidx + _rbcrecsize |
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428 del self._rbcrevs[truncate:] |
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429 self._rbcrevslen = min(self._rbcrevslen, truncate) |
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430 |
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431 # fall back to slow path and make sure it will be written to disk |
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432 return self._branchinfo(rev) |
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433 |
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434 def _branchinfo(self, rev): |
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435 """Retrieve branch info from changelog and update _rbcrevs""" |
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436 changelog = self._repo.changelog |
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437 b, close = changelog.branchinfo(rev) |
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438 if b in self._namesreverse: |
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439 branchidx = self._namesreverse[b] |
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440 else: |
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441 branchidx = len(self._names) |
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442 self._names.append(b) |
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443 self._namesreverse[b] = branchidx |
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444 reponode = changelog.node(rev) |
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445 if close: |
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446 branchidx |= _rbccloseflag |
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447 self._setcachedata(rev, reponode, branchidx) |
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448 return b, close |
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449 |
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450 def _setcachedata(self, rev, node, branchidx): |
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451 """Writes the node's branch data to the in-memory cache data.""" |
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452 if rev == nullrev: |
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453 return |
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454 rbcrevidx = rev * _rbcrecsize |
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455 if len(self._rbcrevs) < rbcrevidx + _rbcrecsize: |
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456 self._rbcrevs.extend('\0' * |
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457 (len(self._repo.changelog) * _rbcrecsize - |
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458 len(self._rbcrevs))) |
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459 pack_into(_rbcrecfmt, self._rbcrevs, rbcrevidx, node, branchidx) |
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460 self._rbcrevslen = min(self._rbcrevslen, rev) |
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461 |
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462 tr = self._repo.currenttransaction() |
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463 if tr: |
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464 tr.addfinalize('write-revbranchcache', self.write) |
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465 |
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466 def write(self, tr=None): |
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467 """Save branch cache if it is dirty.""" |
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468 repo = self._repo |
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469 wlock = None |
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470 step = '' |
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471 try: |
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472 if self._rbcnamescount < len(self._names): |
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473 step = ' names' |
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474 wlock = repo.wlock(wait=False) |
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475 if self._rbcnamescount != 0: |
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476 f = repo.cachevfs.open(_rbcnames, 'ab') |
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477 if f.tell() == self._rbcsnameslen: |
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478 f.write('\0') |
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479 else: |
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480 f.close() |
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481 repo.ui.debug("%s changed - rewriting it\n" % _rbcnames) |
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482 self._rbcnamescount = 0 |
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483 self._rbcrevslen = 0 |
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484 if self._rbcnamescount == 0: |
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485 # before rewriting names, make sure references are removed |
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486 repo.cachevfs.unlinkpath(_rbcrevs, ignoremissing=True) |
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487 f = repo.cachevfs.open(_rbcnames, 'wb') |
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488 f.write('\0'.join(encoding.fromlocal(b) |
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489 for b in self._names[self._rbcnamescount:])) |
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490 self._rbcsnameslen = f.tell() |
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491 f.close() |
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492 self._rbcnamescount = len(self._names) |
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493 |
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494 start = self._rbcrevslen * _rbcrecsize |
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495 if start != len(self._rbcrevs): |
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496 step = '' |
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497 if wlock is None: |
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498 wlock = repo.wlock(wait=False) |
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499 revs = min(len(repo.changelog), |
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500 len(self._rbcrevs) // _rbcrecsize) |
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501 f = repo.cachevfs.open(_rbcrevs, 'ab') |
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502 if f.tell() != start: |
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503 repo.ui.debug("truncating cache/%s to %d\n" |
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504 % (_rbcrevs, start)) |
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505 f.seek(start) |
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506 if f.tell() != start: |
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507 start = 0 |
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508 f.seek(start) |
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509 f.truncate() |
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510 end = revs * _rbcrecsize |
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511 f.write(self._rbcrevs[start:end]) |
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512 f.close() |
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513 self._rbcrevslen = revs |
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514 except (IOError, OSError, error.Abort, error.LockError) as inst: |
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515 repo.ui.debug("couldn't write revision branch cache%s: %s\n" |
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516 % (step, inst)) |
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517 finally: |
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518 if wlock is not None: |
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519 wlock.release() |