Mercurial > hg
annotate mercurial/filelog.py @ 39559:07b58266bce3
wireprotov2: implement commands as a generator of objects
Previously, wire protocol version 2 inherited version 1's model of
having separate types to represent the results of different wire
protocol commands.
As I implemented more powerful commands in future commits, I found
I was using a common pattern of returning a special type to hold a
generator. This meant the command function required a closure to
do most of the work. That made logic flow more difficult to follow.
I also noticed that many commands were effectively a sequence of
objects to be CBOR encoded.
I think it makes sense to define version 2 commands as generators.
This way, commands can simply emit the data structures they wish to
send to the client. This eliminates the need for a closure in
command functions and removes encoding from the bodies of commands.
As part of this commit, the handling of response objects has been
moved into the serverreactor class. This puts the reactor in the
driver's seat with regards to CBOR encoding and error handling.
Having error handling in the function that emits frames is
particularly important because exceptions in that function can lead
to things getting in a bad state: I'm fairly certain that uncaught
exceptions in the frame generator were causing deadlocks.
I also introduced a dedicated error type for explicit error reporting
in command handlers. This will be used in subsequent commits.
There's still a bit of work to be done here, especially around
formalizing the error handling "protocol." I've added yet another
TODO to track this so we don't forget.
Test output changed because we're using generators and no longer know
we are at the end of the data until we hit the end of the generator.
This means we can't emit the end-of-stream flag until we've exhausted
the generator. Hence the introduction of 0-sized end-of-stream frames.
Differential Revision: https://phab.mercurial-scm.org/D4472
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Wed, 05 Sep 2018 09:06:40 -0700 |
parents | 71575a1e197e |
children | 3e801ffd7269 |
rev | line source |
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1089 | 1 # filelog.py - file history class for mercurial |
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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 |
10263 | 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 . import ( |
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11 error, |
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12 repository, |
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13 revlog, |
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14 ) |
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15 from .utils import ( |
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16 interfaceutil, |
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17 ) |
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18 |
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19 @interfaceutil.implementer(repository.ifilestorage) |
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20 class filelog(object): |
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21 def __init__(self, opener, path): |
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22 self._revlog = revlog.revlog(opener, |
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23 '/'.join(('data', path + '.i')), |
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24 censorable=True) |
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25 # full name of the user visible file, relative to the repository root |
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26 self.filename = path |
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27 self.index = self._revlog.index |
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28 self.version = self._revlog.version |
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29 self._generaldelta = self._revlog._generaldelta |
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30 |
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31 def __len__(self): |
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32 return len(self._revlog) |
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33 |
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34 def __iter__(self): |
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35 return self._revlog.__iter__() |
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36 |
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37 def revs(self, start=0, stop=None): |
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38 return self._revlog.revs(start=start, stop=stop) |
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39 |
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40 def parents(self, node): |
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41 return self._revlog.parents(node) |
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42 |
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43 def parentrevs(self, rev): |
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44 return self._revlog.parentrevs(rev) |
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45 |
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46 def rev(self, node): |
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47 return self._revlog.rev(node) |
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48 |
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49 def node(self, rev): |
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50 return self._revlog.node(rev) |
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51 |
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52 def lookup(self, node): |
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53 return self._revlog.lookup(node) |
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54 |
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55 def linkrev(self, rev): |
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56 return self._revlog.linkrev(rev) |
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57 |
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58 def flags(self, rev): |
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59 return self._revlog.flags(rev) |
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60 |
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61 def commonancestorsheads(self, node1, node2): |
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62 return self._revlog.commonancestorsheads(node1, node2) |
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63 |
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64 def descendants(self, revs): |
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65 return self._revlog.descendants(revs) |
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66 |
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67 def headrevs(self): |
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68 return self._revlog.headrevs() |
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69 |
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70 def heads(self, start=None, stop=None): |
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71 return self._revlog.heads(start, stop) |
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72 |
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73 def children(self, node): |
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74 return self._revlog.children(node) |
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75 |
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76 def deltaparent(self, rev): |
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77 return self._revlog.deltaparent(rev) |
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78 |
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79 def iscensored(self, rev): |
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80 return self._revlog.iscensored(rev) |
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81 |
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82 def rawsize(self, rev): |
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83 return self._revlog.rawsize(rev) |
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84 |
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85 def checkhash(self, text, node, p1=None, p2=None, rev=None): |
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86 return self._revlog.checkhash(text, node, p1=p1, p2=p2, rev=rev) |
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87 |
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88 def revision(self, node, _df=None, raw=False): |
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89 return self._revlog.revision(node, _df=_df, raw=raw) |
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90 |
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91 def revdiff(self, rev1, rev2): |
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92 return self._revlog.revdiff(rev1, rev2) |
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93 |
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94 def emitrevisiondeltas(self, requests): |
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95 return self._revlog.emitrevisiondeltas(requests) |
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96 |
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97 def addrevision(self, revisiondata, transaction, linkrev, p1, p2, |
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98 node=None, flags=revlog.REVIDX_DEFAULT_FLAGS, |
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99 cachedelta=None): |
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100 return self._revlog.addrevision(revisiondata, transaction, linkrev, |
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101 p1, p2, node=node, flags=flags, |
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102 cachedelta=cachedelta) |
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103 |
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104 def addgroup(self, deltas, linkmapper, transaction, addrevisioncb=None): |
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105 return self._revlog.addgroup(deltas, linkmapper, transaction, |
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106 addrevisioncb=addrevisioncb) |
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107 |
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108 def getstrippoint(self, minlink): |
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109 return self._revlog.getstrippoint(minlink) |
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110 |
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111 def strip(self, minlink, transaction): |
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112 return self._revlog.strip(minlink, transaction) |
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113 |
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114 def files(self): |
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115 return self._revlog.files() |
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116 |
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117 def checksize(self): |
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118 return self._revlog.checksize() |
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119 |
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120 def read(self, node): |
360 | 121 t = self.revision(node) |
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122 if not t.startswith('\1\n'): |
360 | 123 return t |
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124 s = t.index('\1\n', 2) |
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125 return t[s + 2:] |
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127 def add(self, text, meta, transaction, link, p1=None, p2=None): | |
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128 if meta or text.startswith('\1\n'): |
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129 text = revlog.packmeta(meta, text) |
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130 return self.addrevision(text, transaction, link, p1, p2) |
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131 |
1116 | 132 def renamed(self, node): |
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133 if self.parents(node)[0] != revlog.nullid: |
1116 | 134 return False |
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135 t = self.revision(node) |
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136 m = revlog.parsemeta(t)[0] |
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137 # copy and copyrev occur in pairs. In rare cases due to bugs, |
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138 # one can occur without the other. |
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139 if m and "copy" in m and "copyrev" in m: |
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140 return (m["copy"], revlog.bin(m["copyrev"])) |
1116 | 141 return False |
142 | |
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143 def size(self, rev): |
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144 """return the size of a given revision""" |
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145 |
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146 # for revisions with renames, we have to go the slow way |
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147 node = self.node(rev) |
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148 if self.renamed(node): |
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149 return len(self.read(node)) |
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150 if self.iscensored(rev): |
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151 return 0 |
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152 |
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153 # XXX if self.read(node).startswith("\1\n"), this returns (size+4) |
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154 return self._revlog.size(rev) |
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155 |
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156 def cmp(self, node, text): |
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157 """compare text with a given file revision |
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158 |
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159 returns True if text is different than what is stored. |
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160 """ |
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161 |
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162 t = text |
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163 if text.startswith('\1\n'): |
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164 t = '\1\n\1\n' + text |
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165 |
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166 samehashes = not self._revlog.cmp(node, t) |
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167 if samehashes: |
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168 return False |
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169 |
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170 # censored files compare against the empty file |
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171 if self.iscensored(self.rev(node)): |
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172 return text != '' |
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173 |
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174 # renaming a file produces a different hash, even if the data |
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175 # remains unchanged. Check if it's the case (slow): |
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176 if self.renamed(node): |
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177 t2 = self.read(node) |
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178 return t2 != text |
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179 |
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180 return True |
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181 |
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182 @property |
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183 def filename(self): |
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184 return self._revlog.filename |
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185 |
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186 @filename.setter |
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187 def filename(self, value): |
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188 self._revlog.filename = value |
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189 |
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190 # TODO these aren't part of the interface and aren't internal methods. |
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191 # Callers should be fixed to not use them. |
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192 @property |
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193 def indexfile(self): |
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194 return self._revlog.indexfile |
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195 |
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196 @indexfile.setter |
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197 def indexfile(self, value): |
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198 self._revlog.indexfile = value |
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199 |
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200 @property |
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201 def datafile(self): |
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202 return self._revlog.datafile |
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203 |
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204 @property |
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205 def opener(self): |
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206 return self._revlog.opener |
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207 |
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208 def clone(self, tr, destrevlog, **kwargs): |
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209 if not isinstance(destrevlog, filelog): |
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210 raise error.ProgrammingError('expected filelog to clone()') |
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211 |
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212 return self._revlog.clone(tr, destrevlog._revlog, **kwargs) |
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213 |
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214 def start(self, rev): |
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215 return self._revlog.start(rev) |
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216 |
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217 def end(self, rev): |
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218 return self._revlog.end(rev) |
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219 |
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220 def length(self, rev): |
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221 return self._revlog.length(rev) |
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222 |
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223 def compress(self, data): |
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224 return self._revlog.compress(data) |
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225 |
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226 def _addrevision(self, *args, **kwargs): |
1541e1a8e87d
filelog: wrap revlog instead of inheriting it (API)
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37443
diff
changeset
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227 return self._revlog._addrevision(*args, **kwargs) |