Mercurial > hg
annotate mercurial/wireprotov1peer.py @ 48713:5dfaca4464d1
merge-actions: add an explicite "no_op" attribute
This make the MergeAction smarter and able to describe themself. This is useful
to help introducing more MergeAction object that better the complexity of the
situation.
Differential Revision: https://phab.mercurial-scm.org/D12116
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Fri, 28 Jan 2022 15:19:58 +0100 |
parents | c424ff4807e6 |
children | a0da5075bca3 |
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1 # wireprotov1peer.py - Client-side functionality for wire protocol version 1. |
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2 # |
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3 # Copyright 2005-2010 Olivia Mackall <olivia@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 sys |
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11 import weakref |
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12 |
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13 from .i18n import _ |
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14 from .node import bin |
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15 from .pycompat import ( |
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16 getattr, |
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17 setattr, |
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18 ) |
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19 from . import ( |
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20 bundle2, |
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21 changegroup as changegroupmod, |
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22 encoding, |
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23 error, |
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24 pushkey as pushkeymod, |
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25 pycompat, |
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26 util, |
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27 wireprototypes, |
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28 ) |
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29 from .interfaces import ( |
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30 repository, |
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31 util as interfaceutil, |
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32 ) |
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33 from .utils import hashutil |
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34 |
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35 urlreq = util.urlreq |
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36 |
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37 |
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38 def batchable(f): |
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39 """annotation for batchable methods |
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40 |
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41 Such methods must implement a coroutine as follows: |
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42 |
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43 @batchable |
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44 def sample(self, one, two=None): |
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45 # Build list of encoded arguments suitable for your wire protocol: |
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46 encoded_args = [('one', encode(one),), ('two', encode(two),)] |
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47 # Return it, along with a function that will receive the result |
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48 # from the batched request. |
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49 return encoded_args, decode |
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50 |
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51 The decorator returns a function which wraps this coroutine as a plain |
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52 method, but adds the original method as an attribute called "batchable", |
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53 which is used by remotebatch to split the call into separate encoding and |
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54 decoding phases. |
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55 """ |
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56 |
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57 def plain(*args, **opts): |
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58 encoded_args_or_res, decode = f(*args, **opts) |
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59 if not decode: |
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60 return encoded_args_or_res # a local result in this case |
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61 self = args[0] |
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62 cmd = pycompat.bytesurl(f.__name__) # ensure cmd is ascii bytestr |
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63 encoded_res = self._submitone(cmd, encoded_args_or_res) |
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64 return decode(encoded_res) |
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65 |
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66 setattr(plain, 'batchable', f) |
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67 setattr(plain, '__name__', f.__name__) |
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68 return plain |
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69 |
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70 |
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71 def encodebatchcmds(req): |
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72 """Return a ``cmds`` argument value for the ``batch`` command.""" |
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73 escapearg = wireprototypes.escapebatcharg |
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74 |
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75 cmds = [] |
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76 for op, argsdict in req: |
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77 # Old servers didn't properly unescape argument names. So prevent |
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78 # the sending of argument names that may not be decoded properly by |
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79 # servers. |
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80 assert all(escapearg(k) == k for k in argsdict) |
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81 |
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82 args = b','.join( |
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83 b'%s=%s' % (escapearg(k), escapearg(v)) |
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84 for k, v in pycompat.iteritems(argsdict) |
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85 ) |
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86 cmds.append(b'%s %s' % (op, args)) |
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87 |
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88 return b';'.join(cmds) |
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89 |
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90 |
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91 class unsentfuture(pycompat.futures.Future): |
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92 """A Future variation to represent an unsent command. |
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93 |
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94 Because we buffer commands and don't submit them immediately, calling |
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95 ``result()`` on an unsent future could deadlock. Futures for buffered |
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96 commands are represented by this type, which wraps ``result()`` to |
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97 call ``sendcommands()``. |
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98 """ |
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99 |
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100 def result(self, timeout=None): |
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101 if self.done(): |
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102 return pycompat.futures.Future.result(self, timeout) |
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103 |
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104 self._peerexecutor.sendcommands() |
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105 |
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106 # This looks like it will infinitely recurse. However, |
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107 # sendcommands() should modify __class__. This call serves as a check |
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108 # on that. |
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109 return self.result(timeout) |
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110 |
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111 |
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112 @interfaceutil.implementer(repository.ipeercommandexecutor) |
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113 class peerexecutor(object): |
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114 def __init__(self, peer): |
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115 self._peer = peer |
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116 self._sent = False |
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117 self._closed = False |
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118 self._calls = [] |
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119 self._futures = weakref.WeakSet() |
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120 self._responseexecutor = None |
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121 self._responsef = None |
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122 |
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123 def __enter__(self): |
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124 return self |
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125 |
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126 def __exit__(self, exctype, excvalee, exctb): |
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127 self.close() |
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128 |
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129 def callcommand(self, command, args): |
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130 if self._sent: |
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131 raise error.ProgrammingError( |
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132 b'callcommand() cannot be used after commands are sent' |
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133 ) |
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134 |
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135 if self._closed: |
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136 raise error.ProgrammingError( |
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137 b'callcommand() cannot be used after close()' |
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138 ) |
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139 |
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140 # Commands are dispatched through methods on the peer. |
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141 fn = getattr(self._peer, pycompat.sysstr(command), None) |
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142 |
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143 if not fn: |
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144 raise error.ProgrammingError( |
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145 b'cannot call command %s: method of same name not available ' |
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146 b'on peer' % command |
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147 ) |
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148 |
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149 # Commands are either batchable or they aren't. If a command |
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150 # isn't batchable, we send it immediately because the executor |
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151 # can no longer accept new commands after a non-batchable command. |
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152 # If a command is batchable, we queue it for later. But we have |
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153 # to account for the case of a non-batchable command arriving after |
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154 # a batchable one and refuse to service it. |
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155 |
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156 def addcall(): |
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157 f = pycompat.futures.Future() |
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158 self._futures.add(f) |
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159 self._calls.append((command, args, fn, f)) |
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160 return f |
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161 |
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162 if getattr(fn, 'batchable', False): |
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163 f = addcall() |
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164 |
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165 # But since we don't issue it immediately, we wrap its result() |
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166 # to trigger sending so we avoid deadlocks. |
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167 f.__class__ = unsentfuture |
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168 f._peerexecutor = self |
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169 else: |
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170 if self._calls: |
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171 raise error.ProgrammingError( |
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172 b'%s is not batchable and cannot be called on a command ' |
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173 b'executor along with other commands' % command |
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174 ) |
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175 |
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176 f = addcall() |
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177 |
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178 # Non-batchable commands can never coexist with another command |
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179 # in this executor. So send the command immediately. |
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180 self.sendcommands() |
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181 |
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182 return f |
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183 |
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184 def sendcommands(self): |
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185 if self._sent: |
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186 return |
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187 |
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188 if not self._calls: |
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189 return |
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190 |
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191 self._sent = True |
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192 |
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193 # Unhack any future types so caller seens a clean type and to break |
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194 # cycle between us and futures. |
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195 for f in self._futures: |
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196 if isinstance(f, unsentfuture): |
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197 f.__class__ = pycompat.futures.Future |
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198 f._peerexecutor = None |
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199 |
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200 calls = self._calls |
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201 # Mainly to destroy references to futures. |
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202 self._calls = None |
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203 |
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204 # Simple case of a single command. We call it synchronously. |
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205 if len(calls) == 1: |
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206 command, args, fn, f = calls[0] |
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207 |
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208 # Future was cancelled. Ignore it. |
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209 if not f.set_running_or_notify_cancel(): |
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210 return |
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211 |
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212 try: |
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213 result = fn(**pycompat.strkwargs(args)) |
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214 except Exception: |
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215 pycompat.future_set_exception_info(f, sys.exc_info()[1:]) |
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216 else: |
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217 f.set_result(result) |
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218 |
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219 return |
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220 |
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221 # Batch commands are a bit harder. First, we have to deal with the |
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222 # @batchable coroutine. That's a bit annoying. Furthermore, we also |
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223 # need to preserve streaming. i.e. it should be possible for the |
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224 # futures to resolve as data is coming in off the wire without having |
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225 # to wait for the final byte of the final response. We do this by |
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226 # spinning up a thread to read the responses. |
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227 |
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228 requests = [] |
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229 states = [] |
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230 |
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231 for command, args, fn, f in calls: |
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232 # Future was cancelled. Ignore it. |
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233 if not f.set_running_or_notify_cancel(): |
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234 continue |
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235 |
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236 try: |
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237 encoded_args_or_res, decode = fn.batchable( |
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238 fn.__self__, **pycompat.strkwargs(args) |
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239 ) |
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240 except Exception: |
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241 pycompat.future_set_exception_info(f, sys.exc_info()[1:]) |
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242 return |
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243 |
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244 if not decode: |
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245 f.set_result(encoded_args_or_res) |
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246 else: |
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247 requests.append((command, encoded_args_or_res)) |
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248 states.append((command, f, batchable, decode)) |
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249 |
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250 if not requests: |
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251 return |
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252 |
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253 # This will emit responses in order they were executed. |
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254 wireresults = self._peer._submitbatch(requests) |
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255 |
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256 # The use of a thread pool executor here is a bit weird for something |
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257 # that only spins up a single thread. However, thread management is |
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258 # hard and it is easy to encounter race conditions, deadlocks, etc. |
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259 # concurrent.futures already solves these problems and its thread pool |
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260 # executor has minimal overhead. So we use it. |
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261 self._responseexecutor = pycompat.futures.ThreadPoolExecutor(1) |
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262 self._responsef = self._responseexecutor.submit( |
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263 self._readbatchresponse, states, wireresults |
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264 ) |
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265 |
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266 def close(self): |
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267 self.sendcommands() |
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268 |
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269 if self._closed: |
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270 return |
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271 |
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272 self._closed = True |
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273 |
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274 if not self._responsef: |
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275 return |
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276 |
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277 # We need to wait on our in-flight response and then shut down the |
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278 # executor once we have a result. |
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279 try: |
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280 self._responsef.result() |
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281 finally: |
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282 self._responseexecutor.shutdown(wait=True) |
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283 self._responsef = None |
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284 self._responseexecutor = None |
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285 |
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286 # If any of our futures are still in progress, mark them as |
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287 # errored. Otherwise a result() could wait indefinitely. |
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288 for f in self._futures: |
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289 if not f.done(): |
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290 f.set_exception( |
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291 error.ResponseError( |
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292 _(b'unfulfilled batch command response'), None |
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293 ) |
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294 ) |
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295 |
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296 self._futures = None |
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297 |
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298 def _readbatchresponse(self, states, wireresults): |
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299 # Executes in a thread to read data off the wire. |
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300 |
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301 for command, f, batchable, decode in states: |
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302 # Grab raw result off the wire and teach the internal future |
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303 # about it. |
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304 try: |
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305 remoteresult = next(wireresults) |
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306 except StopIteration: |
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307 # This can happen in particular because next(batchable) |
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308 # in the previous iteration can call peer._abort, which |
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309 # may close the peer. |
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310 f.set_exception( |
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311 error.ResponseError( |
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312 _(b'unfulfilled batch command response'), None |
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313 ) |
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314 ) |
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315 else: |
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316 try: |
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317 result = decode(remoteresult) |
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318 except Exception: |
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319 pycompat.future_set_exception_info(f, sys.exc_info()[1:]) |
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320 else: |
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321 f.set_result(result) |
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322 |
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323 |
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324 @interfaceutil.implementer( |
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325 repository.ipeercommands, repository.ipeerlegacycommands |
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326 ) |
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327 class wirepeer(repository.peer): |
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328 """Client-side interface for communicating with a peer repository. |
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329 |
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330 Methods commonly call wire protocol commands of the same name. |
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331 |
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332 See also httppeer.py and sshpeer.py for protocol-specific |
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333 implementations of this interface. |
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334 """ |
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335 |
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336 def commandexecutor(self): |
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337 return peerexecutor(self) |
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338 |
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339 # Begin of ipeercommands interface. |
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340 |
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341 def clonebundles(self): |
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342 self.requirecap(b'clonebundles', _(b'clone bundles')) |
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343 return self._call(b'clonebundles') |
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344 |
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345 @batchable |
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346 def lookup(self, key): |
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347 self.requirecap(b'lookup', _(b'look up remote revision')) |
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348 |
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349 def decode(d): |
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350 success, data = d[:-1].split(b" ", 1) |
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351 if int(success): |
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352 return bin(data) |
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353 else: |
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354 self._abort(error.RepoError(data)) |
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355 |
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356 return {b'key': encoding.fromlocal(key)}, decode |
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357 |
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358 @batchable |
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359 def heads(self): |
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360 def decode(d): |
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361 try: |
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362 return wireprototypes.decodelist(d[:-1]) |
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363 except ValueError: |
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364 self._abort(error.ResponseError(_(b"unexpected response:"), d)) |
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365 |
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366 return {}, decode |
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367 |
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368 @batchable |
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369 def known(self, nodes): |
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370 def decode(d): |
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371 try: |
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372 return [bool(int(b)) for b in pycompat.iterbytestr(d)] |
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373 except ValueError: |
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374 self._abort(error.ResponseError(_(b"unexpected response:"), d)) |
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375 |
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376 return {b'nodes': wireprototypes.encodelist(nodes)}, decode |
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377 |
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378 @batchable |
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379 def branchmap(self): |
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380 def decode(d): |
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381 try: |
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382 branchmap = {} |
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383 for branchpart in d.splitlines(): |
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384 branchname, branchheads = branchpart.split(b' ', 1) |
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385 branchname = encoding.tolocal(urlreq.unquote(branchname)) |
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386 branchheads = wireprototypes.decodelist(branchheads) |
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387 branchmap[branchname] = branchheads |
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388 return branchmap |
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389 except TypeError: |
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390 self._abort(error.ResponseError(_(b"unexpected response:"), d)) |
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391 |
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392 return {}, decode |
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393 |
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394 @batchable |
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395 def listkeys(self, namespace): |
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396 if not self.capable(b'pushkey'): |
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397 return {}, None |
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398 self.ui.debug(b'preparing listkeys for "%s"\n' % namespace) |
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399 |
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400 def decode(d): |
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401 self.ui.debug( |
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402 b'received listkey for "%s": %i bytes\n' % (namespace, len(d)) |
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403 ) |
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404 return pushkeymod.decodekeys(d) |
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405 |
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406 return {b'namespace': encoding.fromlocal(namespace)}, decode |
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407 |
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408 @batchable |
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409 def pushkey(self, namespace, key, old, new): |
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410 if not self.capable(b'pushkey'): |
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411 return False, None |
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412 self.ui.debug(b'preparing pushkey for "%s:%s"\n' % (namespace, key)) |
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413 |
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414 def decode(d): |
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415 d, output = d.split(b'\n', 1) |
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416 try: |
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417 d = bool(int(d)) |
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418 except ValueError: |
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419 raise error.ResponseError( |
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420 _(b'push failed (unexpected response):'), d |
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421 ) |
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422 for l in output.splitlines(True): |
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423 self.ui.status(_(b'remote: '), l) |
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424 return d |
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425 |
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426 return { |
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427 b'namespace': encoding.fromlocal(namespace), |
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428 b'key': encoding.fromlocal(key), |
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429 b'old': encoding.fromlocal(old), |
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430 b'new': encoding.fromlocal(new), |
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431 }, decode |
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432 |
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433 def stream_out(self): |
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434 return self._callstream(b'stream_out') |
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435 |
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436 def getbundle(self, source, **kwargs): |
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437 kwargs = pycompat.byteskwargs(kwargs) |
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438 self.requirecap(b'getbundle', _(b'look up remote changes')) |
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439 opts = {} |
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440 bundlecaps = kwargs.get(b'bundlecaps') or set() |
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441 for key, value in pycompat.iteritems(kwargs): |
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442 if value is None: |
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443 continue |
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444 keytype = wireprototypes.GETBUNDLE_ARGUMENTS.get(key) |
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445 if keytype is None: |
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446 raise error.ProgrammingError( |
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447 b'Unexpectedly None keytype for key %s' % key |
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448 ) |
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449 elif keytype == b'nodes': |
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450 value = wireprototypes.encodelist(value) |
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451 elif keytype == b'csv': |
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452 value = b','.join(value) |
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453 elif keytype == b'scsv': |
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454 value = b','.join(sorted(value)) |
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455 elif keytype == b'boolean': |
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456 value = b'%i' % bool(value) |
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457 elif keytype != b'plain': |
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458 raise KeyError(b'unknown getbundle option type %s' % keytype) |
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459 opts[key] = value |
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460 f = self._callcompressable(b"getbundle", **pycompat.strkwargs(opts)) |
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461 if any((cap.startswith(b'HG2') for cap in bundlecaps)): |
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462 return bundle2.getunbundler(self.ui, f) |
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463 else: |
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464 return changegroupmod.cg1unpacker(f, b'UN') |
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465 |
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466 def unbundle(self, bundle, heads, url): |
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467 """Send cg (a readable file-like object representing the |
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468 changegroup to push, typically a chunkbuffer object) to the |
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469 remote server as a bundle. |
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470 |
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471 When pushing a bundle10 stream, return an integer indicating the |
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472 result of the push (see changegroup.apply()). |
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473 |
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474 When pushing a bundle20 stream, return a bundle20 stream. |
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475 |
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476 `url` is the url the client thinks it's pushing to, which is |
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477 visible to hooks. |
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478 """ |
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479 |
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480 if heads != [b'force'] and self.capable(b'unbundlehash'): |
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481 heads = wireprototypes.encodelist( |
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482 [b'hashed', hashutil.sha1(b''.join(sorted(heads))).digest()] |
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483 ) |
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484 else: |
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485 heads = wireprototypes.encodelist(heads) |
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486 |
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487 if util.safehasattr(bundle, b'deltaheader'): |
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488 # this a bundle10, do the old style call sequence |
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489 ret, output = self._callpush(b"unbundle", bundle, heads=heads) |
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490 if ret == b"": |
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491 raise error.ResponseError(_(b'push failed:'), output) |
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492 try: |
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493 ret = int(ret) |
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494 except ValueError: |
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495 raise error.ResponseError( |
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496 _(b'push failed (unexpected response):'), ret |
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497 ) |
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498 |
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499 for l in output.splitlines(True): |
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500 self.ui.status(_(b'remote: '), l) |
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501 else: |
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502 # bundle2 push. Send a stream, fetch a stream. |
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503 stream = self._calltwowaystream(b'unbundle', bundle, heads=heads) |
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504 ret = bundle2.getunbundler(self.ui, stream) |
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505 return ret |
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|
506 |
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|
507 # End of ipeercommands interface. |
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|
508 |
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509 # Begin of ipeerlegacycommands interface. |
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510 |
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511 def branches(self, nodes): |
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512 n = wireprototypes.encodelist(nodes) |
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513 d = self._call(b"branches", nodes=n) |
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514 try: |
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515 br = [tuple(wireprototypes.decodelist(b)) for b in d.splitlines()] |
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516 return br |
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517 except ValueError: |
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518 self._abort(error.ResponseError(_(b"unexpected response:"), d)) |
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|
519 |
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520 def between(self, pairs): |
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521 batch = 8 # avoid giant requests |
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|
522 r = [] |
38783
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523 for i in pycompat.xrange(0, len(pairs), batch): |
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524 n = b" ".join( |
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|
525 [ |
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526 wireprototypes.encodelist(p, b'-') |
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527 for p in pairs[i : i + batch] |
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528 ] |
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529 ) |
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530 d = self._call(b"between", pairs=n) |
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531 try: |
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532 r.extend( |
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533 l and wireprototypes.decodelist(l) or [] |
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534 for l in d.splitlines() |
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|
535 ) |
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536 except ValueError: |
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537 self._abort(error.ResponseError(_(b"unexpected response:"), d)) |
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|
538 return r |
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|
539 |
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|
540 def changegroup(self, nodes, source): |
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|
541 n = wireprototypes.encodelist(nodes) |
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542 f = self._callcompressable(b"changegroup", roots=n) |
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543 return changegroupmod.cg1unpacker(f, b'UN') |
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|
544 |
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545 def changegroupsubset(self, bases, heads, source): |
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546 self.requirecap(b'changegroupsubset', _(b'look up remote changes')) |
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547 bases = wireprototypes.encodelist(bases) |
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548 heads = wireprototypes.encodelist(heads) |
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549 f = self._callcompressable( |
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550 b"changegroupsubset", bases=bases, heads=heads |
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551 ) |
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552 return changegroupmod.cg1unpacker(f, b'UN') |
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553 |
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554 # End of ipeerlegacycommands interface. |
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555 |
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556 def _submitbatch(self, req): |
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557 """run batch request <req> on the server |
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558 |
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559 Returns an iterator of the raw responses from the server. |
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|
560 """ |
36945
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|
561 ui = self.ui |
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562 if ui.debugflag and ui.configbool(b'devel', b'debug.peer-request'): |
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563 ui.debug(b'devel-peer-request: batched-content\n') |
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564 for op, args in req: |
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565 msg = b'devel-peer-request: - %s (%d arguments)\n' |
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566 ui.debug(msg % (op, len(args))) |
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567 |
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568 unescapearg = wireprototypes.unescapebatcharg |
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569 |
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570 rsp = self._callstream(b"batch", cmds=encodebatchcmds(req)) |
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571 chunk = rsp.read(1024) |
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572 work = [chunk] |
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573 while chunk: |
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574 while b';' not in chunk and chunk: |
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575 chunk = rsp.read(1024) |
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576 work.append(chunk) |
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577 merged = b''.join(work) |
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578 while b';' in merged: |
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579 one, merged = merged.split(b';', 1) |
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580 yield unescapearg(one) |
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581 chunk = rsp.read(1024) |
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582 work = [merged, chunk] |
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583 yield unescapearg(b''.join(work)) |
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584 |
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585 def _submitone(self, op, args): |
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586 return self._call(op, **pycompat.strkwargs(args)) |
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587 |
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588 def debugwireargs(self, one, two, three=None, four=None, five=None): |
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589 # don't pass optional arguments left at their default value |
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590 opts = {} |
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591 if three is not None: |
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592 opts['three'] = three |
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593 if four is not None: |
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594 opts['four'] = four |
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595 return self._call(b'debugwireargs', one=one, two=two, **opts) |
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596 |
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597 def _call(self, cmd, **args): |
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598 """execute <cmd> on the server |
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599 |
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600 The command is expected to return a simple string. |
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601 |
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602 returns the server reply as a string.""" |
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603 raise NotImplementedError() |
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604 |
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605 def _callstream(self, cmd, **args): |
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606 """execute <cmd> on the server |
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607 |
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608 The command is expected to return a stream. Note that if the |
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609 command doesn't return a stream, _callstream behaves |
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610 differently for ssh and http peers. |
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611 |
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612 returns the server reply as a file like object. |
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613 """ |
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614 raise NotImplementedError() |
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615 |
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616 def _callcompressable(self, cmd, **args): |
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617 """execute <cmd> on the server |
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618 |
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619 The command is expected to return a stream. |
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620 |
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|
621 The stream may have been compressed in some implementations. This |
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622 function takes care of the decompression. This is the only difference |
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623 with _callstream. |
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624 |
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625 returns the server reply as a file like object. |
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626 """ |
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627 raise NotImplementedError() |
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|
628 |
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629 def _callpush(self, cmd, fp, **args): |
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630 """execute a <cmd> on server |
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|
631 |
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632 The command is expected to be related to a push. Push has a special |
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633 return method. |
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|
634 |
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|
635 returns the server reply as a (ret, output) tuple. ret is either |
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636 empty (error) or a stringified int. |
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637 """ |
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638 raise NotImplementedError() |
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|
639 |
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|
640 def _calltwowaystream(self, cmd, fp, **args): |
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641 """execute <cmd> on server |
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642 |
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643 The command will send a stream to the server and get a stream in reply. |
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644 """ |
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645 raise NotImplementedError() |
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|
646 |
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647 def _abort(self, exception): |
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|
648 """clearly abort the wire protocol connection and raise the exception""" |
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649 raise NotImplementedError() |