Mercurial > hg
annotate mercurial/wireprotov1peer.py @ 50715:271a4ab29605 stable 6.4.5
relnotes: add 6.4.5
author | Raphaël Gomès <rgomes@octobus.net> |
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date | Thu, 22 Jun 2023 11:17:40 +0200 |
parents | d44e3c45f0e4 |
children | b1fb4185e47c |
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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 |
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9 import sys |
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10 import weakref |
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11 |
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12 from concurrent import futures |
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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)) for k, v in argsdict.items() |
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84 ) |
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85 cmds.append(b'%s %s' % (op, args)) |
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86 |
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87 return b';'.join(cmds) |
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88 |
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89 |
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90 class unsentfuture(futures.Future): |
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91 """A Future variation to represent an unsent command. |
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92 |
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93 Because we buffer commands and don't submit them immediately, calling |
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94 ``result()`` on an unsent future could deadlock. Futures for buffered |
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95 commands are represented by this type, which wraps ``result()`` to |
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96 call ``sendcommands()``. |
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97 """ |
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98 |
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99 def result(self, timeout=None): |
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100 if self.done(): |
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101 return futures.Future.result(self, timeout) |
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102 |
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103 self._peerexecutor.sendcommands() |
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104 |
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105 # This looks like it will infinitely recurse. However, |
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106 # sendcommands() should modify __class__. This call serves as a check |
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107 # on that. |
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108 return self.result(timeout) |
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109 |
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110 |
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111 @interfaceutil.implementer(repository.ipeercommandexecutor) |
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112 class peerexecutor: |
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113 def __init__(self, peer): |
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114 self._peer = peer |
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115 self._sent = False |
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116 self._closed = False |
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117 self._calls = [] |
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118 self._futures = weakref.WeakSet() |
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119 self._responseexecutor = None |
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120 self._responsef = None |
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121 |
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122 def __enter__(self): |
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123 return self |
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124 |
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125 def __exit__(self, exctype, excvalee, exctb): |
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126 self.close() |
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127 |
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128 def callcommand(self, command, args): |
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129 if self._sent: |
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130 raise error.ProgrammingError( |
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131 b'callcommand() cannot be used after commands are sent' |
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132 ) |
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133 |
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134 if self._closed: |
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135 raise error.ProgrammingError( |
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136 b'callcommand() cannot be used after close()' |
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137 ) |
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138 |
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139 # Commands are dispatched through methods on the peer. |
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140 fn = getattr(self._peer, pycompat.sysstr(command), None) |
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141 |
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142 if not fn: |
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143 raise error.ProgrammingError( |
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144 b'cannot call command %s: method of same name not available ' |
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145 b'on peer' % command |
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146 ) |
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147 |
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148 # Commands are either batchable or they aren't. If a command |
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149 # isn't batchable, we send it immediately because the executor |
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150 # can no longer accept new commands after a non-batchable command. |
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151 # If a command is batchable, we queue it for later. But we have |
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152 # to account for the case of a non-batchable command arriving after |
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153 # a batchable one and refuse to service it. |
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154 |
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155 def addcall(): |
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156 f = futures.Future() |
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157 self._futures.add(f) |
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158 self._calls.append((command, args, fn, f)) |
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159 return f |
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160 |
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161 if getattr(fn, 'batchable', False): |
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162 f = addcall() |
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163 |
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164 # But since we don't issue it immediately, we wrap its result() |
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165 # to trigger sending so we avoid deadlocks. |
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166 f.__class__ = unsentfuture |
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167 f._peerexecutor = self |
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168 else: |
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169 if self._calls: |
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170 raise error.ProgrammingError( |
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171 b'%s is not batchable and cannot be called on a command ' |
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172 b'executor along with other commands' % command |
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173 ) |
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174 |
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175 f = addcall() |
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176 |
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177 # Non-batchable commands can never coexist with another command |
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178 # in this executor. So send the command immediately. |
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179 self.sendcommands() |
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180 |
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181 return f |
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182 |
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183 def sendcommands(self): |
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184 if self._sent: |
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185 return |
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186 |
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187 if not self._calls: |
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188 return |
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189 |
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190 self._sent = True |
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191 |
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192 # Unhack any future types so caller seens a clean type and to break |
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193 # cycle between us and futures. |
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194 for f in self._futures: |
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195 if isinstance(f, unsentfuture): |
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196 f.__class__ = futures.Future |
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197 f._peerexecutor = None |
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198 |
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199 calls = self._calls |
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200 # Mainly to destroy references to futures. |
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201 self._calls = None |
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202 |
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203 # Simple case of a single command. We call it synchronously. |
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204 if len(calls) == 1: |
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205 command, args, fn, f = calls[0] |
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206 |
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207 # Future was cancelled. Ignore it. |
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208 if not f.set_running_or_notify_cancel(): |
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209 return |
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210 |
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211 try: |
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212 result = fn(**pycompat.strkwargs(args)) |
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213 except Exception: |
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214 pycompat.future_set_exception_info(f, sys.exc_info()[1:]) |
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215 else: |
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216 f.set_result(result) |
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217 |
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218 return |
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219 |
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220 # Batch commands are a bit harder. First, we have to deal with the |
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221 # @batchable coroutine. That's a bit annoying. Furthermore, we also |
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222 # need to preserve streaming. i.e. it should be possible for the |
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223 # futures to resolve as data is coming in off the wire without having |
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224 # to wait for the final byte of the final response. We do this by |
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225 # spinning up a thread to read the responses. |
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226 |
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227 requests = [] |
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228 states = [] |
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229 |
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230 for command, args, fn, f in calls: |
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231 # Future was cancelled. Ignore it. |
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232 if not f.set_running_or_notify_cancel(): |
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233 continue |
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234 |
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235 try: |
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236 encoded_args_or_res, decode = fn.batchable( |
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237 fn.__self__, **pycompat.strkwargs(args) |
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238 ) |
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239 except Exception: |
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240 pycompat.future_set_exception_info(f, sys.exc_info()[1:]) |
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241 return |
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242 |
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243 if not decode: |
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244 f.set_result(encoded_args_or_res) |
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245 else: |
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246 requests.append((command, encoded_args_or_res)) |
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247 states.append((command, f, batchable, decode)) |
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248 |
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249 if not requests: |
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250 return |
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251 |
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252 # This will emit responses in order they were executed. |
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253 wireresults = self._peer._submitbatch(requests) |
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254 |
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255 # The use of a thread pool executor here is a bit weird for something |
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256 # that only spins up a single thread. However, thread management is |
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257 # hard and it is easy to encounter race conditions, deadlocks, etc. |
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258 # concurrent.futures already solves these problems and its thread pool |
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259 # executor has minimal overhead. So we use it. |
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260 self._responseexecutor = futures.ThreadPoolExecutor(1) |
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261 self._responsef = self._responseexecutor.submit( |
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262 self._readbatchresponse, states, wireresults |
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263 ) |
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264 |
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265 def close(self): |
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266 self.sendcommands() |
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267 |
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268 if self._closed: |
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269 return |
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270 |
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271 self._closed = True |
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272 |
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273 if not self._responsef: |
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274 return |
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275 |
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276 # We need to wait on our in-flight response and then shut down the |
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277 # executor once we have a result. |
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278 try: |
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279 self._responsef.result() |
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280 finally: |
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281 self._responseexecutor.shutdown(wait=True) |
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282 self._responsef = None |
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283 self._responseexecutor = None |
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284 |
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285 # If any of our futures are still in progress, mark them as |
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286 # errored. Otherwise a result() could wait indefinitely. |
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287 for f in self._futures: |
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288 if not f.done(): |
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289 f.set_exception( |
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290 error.ResponseError( |
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291 _(b'unfulfilled batch command response'), None |
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292 ) |
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293 ) |
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294 |
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295 self._futures = None |
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296 |
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297 def _readbatchresponse(self, states, wireresults): |
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298 # Executes in a thread to read data off the wire. |
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299 |
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300 for command, f, batchable, decode in states: |
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301 # Grab raw result off the wire and teach the internal future |
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302 # about it. |
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303 try: |
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304 remoteresult = next(wireresults) |
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305 except StopIteration: |
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306 # This can happen in particular because next(batchable) |
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307 # in the previous iteration can call peer._abort, which |
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308 # may close the peer. |
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309 f.set_exception( |
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310 error.ResponseError( |
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311 _(b'unfulfilled batch command response'), None |
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312 ) |
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313 ) |
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314 else: |
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315 try: |
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316 result = decode(remoteresult) |
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317 except Exception: |
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318 pycompat.future_set_exception_info(f, sys.exc_info()[1:]) |
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319 else: |
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320 f.set_result(result) |
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321 |
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322 |
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323 @interfaceutil.implementer( |
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324 repository.ipeercommands, repository.ipeerlegacycommands |
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325 ) |
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326 class wirepeer(repository.peer): |
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327 """Client-side interface for communicating with a peer repository. |
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328 |
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329 Methods commonly call wire protocol commands of the same name. |
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330 |
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331 See also httppeer.py and sshpeer.py for protocol-specific |
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332 implementations of this interface. |
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333 """ |
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334 |
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335 def commandexecutor(self): |
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336 return peerexecutor(self) |
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337 |
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338 # Begin of ipeercommands interface. |
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339 |
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340 def clonebundles(self): |
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341 self.requirecap(b'clonebundles', _(b'clone bundles')) |
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342 return self._call(b'clonebundles') |
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343 |
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344 @batchable |
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345 def lookup(self, key): |
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346 self.requirecap(b'lookup', _(b'look up remote revision')) |
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347 |
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348 def decode(d): |
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349 success, data = d[:-1].split(b" ", 1) |
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350 if int(success): |
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351 return bin(data) |
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352 else: |
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353 self._abort(error.RepoError(data)) |
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354 |
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355 return {b'key': encoding.fromlocal(key)}, decode |
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356 |
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357 @batchable |
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358 def heads(self): |
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359 def decode(d): |
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360 try: |
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361 return wireprototypes.decodelist(d[:-1]) |
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362 except ValueError: |
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363 self._abort(error.ResponseError(_(b"unexpected response:"), d)) |
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364 |
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365 return {}, decode |
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366 |
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367 @batchable |
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368 def known(self, nodes): |
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369 def decode(d): |
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370 try: |
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371 return [bool(int(b)) for b in pycompat.iterbytestr(d)] |
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372 except ValueError: |
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373 self._abort(error.ResponseError(_(b"unexpected response:"), d)) |
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374 |
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375 return {b'nodes': wireprototypes.encodelist(nodes)}, decode |
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376 |
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377 @batchable |
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378 def branchmap(self): |
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379 def decode(d): |
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380 try: |
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381 branchmap = {} |
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382 for branchpart in d.splitlines(): |
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383 branchname, branchheads = branchpart.split(b' ', 1) |
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384 branchname = encoding.tolocal(urlreq.unquote(branchname)) |
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385 branchheads = wireprototypes.decodelist(branchheads) |
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386 branchmap[branchname] = branchheads |
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387 return branchmap |
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388 except TypeError: |
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389 self._abort(error.ResponseError(_(b"unexpected response:"), d)) |
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390 |
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391 return {}, decode |
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392 |
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393 @batchable |
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394 def listkeys(self, namespace): |
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395 if not self.capable(b'pushkey'): |
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396 return {}, None |
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397 self.ui.debug(b'preparing listkeys for "%s"\n' % namespace) |
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398 |
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399 def decode(d): |
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400 self.ui.debug( |
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401 b'received listkey for "%s": %i bytes\n' % (namespace, len(d)) |
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402 ) |
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403 return pushkeymod.decodekeys(d) |
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404 |
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405 return {b'namespace': encoding.fromlocal(namespace)}, decode |
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406 |
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407 @batchable |
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408 def pushkey(self, namespace, key, old, new): |
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409 if not self.capable(b'pushkey'): |
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410 return False, None |
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411 self.ui.debug(b'preparing pushkey for "%s:%s"\n' % (namespace, key)) |
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412 |
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413 def decode(d): |
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414 d, output = d.split(b'\n', 1) |
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415 try: |
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416 d = bool(int(d)) |
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417 except ValueError: |
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418 raise error.ResponseError( |
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419 _(b'push failed (unexpected response):'), d |
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420 ) |
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421 for l in output.splitlines(True): |
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422 self.ui.status(_(b'remote: '), l) |
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423 return d |
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424 |
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425 return { |
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426 b'namespace': encoding.fromlocal(namespace), |
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427 b'key': encoding.fromlocal(key), |
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428 b'old': encoding.fromlocal(old), |
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429 b'new': encoding.fromlocal(new), |
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430 }, decode |
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431 |
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432 def stream_out(self): |
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433 return self._callstream(b'stream_out') |
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434 |
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435 def getbundle(self, source, **kwargs): |
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436 kwargs = pycompat.byteskwargs(kwargs) |
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437 self.requirecap(b'getbundle', _(b'look up remote changes')) |
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438 opts = {} |
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439 bundlecaps = kwargs.get(b'bundlecaps') or set() |
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440 for key, value in kwargs.items(): |
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441 if value is None: |
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442 continue |
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443 keytype = wireprototypes.GETBUNDLE_ARGUMENTS.get(key) |
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444 if keytype is None: |
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445 raise error.ProgrammingError( |
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446 b'Unexpectedly None keytype for key %s' % key |
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447 ) |
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448 elif keytype == b'nodes': |
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449 value = wireprototypes.encodelist(value) |
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450 elif keytype == b'csv': |
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451 value = b','.join(value) |
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452 elif keytype == b'scsv': |
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453 value = b','.join(sorted(value)) |
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454 elif keytype == b'boolean': |
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455 value = b'%i' % bool(value) |
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456 elif keytype != b'plain': |
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457 raise KeyError(b'unknown getbundle option type %s' % keytype) |
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458 opts[key] = value |
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459 f = self._callcompressable(b"getbundle", **pycompat.strkwargs(opts)) |
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460 if any((cap.startswith(b'HG2') for cap in bundlecaps)): |
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461 return bundle2.getunbundler(self.ui, f) |
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462 else: |
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463 return changegroupmod.cg1unpacker(f, b'UN') |
13741
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wireproto: add getbundle() function
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13726
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464 |
37646
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465 def unbundle(self, bundle, heads, url): |
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466 """Send cg (a readable file-like object representing the |
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467 changegroup to push, typically a chunkbuffer object) to the |
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468 remote server as a bundle. |
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469 |
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470 When pushing a bundle10 stream, return an integer indicating the |
32880
4c2a46f89f08
wireproto: update reference to deleted addchangegroup()
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471 result of the push (see changegroup.apply()). |
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472 |
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473 When pushing a bundle20 stream, return a bundle20 stream. |
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474 |
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475 `url` is the url the client thinks it's pushing to, which is |
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476 visible to hooks. |
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477 """ |
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478 |
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479 if heads != [b'force'] and self.capable(b'unbundlehash'): |
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480 heads = wireprototypes.encodelist( |
44060
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core: migrate uses of hashlib.sha1 to hashutil.sha1
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481 [b'hashed', hashutil.sha1(b''.join(sorted(heads))).digest()] |
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482 ) |
13942
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483 else: |
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484 heads = wireprototypes.encodelist(heads) |
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|
485 |
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486 if util.safehasattr(bundle, b'deltaheader'): |
21075
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487 # this a bundle10, do the old style call sequence |
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488 ret, output = self._callpush(b"unbundle", bundle, heads=heads) |
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489 if ret == b"": |
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490 raise error.ResponseError(_(b'push failed:'), output) |
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491 try: |
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492 ret = int(ret) |
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493 except ValueError: |
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494 raise error.ResponseError( |
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495 _(b'push failed (unexpected response):'), ret |
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496 ) |
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|
497 |
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498 for l in output.splitlines(True): |
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499 self.ui.status(_(b'remote: '), l) |
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500 else: |
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501 # bundle2 push. Send a stream, fetch a stream. |
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502 stream = self._calltwowaystream(b'unbundle', bundle, heads=heads) |
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|
503 ret = bundle2.getunbundler(self.ui, stream) |
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|
504 return ret |
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|
505 |
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|
506 # End of ipeercommands interface. |
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|
507 |
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|
508 # Begin of ipeerlegacycommands interface. |
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509 |
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|
510 def branches(self, nodes): |
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511 n = wireprototypes.encodelist(nodes) |
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512 d = self._call(b"branches", nodes=n) |
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513 try: |
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514 br = [tuple(wireprototypes.decodelist(b)) for b in d.splitlines()] |
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|
515 return br |
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516 except ValueError: |
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|
517 self._abort(error.ResponseError(_(b"unexpected response:"), d)) |
33806
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|
518 |
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|
519 def between(self, pairs): |
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|
520 batch = 8 # avoid giant requests |
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|
521 r = [] |
49284
d44e3c45f0e4
py3: replace `pycompat.xrange` by `range`
Manuel Jacob <me@manueljacob.de>
parents:
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|
522 for i in range(0, len(pairs), batch): |
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|
523 n = b" ".join( |
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|
524 [ |
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|
525 wireprototypes.encodelist(p, b'-') |
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|
526 for p in pairs[i : i + batch] |
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|
527 ] |
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|
528 ) |
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|
529 d = self._call(b"between", pairs=n) |
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|
530 try: |
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|
531 r.extend( |
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|
532 l and wireprototypes.decodelist(l) or [] |
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|
533 for l in d.splitlines() |
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|
534 ) |
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|
535 except ValueError: |
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|
536 self._abort(error.ResponseError(_(b"unexpected response:"), d)) |
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|
537 return r |
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diff
changeset
|
538 |
37635
cc8c06835097
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37633
diff
changeset
|
539 def changegroup(self, nodes, source): |
37612
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|
540 n = wireprototypes.encodelist(nodes) |
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|
541 f = self._callcompressable(b"changegroup", roots=n) |
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|
542 return changegroupmod.cg1unpacker(f, b'UN') |
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|
543 |
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|
544 def changegroupsubset(self, bases, heads, source): |
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|
545 self.requirecap(b'changegroupsubset', _(b'look up remote changes')) |
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|
546 bases = wireprototypes.encodelist(bases) |
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|
547 heads = wireprototypes.encodelist(heads) |
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548 f = self._callcompressable( |
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|
549 b"changegroupsubset", bases=bases, heads=heads |
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|
550 ) |
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551 return changegroupmod.cg1unpacker(f, b'UN') |
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|
552 |
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|
553 # End of ipeerlegacycommands interface. |
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|
554 |
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|
555 def _submitbatch(self, req): |
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|
556 """run batch request <req> on the server |
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|
557 |
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|
558 Returns an iterator of the raw responses from the server. |
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|
559 """ |
36945
4901d1e22b27
peer-request: include more details about batch commands
Boris Feld <boris.feld@octobus.net>
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changeset
|
560 ui = self.ui |
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|
561 if ui.debugflag and ui.configbool(b'devel', b'debug.peer-request'): |
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|
562 ui.debug(b'devel-peer-request: batched-content\n') |
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563 for op, args in req: |
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564 msg = b'devel-peer-request: - %s (%d arguments)\n' |
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565 ui.debug(msg % (op, len(args))) |
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566 |
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567 unescapearg = wireprototypes.unescapebatcharg |
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568 |
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569 rsp = self._callstream(b"batch", cmds=encodebatchcmds(req)) |
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570 chunk = rsp.read(1024) |
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571 work = [chunk] |
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572 while chunk: |
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573 while b';' not in chunk and chunk: |
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574 chunk = rsp.read(1024) |
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575 work.append(chunk) |
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576 merged = b''.join(work) |
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577 while b';' in merged: |
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578 one, merged = merged.split(b';', 1) |
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579 yield unescapearg(one) |
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580 chunk = rsp.read(1024) |
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581 work = [merged, chunk] |
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582 yield unescapearg(b''.join(work)) |
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583 |
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584 def _submitone(self, op, args): |
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585 return self._call(op, **pycompat.strkwargs(args)) |
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586 |
14048
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wireproto: add test for new optional arg missing on server
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587 def debugwireargs(self, one, two, three=None, four=None, five=None): |
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588 # don't pass optional arguments left at their default value |
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589 opts = {} |
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590 if three is not None: |
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591 opts['three'] = three |
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592 if four is not None: |
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593 opts['four'] = four |
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594 return self._call(b'debugwireargs', one=one, two=two, **opts) |
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595 |
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596 def _call(self, cmd, **args): |
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597 """execute <cmd> on the server |
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598 |
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599 The command is expected to return a simple string. |
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600 |
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601 returns the server reply as a string.""" |
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602 raise NotImplementedError() |
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603 |
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604 def _callstream(self, cmd, **args): |
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605 """execute <cmd> on the server |
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606 |
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607 The command is expected to return a stream. Note that if the |
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608 command doesn't return a stream, _callstream behaves |
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609 differently for ssh and http peers. |
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610 |
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611 returns the server reply as a file like object. |
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612 """ |
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613 raise NotImplementedError() |
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614 |
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615 def _callcompressable(self, cmd, **args): |
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616 """execute <cmd> on the server |
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617 |
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618 The command is expected to return a stream. |
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619 |
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620 The stream may have been compressed in some implementations. This |
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621 function takes care of the decompression. This is the only difference |
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622 with _callstream. |
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623 |
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624 returns the server reply as a file like object. |
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625 """ |
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626 raise NotImplementedError() |
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|
627 |
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628 def _callpush(self, cmd, fp, **args): |
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629 """execute a <cmd> on server |
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630 |
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631 The command is expected to be related to a push. Push has a special |
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632 return method. |
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633 |
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634 returns the server reply as a (ret, output) tuple. ret is either |
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635 empty (error) or a stringified int. |
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636 """ |
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637 raise NotImplementedError() |
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|
638 |
21072
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wireproto: add a _calltwowaystream method on wirepeer
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|
639 def _calltwowaystream(self, cmd, fp, **args): |
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640 """execute <cmd> on server |
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641 |
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642 The command will send a stream to the server and get a stream in reply. |
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643 """ |
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644 raise NotImplementedError() |
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645 |
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646 def _abort(self, exception): |
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647 """clearly abort the wire protocol connection and raise the exception""" |
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648 raise NotImplementedError() |