Mercurial > hg
annotate mercurial/commandserver.py @ 28062:1000ccf804a6
chg: use in-tree hg executable to start server for testing
author | Yuya Nishihara <yuya@tcha.org> |
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date | Sun, 03 Jan 2016 12:45:32 +0900 |
parents | 14033c5dd261 |
children | 75f586a1bf55 |
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1 # commandserver.py - communicate with Mercurial's API over a pipe |
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2 # |
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3 # Copyright Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import SocketServer |
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11 import errno |
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12 import os |
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13 import struct |
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14 import sys |
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15 import traceback |
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16 |
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17 from .i18n import _ |
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18 from . import ( |
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19 encoding, |
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20 error, |
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21 util, |
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22 ) |
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23 |
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24 logfile = None |
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25 |
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26 def log(*args): |
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27 if not logfile: |
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28 return |
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29 |
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30 for a in args: |
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31 logfile.write(str(a)) |
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32 |
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33 logfile.flush() |
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34 |
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35 class channeledoutput(object): |
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36 """ |
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37 Write data to out in the following format: |
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38 |
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39 data length (unsigned int), |
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40 data |
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41 """ |
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42 def __init__(self, out, channel): |
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43 self.out = out |
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44 self.channel = channel |
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45 |
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46 @property |
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47 def name(self): |
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48 return '<%c-channel>' % self.channel |
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49 |
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50 def write(self, data): |
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51 if not data: |
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52 return |
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53 self.out.write(struct.pack('>cI', self.channel, len(data))) |
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54 self.out.write(data) |
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55 self.out.flush() |
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56 |
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57 def __getattr__(self, attr): |
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58 if attr in ('isatty', 'fileno', 'tell', 'seek'): |
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59 raise AttributeError(attr) |
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60 return getattr(self.out, attr) |
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61 |
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62 class channeledinput(object): |
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63 """ |
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64 Read data from in_. |
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65 |
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66 Requests for input are written to out in the following format: |
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67 channel identifier - 'I' for plain input, 'L' line based (1 byte) |
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68 how many bytes to send at most (unsigned int), |
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69 |
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70 The client replies with: |
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71 data length (unsigned int), 0 meaning EOF |
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72 data |
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73 """ |
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74 |
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75 maxchunksize = 4 * 1024 |
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76 |
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77 def __init__(self, in_, out, channel): |
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78 self.in_ = in_ |
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79 self.out = out |
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80 self.channel = channel |
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81 |
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82 @property |
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83 def name(self): |
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84 return '<%c-channel>' % self.channel |
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85 |
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86 def read(self, size=-1): |
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87 if size < 0: |
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88 # if we need to consume all the clients input, ask for 4k chunks |
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89 # so the pipe doesn't fill up risking a deadlock |
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90 size = self.maxchunksize |
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91 s = self._read(size, self.channel) |
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92 buf = s |
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93 while s: |
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94 s = self._read(size, self.channel) |
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95 buf += s |
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96 |
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97 return buf |
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98 else: |
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99 return self._read(size, self.channel) |
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100 |
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101 def _read(self, size, channel): |
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102 if not size: |
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103 return '' |
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104 assert size > 0 |
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105 |
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106 # tell the client we need at most size bytes |
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107 self.out.write(struct.pack('>cI', channel, size)) |
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108 self.out.flush() |
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109 |
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110 length = self.in_.read(4) |
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111 length = struct.unpack('>I', length)[0] |
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112 if not length: |
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113 return '' |
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114 else: |
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115 return self.in_.read(length) |
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116 |
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117 def readline(self, size=-1): |
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118 if size < 0: |
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119 size = self.maxchunksize |
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120 s = self._read(size, 'L') |
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121 buf = s |
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122 # keep asking for more until there's either no more or |
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123 # we got a full line |
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124 while s and s[-1] != '\n': |
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125 s = self._read(size, 'L') |
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126 buf += s |
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127 |
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128 return buf |
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129 else: |
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130 return self._read(size, 'L') |
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131 |
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132 def __iter__(self): |
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133 return self |
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134 |
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135 def next(self): |
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136 l = self.readline() |
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137 if not l: |
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138 raise StopIteration |
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139 return l |
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140 |
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141 def __getattr__(self, attr): |
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142 if attr in ('isatty', 'fileno', 'tell', 'seek'): |
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143 raise AttributeError(attr) |
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144 return getattr(self.in_, attr) |
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145 |
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146 class server(object): |
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147 """ |
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148 Listens for commands on fin, runs them and writes the output on a channel |
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149 based stream to fout. |
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150 """ |
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151 def __init__(self, ui, repo, fin, fout): |
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152 self.cwd = os.getcwd() |
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153 |
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154 # developer config: cmdserver.log |
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155 logpath = ui.config("cmdserver", "log", None) |
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156 if logpath: |
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157 global logfile |
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158 if logpath == '-': |
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159 # write log on a special 'd' (debug) channel |
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160 logfile = channeledoutput(fout, 'd') |
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161 else: |
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162 logfile = open(logpath, 'a') |
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163 |
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164 if repo: |
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165 # the ui here is really the repo ui so take its baseui so we don't |
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166 # end up with its local configuration |
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167 self.ui = repo.baseui |
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168 self.repo = repo |
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169 self.repoui = repo.ui |
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170 else: |
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171 self.ui = ui |
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172 self.repo = self.repoui = None |
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173 |
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174 self.cerr = channeledoutput(fout, 'e') |
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175 self.cout = channeledoutput(fout, 'o') |
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176 self.cin = channeledinput(fin, fout, 'I') |
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177 self.cresult = channeledoutput(fout, 'r') |
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178 |
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179 self.client = fin |
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180 |
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181 def _read(self, size): |
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182 if not size: |
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183 return '' |
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184 |
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185 data = self.client.read(size) |
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186 |
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187 # is the other end closed? |
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188 if not data: |
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189 raise EOFError |
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190 |
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191 return data |
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192 |
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193 def runcommand(self): |
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194 """ reads a list of \0 terminated arguments, executes |
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195 and writes the return code to the result channel """ |
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196 from . import dispatch # avoid cycle |
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197 |
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198 length = struct.unpack('>I', self._read(4))[0] |
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199 if not length: |
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200 args = [] |
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201 else: |
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202 args = self._read(length).split('\0') |
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203 |
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204 # copy the uis so changes (e.g. --config or --verbose) don't |
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205 # persist between requests |
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206 copiedui = self.ui.copy() |
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207 uis = [copiedui] |
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208 if self.repo: |
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209 self.repo.baseui = copiedui |
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210 # clone ui without using ui.copy because this is protected |
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211 repoui = self.repoui.__class__(self.repoui) |
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212 repoui.copy = copiedui.copy # redo copy protection |
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213 uis.append(repoui) |
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214 self.repo.ui = self.repo.dirstate._ui = repoui |
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215 self.repo.invalidateall() |
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216 |
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217 # reset last-print time of progress bar per command |
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218 # (progbar is singleton, we don't have to do for all uis) |
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219 if copiedui._progbar: |
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220 copiedui._progbar.resetstate() |
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221 |
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222 for ui in uis: |
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223 # any kind of interaction must use server channels, but chg may |
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224 # replace channels by fully functional tty files. so nontty is |
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225 # enforced only if cin is a channel. |
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226 if not util.safehasattr(self.cin, 'fileno'): |
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227 ui.setconfig('ui', 'nontty', 'true', 'commandserver') |
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228 |
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229 req = dispatch.request(args[:], copiedui, self.repo, self.cin, |
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230 self.cout, self.cerr) |
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231 |
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232 ret = (dispatch.dispatch(req) or 0) & 255 # might return None |
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233 |
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234 # restore old cwd |
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235 if '--cwd' in args: |
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236 os.chdir(self.cwd) |
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237 |
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238 self.cresult.write(struct.pack('>i', int(ret))) |
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239 |
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240 def getencoding(self): |
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241 """ writes the current encoding to the result channel """ |
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242 self.cresult.write(encoding.encoding) |
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243 |
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244 def serveone(self): |
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245 cmd = self.client.readline()[:-1] |
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246 if cmd: |
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247 handler = self.capabilities.get(cmd) |
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248 if handler: |
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249 handler(self) |
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250 else: |
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251 # clients are expected to check what commands are supported by |
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252 # looking at the servers capabilities |
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253 raise error.Abort(_('unknown command %s') % cmd) |
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254 |
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255 return cmd != '' |
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256 |
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257 capabilities = {'runcommand' : runcommand, |
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258 'getencoding' : getencoding} |
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259 |
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260 def serve(self): |
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261 hellomsg = 'capabilities: ' + ' '.join(sorted(self.capabilities)) |
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262 hellomsg += '\n' |
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263 hellomsg += 'encoding: ' + encoding.encoding |
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264 hellomsg += '\n' |
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265 hellomsg += 'pid: %d' % util.getpid() |
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266 |
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267 # write the hello msg in -one- chunk |
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268 self.cout.write(hellomsg) |
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269 |
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270 try: |
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271 while self.serveone(): |
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272 pass |
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273 except EOFError: |
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274 # we'll get here if the client disconnected while we were reading |
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275 # its request |
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276 return 1 |
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277 |
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278 return 0 |
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279 |
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280 def _protectio(ui): |
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281 """ duplicates streams and redirect original to null if ui uses stdio """ |
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282 ui.flush() |
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283 newfiles = [] |
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284 nullfd = os.open(os.devnull, os.O_RDWR) |
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285 for f, sysf, mode in [(ui.fin, sys.stdin, 'rb'), |
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286 (ui.fout, sys.stdout, 'wb')]: |
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287 if f is sysf: |
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288 newfd = os.dup(f.fileno()) |
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289 os.dup2(nullfd, f.fileno()) |
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290 f = os.fdopen(newfd, mode) |
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291 newfiles.append(f) |
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292 os.close(nullfd) |
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293 return tuple(newfiles) |
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294 |
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295 def _restoreio(ui, fin, fout): |
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296 """ restores streams from duplicated ones """ |
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297 ui.flush() |
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298 for f, uif in [(fin, ui.fin), (fout, ui.fout)]: |
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299 if f is not uif: |
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300 os.dup2(f.fileno(), uif.fileno()) |
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301 f.close() |
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302 |
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303 class pipeservice(object): |
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304 def __init__(self, ui, repo, opts): |
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305 self.ui = ui |
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306 self.repo = repo |
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307 |
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308 def init(self): |
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309 pass |
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310 |
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311 def run(self): |
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312 ui = self.ui |
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313 # redirect stdio to null device so that broken extensions or in-process |
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314 # hooks will never cause corruption of channel protocol. |
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315 fin, fout = _protectio(ui) |
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316 try: |
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317 sv = server(ui, self.repo, fin, fout) |
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318 return sv.serve() |
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319 finally: |
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|
320 _restoreio(ui, fin, fout) |
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321 |
22994
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322 class _requesthandler(SocketServer.StreamRequestHandler): |
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323 def handle(self): |
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324 ui = self.server.ui |
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325 repo = self.server.repo |
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326 sv = server(ui, repo, self.rfile, self.wfile) |
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327 try: |
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328 try: |
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329 sv.serve() |
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330 # handle exceptions that may be raised by command server. most of |
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331 # known exceptions are caught by dispatch. |
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332 except error.Abort as inst: |
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|
333 ui.warn(_('abort: %s\n') % inst) |
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|
334 except IOError as inst: |
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335 if inst.errno != errno.EPIPE: |
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336 raise |
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337 except KeyboardInterrupt: |
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338 pass |
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339 except: # re-raises |
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340 # also write traceback to error channel. otherwise client cannot |
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341 # see it because it is written to server's stderr by default. |
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342 traceback.print_exc(file=sv.cerr) |
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343 raise |
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344 |
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345 class unixservice(object): |
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346 """ |
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347 Listens on unix domain socket and forks server per connection |
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348 """ |
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349 def __init__(self, ui, repo, opts): |
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350 self.ui = ui |
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351 self.repo = repo |
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352 self.address = opts['address'] |
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353 if not util.safehasattr(SocketServer, 'UnixStreamServer'): |
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354 raise error.Abort(_('unsupported platform')) |
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355 if not self.address: |
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356 raise error.Abort(_('no socket path specified with --address')) |
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357 |
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358 def init(self): |
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359 class cls(SocketServer.ForkingMixIn, SocketServer.UnixStreamServer): |
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360 ui = self.ui |
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361 repo = self.repo |
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362 self.server = cls(self.address, _requesthandler) |
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363 self.ui.status(_('listening at %s\n') % self.address) |
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364 self.ui.flush() # avoid buffering of status message |
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365 |
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366 def run(self): |
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367 try: |
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368 self.server.serve_forever() |
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369 finally: |
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370 os.unlink(self.address) |
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371 |
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372 _servicemap = { |
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373 'pipe': pipeservice, |
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374 'unix': unixservice, |
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375 } |
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376 |
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377 def createservice(ui, repo, opts): |
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378 mode = opts['cmdserver'] |
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379 try: |
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380 return _servicemap[mode](ui, repo, opts) |
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381 except KeyError: |
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382 raise error.Abort(_('unknown mode %s') % mode) |