Mercurial > public > mercurial-scm > hg-stable

annotate mercurial/commandserver.py @ 20631:5d4606bec54c

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cmdserver: mask return code of runcommand in the same way as dispatch.run "hg help" does not state that the code for abort is 255, but it's confusing to have different code between hg command and command server. Tests of python-hglib 1.2 passed with this change.
author Yuya Nishihara <yuya@tcha.org>
date Mon, 03 Mar 2014 15:50:51 +0900
parents a42ea6d209e6
children e811b93f2cb1
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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 i18n import _
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9 import struct
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10 import sys, os
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11 import dispatch, encoding, util
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12
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13 logfile = None
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14
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15 def log(*args):
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16 if not logfile:
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17 return
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18
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19 for a in args:
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20 logfile.write(str(a))
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21
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22 logfile.flush()
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23
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24 class channeledoutput(object):
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25 """
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26 Write data from in_ to out in the following format:
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27
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28 data length (unsigned int),
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29 data
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30 """
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31 def __init__(self, in_, out, channel):
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32 self.in_ = in_
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33 self.out = out
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34 self.channel = channel
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35
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36 def write(self, data):
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37 if not data:
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38 return
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39 self.out.write(struct.pack('>cI', self.channel, len(data)))
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40 self.out.write(data)
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41 self.out.flush()
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42
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43 def __getattr__(self, attr):
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44 if attr in ('isatty', 'fileno'):
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45 raise AttributeError(attr)
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46 return getattr(self.in_, attr)
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47
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48 class channeledinput(object):
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49 """
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50 Read data from in_.
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51
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52 Requests for input are written to out in the following format:
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53 channel identifier - 'I' for plain input, 'L' line based (1 byte)
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54 how many bytes to send at most (unsigned int),
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55
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56 The client replies with:
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57 data length (unsigned int), 0 meaning EOF
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58 data
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59 """
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60
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61 maxchunksize = 4 * 1024
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62
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63 def __init__(self, in_, out, channel):
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64 self.in_ = in_
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65 self.out = out
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66 self.channel = channel
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67
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68 def read(self, size=-1):
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69 if size < 0:
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70 # if we need to consume all the clients input, ask for 4k chunks
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71 # so the pipe doesn't fill up risking a deadlock
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72 size = self.maxchunksize
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73 s = self._read(size, self.channel)
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74 buf = s
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75 while s:
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76 s = self._read(size, self.channel)
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77 buf += s
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78
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79 return buf
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80 else:
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81 return self._read(size, self.channel)
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82
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83 def _read(self, size, channel):
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84 if not size:
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85 return ''
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86 assert size > 0
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87
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88 # tell the client we need at most size bytes
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89 self.out.write(struct.pack('>cI', channel, size))
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90 self.out.flush()
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91
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92 length = self.in_.read(4)
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93 length = struct.unpack('>I', length)[0]
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94 if not length:
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95 return ''
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96 else:
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97 return self.in_.read(length)
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98
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99 def readline(self, size=-1):
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100 if size < 0:
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101 size = self.maxchunksize
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102 s = self._read(size, 'L')
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103 buf = s
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104 # keep asking for more until there's either no more or
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105 # we got a full line
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106 while s and s[-1] != '\n':
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107 s = self._read(size, 'L')
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108 buf += s
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109
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110 return buf
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111 else:
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112 return self._read(size, 'L')
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113
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114 def __iter__(self):
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115 return self
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116
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117 def next(self):
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118 l = self.readline()
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119 if not l:
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120 raise StopIteration
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121 return l
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122
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123 def __getattr__(self, attr):
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124 if attr in ('isatty', 'fileno'):
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125 raise AttributeError(attr)
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126 return getattr(self.in_, attr)
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127
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128 class server(object):
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129 """
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130 Listens for commands on stdin, runs them and writes the output on a channel
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131 based stream to stdout.
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132 """
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133 def __init__(self, ui, repo, mode):
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134 self.cwd = os.getcwd()
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135
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136 logpath = ui.config("cmdserver", "log", None)
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137 if logpath:
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138 global logfile
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139 if logpath == '-':
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140 # write log on a special 'd' (debug) channel
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141 logfile = channeledoutput(sys.stdout, sys.stdout, 'd')
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142 else:
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143 logfile = open(logpath, 'a')
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144
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145 # the ui here is really the repo ui so take its baseui so we don't end
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146 # up with its local configuration
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147 self.ui = repo.baseui
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148 self.repo = repo
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149 self.repoui = repo.ui
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150
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151 if mode == 'pipe':
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152 self.cerr = channeledoutput(sys.stderr, sys.stdout, 'e')
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153 self.cout = channeledoutput(sys.stdout, sys.stdout, 'o')
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154 self.cin = channeledinput(sys.stdin, sys.stdout, 'I')
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155 self.cresult = channeledoutput(sys.stdout, sys.stdout, 'r')
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156
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157 self.client = sys.stdin
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158 else:
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159 raise util.Abort(_('unknown mode %s') % mode)
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160
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161 def _read(self, size):
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162 if not size:
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163 return ''
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164
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165 data = self.client.read(size)
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166
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167 # is the other end closed?
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168 if not data:
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169 raise EOFError
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170
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171 return data
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172
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173 def runcommand(self):
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174 """ reads a list of \0 terminated arguments, executes
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175 and writes the return code to the result channel """
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176
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177 length = struct.unpack('>I', self._read(4))[0]
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178 if not length:
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179 args = []
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180 else:
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181 args = self._read(length).split('\0')
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182
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183 # copy the uis so changes (e.g. --config or --verbose) don't
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184 # persist between requests
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185 copiedui = self.ui.copy()
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186 self.repo.baseui = copiedui
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187 # clone ui without using ui.copy because this is protected
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188 repoui = self.repoui.__class__(self.repoui)
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189 repoui.copy = copiedui.copy # redo copy protection
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190 self.repo.ui = self.repo.dirstate._ui = repoui
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191 self.repo.invalidateall()
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192
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193 req = dispatch.request(args[:], copiedui, self.repo, self.cin,
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194 self.cout, self.cerr)
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195
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196 ret = (dispatch.dispatch(req) or 0) & 255 # might return None
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197
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198 # restore old cwd
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199 if '--cwd' in args:
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200 os.chdir(self.cwd)
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201
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202 self.cresult.write(struct.pack('>i', int(ret)))
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203
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204 def getencoding(self):
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205 """ writes the current encoding to the result channel """
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206 self.cresult.write(encoding.encoding)
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207
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208 def serveone(self):
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209 cmd = self.client.readline()[:-1]
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210 if cmd:
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211 handler = self.capabilities.get(cmd)
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212 if handler:
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213 handler(self)
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214 else:
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215 # clients are expected to check what commands are supported by
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216 # looking at the servers capabilities
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217 raise util.Abort(_('unknown command %s') % cmd)
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218
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219 return cmd != ''
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220
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221 capabilities = {'runcommand' : runcommand,
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222 'getencoding' : getencoding}
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223
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224 def serve(self):
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225 hellomsg = 'capabilities: ' + ' '.join(sorted(self.capabilities))
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226 hellomsg += '\n'
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227 hellomsg += 'encoding: ' + encoding.encoding
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228
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229 # write the hello msg in -one- chunk
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230 self.cout.write(hellomsg)
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231
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232 try:
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233 while self.serveone():
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234 pass
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235 except EOFError:
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236 # we'll get here if the client disconnected while we were reading
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237 # its request
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238 return 1
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239
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240 return 0