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@@ -1,238 +1,238 b'' | |||
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1 | 1 | # commandserver.py - communicate with Mercurial's API over a pipe |
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2 | 2 | # |
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3 | 3 | # Copyright Matt Mackall <mpm@selenic.com> |
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4 | 4 | # |
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5 | 5 | # This software may be used and distributed according to the terms of the |
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6 | 6 | # GNU General Public License version 2 or any later version. |
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7 | 7 | |
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8 | 8 | from i18n import _ |
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9 | 9 | import struct |
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10 | 10 | import sys, os |
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11 | 11 | import dispatch, encoding, util |
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12 | 12 | |
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13 | 13 | logfile = None |
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14 | 14 | |
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15 | 15 | def log(*args): |
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16 | 16 | if not logfile: |
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17 | 17 | return |
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18 | 18 | |
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19 | 19 | for a in args: |
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20 | 20 | logfile.write(str(a)) |
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21 | 21 | |
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22 | 22 | logfile.flush() |
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23 | 23 | |
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24 | 24 | class channeledoutput(object): |
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25 | 25 | """ |
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26 | 26 | Write data from in_ to out in the following format: |
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27 | 27 | |
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28 | 28 | data length (unsigned int), |
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29 | 29 | data |
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30 | 30 | """ |
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31 | 31 | def __init__(self, in_, out, channel): |
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32 | 32 | self.in_ = in_ |
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33 | 33 | self.out = out |
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34 | 34 | self.channel = channel |
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35 | 35 | |
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36 | 36 | def write(self, data): |
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37 | 37 | if not data: |
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38 | 38 | return |
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39 | 39 | self.out.write(struct.pack('>cI', self.channel, len(data))) |
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40 | 40 | self.out.write(data) |
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41 | 41 | self.out.flush() |
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42 | 42 | |
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43 | 43 | def __getattr__(self, attr): |
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44 | 44 | if attr in ('isatty', 'fileno'): |
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45 | 45 | raise AttributeError(attr) |
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46 | 46 | return getattr(self.in_, attr) |
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47 | 47 | |
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48 | 48 | class channeledinput(object): |
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49 | 49 | """ |
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50 | 50 | Read data from in_. |
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51 | 51 | |
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52 | 52 | Requests for input are written to out in the following format: |
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53 | 53 | channel identifier - 'I' for plain input, 'L' line based (1 byte) |
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54 | 54 | how many bytes to send at most (unsigned int), |
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55 | 55 | |
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56 | 56 | The client replies with: |
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57 | 57 | data length (unsigned int), 0 meaning EOF |
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58 | 58 | data |
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59 | 59 | """ |
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60 | 60 | |
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61 | 61 | maxchunksize = 4 * 1024 |
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62 | 62 | |
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63 | 63 | def __init__(self, in_, out, channel): |
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64 | 64 | self.in_ = in_ |
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65 | 65 | self.out = out |
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66 | 66 | self.channel = channel |
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67 | 67 | |
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68 | 68 | def read(self, size=-1): |
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69 | 69 | if size < 0: |
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70 | 70 | # if we need to consume all the clients input, ask for 4k chunks |
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71 | 71 | # so the pipe doesn't fill up risking a deadlock |
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72 | 72 | size = self.maxchunksize |
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73 | 73 | s = self._read(size, self.channel) |
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74 | 74 | buf = s |
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75 | 75 | while s: |
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76 | 76 | s = self._read(size, self.channel) |
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77 | 77 | buf += s |
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78 | 78 | |
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79 | 79 | return buf |
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80 | 80 | else: |
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81 | 81 | return self._read(size, self.channel) |
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82 | 82 | |
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83 | 83 | def _read(self, size, channel): |
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84 | 84 | if not size: |
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85 | 85 | return '' |
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86 | 86 | assert size > 0 |
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87 | 87 | |
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88 | 88 | # tell the client we need at most size bytes |
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89 | 89 | self.out.write(struct.pack('>cI', channel, size)) |
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90 | 90 | self.out.flush() |
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91 | 91 | |
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92 | 92 | length = self.in_.read(4) |
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93 | 93 | length = struct.unpack('>I', length)[0] |
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94 | 94 | if not length: |
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95 | 95 | return '' |
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96 | 96 | else: |
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97 | 97 | return self.in_.read(length) |
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98 | 98 | |
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99 | 99 | def readline(self, size=-1): |
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100 | 100 | if size < 0: |
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101 | 101 | size = self.maxchunksize |
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102 | 102 | s = self._read(size, 'L') |
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103 | 103 | buf = s |
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104 | 104 | # keep asking for more until there's either no more or |
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105 | 105 | # we got a full line |
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106 | 106 | while s and s[-1] != '\n': |
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107 | 107 | s = self._read(size, 'L') |
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108 | 108 | buf += s |
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109 | 109 | |
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110 | 110 | return buf |
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111 | 111 | else: |
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112 | 112 | return self._read(size, 'L') |
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113 | 113 | |
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114 | 114 | def __iter__(self): |
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115 | 115 | return self |
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116 | 116 | |
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117 | 117 | def next(self): |
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118 | 118 | l = self.readline() |
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119 | 119 | if not l: |
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120 | 120 | raise StopIteration |
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121 | 121 | return l |
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122 | 122 | |
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123 | 123 | def __getattr__(self, attr): |
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124 | 124 | if attr in ('isatty', 'fileno'): |
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125 | 125 | raise AttributeError(attr) |
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126 | 126 | return getattr(self.in_, attr) |
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127 | 127 | |
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128 | 128 | class server(object): |
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129 | 129 | """ |
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130 | 130 | Listens for commands on stdin, runs them and writes the output on a channel |
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131 | 131 | based stream to stdout. |
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132 | 132 | """ |
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133 | 133 | def __init__(self, ui, repo, mode): |
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134 | 134 | self.cwd = os.getcwd() |
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135 | 135 | |
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136 | 136 | logpath = ui.config("cmdserver", "log", None) |
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137 | 137 | if logpath: |
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138 | 138 | global logfile |
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139 | 139 | if logpath == '-': |
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140 | 140 | # write log on a special 'd' (debug) channel |
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141 | 141 | logfile = channeledoutput(sys.stdout, sys.stdout, 'd') |
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142 | 142 | else: |
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143 | 143 | logfile = open(logpath, 'a') |
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144 | 144 | |
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145 | 145 | # the ui here is really the repo ui so take its baseui so we don't end |
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146 | 146 | # up with its local configuration |
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147 | 147 | self.ui = repo.baseui |
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148 | 148 | self.repo = repo |
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149 | 149 | self.repoui = repo.ui |
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150 | 150 | |
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151 | 151 | if mode == 'pipe': |
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152 | 152 | self.cerr = channeledoutput(sys.stderr, sys.stdout, 'e') |
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153 | 153 | self.cout = channeledoutput(sys.stdout, sys.stdout, 'o') |
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154 | 154 | self.cin = channeledinput(sys.stdin, sys.stdout, 'I') |
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155 | 155 | self.cresult = channeledoutput(sys.stdout, sys.stdout, 'r') |
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156 | 156 | |
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157 | 157 | self.client = sys.stdin |
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158 | 158 | else: |
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159 | 159 | raise util.Abort(_('unknown mode %s') % mode) |
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160 | 160 | |
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161 | 161 | def _read(self, size): |
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162 | 162 | if not size: |
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163 | 163 | return '' |
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164 | 164 | |
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165 | 165 | data = self.client.read(size) |
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166 | 166 | |
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167 | 167 | # is the other end closed? |
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168 | 168 | if not data: |
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169 | 169 | raise EOFError |
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170 | 170 | |
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171 | 171 | return data |
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172 | 172 | |
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173 | 173 | def runcommand(self): |
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174 | 174 | """ reads a list of \0 terminated arguments, executes |
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175 | 175 | and writes the return code to the result channel """ |
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176 | 176 | |
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177 | 177 | length = struct.unpack('>I', self._read(4))[0] |
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178 | 178 | if not length: |
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179 | 179 | args = [] |
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180 | 180 | else: |
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181 | 181 | args = self._read(length).split('\0') |
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182 | 182 | |
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183 | 183 | # copy the uis so changes (e.g. --config or --verbose) don't |
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184 | 184 | # persist between requests |
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185 | 185 | copiedui = self.ui.copy() |
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186 | 186 | self.repo.baseui = copiedui |
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187 | 187 | self.repo.ui = self.repo.dirstate._ui = self.repoui.copy() |
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188 | 188 | self.repo.invalidate() |
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189 | 189 | self.repo.invalidatedirstate() |
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190 | 190 | |
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191 | 191 | req = dispatch.request(args[:], copiedui, self.repo, self.cin, |
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192 | 192 | self.cout, self.cerr) |
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193 | 193 | |
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194 | 194 | ret = dispatch.dispatch(req) or 0 # might return None |
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195 | 195 | |
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196 | 196 | # restore old cwd |
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197 | 197 | if '--cwd' in args: |
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198 | 198 | os.chdir(self.cwd) |
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199 | 199 | |
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200 | 200 | self.cresult.write(struct.pack('>i', int(ret))) |
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201 | 201 | |
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202 | 202 | def getencoding(self): |
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203 | 203 | """ writes the current encoding to the result channel """ |
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204 | 204 | self.cresult.write(encoding.encoding) |
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205 | 205 | |
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206 | 206 | def serveone(self): |
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207 | 207 | cmd = self.client.readline()[:-1] |
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208 | 208 | if cmd: |
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209 | 209 | handler = self.capabilities.get(cmd) |
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210 | 210 | if handler: |
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211 | 211 | handler(self) |
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212 | 212 | else: |
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213 | 213 | # clients are expected to check what commands are supported by |
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214 | 214 | # looking at the servers capabilities |
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215 | 215 | raise util.Abort(_('unknown command %s') % cmd) |
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216 | 216 | |
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217 | 217 | return cmd != '' |
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218 | 218 | |
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219 | 219 | capabilities = {'runcommand' : runcommand, |
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220 | 220 | 'getencoding' : getencoding} |
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221 | 221 | |
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222 | 222 | def serve(self): |
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223 |
hellomsg = 'capabilities: ' + ' '.join(self.capabilities |
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223 | hellomsg = 'capabilities: ' + ' '.join(sorted(self.capabilities)) | |
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224 | 224 | hellomsg += '\n' |
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225 | 225 | hellomsg += 'encoding: ' + encoding.encoding |
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226 | 226 | |
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227 | 227 | # write the hello msg in -one- chunk |
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228 | 228 | self.cout.write(hellomsg) |
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229 | 229 | |
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230 | 230 | try: |
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231 | 231 | while self.serveone(): |
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232 | 232 | pass |
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233 | 233 | except EOFError: |
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234 | 234 | # we'll get here if the client disconnected while we were reading |
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235 | 235 | # its request |
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236 | 236 | return 1 |
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237 | 237 | |
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238 | 238 | return 0 |
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