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@@ -1,538 +1,546 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 __future__ import absolute_import |
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9 | 9 | |
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10 | 10 | import errno |
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11 | 11 | import gc |
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12 | 12 | import os |
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13 | 13 | import random |
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14 | 14 | import signal |
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15 | 15 | import socket |
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16 | 16 | import struct |
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17 | 17 | import traceback |
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18 | 18 | |
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19 | 19 | try: |
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20 | 20 | import selectors |
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21 | 21 | selectors.BaseSelector |
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22 | 22 | except ImportError: |
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23 | 23 | from .thirdparty import selectors2 as selectors |
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24 | 24 | |
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25 | 25 | from .i18n import _ |
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26 | 26 | from . import ( |
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27 | 27 | encoding, |
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28 | 28 | error, |
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29 | 29 | util, |
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30 | 30 | ) |
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31 | 31 | from .utils import ( |
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32 | 32 | procutil, |
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33 | 33 | ) |
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34 | 34 | |
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35 | 35 | logfile = None |
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36 | 36 | |
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37 | 37 | def log(*args): |
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38 | 38 | if not logfile: |
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39 | 39 | return |
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40 | 40 | |
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41 | 41 | for a in args: |
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42 | 42 | logfile.write(str(a)) |
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43 | 43 | |
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44 | 44 | logfile.flush() |
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45 | 45 | |
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46 | 46 | class channeledoutput(object): |
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47 | 47 | """ |
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48 | 48 | Write data to out in the following format: |
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49 | 49 | |
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50 | 50 | data length (unsigned int), |
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51 | 51 | data |
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52 | 52 | """ |
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53 | 53 | def __init__(self, out, channel): |
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54 | 54 | self.out = out |
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55 | 55 | self.channel = channel |
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56 | 56 | |
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57 | 57 | @property |
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58 | 58 | def name(self): |
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59 | 59 | return '<%c-channel>' % self.channel |
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60 | 60 | |
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61 | 61 | def write(self, data): |
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62 | 62 | if not data: |
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63 | 63 | return |
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64 | 64 | # single write() to guarantee the same atomicity as the underlying file |
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65 | 65 | self.out.write(struct.pack('>cI', self.channel, len(data)) + data) |
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66 | 66 | self.out.flush() |
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67 | 67 | |
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68 | 68 | def __getattr__(self, attr): |
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69 | 69 | if attr in (r'isatty', r'fileno', r'tell', r'seek'): |
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70 | 70 | raise AttributeError(attr) |
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71 | 71 | return getattr(self.out, attr) |
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72 | 72 | |
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73 | 73 | class channeledinput(object): |
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74 | 74 | """ |
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75 | 75 | Read data from in_. |
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76 | 76 | |
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77 | 77 | Requests for input are written to out in the following format: |
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78 | 78 | channel identifier - 'I' for plain input, 'L' line based (1 byte) |
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79 | 79 | how many bytes to send at most (unsigned int), |
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80 | 80 | |
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81 | 81 | The client replies with: |
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82 | 82 | data length (unsigned int), 0 meaning EOF |
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83 | 83 | data |
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84 | 84 | """ |
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85 | 85 | |
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86 | 86 | maxchunksize = 4 * 1024 |
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87 | 87 | |
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88 | 88 | def __init__(self, in_, out, channel): |
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89 | 89 | self.in_ = in_ |
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90 | 90 | self.out = out |
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91 | 91 | self.channel = channel |
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92 | 92 | |
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93 | 93 | @property |
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94 | 94 | def name(self): |
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95 | 95 | return '<%c-channel>' % self.channel |
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96 | 96 | |
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97 | 97 | def read(self, size=-1): |
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98 | 98 | if size < 0: |
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99 | 99 | # if we need to consume all the clients input, ask for 4k chunks |
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100 | 100 | # so the pipe doesn't fill up risking a deadlock |
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101 | 101 | size = self.maxchunksize |
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102 | 102 | s = self._read(size, self.channel) |
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103 | 103 | buf = s |
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104 | 104 | while s: |
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105 | 105 | s = self._read(size, self.channel) |
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106 | 106 | buf += s |
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107 | 107 | |
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108 | 108 | return buf |
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109 | 109 | else: |
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110 | 110 | return self._read(size, self.channel) |
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111 | 111 | |
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112 | 112 | def _read(self, size, channel): |
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113 | 113 | if not size: |
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114 | 114 | return '' |
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115 | 115 | assert size > 0 |
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116 | 116 | |
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117 | 117 | # tell the client we need at most size bytes |
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118 | 118 | self.out.write(struct.pack('>cI', channel, size)) |
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119 | 119 | self.out.flush() |
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120 | 120 | |
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121 | 121 | length = self.in_.read(4) |
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122 | 122 | length = struct.unpack('>I', length)[0] |
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123 | 123 | if not length: |
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124 | 124 | return '' |
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125 | 125 | else: |
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126 | 126 | return self.in_.read(length) |
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127 | 127 | |
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128 | 128 | def readline(self, size=-1): |
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129 | 129 | if size < 0: |
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130 | 130 | size = self.maxchunksize |
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131 | 131 | s = self._read(size, 'L') |
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132 | 132 | buf = s |
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133 | 133 | # keep asking for more until there's either no more or |
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134 | 134 | # we got a full line |
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135 | 135 | while s and s[-1] != '\n': |
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136 | 136 | s = self._read(size, 'L') |
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137 | 137 | buf += s |
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138 | 138 | |
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139 | 139 | return buf |
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140 | 140 | else: |
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141 | 141 | return self._read(size, 'L') |
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142 | 142 | |
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143 | 143 | def __iter__(self): |
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144 | 144 | return self |
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145 | 145 | |
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146 | 146 | def next(self): |
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147 | 147 | l = self.readline() |
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148 | 148 | if not l: |
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149 | 149 | raise StopIteration |
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150 | 150 | return l |
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151 | 151 | |
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152 | 152 | __next__ = next |
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153 | 153 | |
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154 | 154 | def __getattr__(self, attr): |
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155 | 155 | if attr in (r'isatty', r'fileno', r'tell', r'seek'): |
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156 | 156 | raise AttributeError(attr) |
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157 | 157 | return getattr(self.in_, attr) |
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158 | 158 | |
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159 | 159 | class server(object): |
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160 | 160 | """ |
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161 | 161 | Listens for commands on fin, runs them and writes the output on a channel |
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162 | 162 | based stream to fout. |
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163 | 163 | """ |
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164 | 164 | def __init__(self, ui, repo, fin, fout): |
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165 | 165 | self.cwd = encoding.getcwd() |
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166 | 166 | |
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167 | 167 | # developer config: cmdserver.log |
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168 | 168 | logpath = ui.config("cmdserver", "log") |
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169 | 169 | if logpath: |
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170 | 170 | global logfile |
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171 | 171 | if logpath == '-': |
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172 | 172 | # write log on a special 'd' (debug) channel |
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173 | 173 | logfile = channeledoutput(fout, 'd') |
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174 | 174 | else: |
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175 | 175 | logfile = open(logpath, 'a') |
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176 | 176 | |
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177 | 177 | if repo: |
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178 | 178 | # the ui here is really the repo ui so take its baseui so we don't |
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179 | 179 | # end up with its local configuration |
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180 | 180 | self.ui = repo.baseui |
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181 | 181 | self.repo = repo |
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182 | 182 | self.repoui = repo.ui |
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183 | 183 | else: |
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184 | 184 | self.ui = ui |
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185 | 185 | self.repo = self.repoui = None |
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186 | 186 | |
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187 | 187 | self.cerr = channeledoutput(fout, 'e') |
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188 | 188 | self.cout = channeledoutput(fout, 'o') |
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189 | 189 | self.cin = channeledinput(fin, fout, 'I') |
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190 | 190 | self.cresult = channeledoutput(fout, 'r') |
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191 | 191 | |
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192 | 192 | self.client = fin |
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193 | 193 | |
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194 | 194 | def cleanup(self): |
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195 | 195 | """release and restore resources taken during server session""" |
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196 | 196 | |
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197 | 197 | def _read(self, size): |
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198 | 198 | if not size: |
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199 | 199 | return '' |
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200 | 200 | |
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201 | 201 | data = self.client.read(size) |
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202 | 202 | |
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203 | 203 | # is the other end closed? |
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204 | 204 | if not data: |
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205 | 205 | raise EOFError |
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206 | 206 | |
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207 | 207 | return data |
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208 | 208 | |
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209 | 209 | def _readstr(self): |
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210 | 210 | """read a string from the channel |
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211 | 211 | |
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212 | 212 | format: |
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213 | 213 | data length (uint32), data |
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214 | 214 | """ |
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215 | 215 | length = struct.unpack('>I', self._read(4))[0] |
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216 | 216 | if not length: |
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217 | 217 | return '' |
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218 | 218 | return self._read(length) |
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219 | 219 | |
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220 | 220 | def _readlist(self): |
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221 | 221 | """read a list of NULL separated strings from the channel""" |
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222 | 222 | s = self._readstr() |
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223 | 223 | if s: |
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224 | 224 | return s.split('\0') |
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225 | 225 | else: |
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226 | 226 | return [] |
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227 | 227 | |
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228 | 228 | def runcommand(self): |
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229 | 229 | """ reads a list of \0 terminated arguments, executes |
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230 | 230 | and writes the return code to the result channel """ |
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231 | 231 | from . import dispatch # avoid cycle |
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232 | 232 | |
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233 | 233 | args = self._readlist() |
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234 | 234 | |
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235 | 235 | # copy the uis so changes (e.g. --config or --verbose) don't |
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236 | 236 | # persist between requests |
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237 | 237 | copiedui = self.ui.copy() |
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238 | 238 | uis = [copiedui] |
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239 | 239 | if self.repo: |
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240 | 240 | self.repo.baseui = copiedui |
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241 | 241 | # clone ui without using ui.copy because this is protected |
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242 | 242 | repoui = self.repoui.__class__(self.repoui) |
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243 | 243 | repoui.copy = copiedui.copy # redo copy protection |
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244 | 244 | uis.append(repoui) |
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245 | 245 | self.repo.ui = self.repo.dirstate._ui = repoui |
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246 | 246 | self.repo.invalidateall() |
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247 | 247 | |
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248 | 248 | for ui in uis: |
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249 | 249 | ui.resetstate() |
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250 | 250 | # any kind of interaction must use server channels, but chg may |
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251 | 251 | # replace channels by fully functional tty files. so nontty is |
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252 | 252 | # enforced only if cin is a channel. |
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253 | 253 | if not util.safehasattr(self.cin, 'fileno'): |
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254 | 254 | ui.setconfig('ui', 'nontty', 'true', 'commandserver') |
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255 | 255 | |
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256 | 256 | req = dispatch.request(args[:], copiedui, self.repo, self.cin, |
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257 | 257 | self.cout, self.cerr) |
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258 | 258 | |
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259 | 259 | try: |
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260 | 260 | ret = dispatch.dispatch(req) & 255 |
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261 | 261 | self.cresult.write(struct.pack('>i', int(ret))) |
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262 | 262 | finally: |
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263 | 263 | # restore old cwd |
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264 | 264 | if '--cwd' in args: |
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265 | 265 | os.chdir(self.cwd) |
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266 | 266 | |
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267 | 267 | def getencoding(self): |
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268 | 268 | """ writes the current encoding to the result channel """ |
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269 | 269 | self.cresult.write(encoding.encoding) |
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270 | 270 | |
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271 | 271 | def serveone(self): |
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272 | 272 | cmd = self.client.readline()[:-1] |
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273 | 273 | if cmd: |
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274 | 274 | handler = self.capabilities.get(cmd) |
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275 | 275 | if handler: |
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276 | 276 | handler(self) |
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277 | 277 | else: |
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278 | 278 | # clients are expected to check what commands are supported by |
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279 | 279 | # looking at the servers capabilities |
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280 | 280 | raise error.Abort(_('unknown command %s') % cmd) |
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281 | 281 | |
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282 | 282 | return cmd != '' |
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283 | 283 | |
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284 | 284 | capabilities = {'runcommand': runcommand, |
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285 | 285 | 'getencoding': getencoding} |
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286 | 286 | |
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287 | 287 | def serve(self): |
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288 | 288 | hellomsg = 'capabilities: ' + ' '.join(sorted(self.capabilities)) |
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289 | 289 | hellomsg += '\n' |
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290 | 290 | hellomsg += 'encoding: ' + encoding.encoding |
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291 | 291 | hellomsg += '\n' |
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292 | 292 | hellomsg += 'pid: %d' % procutil.getpid() |
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293 | 293 | if util.safehasattr(os, 'getpgid'): |
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294 | 294 | hellomsg += '\n' |
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295 | 295 | hellomsg += 'pgid: %d' % os.getpgid(0) |
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296 | 296 | |
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297 | 297 | # write the hello msg in -one- chunk |
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298 | 298 | self.cout.write(hellomsg) |
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299 | 299 | |
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300 | 300 | try: |
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301 | 301 | while self.serveone(): |
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302 | 302 | pass |
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303 | 303 | except EOFError: |
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304 | 304 | # we'll get here if the client disconnected while we were reading |
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305 | 305 | # its request |
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306 | 306 | return 1 |
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307 | 307 | |
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308 | 308 | return 0 |
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309 | 309 | |
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310 | 310 | class pipeservice(object): |
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311 | 311 | def __init__(self, ui, repo, opts): |
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312 | 312 | self.ui = ui |
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313 | 313 | self.repo = repo |
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314 | 314 | |
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315 | 315 | def init(self): |
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316 | 316 | pass |
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317 | 317 | |
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318 | 318 | def run(self): |
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319 | 319 | ui = self.ui |
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320 | 320 | # redirect stdio to null device so that broken extensions or in-process |
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321 | 321 | # hooks will never cause corruption of channel protocol. |
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322 | 322 | with procutil.protectedstdio(ui.fin, ui.fout) as (fin, fout): |
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323 | 323 | try: |
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324 | 324 | sv = server(ui, self.repo, fin, fout) |
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325 | 325 | return sv.serve() |
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326 | 326 | finally: |
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327 | 327 | sv.cleanup() |
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328 | 328 | |
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329 | 329 | def _initworkerprocess(): |
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330 | 330 | # use a different process group from the master process, in order to: |
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331 | 331 | # 1. make the current process group no longer "orphaned" (because the |
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332 | 332 | # parent of this process is in a different process group while |
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333 | 333 | # remains in a same session) |
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334 | 334 | # according to POSIX 2.2.2.52, orphaned process group will ignore |
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335 | 335 | # terminal-generated stop signals like SIGTSTP (Ctrl+Z), which will |
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336 | 336 | # cause trouble for things like ncurses. |
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337 | 337 | # 2. the client can use kill(-pgid, sig) to simulate terminal-generated |
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338 | 338 | # SIGINT (Ctrl+C) and process-exit-generated SIGHUP. our child |
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339 | 339 | # processes like ssh will be killed properly, without affecting |
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340 | 340 | # unrelated processes. |
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341 | 341 | os.setpgid(0, 0) |
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342 | 342 | # change random state otherwise forked request handlers would have a |
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343 | 343 | # same state inherited from parent. |
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344 | 344 | random.seed() |
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345 | 345 | |
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346 | 346 | def _serverequest(ui, repo, conn, createcmdserver): |
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347 | 347 | fin = conn.makefile(r'rb') |
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348 | 348 | fout = conn.makefile(r'wb') |
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349 | 349 | sv = None |
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350 | 350 | try: |
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351 | 351 | sv = createcmdserver(repo, conn, fin, fout) |
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352 | 352 | try: |
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353 | 353 | sv.serve() |
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354 | 354 | # handle exceptions that may be raised by command server. most of |
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355 | 355 | # known exceptions are caught by dispatch. |
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356 | 356 | except error.Abort as inst: |
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357 | 357 | ui.error(_('abort: %s\n') % inst) |
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358 | 358 | except IOError as inst: |
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359 | 359 | if inst.errno != errno.EPIPE: |
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360 | 360 | raise |
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361 | 361 | except KeyboardInterrupt: |
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362 | 362 | pass |
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363 | 363 | finally: |
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364 | 364 | sv.cleanup() |
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365 | 365 | except: # re-raises |
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366 | 366 | # also write traceback to error channel. otherwise client cannot |
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367 | 367 | # see it because it is written to server's stderr by default. |
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368 | 368 | if sv: |
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369 | 369 | cerr = sv.cerr |
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370 | 370 | else: |
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371 | 371 | cerr = channeledoutput(fout, 'e') |
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372 | 372 | cerr.write(encoding.strtolocal(traceback.format_exc())) |
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373 | 373 | raise |
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374 | 374 | finally: |
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375 | 375 | fin.close() |
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376 | 376 | try: |
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377 | 377 | fout.close() # implicit flush() may cause another EPIPE |
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378 | 378 | except IOError as inst: |
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379 | 379 | if inst.errno != errno.EPIPE: |
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380 | 380 | raise |
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381 | 381 | |
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382 | 382 | class unixservicehandler(object): |
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383 | 383 | """Set of pluggable operations for unix-mode services |
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384 | 384 | |
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385 | 385 | Almost all methods except for createcmdserver() are called in the main |
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386 | 386 | process. You can't pass mutable resource back from createcmdserver(). |
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387 | 387 | """ |
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388 | 388 | |
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389 | 389 | pollinterval = None |
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390 | 390 | |
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391 | 391 | def __init__(self, ui): |
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392 | 392 | self.ui = ui |
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393 | 393 | |
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394 | 394 | def bindsocket(self, sock, address): |
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395 | 395 | util.bindunixsocket(sock, address) |
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396 | 396 | sock.listen(socket.SOMAXCONN) |
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397 | 397 | self.ui.status(_('listening at %s\n') % address) |
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398 | 398 | self.ui.flush() # avoid buffering of status message |
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399 | 399 | |
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400 | 400 | def unlinksocket(self, address): |
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401 | 401 | os.unlink(address) |
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402 | 402 | |
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403 | 403 | def shouldexit(self): |
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404 | 404 | """True if server should shut down; checked per pollinterval""" |
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405 | 405 | return False |
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406 | 406 | |
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407 | 407 | def newconnection(self): |
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408 | 408 | """Called when main process notices new connection""" |
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409 | 409 | |
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410 | 410 | def createcmdserver(self, repo, conn, fin, fout): |
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411 | 411 | """Create new command server instance; called in the process that |
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412 | 412 | serves for the current connection""" |
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413 | 413 | return server(self.ui, repo, fin, fout) |
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414 | 414 | |
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415 | 415 | class unixforkingservice(object): |
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416 | 416 | """ |
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417 | 417 | Listens on unix domain socket and forks server per connection |
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418 | 418 | """ |
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419 | 419 | |
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420 | 420 | def __init__(self, ui, repo, opts, handler=None): |
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421 | 421 | self.ui = ui |
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422 | 422 | self.repo = repo |
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423 | 423 | self.address = opts['address'] |
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424 | 424 | if not util.safehasattr(socket, 'AF_UNIX'): |
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425 | 425 | raise error.Abort(_('unsupported platform')) |
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426 | 426 | if not self.address: |
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427 | 427 | raise error.Abort(_('no socket path specified with --address')) |
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428 | 428 | self._servicehandler = handler or unixservicehandler(ui) |
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429 | 429 | self._sock = None |
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430 | 430 | self._oldsigchldhandler = None |
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431 | 431 | self._workerpids = set() # updated by signal handler; do not iterate |
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432 | 432 | self._socketunlinked = None |
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433 | 433 | |
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434 | 434 | def init(self): |
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435 | 435 | self._sock = socket.socket(socket.AF_UNIX) |
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436 | 436 | self._servicehandler.bindsocket(self._sock, self.address) |
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437 | 437 | if util.safehasattr(procutil, 'unblocksignal'): |
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438 | 438 | procutil.unblocksignal(signal.SIGCHLD) |
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439 | 439 | o = signal.signal(signal.SIGCHLD, self._sigchldhandler) |
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440 | 440 | self._oldsigchldhandler = o |
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441 | 441 | self._socketunlinked = False |
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442 | 442 | |
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443 | 443 | def _unlinksocket(self): |
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444 | 444 | if not self._socketunlinked: |
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445 | 445 | self._servicehandler.unlinksocket(self.address) |
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446 | 446 | self._socketunlinked = True |
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447 | 447 | |
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448 | 448 | def _cleanup(self): |
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449 | 449 | signal.signal(signal.SIGCHLD, self._oldsigchldhandler) |
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450 | 450 | self._sock.close() |
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451 | 451 | self._unlinksocket() |
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452 | 452 | # don't kill child processes as they have active clients, just wait |
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453 | 453 | self._reapworkers(0) |
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454 | 454 | |
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455 | 455 | def run(self): |
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456 | 456 | try: |
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457 | 457 | self._mainloop() |
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458 | 458 | finally: |
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459 | 459 | self._cleanup() |
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460 | 460 | |
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461 | 461 | def _mainloop(self): |
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462 | 462 | exiting = False |
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463 | 463 | h = self._servicehandler |
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464 | 464 | selector = selectors.DefaultSelector() |
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465 | 465 | selector.register(self._sock, selectors.EVENT_READ) |
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466 | 466 | while True: |
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467 | 467 | if not exiting and h.shouldexit(): |
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468 | 468 | # clients can no longer connect() to the domain socket, so |
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469 | 469 | # we stop queuing new requests. |
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470 | 470 | # for requests that are queued (connect()-ed, but haven't been |
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471 | 471 | # accept()-ed), handle them before exit. otherwise, clients |
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472 | 472 | # waiting for recv() will receive ECONNRESET. |
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473 | 473 | self._unlinksocket() |
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474 | 474 | exiting = True |
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475 | try: | |
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475 | 476 | ready = selector.select(timeout=h.pollinterval) |
|
477 | except OSError as inst: | |
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478 | # selectors2 raises ETIMEDOUT if timeout exceeded while | |
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479 | # handling signal interrupt. That's probably wrong, but | |
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480 | # we can easily get around it. | |
|
481 | if inst.errno != errno.ETIMEDOUT: | |
|
482 | raise | |
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483 | ready = [] | |
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476 | 484 | if not ready: |
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477 | 485 | # only exit if we completed all queued requests |
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478 | 486 | if exiting: |
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479 | 487 | break |
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480 | 488 | continue |
|
481 | 489 | try: |
|
482 | 490 | conn, _addr = self._sock.accept() |
|
483 | 491 | except socket.error as inst: |
|
484 | 492 | if inst.args[0] == errno.EINTR: |
|
485 | 493 | continue |
|
486 | 494 | raise |
|
487 | 495 | |
|
488 | 496 | pid = os.fork() |
|
489 | 497 | if pid: |
|
490 | 498 | try: |
|
491 | 499 | self.ui.debug('forked worker process (pid=%d)\n' % pid) |
|
492 | 500 | self._workerpids.add(pid) |
|
493 | 501 | h.newconnection() |
|
494 | 502 | finally: |
|
495 | 503 | conn.close() # release handle in parent process |
|
496 | 504 | else: |
|
497 | 505 | try: |
|
498 | 506 | selector.close() |
|
499 | 507 | self._sock.close() |
|
500 | 508 | self._runworker(conn) |
|
501 | 509 | conn.close() |
|
502 | 510 | os._exit(0) |
|
503 | 511 | except: # never return, hence no re-raises |
|
504 | 512 | try: |
|
505 | 513 | self.ui.traceback(force=True) |
|
506 | 514 | finally: |
|
507 | 515 | os._exit(255) |
|
508 | 516 | selector.close() |
|
509 | 517 | |
|
510 | 518 | def _sigchldhandler(self, signal, frame): |
|
511 | 519 | self._reapworkers(os.WNOHANG) |
|
512 | 520 | |
|
513 | 521 | def _reapworkers(self, options): |
|
514 | 522 | while self._workerpids: |
|
515 | 523 | try: |
|
516 | 524 | pid, _status = os.waitpid(-1, options) |
|
517 | 525 | except OSError as inst: |
|
518 | 526 | if inst.errno == errno.EINTR: |
|
519 | 527 | continue |
|
520 | 528 | if inst.errno != errno.ECHILD: |
|
521 | 529 | raise |
|
522 | 530 | # no child processes at all (reaped by other waitpid()?) |
|
523 | 531 | self._workerpids.clear() |
|
524 | 532 | return |
|
525 | 533 | if pid == 0: |
|
526 | 534 | # no waitable child processes |
|
527 | 535 | return |
|
528 | 536 | self.ui.debug('worker process exited (pid=%d)\n' % pid) |
|
529 | 537 | self._workerpids.discard(pid) |
|
530 | 538 | |
|
531 | 539 | def _runworker(self, conn): |
|
532 | 540 | signal.signal(signal.SIGCHLD, self._oldsigchldhandler) |
|
533 | 541 | _initworkerprocess() |
|
534 | 542 | h = self._servicehandler |
|
535 | 543 | try: |
|
536 | 544 | _serverequest(self.ui, self.repo, conn, h.createcmdserver) |
|
537 | 545 | finally: |
|
538 | 546 | gc.collect() # trigger __del__ since worker process uses os._exit |
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