Mercurial > hg
annotate mercurial/wireprotoserver.py @ 35997:24f05489377b
rebase: make "successors" a set in _computeobsoletenotrebased()
There's no apparent reason for this variable to be a list and this
avoids converting it to a set when needed.
author | Denis Laxalde <denis@laxalde.org> |
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date | Sat, 10 Feb 2018 19:33:19 +0100 |
parents | 04231e893a12 |
children | 5767664d39a5 |
rev | line source |
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1 # Copyright 21 May 2005 - (c) 2005 Jake Edge <jake@edge2.net> |
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2 # Copyright 2005-2007 Matt Mackall <mpm@selenic.com> |
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3 # |
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4 # This software may be used and distributed according to the terms of the |
10263 | 5 # GNU General Public License version 2 or any later version. |
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6 |
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7 from __future__ import absolute_import |
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8 |
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9 import abc |
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10 import cgi |
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11 import struct |
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12 import sys |
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13 |
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14 from .i18n import _ |
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15 from . import ( |
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16 encoding, |
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17 error, |
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18 hook, |
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19 pycompat, |
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20 util, |
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21 wireproto, |
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22 ) |
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23 |
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24 stringio = util.stringio |
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25 |
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26 urlerr = util.urlerr |
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27 urlreq = util.urlreq |
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28 |
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29 HTTP_OK = 200 |
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30 |
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31 HGTYPE = 'application/mercurial-0.1' |
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32 HGTYPE2 = 'application/mercurial-0.2' |
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33 HGERRTYPE = 'application/hg-error' |
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34 |
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35 # Names of the SSH protocol implementations. |
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36 SSHV1 = 'ssh-v1' |
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37 # This is advertised over the wire. Incremental the counter at the end |
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38 # to reflect BC breakages. |
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39 SSHV2 = 'exp-ssh-v2-0001' |
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40 |
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41 class baseprotocolhandler(object): |
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42 """Abstract base class for wire protocol handlers. |
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43 |
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44 A wire protocol handler serves as an interface between protocol command |
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45 handlers and the wire protocol transport layer. Protocol handlers provide |
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46 methods to read command arguments, redirect stdio for the duration of |
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47 the request, handle response types, etc. |
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48 """ |
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49 |
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50 __metaclass__ = abc.ABCMeta |
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51 |
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52 @abc.abstractproperty |
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53 def name(self): |
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54 """The name of the protocol implementation. |
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55 |
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56 Used for uniquely identifying the transport type. |
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57 """ |
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58 |
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59 @abc.abstractmethod |
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60 def getargs(self, args): |
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61 """return the value for arguments in <args> |
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62 |
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63 returns a list of values (same order as <args>)""" |
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64 |
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65 @abc.abstractmethod |
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66 def getfile(self, fp): |
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67 """write the whole content of a file into a file like object |
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68 |
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69 The file is in the form:: |
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70 |
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71 (<chunk-size>\n<chunk>)+0\n |
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72 |
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73 chunk size is the ascii version of the int. |
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74 """ |
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75 |
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76 @abc.abstractmethod |
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77 def redirect(self): |
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78 """may setup interception for stdout and stderr |
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79 |
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80 See also the `restore` method.""" |
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81 |
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82 # If the `redirect` function does install interception, the `restore` |
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83 # function MUST be defined. If interception is not used, this function |
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84 # MUST NOT be defined. |
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85 # |
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86 # left commented here on purpose |
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87 # |
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88 #def restore(self): |
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89 # """reinstall previous stdout and stderr and return intercepted stdout |
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90 # """ |
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91 # raise NotImplementedError() |
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92 |
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93 def decodevaluefromheaders(req, headerprefix): |
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94 """Decode a long value from multiple HTTP request headers. |
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95 |
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96 Returns the value as a bytes, not a str. |
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97 """ |
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98 chunks = [] |
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99 i = 1 |
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100 prefix = headerprefix.upper().replace(r'-', r'_') |
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101 while True: |
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102 v = req.env.get(r'HTTP_%s_%d' % (prefix, i)) |
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103 if v is None: |
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104 break |
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105 chunks.append(pycompat.bytesurl(v)) |
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106 i += 1 |
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107 |
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108 return ''.join(chunks) |
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109 |
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110 class webproto(baseprotocolhandler): |
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111 def __init__(self, req, ui): |
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112 self._req = req |
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113 self._ui = ui |
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114 |
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115 @property |
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116 def name(self): |
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117 return 'http' |
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118 |
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119 def getargs(self, args): |
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120 knownargs = self._args() |
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121 data = {} |
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122 keys = args.split() |
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123 for k in keys: |
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124 if k == '*': |
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125 star = {} |
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126 for key in knownargs.keys(): |
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127 if key != 'cmd' and key not in keys: |
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128 star[key] = knownargs[key][0] |
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129 data['*'] = star |
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130 else: |
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131 data[k] = knownargs[k][0] |
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132 return [data[k] for k in keys] |
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133 |
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134 def _args(self): |
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135 args = util.rapply(pycompat.bytesurl, self._req.form.copy()) |
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136 postlen = int(self._req.env.get(r'HTTP_X_HGARGS_POST', 0)) |
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137 if postlen: |
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138 args.update(cgi.parse_qs( |
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139 self._req.read(postlen), keep_blank_values=True)) |
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140 return args |
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141 |
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142 argvalue = decodevaluefromheaders(self._req, r'X-HgArg') |
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143 args.update(cgi.parse_qs(argvalue, keep_blank_values=True)) |
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144 return args |
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145 |
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146 def getfile(self, fp): |
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147 length = int(self._req.env[r'CONTENT_LENGTH']) |
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148 # If httppostargs is used, we need to read Content-Length |
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149 # minus the amount that was consumed by args. |
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150 length -= int(self._req.env.get(r'HTTP_X_HGARGS_POST', 0)) |
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151 for s in util.filechunkiter(self._req, limit=length): |
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152 fp.write(s) |
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153 |
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154 def redirect(self): |
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155 self._oldio = self._ui.fout, self._ui.ferr |
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156 self._ui.ferr = self._ui.fout = stringio() |
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157 |
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158 def restore(self): |
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159 val = self._ui.fout.getvalue() |
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160 self._ui.ferr, self._ui.fout = self._oldio |
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161 return val |
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162 |
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163 def _client(self): |
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164 return 'remote:%s:%s:%s' % ( |
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165 self._req.env.get('wsgi.url_scheme') or 'http', |
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166 urlreq.quote(self._req.env.get('REMOTE_HOST', '')), |
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167 urlreq.quote(self._req.env.get('REMOTE_USER', ''))) |
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168 |
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169 def responsetype(self, prefer_uncompressed): |
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170 """Determine the appropriate response type and compression settings. |
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171 |
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172 Returns a tuple of (mediatype, compengine, engineopts). |
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173 """ |
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174 # Determine the response media type and compression engine based |
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175 # on the request parameters. |
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176 protocaps = decodevaluefromheaders(self._req, r'X-HgProto').split(' ') |
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177 |
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178 if '0.2' in protocaps: |
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179 # All clients are expected to support uncompressed data. |
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180 if prefer_uncompressed: |
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181 return HGTYPE2, util._noopengine(), {} |
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182 |
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183 # Default as defined by wire protocol spec. |
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184 compformats = ['zlib', 'none'] |
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185 for cap in protocaps: |
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186 if cap.startswith('comp='): |
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187 compformats = cap[5:].split(',') |
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188 break |
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189 |
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190 # Now find an agreed upon compression format. |
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191 for engine in wireproto.supportedcompengines(self._ui, self, |
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192 util.SERVERROLE): |
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193 if engine.wireprotosupport().name in compformats: |
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194 opts = {} |
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195 level = self._ui.configint('server', |
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196 '%slevel' % engine.name()) |
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197 if level is not None: |
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198 opts['level'] = level |
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199 |
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200 return HGTYPE2, engine, opts |
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201 |
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202 # No mutually supported compression format. Fall back to the |
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203 # legacy protocol. |
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204 |
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205 # Don't allow untrusted settings because disabling compression or |
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206 # setting a very high compression level could lead to flooding |
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207 # the server's network or CPU. |
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208 opts = {'level': self._ui.configint('server', 'zliblevel')} |
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209 return HGTYPE, util.compengines['zlib'], opts |
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210 |
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211 def iscmd(cmd): |
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212 return cmd in wireproto.commands |
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213 |
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214 def parsehttprequest(repo, req, query): |
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215 """Parse the HTTP request for a wire protocol request. |
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216 |
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217 If the current request appears to be a wire protocol request, this |
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218 function returns a dict with details about that request, including |
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219 an ``abstractprotocolserver`` instance suitable for handling the |
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220 request. Otherwise, ``None`` is returned. |
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221 |
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222 ``req`` is a ``wsgirequest`` instance. |
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223 """ |
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224 # HTTP version 1 wire protocol requests are denoted by a "cmd" query |
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225 # string parameter. If it isn't present, this isn't a wire protocol |
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226 # request. |
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227 if r'cmd' not in req.form: |
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228 return None |
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229 |
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230 cmd = pycompat.sysbytes(req.form[r'cmd'][0]) |
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231 |
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232 # The "cmd" request parameter is used by both the wire protocol and hgweb. |
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233 # While not all wire protocol commands are available for all transports, |
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234 # if we see a "cmd" value that resembles a known wire protocol command, we |
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235 # route it to a protocol handler. This is better than routing possible |
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236 # wire protocol requests to hgweb because it prevents hgweb from using |
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237 # known wire protocol commands and it is less confusing for machine |
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238 # clients. |
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239 if cmd not in wireproto.commands: |
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240 return None |
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241 |
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242 proto = webproto(req, repo.ui) |
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243 |
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244 return { |
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245 'cmd': cmd, |
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246 'proto': proto, |
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247 'dispatch': lambda: _callhttp(repo, req, proto, cmd), |
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248 'handleerror': lambda ex: _handlehttperror(ex, req, cmd), |
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249 } |
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250 |
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251 def _callhttp(repo, req, proto, cmd): |
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252 def genversion2(gen, engine, engineopts): |
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253 # application/mercurial-0.2 always sends a payload header |
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254 # identifying the compression engine. |
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255 name = engine.wireprotosupport().name |
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256 assert 0 < len(name) < 256 |
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257 yield struct.pack('B', len(name)) |
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258 yield name |
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259 |
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260 for chunk in gen: |
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261 yield chunk |
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262 |
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263 rsp = wireproto.dispatch(repo, proto, cmd) |
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264 |
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265 if not wireproto.commands.commandavailable(cmd, proto): |
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266 req.respond(HTTP_OK, HGERRTYPE, |
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267 body=_('requested wire protocol command is not available ' |
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268 'over HTTP')) |
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269 return [] |
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270 |
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271 if isinstance(rsp, bytes): |
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272 req.respond(HTTP_OK, HGTYPE, body=rsp) |
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273 return [] |
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274 elif isinstance(rsp, wireproto.streamres_legacy): |
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275 gen = rsp.gen |
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276 req.respond(HTTP_OK, HGTYPE) |
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277 return gen |
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278 elif isinstance(rsp, wireproto.streamres): |
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279 gen = rsp.gen |
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280 |
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281 # This code for compression should not be streamres specific. It |
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282 # is here because we only compress streamres at the moment. |
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283 mediatype, engine, engineopts = proto.responsetype( |
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284 rsp.prefer_uncompressed) |
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285 gen = engine.compressstream(gen, engineopts) |
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286 |
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287 if mediatype == HGTYPE2: |
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288 gen = genversion2(gen, engine, engineopts) |
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289 |
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290 req.respond(HTTP_OK, mediatype) |
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291 return gen |
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292 elif isinstance(rsp, wireproto.pushres): |
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293 val = proto.restore() |
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294 rsp = '%d\n%s' % (rsp.res, val) |
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295 req.respond(HTTP_OK, HGTYPE, body=rsp) |
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296 return [] |
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297 elif isinstance(rsp, wireproto.pusherr): |
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298 # This is the httplib workaround documented in _handlehttperror(). |
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299 req.drain() |
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300 |
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301 proto.restore() |
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302 rsp = '0\n%s\n' % rsp.res |
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303 req.respond(HTTP_OK, HGTYPE, body=rsp) |
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304 return [] |
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305 elif isinstance(rsp, wireproto.ooberror): |
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306 rsp = rsp.message |
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307 req.respond(HTTP_OK, HGERRTYPE, body=rsp) |
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308 return [] |
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309 raise error.ProgrammingError('hgweb.protocol internal failure', rsp) |
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310 |
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311 def _handlehttperror(e, req, cmd): |
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312 """Called when an ErrorResponse is raised during HTTP request processing.""" |
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313 |
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314 # Clients using Python's httplib are stateful: the HTTP client |
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315 # won't process an HTTP response until all request data is |
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316 # sent to the server. The intent of this code is to ensure |
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317 # we always read HTTP request data from the client, thus |
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318 # ensuring httplib transitions to a state that allows it to read |
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319 # the HTTP response. In other words, it helps prevent deadlocks |
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320 # on clients using httplib. |
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321 |
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322 if (req.env[r'REQUEST_METHOD'] == r'POST' and |
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323 # But not if Expect: 100-continue is being used. |
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324 (req.env.get('HTTP_EXPECT', |
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325 '').lower() != '100-continue') or |
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326 # Or the non-httplib HTTP library is being advertised by |
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327 # the client. |
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328 req.env.get('X-HgHttp2', '')): |
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329 req.drain() |
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330 else: |
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331 req.headers.append((r'Connection', r'Close')) |
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332 |
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333 # TODO This response body assumes the failed command was |
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334 # "unbundle." That assumption is not always valid. |
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335 req.respond(e, HGTYPE, body='0\n%s\n' % e) |
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336 |
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337 return '' |
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338 |
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339 class sshserver(baseprotocolhandler): |
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340 def __init__(self, ui, repo): |
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341 self._ui = ui |
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342 self._repo = repo |
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343 self._fin = ui.fin |
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344 self._fout = ui.fout |
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345 |
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346 hook.redirect(True) |
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347 ui.fout = repo.ui.fout = ui.ferr |
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348 |
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349 # Prevent insertion/deletion of CRs |
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350 util.setbinary(self._fin) |
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351 util.setbinary(self._fout) |
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352 |
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353 @property |
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354 def name(self): |
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355 return 'ssh' |
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356 |
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357 def getargs(self, args): |
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358 data = {} |
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359 keys = args.split() |
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360 for n in xrange(len(keys)): |
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361 argline = self._fin.readline()[:-1] |
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362 arg, l = argline.split() |
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363 if arg not in keys: |
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364 raise error.Abort(_("unexpected parameter %r") % arg) |
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365 if arg == '*': |
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366 star = {} |
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367 for k in xrange(int(l)): |
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368 argline = self._fin.readline()[:-1] |
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369 arg, l = argline.split() |
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370 val = self._fin.read(int(l)) |
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371 star[arg] = val |
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372 data['*'] = star |
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373 else: |
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374 val = self._fin.read(int(l)) |
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375 data[arg] = val |
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376 return [data[k] for k in keys] |
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377 |
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378 def getfile(self, fpout): |
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379 self._sendresponse('') |
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380 count = int(self._fin.readline()) |
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381 while count: |
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382 fpout.write(self._fin.read(count)) |
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383 count = int(self._fin.readline()) |
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384 |
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385 def redirect(self): |
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386 pass |
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387 |
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388 def _sendresponse(self, v): |
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389 self._fout.write("%d\n" % len(v)) |
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390 self._fout.write(v) |
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391 self._fout.flush() |
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392 |
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393 def _sendstream(self, source): |
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394 write = self._fout.write |
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395 for chunk in source.gen: |
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396 write(chunk) |
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397 self._fout.flush() |
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398 |
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399 def _sendpushresponse(self, rsp): |
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400 self._sendresponse('') |
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401 self._sendresponse(str(rsp.res)) |
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402 |
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403 def _sendpusherror(self, rsp): |
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404 self._sendresponse(rsp.res) |
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405 |
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406 def _sendooberror(self, rsp): |
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407 self._ui.ferr.write('%s\n-\n' % rsp.message) |
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408 self._ui.ferr.flush() |
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409 self._fout.write('\n') |
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410 self._fout.flush() |
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411 |
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412 def serve_forever(self): |
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413 while self.serve_one(): |
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414 pass |
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415 sys.exit(0) |
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416 |
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417 _handlers = { |
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418 str: _sendresponse, |
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419 wireproto.streamres: _sendstream, |
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420 wireproto.streamres_legacy: _sendstream, |
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421 wireproto.pushres: _sendpushresponse, |
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422 wireproto.pusherr: _sendpusherror, |
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423 wireproto.ooberror: _sendooberror, |
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424 } |
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425 |
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426 def serve_one(self): |
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427 cmd = self._fin.readline()[:-1] |
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428 if cmd and wireproto.commands.commandavailable(cmd, self): |
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429 rsp = wireproto.dispatch(self._repo, self, cmd) |
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430 self._handlers[rsp.__class__](self, rsp) |
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431 elif cmd: |
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432 self._sendresponse("") |
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433 return cmd != '' |
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434 |
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435 def _client(self): |
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436 client = encoding.environ.get('SSH_CLIENT', '').split(' ', 1)[0] |
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437 return 'remote:ssh:' + client |