Mercurial > hg
annotate mercurial/wireprotov2server.py @ 39152:3b1042cab4b4
revlog: add a method to retrieve snapshot depth
Some snapshot property (eg: maximum size) will depend on their depth.
author | Boris Feld <boris.feld@octobus.net> |
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date | Wed, 15 Aug 2018 12:09:14 +0200 |
parents | 856f381ad74b |
children | 660879e49b46 |
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 contextlib |
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10 |
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11 from .i18n import _ |
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12 from .thirdparty import ( |
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13 cbor, |
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14 ) |
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15 from . import ( |
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16 encoding, |
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17 error, |
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18 pycompat, |
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19 streamclone, |
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20 util, |
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21 wireprotoframing, |
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22 wireprototypes, |
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23 ) |
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24 from .utils import ( |
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25 interfaceutil, |
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26 ) |
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27 |
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28 FRAMINGTYPE = b'application/mercurial-exp-framing-0005' |
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29 |
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30 HTTP_WIREPROTO_V2 = wireprototypes.HTTP_WIREPROTO_V2 |
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31 |
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32 COMMANDS = wireprototypes.commanddict() |
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33 |
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34 def handlehttpv2request(rctx, req, res, checkperm, urlparts): |
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35 from .hgweb import common as hgwebcommon |
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36 |
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37 # URL space looks like: <permissions>/<command>, where <permission> can |
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38 # be ``ro`` or ``rw`` to signal read-only or read-write, respectively. |
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39 |
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40 # Root URL does nothing meaningful... yet. |
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41 if not urlparts: |
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42 res.status = b'200 OK' |
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43 res.headers[b'Content-Type'] = b'text/plain' |
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44 res.setbodybytes(_('HTTP version 2 API handler')) |
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45 return |
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46 |
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47 if len(urlparts) == 1: |
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48 res.status = b'404 Not Found' |
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49 res.headers[b'Content-Type'] = b'text/plain' |
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50 res.setbodybytes(_('do not know how to process %s\n') % |
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51 req.dispatchpath) |
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52 return |
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53 |
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54 permission, command = urlparts[0:2] |
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55 |
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56 if permission not in (b'ro', b'rw'): |
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57 res.status = b'404 Not Found' |
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58 res.headers[b'Content-Type'] = b'text/plain' |
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59 res.setbodybytes(_('unknown permission: %s') % permission) |
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60 return |
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61 |
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62 if req.method != 'POST': |
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63 res.status = b'405 Method Not Allowed' |
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64 res.headers[b'Allow'] = b'POST' |
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65 res.setbodybytes(_('commands require POST requests')) |
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66 return |
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67 |
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68 # At some point we'll want to use our own API instead of recycling the |
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69 # behavior of version 1 of the wire protocol... |
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70 # TODO return reasonable responses - not responses that overload the |
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71 # HTTP status line message for error reporting. |
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72 try: |
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73 checkperm(rctx, req, 'pull' if permission == b'ro' else 'push') |
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74 except hgwebcommon.ErrorResponse as e: |
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75 res.status = hgwebcommon.statusmessage(e.code, pycompat.bytestr(e)) |
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76 for k, v in e.headers: |
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77 res.headers[k] = v |
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78 res.setbodybytes('permission denied') |
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79 return |
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80 |
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81 # We have a special endpoint to reflect the request back at the client. |
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82 if command == b'debugreflect': |
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83 _processhttpv2reflectrequest(rctx.repo.ui, rctx.repo, req, res) |
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84 return |
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85 |
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86 # Extra commands that we handle that aren't really wire protocol |
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87 # commands. Think extra hard before making this hackery available to |
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88 # extension. |
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89 extracommands = {'multirequest'} |
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90 |
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91 if command not in COMMANDS and command not in extracommands: |
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92 res.status = b'404 Not Found' |
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93 res.headers[b'Content-Type'] = b'text/plain' |
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94 res.setbodybytes(_('unknown wire protocol command: %s\n') % command) |
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95 return |
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96 |
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97 repo = rctx.repo |
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98 ui = repo.ui |
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99 |
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100 proto = httpv2protocolhandler(req, ui) |
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101 |
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102 if (not COMMANDS.commandavailable(command, proto) |
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103 and command not in extracommands): |
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104 res.status = b'404 Not Found' |
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105 res.headers[b'Content-Type'] = b'text/plain' |
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106 res.setbodybytes(_('invalid wire protocol command: %s') % command) |
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107 return |
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108 |
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109 # TODO consider cases where proxies may add additional Accept headers. |
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110 if req.headers.get(b'Accept') != FRAMINGTYPE: |
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111 res.status = b'406 Not Acceptable' |
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112 res.headers[b'Content-Type'] = b'text/plain' |
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113 res.setbodybytes(_('client MUST specify Accept header with value: %s\n') |
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114 % FRAMINGTYPE) |
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115 return |
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116 |
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117 if req.headers.get(b'Content-Type') != FRAMINGTYPE: |
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118 res.status = b'415 Unsupported Media Type' |
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119 # TODO we should send a response with appropriate media type, |
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120 # since client does Accept it. |
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121 res.headers[b'Content-Type'] = b'text/plain' |
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122 res.setbodybytes(_('client MUST send Content-Type header with ' |
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123 'value: %s\n') % FRAMINGTYPE) |
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124 return |
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125 |
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126 _processhttpv2request(ui, repo, req, res, permission, command, proto) |
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127 |
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128 def _processhttpv2reflectrequest(ui, repo, req, res): |
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129 """Reads unified frame protocol request and dumps out state to client. |
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130 |
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131 This special endpoint can be used to help debug the wire protocol. |
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132 |
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133 Instead of routing the request through the normal dispatch mechanism, |
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134 we instead read all frames, decode them, and feed them into our state |
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135 tracker. We then dump the log of all that activity back out to the |
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136 client. |
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137 """ |
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138 import json |
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139 |
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140 # Reflection APIs have a history of being abused, accidentally disclosing |
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141 # sensitive data, etc. So we have a config knob. |
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142 if not ui.configbool('experimental', 'web.api.debugreflect'): |
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143 res.status = b'404 Not Found' |
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144 res.headers[b'Content-Type'] = b'text/plain' |
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145 res.setbodybytes(_('debugreflect service not available')) |
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146 return |
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147 |
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148 # We assume we have a unified framing protocol request body. |
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149 |
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150 reactor = wireprotoframing.serverreactor() |
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151 states = [] |
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152 |
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153 while True: |
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154 frame = wireprotoframing.readframe(req.bodyfh) |
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155 |
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156 if not frame: |
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157 states.append(b'received: <no frame>') |
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158 break |
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159 |
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160 states.append(b'received: %d %d %d %s' % (frame.typeid, frame.flags, |
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161 frame.requestid, |
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162 frame.payload)) |
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163 |
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164 action, meta = reactor.onframerecv(frame) |
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165 states.append(json.dumps((action, meta), sort_keys=True, |
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166 separators=(', ', ': '))) |
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167 |
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168 action, meta = reactor.oninputeof() |
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169 meta['action'] = action |
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170 states.append(json.dumps(meta, sort_keys=True, separators=(', ',': '))) |
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171 |
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172 res.status = b'200 OK' |
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173 res.headers[b'Content-Type'] = b'text/plain' |
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174 res.setbodybytes(b'\n'.join(states)) |
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175 |
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176 def _processhttpv2request(ui, repo, req, res, authedperm, reqcommand, proto): |
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177 """Post-validation handler for HTTPv2 requests. |
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178 |
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179 Called when the HTTP request contains unified frame-based protocol |
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180 frames for evaluation. |
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181 """ |
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182 # TODO Some HTTP clients are full duplex and can receive data before |
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183 # the entire request is transmitted. Figure out a way to indicate support |
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184 # for that so we can opt into full duplex mode. |
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185 reactor = wireprotoframing.serverreactor(deferoutput=True) |
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186 seencommand = False |
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187 |
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188 outstream = reactor.makeoutputstream() |
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189 |
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190 while True: |
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191 frame = wireprotoframing.readframe(req.bodyfh) |
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192 if not frame: |
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193 break |
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194 |
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195 action, meta = reactor.onframerecv(frame) |
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196 |
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197 if action == 'wantframe': |
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198 # Need more data before we can do anything. |
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199 continue |
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200 elif action == 'runcommand': |
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201 sentoutput = _httpv2runcommand(ui, repo, req, res, authedperm, |
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202 reqcommand, reactor, outstream, |
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203 meta, issubsequent=seencommand) |
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204 |
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205 if sentoutput: |
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206 return |
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207 |
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208 seencommand = True |
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209 |
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210 elif action == 'error': |
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211 # TODO define proper error mechanism. |
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212 res.status = b'200 OK' |
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213 res.headers[b'Content-Type'] = b'text/plain' |
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214 res.setbodybytes(meta['message'] + b'\n') |
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215 return |
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216 else: |
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217 raise error.ProgrammingError( |
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218 'unhandled action from frame processor: %s' % action) |
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219 |
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220 action, meta = reactor.oninputeof() |
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221 if action == 'sendframes': |
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222 # We assume we haven't started sending the response yet. If we're |
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223 # wrong, the response type will raise an exception. |
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224 res.status = b'200 OK' |
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225 res.headers[b'Content-Type'] = FRAMINGTYPE |
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226 res.setbodygen(meta['framegen']) |
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227 elif action == 'noop': |
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228 pass |
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229 else: |
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230 raise error.ProgrammingError('unhandled action from frame processor: %s' |
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231 % action) |
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232 |
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233 def _httpv2runcommand(ui, repo, req, res, authedperm, reqcommand, reactor, |
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234 outstream, command, issubsequent): |
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235 """Dispatch a wire protocol command made from HTTPv2 requests. |
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236 |
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237 The authenticated permission (``authedperm``) along with the original |
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238 command from the URL (``reqcommand``) are passed in. |
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239 """ |
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240 # We already validated that the session has permissions to perform the |
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241 # actions in ``authedperm``. In the unified frame protocol, the canonical |
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242 # command to run is expressed in a frame. However, the URL also requested |
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243 # to run a specific command. We need to be careful that the command we |
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244 # run doesn't have permissions requirements greater than what was granted |
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245 # by ``authedperm``. |
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246 # |
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247 # Our rule for this is we only allow one command per HTTP request and |
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248 # that command must match the command in the URL. However, we make |
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249 # an exception for the ``multirequest`` URL. This URL is allowed to |
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250 # execute multiple commands. We double check permissions of each command |
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251 # as it is invoked to ensure there is no privilege escalation. |
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252 # TODO consider allowing multiple commands to regular command URLs |
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253 # iff each command is the same. |
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254 |
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255 proto = httpv2protocolhandler(req, ui, args=command['args']) |
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256 |
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257 if reqcommand == b'multirequest': |
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258 if not COMMANDS.commandavailable(command['command'], proto): |
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259 # TODO proper error mechanism |
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260 res.status = b'200 OK' |
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261 res.headers[b'Content-Type'] = b'text/plain' |
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262 res.setbodybytes(_('wire protocol command not available: %s') % |
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263 command['command']) |
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264 return True |
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265 |
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266 # TODO don't use assert here, since it may be elided by -O. |
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267 assert authedperm in (b'ro', b'rw') |
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268 wirecommand = COMMANDS[command['command']] |
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269 assert wirecommand.permission in ('push', 'pull') |
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270 |
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271 if authedperm == b'ro' and wirecommand.permission != 'pull': |
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272 # TODO proper error mechanism |
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273 res.status = b'403 Forbidden' |
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274 res.headers[b'Content-Type'] = b'text/plain' |
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275 res.setbodybytes(_('insufficient permissions to execute ' |
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276 'command: %s') % command['command']) |
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277 return True |
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278 |
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279 # TODO should we also call checkperm() here? Maybe not if we're going |
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280 # to overhaul that API. The granted scope from the URL check should |
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281 # be good enough. |
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282 |
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283 else: |
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284 # Don't allow multiple commands outside of ``multirequest`` URL. |
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285 if issubsequent: |
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286 # TODO proper error mechanism |
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287 res.status = b'200 OK' |
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288 res.headers[b'Content-Type'] = b'text/plain' |
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289 res.setbodybytes(_('multiple commands cannot be issued to this ' |
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290 'URL')) |
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291 return True |
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292 |
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293 if reqcommand != command['command']: |
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294 # TODO define proper error mechanism |
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295 res.status = b'200 OK' |
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296 res.headers[b'Content-Type'] = b'text/plain' |
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297 res.setbodybytes(_('command in frame must match command in URL')) |
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298 return True |
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299 |
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300 rsp = dispatch(repo, proto, command['command']) |
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301 |
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302 res.status = b'200 OK' |
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303 res.headers[b'Content-Type'] = FRAMINGTYPE |
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304 |
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305 if isinstance(rsp, wireprototypes.cborresponse): |
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306 encoded = cbor.dumps(rsp.value, canonical=True) |
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307 action, meta = reactor.oncommandresponseready(outstream, |
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308 command['requestid'], |
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309 encoded) |
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310 elif isinstance(rsp, wireprototypes.v2streamingresponse): |
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311 action, meta = reactor.oncommandresponsereadygen(outstream, |
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312 command['requestid'], |
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313 rsp.gen) |
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314 elif isinstance(rsp, wireprototypes.v2errorresponse): |
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315 action, meta = reactor.oncommanderror(outstream, |
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316 command['requestid'], |
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317 rsp.message, |
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318 rsp.args) |
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319 else: |
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320 action, meta = reactor.onservererror( |
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321 _('unhandled response type from wire proto command')) |
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322 |
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323 if action == 'sendframes': |
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324 res.setbodygen(meta['framegen']) |
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325 return True |
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326 elif action == 'noop': |
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327 return False |
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328 else: |
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329 raise error.ProgrammingError('unhandled event from reactor: %s' % |
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330 action) |
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331 |
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332 def getdispatchrepo(repo, proto, command): |
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333 return repo.filtered('served') |
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334 |
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335 def dispatch(repo, proto, command): |
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336 repo = getdispatchrepo(repo, proto, command) |
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337 |
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338 func, spec = COMMANDS[command] |
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339 args = proto.getargs(spec) |
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340 |
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341 return func(repo, proto, **args) |
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342 |
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343 @interfaceutil.implementer(wireprototypes.baseprotocolhandler) |
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344 class httpv2protocolhandler(object): |
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345 def __init__(self, req, ui, args=None): |
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346 self._req = req |
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347 self._ui = ui |
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348 self._args = args |
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349 |
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350 @property |
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351 def name(self): |
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352 return HTTP_WIREPROTO_V2 |
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353 |
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354 def getargs(self, args): |
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355 data = {} |
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356 for k, typ in args.items(): |
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357 if k == '*': |
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358 raise NotImplementedError('do not support * args') |
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359 elif k in self._args: |
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360 # TODO consider validating value types. |
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361 data[k] = self._args[k] |
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362 |
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363 return data |
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364 |
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365 def getprotocaps(self): |
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366 # Protocol capabilities are currently not implemented for HTTP V2. |
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367 return set() |
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368 |
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369 def getpayload(self): |
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370 raise NotImplementedError |
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371 |
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372 @contextlib.contextmanager |
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373 def mayberedirectstdio(self): |
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374 raise NotImplementedError |
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375 |
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376 def client(self): |
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377 raise NotImplementedError |
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378 |
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379 def addcapabilities(self, repo, caps): |
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380 return caps |
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381 |
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382 def checkperm(self, perm): |
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383 raise NotImplementedError |
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384 |
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385 def httpv2apidescriptor(req, repo): |
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386 proto = httpv2protocolhandler(req, repo.ui) |
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387 |
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388 return _capabilitiesv2(repo, proto) |
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389 |
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390 def _capabilitiesv2(repo, proto): |
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391 """Obtain the set of capabilities for version 2 transports. |
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392 |
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393 These capabilities are distinct from the capabilities for version 1 |
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394 transports. |
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395 """ |
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396 compression = [] |
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397 for engine in wireprototypes.supportedcompengines(repo.ui, util.SERVERROLE): |
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398 compression.append({ |
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399 b'name': engine.wireprotosupport().name, |
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400 }) |
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401 |
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402 caps = { |
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403 'commands': {}, |
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404 'compression': compression, |
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405 'framingmediatypes': [FRAMINGTYPE], |
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406 } |
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407 |
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408 for command, entry in COMMANDS.items(): |
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409 caps['commands'][command] = { |
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410 'args': entry.args, |
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411 'permissions': [entry.permission], |
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412 } |
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413 |
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414 if streamclone.allowservergeneration(repo): |
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415 caps['rawrepoformats'] = sorted(repo.requirements & |
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416 repo.supportedformats) |
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417 |
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418 return proto.addcapabilities(repo, caps) |
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419 |
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420 def wireprotocommand(name, args=None, permission='push'): |
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421 """Decorator to declare a wire protocol command. |
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422 |
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423 ``name`` is the name of the wire protocol command being provided. |
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424 |
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425 ``args`` is a dict of argument names to example values. |
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426 |
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427 ``permission`` defines the permission type needed to run this command. |
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428 Can be ``push`` or ``pull``. These roughly map to read-write and read-only, |
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429 respectively. Default is to assume command requires ``push`` permissions |
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430 because otherwise commands not declaring their permissions could modify |
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431 a repository that is supposed to be read-only. |
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432 """ |
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433 transports = {k for k, v in wireprototypes.TRANSPORTS.items() |
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434 if v['version'] == 2} |
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435 |
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436 if permission not in ('push', 'pull'): |
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437 raise error.ProgrammingError('invalid wire protocol permission; ' |
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438 'got %s; expected "push" or "pull"' % |
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439 permission) |
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440 |
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441 if args is None: |
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442 args = {} |
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443 |
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444 if not isinstance(args, dict): |
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445 raise error.ProgrammingError('arguments for version 2 commands ' |
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446 'must be declared as dicts') |
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447 |
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448 def register(func): |
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449 if name in COMMANDS: |
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450 raise error.ProgrammingError('%s command already registered ' |
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451 'for version 2' % name) |
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452 |
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453 COMMANDS[name] = wireprototypes.commandentry( |
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454 func, args=args, transports=transports, permission=permission) |
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455 |
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456 return func |
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457 |
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458 return register |
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459 |
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460 @wireprotocommand('branchmap', permission='pull') |
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461 def branchmapv2(repo, proto): |
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462 branchmap = {encoding.fromlocal(k): v |
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463 for k, v in repo.branchmap().iteritems()} |
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464 |
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465 return wireprototypes.cborresponse(branchmap) |
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466 |
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467 @wireprotocommand('capabilities', permission='pull') |
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468 def capabilitiesv2(repo, proto): |
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469 caps = _capabilitiesv2(repo, proto) |
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470 |
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471 return wireprototypes.cborresponse(caps) |
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472 |
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473 @wireprotocommand('heads', |
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474 args={ |
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475 'publiconly': False, |
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476 }, |
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477 permission='pull') |
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478 def headsv2(repo, proto, publiconly=False): |
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479 if publiconly: |
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480 repo = repo.filtered('immutable') |
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481 |
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482 return wireprototypes.cborresponse(repo.heads()) |
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483 |
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484 @wireprotocommand('known', |
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485 args={ |
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486 'nodes': [b'deadbeef'], |
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487 }, |
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488 permission='pull') |
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489 def knownv2(repo, proto, nodes=None): |
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490 nodes = nodes or [] |
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491 result = b''.join(b'1' if n else b'0' for n in repo.known(nodes)) |
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492 return wireprototypes.cborresponse(result) |
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493 |
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494 @wireprotocommand('listkeys', |
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495 args={ |
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496 'namespace': b'ns', |
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497 }, |
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498 permission='pull') |
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499 def listkeysv2(repo, proto, namespace=None): |
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500 keys = repo.listkeys(encoding.tolocal(namespace)) |
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501 keys = {encoding.fromlocal(k): encoding.fromlocal(v) |
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502 for k, v in keys.iteritems()} |
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503 |
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504 return wireprototypes.cborresponse(keys) |
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505 |
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506 @wireprotocommand('lookup', |
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507 args={ |
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508 'key': b'foo', |
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509 }, |
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510 permission='pull') |
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511 def lookupv2(repo, proto, key): |
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512 key = encoding.tolocal(key) |
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513 |
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514 # TODO handle exception. |
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515 node = repo.lookup(key) |
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516 |
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517 return wireprototypes.cborresponse(node) |
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518 |
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519 @wireprotocommand('pushkey', |
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520 args={ |
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521 'namespace': b'ns', |
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522 'key': b'key', |
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523 'old': b'old', |
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524 'new': b'new', |
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525 }, |
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526 permission='push') |
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527 def pushkeyv2(repo, proto, namespace, key, old, new): |
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528 # TODO handle ui output redirection |
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529 r = repo.pushkey(encoding.tolocal(namespace), |
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530 encoding.tolocal(key), |
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531 encoding.tolocal(old), |
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532 encoding.tolocal(new)) |
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533 |
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534 return wireprototypes.cborresponse(r) |