Mercurial > hg
annotate mercurial/wireprotov2peer.py @ 39534:fd9029d36c41
ancestor: return early from _lazyancestorsiter() when reached to stoprev
There's no need to empty the heap.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Mon, 10 Sep 2018 21:46:19 +0900 |
parents | 43d92d68ac88 |
children | 07b58266bce3 |
rev | line source |
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1 # wireprotov2peer.py - client side code for wire protocol version 2 |
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2 # |
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3 # Copyright 2018 Gregory Szorc <gregory.szorc@gmail.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 from .i18n import _ |
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11 from . import ( |
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12 encoding, |
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13 error, |
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14 util, |
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15 wireprotoframing, |
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16 ) |
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17 from .utils import ( |
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18 cborutil, |
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19 ) |
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20 |
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21 def formatrichmessage(atoms): |
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22 """Format an encoded message from the framing protocol.""" |
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23 |
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24 chunks = [] |
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25 |
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26 for atom in atoms: |
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27 msg = _(atom[b'msg']) |
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28 |
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29 if b'args' in atom: |
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30 msg = msg % tuple(atom[b'args']) |
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31 |
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32 chunks.append(msg) |
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33 |
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34 return b''.join(chunks) |
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35 |
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36 class commandresponse(object): |
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37 """Represents the response to a command request.""" |
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38 |
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39 def __init__(self, requestid, command): |
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40 self.requestid = requestid |
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41 self.command = command |
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42 |
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43 self.b = util.bytesio() |
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44 |
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45 def cborobjects(self): |
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46 """Obtain decoded CBOR objects from this response.""" |
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47 self.b.seek(0) |
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48 |
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49 for v in cborutil.decodeall(self.b.getvalue()): |
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50 yield v |
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51 |
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52 class clienthandler(object): |
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53 """Object to handle higher-level client activities. |
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54 |
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55 The ``clientreactor`` is used to hold low-level state about the frame-based |
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56 protocol, such as which requests and streams are active. This type is used |
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57 for higher-level operations, such as reading frames from a socket, exposing |
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58 and managing a higher-level primitive for representing command responses, |
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59 etc. This class is what peers should probably use to bridge wire activity |
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60 with the higher-level peer API. |
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61 """ |
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62 |
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63 def __init__(self, ui, clientreactor): |
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64 self._ui = ui |
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65 self._reactor = clientreactor |
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66 self._requests = {} |
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67 self._futures = {} |
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68 self._responses = {} |
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69 |
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70 def callcommand(self, command, args, f): |
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71 """Register a request to call a command. |
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72 |
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73 Returns an iterable of frames that should be sent over the wire. |
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74 """ |
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75 request, action, meta = self._reactor.callcommand(command, args) |
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76 |
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77 if action != 'noop': |
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78 raise error.ProgrammingError('%s not yet supported' % action) |
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79 |
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80 rid = request.requestid |
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81 self._requests[rid] = request |
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82 self._futures[rid] = f |
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83 self._responses[rid] = commandresponse(rid, command) |
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84 |
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85 return iter(()) |
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86 |
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87 def flushcommands(self): |
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88 """Flush all queued commands. |
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89 |
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90 Returns an iterable of frames that should be sent over the wire. |
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91 """ |
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92 action, meta = self._reactor.flushcommands() |
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93 |
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94 if action != 'sendframes': |
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95 raise error.ProgrammingError('%s not yet supported' % action) |
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96 |
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97 return meta['framegen'] |
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98 |
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99 def readframe(self, fh): |
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100 """Attempt to read and process a frame. |
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101 |
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102 Returns None if no frame was read. Presumably this means EOF. |
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103 """ |
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104 frame = wireprotoframing.readframe(fh) |
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105 if frame is None: |
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106 # TODO tell reactor? |
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107 return |
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108 |
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109 self._ui.note(_('received %r\n') % frame) |
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110 self._processframe(frame) |
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111 |
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112 return True |
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113 |
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114 def _processframe(self, frame): |
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115 """Process a single read frame.""" |
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116 |
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117 action, meta = self._reactor.onframerecv(frame) |
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118 |
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119 if action == 'error': |
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120 e = error.RepoError(meta['message']) |
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121 |
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122 if frame.requestid in self._futures: |
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123 self._futures[frame.requestid].set_exception(e) |
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124 else: |
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125 raise e |
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126 |
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127 if frame.requestid not in self._requests: |
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128 raise error.ProgrammingError( |
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129 'received frame for unknown request; this is either a bug in ' |
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130 'the clientreactor not screening for this or this instance was ' |
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131 'never told about this request: %r' % frame) |
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132 |
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133 response = self._responses[frame.requestid] |
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134 |
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135 if action == 'responsedata': |
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136 # Any failures processing this frame should bubble up to the |
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137 # future tracking the request. |
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138 try: |
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139 self._processresponsedata(frame, meta, response) |
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140 except BaseException as e: |
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141 self._futures[frame.requestid].set_exception(e) |
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142 else: |
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143 raise error.ProgrammingError( |
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144 'unhandled action from clientreactor: %s' % action) |
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145 |
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146 def _processresponsedata(self, frame, meta, response): |
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147 # This buffers all data until end of stream is received. This |
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148 # is bad for performance. |
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149 # TODO make response data streamable |
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150 response.b.write(meta['data']) |
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151 |
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152 if meta['eos']: |
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153 # If the command has a decoder, resolve the future to the |
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154 # decoded value. Otherwise resolve to the rich response object. |
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155 decoder = COMMAND_DECODERS.get(response.command) |
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156 |
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157 # TODO consider always resolving the overall status map. |
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158 if decoder: |
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159 objs = response.cborobjects() |
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160 |
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161 overall = next(objs) |
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162 |
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163 if overall['status'] == 'ok': |
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164 self._futures[frame.requestid].set_result(decoder(objs)) |
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165 else: |
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166 atoms = [{'msg': overall['error']['message']}] |
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167 if 'args' in overall['error']: |
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168 atoms[0]['args'] = overall['error']['args'] |
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169 e = error.RepoError(formatrichmessage(atoms)) |
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170 self._futures[frame.requestid].set_exception(e) |
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171 else: |
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172 self._futures[frame.requestid].set_result(response) |
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173 |
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174 del self._requests[frame.requestid] |
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175 del self._futures[frame.requestid] |
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176 |
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177 def decodebranchmap(objs): |
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178 # Response should be a single CBOR map of branch name to array of nodes. |
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179 bm = next(objs) |
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180 |
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181 return {encoding.tolocal(k): v for k, v in bm.items()} |
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182 |
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183 def decodeheads(objs): |
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184 # Array of node bytestrings. |
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185 return next(objs) |
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186 |
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187 def decodeknown(objs): |
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188 # Bytestring where each byte is a 0 or 1. |
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189 raw = next(objs) |
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190 |
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191 return [True if c == '1' else False for c in raw] |
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192 |
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193 def decodelistkeys(objs): |
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194 # Map with bytestring keys and values. |
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195 return next(objs) |
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196 |
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197 def decodelookup(objs): |
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198 return next(objs) |
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199 |
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200 def decodepushkey(objs): |
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201 return next(objs) |
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202 |
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203 COMMAND_DECODERS = { |
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204 'branchmap': decodebranchmap, |
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205 'heads': decodeheads, |
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206 'known': decodeknown, |
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207 'listkeys': decodelistkeys, |
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208 'lookup': decodelookup, |
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209 'pushkey': decodepushkey, |
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210 } |