Mercurial > hg
annotate mercurial/httpclient/_readers.py @ 27432:77d25b913f80
changegroup: introduce cg3, which has support for exchanging treemanifests
I'm not entirely happy with using a trailing / on a "file" entry for
transferring a treemanifest. We've discussed putting some flags on
each file header[0], but I'm unconvinced that's actually any better:
if we were going to add another feature to the cg format we'd still be
doing a version bump anyway to cg4, so I'm inclined to not spend time
coming up with a more sophisticated format until we actually know what
the next feature we want to stuff in a changegroup will be.
Test changes outside test-treemanifest.t are only due to the new CG3
bundlecap showing up in the wire protocol.
Many thanks to adgar@google.com and martinvonz@google.com for helping
me with various odd corners of the changegroup and treemanifest API.
0: It's not hard refactoring, nor is it a lot of work. I'm just
disinclined to do speculative work when it's not clear what the
customer would actually be.
author | Augie Fackler <augie@google.com> |
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date | Fri, 11 Dec 2015 11:23:49 -0500 |
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1 # Copyright 2011, Google Inc. |
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2 # All rights reserved. |
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3 # |
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4 # Redistribution and use in source and binary forms, with or without |
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5 # modification, are permitted provided that the following conditions are |
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6 # met: |
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7 # |
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8 # * Redistributions of source code must retain the above copyright |
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9 # notice, this list of conditions and the following disclaimer. |
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10 # * Redistributions in binary form must reproduce the above |
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11 # copyright notice, this list of conditions and the following disclaimer |
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12 # in the documentation and/or other materials provided with the |
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13 # distribution. |
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14 # * Neither the name of Google Inc. nor the names of its |
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15 # contributors may be used to endorse or promote products derived from |
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16 # this software without specific prior written permission. |
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17 |
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18 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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19 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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20 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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21 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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22 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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23 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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24 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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25 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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26 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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27 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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28 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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29 """Reader objects to abstract out different body response types. |
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30 |
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31 This module is package-private. It is not expected that these will |
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32 have any clients outside of httpplus. |
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33 """ |
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34 |
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35 import httplib |
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36 import logging |
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37 |
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38 logger = logging.getLogger(__name__) |
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39 |
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40 |
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41 class ReadNotReady(Exception): |
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42 """Raised when read() is attempted but not enough data is loaded.""" |
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43 |
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44 |
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45 class HTTPRemoteClosedError(httplib.HTTPException): |
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46 """The server closed the remote socket in the middle of a response.""" |
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47 |
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48 |
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49 class AbstractReader(object): |
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50 """Abstract base class for response readers. |
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51 |
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52 Subclasses must implement _load, and should implement _close if |
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53 it's not an error for the server to close their socket without |
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54 some termination condition being detected during _load. |
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55 """ |
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56 def __init__(self): |
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57 self._finished = False |
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58 self._done_chunks = [] |
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59 self.available_data = 0 |
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60 |
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61 def _addchunk(self, data): |
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62 self._done_chunks.append(data) |
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63 self.available_data += len(data) |
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64 |
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65 def _pushchunk(self, data): |
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66 self._done_chunks.insert(0, data) |
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67 self.available_data += len(data) |
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68 |
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69 def _popchunk(self): |
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70 b = self._done_chunks.pop(0) |
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71 self.available_data -= len(b) |
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72 |
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73 return b |
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74 |
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75 def done(self): |
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76 """Returns true if the response body is entirely read.""" |
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77 return self._finished |
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78 |
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79 def read(self, amt): |
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80 """Read amt bytes from the response body.""" |
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81 if self.available_data < amt and not self._finished: |
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82 raise ReadNotReady() |
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83 blocks = [] |
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84 need = amt |
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85 while self._done_chunks: |
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86 b = self._popchunk() |
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87 if len(b) > need: |
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88 nb = b[:need] |
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89 self._pushchunk(b[need:]) |
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90 b = nb |
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91 blocks.append(b) |
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92 need -= len(b) |
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93 if need == 0: |
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94 break |
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95 result = ''.join(blocks) |
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96 assert len(result) == amt or (self._finished and len(result) < amt) |
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97 |
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98 return result |
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99 |
19038 | 100 def readto(self, delimstr, blocks = None): |
101 """return available data chunks up to the first one in which delimstr | |
102 occurs. No data will be returned after delimstr -- the chunk in which | |
103 it occurs will be split and the remainder pushed back onto the available | |
104 data queue. If blocks is supplied chunks will be added to blocks, otherwise | |
105 a new list will be allocated. | |
106 """ | |
107 if blocks is None: | |
108 blocks = [] | |
109 | |
110 while self._done_chunks: | |
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111 b = self._popchunk() |
19038 | 112 i = b.find(delimstr) + len(delimstr) |
113 if i: | |
114 if i < len(b): | |
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115 self._pushchunk(b[i:]) |
19038 | 116 blocks.append(b[:i]) |
117 break | |
118 else: | |
119 blocks.append(b) | |
120 | |
121 return blocks | |
122 | |
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123 def _load(self, data): # pragma: no cover |
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124 """Subclasses must implement this. |
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125 |
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126 As data is available to be read out of this object, it should |
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127 be placed into the _done_chunks list. Subclasses should not |
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128 rely on data remaining in _done_chunks forever, as it may be |
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129 reaped if the client is parsing data as it comes in. |
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130 """ |
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131 raise NotImplementedError |
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132 |
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133 def _close(self): |
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134 """Default implementation of close. |
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135 |
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136 The default implementation assumes that the reader will mark |
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137 the response as finished on the _finished attribute once the |
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138 entire response body has been read. In the event that this is |
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139 not true, the subclass should override the implementation of |
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140 close (for example, close-is-end responses have to set |
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141 self._finished in the close handler.) |
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142 """ |
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143 if not self._finished: |
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144 raise HTTPRemoteClosedError( |
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145 'server appears to have closed the socket mid-response') |
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146 |
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147 |
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148 class AbstractSimpleReader(AbstractReader): |
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149 """Abstract base class for simple readers that require no response decoding. |
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150 |
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151 Examples of such responses are Connection: Close (close-is-end) |
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152 and responses that specify a content length. |
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153 """ |
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154 def _load(self, data): |
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155 if data: |
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156 assert not self._finished, ( |
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157 'tried to add data (%r) to a closed reader!' % data) |
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158 logger.debug('%s read an additional %d data', |
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159 self.name, len(data)) # pylint: disable=E1101 |
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160 self._addchunk(data) |
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161 |
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162 |
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163 class CloseIsEndReader(AbstractSimpleReader): |
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164 """Reader for responses that specify Connection: Close for length.""" |
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165 name = 'close-is-end' |
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166 |
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167 def _close(self): |
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168 logger.info('Marking close-is-end reader as closed.') |
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169 self._finished = True |
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170 |
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171 |
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172 class ContentLengthReader(AbstractSimpleReader): |
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173 """Reader for responses that specify an exact content length.""" |
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174 name = 'content-length' |
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175 |
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176 def __init__(self, amount): |
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177 AbstractSimpleReader.__init__(self) |
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178 self._amount = amount |
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179 if amount == 0: |
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180 self._finished = True |
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181 self._amount_seen = 0 |
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182 |
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183 def _load(self, data): |
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184 AbstractSimpleReader._load(self, data) |
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185 self._amount_seen += len(data) |
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186 if self._amount_seen >= self._amount: |
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187 self._finished = True |
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188 logger.debug('content-length read complete') |
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189 |
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190 |
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191 class ChunkedReader(AbstractReader): |
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192 """Reader for chunked transfer encoding responses.""" |
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193 def __init__(self, eol): |
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194 AbstractReader.__init__(self) |
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195 self._eol = eol |
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196 self._leftover_skip_amt = 0 |
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197 self._leftover_data = '' |
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198 |
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199 def _load(self, data): |
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200 assert not self._finished, 'tried to add data to a closed reader!' |
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201 logger.debug('chunked read an additional %d data', len(data)) |
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202 position = 0 |
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203 if self._leftover_data: |
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204 logger.debug( |
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205 'chunked reader trying to finish block from leftover data') |
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206 # TODO: avoid this string concatenation if possible |
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207 data = self._leftover_data + data |
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208 position = self._leftover_skip_amt |
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209 self._leftover_data = '' |
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210 self._leftover_skip_amt = 0 |
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211 datalen = len(data) |
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212 while position < datalen: |
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213 split = data.find(self._eol, position) |
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214 if split == -1: |
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215 self._leftover_data = data |
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216 self._leftover_skip_amt = position |
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217 return |
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218 amt = int(data[position:split], base=16) |
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219 block_start = split + len(self._eol) |
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220 # If the whole data chunk plus the eol trailer hasn't |
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221 # loaded, we'll wait for the next load. |
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222 if block_start + amt + len(self._eol) > len(data): |
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223 self._leftover_data = data |
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224 self._leftover_skip_amt = position |
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225 return |
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226 if amt == 0: |
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227 self._finished = True |
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228 logger.debug('closing chunked reader due to chunk of length 0') |
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229 return |
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230 self._addchunk(data[block_start:block_start + amt]) |
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231 position = block_start + amt + len(self._eol) |
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232 # no-check-code |