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annotate mercurial/httpclient/_readers.py @ 19036:19d1cc30e7a3

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http2: track available data as it changes instead of recomputing it With a large amount of available data, this computation can become costly.
author Brendan Cully <brendan@kublai.com>
date Fri, 01 Feb 2013 14:41:33 -0800
parents e7cfe3587ea4
children 1fde25ad9396
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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 itertools
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37 import logging
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38
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39 logger = logging.getLogger(__name__)
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40
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41
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42 class ReadNotReady(Exception):
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43 """Raised when read() is attempted but not enough data is loaded."""
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44
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45
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46 class HTTPRemoteClosedError(httplib.HTTPException):
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47 """The server closed the remote socket in the middle of a response."""
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48
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49
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50 class AbstractReader(object):
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51 """Abstract base class for response readers.
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52
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53 Subclasses must implement _load, and should implement _close if
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54 it's not an error for the server to close their socket without
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55 some termination condition being detected during _load.
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56 """
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57 def __init__(self):
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58 self._finished = False
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59 self._done_chunks = []
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60 self.available_data = 0
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61
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62 def addchunk(self, data):
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63 self._done_chunks.append(data)
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64 self.available_data += len(data)
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65
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66 def pushchunk(self, data):
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67 self._done_chunks.insert(0, data)
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68 self.available_data += len(data)
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69
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70 def popchunk(self):
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71 b = self._done_chunks.pop(0)
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72 self.available_data -= len(b)
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73
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74 return b
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75
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76 def done(self):
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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 if self.available_data < amt and not self._finished:
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81 raise ReadNotReady()
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82 need = [amt]
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83 def pred(s):
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84 needed = need[0] > 0
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85 need[0] -= len(s)
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86 return needed
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87 blocks = list(itertools.takewhile(pred, self._done_chunks))
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88 self._done_chunks = self._done_chunks[len(blocks):]
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89 over_read = sum(map(len, blocks)) - amt
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90 if over_read > 0 and blocks:
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91 logger.debug('need to reinsert %d data into done chunks', over_read)
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92 last = blocks[-1]
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93 blocks[-1], reinsert = last[:-over_read], last[-over_read:]
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94 self._done_chunks.insert(0, reinsert)
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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 self.available_data -= amt
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98 return result
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99
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100 def _load(self, data): # pragma: no cover
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101 """Subclasses must implement this.
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102
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103 As data is available to be read out of this object, it should
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104 be placed into the _done_chunks list. Subclasses should not
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105 rely on data remaining in _done_chunks forever, as it may be
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106 reaped if the client is parsing data as it comes in.
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107 """
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108 raise NotImplementedError
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109
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110 def _close(self):
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111 """Default implementation of close.
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112
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113 The default implementation assumes that the reader will mark
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114 the response as finished on the _finished attribute once the
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115 entire response body has been read. In the event that this is
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116 not true, the subclass should override the implementation of
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117 close (for example, close-is-end responses have to set
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118 self._finished in the close handler.)
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119 """
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120 if not self._finished:
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121 raise HTTPRemoteClosedError(
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122 'server appears to have closed the socket mid-response')
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123
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124
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125 class AbstractSimpleReader(AbstractReader):
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126 """Abstract base class for simple readers that require no response decoding.
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127
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128 Examples of such responses are Connection: Close (close-is-end)
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129 and responses that specify a content length.
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130 """
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131 def _load(self, data):
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132 if data:
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133 assert not self._finished, (
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134 'tried to add data (%r) to a closed reader!' % data)
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135 logger.debug('%s read an additional %d data', self.name, len(data))
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136 self.addchunk(data)
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137
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138
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139 class CloseIsEndReader(AbstractSimpleReader):
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140 """Reader for responses that specify Connection: Close for length."""
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141 name = 'close-is-end'
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142
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143 def _close(self):
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144 logger.info('Marking close-is-end reader as closed.')
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145 self._finished = True
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146
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147
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148 class ContentLengthReader(AbstractSimpleReader):
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149 """Reader for responses that specify an exact content length."""
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150 name = 'content-length'
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151
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152 def __init__(self, amount):
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153 AbstractReader.__init__(self)
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154 self._amount = amount
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155 if amount == 0:
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156 self._finished = True
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157 self._amount_seen = 0
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158
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159 def _load(self, data):
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160 AbstractSimpleReader._load(self, data)
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161 self._amount_seen += len(data)
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162 if self._amount_seen >= self._amount:
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163 self._finished = True
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164 logger.debug('content-length read complete')
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165
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166
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167 class ChunkedReader(AbstractReader):
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168 """Reader for chunked transfer encoding responses."""
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169 def __init__(self, eol):
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170 AbstractReader.__init__(self)
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171 self._eol = eol
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172 self._leftover_skip_amt = 0
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173 self._leftover_data = ''
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174
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175 def _load(self, data):
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176 assert not self._finished, 'tried to add data to a closed reader!'
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177 logger.debug('chunked read an additional %d data', len(data))
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178 position = 0
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179 if self._leftover_data:
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180 logger.debug('chunked reader trying to finish block from leftover data')
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181 # TODO: avoid this string concatenation if possible
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182 data = self._leftover_data + data
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183 position = self._leftover_skip_amt
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184 self._leftover_data = ''
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185 self._leftover_skip_amt = 0
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186 datalen = len(data)
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187 while position < datalen:
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188 split = data.find(self._eol, position)
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189 if split == -1:
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190 self._leftover_data = data
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191 self._leftover_skip_amt = position
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192 return
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193 amt = int(data[position:split], base=16)
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194 block_start = split + len(self._eol)
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195 # If the whole data chunk plus the eol trailer hasn't
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196 # loaded, we'll wait for the next load.
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197 if block_start + amt + len(self._eol) > len(data):
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198 self._leftover_data = data
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199 self._leftover_skip_amt = position
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200 return
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201 if amt == 0:
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202 self._finished = True
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203 logger.debug('closing chunked reader due to chunk of length 0')
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204 return
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205 self.addchunk(data[block_start:block_start + amt])
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206 position = block_start + amt + len(self._eol)
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207 # no-check-code