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annotate venv/lib/python2.7/site-packages/requests_toolbelt/multipart/encoder.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 # -*- coding: utf-8 -*-
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2 """
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3
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4 requests_toolbelt.multipart.encoder
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5 ===================================
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6
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7 This holds all of the implementation details of the MultipartEncoder
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8
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9 """
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10
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11 from requests.utils import super_len
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12 from requests.packages.urllib3 import fields
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13 from uuid import uuid4
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14
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15 import contextlib
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16 import io
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17
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18
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19 class MultipartEncoder(object):
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20
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21 """
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22
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23 The ``MultipartEncoder`` oject is a generic interface to the engine that
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24 will create a ``multipart/form-data`` body for you.
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25
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26 The basic usage is:
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27
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28 .. code-block:: python
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29
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30 import requests
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31 from requests_toolbelt import MultipartEncoder
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32
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33 encoder = MultipartEncoder({'field': 'value',
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34 'other_field', 'other_value'})
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35 r = requests.post('https://httpbin.org/post', data=encoder,
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36 headers={'Content-Type': encoder.content_type})
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37
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38 If you do not need to take advantage of streaming the post body, you can
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39 also do:
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40
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41 .. code-block:: python
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42
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43 r = requests.post('https://httpbin.org/post',
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44 data=encoder.to_string(),
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45 headers={'Content-Type': encoder.content_type})
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46
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47 If you want the encoder to use a specific order, you can use an
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48 OrderedDict or more simply, a list of tuples:
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49
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50 .. code-block:: python
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51
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52 encoder = MultipartEncoder([('field', 'value'),
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53 ('other_field', 'other_value')])
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54
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55 .. versionchanged:: 0.4.0
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56
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57 You can also provide tuples as part values as you would provide them to
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58 requests' ``files`` parameter.
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59
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60 .. code-block:: python
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61
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62 encoder = MultipartEncoder({
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63 'field': ('file_name', b'{"a": "b"}', 'application/json',
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64 {'X-My-Header': 'my-value'})
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65 ])
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66
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67 .. warning::
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68
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69 This object will end up directly in :mod:`httplib`. Currently,
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70 :mod:`httplib` has a hard-coded read size of **8192 bytes**. This
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71 means that it will loop until the file has been read and your upload
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72 could take a while. This is **not** a bug in requests. A feature is
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73 being considered for this object to allow you, the user, to specify
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74 what size should be returned on a read. If you have opinions on this,
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75 please weigh in on `this issue`_.
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76
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77 .. _this issue:
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78 https://github.com/sigmavirus24/requests-toolbelt/issues/75
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79
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80 """
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81
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82 def __init__(self, fields, boundary=None, encoding='utf-8'):
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83 #: Boundary value either passed in by the user or created
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84 self.boundary_value = boundary or uuid4().hex
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85
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86 # Computed boundary
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87 self.boundary = '--{0}'.format(self.boundary_value)
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88
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89 #: Encoding of the data being passed in
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90 self.encoding = encoding
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91
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92 # Pre-encoded boundary
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93 self._encoded_boundary = b''.join([
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94 encode_with(self.boundary, self.encoding),
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95 encode_with('\r\n', self.encoding)
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96 ])
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97
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98 #: Fields provided by the user
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99 self.fields = fields
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100
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101 #: Whether or not the encoder is finished
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102 self.finished = False
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103
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104 #: Pre-computed parts of the upload
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105 self.parts = []
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106
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107 # Pre-computed parts iterator
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108 self._iter_parts = iter([])
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109
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110 # The part we're currently working with
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111 self._current_part = None
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112
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113 # Cached computation of the body's length
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114 self._len = None
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115
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116 # Our buffer
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117 self._buffer = CustomBytesIO(encoding=encoding)
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118
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119 # Pre-compute each part's headers
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120 self._prepare_parts()
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121
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122 # Load boundary into buffer
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123 self._write_boundary()
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124
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125 @property
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126 def len(self):
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127 """Length of the multipart/form-data body.
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128
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129 requests will first attempt to get the length of the body by calling
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130 ``len(body)`` and then by checking for the ``len`` attribute.
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131
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132 On 32-bit systems, the ``__len__`` method cannot return anything
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133 larger than an integer (in C) can hold. If the total size of the body
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134 is even slightly larger than 4GB users will see an OverflowError. This
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135 manifested itself in `bug #80`_.
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136
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137 As such, we now calculate the length lazily as a property.
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138
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139 .. _bug #80:
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140 https://github.com/sigmavirus24/requests-toolbelt/issues/80
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141 """
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142 # If _len isn't already calculated, calculate, return, and set it
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143 return self._len or self._calculate_length()
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144
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145 def __repr__(self):
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146 return '<MultipartEncoder: {0!r}>'.format(self.fields)
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147
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148 def _calculate_length(self):
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149 """
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150 This uses the parts to calculate the length of the body.
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151
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152 This returns the calculated length so __len__ can be lazy.
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153 """
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154 boundary_len = len(self.boundary) # Length of --{boundary}
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155 # boundary length + header length + body length + len('\r\n') * 2
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156 self._len = sum(
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157 (boundary_len + super_len(p) + 4) for p in self.parts
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158 ) + boundary_len + 4
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159 return self._len
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160
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161 def _calculate_load_amount(self, read_size):
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162 """This calculates how many bytes need to be added to the buffer.
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163
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164 When a consumer read's ``x`` from the buffer, there are two cases to
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165 satisfy:
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166
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167 1. Enough data in the buffer to return the requested amount
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168 2. Not enough data
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169
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170 This function uses the amount of unread bytes in the buffer and
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171 determines how much the Encoder has to load before it can return the
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172 requested amount of bytes.
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173
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174 :param int read_size: the number of bytes the consumer requests
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175 :returns: int -- the number of bytes that must be loaded into the
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176 buffer before the read can be satisfied. This will be strictly
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177 non-negative
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178 """
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179 amount = read_size - super_len(self._buffer)
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180 return amount if amount > 0 else 0
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181
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182 def _load(self, amount):
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183 """Load ``amount`` number of bytes into the buffer."""
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184 self._buffer.smart_truncate()
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185 part = self._current_part or self._next_part()
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186 while amount == -1 or amount > 0:
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187 written = 0
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188 if not part.bytes_left_to_write():
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189 written += self._write(b'\r\n')
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190 written += self._write_boundary()
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191 part = self._next_part()
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192
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193 if not part:
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194 written += self._write_closing_boundary()
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195 self.finished = True
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196 break
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197
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198 written += part.write_to(self._buffer, amount)
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199
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200 if amount != -1:
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201 amount -= written
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202
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203 def _next_part(self):
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204 try:
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205 p = self._current_part = next(self._iter_parts)
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206 except StopIteration:
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207 p = None
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208 return p
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209
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210 def _iter_fields(self):
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211 _fields = self.fields
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212 if hasattr(self.fields, 'items'):
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213 _fields = list(self.fields.items())
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214 for k, v in _fields:
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215 file_name = None
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216 file_type = None
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217 file_headers = None
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218 if isinstance(v, (list, tuple)):
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219 if len(v) == 2:
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220 file_name, file_pointer = v
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221 elif len(v) == 3:
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222 file_name, file_pointer, file_type = v
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223 else:
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224 file_name, file_pointer, file_type, file_headers = v
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225 else:
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226 file_pointer = v
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227
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228 field = fields.RequestField(name=k, data=file_pointer,
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229 filename=file_name,
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230 headers=file_headers)
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231 field.make_multipart(content_type=file_type)
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232 yield field
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233
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234 def _prepare_parts(self):
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235 """This uses the fields provided by the user and creates Part objects.
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236
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237 It populates the `parts` attribute and uses that to create a
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238 generator for iteration.
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239 """
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240 enc = self.encoding
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241 self.parts = [Part.from_field(f, enc) for f in self._iter_fields()]
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242 self._iter_parts = iter(self.parts)
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243
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244 def _write(self, bytes_to_write):
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245 """Write the bytes to the end of the buffer.
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246
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247 :param bytes bytes_to_write: byte-string (or bytearray) to append to
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248 the buffer
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249 :returns: int -- the number of bytes written
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250 """
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251 return self._buffer.append(bytes_to_write)
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252
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253 def _write_boundary(self):
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254 """Write the boundary to the end of the buffer."""
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255 return self._write(self._encoded_boundary)
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256
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257 def _write_closing_boundary(self):
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258 """Write the bytes necessary to finish a multipart/form-data body."""
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259 with reset(self._buffer):
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260 self._buffer.seek(-2, 2)
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261 self._buffer.write(b'--\r\n')
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262 return 2
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263
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264 def _write_headers(self, headers):
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265 """Write the current part's headers to the buffer."""
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266 return self._write(encode_with(headers, self.encoding))
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267
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268 @property
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269 def content_type(self):
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270 return str(
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271 'multipart/form-data; boundary={0}'.format(self.boundary_value)
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272 )
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273
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274 def to_string(self):
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275 return self.read()
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276
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277 def read(self, size=-1):
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278 """Read data from the streaming encoder.
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279
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280 :param int size: (optional), If provided, ``read`` will return exactly
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281 that many bytes. If it is not provided, it will return the
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282 remaining bytes.
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283 :returns: bytes
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284 """
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285 if self.finished:
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286 return self._buffer.read(size)
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287
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288 bytes_to_load = size
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289 if bytes_to_load != -1 and bytes_to_load is not None:
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290 bytes_to_load = self._calculate_load_amount(int(size))
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291
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292 self._load(bytes_to_load)
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293 return self._buffer.read(size)
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294
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295
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296 def IDENTITY(monitor):
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297 return monitor
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298
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299
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300 class MultipartEncoderMonitor(object):
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301
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302 """
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303 An object used to monitor the progress of a :class:`MultipartEncoder`.
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304
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305 The :class:`MultipartEncoder` should only be responsible for preparing and
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306 streaming the data. For anyone who wishes to monitor it, they shouldn't be
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307 using that instance to manage that as well. Using this class, they can
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308 monitor an encoder and register a callback. The callback receives the
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309 instance of the monitor.
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310
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311 To use this monitor, you construct your :class:`MultipartEncoder` as you
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312 normally would.
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313
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314 .. code-block:: python
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315
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316 from requests_toolbelt import (MultipartEncoder,
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317 MultipartEncoderMonitor)
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318 import requests
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319
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320 def callback(encoder, bytes_read):
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321 # Do something with this information
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322 pass
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323
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324 m = MultipartEncoder(fields={'field0': 'value0'})
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325 monitor = MultipartEncoderMonitor(m, callback)
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326 headers = {'Content-Type': montior.content_type}
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327 r = requests.post('https://httpbin.org/post', data=monitor,
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328 headers=headers)
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329
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330 Alternatively, if your use case is very simple, you can use the following
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331 pattern.
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332
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333 .. code-block:: python
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334
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335 from requests_toolbelt import MultipartEncoderMonitor
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336 import requests
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337
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338 def callback(encoder, bytes_read):
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339 # Do something with this information
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340 pass
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341
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342 monitor = MultipartEncoderMonitor.from_fields(
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343 fields={'field0': 'value0'}, callback
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344 )
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345 headers = {'Content-Type': montior.content_type}
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346 r = requests.post('https://httpbin.org/post', data=monitor,
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347 headers=headers)
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348
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349 """
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350
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351 def __init__(self, encoder, callback=None):
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352 #: Instance of the :class:`MultipartEncoder` being monitored
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353 self.encoder = encoder
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354
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355 #: Optionally function to call after a read
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356 self.callback = callback or IDENTITY
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357
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358 #: Number of bytes already read from the :class:`MultipartEncoder`
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359 #: instance
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360 self.bytes_read = 0
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361
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362 #: Avoid the same problem in bug #80
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363 self.len = self.encoder.len
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364
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365 @classmethod
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366 def from_fields(cls, fields, boundary=None, encoding='utf-8',
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367 callback=None):
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368 encoder = MultipartEncoder(fields, boundary, encoding)
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369 return cls(encoder, callback)
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370
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371 @property
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372 def content_type(self):
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373 return self.encoder.content_type
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374
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375 def to_string(self):
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376 return self.read()
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377
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378 def read(self, size=-1):
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379 string = self.encoder.read(size)
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380 self.bytes_read += len(string)
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381 self.callback(self)
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382 return string
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383
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384
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385 def encode_with(string, encoding):
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386 """Encoding ``string`` with ``encoding`` if necessary.
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387
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388 :param str string: If string is a bytes object, it will not encode it.
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389 Otherwise, this function will encode it with the provided encoding.
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390 :param str encoding: The encoding with which to encode string.
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391 :returns: encoded bytes object
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392 """
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393 if not (string is None or isinstance(string, bytes)):
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394 return string.encode(encoding)
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395 return string
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396
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397
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398 def readable_data(data, encoding):
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399 """Coerce the data to an object with a ``read`` method."""
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400 if hasattr(data, 'read'):
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401 return data
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402
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403 return CustomBytesIO(data, encoding)
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404
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405
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406 @contextlib.contextmanager
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407 def reset(buffer):
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408 """Keep track of the buffer's current position and write to the end.
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409
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410 This is a context manager meant to be used when adding data to the buffer.
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411 It eliminates the need for every function to be concerned with the
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412 position of the cursor in the buffer.
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413 """
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414 original_position = buffer.tell()
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415 buffer.seek(0, 2)
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416 yield
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417 buffer.seek(original_position, 0)
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418
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419
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420 def coerce_data(data, encoding):
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421 """Ensure that every object's __len__ behaves uniformly."""
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422 if not isinstance(data, CustomBytesIO):
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423 if hasattr(data, 'getvalue'):
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424 return CustomBytesIO(data.getvalue(), encoding)
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425
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426 if hasattr(data, 'fileno'):
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427 return FileWrapper(data)
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428
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429 if not hasattr(data, 'read'):
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430 return CustomBytesIO(data, encoding)
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431
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432 return data
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433
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434
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435 def to_list(fields):
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436 if hasattr(fields, 'items'):
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437 return list(fields.items())
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438 return list(fields)
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439
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440
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441 class Part(object):
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442 def __init__(self, headers, body):
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443 self.headers = headers
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444 self.body = body
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445 self.headers_unread = True
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446 self.len = len(self.headers) + super_len(self.body)
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447
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448 @classmethod
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449 def from_field(cls, field, encoding):
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450 """Create a part from a Request Field generated by urllib3."""
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451 headers = encode_with(field.render_headers(), encoding)
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452 body = coerce_data(field.data, encoding)
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453 return cls(headers, body)
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454
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455 def bytes_left_to_write(self):
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456 """Determine if there are bytes left to write.
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457
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458 :returns: bool -- ``True`` if there are bytes left to write, otherwise
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459 ``False``
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460 """
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461 to_read = 0
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462 if self.headers_unread:
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463 to_read += len(self.headers)
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464
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465 return (to_read + super_len(self.body)) > 0
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466
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467 def write_to(self, buffer, size):
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468 """Write the requested amount of bytes to the buffer provided.
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469
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470 The number of bytes written may exceed size on the first read since we
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471 load the headers ambitiously.
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472
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473 :param CustomBytesIO buffer: buffer we want to write bytes to
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474 :param int size: number of bytes requested to be written to the buffer
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475 :returns: int -- number of bytes actually written
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476 """
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477 written = 0
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478 if self.headers_unread:
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479 written += buffer.append(self.headers)
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480 self.headers_unread = False
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481
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482 while super_len(self.body) > 0 and (size == -1 or written < size):
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483 amount_to_read = size
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484 if size != -1:
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485 amount_to_read = size - written
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486 written += buffer.append(self.body.read(amount_to_read))
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487
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488 return written
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489
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490
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491 class CustomBytesIO(io.BytesIO):
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492 def __init__(self, buffer=None, encoding='utf-8'):
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493 buffer = encode_with(buffer, encoding)
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494 super(CustomBytesIO, self).__init__(buffer)
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495
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496 def _get_end(self):
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497 current_pos = self.tell()
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498 self.seek(0, 2)
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499 length = self.tell()
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500 self.seek(current_pos, 0)
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501 return length
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502
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503 @property
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504 def len(self):
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505 length = self._get_end()
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506 return length - self.tell()
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507
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508 def append(self, bytes):
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509 with reset(self):
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510 written = self.write(bytes)
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511 return written
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512
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513 def smart_truncate(self):
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514 to_be_read = super_len(self)
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515 already_read = self._get_end() - to_be_read
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516
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517 if already_read >= to_be_read:
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518 old_bytes = self.read()
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519 self.seek(0, 0)
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520 self.truncate()
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521 self.write(old_bytes)
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522 self.seek(0, 0) # We want to be at the beginning
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523
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524
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525 class FileWrapper(object):
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526 def __init__(self, file_object):
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527 self.fd = file_object
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528
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529 @property
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530 def len(self):
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531 return super_len(self.fd) - self.fd.tell()
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532
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533 def read(self, length=-1):
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534 return self.fd.read(length)