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annotate env/lib/python3.7/site-packages/requests_toolbelt/multipart/encoder.py @ 3:758bc20232e8 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:20:52 -0400
parents 26e78fe6e8c4
children
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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 import contextlib
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11 import io
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12 import os
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13 from uuid import uuid4
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14
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15 import requests
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16
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17 from .._compat import fields
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18
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19
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20 class FileNotSupportedError(Exception):
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21 """File not supported error."""
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22
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23
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24 class MultipartEncoder(object):
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25
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26 """
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27
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28 The ``MultipartEncoder`` object is a generic interface to the engine that
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29 will create a ``multipart/form-data`` body for you.
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30
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31 The basic usage is:
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32
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33 .. code-block:: python
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34
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35 import requests
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36 from requests_toolbelt import MultipartEncoder
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37
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38 encoder = MultipartEncoder({'field': 'value',
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39 'other_field', 'other_value'})
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40 r = requests.post('https://httpbin.org/post', data=encoder,
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41 headers={'Content-Type': encoder.content_type})
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42
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43 If you do not need to take advantage of streaming the post body, you can
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44 also do:
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45
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46 .. code-block:: python
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47
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48 r = requests.post('https://httpbin.org/post',
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49 data=encoder.to_string(),
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50 headers={'Content-Type': encoder.content_type})
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51
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52 If you want the encoder to use a specific order, you can use an
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53 OrderedDict or more simply, a list of tuples:
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54
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55 .. code-block:: python
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56
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57 encoder = MultipartEncoder([('field', 'value'),
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58 ('other_field', 'other_value')])
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59
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60 .. versionchanged:: 0.4.0
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61
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62 You can also provide tuples as part values as you would provide them to
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63 requests' ``files`` parameter.
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64
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65 .. code-block:: python
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66
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67 encoder = MultipartEncoder({
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68 'field': ('file_name', b'{"a": "b"}', 'application/json',
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69 {'X-My-Header': 'my-value'})
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70 ])
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71
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72 .. warning::
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73
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74 This object will end up directly in :mod:`httplib`. Currently,
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75 :mod:`httplib` has a hard-coded read size of **8192 bytes**. This
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76 means that it will loop until the file has been read and your upload
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77 could take a while. This is **not** a bug in requests. A feature is
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78 being considered for this object to allow you, the user, to specify
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79 what size should be returned on a read. If you have opinions on this,
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80 please weigh in on `this issue`_.
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81
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82 .. _this issue:
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83 https://github.com/requests/toolbelt/issues/75
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84
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85 """
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86
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87 def __init__(self, fields, boundary=None, encoding='utf-8'):
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88 #: Boundary value either passed in by the user or created
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89 self.boundary_value = boundary or uuid4().hex
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90
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91 # Computed boundary
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92 self.boundary = '--{0}'.format(self.boundary_value)
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93
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94 #: Encoding of the data being passed in
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95 self.encoding = encoding
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96
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97 # Pre-encoded boundary
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98 self._encoded_boundary = b''.join([
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99 encode_with(self.boundary, self.encoding),
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100 encode_with('\r\n', self.encoding)
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101 ])
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102
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103 #: Fields provided by the user
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104 self.fields = fields
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105
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106 #: Whether or not the encoder is finished
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107 self.finished = False
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108
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109 #: Pre-computed parts of the upload
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110 self.parts = []
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111
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112 # Pre-computed parts iterator
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113 self._iter_parts = iter([])
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114
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115 # The part we're currently working with
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116 self._current_part = None
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117
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118 # Cached computation of the body's length
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119 self._len = None
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120
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121 # Our buffer
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122 self._buffer = CustomBytesIO(encoding=encoding)
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123
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124 # Pre-compute each part's headers
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125 self._prepare_parts()
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126
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127 # Load boundary into buffer
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128 self._write_boundary()
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129
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130 @property
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131 def len(self):
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132 """Length of the multipart/form-data body.
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133
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134 requests will first attempt to get the length of the body by calling
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135 ``len(body)`` and then by checking for the ``len`` attribute.
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136
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137 On 32-bit systems, the ``__len__`` method cannot return anything
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138 larger than an integer (in C) can hold. If the total size of the body
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139 is even slightly larger than 4GB users will see an OverflowError. This
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140 manifested itself in `bug #80`_.
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141
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142 As such, we now calculate the length lazily as a property.
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143
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144 .. _bug #80:
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145 https://github.com/requests/toolbelt/issues/80
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146 """
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147 # If _len isn't already calculated, calculate, return, and set it
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148 return self._len or self._calculate_length()
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149
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150 def __repr__(self):
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151 return '<MultipartEncoder: {0!r}>'.format(self.fields)
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152
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153 def _calculate_length(self):
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154 """
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155 This uses the parts to calculate the length of the body.
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156
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157 This returns the calculated length so __len__ can be lazy.
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158 """
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159 boundary_len = len(self.boundary) # Length of --{boundary}
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160 # boundary length + header length + body length + len('\r\n') * 2
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161 self._len = sum(
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162 (boundary_len + total_len(p) + 4) for p in self.parts
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163 ) + boundary_len + 4
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164 return self._len
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165
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166 def _calculate_load_amount(self, read_size):
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167 """This calculates how many bytes need to be added to the buffer.
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168
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169 When a consumer read's ``x`` from the buffer, there are two cases to
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170 satisfy:
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171
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172 1. Enough data in the buffer to return the requested amount
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173 2. Not enough data
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174
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175 This function uses the amount of unread bytes in the buffer and
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176 determines how much the Encoder has to load before it can return the
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177 requested amount of bytes.
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178
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179 :param int read_size: the number of bytes the consumer requests
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180 :returns: int -- the number of bytes that must be loaded into the
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181 buffer before the read can be satisfied. This will be strictly
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182 non-negative
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183 """
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184 amount = read_size - total_len(self._buffer)
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185 return amount if amount > 0 else 0
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186
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187 def _load(self, amount):
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188 """Load ``amount`` number of bytes into the buffer."""
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189 self._buffer.smart_truncate()
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190 part = self._current_part or self._next_part()
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191 while amount == -1 or amount > 0:
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192 written = 0
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193 if part and not part.bytes_left_to_write():
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194 written += self._write(b'\r\n')
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195 written += self._write_boundary()
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196 part = self._next_part()
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197
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198 if not part:
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199 written += self._write_closing_boundary()
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200 self.finished = True
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201 break
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202
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203 written += part.write_to(self._buffer, amount)
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204
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205 if amount != -1:
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206 amount -= written
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207
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208 def _next_part(self):
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209 try:
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210 p = self._current_part = next(self._iter_parts)
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211 except StopIteration:
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212 p = None
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213 return p
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214
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215 def _iter_fields(self):
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216 _fields = self.fields
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217 if hasattr(self.fields, 'items'):
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218 _fields = list(self.fields.items())
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219 for k, v in _fields:
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220 file_name = None
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221 file_type = None
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222 file_headers = None
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223 if isinstance(v, (list, tuple)):
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224 if len(v) == 2:
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225 file_name, file_pointer = v
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226 elif len(v) == 3:
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227 file_name, file_pointer, file_type = v
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228 else:
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229 file_name, file_pointer, file_type, file_headers = v
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230 else:
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231 file_pointer = v
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232
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233 field = fields.RequestField(name=k, data=file_pointer,
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234 filename=file_name,
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235 headers=file_headers)
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236 field.make_multipart(content_type=file_type)
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237 yield field
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238
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239 def _prepare_parts(self):
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240 """This uses the fields provided by the user and creates Part objects.
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241
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242 It populates the `parts` attribute and uses that to create a
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243 generator for iteration.
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244 """
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245 enc = self.encoding
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246 self.parts = [Part.from_field(f, enc) for f in self._iter_fields()]
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247 self._iter_parts = iter(self.parts)
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248
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249 def _write(self, bytes_to_write):
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250 """Write the bytes to the end of the buffer.
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251
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252 :param bytes bytes_to_write: byte-string (or bytearray) to append to
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253 the buffer
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254 :returns: int -- the number of bytes written
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255 """
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256 return self._buffer.append(bytes_to_write)
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257
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258 def _write_boundary(self):
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259 """Write the boundary to the end of the buffer."""
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260 return self._write(self._encoded_boundary)
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261
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262 def _write_closing_boundary(self):
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263 """Write the bytes necessary to finish a multipart/form-data body."""
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264 with reset(self._buffer):
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265 self._buffer.seek(-2, 2)
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266 self._buffer.write(b'--\r\n')
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267 return 2
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268
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269 def _write_headers(self, headers):
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270 """Write the current part's headers to the buffer."""
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271 return self._write(encode_with(headers, self.encoding))
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272
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273 @property
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274 def content_type(self):
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275 return str(
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276 'multipart/form-data; boundary={0}'.format(self.boundary_value)
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277 )
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278
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279 def to_string(self):
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280 """Return the entirety of the data in the encoder.
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281
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282 .. note::
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283
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284 This simply reads all of the data it can. If you have started
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285 streaming or reading data from the encoder, this method will only
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286 return whatever data is left in the encoder.
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287
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288 .. note::
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289
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290 This method affects the internal state of the encoder. Calling
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291 this method will exhaust the encoder.
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292
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293 :returns: the multipart message
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294 :rtype: bytes
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295 """
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296
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297 return self.read()
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298
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299 def read(self, size=-1):
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300 """Read data from the streaming encoder.
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301
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302 :param int size: (optional), If provided, ``read`` will return exactly
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303 that many bytes. If it is not provided, it will return the
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304 remaining bytes.
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305 :returns: bytes
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306 """
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307 if self.finished:
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308 return self._buffer.read(size)
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309
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310 bytes_to_load = size
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311 if bytes_to_load != -1 and bytes_to_load is not None:
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312 bytes_to_load = self._calculate_load_amount(int(size))
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313
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314 self._load(bytes_to_load)
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315 return self._buffer.read(size)
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316
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317
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318 def IDENTITY(monitor):
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319 return monitor
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320
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321
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322 class MultipartEncoderMonitor(object):
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323
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324 """
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325 An object used to monitor the progress of a :class:`MultipartEncoder`.
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326
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327 The :class:`MultipartEncoder` should only be responsible for preparing and
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328 streaming the data. For anyone who wishes to monitor it, they shouldn't be
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329 using that instance to manage that as well. Using this class, they can
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330 monitor an encoder and register a callback. The callback receives the
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331 instance of the monitor.
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332
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333 To use this monitor, you construct your :class:`MultipartEncoder` as you
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334 normally would.
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335
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336 .. code-block:: python
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337
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338 from requests_toolbelt import (MultipartEncoder,
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339 MultipartEncoderMonitor)
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340 import requests
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341
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342 def callback(monitor):
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343 # Do something with this information
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344 pass
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345
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346 m = MultipartEncoder(fields={'field0': 'value0'})
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347 monitor = MultipartEncoderMonitor(m, callback)
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348 headers = {'Content-Type': monitor.content_type}
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349 r = requests.post('https://httpbin.org/post', data=monitor,
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350 headers=headers)
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351
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352 Alternatively, if your use case is very simple, you can use the following
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353 pattern.
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354
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355 .. code-block:: python
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356
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357 from requests_toolbelt import MultipartEncoderMonitor
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358 import requests
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359
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360 def callback(monitor):
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361 # Do something with this information
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362 pass
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363
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364 monitor = MultipartEncoderMonitor.from_fields(
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365 fields={'field0': 'value0'}, callback
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366 )
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367 headers = {'Content-Type': montior.content_type}
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368 r = requests.post('https://httpbin.org/post', data=monitor,
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369 headers=headers)
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370
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371 """
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372
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373 def __init__(self, encoder, callback=None):
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374 #: Instance of the :class:`MultipartEncoder` being monitored
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375 self.encoder = encoder
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376
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377 #: Optionally function to call after a read
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378 self.callback = callback or IDENTITY
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379
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380 #: Number of bytes already read from the :class:`MultipartEncoder`
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381 #: instance
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382 self.bytes_read = 0
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383
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384 #: Avoid the same problem in bug #80
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385 self.len = self.encoder.len
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386
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387 @classmethod
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388 def from_fields(cls, fields, boundary=None, encoding='utf-8',
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389 callback=None):
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390 encoder = MultipartEncoder(fields, boundary, encoding)
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391 return cls(encoder, callback)
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392
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393 @property
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394 def content_type(self):
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parents:
diff changeset
395 return self.encoder.content_type
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396
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diff changeset
397 def to_string(self):
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diff changeset
398 return self.read()
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399
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diff changeset
400 def read(self, size=-1):
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parents:
diff changeset
401 string = self.encoder.read(size)
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parents:
diff changeset
402 self.bytes_read += len(string)
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diff changeset
403 self.callback(self)
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diff changeset
404 return string
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405
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406
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parents:
diff changeset
407 def encode_with(string, encoding):
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diff changeset
408 """Encoding ``string`` with ``encoding`` if necessary.
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409
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410 :param str string: If string is a bytes object, it will not encode it.
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411 Otherwise, this function will encode it with the provided encoding.
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412 :param str encoding: The encoding with which to encode string.
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413 :returns: encoded bytes object
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diff changeset
414 """
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415 if not (string is None or isinstance(string, bytes)):
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diff changeset
416 return string.encode(encoding)
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417 return string
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418
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419
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420 def readable_data(data, encoding):
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diff changeset
421 """Coerce the data to an object with a ``read`` method."""
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422 if hasattr(data, 'read'):
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423 return data
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424
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425 return CustomBytesIO(data, encoding)
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426
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427
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428 def total_len(o):
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diff changeset
429 if hasattr(o, '__len__'):
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diff changeset
430 return len(o)
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431
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432 if hasattr(o, 'len'):
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433 return o.len
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434
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435 if hasattr(o, 'fileno'):
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diff changeset
436 try:
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437 fileno = o.fileno()
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438 except io.UnsupportedOperation:
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439 pass
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440 else:
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441 return os.fstat(fileno).st_size
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442
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443 if hasattr(o, 'getvalue'):
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444 # e.g. BytesIO, cStringIO.StringIO
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diff changeset
445 return len(o.getvalue())
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446
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447
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448 @contextlib.contextmanager
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449 def reset(buffer):
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diff changeset
450 """Keep track of the buffer's current position and write to the end.
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451
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diff changeset
452 This is a context manager meant to be used when adding data to the buffer.
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453 It eliminates the need for every function to be concerned with the
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diff changeset
454 position of the cursor in the buffer.
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455 """
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456 original_position = buffer.tell()
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diff changeset
457 buffer.seek(0, 2)
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458 yield
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diff changeset
459 buffer.seek(original_position, 0)
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460
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461
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diff changeset
462 def coerce_data(data, encoding):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
463 """Ensure that every object's __len__ behaves uniformly."""
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464 if not isinstance(data, CustomBytesIO):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
465 if hasattr(data, 'getvalue'):
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466 return CustomBytesIO(data.getvalue(), encoding)
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diff changeset
467
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
468 if hasattr(data, 'fileno'):
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parents:
diff changeset
469 return FileWrapper(data)
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diff changeset
470
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diff changeset
471 if not hasattr(data, 'read'):
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diff changeset
472 return CustomBytesIO(data, encoding)
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parents:
diff changeset
473
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parents:
diff changeset
474 return data
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parents:
diff changeset
475
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diff changeset
476
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diff changeset
477 def to_list(fields):
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parents:
diff changeset
478 if hasattr(fields, 'items'):
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parents:
diff changeset
479 return list(fields.items())
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parents:
diff changeset
480 return list(fields)
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diff changeset
481
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diff changeset
482
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diff changeset
483 class Part(object):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
484 def __init__(self, headers, body):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
485 self.headers = headers
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
486 self.body = body
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diff changeset
487 self.headers_unread = True
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
488 self.len = len(self.headers) + total_len(self.body)
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diff changeset
489
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diff changeset
490 @classmethod
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parents:
diff changeset
491 def from_field(cls, field, encoding):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
492 """Create a part from a Request Field generated by urllib3."""
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
493 headers = encode_with(field.render_headers(), encoding)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
494 body = coerce_data(field.data, encoding)
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parents:
diff changeset
495 return cls(headers, body)
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diff changeset
496
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diff changeset
497 def bytes_left_to_write(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
498 """Determine if there are bytes left to write.
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diff changeset
499
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diff changeset
500 :returns: bool -- ``True`` if there are bytes left to write, otherwise
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
501 ``False``
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parents:
diff changeset
502 """
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parents:
diff changeset
503 to_read = 0
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
504 if self.headers_unread:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
505 to_read += len(self.headers)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
506
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parents:
diff changeset
507 return (to_read + total_len(self.body)) > 0
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parents:
diff changeset
508
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
509 def write_to(self, buffer, size):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
510 """Write the requested amount of bytes to the buffer provided.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
511
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diff changeset
512 The number of bytes written may exceed size on the first read since we
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
513 load the headers ambitiously.
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diff changeset
514
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diff changeset
515 :param CustomBytesIO buffer: buffer we want to write bytes to
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
516 :param int size: number of bytes requested to be written to the buffer
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diff changeset
517 :returns: int -- number of bytes actually written
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diff changeset
518 """
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parents:
diff changeset
519 written = 0
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parents:
diff changeset
520 if self.headers_unread:
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diff changeset
521 written += buffer.append(self.headers)
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parents:
diff changeset
522 self.headers_unread = False
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diff changeset
523
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
524 while total_len(self.body) > 0 and (size == -1 or written < size):
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parents:
diff changeset
525 amount_to_read = size
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
526 if size != -1:
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diff changeset
527 amount_to_read = size - written
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528 written += buffer.append(self.body.read(amount_to_read))
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529
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530 return written
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531
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532
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533 class CustomBytesIO(io.BytesIO):
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534 def __init__(self, buffer=None, encoding='utf-8'):
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535 buffer = encode_with(buffer, encoding)
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536 super(CustomBytesIO, self).__init__(buffer)
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537
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538 def _get_end(self):
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539 current_pos = self.tell()
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540 self.seek(0, 2)
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541 length = self.tell()
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542 self.seek(current_pos, 0)
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543 return length
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544
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545 @property
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546 def len(self):
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547 length = self._get_end()
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548 return length - self.tell()
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549
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550 def append(self, bytes):
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551 with reset(self):
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552 written = self.write(bytes)
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553 return written
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554
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555 def smart_truncate(self):
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556 to_be_read = total_len(self)
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557 already_read = self._get_end() - to_be_read
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558
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559 if already_read >= to_be_read:
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560 old_bytes = self.read()
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561 self.seek(0, 0)
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562 self.truncate()
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563 self.write(old_bytes)
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564 self.seek(0, 0) # We want to be at the beginning
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565
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566
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567 class FileWrapper(object):
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568 def __init__(self, file_object):
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569 self.fd = file_object
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570
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571 @property
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572 def len(self):
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573 return total_len(self.fd) - self.fd.tell()
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574
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575 def read(self, length=-1):
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576 return self.fd.read(length)
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577
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578
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579 class FileFromURLWrapper(object):
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580 """File from URL wrapper.
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581
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582 The :class:`FileFromURLWrapper` object gives you the ability to stream file
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583 from provided URL in chunks by :class:`MultipartEncoder`.
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584 Provide a stateless solution for streaming file from one server to another.
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585 You can use the :class:`FileFromURLWrapper` without a session or with
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586 a session as demonstated by the examples below:
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587
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588 .. code-block:: python
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589 # no session
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590
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591 import requests
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592 from requests_toolbelt import MultipartEncoder, FileFromURLWrapper
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593
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594 url = 'https://httpbin.org/image/png'
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595 streaming_encoder = MultipartEncoder(
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596 fields={
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597 'file': FileFromURLWrapper(url)
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598 }
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599 )
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600 r = requests.post(
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601 'https://httpbin.org/post', data=streaming_encoder,
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602 headers={'Content-Type': streaming_encoder.content_type}
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603 )
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diff changeset
604
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605 .. code-block:: python
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606 # using a session
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diff changeset
607
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608 import requests
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609 from requests_toolbelt import MultipartEncoder, FileFromURLWrapper
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diff changeset
610
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diff changeset
611 session = requests.Session()
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612 url = 'https://httpbin.org/image/png'
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613 streaming_encoder = MultipartEncoder(
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614 fields={
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615 'file': FileFromURLWrapper(url, session=session)
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616 }
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617 )
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618 r = session.post(
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619 'https://httpbin.org/post', data=streaming_encoder,
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620 headers={'Content-Type': streaming_encoder.content_type}
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621 )
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622
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623 """
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624
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625 def __init__(self, file_url, session=None):
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626 self.session = session or requests.Session()
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627 requested_file = self._request_for_file(file_url)
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628 self.len = int(requested_file.headers['content-length'])
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629 self.raw_data = requested_file.raw
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630
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631 def _request_for_file(self, file_url):
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632 """Make call for file under provided URL."""
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633 response = self.session.get(file_url, stream=True)
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634 content_length = response.headers.get('content-length', None)
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635 if content_length is None:
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636 error_msg = (
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637 "Data from provided URL {url} is not supported. Lack of "
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638 "content-length Header in requested file response.".format(
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639 url=file_url)
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640 )
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641 raise FileNotSupportedError(error_msg)
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642 elif not content_length.isdigit():
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643 error_msg = (
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644 "Data from provided URL {url} is not supported. content-length"
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645 " header value is not a digit.".format(url=file_url)
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646 )
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647 raise FileNotSupportedError(error_msg)
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648 return response
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649
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650 def read(self, chunk_size):
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651 """Read file in chunks."""
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652 chunk_size = chunk_size if chunk_size >= 0 else self.len
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653 chunk = self.raw_data.read(chunk_size) or b''
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654 self.len -= len(chunk) if chunk else 0 # left to read
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655 return chunk