Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/requests_toolbelt/downloadutils/stream.py @ 0:26e78fe6e8c4 draft

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"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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1 # -*- coding: utf-8 -*-
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2 """Utilities for dealing with streamed requests."""
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3 import collections
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4 import os.path
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5 import re
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6
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7 from .. import exceptions as exc
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8
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9 # Regular expressions stolen from werkzeug/http.py
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10 # cd2c97bb0a076da2322f11adce0b2731f9193396 L62-L64
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11 _QUOTED_STRING_RE = r'"[^"\\]*(?:\\.[^"\\]*)*"'
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12 _OPTION_HEADER_PIECE_RE = re.compile(
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13 r';\s*(%s|[^\s;=]+)\s*(?:=\s*(%s|[^;]+))?\s*' % (_QUOTED_STRING_RE,
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14 _QUOTED_STRING_RE)
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15 )
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16 _DEFAULT_CHUNKSIZE = 512
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17
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18
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19 def _get_filename(content_disposition):
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20 for match in _OPTION_HEADER_PIECE_RE.finditer(content_disposition):
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21 k, v = match.groups()
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22 if k == 'filename':
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23 # ignore any directory paths in the filename
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24 return os.path.split(v)[1]
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25 return None
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26
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27
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28 def get_download_file_path(response, path):
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29 """
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30 Given a response and a path, return a file path for a download.
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31
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32 If a ``path`` parameter is a directory, this function will parse the
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33 ``Content-Disposition`` header on the response to determine the name of the
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34 file as reported by the server, and return a file path in the specified
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35 directory.
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36
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37 If ``path`` is empty or None, this function will return a path relative
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38 to the process' current working directory.
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39
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40 If path is a full file path, return it.
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41
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42 :param response: A Response object from requests
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43 :type response: requests.models.Response
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44 :param str path: Directory or file path.
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45 :returns: full file path to download as
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46 :rtype: str
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47 :raises: :class:`requests_toolbelt.exceptions.StreamingError`
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48 """
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49 path_is_dir = path and os.path.isdir(path)
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50
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51 if path and not path_is_dir:
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52 # fully qualified file path
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53 filepath = path
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54 else:
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55 response_filename = _get_filename(
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56 response.headers.get('content-disposition', '')
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57 )
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58 if not response_filename:
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59 raise exc.StreamingError('No filename given to stream response to')
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60
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61 if path_is_dir:
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62 # directory to download to
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63 filepath = os.path.join(path, response_filename)
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64 else:
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65 # fallback to downloading to current working directory
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66 filepath = response_filename
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67
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68 return filepath
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69
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70
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71 def stream_response_to_file(response, path=None, chunksize=_DEFAULT_CHUNKSIZE):
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72 """Stream a response body to the specified file.
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73
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74 Either use the ``path`` provided or use the name provided in the
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75 ``Content-Disposition`` header.
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76
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77 .. warning::
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78
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79 If you pass this function an open file-like object as the ``path``
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80 parameter, the function will not close that file for you.
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81
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82 .. warning::
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83
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84 This function will not automatically close the response object
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85 passed in as the ``response`` parameter.
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86
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87 If a ``path`` parameter is a directory, this function will parse the
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88 ``Content-Disposition`` header on the response to determine the name of the
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89 file as reported by the server, and return a file path in the specified
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90 directory. If no ``path`` parameter is supplied, this function will default
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91 to the process' current working directory.
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92
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93 .. code-block:: python
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94
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95 import requests
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96 from requests_toolbelt import exceptions
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97 from requests_toolbelt.downloadutils import stream
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98
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99 r = requests.get(url, stream=True)
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100 try:
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101 filename = stream.stream_response_to_file(r)
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102 except exceptions.StreamingError as e:
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103 # The toolbelt could not find the filename in the
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104 # Content-Disposition
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105 print(e.message)
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106
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107 You can also specify the filename as a string. This will be passed to
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108 the built-in :func:`open` and we will read the content into the file.
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109
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110 .. code-block:: python
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111
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112 import requests
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113 from requests_toolbelt.downloadutils import stream
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114
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115 r = requests.get(url, stream=True)
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116 filename = stream.stream_response_to_file(r, path='myfile')
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117
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118 If the calculated download file path already exists, this function will
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119 raise a StreamingError.
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120
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121 Instead, if you want to manage the file object yourself, you need to
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122 provide either a :class:`io.BytesIO` object or a file opened with the
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123 `'b'` flag. See the two examples below for more details.
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124
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125 .. code-block:: python
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126
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127 import requests
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128 from requests_toolbelt.downloadutils import stream
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129
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130 with open('myfile', 'wb') as fd:
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131 r = requests.get(url, stream=True)
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132 filename = stream.stream_response_to_file(r, path=fd)
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133
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134 print('{0} saved to {1}'.format(url, filename))
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135
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136 .. code-block:: python
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137
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138 import io
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139 import requests
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140 from requests_toolbelt.downloadutils import stream
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141
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142 b = io.BytesIO()
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143 r = requests.get(url, stream=True)
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144 filename = stream.stream_response_to_file(r, path=b)
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145 assert filename is None
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146
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147 :param response: A Response object from requests
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148 :type response: requests.models.Response
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149 :param path: *(optional)*, Either a string with the path to the location
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150 to save the response content, or a file-like object expecting bytes.
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151 :type path: :class:`str`, or object with a :meth:`write`
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152 :param int chunksize: (optional), Size of chunk to attempt to stream
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153 (default 512B).
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154 :returns: The name of the file, if one can be determined, else None
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155 :rtype: str
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156 :raises: :class:`requests_toolbelt.exceptions.StreamingError`
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157 """
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158 pre_opened = False
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159 fd = None
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160 filename = None
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161 if path and isinstance(getattr(path, 'write', None), collections.Callable):
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162 pre_opened = True
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163 fd = path
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164 filename = getattr(fd, 'name', None)
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165 else:
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166 filename = get_download_file_path(response, path)
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167 if os.path.exists(filename):
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168 raise exc.StreamingError("File already exists: %s" % filename)
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169 fd = open(filename, 'wb')
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170
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171 for chunk in response.iter_content(chunk_size=chunksize):
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172 fd.write(chunk)
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173
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174 if not pre_opened:
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175 fd.close()
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176
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177 return filename