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annotate planemo/lib/python3.7/site-packages/requests_toolbelt/downloadutils/tee.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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1 """Tee function implementations."""
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2 import io
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3
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4 _DEFAULT_CHUNKSIZE = 65536
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5
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6 __all__ = ['tee', 'tee_to_file', 'tee_to_bytearray']
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7
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8
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9 def _tee(response, callback, chunksize, decode_content):
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10 for chunk in response.raw.stream(amt=chunksize,
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11 decode_content=decode_content):
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12 callback(chunk)
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13 yield chunk
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14
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15
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16 def tee(response, fileobject, chunksize=_DEFAULT_CHUNKSIZE,
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17 decode_content=None):
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18 """Stream the response both to the generator and a file.
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19
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20 This will stream the response body while writing the bytes to
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21 ``fileobject``.
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22
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23 Example usage:
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24
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25 .. code-block:: python
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26
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27 resp = requests.get(url, stream=True)
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28 with open('save_file', 'wb') as save_file:
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29 for chunk in tee(resp, save_file):
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30 # do stuff with chunk
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31
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32 .. code-block:: python
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33
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34 import io
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35
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36 resp = requests.get(url, stream=True)
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37 fileobject = io.BytesIO()
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38
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39 for chunk in tee(resp, fileobject):
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40 # do stuff with chunk
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41
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42 :param response: Response from requests.
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43 :type response: requests.Response
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44 :param fileobject: Writable file-like object.
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45 :type fileobject: file, io.BytesIO
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46 :param int chunksize: (optional), Size of chunk to attempt to stream.
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47 :param bool decode_content: (optional), If True, this will decode the
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48 compressed content of the response.
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49 :raises: TypeError if the fileobject wasn't opened with the right mode
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50 or isn't a BytesIO object.
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51 """
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52 # We will be streaming the raw bytes from over the wire, so we need to
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53 # ensure that writing to the fileobject will preserve those bytes. On
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54 # Python3, if the user passes an io.StringIO, this will fail, so we need
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55 # to check for BytesIO instead.
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56 if not ('b' in getattr(fileobject, 'mode', '') or
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57 isinstance(fileobject, io.BytesIO)):
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58 raise TypeError('tee() will write bytes directly to this fileobject'
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59 ', it must be opened with the "b" flag if it is a file'
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60 ' or inherit from io.BytesIO.')
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61
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62 return _tee(response, fileobject.write, chunksize, decode_content)
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63
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64
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65 def tee_to_file(response, filename, chunksize=_DEFAULT_CHUNKSIZE,
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66 decode_content=None):
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67 """Stream the response both to the generator and a file.
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68
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69 This will open a file named ``filename`` and stream the response body
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70 while writing the bytes to the opened file object.
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71
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72 Example usage:
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73
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74 .. code-block:: python
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75
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76 resp = requests.get(url, stream=True)
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77 for chunk in tee_to_file(resp, 'save_file'):
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78 # do stuff with chunk
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79
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80 :param response: Response from requests.
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81 :type response: requests.Response
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82 :param str filename: Name of file in which we write the response content.
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83 :param int chunksize: (optional), Size of chunk to attempt to stream.
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84 :param bool decode_content: (optional), If True, this will decode the
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85 compressed content of the response.
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86 """
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87 with open(filename, 'wb') as fd:
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88 for chunk in tee(response, fd, chunksize, decode_content):
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89 yield chunk
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90
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91
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92 def tee_to_bytearray(response, bytearr, chunksize=_DEFAULT_CHUNKSIZE,
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93 decode_content=None):
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94 """Stream the response both to the generator and a bytearray.
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95
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96 This will stream the response provided to the function, add them to the
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97 provided :class:`bytearray` and yield them to the user.
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98
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99 .. note::
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100
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101 This uses the :meth:`bytearray.extend` by default instead of passing
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102 the bytearray into the ``readinto`` method.
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103
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104 Example usage:
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105
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106 .. code-block:: python
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107
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108 b = bytearray()
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109 resp = requests.get(url, stream=True)
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110 for chunk in tee_to_bytearray(resp, b):
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111 # do stuff with chunk
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112
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113 :param response: Response from requests.
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114 :type response: requests.Response
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115 :param bytearray bytearr: Array to add the streamed bytes to.
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116 :param int chunksize: (optional), Size of chunk to attempt to stream.
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117 :param bool decode_content: (optional), If True, this will decode the
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118 compressed content of the response.
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119 """
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120 if not isinstance(bytearr, bytearray):
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121 raise TypeError('tee_to_bytearray() expects bytearr to be a '
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122 'bytearray')
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123 return _tee(response, bytearr.extend, chunksize, decode_content)