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downloadutils
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__init__.py
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__pycache__
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stream.py
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tee.py
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Editing: tee.py
"""Tee function implementations.""" import io _DEFAULT_CHUNKSIZE = 65536 __all__ = ['tee', 'tee_to_file', 'tee_to_bytearray'] def _tee(response, callback, chunksize, decode_content): for chunk in response.raw.stream(amt=chunksize, decode_content=decode_content): callback(chunk) yield chunk def tee(response, fileobject, chunksize=_DEFAULT_CHUNKSIZE, decode_content=None): """Stream the response both to the generator and a file. This will stream the response body while writing the bytes to ``fileobject``. Example usage: .. code-block:: python resp = requests.get(url, stream=True) with open('save_file', 'wb') as save_file: for chunk in tee(resp, save_file): # do stuff with chunk .. code-block:: python import io resp = requests.get(url, stream=True) fileobject = io.BytesIO() for chunk in tee(resp, fileobject): # do stuff with chunk :param response: Response from requests. :type response: requests.Response :param fileobject: Writable file-like object. :type fileobject: file, io.BytesIO :param int chunksize: (optional), Size of chunk to attempt to stream. :param bool decode_content: (optional), If True, this will decode the compressed content of the response. :raises: TypeError if the fileobject wasn't opened with the right mode or isn't a BytesIO object. """ # We will be streaming the raw bytes from over the wire, so we need to # ensure that writing to the fileobject will preserve those bytes. On # Python3, if the user passes an io.StringIO, this will fail, so we need # to check for BytesIO instead. if not ('b' in getattr(fileobject, 'mode', '') or isinstance(fileobject, io.BytesIO)): raise TypeError('tee() will write bytes directly to this fileobject' ', it must be opened with the "b" flag if it is a file' ' or inherit from io.BytesIO.') return _tee(response, fileobject.write, chunksize, decode_content) def tee_to_file(response, filename, chunksize=_DEFAULT_CHUNKSIZE, decode_content=None): """Stream the response both to the generator and a file. This will open a file named ``filename`` and stream the response body while writing the bytes to the opened file object. Example usage: .. code-block:: python resp = requests.get(url, stream=True) for chunk in tee_to_file(resp, 'save_file'): # do stuff with chunk :param response: Response from requests. :type response: requests.Response :param str filename: Name of file in which we write the response content. :param int chunksize: (optional), Size of chunk to attempt to stream. :param bool decode_content: (optional), If True, this will decode the compressed content of the response. """ with open(filename, 'wb') as fd: for chunk in tee(response, fd, chunksize, decode_content): yield chunk def tee_to_bytearray(response, bytearr, chunksize=_DEFAULT_CHUNKSIZE, decode_content=None): """Stream the response both to the generator and a bytearray. This will stream the response provided to the function, add them to the provided :class:`bytearray` and yield them to the user. .. note:: This uses the :meth:`bytearray.extend` by default instead of passing the bytearray into the ``readinto`` method. Example usage: .. code-block:: python b = bytearray() resp = requests.get(url, stream=True) for chunk in tee_to_bytearray(resp, b): # do stuff with chunk :param response: Response from requests. :type response: requests.Response :param bytearray bytearr: Array to add the streamed bytes to. :param int chunksize: (optional), Size of chunk to attempt to stream. :param bool decode_content: (optional), If True, this will decode the compressed content of the response. """ if not isinstance(bytearr, bytearray): raise TypeError('tee_to_bytearray() expects bytearr to be a ' 'bytearray') return _tee(response, bytearr.extend, chunksize, decode_content)
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