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Getting Started
===============

The :class:`ProcessPoolDownloader` can be used to download a single file by
calling :meth:`ProcessPoolDownloader.download_file`:

.. code:: python

     from s3transfer.processpool import ProcessPoolDownloader

     with ProcessPoolDownloader() as downloader:
          downloader.download_file('mybucket', 'mykey', 'myfile')


This snippet downloads the S3 object located in the bucket ``mybucket`` at the
key ``mykey`` to the local file ``myfile``. Any errors encountered during the
transfer are not propagated. To determine if a transfer succeeded or
failed, use the `Futures`_ interface.


The :class:`ProcessPoolDownloader` can be used to download multiple files as
well:

.. code:: python

     from s3transfer.processpool import ProcessPoolDownloader

     with ProcessPoolDownloader() as downloader:
          downloader.download_file('mybucket', 'mykey', 'myfile')
          downloader.download_file('mybucket', 'myotherkey', 'myotherfile')


When running this snippet, the downloading of ``mykey`` and ``myotherkey``
happen in parallel. The first ``download_file`` call does not block the
second ``download_file`` call. The snippet blocks when exiting
the context manager and blocks until both downloads are complete.

Alternatively, the ``ProcessPoolDownloader`` can be instantiated
and explicitly be shutdown using :meth:`ProcessPoolDownloader.shutdown`:

.. code:: python

     from s3transfer.processpool import ProcessPoolDownloader

     downloader = ProcessPoolDownloader()
     downloader.download_file('mybucket', 'mykey', 'myfile')
     downloader.download_file('mybucket', 'myotherkey', 'myotherfile')
     downloader.shutdown()


For this code snippet, the call to ``shutdown`` blocks until both
downloads are complete.


Additional Parameters
=====================

Additional parameters can be provided to the ``download_file`` method:

* ``extra_args``: A dictionary containing any additional client arguments
  to include in the
  `GetObject <https://botocore.amazonaws.com/v1/documentation/api/latest/reference/services/s3.html#S3.Client.get_object>`_
  API request. For example:

  .. code:: python

     from s3transfer.processpool import ProcessPoolDownloader

     with ProcessPoolDownloader() as downloader:
          downloader.download_file(
               'mybucket', 'mykey', 'myfile',
               extra_args={'VersionId': 'myversion'})


* ``expected_size``: By default, the downloader will make a HeadObject
  call to determine the size of the object. To opt-out of this additional
  API call, you can provide the size of the object in bytes:

  .. code:: python

     from s3transfer.processpool import ProcessPoolDownloader

     MB = 1024 * 1024
     with ProcessPoolDownloader() as downloader:
          downloader.download_file(
               'mybucket', 'mykey', 'myfile', expected_size=2 * MB)


Futures
=======

When ``download_file`` is called, it immediately returns a
:class:`ProcessPoolTransferFuture`. The future can be used to poll the state
of a particular transfer. To get the result of the download,
call :meth:`ProcessPoolTransferFuture.result`. The method blocks
until the transfer completes, whether it succeeds or fails. For example:

.. code:: python

     from s3transfer.processpool import ProcessPoolDownloader

     with ProcessPoolDownloader() as downloader:
          future = downloader.download_file('mybucket', 'mykey', 'myfile')
          print(future.result())


If the download succeeds, the future returns ``None``:

.. code:: python

     None


If the download fails, the exception causing the failure is raised. For
example, if ``mykey`` did not exist, the following error would be raised


.. code:: python

     botocore.exceptions.ClientError: An error occurred (404) when calling the HeadObject operation: Not Found


.. note::

    :meth:`ProcessPoolTransferFuture.result` can only be called while the
    ``ProcessPoolDownloader`` is running (e.g. before calling ``shutdown`` or
    inside the context manager).


Process Pool Configuration
==========================

By default, the downloader has the following configuration options:

* ``multipart_threshold``: The threshold size for performing ranged downloads
  in bytes. By default, ranged downloads happen for S3 objects that are
  greater than or equal to 8 MB in size.

* ``multipart_chunksize``: The size of each ranged download in bytes. By
  default, the size of each ranged download is 8 MB.

* ``max_request_processes``: The maximum number of processes used to download
  S3 objects. By default, the maximum is 10 processes.


To change the default configuration, use the :class:`ProcessTransferConfig`:

.. code:: python

     from s3transfer.processpool import ProcessPoolDownloader
     from s3transfer.processpool import ProcessTransferConfig

     config = ProcessTransferConfig(
          multipart_threshold=64 * 1024 * 1024,  # 64 MB
          max_request_processes=50
     )
     downloader = ProcessPoolDownloader(config=config)


Client Configuration
====================

The process pool downloader creates ``botocore`` clients on your behalf. In
order to affect how the client is created, pass the keyword arguments
that would have been used in the :meth:`botocore.Session.create_client` call:

.. code:: python


     from s3transfer.processpool import ProcessPoolDownloader
     from s3transfer.processpool import ProcessTransferConfig

     downloader = ProcessPoolDownloader(
          client_kwargs={'region_name': 'us-west-2'})


This snippet ensures that all clients created by the ``ProcessPoolDownloader``
are using ``us-west-2`` as their region.

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