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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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VtV ;t# ) r� i� c �b <� \ SV ` V4 Wn W0n W@n WPn W`n R# )a� Submit GetObjectJobs to fulfill a download file request
:param transfer_config: Configuration for transfers.
:param client_factory: ClientFactory for creating S3 clients.
:param transfer_monitor: Monitor for notifying and retrieving state
of transfer.
:param osutil: OSUtils object to use for os-related behavior when
performing the transfer.
:param download_request_queue: Queue to retrieve download file
requests.
:param worker_queue: Queue to submit GetObjectJobs for workers
to perform.
N)r) r) r8 rC r= r; r< )r( r� r� r� r� r� r� r+ s &&&&&&&�r r) �GetObjectSubmitter.__init__� s/ �� �, ��� �(� /� �!1� � � �'=�$� )�r! c � � V P P 4 pV\ 8X d \ P R4 R# V P V4 KQ \ dp p\ P RTTR R7 T P P TP T4 T P P TP 4 Rp?K� Rp?ii ; i)Tz#Submitter shutdown signal received.NzFException caught when submitting jobs for download file request %s: %s��exc_info) r; r� r� rT rU �_submit_get_object_jobs� ExceptionrC r� rK r� )r( rX �es & r r. �GetObjectSubmitter._do_run s� � ��$(�$@�$@�$D�$D�$F� !�$��7�� � � B�C��
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temp_filenames && r r< �*GetObjectSubmitter._submit_get_object_jobs0 sZ � ��~�~� 3�4�� �0�0�1F�M�
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� "r! c �N � V P P \ R/ VB 4 R # )Nr )r< rV r )r( �get_object_job_kwargss &,r rW �)GetObjectSubmitter._submit_get_object_jobt s � � ��� � �|� D�.C� D�Er! c �j � \ P R VV4 V P P W4 R# )z3Notifying %s job(s) to complete for transfer_id %s.N)rT rU rC r )r( rK r� s &&&r rV �+GetObjectSubmitter._notify_jobs_to_completew s0 � �� � � A� � �
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R tVtV ;t# )
r� i� c �V <� \ SV ` V4 Wn W n W0n W@n R# )a� Fulfills GetObjectJobs
Downloads the S3 object, writes it to the specified file, and
renames the file to its final location if it completes the final
job for a particular transfer.
:param queue: Queue for retrieving GetObjectJob's
:param client_factory: ClientFactory for creating S3 clients
:param transfer_monitor: Monitor for notifying
:param osutil: OSUtils object to use for os-related behavior when
performing the transfer.
N)r) r) �_queuer7 rC r= )r( r� r� r� r� r+ s &&&&&�r r) �GetObjectWorker.__init__� s( �� � ��� �(�� � -� �!1� � � r! c �* � V P P 4 pV\ 8X d \ P R4 R# V P
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P VP 4 p\ P RVVP 4 V' d K� V P VP VP VP 4 EK )Tz Worker shutdown signal received.NzBSkipping get object job %s because there was a previous exception.z%%s jobs remaining for transfer_id %s.)
ri r� r� rT rU rC r� rK �_run_get_object_jobr �_finalize_downloadrG rN )r( �job� remainings & r r. �GetObjectWorker._do_run� s� � ���+�+�/�/�#�C��o�%�� � � ?�@���)�)�7�7����H�H��(�(��-�� � �!���
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R 7 R# \ dK p\ P RTTRR7 T P P TP T4 Rp?R# Rp?ii ; i))rL rM rG rO rU zBException caught when downloading object for get object job %s: %sTr: N) �_do_get_objectrL rM rG rO rU r= rT rU rC r� rK )r( rn r> s && r rl �#GetObjectWorker._run_get_object_job� s� � � H� � � ��z�z��G�G� !� /� /� �>�>��z�z�
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