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dd� Z dd� Z dS )�DownloadOutputManagera� Base manager class for handling various types of files for downloads
This class is typically used for the DownloadSubmissionTask class to help
determine the following:
* Provides the fileobj to write to downloads to
* Get a task to complete once everything downloaded has been written
The answers/implementations differ for the various types of file outputs
that may be accepted. All implementations must subclass and override
public methods from this class.
c C s || _ || _|| _d S )N)�_osutil�_transfer_coordinator� _io_executor)�self�osutil�transfer_coordinator� io_executor� r �9/tmp/pip-build-t4pk6ic9/s3transfer/s3transfer/download.py�__init__4 s z DownloadOutputManager.__init__c C s t d��dS )ae Determines if the target for the download is compatible with manager
:param download_target: The target for which the upload will write
data to.
:param osutil: The os utility to be used for the transfer
:returns: True if the manager can handle the type of target specified
otherwise returns False.
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is_compatible9 s z#DownloadOutputManager.is_compatiblec C s dS )z�Get the tag (if any) to associate all GetObjectTasks
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Nr )r r r r �get_download_task_tagG s z+DownloadOutputManager.get_download_task_tagc C s t d��dS )a Get file-like object to use for io writes in the io executor
:type transfer_future: s3transfer.futures.TransferFuture
:param transfer_future: The future associated with upload request
returns: A file-like object to write to
z*must implement get_fileobj_for_io_writes()N)r )r �transfer_futurer r r �get_fileobj_for_io_writesO s z/DownloadOutputManager.get_fileobj_for_io_writesc C s | j j| j| j|||�� dS )a Queue IO write for submission to the IO executor.
This method accepts an IO executor and information about the
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This method may defer submission to the IO executor if necessary.
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for it to run.
:type fileobj: file-like object
:param fileobj: The file-like object to write to
:type data: bytes
:param data: The data to write out
:type offset: integer
:param offset: The offset to write the data to in the file-like object
:returns: An IO task to be used to write data to a file-like object
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z'DownloadOutputManager.get_io_write_taskc C s t d��dS )a� Get the final io task to complete the download
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all done callbacks can be run.
:rtype: s3transfer.tasks.Task
:returns: A final task to completed in the io executor
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d� Z dS )�DownloadSubmissionTaskz/Task for submitting tasks to execute a downloadc C sL t tttg}|jjj}x |D ]}|j||�r |S q W td|t |�f ��dS )a� Retrieves a class for managing output for a download
:type transfer_future: s3transfer.futures.TransferFuture
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:rtype: class of DownloadOutputManager
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:param client: The client associated with the transfer manager
:type config: s3transfer.manager.TransferConfig
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:type osutil: s3transfer.utils.OSUtil
:param osutil: The os utility associated to the transfer manager
:type request_executor: s3transfer.futures.BoundedExecutor
:param request_executor: The request executor associated with the
transfer manager
:type io_executor: s3transfer.futures.BoundedExecutor
:param io_executor: The io executor associated with the
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:type transfer_future: s3transfer.futures.TransferFuture
:param transfer_future: The transfer future associated with the
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| ��dS )a� Downloads an object and places content into io queue
:param client: The client to use when calling GetObject
:param bucket: The bucket to download from
:param key: The key to download from
:param fileobj: The file handle to write content to
:param exta_args: Any extra arguements to include in GetObject request
:param callbacks: List of progress callbacks to invoke on download
:param max_attempts: The number of retries to do when downloading
:param download_output_manager: The download output manager associated
with the current download.
:param io_chunksize: The size of each io chunk to read from the
download stream and queue in the io queue.
:param start_index: The location in the file to start writing the
content of the key to.
:param bandwidth_limiter: The bandwidth limiter to use when throttling
the downloading of data in streams.
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;r~ c @ s e Zd ZdZdd� ZdS )rt a GetObjectTask that immediately writes to the provided file object
This is useful for downloads where it is known only one thread is
downloading the object so there is no reason to go through the
overhead of using an IO queue and executor.
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zIOStreamingWriteTask._mainN)r4 r5 r6 r7 r� r r r r rW ? s rW c @ s e Zd ZdZdd� ZdS )rF a A task to rename a temporary file to its final filename
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c C s |j � |j|j|� d S )N)r0 Z rename_file�name)r r% rD r r r r r� W s zIORenameFileTask._mainN)r4 r5 r6 r7 r� r r r r rF O s rF c @ s e Zd ZdZdd� ZdS )rZ ziA task to close out a file once the download is complete.
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always be the last task.
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c C s g | _ t� | _d| _d S )Nr )�_writes�set�_pending_offsets� _next_offset)r r r r r � s zDeferQueue.__init__c C s� || j k rg S g }|| jkr g S tj| j||f� | jj|� xh| jr�| jd d | j kr�tj| j�}|j|d |d d�� | jj|d � | j t |d �7 _ q@W |S )a� Request any available writes given new incoming data.
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offset associated with the data. If that new data unlocks
any contiguous writes that can now be submitted, this
method will return all applicable writes.
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make two method calls (put(), get()) which acquires a lock
each method call.
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