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_producer_helpers.cpython-312.pyc
� Ϫ�fE � � � U d Z ddlmZ ddlmZ ddlmZ ddlmZ ddl m Z ddl m Z g Z ee ed< ee� G d � d � � Zy ) z% Helpers for working with producers. � )�List)� implementer)� IPushProducer)� cooperate)�log)�safe_str�__all__c �> � e Zd ZdZdZd� Zd� Zd� Zd� Zd� Z d� Z d � Z y ) � _PullToPusha� An adapter that converts a non-streaming to a streaming producer. Because of limitations of the producer API, this adapter requires the cooperation of the consumer. When the consumer's C{registerProducer} is called with a non-streaming producer, it must wrap it with L{_PullToPush} and then call C{startStreaming} on the resulting object. When the consumer's C{unregisterProducer} is called, it must call C{stopStreaming} on the L{_PullToPush} instance. If the underlying producer throws an exception from C{resumeProducing}, the producer will be unregistered from the consumer. @ivar _producer: the underling non-streaming producer. @ivar _consumer: the consumer with which the underlying producer was registered. @ivar _finished: C{bool} indicating whether the producer has finished. @ivar _coopTask: the result of calling L{cooperate}, the task driving the streaming producer. Fc � � || _ || _ y )N)� _producer� _consumer)�self� pullProducer�consumers �D/usr/lib/python3/dist-packages/twisted/internet/_producer_helpers.py�__init__z_PullToPush.__init__2 s � �%���!��� c # � K � | j j � d�� � # t $ r� t j dt | j � �d�� | j j � nC# t $ r7 t j dt | j � �d�� d| _ Y Y yw xY wY ��w xY w�w)z� A generator that calls C{resumeProducing} on the underlying producer forever. If C{resumeProducing} throws an exception, the producer is unregistered, which should result in streaming stopping. TNz# failed, producing will be stopped:z failed to unregister producer:) r �resumeProducing� BaseExceptionr �errr r �unregisterProducer� _finished�r s r �_pullz_PullToPush._pull6 s� � �� � � ����.�.�0�* �J�/ �� !� ����� ����/�2�� ��N�N�5�5�7�� %� � �G�G� �#�D�N�N�3�6�� &*�D�N�� �� 8� �sO �B>�$ �B>�5B;�A5�4B;�5<B5�1B;�2B>�4B5�5B;�8B>�:B;�;B>c �@ � t | j � � | _ y)z� This should be called by the consumer when the producer is registered. Start streaming data to the consumer. N)r r � _coopTaskr s r �startStreamingz_PullToPush.startStreamingW s � � #�4�:�:�<�0��r c �` � | j ryd| _ | j j � y)z� This should be called by the consumer when the producer is unregistered. Stop streaming data to the consumer. NT)r r �stopr s r � stopStreamingz_PullToPush.stopStreaming_ s% � � �>�>� � ��� ����� r c �8 � | j j � y)z7 @see: C{IPushProducer.pauseProducing} N)r �pauser s r �pauseProducingz_PullToPush.pauseProducingk s � � ��� � � r c �8 � | j j � y)z8 @see: C{IPushProducer.resumeProducing} N)r �resumer s r r z_PullToPush.resumeProducingq s � � ��� � � r c �X � | j � | j j � y)z6 @see: C{IPushProducer.stopProducing} N)r" r � stopProducingr s r r) z_PullToPush.stopProducingw s � � ��� � ���$�$�&r N) �__name__� __module__� __qualname__�__doc__r r r r r" r% r r) � r r r r s2 � ��0 �I�"� �B1� � � � 'r r N)r- �typingr �zope.interfacer �twisted.internet.interfacesr �twisted.internet.taskr �twisted.pythonr �twisted.python.reflectr r �str�__annotations__r r. r r �<module>r7 sO �� � � &� 5� +� � +� ���c�� � �]��e'� e'� �e'r
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