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� h f1. � @ sq d Z d d l Z d d l m Z Gd d � d e j � Z Gd d � d � Z Gd d � d � Z d d � Z d S) a� A class supporting chat-style (command/response) protocols. This class adds support for 'chat' style protocols - where one side sends a 'command', and the other sends a response (examples would be the common internet protocols - smtp, nntp, ftp, etc..). The handle_read() method looks at the input stream for the current 'terminator' (usually '\r\n' for single-line responses, '\r\n.\r\n' for multi-line output), calling self.found_terminator() on its receipt. for example: Say you build an async nntp client using this class. At the start of the connection, you'll have self.terminator set to '\r\n', in order to process the single-line greeting. Just before issuing a 'LIST' command you'll set it to '\r\n.\r\n'. The output of the LIST command will be accumulated (using your own 'collect_incoming_data' method) up to the terminator, and then control will be returned to you - by calling your self.found_terminator() method. � N)�dequec @ s e Z d Z d Z d Z d Z d Z d Z d d d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d! � Z d" d# � Z d$ d% � Z d& d' � Z d S)(� async_chatz�This is an abstract class. You must derive from this class, and add the two methods collect_incoming_data() and found_terminator()i r zlatin-1Nc C s8 d | _ g | _ t � | _ t j j | | | � d S)N� )� ac_in_buffer�incomingr � producer_fifo�asyncore� dispatcher�__init__)�selfZsock�map� r �-/opt/alt/python34/lib64/python3.4/asynchat.pyr C s zasync_chat.__init__c C s t d � � d S)Nz must be implemented in subclass)�NotImplementedError)r �datar r r �collect_incoming_dataQ s z async_chat.collect_incoming_datac C s | j j | � d S)N)r �append)r r r r r �_collect_incoming_dataT s z!async_chat._collect_incoming_datac C s& d j | j � } | j d d � =| S)Nr )�joinr )r �dr r r � _get_dataW s zasync_chat._get_datac C s t d � � d S)Nz must be implemented in subclass)r )r r r r �found_terminator\ s zasync_chat.found_terminatorc C sd t | t � r- | j r- t | | j � } n* t | t � rW | d k rW t d � � n | | _ d S)zdSet the input delimiter. Can be a fixed string of any length, an integer, or None. r z-the number of received bytes must be positiveN)� isinstance�str� use_encoding�bytes�encoding�int� ValueError� terminator)r Ztermr r r �set_terminator_ s zasync_chat.set_terminatorc C s | j S)N)r )r r r r �get_terminatorj s zasync_chat.get_terminatorc C sr y | j | j � } WnH t k r. d SYn3 t k r` } z | j � d SWYd d } ~ Xn Xt | t � r� | j r� t t | j � } n | j | | _ x�| j rmt | j � } | j � } | s� | j | j � d | _ q� t | t � rz| } | | k r4| j | j � d | _ | j | | _ qj| j | j d | � � | j | d � | _ d | _ | j � q� t | � } | j j | � } | d k r�| d k r�| j | j d | � � n | j | | d � | _ | j � q� t | j | � } | rQ| | k rM| j | j d | � � | j | d � | _ n Pq� | j | j � d | _ q� Wd S)Nr r � ���)Zrecv�ac_in_buffer_size�BlockingIOError�OSError� handle_errorr r r r r r �lenr! r r r r �find�find_prefix_at_end)r r ZwhyZlbr �nZterminator_len�indexr r r � handle_readr sR zasync_chat.handle_readc C s | j � d S)N)� initiate_send)r r r r � handle_write� s zasync_chat.handle_writec C s | j � d S)N)�close)r r r r � handle_close� s zasync_chat.handle_closec C s� t | t t t f � s0 t d t | � � � n | j } t | � | k r� xQ t d t | � | � D]$ } | j j | | | | � � qd Wn | j j | � | j � d S)Nz#data argument must be byte-ish (%r)r ) r r � bytearray� memoryview� TypeError�type�ac_out_buffer_sizer( �ranger r r. )r r Zsabs�ir r r �push� s %zasync_chat.pushc C s | j j | � | j � d S)N)r r r. )r Zproducerr r r �push_with_producer� s z async_chat.push_with_producerc C s d S)z4predicate for inclusion in the readable for select()r" r )r r r r �readable� s zasync_chat.readablec C s | j p | j S)z4predicate for inclusion in the writable for select())r � connected)r r r r �writable� s zasync_chat.writablec C s | j j d � d S)zAautomatically close this channel once the outgoing queue is emptyN)r r )r r r r �close_when_done� s zasync_chat.close_when_donec C sp xi| j rk| j rk| j d } | sO | j d =| d k rO | j � d Sn | j } y | d | � } WnD t k r� | j � } | r� | j j | � n | j d =w Yn Xt | t � r� | j r� t | | j � } n y | j | � } Wn t k r| j � d SYn X| rg| t | � k s@| t | � k rZ| | d � | j d <qg| j d =n d SWd S)Nr )r r< r1 r6 r4 �more� appendleftr r r r r �sendr& r' r( )r �firstZobsr Znum_sentr r r r. � s8 $ zasync_chat.initiate_sendc C s* d | _ | j d d � =| j j � d S)Nr )r r r �clear)r r r r �discard_buffers s zasync_chat.discard_buffers)�__name__� __module__� __qualname__�__doc__r$ r6 r r r r r r r r r! r- r/ r1 r9 r: r; r= r> r. rD r r r r r 4 s, H (r c @ s+ e Z d Z d d d � Z d d � Z d S)�simple_produceri c C s | | _ | | _ d S)N)r � buffer_size)r r rJ r r r r s zsimple_producer.__init__c C se t | j � | j k rK | j d | j � } | j | j d � | _ | S| j } d | _ | Sd S)Nr )r( r rJ )r �resultr r r r? s zsimple_producer.moreN)rE rF rG r r? r r r r rI s rI c @ s[ e Z d Z d d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d S)�fifoNc C s( | s t � | _ n t | � | _ d S)N)r �list)r rM r r r r ! s z fifo.__init__c C s t | j � S)N)r( rM )r r r r �__len__' s z fifo.__len__c C s | j S)N)rM )r r r r �is_empty* s z fifo.is_emptyc C s | j d S)Nr )rM )r r r r rB - s z fifo.firstc C s | j j | � d S)N)rM r )r r r r r r9 0 s z fifo.pushc C s$ | j r d | j j � f Sd Sd S)Nr" r )r N)rM �popleft)r r r r �pop3 s zfifo.pop) rE rF rG r rN rO rB r9 rQ r r r r rL s rL c C sE t | � d } x. | r@ | j | d | � � r@ | d 8} q W| S)Nr" )r( �endswith)ZhaystackZneedle�lr r r r* I s #r* ) rH r � collectionsr r r rI rL r* r r r r �<module>/ s �)
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