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asynchat.cpython-37.pyc
B ���c�Z1�� @ sD d Z ddlZddlmZ G dd� dej�ZG dd� d�Zdd � ZdS ) 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 Zd ZdZdZdZdZdZd(dd�Zdd � Z d d � Z d d � Z dd� Z dd� Z dd� Zdd� Zdd� Zdd� Zdd� Zd d � Zd d � Zd d!� Zd"d#� Zd$d%� Zd&d'� ZdS ))� async_chatz�This is an abstract class. You must derive from this class, and add the two methods collect_incoming_data() and found_terminator()i r zlatin-1Nc C s( d| _ g | _t� | _tj�| ||� d S )N� )� ac_in_buffer�incomingr � producer_fifo�asyncore� dispatcher�__init__)�selfZsock�map� r �-/opt/alt/python37/lib64/python3.7/asynchat.pyr C s zasync_chat.__init__c C s t d��d S )Nz must be implemented in subclass)�NotImplementedError)r �datar r r �collect_incoming_dataQ s z async_chat.collect_incoming_datac C s | j �|� d S )N)r �append)r r r r r �_collect_incoming_dataT s z!async_chat._collect_incoming_datac C s d� | j�}| jd d �= |S )Nr )�joinr )r �dr r r � _get_dataW s zasync_chat._get_datac C s t d��d S )Nz must be implemented in subclass)r )r r r r �found_terminator\ s zasync_chat.found_terminatorc C sB t |t�r | jr t|| j�}nt |t�r8|dk r8td��|| _dS )zdSet the input delimiter. Can be a fixed string of any length, an integer, or None. r z-the number of received bytes must be positiveN)� isinstance�str� use_encoding�bytes�encoding�int� ValueError� terminator)r Ztermr r r �set_terminator_ s zasync_chat.set_terminatorc C s | j S )N)r )r r r r �get_terminatorj s zasync_chat.get_terminatorc C s� y| � | j�}W n< tk r$ d S tk rL } z | �� d S d }~X Y nX t|t�rj| jrjtt| j �}| j | | _ �xV| j �r�t | j �}| � � }|s�| � | j � d| _ qzt|t��r|}||k r�| � | j � d| _ | j| | _n2| � | j d |� � | j |d � | _ d| _| �� qzt |�}| j �|�}|dk�rr|dk�rT| � | j d |� � | j || d � | _ | �� qzt| j |�}|�r�||k�r�| � | j d | � � | j | d � | _ P qz| � | j � d| _ qzW d 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 | � � d S )N)� initiate_send)r r r r � handle_write� s zasync_chat.handle_writec C s | � � d S )N)�close)r r r r � handle_close� s zasync_chat.handle_closec C s| t |tttf�s tdt|���| j}t|�|krdx>tdt|�|�D ] }| j � |||| � � qBW n | 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 �|� | �� d S )N)r r r- )r Zproducerr r r �push_with_producer� s z async_chat.push_with_producerc C s dS )z4predicate for inclusion in the readable for select()� 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 �d� dS )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 s �x| j �r| j�r| j d }|s>| j d= |d kr>| �� d S | j}y|d |� }W n8 tk r� |�� }|r~| j �|� n| j d= wY nX t|t�r�| j r�t || j �}y| � |�}W n t k r� | �� d S X |�r|t|�k s�|t|�k �r ||d � | j d< n| j d= d S W d S )Nr )r r< r0 r5 r3 �more� appendleftr r r r r �sendr% r& r' )r �firstZobsr Znum_sentr r r r- � s8 zasync_chat.initiate_sendc C s d| _ | jd d �= | j�� d S )Nr )r r r �clear)r r r r �discard_buffers s zasync_chat.discard_buffers)NN)�__name__� __module__� __qualname__�__doc__r# r5 r r r r r r r r r! r, r. r0 r8 r9 r; r= r> r- rD r r r r r 4 s, H (r c @ s e Zd Zddd�Zdd� ZdS )�simple_producer� c C s || _ || _d S )N)r � buffer_size)r r rK r r r r s zsimple_producer.__init__c C sJ t | j�| jkr6| jd | j� }| j| jd � | _|S | j}d| _|S d S )Nr )r' r rK )r �resultr r r r? s zsimple_producer.moreN)rJ )rE rF rG r r? r r r r rI s rI c C s4 t |�d }x"|r.| �|d |� �s.|d8 }qW |S )Nr: )r' �endswith)ZhaystackZneedle�lr r r r) / s r) )rH r � collectionsr r r rI r) r r r r �<module>/ s \
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