B
    tZ.                 @   s&  d Z ddlmZmZ ddlZejd dk r0eZndd ZeZ	ddl
mZ ddlZddlZddlZddlZyddlmZ W n  ek
r   dd	lmZ Y nX dd
lmZ ddlmZ dZdZG dd deZdd ZG dd deZG dd deZG dd de Z!G dd deZ"G dd deZ#dS )zMTerminal management for exposing terminals to a web interface using Tornado.
    )absolute_importprint_functionN   c             C   s   | S )N )xr   r   3lib/python3.7/site-packages/terminado/management.py<lambda>   s    r   )deque)PtyProcessUnicode)
PtyProcess)gen)IOLoopZPYXTERM_Zxtermc               @   sH   e Zd Zdd Zdd ZejfddZejfddZe	j
dd
dZdS )PtyWithClientsc             C   s   || _ g | _tg dd| _d S )N
   )maxlen)ptyprocclientsr	   read_buffer)selfr   r   r   r   __init__#   s    zPtyWithClients.__init__c             C   s   d }}x@| j D ]6}|j\}}|dk	r2||k r2|}|dk	r||k r|}qW |dksZ|dkr^dS | j \}}||f||fkr| j|| dS )a  Set the terminal size to that of the smallest client dimensions.
        
        A terminal not using the full space available is much nicer than a
        terminal trying to use more than the available space, so we keep it 
        sized to the smallest client.
        i'  N)r   sizer   Z
getwinsizeZ
setwinsize)r   ZminrowsZmincolsclientZrowsZcolsr   r   r   resize_to_smallest+   s    
z!PtyWithClients.resize_to_smallestc             C   s   | j | dS )z'Send a signal to the process in the ptyN)r   kill)r   sigr   r   r   r   A   s    zPtyWithClients.killc             C   s4   t jdkr| j|S t | jj}t || dS )z<Send a signal to the process group of the process in the ptyntN)osnamer   r   getpgidpidkillpg)r   r   Zpgidr   r   r   r    E   s    
zPtyWithClients.killpgFc             #   s  t jdkrtjtjg}ntjtjtjtjg}t   fdd}j	
 sVtdyzx2|D ]*}| | V  j	
 s^tdq^W |rĈtj | V  j	
 stdn
tdtdW n@ tk
r   | V  j	
 stdn
tdY nX dS )zThis forces a child process to terminate. It starts nicely with
        SIGHUP and SIGINT. If "force" is True then moves onto SIGKILL. This
        returns True if the child was terminated. This returns False if the
        child could not be terminated. r   c                  s   t  j  jj S )N)r   ZTaskZadd_timeoutZtimer   Zdelayafterterminater   )loopr   r   r   r   Y   s    z*PtyWithClients.terminate.<locals>.<lambda>TFN)r   r   signalSIGINTSIGTERMSIGHUPSIGCONTr   Zcurrentr   Zisaliver   ZReturnr   SIGKILLOSError)r   forceZsignalsZsleepr   r   )r!   r   r   	terminateL   s4    







zPtyWithClients.terminateN)F)__name__
__module____qualname__r   r   r"   r$   r   r    r   	coroutiner*   r   r   r   r   r   "   s   r   c             C   s8   x2|  D ]&\}}|dkr(| |d q
|| |< q
W dS )zALike dict.update(), but remove keys where the value is None.
    N)itemspop)targetZchangeskvr   r   r   _update_removingv   s    r4   c               @   s|   e Zd ZdZdi ddfddZdd	d
Zdd Zdd Zdd ZdddZ	dddZ
dd Zejdd Zejdd ZdS )TermManagerBasez"Base class for a terminal manager. Nc             C   sT   || _ || _|| _|| _tt| _i | _|d k	r:|| _	ndd l
}|j	j | _	d S )Nr   )shell_command
server_urlterm_settings	extra_envloggingZ	getLoggerr+   log
ptys_by_fdiolooptornado.ioloopr   instance)r   r7   r8   r9   r:   r>   tornador   r   r   r      s    zTermManagerBase.__init__   P   r   c             K   s   t j }| jdt|d< d||f }|r@|r@|d||f 7 }||td < t||d< t||d< | jrx| j|td < | j	rt
|| j	 |S )	z@Build the environment variables for the process in the terminal.typeZTERMz%dx%dz;%dx%dZ
DIMENSIONSZCOLUMNSZLINESZURL)r   environcopyr9   getDEFAULT_TERM_TYPE
ENV_PREFIXstrr8   r:   r4   )r   ZheightwidthZ	winheightZwinwidthkwargsenvZ
dimensionsr   r   r   make_term_env   s    
zTermManagerBase.make_term_envc             K   sR   | j  }| j|d< || |d }| jf |}tj|||ddd}t|S )z?Make a new terminal, return a :class:`PtyWithClients` instance.r7   cwdN)rM   rO   )	r9   rF   r7   updaterN   r
   ZspawnrG   r   )r   rL   ZoptionsargvrM   Zptyr   r   r   new_terminal   s    


zTermManagerBase.new_terminalc             C   s,   |j j}|| j|< | j|| j| jj dS )zBConnect a terminal to the tornado event loop to read data from it.N)r   fdr=   r>   Zadd_handlerpty_readZREAD)r   ptywclientsrS   r   r   r   start_reading   s    
zTermManagerBase.start_readingc             C   s8   |j j}| jd| | j|= | j| |j   dS )z(Called when the pty has closed.
        zEOF on FD %d; stopping readingN)r   rS   r<   infor=   r>   Zremove_handlerclose)r   rU   rS   r   r   r   on_eof   s
    zTermManagerBase.on_eofc             C   s|   | j | }y6|jd}|j| x|jD ]}|| q,W W n6 tk
rv   | | x|jD ]}|	  qbW Y nX dS )z>Called by the event loop when there is pty data ready to read.i   N)
r=   r   readr   appendr   Zon_pty_readEOFErrorrY   Zon_pty_died)r   rS   ZeventsrU   sr   r   r   r   rT      s    

zTermManagerBase.pty_readc             C   s   t dS )a?  Override in a subclass to give a terminal to a new websocket connection
        
        The :class:`TermSocket` handler works with zero or one URL components
        (capturing groups in the URL spec regex). If it receives one, it is
        passed as the ``url_component`` parameter; otherwise, this is None.
        N)NotImplementedError)r   url_componentr   r   r   get_terminal   s    zTermManagerBase.get_terminalc             C   s   dS )zFOverride this to e.g. kill terminals on client disconnection.
        Nr   )r   	websocketr   r   r   client_disconnected   s    z#TermManagerBase.client_disconnectedc             c   s   |   V  d S )N)kill_all)r   r   r   r   shutdown   s    zTermManagerBase.shutdownc             c   sB   g }x$| j  D ]}||jdd qW x|D ]
}|V  q0W d S )NT)r)   )r=   valuesr[   r*   )r   Zfuturestermfr   r   r   rc      s
    
zTermManagerBase.kill_all)rB   rC   r   r   )N)N)r+   r,   r-   __doc__r   rN   rR   rV   rY   rT   r`   rb   r   r.   rd   rc   r   r   r   r   r5      s   



	r5   c                   s<   e Zd ZdZ fddZd	ddZej fddZ  Z	S )
SingleTermManagerz9All connections to the websocket share a common terminal.c                s   t t| jf | d | _d S )N)superri   r   terminal)r   rL   )	__class__r   r   r      s    zSingleTermManager.__init__Nc             C   s&   | j d kr |  | _ | | j  | j S )N)rk   rR   rV   )r   r_   r   r   r   r`      s    

zSingleTermManager.get_terminalc             #   s   t t|  V  d | _d S )N)rj   ri   rc   rk   )r   )rl   r   r   rc      s    zSingleTermManager.kill_all)N)
r+   r,   r-   rh   r   r`   r   r.   rc   __classcell__r   r   )rl   r   ri      s   
ri   c               @   s   e Zd Zdd Zdd ZdS )MaxTerminalsReachedc             C   s
   || _ d S )N)max_terminals)r   ro   r   r   r   r      s    zMaxTerminalsReached.__init__c             C   s
   d| j  S )Nz$Cannot create more than %d terminals)ro   )r   r   r   r   __str__   s    zMaxTerminalsReached.__str__N)r+   r,   r-   r   rp   r   r   r   r   rn      s   rn   c                   s4   e Zd ZdZd	 fdd	Zd
ddZdd Z  ZS )UniqueTermManagerz-Give each websocket a unique terminal to use.Nc                s   t t| jf | || _d S )N)rj   rq   r   ro   )r   ro   rL   )rl   r   r   r     s    zUniqueTermManager.__init__c             C   s6   | j r t| j| j kr t| j |  }| | |S )N)ro   lenr=   rn   rR   rV   )r   r_   rf   r   r   r   r`     s
    

zUniqueTermManager.get_terminalc             C   sL   | j d |jrHtjdkr:|j  | |jjj dS |j	t
j dS )z-Send terminal SIGHUP when client disconnects.z-Websocket closed, sending SIGHUP to terminal.r   N)r<   rW   rk   r   r   r   rT   r   rS   r    r"   r%   )r   ra   r   r   r   rb     s    

z%UniqueTermManager.client_disconnected)N)N)r+   r,   r-   rh   r   r`   rb   rm   r   r   )rl   r   rq     s   
rq   c                   sz   e Zd ZdZd fdd	Zdd ZdZdd	 Zd
d Ze	j
fddZejdddZ fddZej fddZ  ZS )NamedTermManagerzGShare terminals between websockets connected to the same endpoint.
    Nc                s"   t t| jf | || _i | _d S )N)rj   rs   r   ro   	terminals)r   ro   rL   )rl   r   r   r     s    zNamedTermManager.__init__c             C   st   |d k	st || jkr | j| S | jr@t| j| jkr@t| j| jd| |  }||_|| j|< | 	| |S )Nz$New terminal with specified name: %s)
AssertionErrorrt   ro   rr   rn   r<   rW   rR   	term_namerV   )r   rv   rf   r   r   r   r`   $  s    




zNamedTermManager.get_terminalz%dc             C   s2   x,t jddD ]}| j| }|| jkr|S qW d S )N   )start)	itertoolscountname_templatert   )r   nr   r   r   r   _next_available_name7  s    

z%NamedTermManager._next_available_namec             C   s@   |   }|  }| jd| ||_|| j|< | | ||fS )Nz$New terminal with automatic name: %s)r}   rR   r<   rW   rv   rt   rV   )r   r   rf   r   r   r   new_named_terminal=  s    

z#NamedTermManager.new_named_terminalc             C   s   | j | }|| d S )N)rt   r   )r   r   r   rf   r   r   r   r   F  s    
zNamedTermManager.killFc             c   s   | j | }|j|dV  d S )N)r)   )rt   r*   )r   r   r)   rf   r   r   r   r*   J  s    
zNamedTermManager.terminatec                s6   t t| | |j}| jd| | j|d  d S )NzTerminal %s closed)rj   rs   rY   rv   r<   rW   rt   r0   )r   rU   r   )rl   r   r   rY   O  s    zNamedTermManager.on_eofc             #   s   t t|  V  i | _d S )N)rj   rs   rc   rt   )r   )rl   r   r   rc   U  s    zNamedTermManager.kill_all)N)F)r+   r,   r-   rh   r   r`   r{   r}   r~   r"   r$   r   r   r.   r*   rY   rc   rm   r   r   )rl   r   rs     s   	rs   )$rh   Z
__future__r   r   sysversion_infoordZ	byte_coderJ   Zunicodecollectionsr	   ry   r;   r   r"   Z
ptyprocessr
   ImportErrorZwinptyr   rA   r   r?   r   rI   rH   objectr   r4   r5   ri   	Exceptionrn   rq   rs   r   r   r   r   <module>   s4   T	j