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For security reasons, GvR requested that Idle's Python execution server process
connect to the Idle process, which listens for the connection. Since Idle has
only one client per server, this was not a limitation.
+---------------------------------+ +-------------+
| SocketServer.BaseRequestHandler | | SocketIO |
+---------------------------------+ +-------------+
^ | register() |
| | unregister()|
| +-------------+
| ^ ^
| | |
| + -------------------+ |
| | |
+-------------------------+ +-----------------+
| RPCHandler | | RPCClient |
| [attribute of RPCServer]| | |
+-------------------------+ +-----------------+
The RPCServer handler class is expected to provide register/unregister methods.
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RPCHandlert SocketServert TCPServert __init__( t selft addrt handlerclass( ( s# /usr/lib64/python2.7/idlelib/rpc.pyR G s c C s d S( s@ Override TCPServer method, no bind() phase for connecting entityN( ( R ( ( s# /usr/lib64/python2.7/idlelib/rpc.pyt server_bindL s c C s | j j | j � d S( s� Override TCPServer method, connect() instead of listen()
Due to the reversed connection, self.server_address is actually the
address of the Idle Client to which we are connecting.
N( t sockett connectt server_address( R ( ( s# /usr/lib64/python2.7/idlelib/rpc.pyt server_activateP s c C s | j | j f S( s: Override TCPServer method, return already connected socket( R R ( R ( ( s# /usr/lib64/python2.7/idlelib/rpc.pyt get_requestY s c C s� y � Wn� t k
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sR Handle messages received on the socket.
Some messages received may be asynchronous 'call' or 'queue' requests,
and some may be responses for other threads.
'call' requests are passed to self.localcall() with the expectation of
immediate execution, during which time the socket is not serviced.
'queue' requests are used for tasks (which may block or hang) to be
processed in a different thread. These requests are fed into
request_queue by self.localcall(). Responses to queued requests are
taken from response_queue and sent across the link with the associated
sequence numbers. Messages in the queues are (sequence_number,
request/response) tuples and code using this module removing messages
from the request_queue is responsible for returning the correct
sequence number in the response_queue.
pollresponse() will loop until a response message with the myseq
sequence number is received, and will save other responses in
self.responses and notify the owning thread.
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