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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.
RPCHandler inherits the mix-in class SocketIO, which provides these methods.
See the Idle run.main() docstring for further information on how this was
accomplished in Idle.
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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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Error message goes to __stderr__. No error message if exiting
normally or socket raised EOF. Other exceptions not handled in
server code will cause os._exit.
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localcall:t ERRORs Bad request formats Unknown object id: %rt __methods__t OKt __attributes__s Unsupported method name: %rt CALLt QUEUEt QUEUEDs Unsupported message type: %ssU *** Internal Error: rpc.py:SocketIO.localcall()
Object: %s
Method: %s
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pollresponse() will loop looking for seq number None, which
never comes, and exit on EOFError.
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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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