72 lines
3.2 KiB
Python
72 lines
3.2 KiB
Python
#!/usr/bin/env python
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#
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# This library is free software, distributed under the terms of
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# the GNU Lesser General Public License Version 3, or any later version.
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# See the COPYING file included in this archive
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#
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# The docstrings in this module contain epytext markup; API documentation
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# may be created by processing this file with epydoc: http://epydoc.sf.net
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import msgtypes
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class MessageTranslator(object):
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""" Interface for RPC message translators/formatters
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Classes inheriting from this should provide a translation services between
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the classes used internally by this Kademlia implementation and the actual
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data that is transmitted between nodes.
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"""
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def fromPrimitive(self, msgPrimitive):
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""" Create an RPC Message from a message's string representation
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@param msgPrimitive: The unencoded primitive representation of a message
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@type msgPrimitive: str, int, list or dict
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@return: The translated message object
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@rtype: entangled.kademlia.msgtypes.Message
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"""
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def toPrimitive(self, message):
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""" Create a string representation of a message
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@param message: The message object
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@type message: msgtypes.Message
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@return: The message's primitive representation in a particular
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messaging format
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@rtype: str, int, list or dict
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"""
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class DefaultFormat(MessageTranslator):
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""" The default on-the-wire message format for this library """
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typeRequest, typeResponse, typeError = range(3)
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headerType, headerMsgID, headerNodeID, headerPayload, headerArgs = range(5)
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def fromPrimitive(self, msgPrimitive):
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msgType = msgPrimitive[self.headerType]
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if msgType == self.typeRequest:
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msg = msgtypes.RequestMessage(msgPrimitive[self.headerNodeID], msgPrimitive[self.headerPayload], msgPrimitive[self.headerArgs], msgPrimitive[self.headerMsgID])
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elif msgType == self.typeResponse:
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msg = msgtypes.ResponseMessage(msgPrimitive[self.headerMsgID], msgPrimitive[self.headerNodeID], msgPrimitive[self.headerPayload])
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elif msgType == self.typeError:
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msg = msgtypes.ErrorMessage(msgPrimitive[self.headerMsgID], msgPrimitive[self.headerNodeID], msgPrimitive[self.headerPayload], msgPrimitive[self.headerArgs])
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else:
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# Unknown message, no payload
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msg = msgtypes.Message(msgPrimitive[self.headerMsgID], msgPrimitive[self.headerNodeID])
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return msg
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def toPrimitive(self, message):
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msg = {self.headerMsgID: message.id,
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self.headerNodeID: message.nodeID}
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if isinstance(message, msgtypes.RequestMessage):
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msg[self.headerType] = self.typeRequest
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msg[self.headerPayload] = message.request
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msg[self.headerArgs] = message.args
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elif isinstance(message, msgtypes.ErrorMessage):
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msg[self.headerType] = self.typeError
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msg[self.headerPayload] = message.exceptionType
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msg[self.headerArgs] = message.response
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elif isinstance(message, msgtypes.ResponseMessage):
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msg[self.headerType] = self.typeResponse
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msg[self.headerPayload] = message.response
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return msg
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