lbry-sdk/lbrynet/dht/msgtypes.py

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#!/usr/bin/env python
#
# This library is free software, distributed under the terms of
# the GNU Lesser General Public License Version 3, or any later version.
# See the COPYING file included in this archive
#
# The docstrings in this module contain epytext markup; API documentation
# may be created by processing this file with epydoc: http://epydoc.sf.net
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from lbrynet.core.utils import generate_id
from . import constants
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class Message(object):
""" Base class for messages - all "unknown" messages use this class """
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def __init__(self, rpcID, nodeID):
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if len(rpcID) != constants.rpc_id_length:
raise ValueError("invalid rpc id: %i bytes (expected 20)" % len(rpcID))
if len(nodeID) != constants.key_bits / 8:
raise ValueError("invalid node id: %i bytes (expected 48)" % len(nodeID))
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self.id = rpcID
self.nodeID = nodeID
class RequestMessage(Message):
""" Message containing an RPC request """
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def __init__(self, nodeID, method, methodArgs, rpcID=None):
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if rpcID is None:
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rpcID = generate_id()[:constants.rpc_id_length]
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Message.__init__(self, rpcID, nodeID)
self.request = method
self.args = methodArgs
class ResponseMessage(Message):
""" Message containing the result from a successful RPC request """
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def __init__(self, rpcID, nodeID, response):
Message.__init__(self, rpcID, nodeID)
self.response = response
class ErrorMessage(ResponseMessage):
""" Message containing the error from an unsuccessful RPC request """
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def __init__(self, rpcID, nodeID, exceptionType, errorMessage):
ResponseMessage.__init__(self, rpcID, nodeID, errorMessage)
if isinstance(exceptionType, type):
self.exceptionType = '%s.%s' % (exceptionType.__module__, exceptionType.__name__)
else:
self.exceptionType = exceptionType