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@ -9,7 +9,7 @@ from rpcudp.protocol import RPCProtocol
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import os
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PROXY_ADDR = ('0.0.0.0',1194)
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PROXY_ADDR = ('0.0.0.0',8368)
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class HalfForgetfulStorage(ForgetfulStorage):
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def __init__(self, ttl=604800):
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@ -129,22 +129,7 @@ if __name__ == '__main__':
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main()
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# class KadProtocol(RPCProtocol, ProxyDatagramProtocol):
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# def __init__(self, source_node, storage, ksize):
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# ProxyDatagramProtocol.__init__(self)
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# RPCProtocol.__init__(self)
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# self.router = RoutingTable(self, ksize, source_node)
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# self.storage = storage
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# self.source_node = source_node
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class KadProtocol(KademliaProtocol):
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# def datagram_received(self, data, addr):
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# LOG.debug("received datagram from %s", addr)
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# asyncio.ensure_future(self._solve_datagram(data, addr))
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remote_address = PROXY_ADDR
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REMOTES_D={}
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@ -160,161 +145,10 @@ class KadProtocol(KademliaProtocol):
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coro = loop.create_datagram_endpoint(lambda: RDP, remote_addr=self.remote_address)
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asyncio.ensure_future(coro)
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# async def start_datagram_proxy2(protocol_class, bind, port, remote_host, remote_port, source_node, storage, ksize):
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# loop = asyncio.get_event_loop()
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# protocol = protocol_class(source_node, storage, ksize)
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# return await loop.create_datagram_endpoint(
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# lambda: protocol, local_addr=(bind, port))
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class KadServer(Server):
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protocol_class = KademliaProtocol
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# async def listen(self, port, interface='0.0.0.0'):
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# """
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# Start listening on the given port.
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# Provide interface="::" to accept ipv6 address
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# """
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# loop = asyncio.get_event_loop()
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# remote_host='0.0.0.0'
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# remote_port=123
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# #listen = start_datagram_proxy2(self.protocol_class, interface, port, remote_host, remote_port, self.node, self.storage, self.ksize)
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# listen = loop.create_datagram_endpoint(self._create_protocol,
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# local_addr=(interface, port))
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# log.info("Node %i listening on %s:%i",
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# self.node.long_id, interface, port)
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# self.transport, self.protocol = await listen
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# # finally, schedule refreshing table
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# self.refresh_table()
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pass
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### FOR REFERENCE:
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class RPCProtocol(asyncio.DatagramProtocol):
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"""
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Protocol implementation using msgpack to encode messages and asyncio
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to handle async sending / recieving.
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"""
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def __init__(self, wait_timeout=5):
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"""
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Create a protocol instance.
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Args:
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wait_timeout (int): Time to wait for a response before giving up
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"""
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self._wait_timeout = wait_timeout
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self._outstanding = {}
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self.transport = None
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protocol_class = KademliaProtocol # KadProtocol #KademliaProtocol
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def connection_made(self, transport):
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self.transport = transport
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def datagram_received(self, data, addr):
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LOG.debug("received datagram from %s", addr)
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asyncio.ensure_future(self._solve_datagram(data, addr))
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async def _solve_datagram(self, datagram, address):
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if len(datagram) < 22:
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LOG.warning("received datagram too small from %s,"
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" ignoring", address)
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return
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msg_id = datagram[1:21]
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data = umsgpack.unpackb(datagram[21:])
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if datagram[:1] == b'\x00':
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# schedule accepting request and returning the result
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asyncio.ensure_future(self._accept_request(msg_id, data, address))
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elif datagram[:1] == b'\x01':
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self._accept_response(msg_id, data, address)
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else:
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# otherwise, don't know the format, don't do anything
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LOG.debug("Received unknown message from %s, ignoring", address)
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def _accept_response(self, msg_id, data, address):
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msgargs = (b64encode(msg_id), address)
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if msg_id not in self._outstanding:
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LOG.warning("received unknown message %s "
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"from %s; ignoring", *msgargs)
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return
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LOG.debug("received response %s for message "
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"id %s from %s", data, *msgargs)
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future, timeout = self._outstanding[msg_id]
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timeout.cancel()
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future.set_result((True, data))
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del self._outstanding[msg_id]
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async def _accept_request(self, msg_id, data, address):
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if not isinstance(data, list) or len(data) != 2:
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raise MalformedMessage("Could not read packet: %s" % data)
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funcname, args = data
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func = getattr(self, "rpc_%s" % funcname, None)
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if func is None or not callable(func):
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msgargs = (self.__class__.__name__, funcname)
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LOG.warning("%s has no callable method "
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"rpc_%s; ignoring request", *msgargs)
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return
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pass
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if not asyncio.iscoroutinefunction(func):
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func = asyncio.coroutine(func)
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response = await func(address, *args)
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LOG.debug("sending response %s for msg id %s to %s",
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response, b64encode(msg_id), address)
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txdata = b'\x01' + msg_id + umsgpack.packb(response)
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self.transport.sendto(txdata, address)
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def _timeout(self, msg_id):
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args = (b64encode(msg_id), self._wait_timeout)
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LOG.error("Did not receive reply for msg "
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"id %s within %i seconds", *args)
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self._outstanding[msg_id][0].set_result((False, None))
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del self._outstanding[msg_id]
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def __getattr__(self, name):
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"""
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If name begins with "_" or "rpc_", returns the value of
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the attribute in question as normal.
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Otherwise, returns the value as normal *if* the attribute
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exists, but does *not* raise AttributeError if it doesn't.
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Instead, returns a closure, func, which takes an argument
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"address" and additional arbitrary args (but not kwargs).
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func attempts to call a remote method "rpc_{name}",
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passing those args, on a node reachable at address.
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"""
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if name.startswith("_") or name.startswith("rpc_"):
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return getattr(super(), name)
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try:
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return getattr(super(), name)
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except AttributeError:
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pass
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def func(address, *args):
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msg_id = sha1(os.urandom(32)).digest()
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data = umsgpack.packb([name, args])
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if len(data) > 8192:
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raise MalformedMessage("Total length of function "
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"name and arguments cannot exceed 8K")
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txdata = b'\x00' + msg_id + data
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LOG.debug("calling remote function %s on %s (msgid %s)",
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name, address, b64encode(msg_id))
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self.transport.sendto(txdata, address)
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loop = asyncio.get_event_loop()
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if hasattr(loop, 'create_future'):
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future = loop.create_future()
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else:
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future = asyncio.Future()
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timeout = loop.call_later(self._wait_timeout,
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self._timeout, msg_id)
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self._outstanding[msg_id] = (future, timeout)
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return future
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return func
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quadrismegistus
4 years ago