1 ## Copyright 2002-2003 Andrew Loewenstern, All Rights Reserved
2 # see LICENSE.txt for license information
4 from bencode import bencode, bdecode
5 from time import asctime
7 from traceback import format_exception
9 from twisted.internet.defer import Deferred
10 from twisted.internet import protocol
11 from twisted.internet import reactor
16 KRPC_ERROR_METHOD_UNKNOWN = 2
17 KRPC_ERROR_RECEIVED_UNKNOWN = 3
18 KRPC_ERROR_TIMEOUT = 4
28 class hostbroker(protocol.DatagramProtocol):
29 def __init__(self, server):
31 # this should be changed to storage that drops old entries
34 def datagramReceived(self, datagram, addr):
35 #print `addr`, `datagram`
36 #if addr != self.addr:
37 c = self.connectionForAddr(addr)
38 c.datagramReceived(datagram, addr)
40 # del self.connections[addr]
42 def connectionForAddr(self, addr):
45 if not self.connections.has_key(addr):
46 conn = self.protocol(addr, self.server, self.transport)
47 self.connections[addr] = conn
49 conn = self.connections[addr]
52 def makeConnection(self, transport):
53 protocol.DatagramProtocol.makeConnection(self, transport)
54 tup = transport.getHost()
55 self.addr = (tup.host, tup.port)
60 def __init__(self, addr, server, transport):
61 self.transport = transport
67 def datagramReceived(self, str, addr):
73 print "response decode error: " + `e`
81 # tell factory to handle
82 f = getattr(self.factory ,"krpc_" + msg[REQ], None)
83 msg[ARG]['_krpc_sender'] = self.addr
86 ret = apply(f, (), msg[ARG])
89 out = bencode({TID:msg[TID], TYP:ERR, ERR :`format_exception(type(e), e, sys.exc_info()[2])`})
91 self.transport.write(out, addr)
95 out = bencode({TID : msg[TID], TYP : RSP, RSP : ret})
97 out = bencode({TID : msg[TID], TYP : RSP, RSP : {}})
100 self.transport.write(out, addr)
104 print "don't know about method %s" % msg[REQ]
106 out = bencode({TID:msg[TID], TYP:ERR, ERR : KRPC_ERROR_METHOD_UNKNOWN})
108 self.transport.write(out, addr)
110 print "%s %s >>> %s - %s %s %s" % (asctime(), addr, self.factory.node.port,
111 ilen, msg[REQ], olen)
112 elif msg[TYP] == RSP:
115 if self.tids.has_key(msg[TID]):
116 df = self.tids[msg[TID]]
118 del(self.tids[msg[TID]])
119 df.callback({'rsp' : msg[RSP], '_krpc_sender': addr})
121 print 'timeout ' + `msg[RSP]['id']`
122 # no tid, this transaction timed out already...
123 elif msg[TYP] == ERR:
126 if self.tids.has_key(msg[TID]):
127 df = self.tids[msg[TID]]
130 del(self.tids[msg[TID]])
132 # day late and dollar short
135 print "unknown message type " + `msg`
136 # unknown message type
137 df = self.tids[msg[TID]]
139 df.errback(KRPC_ERROR_RECEIVED_UNKNOWN)
140 del(self.tids[msg[TID]])
142 def sendRequest(self, method, args):
145 msg = {TID : chr(self.mtid), TYP : REQ, REQ : method, ARG : args}
146 self.mtid = (self.mtid + 1) % 256
149 self.tids[msg[TID]] = d
150 def timeOut(tids = self.tids, id = msg[TID]):
154 print ">>>>>> KRPC_ERROR_TIMEOUT"
155 df.errback(KRPC_ERROR_TIMEOUT)
156 reactor.callLater(KRPC_TIMEOUT, timeOut)
157 self.transport.write(str, self.addr)