2 Implementation of Bitcoin's p2p protocol
5 from __future__ import division
14 from twisted.internet import defer, protocol, reactor
16 from . import data as bitcoin_data
17 from p2pool.util import variable, datachunker, deferral
19 class BaseProtocol(protocol.Protocol):
20 def connectionMade(self):
21 self.dataReceived = datachunker.DataChunker(self.dataReceiver())
23 def dataReceiver(self):
26 while start != self._prefix:
27 start = (start + (yield 1))[-len(self._prefix):]
29 command = (yield 12).rstrip('\0')
30 length, = struct.unpack('<I', (yield 4))
37 payload = yield length
41 payload = zlib.decompress(payload)
43 print 'FAILURE DECOMPRESSING'
46 if checksum is not None:
47 if hashlib.sha256(hashlib.sha256(payload).digest()).digest()[:4] != checksum:
48 print 'RECV', command, checksum.encode('hex') if checksum is not None else None, repr(payload.encode('hex')), len(payload)
52 type_ = getattr(self, "message_" + command, None)
54 print 'RECV', command, checksum.encode('hex') if checksum is not None else None, repr(payload.encode('hex')), len(payload)
55 print 'NO TYPE FOR', repr(command)
59 payload2 = type_.unpack(payload)
61 print 'RECV', command, checksum.encode('hex') if checksum is not None else None, repr(payload.encode('hex')), len(payload)
65 handler = getattr(self, 'handle_' + command, None)
67 print 'RECV', command, checksum.encode('hex') if checksum is not None else None, repr(payload.encode('hex')), len(payload)
68 print 'NO HANDLER FOR', command
71 #print 'RECV', command, repr(payload2)[:500]
76 print 'RECV', command, checksum.encode('hex') if checksum is not None else None, repr(payload.encode('hex')), len(payload)
80 def sendPacket(self, command, payload2):
81 if len(command) >= 12:
82 raise ValueError('command too long')
83 type_ = getattr(self, "message_" + command, None)
85 raise ValueError('invalid command')
86 #print 'SEND', command, repr(payload2)[:500]
87 payload = type_.pack(payload2)
89 checksum = hashlib.sha256(hashlib.sha256(payload).digest()).digest()[:4]
93 payload = zlib.compress(payload)
94 data = self._prefix + struct.pack('<12sI', command, len(payload)) + checksum + payload
95 self.transport.write(data)
97 def __getattr__(self, attr):
99 if attr.startswith(prefix):
100 command = attr[len(prefix):]
101 return lambda **payload2: self.sendPacket(command, payload2)
102 #return protocol.Protocol.__getattr__(self, attr)
103 raise AttributeError(attr)
105 class Protocol(BaseProtocol):
106 def __init__(self, net):
107 self._prefix = net.BITCOIN_P2P_PREFIX
113 def use_checksum(self):
114 return self.version >= 209
119 def connectionMade(self):
120 BaseProtocol.connectionMade(self)
125 time=int(time.time()),
128 address=self.transport.getPeer().host,
129 port=self.transport.getPeer().port,
133 address=self.transport.getHost().host,
134 port=self.transport.getHost().port,
136 nonce=random.randrange(2**64),
141 message_version = bitcoin_data.ComposedType([
142 ('version', bitcoin_data.StructType('<I')),
143 ('services', bitcoin_data.StructType('<Q')),
144 ('time', bitcoin_data.StructType('<Q')),
145 ('addr_to', bitcoin_data.address_type),
146 ('addr_from', bitcoin_data.address_type),
147 ('nonce', bitcoin_data.StructType('<Q')),
148 ('sub_version_num', bitcoin_data.VarStrType()),
149 ('start_height', bitcoin_data.StructType('<I')),
151 def handle_version(self, version, services, time, addr_to, addr_from, nonce, sub_version_num, start_height):
152 #print 'VERSION', locals()
153 self.version_after = version
156 message_verack = bitcoin_data.ComposedType([])
157 def handle_verack(self):
158 self.version = self.version_after
163 self.check_order = deferral.GenericDeferrer(2**256, lambda id, order: self.send_checkorder(id=id, order=order))
164 self.submit_order = deferral.GenericDeferrer(2**256, lambda id, order: self.send_submitorder(id=id, order=order))
165 self.get_block = deferral.ReplyMatcher(lambda hash: self.send_getdata(requests=[dict(type='block', hash=hash)]))
166 self.get_block_header = deferral.ReplyMatcher(lambda hash: self.send_getheaders(version=1, have=[], last=hash))
167 self.get_tx = deferral.ReplyMatcher(lambda hash: self.send_getdata(requests=[dict(type='tx', hash=hash)]))
169 if hasattr(self.factory, 'resetDelay'):
170 self.factory.resetDelay()
171 if hasattr(self.factory, 'gotConnection'):
172 self.factory.gotConnection(self)
174 message_inv = bitcoin_data.ComposedType([
175 ('invs', bitcoin_data.ListType(bitcoin_data.ComposedType([
176 ('type', bitcoin_data.EnumType(bitcoin_data.StructType('<I'), {'tx': 1, 'block': 2})),
177 ('hash', bitcoin_data.HashType()),
180 def handle_inv(self, invs):
182 if inv['type'] == 'tx':
183 self.factory.new_tx.happened(inv['hash'])
184 elif inv['type'] == 'block':
185 self.factory.new_block.happened(inv['hash'])
187 print "Unknown inv type", item
189 message_getdata = bitcoin_data.ComposedType([
190 ('requests', bitcoin_data.ListType(bitcoin_data.ComposedType([
191 ('type', bitcoin_data.EnumType(bitcoin_data.StructType('<I'), {'tx': 1, 'block': 2})),
192 ('hash', bitcoin_data.HashType()),
195 message_getblocks = bitcoin_data.ComposedType([
196 ('version', bitcoin_data.StructType('<I')),
197 ('have', bitcoin_data.ListType(bitcoin_data.HashType())),
198 ('last', bitcoin_data.PossiblyNone(0, bitcoin_data.HashType())),
200 message_getheaders = bitcoin_data.ComposedType([
201 ('version', bitcoin_data.StructType('<I')),
202 ('have', bitcoin_data.ListType(bitcoin_data.HashType())),
203 ('last', bitcoin_data.PossiblyNone(0, bitcoin_data.HashType())),
205 message_getaddr = bitcoin_data.ComposedType([])
206 message_checkorder = bitcoin_data.ComposedType([
207 ('id', bitcoin_data.HashType()),
208 ('order', bitcoin_data.FixedStrType(60)), # XXX
210 message_submitorder = bitcoin_data.ComposedType([
211 ('id', bitcoin_data.HashType()),
212 ('order', bitcoin_data.FixedStrType(60)), # XXX
215 message_addr = bitcoin_data.ComposedType([
216 ('addrs', bitcoin_data.ListType(bitcoin_data.ComposedType([
217 ('timestamp', bitcoin_data.StructType('<I')),
218 ('address', bitcoin_data.address_type),
221 def handle_addr(self, addrs):
225 message_tx = bitcoin_data.ComposedType([
226 ('tx', bitcoin_data.tx_type),
228 def handle_tx(self, tx):
229 self.get_tx.got_response(bitcoin_data.tx_type.hash256(tx), tx)
231 message_block = bitcoin_data.ComposedType([
232 ('block', bitcoin_data.block_type),
234 def handle_block(self, block):
235 block_hash = bitcoin_data.block_header_type.hash256(block['header'])
236 self.get_block.got_response(block_hash, block)
237 self.get_block_header.got_response(block_hash, block['header'])
239 message_headers = bitcoin_data.ComposedType([
240 ('headers', bitcoin_data.ListType(bitcoin_data.block_type)),
242 def handle_headers(self, headers):
243 for header in headers:
244 header = header['header']
245 self.get_block_header.got_response(bitcoin_data.block_header_type.hash256(header), header)
246 self.factory.new_headers.happened([header['header'] for header in headers])
248 message_reply = bitcoin_data.ComposedType([
249 ('hash', bitcoin_data.HashType()),
250 ('reply', bitcoin_data.EnumType(bitcoin_data.StructType('<I'), {'success': 0, 'failure': 1, 'denied': 2})),
251 ('script', bitcoin_data.PossiblyNone("", bitcoin_data.VarStrType())),
253 def handle_reply(self, hash, reply, script):
254 self.check_order.got_response(hash, dict(reply=reply, script=script))
255 self.submit_order.got_response(hash, dict(reply=reply, script=script))
257 message_ping = bitcoin_data.ComposedType([])
258 def handle_ping(self):
261 message_alert = bitcoin_data.ComposedType([
262 ('message', bitcoin_data.VarStrType()),
263 ('signature', bitcoin_data.VarStrType()),
265 def handle_alert(self, message, signature):
266 print "ALERT:", (message, signature)
268 def connectionLost(self, reason):
269 if hasattr(self.factory, 'gotConnection'):
270 self.factory.gotConnection(None)
272 class ClientFactory(protocol.ReconnectingClientFactory):
277 def __init__(self, net):
279 self.conn = variable.Variable(None)
281 self.new_block = variable.Event()
282 self.new_tx = variable.Event()
283 self.new_headers = variable.Event()
285 def buildProtocol(self, addr):
286 p = self.protocol(self.net)
290 def gotConnection(self, conn):
293 def getProtocol(self):
294 return self.conn.get_not_none()
296 class HeaderWrapper(object):
297 def __init__(self, header):
298 self.hash = bitcoin_data.block_header_type.hash256(header)
299 self.previous_hash = header['previous_block']
301 class HeightTracker(object):
302 '''Point this at a factory and let it take care of getting block heights'''
303 # XXX think keeps object alive
305 def __init__(self, factory):
306 self.factory = factory
307 self.tracker = bitcoin_data.Tracker()
308 self.most_recent = None
310 self.factory.new_headers.watch(self.heard_headers)
314 @defer.inlineCallbacks
317 yield self.factory.getProtocol()
319 highest_head = max(self.tracker.heads, key=lambda h: self.tracker.get_height_and_last(h)[0]) if self.tracker.heads else None
320 it = self.tracker.get_chain_known(highest_head)
325 except StopIteration:
330 have.append(cur.hash)
331 for i in xrange(step): # XXX inefficient
334 except StopIteration:
341 chain = list(self.tracker.get_chain_known(highest_head))
343 have.append(chain[-1].hash)
347 yield deferral.sleep(1)
352 good_tails = [x for x in self.tracker.tails if x is not None]
353 self.request(have, random.choice(good_tails) if good_tails else None)
354 for tail in self.tracker.tails:
357 self.request([], tail)
359 yield self.factory.new_headers.get_deferred(timeout=5)
360 except defer.TimeoutError:
363 def heard_headers(self, headers):
364 header2s = map(HeaderWrapper, headers)
365 for header2 in header2s:
366 self.tracker.add(header2)
368 if self.tracker.get_height_and_last(header2s[-1].hash)[1] is None:
369 self.most_recent = header2s[-1].hash
370 if random.random() < .6:
371 self.request([header2s[-1].hash], None)
372 print len(self.tracker.shares)
374 def request(self, have, last):
375 #print "REQ", ('[' + ', '.join(map(hex, have)) + ']', hex(last) if last is not None else None)
376 if self.factory.conn.value is not None:
377 self.factory.conn.value.send_getheaders(version=1, have=have, last=last)
379 #@defer.inlineCallbacks
381 def getHeight(self, block_hash):
382 height, last = self.tracker.get_height_and_last(block_hash)
384 self.request([], last)
388 def get_min_height(self, block_hash):
389 height, last = self.tracker.get_height_and_last(block_hash)
391 self.request([], last)
394 def get_highest_height(self):
395 return self.tracker.get_highest_height()
397 if __name__ == '__main__':
398 factory = ClientFactory(bitcoin_data.Mainnet)
399 reactor.connectTCP('127.0.0.1', 8333, factory)
400 h = HeightTracker(factory)
404 @defer.inlineCallbacks
407 yield deferral.sleep(1)
409 print h.getHeight(0xa285c3cb2a90ac7194cca034512748289e2526d9d7ae6ee7523)
411 traceback.print_exc()