2 Implementation of Bitcoin's p2p protocol
5 from __future__ import division
13 from twisted.internet import defer, protocol, reactor, task
14 from twisted.python import log
16 from . import data as bitcoin_data
17 from p2pool.util import variable, datachunker, deferral
19 class TooLong(Exception):
22 class BaseProtocol(protocol.Protocol):
23 def connectionMade(self):
24 self.dataReceived = datachunker.DataChunker(self.dataReceiver())
26 def dataReceiver(self):
29 while start != self._prefix:
30 start = (start + (yield 1))[-len(self._prefix):]
32 command = (yield 12).rstrip('\0')
33 length, = struct.unpack('<I', (yield 4))
35 if length > self.max_net_payload_length:
36 print 'length too long'
44 compressed_payload = yield length
48 d = zlib.decompressobj()
49 payload = d.decompress(compressed_payload, self.max_payload_length)
51 print 'compressed payload expanded too much'
53 assert not len(payload) > self.max_payload_length
55 log.err(None, 'Failure decompressing message:')
58 if len(compressed_payload) > self.max_payload_length:
59 print 'compressed payload expanded too much'
61 payload = compressed_payload
63 if checksum is not None:
64 if hashlib.sha256(hashlib.sha256(payload).digest()).digest()[:4] != checksum:
65 print 'RECV', command, checksum.encode('hex') if checksum is not None else None, repr(payload.encode('hex')), len(payload)
69 type_ = getattr(self, 'message_' + command, None)
71 print 'RECV', command, checksum.encode('hex') if checksum is not None else None, repr(payload.encode('hex')), len(payload)
72 print 'NO TYPE FOR', repr(command)
76 payload2 = type_.unpack(payload)
78 print 'RECV', command, checksum.encode('hex') if checksum is not None else None, repr(payload.encode('hex')), len(payload)
79 log.err(None, 'Error parsing message: (see RECV line)')
82 handler = getattr(self, 'handle_' + command, None)
84 print 'RECV', command, checksum.encode('hex') if checksum is not None else None, repr(payload.encode('hex')), len(payload)
85 print 'NO HANDLER FOR', command
88 #print 'RECV', command, repr(payload2)[:500]
93 print 'RECV', command, len(payload), checksum.encode('hex')[:1000]
94 log.err(None, 'Error handling message: (see RECV line)')
97 def sendPacket(self, command, payload2):
98 if len(command) >= 12:
99 raise ValueError('command too long')
100 type_ = getattr(self, 'message_' + command, None)
102 raise ValueError('invalid command')
103 #print 'SEND', command, repr(payload2)[:500]
104 payload = type_.pack(payload2)
105 if len(payload) > self.max_payload_length:
106 raise TooLong('payload too long')
107 if self.use_checksum:
108 checksum = hashlib.sha256(hashlib.sha256(payload).digest()).digest()[:4]
111 compressed_payload = zlib.compress(payload) if self.compress else payload
112 if len(compressed_payload) > self.max_net_payload_length:
113 raise TooLong('compressed payload too long')
114 data = self._prefix + struct.pack('<12sI', command, len(compressed_payload)) + checksum + compressed_payload
115 self.transport.write(data)
117 def __getattr__(self, attr):
119 if attr.startswith(prefix):
120 command = attr[len(prefix):]
121 return lambda **payload2: self.sendPacket(command, payload2)
122 #return protocol.Protocol.__getattr__(self, attr)
123 raise AttributeError(attr)
125 class Protocol(BaseProtocol):
126 def __init__(self, net):
127 self._prefix = net.BITCOIN_P2P_PREFIX
131 max_payload_length = max_net_payload_length = 1000000
135 def use_checksum(self):
136 return self.version >= 209
141 def connectionMade(self):
142 BaseProtocol.connectionMade(self)
147 time=int(time.time()),
150 address=self.transport.getPeer().host,
151 port=self.transport.getPeer().port,
155 address=self.transport.getHost().host,
156 port=self.transport.getHost().port,
158 nonce=random.randrange(2**64),
163 message_version = bitcoin_data.ComposedType([
164 ('version', bitcoin_data.StructType('<I')),
165 ('services', bitcoin_data.StructType('<Q')),
166 ('time', bitcoin_data.StructType('<Q')),
167 ('addr_to', bitcoin_data.address_type),
168 ('addr_from', bitcoin_data.address_type),
169 ('nonce', bitcoin_data.StructType('<Q')),
170 ('sub_version_num', bitcoin_data.VarStrType()),
171 ('start_height', bitcoin_data.StructType('<I')),
173 def handle_version(self, version, services, time, addr_to, addr_from, nonce, sub_version_num, start_height):
174 #print 'VERSION', locals()
175 self.version_after = version
178 message_verack = bitcoin_data.ComposedType([])
179 def handle_verack(self):
180 self.version = self.version_after
185 self.check_order = deferral.GenericDeferrer(2**256, lambda id, order: self.send_checkorder(id=id, order=order))
186 self.submit_order = deferral.GenericDeferrer(2**256, lambda id, order: self.send_submitorder(id=id, order=order))
187 self.get_block = deferral.ReplyMatcher(lambda hash: self.send_getdata(requests=[dict(type='block', hash=hash)]))
188 self.get_block_header = deferral.ReplyMatcher(lambda hash: self.send_getheaders(version=1, have=[], last=hash))
189 self.get_tx = deferral.ReplyMatcher(lambda hash: self.send_getdata(requests=[dict(type='tx', hash=hash)]))
191 if hasattr(self.factory, 'resetDelay'):
192 self.factory.resetDelay()
193 if hasattr(self.factory, 'gotConnection'):
194 self.factory.gotConnection(self)
196 message_inv = bitcoin_data.ComposedType([
197 ('invs', bitcoin_data.ListType(bitcoin_data.ComposedType([
198 ('type', bitcoin_data.EnumType(bitcoin_data.StructType('<I'), {'tx': 1, 'block': 2})),
199 ('hash', bitcoin_data.HashType()),
202 def handle_inv(self, invs):
204 if inv['type'] == 'tx':
205 self.factory.new_tx.happened(inv['hash'])
206 elif inv['type'] == 'block':
207 self.factory.new_block.happened(inv['hash'])
209 print 'Unknown inv type', item
211 message_getdata = bitcoin_data.ComposedType([
212 ('requests', bitcoin_data.ListType(bitcoin_data.ComposedType([
213 ('type', bitcoin_data.EnumType(bitcoin_data.StructType('<I'), {'tx': 1, 'block': 2})),
214 ('hash', bitcoin_data.HashType()),
217 message_getblocks = bitcoin_data.ComposedType([
218 ('version', bitcoin_data.StructType('<I')),
219 ('have', bitcoin_data.ListType(bitcoin_data.HashType())),
220 ('last', bitcoin_data.PossiblyNone(0, bitcoin_data.HashType())),
222 message_getheaders = bitcoin_data.ComposedType([
223 ('version', bitcoin_data.StructType('<I')),
224 ('have', bitcoin_data.ListType(bitcoin_data.HashType())),
225 ('last', bitcoin_data.PossiblyNone(0, bitcoin_data.HashType())),
227 message_getaddr = bitcoin_data.ComposedType([])
228 message_checkorder = bitcoin_data.ComposedType([
229 ('id', bitcoin_data.HashType()),
230 ('order', bitcoin_data.FixedStrType(60)), # XXX
232 message_submitorder = bitcoin_data.ComposedType([
233 ('id', bitcoin_data.HashType()),
234 ('order', bitcoin_data.FixedStrType(60)), # XXX
237 message_addr = bitcoin_data.ComposedType([
238 ('addrs', bitcoin_data.ListType(bitcoin_data.ComposedType([
239 ('timestamp', bitcoin_data.StructType('<I')),
240 ('address', bitcoin_data.address_type),
243 def handle_addr(self, addrs):
247 message_tx = bitcoin_data.ComposedType([
248 ('tx', bitcoin_data.tx_type),
250 def handle_tx(self, tx):
251 self.get_tx.got_response(bitcoin_data.tx_type.hash256(tx), tx)
253 message_block = bitcoin_data.ComposedType([
254 ('block', bitcoin_data.block_type),
256 def handle_block(self, block):
257 block_hash = bitcoin_data.block_header_type.hash256(block['header'])
258 self.get_block.got_response(block_hash, block)
259 self.get_block_header.got_response(block_hash, block['header'])
261 message_headers = bitcoin_data.ComposedType([
262 ('headers', bitcoin_data.ListType(bitcoin_data.block_type)),
264 def handle_headers(self, headers):
265 for header in headers:
266 header = header['header']
267 self.get_block_header.got_response(bitcoin_data.block_header_type.hash256(header), header)
268 self.factory.new_headers.happened([header['header'] for header in headers])
270 message_reply = bitcoin_data.ComposedType([
271 ('hash', bitcoin_data.HashType()),
272 ('reply', bitcoin_data.EnumType(bitcoin_data.StructType('<I'), {'success': 0, 'failure': 1, 'denied': 2})),
273 ('script', bitcoin_data.PossiblyNone('', bitcoin_data.VarStrType())),
275 def handle_reply(self, hash, reply, script):
276 self.check_order.got_response(hash, dict(reply=reply, script=script))
277 self.submit_order.got_response(hash, dict(reply=reply, script=script))
279 message_ping = bitcoin_data.ComposedType([])
280 def handle_ping(self):
283 message_alert = bitcoin_data.ComposedType([
284 ('message', bitcoin_data.VarStrType()),
285 ('signature', bitcoin_data.VarStrType()),
287 def handle_alert(self, message, signature):
288 print 'ALERT:', (message, signature)
290 def connectionLost(self, reason):
291 if hasattr(self.factory, 'gotConnection'):
292 self.factory.gotConnection(None)
294 class ClientFactory(protocol.ReconnectingClientFactory):
299 def __init__(self, net):
301 self.conn = variable.Variable(None)
303 self.new_block = variable.Event()
304 self.new_tx = variable.Event()
305 self.new_headers = variable.Event()
307 def buildProtocol(self, addr):
308 p = self.protocol(self.net)
312 def gotConnection(self, conn):
315 def getProtocol(self):
316 return self.conn.get_not_none()
318 class HeaderWrapper(object):
320 __slots__ = 'hash previous_hash'.split(' ')
322 def __init__(self, header):
323 self.hash = bitcoin_data.block_header_type.hash256(header)
324 self.previous_hash = header['previous_block']
326 class HeightTracker(object):
327 '''Point this at a factory and let it take care of getting block heights'''
329 def __init__(self, factory):
330 self.factory = factory
331 self.tracker = bitcoin_data.Tracker()
332 self.most_recent = None
334 self._watch1 = self.factory.new_headers.watch(self.heard_headers)
335 self._watch2 = self.factory.new_block.watch(self.heard_block)
337 self.requested = set()
338 self._clear_task = task.LoopingCall(self.requested.clear)
339 self._clear_task.start(60)
341 self.last_notified_size = 0
343 self.updated = variable.Event()
348 highest_head = max(self.tracker.heads, key=lambda h: self.tracker.get_height_and_last(h)[0]) if self.tracker.heads else None
349 height, last = self.tracker.get_height_and_last(highest_head)
354 while cur is not None:
356 if step > cur_height:
358 cur = self.tracker.get_nth_parent_hash(cur, step)
363 have.append(self.tracker.get_nth_parent_hash(highest_head, height - 1))
366 self.request(have, None)
368 for tail in self.tracker.tails:
371 self.request([], tail)
372 for head in self.tracker.heads:
373 if head == highest_head:
375 self.request([head], None)
377 def heard_headers(self, headers):
379 for header in headers:
380 hw = HeaderWrapper(header)
381 if hw.hash in self.tracker.shares:
386 self.updated.happened()
389 if len(self.tracker.shares) > self.last_notified_size + 10:
390 print 'Have %i block headers' % len(self.tracker.shares)
391 self.last_notified_size = len(self.tracker.shares)
393 def heard_block(self, block_hash):
394 self.request([], block_hash)
396 @defer.inlineCallbacks
397 def request(self, have, last):
398 if (tuple(have), last) in self.requested:
400 self.requested.add((tuple(have), last))
401 (yield self.factory.getProtocol()).send_getheaders(version=1, have=have, last=last)
403 #@defer.inlineCallbacks
405 def getHeight(self, block_hash):
406 height, last = self.tracker.get_height_and_last(block_hash)
408 #self.request([], last)
412 def get_min_height(self, block_hash):
413 height, last = self.tracker.get_height_and_last(block_hash)
414 #if last is not None:
415 # self.request([], last)
418 def get_highest_height(self):
419 return self.tracker.get_highest_height()
422 self.factory.new_headers.unwatch(self._watch1)
423 self.factory.new_block.unwatch(self._watch2)
424 self._clear_task.stop()
426 if __name__ == '__main__':
427 factory = ClientFactory(bitcoin_data.Mainnet)
428 reactor.connectTCP('127.0.0.1', 8333, factory)
429 h = HeightTracker(factory)
433 @defer.inlineCallbacks
436 yield deferral.sleep(1)
437 print h.get_min_height(0xa285c3cb2a90ac7194cca034512748289e2526d9d7ae6ee7523)