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 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))
32 if length > self.max_net_payload_length:
33 print "length too long"
41 compressed_payload = yield length
45 d = zlib.decompressobj()
46 payload = d.decompress(compressed_payload, self.max_payload_length)
48 print "compressed payload expanded too much"
50 assert not len(payload) > self.max_payload_length
52 print 'FAILURE DECOMPRESSING'
56 if len(compressed_payload) > self.max_payload_length:
57 print "compressed payload expanded too much"
59 payload = compressed_payload
61 if checksum is not None:
62 if hashlib.sha256(hashlib.sha256(payload).digest()).digest()[:4] != checksum:
63 print 'RECV', command, checksum.encode('hex') if checksum is not None else None, repr(payload.encode('hex')), len(payload)
67 type_ = getattr(self, 'message_' + command, None)
69 print 'RECV', command, checksum.encode('hex') if checksum is not None else None, repr(payload.encode('hex')), len(payload)
70 print 'NO TYPE FOR', repr(command)
74 payload2 = type_.unpack(payload)
76 print 'RECV', command, checksum.encode('hex') if checksum is not None else None, repr(payload.encode('hex')), len(payload)
80 handler = getattr(self, 'handle_' + command, None)
82 print 'RECV', command, checksum.encode('hex') if checksum is not None else None, repr(payload.encode('hex')), len(payload)
83 print 'NO HANDLER FOR', command
86 #print 'RECV', command, repr(payload2)[:500]
91 print 'RECV', command, checksum.encode('hex') if checksum is not None else None, repr(payload.encode('hex')), len(payload)
95 def sendPacket(self, command, payload2):
96 if len(command) >= 12:
97 raise ValueError('command too long')
98 type_ = getattr(self, 'message_' + command, None)
100 raise ValueError('invalid command')
101 #print 'SEND', command, repr(payload2)[:500]
102 payload = type_.pack(payload2)
103 if len(payload) > self.max_payload_length:
104 raise ValueError('payload too long')
105 if self.use_checksum:
106 checksum = hashlib.sha256(hashlib.sha256(payload).digest()).digest()[:4]
109 compressed_payload = zlib.compress(payload) if self.compress else payload
110 if len(compressed_payload) > self.max_net_payload_length:
111 raise ValueError('compressed payload too long')
112 data = self._prefix + struct.pack('<12sI', command, len(compressed_payload)) + checksum + compressed_payload
113 self.transport.write(data)
114 print "SEND", command, len(compressed_payload)
116 def __getattr__(self, attr):
118 if attr.startswith(prefix):
119 command = attr[len(prefix):]
120 return lambda **payload2: self.sendPacket(command, payload2)
121 #return protocol.Protocol.__getattr__(self, attr)
122 raise AttributeError(attr)
124 class Protocol(BaseProtocol):
125 def __init__(self, net):
126 self._prefix = net.BITCOIN_P2P_PREFIX
130 max_payload_length = max_net_payload_length = 1000000
134 def use_checksum(self):
135 return self.version >= 209
140 def connectionMade(self):
141 BaseProtocol.connectionMade(self)
146 time=int(time.time()),
149 address=self.transport.getPeer().host,
150 port=self.transport.getPeer().port,
154 address=self.transport.getHost().host,
155 port=self.transport.getHost().port,
157 nonce=random.randrange(2**64),
162 message_version = bitcoin_data.ComposedType([
163 ('version', bitcoin_data.StructType('<I')),
164 ('services', bitcoin_data.StructType('<Q')),
165 ('time', bitcoin_data.StructType('<Q')),
166 ('addr_to', bitcoin_data.address_type),
167 ('addr_from', bitcoin_data.address_type),
168 ('nonce', bitcoin_data.StructType('<Q')),
169 ('sub_version_num', bitcoin_data.VarStrType()),
170 ('start_height', bitcoin_data.StructType('<I')),
172 def handle_version(self, version, services, time, addr_to, addr_from, nonce, sub_version_num, start_height):
173 #print 'VERSION', locals()
174 self.version_after = version
177 message_verack = bitcoin_data.ComposedType([])
178 def handle_verack(self):
179 self.version = self.version_after
184 self.check_order = deferral.GenericDeferrer(2**256, lambda id, order: self.send_checkorder(id=id, order=order))
185 self.submit_order = deferral.GenericDeferrer(2**256, lambda id, order: self.send_submitorder(id=id, order=order))
186 self.get_block = deferral.ReplyMatcher(lambda hash: self.send_getdata(requests=[dict(type='block', hash=hash)]))
187 self.get_block_header = deferral.ReplyMatcher(lambda hash: self.send_getheaders(version=1, have=[], last=hash))
188 self.get_tx = deferral.ReplyMatcher(lambda hash: self.send_getdata(requests=[dict(type='tx', hash=hash)]))
190 if hasattr(self.factory, 'resetDelay'):
191 self.factory.resetDelay()
192 if hasattr(self.factory, 'gotConnection'):
193 self.factory.gotConnection(self)
195 message_inv = bitcoin_data.ComposedType([
196 ('invs', bitcoin_data.ListType(bitcoin_data.ComposedType([
197 ('type', bitcoin_data.EnumType(bitcoin_data.StructType('<I'), {'tx': 1, 'block': 2})),
198 ('hash', bitcoin_data.HashType()),
201 def handle_inv(self, invs):
203 if inv['type'] == 'tx':
204 self.factory.new_tx.happened(inv['hash'])
205 elif inv['type'] == 'block':
206 self.factory.new_block.happened(inv['hash'])
208 print 'Unknown inv type', item
210 message_getdata = bitcoin_data.ComposedType([
211 ('requests', bitcoin_data.ListType(bitcoin_data.ComposedType([
212 ('type', bitcoin_data.EnumType(bitcoin_data.StructType('<I'), {'tx': 1, 'block': 2})),
213 ('hash', bitcoin_data.HashType()),
216 message_getblocks = bitcoin_data.ComposedType([
217 ('version', bitcoin_data.StructType('<I')),
218 ('have', bitcoin_data.ListType(bitcoin_data.HashType())),
219 ('last', bitcoin_data.PossiblyNone(0, bitcoin_data.HashType())),
221 message_getheaders = bitcoin_data.ComposedType([
222 ('version', bitcoin_data.StructType('<I')),
223 ('have', bitcoin_data.ListType(bitcoin_data.HashType())),
224 ('last', bitcoin_data.PossiblyNone(0, bitcoin_data.HashType())),
226 message_getaddr = bitcoin_data.ComposedType([])
227 message_checkorder = bitcoin_data.ComposedType([
228 ('id', bitcoin_data.HashType()),
229 ('order', bitcoin_data.FixedStrType(60)), # XXX
231 message_submitorder = bitcoin_data.ComposedType([
232 ('id', bitcoin_data.HashType()),
233 ('order', bitcoin_data.FixedStrType(60)), # XXX
236 message_addr = bitcoin_data.ComposedType([
237 ('addrs', bitcoin_data.ListType(bitcoin_data.ComposedType([
238 ('timestamp', bitcoin_data.StructType('<I')),
239 ('address', bitcoin_data.address_type),
242 def handle_addr(self, addrs):
246 message_tx = bitcoin_data.ComposedType([
247 ('tx', bitcoin_data.tx_type),
249 def handle_tx(self, tx):
250 self.get_tx.got_response(bitcoin_data.tx_type.hash256(tx), tx)
252 message_block = bitcoin_data.ComposedType([
253 ('block', bitcoin_data.block_type),
255 def handle_block(self, block):
256 block_hash = bitcoin_data.block_header_type.hash256(block['header'])
257 self.get_block.got_response(block_hash, block)
258 self.get_block_header.got_response(block_hash, block['header'])
260 message_headers = bitcoin_data.ComposedType([
261 ('headers', bitcoin_data.ListType(bitcoin_data.block_type)),
263 def handle_headers(self, headers):
264 for header in headers:
265 header = header['header']
266 self.get_block_header.got_response(bitcoin_data.block_header_type.hash256(header), header)
267 self.factory.new_headers.happened([header['header'] for header in headers])
269 message_reply = bitcoin_data.ComposedType([
270 ('hash', bitcoin_data.HashType()),
271 ('reply', bitcoin_data.EnumType(bitcoin_data.StructType('<I'), {'success': 0, 'failure': 1, 'denied': 2})),
272 ('script', bitcoin_data.PossiblyNone('', bitcoin_data.VarStrType())),
274 def handle_reply(self, hash, reply, script):
275 self.check_order.got_response(hash, dict(reply=reply, script=script))
276 self.submit_order.got_response(hash, dict(reply=reply, script=script))
278 message_ping = bitcoin_data.ComposedType([])
279 def handle_ping(self):
282 message_alert = bitcoin_data.ComposedType([
283 ('message', bitcoin_data.VarStrType()),
284 ('signature', bitcoin_data.VarStrType()),
286 def handle_alert(self, message, signature):
287 print 'ALERT:', (message, signature)
289 def connectionLost(self, reason):
290 if hasattr(self.factory, 'gotConnection'):
291 self.factory.gotConnection(None)
293 class ClientFactory(protocol.ReconnectingClientFactory):
298 def __init__(self, net):
300 self.conn = variable.Variable(None)
302 self.new_block = variable.Event()
303 self.new_tx = variable.Event()
304 self.new_headers = variable.Event()
306 def buildProtocol(self, addr):
307 p = self.protocol(self.net)
311 def gotConnection(self, conn):
314 def getProtocol(self):
315 return self.conn.get_not_none()
317 class HeaderWrapper(object):
318 def __init__(self, header):
319 self.hash = bitcoin_data.block_header_type.hash256(header)
320 self.previous_hash = header['previous_block']
322 class HeightTracker(object):
323 '''Point this at a factory and let it take care of getting block heights'''
325 def __init__(self, factory):
326 self.factory = factory
327 self.tracker = bitcoin_data.Tracker()
328 self.most_recent = None
330 self._watch1 = self.factory.new_headers.watch(self.heard_headers)
331 self._watch2 = self.factory.new_block.watch(self.heard_block)
333 self.requested = set()
334 self._clear_task = task.LoopingCall(self.requested.clear)
335 self._clear_task.start(60)
340 highest_head = max(self.tracker.heads, key=lambda h: self.tracker.get_height_and_last(h)[0]) if self.tracker.heads else None
341 height, last = self.tracker.get_height_and_last(highest_head)
346 while cur is not None:
348 if step > cur_height:
350 cur = self.tracker.get_nth_parent_hash(cur, step)
355 have.append(self.tracker.get_nth_parent_hash(highest_head, height - 1))
358 self.request(have, None)
360 for tail in self.tracker.tails:
363 self.request([], tail)
364 for head in self.tracker.heads:
365 self.request([head], None)
367 def heard_headers(self, headers):
368 for header in headers:
369 self.tracker.add(HeaderWrapper(header))
372 def heard_block(self, block_hash):
373 self.request([], block_hash)
375 @defer.inlineCallbacks
376 def request(self, have, last):
377 if (tuple(have), last) in self.requested:
379 self.requested.add((tuple(have), last))
380 (yield self.factory.getProtocol()).send_getheaders(version=1, have=have, last=last)
382 #@defer.inlineCallbacks
384 def getHeight(self, block_hash):
385 height, last = self.tracker.get_height_and_last(block_hash)
387 self.request([], last)
391 def get_min_height(self, block_hash):
392 height, last = self.tracker.get_height_and_last(block_hash)
394 self.request([], last)
397 def get_highest_height(self):
398 return self.tracker.get_highest_height()
401 self.factory.new_headers.unwatch(self._watch1)
402 self.factory.new_block.unwatch(self._watch2)
403 self._clear_task.stop()
405 if __name__ == '__main__':
406 factory = ClientFactory(bitcoin_data.Mainnet)
407 reactor.connectTCP('127.0.0.1', 8333, factory)
408 h = HeightTracker(factory)
412 @defer.inlineCallbacks
415 yield deferral.sleep(1)
416 print h.get_min_height(0xa285c3cb2a90ac7194cca034512748289e2526d9d7ae6ee7523)