p2pool/p2p.py

   1 from __future__ import division
   2
   3 import math
   4 import random
   5 import sys
   6 import time
   7
   8 from twisted.internet import defer, protocol, reactor
   9 from twisted.python import failure, log
  10
  11 import p2pool
  12 from p2pool import data as p2pool_data
  13 from p2pool.bitcoin import data as bitcoin_data
  14 from p2pool.util import deferral, p2protocol, pack, variable
  15
  16 class PeerMisbehavingError(Exception):
  17     pass
  18
  19
  20 def fragment(f, **kwargs):
  21     try:
  22         f(**kwargs)
  23     except p2protocol.TooLong:
  24         fragment(f, **dict((k, v[:len(v)//2]) for k, v in kwargs.iteritems()))
  25         fragment(f, **dict((k, v[len(v)//2:]) for k, v in kwargs.iteritems()))
  26
  27 class Protocol(p2protocol.Protocol):
  28     VERSION = 1300
  29
  30     max_remembered_txs_size = 2500000
  31
  32     def __init__(self, node, incoming):
  33         p2protocol.Protocol.__init__(self, node.net.PREFIX, 1000000, node.traffic_happened)
  34         self.node = node
  35         self.incoming = incoming
  36
  37         self.other_version = None
  38         self.connected2 = False
  39
  40     def connectionMade(self):
  41         self.factory.proto_made_connection(self)
  42
  43         self.connection_lost_event = variable.Event()
  44
  45         self.addr = self.transport.getPeer().host, self.transport.getPeer().port
  46
  47         self.send_version(
  48             version=self.VERSION,
  49             services=0,
  50             addr_to=dict(
  51                 services=0,
  52                 address=self.transport.getPeer().host,
  53                 port=self.transport.getPeer().port,
  54             ),
  55             addr_from=dict(
  56                 services=0,
  57                 address=self.transport.getHost().host,
  58                 port=self.transport.getHost().port,
  59             ),
  60             nonce=self.node.nonce,
  61             sub_version=p2pool.__version__,
  62             mode=1,
  63             best_share_hash=self.node.best_share_hash_func(),
  64         )
  65
  66         self.timeout_delayed = reactor.callLater(10, self._connect_timeout)
  67
  68         self.get_shares = deferral.GenericDeferrer(
  69             max_id=2**256,
  70             func=lambda id, hashes, parents, stops: self.send_sharereq(id=id, hashes=hashes, parents=parents, stops=stops),
  71             timeout=15,
  72             on_timeout=self.disconnect,
  73         )
  74
  75         self.remote_tx_hashes = set() # view of peer's known_txs # not actually initially empty, but sending txs instead of tx hashes won't hurt
  76         self.remote_remembered_txs_size = 0
  77
  78         self.remembered_txs = {} # view of peer's mining_txs
  79         self.remembered_txs_size = 0
  80         self.known_txs_cache = {}
  81
  82     def _connect_timeout(self):
  83         self.timeout_delayed = None
  84         print 'Handshake timed out, disconnecting from %s:%i' % self.addr
  85         self.disconnect()
  86
  87     def packetReceived(self, command, payload2):
  88         try:
  89             if command != 'version' and not self.connected2:
  90                 raise PeerMisbehavingError('first message was not version message')
  91             p2protocol.Protocol.packetReceived(self, command, payload2)
  92         except PeerMisbehavingError, e:
  93             print 'Peer %s:%i misbehaving, will drop and ban. Reason:' % self.addr, e.message
  94             self.badPeerHappened()
  95
  96     def badPeerHappened(self):
  97         print "Bad peer banned:", self.addr
  98         self.disconnect()
  99         if self.transport.getPeer().host != '127.0.0.1': # never ban localhost
 100             self.node.bans[self.transport.getPeer().host] = time.time() + 60*60
 101
 102     def _timeout(self):
 103         self.timeout_delayed = None
 104         print 'Connection timed out, disconnecting from %s:%i' % self.addr
 105         self.disconnect()
 106
 107     message_version = pack.ComposedType([
 108         ('version', pack.IntType(32)),
 109         ('services', pack.IntType(64)),
 110         ('addr_to', bitcoin_data.address_type),
 111         ('addr_from', bitcoin_data.address_type),
 112         ('nonce', pack.IntType(64)),
 113         ('sub_version', pack.VarStrType()),
 114         ('mode', pack.IntType(32)), # always 1 for legacy compatibility
 115         ('best_share_hash', pack.PossiblyNoneType(0, pack.IntType(256))),
 116     ])
 117     def handle_version(self, version, services, addr_to, addr_from, nonce, sub_version, mode, best_share_hash):
 118         if self.other_version is not None:
 119             raise PeerMisbehavingError('more than one version message')
 120         if version < 1300:
 121             raise PeerMisbehavingError('peer too old')
 122
 123         self.other_version = version
 124         self.other_sub_version = sub_version[:512]
 125         self.other_services = services
 126
 127         if nonce == self.node.nonce:
 128             raise PeerMisbehavingError('was connected to self')
 129         if nonce in self.node.peers:
 130             if p2pool.DEBUG:
 131                 print 'Detected duplicate connection, disconnecting from %s:%i' % self.addr
 132             self.disconnect()
 133             return
 134
 135         self.nonce = nonce
 136         self.connected2 = True
 137
 138         self.timeout_delayed.cancel()
 139         self.timeout_delayed = reactor.callLater(100, self._timeout)
 140
 141         old_dataReceived = self.dataReceived
 142         def new_dataReceived(data):
 143             if self.timeout_delayed is not None:
 144                 self.timeout_delayed.reset(100)
 145             old_dataReceived(data)
 146         self.dataReceived = new_dataReceived
 147
 148         self.factory.proto_connected(self)
 149
 150         self._stop_thread = deferral.run_repeatedly(lambda: [
 151             self.send_ping(),
 152         random.expovariate(1/100)][-1])
 153
 154         if self.node.advertise_ip:
 155             self._stop_thread2 = deferral.run_repeatedly(lambda: [
 156                 self.send_addrme(port=self.node.serverfactory.listen_port.getHost().port) if self.node.serverfactory.listen_port is not None else None,
 157             random.expovariate(1/(100*len(self.node.peers) + 1))][-1])
 158
 159         if best_share_hash is not None:
 160             self.node.handle_share_hashes([best_share_hash], self)
 161
 162         def update_remote_view_of_my_known_txs(before, after):
 163             added = set(after) - set(before)
 164             removed = set(before) - set(after)
 165             if added:
 166                 self.send_have_tx(tx_hashes=list(added))
 167             if removed:
 168                 self.send_losing_tx(tx_hashes=list(removed))
 169
 170                 # cache forgotten txs here for a little while so latency of "losing_tx" packets doesn't cause problems
 171                 key = max(self.known_txs_cache) + 1 if self.known_txs_cache else 0
 172                 self.known_txs_cache[key] = dict((h, before[h]) for h in removed)
 173                 reactor.callLater(20, self.known_txs_cache.pop, key)
 174         watch_id = self.node.known_txs_var.transitioned.watch(update_remote_view_of_my_known_txs)
 175         self.connection_lost_event.watch(lambda: self.node.known_txs_var.transitioned.unwatch(watch_id))
 176
 177         self.send_have_tx(tx_hashes=self.node.known_txs_var.value.keys())
 178
 179         def update_remote_view_of_my_mining_txs(before, after):
 180             added = set(after) - set(before)
 181             removed = set(before) - set(after)
 182             if added:
 183                 self.remote_remembered_txs_size += sum(100 + bitcoin_data.tx_type.packed_size(after[x]) for x in added)
 184                 assert self.remote_remembered_txs_size <= self.max_remembered_txs_size
 185                 fragment(self.send_remember_tx, tx_hashes=[x for x in added if x in self.remote_tx_hashes], txs=[after[x] for x in added if x not in self.remote_tx_hashes])
 186             if removed:
 187                 self.send_forget_tx(tx_hashes=list(removed))
 188                 self.remote_remembered_txs_size -= sum(100 + bitcoin_data.tx_type.packed_size(before[x]) for x in removed)
 189         watch_id2 = self.node.mining_txs_var.transitioned.watch(update_remote_view_of_my_mining_txs)
 190         self.connection_lost_event.watch(lambda: self.node.mining_txs_var.transitioned.unwatch(watch_id2))
 191
 192         self.remote_remembered_txs_size += sum(100 + bitcoin_data.tx_type.packed_size(x) for x in self.node.mining_txs_var.value.values())
 193         assert self.remote_remembered_txs_size <= self.max_remembered_txs_size
 194         fragment(self.send_remember_tx, tx_hashes=[], txs=self.node.mining_txs_var.value.values())
 195
 196     message_ping = pack.ComposedType([])
 197     def handle_ping(self):
 198         pass
 199
 200     message_addrme = pack.ComposedType([
 201         ('port', pack.IntType(16)),
 202     ])
 203     def handle_addrme(self, port):
 204         host = self.transport.getPeer().host
 205         #print 'addrme from', host, port
 206         if host == '127.0.0.1':
 207             if random.random() < .8 and self.node.peers:
 208                 random.choice(self.node.peers.values()).send_addrme(port=port) # services...
 209         else:
 210             self.node.got_addr((self.transport.getPeer().host, port), self.other_services, int(time.time()))
 211             if random.random() < .8 and self.node.peers:
 212                 random.choice(self.node.peers.values()).send_addrs(addrs=[
 213                     dict(
 214                         address=dict(
 215                             services=self.other_services,
 216                             address=host,
 217                             port=port,
 218                         ),
 219                         timestamp=int(time.time()),
 220                     ),
 221                 ])
 222
 223     message_addrs = pack.ComposedType([
 224         ('addrs', pack.ListType(pack.ComposedType([
 225             ('timestamp', pack.IntType(64)),
 226             ('address', bitcoin_data.address_type),
 227         ]))),
 228     ])
 229     def handle_addrs(self, addrs):
 230         for addr_record in addrs:
 231             self.node.got_addr((addr_record['address']['address'], addr_record['address']['port']), addr_record['address']['services'], min(int(time.time()), addr_record['timestamp']))
 232             if random.random() < .8 and self.node.peers:
 233                 random.choice(self.node.peers.values()).send_addrs(addrs=[addr_record])
 234
 235     message_getaddrs = pack.ComposedType([
 236         ('count', pack.IntType(32)),
 237     ])
 238     def handle_getaddrs(self, count):
 239         if count > 100:
 240             count = 100
 241         self.send_addrs(addrs=[
 242             dict(
 243                 timestamp=int(self.node.addr_store[host, port][2]),
 244                 address=dict(
 245                     services=self.node.addr_store[host, port][0],
 246                     address=host,
 247                     port=port,
 248                 ),
 249             ) for host, port in
 250             self.node.get_good_peers(count)
 251         ])
 252
 253     message_shares = pack.ComposedType([
 254         ('shares', pack.ListType(p2pool_data.share_type)),
 255     ])
 256     def handle_shares(self, shares):
 257         result = []
 258         for wrappedshare in shares:
 259             if wrappedshare['type'] < p2pool_data.Share.VERSION: continue
 260             share = p2pool_data.load_share(wrappedshare, self.node.net, self.addr)
 261             if wrappedshare['type'] >= 13:
 262                 txs = []
 263                 for tx_hash in share.share_info['new_transaction_hashes']:
 264                     if tx_hash in self.node.known_txs_var.value:
 265                         tx = self.node.known_txs_var.value[tx_hash]
 266                     else:
 267                         for cache in self.known_txs_cache.itervalues():
 268                             if tx_hash in cache:
 269                                 tx = cache[tx_hash]
 270                                 print 'Transaction %064x rescued from peer latency cache!' % (tx_hash,)
 271                                 break
 272                         else:
 273                             print >>sys.stderr, 'Peer referenced unknown transaction %064x, disconnecting' % (tx_hash,)
 274                             self.disconnect()
 275                             return
 276                     txs.append(tx)
 277             else:
 278                 txs = None
 279
 280             result.append((share, txs))
 281
 282         self.node.handle_shares(result, self)
 283
 284     def sendShares(self, shares, tracker, known_txs, include_txs_with=[]):
 285         tx_hashes = set()
 286         for share in shares:
 287             if share.VERSION >= 13:
 288                 # send full transaction for every new_transaction_hash that peer does not know
 289                 for tx_hash in share.share_info['new_transaction_hashes']:
 290                     assert tx_hash in known_txs, 'tried to broadcast share without knowing all its new transactions'
 291                     if tx_hash not in self.remote_tx_hashes:
 292                         tx_hashes.add(tx_hash)
 293                 continue
 294             if share.hash in include_txs_with:
 295                 x = share.get_other_tx_hashes(tracker)
 296                 if x is not None:
 297                     tx_hashes.update(x)
 298
 299         hashes_to_send = [x for x in tx_hashes if x not in self.node.mining_txs_var.value and x in known_txs]
 300
 301         new_remote_remembered_txs_size = self.remote_remembered_txs_size + sum(100 + bitcoin_data.tx_type.packed_size(known_txs[x]) for x in hashes_to_send)
 302         if new_remote_remembered_txs_size > self.max_remembered_txs_size:
 303             raise ValueError('shares have too many txs')
 304         self.remote_remembered_txs_size = new_remote_remembered_txs_size
 305
 306         fragment(self.send_remember_tx, tx_hashes=[x for x in hashes_to_send if x in self.remote_tx_hashes], txs=[known_txs[x] for x in hashes_to_send if x not in self.remote_tx_hashes])
 307
 308         fragment(self.send_shares, shares=[share.as_share() for share in shares])
 309
 310         self.send_forget_tx(tx_hashes=hashes_to_send)
 311
 312         self.remote_remembered_txs_size -= sum(100 + bitcoin_data.tx_type.packed_size(known_txs[x]) for x in hashes_to_send)
 313
 314
 315     message_sharereq = pack.ComposedType([
 316         ('id', pack.IntType(256)),
 317         ('hashes', pack.ListType(pack.IntType(256))),
 318         ('parents', pack.VarIntType()),
 319         ('stops', pack.ListType(pack.IntType(256))),
 320     ])
 321     def handle_sharereq(self, id, hashes, parents, stops):
 322         shares = self.node.handle_get_shares(hashes, parents, stops, self)
 323         try:
 324             self.send_sharereply(id=id, result='good', shares=[share.as_share() for share in shares])
 325         except p2protocol.TooLong:
 326             self.send_sharereply(id=id, result='too long', shares=[])
 327
 328     message_sharereply = pack.ComposedType([
 329         ('id', pack.IntType(256)),
 330         ('result', pack.EnumType(pack.VarIntType(), {0: 'good', 1: 'too long', 2: 'unk2', 3: 'unk3', 4: 'unk4', 5: 'unk5', 6: 'unk6'})),
 331         ('shares', pack.ListType(p2pool_data.share_type)),
 332     ])
 333     class ShareReplyError(Exception): pass
 334     def handle_sharereply(self, id, result, shares):
 335         if result == 'good':
 336             res = [p2pool_data.load_share(share, self.node.net, self.addr) for share in shares if share['type'] >= p2pool_data.Share.VERSION]
 337         else:
 338             res = failure.Failure(self.ShareReplyError(result))
 339         self.get_shares.got_response(id, res)
 340
 341
 342     message_bestblock = pack.ComposedType([
 343         ('header', bitcoin_data.block_header_type),
 344     ])
 345     def handle_bestblock(self, header):
 346         self.node.handle_bestblock(header, self)
 347
 348
 349     message_have_tx = pack.ComposedType([
 350         ('tx_hashes', pack.ListType(pack.IntType(256))),
 351     ])
 352     def handle_have_tx(self, tx_hashes):
 353         #assert self.remote_tx_hashes.isdisjoint(tx_hashes)
 354         self.remote_tx_hashes.update(tx_hashes)
 355         while len(self.remote_tx_hashes) > 10000:
 356             self.remote_tx_hashes.pop()
 357     message_losing_tx = pack.ComposedType([
 358         ('tx_hashes', pack.ListType(pack.IntType(256))),
 359     ])
 360     def handle_losing_tx(self, tx_hashes):
 361         #assert self.remote_tx_hashes.issuperset(tx_hashes)
 362         self.remote_tx_hashes.difference_update(tx_hashes)
 363
 364
 365     message_remember_tx = pack.ComposedType([
 366         ('tx_hashes', pack.ListType(pack.IntType(256))),
 367         ('txs', pack.ListType(bitcoin_data.tx_type)),
 368     ])
 369     def handle_remember_tx(self, tx_hashes, txs):
 370         for tx_hash in tx_hashes:
 371             if tx_hash in self.remembered_txs:
 372                 print >>sys.stderr, 'Peer referenced transaction twice, disconnecting'
 373                 self.disconnect()
 374                 return
 375
 376             if tx_hash in self.node.known_txs_var.value:
 377                 tx = self.node.known_txs_var.value[tx_hash]
 378             else:
 379                 for cache in self.known_txs_cache.itervalues():
 380                     if tx_hash in cache:
 381                         tx = cache[tx_hash]
 382                         print 'Transaction %064x rescued from peer latency cache!' % (tx_hash,)
 383                         break
 384                 else:
 385                     print >>sys.stderr, 'Peer referenced unknown transaction %064x, disconnecting' % (tx_hash,)
 386                     self.disconnect()
 387                     return
 388
 389             self.remembered_txs[tx_hash] = tx
 390             self.remembered_txs_size += 100 + bitcoin_data.tx_type.packed_size(tx)
 391         new_known_txs = dict(self.node.known_txs_var.value)
 392         warned = False
 393         for tx in txs:
 394             tx_hash = bitcoin_data.hash256(bitcoin_data.tx_type.pack(tx))
 395             if tx_hash in self.remembered_txs:
 396                 print >>sys.stderr, 'Peer referenced transaction twice, disconnecting'
 397                 self.disconnect()
 398                 return
 399
 400             if tx_hash in self.node.known_txs_var.value and not warned:
 401                 print 'Peer sent entire transaction %064x that was already received' % (tx_hash,)
 402                 warned = True
 403
 404             self.remembered_txs[tx_hash] = tx
 405             self.remembered_txs_size += 100 + bitcoin_data.tx_type.packed_size(tx)
 406             new_known_txs[tx_hash] = tx
 407         self.node.known_txs_var.set(new_known_txs)
 408         if self.remembered_txs_size >= self.max_remembered_txs_size:
 409             raise PeerMisbehavingError('too much transaction data stored')
 410     message_forget_tx = pack.ComposedType([
 411         ('tx_hashes', pack.ListType(pack.IntType(256))),
 412     ])
 413     def handle_forget_tx(self, tx_hashes):
 414         for tx_hash in tx_hashes:
 415             self.remembered_txs_size -= 100 + bitcoin_data.tx_type.packed_size(self.remembered_txs[tx_hash])
 416             assert self.remembered_txs_size >= 0
 417             del self.remembered_txs[tx_hash]
 418
 419
 420     def connectionLost(self, reason):
 421         self.connection_lost_event.happened()
 422         if self.timeout_delayed is not None:
 423             self.timeout_delayed.cancel()
 424         if self.connected2:
 425             self.factory.proto_disconnected(self, reason)
 426             self._stop_thread()
 427             if self.node.advertise_ip:
 428                 self._stop_thread2()
 429             self.connected2 = False
 430         self.factory.proto_lost_connection(self, reason)
 431         if p2pool.DEBUG:
 432             print "Peer connection lost:", self.addr, reason
 433         self.get_shares.respond_all(reason)
 434
 435     @defer.inlineCallbacks
 436     def do_ping(self):
 437         start = reactor.seconds()
 438         yield self.get_shares(hashes=[0], parents=0, stops=[])
 439         end = reactor.seconds()
 440         defer.returnValue(end - start)
 441
 442 class ServerFactory(protocol.ServerFactory):
 443     def __init__(self, node, max_conns):
 444         self.node = node
 445         self.max_conns = max_conns
 446
 447         self.conns = {}
 448         self.running = False
 449         self.listen_port = None
 450
 451     def buildProtocol(self, addr):
 452         if sum(self.conns.itervalues()) >= self.max_conns or self.conns.get(self._host_to_ident(addr.host), 0) >= 3:
 453             return None
 454         if addr.host in self.node.bans and self.node.bans[addr.host] > time.time():
 455             return None
 456         p = Protocol(self.node, True)
 457         p.factory = self
 458         if p2pool.DEBUG:
 459             print "Got peer connection from:", addr
 460         return p
 461
 462     def _host_to_ident(self, host):
 463         a, b, c, d = host.split('.')
 464         return a, b
 465
 466     def proto_made_connection(self, proto):
 467         ident = self._host_to_ident(proto.transport.getPeer().host)
 468         self.conns[ident] = self.conns.get(ident, 0) + 1
 469     def proto_lost_connection(self, proto, reason):
 470         ident = self._host_to_ident(proto.transport.getPeer().host)
 471         self.conns[ident] -= 1
 472         if not self.conns[ident]:
 473             del self.conns[ident]
 474
 475     def proto_connected(self, proto):
 476         self.node.got_conn(proto)
 477     def proto_disconnected(self, proto, reason):
 478         self.node.lost_conn(proto, reason)
 479
 480     def start(self):
 481         assert not self.running
 482         self.running = True
 483
 484         def attempt_listen():
 485             if self.running:
 486                 self.listen_port = reactor.listenTCP(self.node.port, self)
 487         deferral.retry('Error binding to P2P port:', traceback=False)(attempt_listen)()
 488
 489     def stop(self):
 490         assert self.running
 491         self.running = False
 492
 493         return self.listen_port.stopListening()
 494
 495 class ClientFactory(protocol.ClientFactory):
 496     def __init__(self, node, desired_conns, max_attempts):
 497         self.node = node
 498         self.desired_conns = desired_conns
 499         self.max_attempts = max_attempts
 500
 501         self.attempts = set()
 502         self.conns = set()
 503         self.running = False
 504
 505     def _host_to_ident(self, host):
 506         a, b, c, d = host.split('.')
 507         return a, b
 508
 509     def buildProtocol(self, addr):
 510         p = Protocol(self.node, False)
 511         p.factory = self
 512         return p
 513
 514     def startedConnecting(self, connector):
 515         ident = self._host_to_ident(connector.getDestination().host)
 516         if ident in self.attempts:
 517             raise AssertionError('already have attempt')
 518         self.attempts.add(ident)
 519
 520     def clientConnectionFailed(self, connector, reason):
 521         self.attempts.remove(self._host_to_ident(connector.getDestination().host))
 522
 523     def clientConnectionLost(self, connector, reason):
 524         self.attempts.remove(self._host_to_ident(connector.getDestination().host))
 525
 526     def proto_made_connection(self, proto):
 527         pass
 528     def proto_lost_connection(self, proto, reason):
 529         pass
 530
 531     def proto_connected(self, proto):
 532         self.conns.add(proto)
 533         self.node.got_conn(proto)
 534     def proto_disconnected(self, proto, reason):
 535         self.conns.remove(proto)
 536         self.node.lost_conn(proto, reason)
 537
 538     def start(self):
 539         assert not self.running
 540         self.running = True
 541         self._stop_thinking = deferral.run_repeatedly(self._think)
 542     def stop(self):
 543         assert self.running
 544         self.running = False
 545         self._stop_thinking()
 546
 547     def _think(self):
 548         try:
 549             if len(self.conns) < self.desired_conns and len(self.attempts) < self.max_attempts and self.node.addr_store:
 550                 (host, port), = self.node.get_good_peers(1)
 551
 552                 if self._host_to_ident(host) in self.attempts:
 553                     pass
 554                 elif host in self.node.bans and self.node.bans[host] > time.time():
 555                     pass
 556                 else:
 557                     #print 'Trying to connect to', host, port
 558                     reactor.connectTCP(host, port, self, timeout=5)
 559         except:
 560             log.err()
 561
 562         return random.expovariate(1/1)
 563
 564 class SingleClientFactory(protocol.ReconnectingClientFactory):
 565     def __init__(self, node):
 566         self.node = node
 567
 568     def buildProtocol(self, addr):
 569         p = Protocol(self.node, incoming=False)
 570         p.factory = self
 571         return p
 572
 573     def proto_made_connection(self, proto):
 574         pass
 575     def proto_lost_connection(self, proto, reason):
 576         pass
 577
 578     def proto_connected(self, proto):
 579         self.resetDelay()
 580         self.node.got_conn(proto)
 581     def proto_disconnected(self, proto, reason):
 582         self.node.lost_conn(proto, reason)
 583
 584 class Node(object):
 585     def __init__(self, best_share_hash_func, port, net, addr_store={}, connect_addrs=set(), desired_outgoing_conns=10, max_outgoing_attempts=30, max_incoming_conns=50, preferred_storage=1000, known_txs_var=variable.Variable({}), mining_txs_var=variable.Variable({}), advertise_ip=True):
 586         self.best_share_hash_func = best_share_hash_func
 587         self.port = port
 588         self.net = net
 589         self.addr_store = dict(addr_store)
 590         self.connect_addrs = connect_addrs
 591         self.preferred_storage = preferred_storage
 592         self.known_txs_var = known_txs_var
 593         self.mining_txs_var = mining_txs_var
 594         self.advertise_ip = advertise_ip
 595
 596         self.traffic_happened = variable.Event()
 597         self.nonce = random.randrange(2**64)
 598         self.peers = {}
 599         self.bans = {} # address -> end_time
 600         self.clientfactory = ClientFactory(self, desired_outgoing_conns, max_outgoing_attempts)
 601         self.serverfactory = ServerFactory(self, max_incoming_conns)
 602         self.running = False
 603
 604     def start(self):
 605         if self.running:
 606             raise ValueError('already running')
 607
 608         self.clientfactory.start()
 609         self.serverfactory.start()
 610         self.singleclientconnectors = [reactor.connectTCP(addr, port, SingleClientFactory(self)) for addr, port in self.connect_addrs]
 611
 612         self.running = True
 613
 614         self._stop_thinking = deferral.run_repeatedly(self._think)
 615
 616     def _think(self):
 617         try:
 618             if len(self.addr_store) < self.preferred_storage and self.peers:
 619                 random.choice(self.peers.values()).send_getaddrs(count=8)
 620         except:
 621             log.err()
 622
 623         return random.expovariate(1/20)
 624
 625     @defer.inlineCallbacks
 626     def stop(self):
 627         if not self.running:
 628             raise ValueError('already stopped')
 629
 630         self.running = False
 631
 632         self._stop_thinking()
 633         yield self.clientfactory.stop()
 634         yield self.serverfactory.stop()
 635         for singleclientconnector in self.singleclientconnectors:
 636             yield singleclientconnector.factory.stopTrying()
 637             yield singleclientconnector.disconnect()
 638         del self.singleclientconnectors
 639
 640     def got_conn(self, conn):
 641         if conn.nonce in self.peers:
 642             raise ValueError('already have peer')
 643         self.peers[conn.nonce] = conn
 644
 645         print '%s connection to peer %s:%i established. p2pool version: %i %r' % ('Incoming' if conn.incoming else 'Outgoing', conn.addr[0], conn.addr[1], conn.other_version, conn.other_sub_version)
 646
 647     def lost_conn(self, conn, reason):
 648         if conn.nonce not in self.peers:
 649             raise ValueError('''don't have peer''')
 650         if conn is not self.peers[conn.nonce]:
 651             raise ValueError('wrong conn')
 652         del self.peers[conn.nonce]
 653
 654         print 'Lost peer %s:%i - %s' % (conn.addr[0], conn.addr[1], reason.getErrorMessage())
 655
 656
 657     def got_addr(self, (host, port), services, timestamp):
 658         if (host, port) in self.addr_store:
 659             old_services, old_first_seen, old_last_seen = self.addr_store[host, port]
 660             self.addr_store[host, port] = services, old_first_seen, max(old_last_seen, timestamp)
 661         else:
 662             if len(self.addr_store) < 10000:
 663                 self.addr_store[host, port] = services, timestamp, timestamp
 664
 665     def handle_shares(self, shares, peer):
 666         print 'handle_shares', (shares, peer)
 667
 668     def handle_share_hashes(self, hashes, peer):
 669         print 'handle_share_hashes', (hashes, peer)
 670
 671     def handle_get_shares(self, hashes, parents, stops, peer):
 672         print 'handle_get_shares', (hashes, parents, stops, peer)
 673
 674     def handle_bestblock(self, header, peer):
 675         print 'handle_bestblock', header
 676
 677     def get_good_peers(self, max_count):
 678         t = time.time()
 679         return [x[0] for x in sorted(self.addr_store.iteritems(), key=lambda (k, (services, first_seen, last_seen)):
 680             -math.log(max(3600, last_seen - first_seen))/math.log(max(3600, t - last_seen))*random.expovariate(1)
 681         )][:max_count]