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     max_remembered_txs_size = 2500000
  29
  30     def __init__(self, node, incoming):
  31         p2protocol.Protocol.__init__(self, node.net.PREFIX, 1000000, node.traffic_happened)
  32         self.node = node
  33         self.incoming = incoming
  34
  35         self.other_version = None
  36         self.connected2 = False
  37
  38     def connectionMade(self):
  39         self.factory.proto_made_connection(self)
  40
  41         self.connection_lost_event = variable.Event()
  42
  43         self.addr = self.transport.getPeer().host, self.transport.getPeer().port
  44
  45         self.send_version(
  46             version=1100,
  47             services=0,
  48             addr_to=dict(
  49                 services=0,
  50                 address=self.transport.getPeer().host,
  51                 port=self.transport.getPeer().port,
  52             ),
  53             addr_from=dict(
  54                 services=0,
  55                 address=self.transport.getHost().host,
  56                 port=self.transport.getHost().port,
  57             ),
  58             nonce=self.node.nonce,
  59             sub_version=p2pool.__version__,
  60             mode=1,
  61             best_share_hash=self.node.best_share_hash_func(),
  62         )
  63
  64         self.timeout_delayed = reactor.callLater(10, self._connect_timeout)
  65
  66         self.get_shares = deferral.GenericDeferrer(
  67             max_id=2**256,
  68             func=lambda id, hashes, parents, stops: self.send_sharereq(id=id, hashes=hashes, parents=parents, stops=stops),
  69             timeout=15,
  70             on_timeout=self.transport.loseConnection,
  71         )
  72
  73         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
  74         self.remote_remembered_txs_size = 0
  75
  76         self.remembered_txs = {} # view of peer's mining_txs
  77         self.remembered_txs_size = 0
  78         self.known_txs_cache = {}
  79
  80     def _connect_timeout(self):
  81         self.timeout_delayed = None
  82         print 'Handshake timed out, disconnecting from %s:%i' % self.addr
  83         if self.transport.abortConnection is not None:
  84             # Available since Twisted 11.1
  85             self.transport.abortConnection()
  86         else:
  87             # This doesn't always close timed out connections!
  88             self.transport.loseConnection()
  89
  90     def packetReceived(self, command, payload2):
  91         try:
  92             if command != 'version' and not self.connected2:
  93                 raise PeerMisbehavingError('first message was not version message')
  94             p2protocol.Protocol.packetReceived(self, command, payload2)
  95         except PeerMisbehavingError, e:
  96             print 'Peer %s:%i misbehaving, will drop and ban. Reason:' % self.addr, e.message
  97             self.badPeerHappened()
  98
  99     def badPeerHappened(self):
 100         if p2pool.DEBUG:
 101             print "Bad peer banned:", self.addr
 102         self.transport.loseConnection()
 103         if self.transport.getPeer().host != '127.0.0.1': # never ban localhost
 104             self.node.bans[self.transport.getPeer().host] = time.time() + 60*60
 105
 106     def _timeout(self):
 107         self.timeout_delayed = None
 108         print 'Connection timed out, disconnecting from %s:%i' % self.addr
 109         if self.transport.abortConnection is not None:
 110             # Available since Twisted 11.1
 111             self.transport.abortConnection()
 112         else:
 113             # This doesn't always close timed out connections!
 114             self.transport.loseConnection()
 115
 116     message_version = pack.ComposedType([
 117         ('version', pack.IntType(32)),
 118         ('services', pack.IntType(64)),
 119         ('addr_to', bitcoin_data.address_type),
 120         ('addr_from', bitcoin_data.address_type),
 121         ('nonce', pack.IntType(64)),
 122         ('sub_version', pack.VarStrType()),
 123         ('mode', pack.IntType(32)), # always 1 for legacy compatibility
 124         ('best_share_hash', pack.PossiblyNoneType(0, pack.IntType(256))),
 125     ])
 126     def handle_version(self, version, services, addr_to, addr_from, nonce, sub_version, mode, best_share_hash):
 127         if self.other_version is not None:
 128             raise PeerMisbehavingError('more than one version message')
 129         if version < 8:
 130             raise PeerMisbehavingError('peer too old')
 131
 132         self.other_version = version
 133         self.other_sub_version = sub_version[:512]
 134         self.other_services = services
 135
 136         if nonce == self.node.nonce:
 137             raise PeerMisbehavingError('was connected to self')
 138         if nonce in self.node.peers:
 139             if p2pool.DEBUG:
 140                 print 'Detected duplicate connection, disconnecting from %s:%i' % self.addr
 141             self.transport.loseConnection()
 142             return
 143
 144         self.nonce = nonce
 145         self.connected2 = True
 146
 147         self.timeout_delayed.cancel()
 148         self.timeout_delayed = reactor.callLater(100, self._timeout)
 149
 150         old_dataReceived = self.dataReceived
 151         def new_dataReceived(data):
 152             if self.timeout_delayed is not None:
 153                 self.timeout_delayed.reset(100)
 154             old_dataReceived(data)
 155         self.dataReceived = new_dataReceived
 156
 157         self.factory.proto_connected(self)
 158
 159         self._stop_thread = deferral.run_repeatedly(lambda: [
 160             self.send_ping(),
 161         random.expovariate(1/100)][-1])
 162
 163         self._stop_thread2 = deferral.run_repeatedly(lambda: [
 164             self.send_addrme(port=self.node.serverfactory.listen_port.getHost().port) if self.node.serverfactory.listen_port is not None else None,
 165         random.expovariate(1/(100*len(self.node.peers) + 1))][-1])
 166
 167         if best_share_hash is not None:
 168             self.node.handle_share_hashes([best_share_hash], self)
 169
 170         if self.other_version < 8:
 171             return
 172
 173         def update_remote_view_of_my_known_txs(before, after):
 174             added = set(after) - set(before)
 175             removed = set(before) - set(after)
 176             if added:
 177                 self.send_have_tx(tx_hashes=list(added))
 178             if removed:
 179                 self.send_losing_tx(tx_hashes=list(removed))
 180
 181                 # cache forgotten txs here for a little while so latency of "losing_tx" packets doesn't cause problems
 182                 key = max(self.known_txs_cache) + 1 if self.known_txs_cache else 0
 183                 self.known_txs_cache[key] = dict((h, before[h]) for h in removed)
 184                 reactor.callLater(20, self.known_txs_cache.pop, key)
 185         watch_id = self.node.known_txs_var.transitioned.watch(update_remote_view_of_my_known_txs)
 186         self.connection_lost_event.watch(lambda: self.node.known_txs_var.transitioned.unwatch(watch_id))
 187
 188         self.send_have_tx(tx_hashes=self.node.known_txs_var.value.keys())
 189
 190         def update_remote_view_of_my_mining_txs(before, after):
 191             added = set(after) - set(before)
 192             removed = set(before) - set(after)
 193             if added:
 194                 self.remote_remembered_txs_size += sum(100 + bitcoin_data.tx_type.packed_size(after[x]) for x in added)
 195                 assert self.remote_remembered_txs_size <= self.max_remembered_txs_size
 196                 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])
 197             if removed:
 198                 self.send_forget_tx(tx_hashes=list(removed))
 199                 self.remote_remembered_txs_size -= sum(100 + bitcoin_data.tx_type.packed_size(before[x]) for x in removed)
 200         watch_id2 = self.node.mining_txs_var.transitioned.watch(update_remote_view_of_my_mining_txs)
 201         self.connection_lost_event.watch(lambda: self.node.mining_txs_var.transitioned.unwatch(watch_id2))
 202
 203         self.remote_remembered_txs_size += sum(100 + bitcoin_data.tx_type.packed_size(x) for x in self.node.mining_txs_var.value.values())
 204         assert self.remote_remembered_txs_size <= self.max_remembered_txs_size
 205         fragment(self.send_remember_tx, tx_hashes=[], txs=self.node.mining_txs_var.value.values())
 206
 207     message_ping = pack.ComposedType([])
 208     def handle_ping(self):
 209         pass
 210
 211     message_addrme = pack.ComposedType([
 212         ('port', pack.IntType(16)),
 213     ])
 214     def handle_addrme(self, port):
 215         host = self.transport.getPeer().host
 216         #print 'addrme from', host, port
 217         if host == '127.0.0.1':
 218             if random.random() < .8 and self.node.peers:
 219                 random.choice(self.node.peers.values()).send_addrme(port=port) # services...
 220         else:
 221             self.node.got_addr((self.transport.getPeer().host, port), self.other_services, int(time.time()))
 222             if random.random() < .8 and self.node.peers:
 223                 random.choice(self.node.peers.values()).send_addrs(addrs=[
 224                     dict(
 225                         address=dict(
 226                             services=self.other_services,
 227                             address=host,
 228                             port=port,
 229                         ),
 230                         timestamp=int(time.time()),
 231                     ),
 232                 ])
 233
 234     message_addrs = pack.ComposedType([
 235         ('addrs', pack.ListType(pack.ComposedType([
 236             ('timestamp', pack.IntType(64)),
 237             ('address', bitcoin_data.address_type),
 238         ]))),
 239     ])
 240     def handle_addrs(self, addrs):
 241         for addr_record in addrs:
 242             self.node.got_addr((addr_record['address']['address'], addr_record['address']['port']), addr_record['address']['services'], min(int(time.time()), addr_record['timestamp']))
 243             if random.random() < .8 and self.node.peers:
 244                 random.choice(self.node.peers.values()).send_addrs(addrs=[addr_record])
 245
 246     message_getaddrs = pack.ComposedType([
 247         ('count', pack.IntType(32)),
 248     ])
 249     def handle_getaddrs(self, count):
 250         if count > 100:
 251             count = 100
 252         self.send_addrs(addrs=[
 253             dict(
 254                 timestamp=int(self.node.addr_store[host, port][2]),
 255                 address=dict(
 256                     services=self.node.addr_store[host, port][0],
 257                     address=host,
 258                     port=port,
 259                 ),
 260             ) for host, port in
 261             self.node.get_good_peers(count)
 262         ])
 263
 264     message_shares = pack.ComposedType([
 265         ('shares', pack.ListType(p2pool_data.share_type)),
 266     ])
 267     def handle_shares(self, shares):
 268         self.node.handle_shares([p2pool_data.load_share(share, self.node.net, self.addr) for share in shares if share['type'] >= 9], self)
 269
 270     def sendShares(self, shares, tracker, known_txs, include_txs_with=[]):
 271         if self.other_version >= 8:
 272             tx_hashes = set()
 273             for share in shares:
 274                 if share.hash in include_txs_with:
 275                     x = share.get_other_tx_hashes(tracker)
 276                     if x is not None:
 277                         tx_hashes.update(x)
 278
 279             hashes_to_send = [x for x in tx_hashes if x not in self.node.mining_txs_var.value and x in known_txs]
 280
 281             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)
 282             if new_remote_remembered_txs_size > self.max_remembered_txs_size:
 283                 raise ValueError('shares have too many txs')
 284             self.remote_remembered_txs_size = new_remote_remembered_txs_size
 285
 286             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])
 287
 288         fragment(self.send_shares, shares=[share.as_share() for share in shares])
 289
 290         if self.other_version >= 8:
 291             self.send_forget_tx(tx_hashes=hashes_to_send)
 292
 293             self.remote_remembered_txs_size -= sum(100 + bitcoin_data.tx_type.packed_size(known_txs[x]) for x in hashes_to_send)
 294
 295
 296     message_sharereq = pack.ComposedType([
 297         ('id', pack.IntType(256)),
 298         ('hashes', pack.ListType(pack.IntType(256))),
 299         ('parents', pack.VarIntType()),
 300         ('stops', pack.ListType(pack.IntType(256))),
 301     ])
 302     def handle_sharereq(self, id, hashes, parents, stops):
 303         shares = self.node.handle_get_shares(hashes, parents, stops, self)
 304         try:
 305             self.send_sharereply(id=id, result='good', shares=[share.as_share() for share in shares])
 306         except p2protocol.TooLong:
 307             self.send_sharereply(id=id, result='too long', shares=[])
 308
 309     message_sharereply = pack.ComposedType([
 310         ('id', pack.IntType(256)),
 311         ('result', pack.EnumType(pack.VarIntType(), {0: 'good', 1: 'too long', 2: 'unk2', 3: 'unk3', 4: 'unk4', 5: 'unk5', 6: 'unk6'})),
 312         ('shares', pack.ListType(p2pool_data.share_type)),
 313     ])
 314     def handle_sharereply(self, id, result, shares):
 315         if result == 'good':
 316             res = [p2pool_data.load_share(share, self.node.net, self.addr) for share in shares if share['type'] >= 9]
 317         else:
 318             res = failure.Failure("sharereply result: " + result)
 319         self.get_shares.got_response(id, res)
 320
 321
 322     message_bestblock = pack.ComposedType([
 323         ('header', bitcoin_data.block_header_type),
 324     ])
 325     def handle_bestblock(self, header):
 326         self.node.handle_bestblock(header, self)
 327
 328
 329     message_have_tx = pack.ComposedType([
 330         ('tx_hashes', pack.ListType(pack.IntType(256))),
 331     ])
 332     def handle_have_tx(self, tx_hashes):
 333         #assert self.remote_tx_hashes.isdisjoint(tx_hashes)
 334         self.remote_tx_hashes.update(tx_hashes)
 335         while len(self.remote_tx_hashes) > 10000:
 336             self.remote_tx_hashes.pop()
 337     message_losing_tx = pack.ComposedType([
 338         ('tx_hashes', pack.ListType(pack.IntType(256))),
 339     ])
 340     def handle_losing_tx(self, tx_hashes):
 341         #assert self.remote_tx_hashes.issuperset(tx_hashes)
 342         self.remote_tx_hashes.difference_update(tx_hashes)
 343
 344
 345     message_remember_tx = pack.ComposedType([
 346         ('tx_hashes', pack.ListType(pack.IntType(256))),
 347         ('txs', pack.ListType(bitcoin_data.tx_type)),
 348     ])
 349     def handle_remember_tx(self, tx_hashes, txs):
 350         for tx_hash in tx_hashes:
 351             if tx_hash in self.remembered_txs:
 352                 print >>sys.stderr, 'Peer referenced transaction twice, disconnecting'
 353                 self.transport.loseConnection()
 354                 return
 355
 356             if tx_hash in self.node.known_txs_var.value:
 357                 tx = self.node.known_txs_var.value[tx_hash]
 358             else:
 359                 for cache in self.known_txs_cache.itervalues():
 360                     if tx_hash in cache:
 361                         tx = cache[tx_hash]
 362                         print 'Transaction %064x rescued from peer latency cache!' % (tx_hash,)
 363                         break
 364                 else:
 365                     print >>sys.stderr, 'Peer referenced unknown transaction %064x, disconnecting' % (tx_hash,)
 366                     self.transport.loseConnection()
 367                     return
 368
 369             self.remembered_txs[tx_hash] = tx
 370             self.remembered_txs_size += 100 + bitcoin_data.tx_type.packed_size(tx)
 371         new_known_txs = dict(self.node.known_txs_var.value)
 372         warned = False
 373         for tx in txs:
 374             tx_hash = bitcoin_data.hash256(bitcoin_data.tx_type.pack(tx))
 375             if tx_hash in self.remembered_txs:
 376                 print >>sys.stderr, 'Peer referenced transaction twice, disconnecting'
 377                 self.transport.loseConnection()
 378                 return
 379
 380             if tx_hash in self.node.known_txs_var.value and not warned:
 381                 print 'Peer sent entire transaction %064x that was already received' % (tx_hash,)
 382                 warned = True
 383
 384             self.remembered_txs[tx_hash] = tx
 385             self.remembered_txs_size += 100 + bitcoin_data.tx_type.packed_size(tx)
 386             new_known_txs[tx_hash] = tx
 387         self.node.known_txs_var.set(new_known_txs)
 388         if self.remembered_txs_size >= self.max_remembered_txs_size:
 389             raise PeerMisbehavingError('too much transaction data stored')
 390     message_forget_tx = pack.ComposedType([
 391         ('tx_hashes', pack.ListType(pack.IntType(256))),
 392     ])
 393     def handle_forget_tx(self, tx_hashes):
 394         for tx_hash in tx_hashes:
 395             self.remembered_txs_size -= 100 + bitcoin_data.tx_type.packed_size(self.remembered_txs[tx_hash])
 396             assert self.remembered_txs_size >= 0
 397             del self.remembered_txs[tx_hash]
 398
 399
 400     def connectionLost(self, reason):
 401         self.connection_lost_event.happened()
 402         if self.timeout_delayed is not None:
 403             self.timeout_delayed.cancel()
 404         if self.connected2:
 405             self.factory.proto_disconnected(self, reason)
 406             self._stop_thread()
 407             self._stop_thread2()
 408             self.connected2 = False
 409         self.factory.proto_lost_connection(self, reason)
 410         if p2pool.DEBUG:
 411             print "Peer connection lost:", self.addr, reason
 412         self.get_shares.respond_all(reason)
 413
 414     @defer.inlineCallbacks
 415     def do_ping(self):
 416         start = reactor.seconds()
 417         yield self.get_shares(hashes=[0], parents=0, stops=[])
 418         end = reactor.seconds()
 419         defer.returnValue(end - start)
 420
 421 class ServerFactory(protocol.ServerFactory):
 422     def __init__(self, node, max_conns):
 423         self.node = node
 424         self.max_conns = max_conns
 425
 426         self.conns = {}
 427         self.running = False
 428         self.listen_port = None
 429
 430     def buildProtocol(self, addr):
 431         if sum(self.conns.itervalues()) >= self.max_conns or self.conns.get(self._host_to_ident(addr.host), 0) >= 3:
 432             return None
 433         if addr.host in self.node.bans and self.node.bans[addr.host] > time.time():
 434             return None
 435         p = Protocol(self.node, True)
 436         p.factory = self
 437         if p2pool.DEBUG:
 438             print "Got peer connection from:", addr
 439         return p
 440
 441     def _host_to_ident(self, host):
 442         a, b, c, d = host.split('.')
 443         return a, b
 444
 445     def proto_made_connection(self, proto):
 446         ident = self._host_to_ident(proto.transport.getPeer().host)
 447         self.conns[ident] = self.conns.get(ident, 0) + 1
 448     def proto_lost_connection(self, proto, reason):
 449         ident = self._host_to_ident(proto.transport.getPeer().host)
 450         self.conns[ident] -= 1
 451         if not self.conns[ident]:
 452             del self.conns[ident]
 453
 454     def proto_connected(self, proto):
 455         self.node.got_conn(proto)
 456     def proto_disconnected(self, proto, reason):
 457         self.node.lost_conn(proto, reason)
 458
 459     def start(self):
 460         assert not self.running
 461         self.running = True
 462
 463         def attempt_listen():
 464             if self.running:
 465                 self.listen_port = reactor.listenTCP(self.node.port, self)
 466         deferral.retry('Error binding to P2P port:', traceback=False)(attempt_listen)()
 467
 468     def stop(self):
 469         assert self.running
 470         self.running = False
 471
 472         return self.listen_port.stopListening()
 473
 474 class ClientFactory(protocol.ClientFactory):
 475     def __init__(self, node, desired_conns, max_attempts):
 476         self.node = node
 477         self.desired_conns = desired_conns
 478         self.max_attempts = max_attempts
 479
 480         self.attempts = set()
 481         self.conns = set()
 482         self.running = False
 483
 484     def _host_to_ident(self, host):
 485         a, b, c, d = host.split('.')
 486         return a, b
 487
 488     def buildProtocol(self, addr):
 489         p = Protocol(self.node, False)
 490         p.factory = self
 491         return p
 492
 493     def startedConnecting(self, connector):
 494         ident = self._host_to_ident(connector.getDestination().host)
 495         if ident in self.attempts:
 496             raise AssertionError('already have attempt')
 497         self.attempts.add(ident)
 498
 499     def clientConnectionFailed(self, connector, reason):
 500         self.attempts.remove(self._host_to_ident(connector.getDestination().host))
 501
 502     def clientConnectionLost(self, connector, reason):
 503         self.attempts.remove(self._host_to_ident(connector.getDestination().host))
 504
 505     def proto_made_connection(self, proto):
 506         pass
 507     def proto_lost_connection(self, proto, reason):
 508         pass
 509
 510     def proto_connected(self, proto):
 511         self.conns.add(proto)
 512         self.node.got_conn(proto)
 513     def proto_disconnected(self, proto, reason):
 514         self.conns.remove(proto)
 515         self.node.lost_conn(proto, reason)
 516
 517     def start(self):
 518         assert not self.running
 519         self.running = True
 520         self._stop_thinking = deferral.run_repeatedly(self._think)
 521     def stop(self):
 522         assert self.running
 523         self.running = False
 524         self._stop_thinking()
 525
 526     def _think(self):
 527         try:
 528             if len(self.conns) < self.desired_conns and len(self.attempts) < self.max_attempts and self.node.addr_store:
 529                 (host, port), = self.node.get_good_peers(1)
 530
 531                 if self._host_to_ident(host) in self.attempts:
 532                     pass
 533                 elif host in self.node.bans and self.node.bans[host] > time.time():
 534                     pass
 535                 else:
 536                     #print 'Trying to connect to', host, port
 537                     reactor.connectTCP(host, port, self, timeout=5)
 538         except:
 539             log.err()
 540
 541         return random.expovariate(1/1)
 542
 543 class SingleClientFactory(protocol.ReconnectingClientFactory):
 544     def __init__(self, node):
 545         self.node = node
 546
 547     def buildProtocol(self, addr):
 548         p = Protocol(self.node, incoming=False)
 549         p.factory = self
 550         return p
 551
 552     def proto_made_connection(self, proto):
 553         pass
 554     def proto_lost_connection(self, proto, reason):
 555         pass
 556
 557     def proto_connected(self, proto):
 558         self.resetDelay()
 559         self.node.got_conn(proto)
 560     def proto_disconnected(self, proto, reason):
 561         self.node.lost_conn(proto, reason)
 562
 563 class Node(object):
 564     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({})):
 565         self.best_share_hash_func = best_share_hash_func
 566         self.port = port
 567         self.net = net
 568         self.addr_store = dict(addr_store)
 569         self.connect_addrs = connect_addrs
 570         self.preferred_storage = preferred_storage
 571         self.known_txs_var = known_txs_var
 572         self.mining_txs_var = mining_txs_var
 573
 574         self.traffic_happened = variable.Event()
 575         self.nonce = random.randrange(2**64)
 576         self.peers = {}
 577         self.bans = {} # address -> end_time
 578         self.clientfactory = ClientFactory(self, desired_outgoing_conns, max_outgoing_attempts)
 579         self.serverfactory = ServerFactory(self, max_incoming_conns)
 580         self.running = False
 581
 582     def start(self):
 583         if self.running:
 584             raise ValueError('already running')
 585
 586         self.clientfactory.start()
 587         self.serverfactory.start()
 588         self.singleclientconnectors = [reactor.connectTCP(addr, port, SingleClientFactory(self)) for addr, port in self.connect_addrs]
 589
 590         self.running = True
 591
 592         self._stop_thinking = deferral.run_repeatedly(self._think)
 593
 594     def _think(self):
 595         try:
 596             if len(self.addr_store) < self.preferred_storage and self.peers:
 597                 random.choice(self.peers.values()).send_getaddrs(count=8)
 598         except:
 599             log.err()
 600
 601         return random.expovariate(1/20)
 602
 603     @defer.inlineCallbacks
 604     def stop(self):
 605         if not self.running:
 606             raise ValueError('already stopped')
 607
 608         self.running = False
 609
 610         self._stop_thinking()
 611         yield self.clientfactory.stop()
 612         yield self.serverfactory.stop()
 613         for singleclientconnector in self.singleclientconnectors:
 614             yield singleclientconnector.factory.stopTrying()
 615             yield singleclientconnector.disconnect()
 616         del self.singleclientconnectors
 617
 618     def got_conn(self, conn):
 619         if conn.nonce in self.peers:
 620             raise ValueError('already have peer')
 621         self.peers[conn.nonce] = conn
 622
 623         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)
 624
 625     def lost_conn(self, conn, reason):
 626         if conn.nonce not in self.peers:
 627             raise ValueError('''don't have peer''')
 628         if conn is not self.peers[conn.nonce]:
 629             raise ValueError('wrong conn')
 630         del self.peers[conn.nonce]
 631
 632         print 'Lost peer %s:%i - %s' % (conn.addr[0], conn.addr[1], reason.getErrorMessage())
 633
 634
 635     def got_addr(self, (host, port), services, timestamp):
 636         if (host, port) in self.addr_store:
 637             old_services, old_first_seen, old_last_seen = self.addr_store[host, port]
 638             self.addr_store[host, port] = services, old_first_seen, max(old_last_seen, timestamp)
 639         else:
 640             if len(self.addr_store) < 10000:
 641                 self.addr_store[host, port] = services, timestamp, timestamp
 642
 643     def handle_shares(self, shares, peer):
 644         print 'handle_shares', (shares, peer)
 645
 646     def handle_share_hashes(self, hashes, peer):
 647         print 'handle_share_hashes', (hashes, peer)
 648
 649     def handle_get_shares(self, hashes, parents, stops, peer):
 650         print 'handle_get_shares', (hashes, parents, stops, peer)
 651
 652     def handle_bestblock(self, header, peer):
 653         print 'handle_bestblock', header
 654
 655     def get_good_peers(self, max_count):
 656         t = time.time()
 657         return [x[0] for x in sorted(self.addr_store.iteritems(), key=lambda (k, (services, first_seen, last_seen)):
 658             -math.log(max(3600, last_seen - first_seen))/math.log(max(3600, t - last_seen))*random.expovariate(1)
 659         )][:max_count]