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