p2pool/p2p.py

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