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