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# The contents of this file are subject to the BitTorrent Open Source License
# Version 1.1 (the License). You may not copy or use this file, in either
# source code or executable form, except in compliance with the License. You
# may obtain a copy of the License at http://www.bittorrent.com/license/.
#
# Software distributed under the License is distributed on an AS IS basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
# Written by Bram Cohen
from socket import error as socketerror
from BitTorrent import BTFailure
from BitTorrent.RawServer_magic import Handler
from BitTorrent.NatTraversal import UPNPError
from BitTorrent.Connecter import Connection
from BitTorrent.platform import is_frozen_exe
from BitTorrent.ClientIdentifier import identify_client
# header, reserved, download id, my id, [length, message]
class InitialConnectionHandler(Handler):
def __init__(self, parent, id):
self.parent = parent
self.id = id
self.accept = True
def connection_started(self, s):
del self.parent.pending_connections[(s.ip, s.port)]
# prevents conenctions we no longer care about from being accepted
if not self.accept:
return
con = Connection(self.parent, s, self.id, True)
self.parent.connections[s] = con
# it might not be obvious why this is here.
# if the pending queue filled and put the remaining connections
# into the spare list, this will push more connections in to pending
self.parent.replace_connection()
def connection_failed(self, addr, exception):
del self.parent.pending_connections[addr]
if not self.accept:
# we don't need to rotate the spares with replace_connection()
# if the Encoder object has stopped all connections
return
self.parent.replace_connection()
class Encoder(object):
def __init__(self, make_upload, downloader, choker, numpieces, ratelimiter,
rawserver, config, my_id, schedulefunc, download_id, context, addcontactfunc, reported_port):
self.make_upload = make_upload
self.downloader = downloader
self.choker = choker
self.numpieces = numpieces
self.ratelimiter = ratelimiter
self.rawserver = rawserver
self.my_id = my_id
self.config = config
self.schedulefunc = schedulefunc
self.download_id = download_id
self.context = context
self.addcontact = addcontactfunc
self.reported_port = reported_port
self.everinc = False
# submitted
self.pending_connections = {}
# transport connected
self.connections = {}
# protocol active
self.complete_connections = {}
self.spares = {}
self.banned = {}
schedulefunc(self.send_keepalives, config['keepalive_interval'])
def send_keepalives(self):
self.schedulefunc(self.send_keepalives,
self.config['keepalive_interval'])
for c in self.complete_connections:
c.send_keepalive()
# returns False if the connection has been pushed on to self.spares
# other filters and a successful connection return True
def start_connection(self, dns, id):
if dns[0] in self.banned:
return True
if id == self.my_id:
return True
for v in self.connections.values():
if id and v.id == id:
return True
if self.config['one_connection_per_ip'] and v.ip == dns[0]:
return True
#print "start", len(self.pending_connections), len(self.spares), len(self.connections)
total_outstanding = len(self.connections)
# it's possible the pending connections could eventually complete,
# so we have to account for those when enforcing max_initiate
total_outstanding += len(self.pending_connections)
if total_outstanding >= self.config['max_initiate']:
self.spares[dns] = 1
return False
# if these fail, I'm getting a very weird dns object
assert isinstance(dns, tuple)
assert isinstance(dns[0], str)
assert isinstance(dns[1], int)
# looks like we connect to the same peer several times in a row.
# we should probably stop doing that, but this prevents it from crashing
if dns in self.pending_connections:
# uncomment this if you want to debug the multi-connect problem
#print "Double Add on", dns
#traceback.print_stack()
return True
handler = InitialConnectionHandler(self, id)
self.pending_connections[dns] = handler
started = self.rawserver.async_start_connection(dns, handler, self.context)
if not started:
del self.pending_connections[dns]
self.spares[dns] = 1
return False
return True
def connection_completed(self, c):
self.complete_connections[c] = 1
c.upload = self.make_upload(c)
c.download = self.downloader.make_download(c)
self.choker.connection_made(c)
if c.uses_dht:
c.send_port(self.reported_port)
def got_port(self, c):
if self.addcontact and c.uses_dht and c.dht_port != None:
self.addcontact(c.connection.ip, c.dht_port)
def ever_got_incoming(self):
return self.everinc
def how_many_connections(self):
return len(self.complete_connections)
def replace_connection(self):
while self.spares:
started = self.start_connection(self.spares.popitem()[0], None)
if not started:
# start_connection decided to push this connection back on to
# self.spares because a limit was hit. break now or loop forever
break
def close_connections(self):
# drop connections which could be made after we're not interested
for c in self.pending_connections.itervalues():
c.accept = False
for c in self.connections.itervalues():
if not c.closed:
c.connection.close()
c.closed = True
def singleport_connection(self, listener, con):
if con.ip in self.banned:
return
m = self.config['max_allow_in']
if m and len(self.connections) >= m:
return
self.connections[con.connection] = con
del listener.connections[con.connection]
con.encoder = self
con.connection.context = self.context
def ban(self, ip):
self.banned[ip] = None
class SingleportListener(Handler):
def __init__(self, rawserver, nattraverser):
self.rawserver = rawserver
self.nattraverser = nattraverser
self.port = 0
self.ports = {}
self.port_change_notification = None
self.torrents = {}
self.connections = {}
self.download_id = None
def _close(self, port):
serversocket = self.ports[port][0]
self.nattraverser.unregister_port(port, "TCP")
self.rawserver.stop_listening(serversocket)
serversocket.close()
def _check_close(self, port):
if not port or self.port == port or len(self.ports[port][1]) > 0:
return
self._close(port)
del self.ports[port]
def open_port(self, port, config):
if port in self.ports:
self.port = port
return
serversocket = self.rawserver.create_serversocket(
port, config['bind'], reuse=True, tos=config['peer_socket_tos'])
try:
d = self.nattraverser.register_port(port, port, "TCP", config['bind'])
d.addCallback(self._change_port)
except Exception, e:
# blanket, just incase - we don't want to interrupt things
# maybe we should log it, maybe not
#print "UPnP registration error", e
pass
self.rawserver.start_listening(serversocket, self)
oldport = self.port
self.port = port
self.ports[port] = [serversocket, {}]
self._check_close(oldport)
def _change_port(self, port):
if self.port == port:
return
[serversocket, callbacks] = self.ports[self.port]
self.ports[port] = [serversocket, callbacks]
del self.ports[self.port]
self.port = port
for callback in callbacks:
if callback:
callback(port)
def get_port(self, callback = None):
if self.port:
callbacks = self.ports[self.port][1]
if not callbacks.has_key(callback):
callbacks[callback] = 1
else:
callbacks[callback] += 1
return self.port
def release_port(self, port, callback = None):
callbacks = self.ports[port][1]
callbacks[callback] -= 1
if callbacks[callback] == 0:
del callbacks[callback]
self._check_close(port)
def close_sockets(self):
for port in self.ports.iterkeys():
self._close(port)
def add_torrent(self, infohash, encoder):
if infohash in self.torrents:
raise BTFailure(_("Can't start two separate instances of the same "
"torrent"))
self.torrents[infohash] = encoder
def remove_torrent(self, infohash):
del self.torrents[infohash]
def select_torrent(self, conn, infohash):
if infohash in self.torrents:
self.torrents[infohash].singleport_connection(self, conn)
def connection_made(self, connection):
con = Connection(self, connection, None, False)
self.connections[connection] = con
def replace_connection(self):
pass
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