226 lines
9.5 KiB
Python
226 lines
9.5 KiB
Python
import random
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import logging
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from twisted.internet import defer, reactor
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from lbrynet import utils, conf
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from lbrynet.p2p.client.ClientProtocol import ClientProtocolFactory
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from lbrynet.p2p.Error import InsufficientFundsError
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log = logging.getLogger(__name__)
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class PeerConnectionHandler:
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def __init__(self, request_creators, factory):
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self.request_creators = request_creators
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self.factory = factory
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self.connection = None
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class ConnectionManager:
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#implements(interfaces.IConnectionManager)
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MANAGE_CALL_INTERVAL_SEC = 5
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TCP_CONNECT_TIMEOUT = 15
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def __init__(self, downloader, rate_limiter,
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primary_request_creators, secondary_request_creators):
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self.seek_head_blob_first = conf.settings['seek_head_blob_first']
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self.max_connections_per_stream = conf.settings['max_connections_per_stream']
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self.downloader = downloader
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self.rate_limiter = rate_limiter
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self._primary_request_creators = primary_request_creators
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self._secondary_request_creators = secondary_request_creators
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self._peer_connections = {} # {Peer: PeerConnectionHandler}
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self._connections_closing = {} # {Peer: deferred (fired when the connection is closed)}
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self._next_manage_call = None
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# a deferred that gets fired when a _manage call is set
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self._manage_deferred = None
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self.stopped = True
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log.debug("%s initialized", self._get_log_name())
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# this identifies what the connection manager is for,
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# used for logging purposes only
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def _get_log_name(self):
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out = 'Connection Manager Unknown'
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if hasattr(self.downloader, 'stream_name'):
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out = 'Connection Manager '+self.downloader.stream_name
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elif hasattr(self.downloader, 'blob_hash'):
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out = 'Connection Manager '+self.downloader.blob_hash
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return out
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def _start(self):
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self.stopped = False
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if self._next_manage_call is not None and self._next_manage_call.active() is True:
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self._next_manage_call.cancel()
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def start(self):
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log.debug("%s starting", self._get_log_name())
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self._start()
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self._next_manage_call = utils.call_later(0, self.manage)
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return defer.succeed(True)
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@defer.inlineCallbacks
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def stop(self):
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log.debug("%s stopping", self._get_log_name())
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self.stopped = True
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# wait for the current manage call to finish
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if self._manage_deferred:
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yield self._manage_deferred
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# in case we stopped between manage calls, cancel the next one
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if self._next_manage_call and self._next_manage_call.active():
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self._next_manage_call.cancel()
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self._next_manage_call = None
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yield self._close_peers()
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def num_peer_connections(self):
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return len(self._peer_connections)
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def _close_peers(self):
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def disconnect_peer(p):
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d = defer.Deferred()
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self._connections_closing[p] = d
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self._peer_connections[p].connection.disconnect()
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if p in self._peer_connections:
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del self._peer_connections[p]
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return d
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def close_connection(p):
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log.debug("%s Abruptly closing a connection to %s due to downloading being paused",
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self._get_log_name(), p)
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if self._peer_connections[p].factory.p is not None:
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d = self._peer_connections[p].factory.p.cancel_requests()
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else:
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d = defer.succeed(True)
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d.addBoth(lambda _: disconnect_peer(p))
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return d
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# fixme: stop modifying dict during iteration
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closing_deferreds = [close_connection(peer) for peer in list(self._peer_connections)]
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return defer.DeferredList(closing_deferreds)
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@defer.inlineCallbacks
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def get_next_request(self, peer, protocol):
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log.debug("%s Trying to get the next request for peer %s", self._get_log_name(), peer)
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if not peer in self._peer_connections or self.stopped is True:
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log.debug("%s The peer %s has already been told to shut down.",
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self._get_log_name(), peer)
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defer.returnValue(False)
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requests = yield self._send_primary_requests(peer, protocol)
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have_request = any(r[1] for r in requests if r[0] is True)
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if have_request:
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yield self._send_secondary_requests(peer, protocol)
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defer.returnValue(have_request)
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def _send_primary_requests(self, peer, protocol):
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def handle_error(err):
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err.trap(InsufficientFundsError)
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self.downloader.insufficient_funds(err)
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return False
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def check_if_request_sent(request_sent, request_creator):
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if peer not in self._peer_connections:
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# This can happen if the connection is told to close
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return False
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if request_sent is False:
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if request_creator in self._peer_connections[peer].request_creators:
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self._peer_connections[peer].request_creators.remove(request_creator)
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else:
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if not request_creator in self._peer_connections[peer].request_creators:
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self._peer_connections[peer].request_creators.append(request_creator)
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return request_sent
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ds = []
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for p_r_c in self._primary_request_creators:
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d = p_r_c.send_next_request(peer, protocol)
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d.addErrback(handle_error)
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d.addCallback(check_if_request_sent, p_r_c)
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ds.append(d)
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return defer.DeferredList(ds, fireOnOneErrback=True)
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def _send_secondary_requests(self, peer, protocol):
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ds = [
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s_r_c.send_next_request(peer, protocol)
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for s_r_c in self._secondary_request_creators
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]
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return defer.DeferredList(ds)
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@defer.inlineCallbacks
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def manage(self, schedule_next_call=True):
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self._manage_deferred = defer.Deferred()
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if len(self._peer_connections) < self.max_connections_per_stream:
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log.debug("%s have %d connections, looking for %d",
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self._get_log_name(), len(self._peer_connections),
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self.max_connections_per_stream)
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peers = yield self._get_new_peers()
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for peer in peers:
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self._connect_to_peer(peer)
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self._manage_deferred.callback(None)
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self._manage_deferred = None
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if not self.stopped and schedule_next_call:
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self._next_manage_call = utils.call_later(self.MANAGE_CALL_INTERVAL_SEC, self.manage)
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def return_shuffled_peers_not_connected_to(self, peers, new_conns_needed):
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out = [peer for peer in peers if peer not in self._peer_connections]
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random.shuffle(out)
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return out[0:new_conns_needed]
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@defer.inlineCallbacks
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def _get_new_peers(self):
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new_conns_needed = self.max_connections_per_stream - len(self._peer_connections)
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if new_conns_needed < 1:
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defer.returnValue([])
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# we always get the peer from the first request creator
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# must be a type BlobRequester...
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request_creator = self._primary_request_creators[0]
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log.debug("%s Trying to get a new peer to connect to", self._get_log_name())
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# find peers for the head blob if configured to do so
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if self.seek_head_blob_first:
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try:
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peers = yield request_creator.get_new_peers_for_head_blob()
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peers = self.return_shuffled_peers_not_connected_to(peers, new_conns_needed)
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except KeyError:
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log.warning("%s does not have a head blob", self._get_log_name())
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peers = []
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else:
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peers = []
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# we didn't find any new peers on the head blob,
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# we have to look for the first unavailable blob
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if not peers:
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peers = yield request_creator.get_new_peers_for_next_unavailable()
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peers = self.return_shuffled_peers_not_connected_to(peers, new_conns_needed)
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log.debug("%s Got a list of peers to choose from: %s",
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self._get_log_name(), peers)
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log.debug("%s Current connections: %s",
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self._get_log_name(), self._peer_connections.keys())
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log.debug("%s List of connection states: %s", self._get_log_name(),
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[p_c_h.connection.state for p_c_h in self._peer_connections.values()])
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defer.returnValue(peers)
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def _connect_to_peer(self, peer):
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if self.stopped:
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return
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log.debug("%s Trying to connect to %s", self._get_log_name(), peer)
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factory = ClientProtocolFactory(peer, self.rate_limiter, self)
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factory.connection_was_made_deferred.addCallback(
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lambda c_was_made: self._peer_disconnected(c_was_made, peer))
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self._peer_connections[peer] = PeerConnectionHandler(self._primary_request_creators[:],
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factory)
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connection = reactor.connectTCP(peer.host, peer.port, factory,
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timeout=self.TCP_CONNECT_TIMEOUT)
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self._peer_connections[peer].connection = connection
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def _peer_disconnected(self, connection_was_made, peer):
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log.debug("%s protocol disconnected for %s",
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self._get_log_name(), peer)
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if peer in self._peer_connections:
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del self._peer_connections[peer]
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if peer in self._connections_closing:
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d = self._connections_closing[peer]
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del self._connections_closing[peer]
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d.callback(True)
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return connection_was_made
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