def listen_to_the_team(self):
# {{{ Create "team_socket" (UDP) as a copy of "splitter_socket" (TCP)
# Create a special socket to force source port increment on SYMSP NATs
self.team_socket = symsp_socket(self.PORT_STEP, socket.AF_INET, socket.SOCK_DGRAM)
try:
# In Windows systems this call doesn't work!
self.team_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
except Exception as e:
print("NTS:", e)
self.team_socket.bind(("", self.splitter_socket.getsockname()[PORT]))
# This is the maximum time the peer will wait for a chunk
# (from the splitter or from another peer).
self.team_socket.settimeout(1)
def try_to_disconnect_from_the_splitter(self):
# {{{
self.start_send_hello_thread()
# Receive the generated ID for this peer from splitter
self.receive_id()
# Note: This peer is *not* the monitor peer.
# Send UDP packets to splitter and monitor peers
# to create working NAT entries and to determine the
# source port allocation type of the NAT of this peer
for peer in self.peer_list[: self.number_of_monitors]:
self.say_hello(peer)
self.say_hello(self.splitter)
# Directly start packet sending
self.hello_messages_event.set()
# A list of peer_ids that contains the peers that were in the team when
# starting incorporation and that are not connected yet
self.initial_peer_list = []
# Receive the list of peers, except the monitor peer, with their peer
# IDs and send hello messages
self.receive_the_list_of_peers_2()
# Wait for getting connected to all currently known peers
incorporation_time = time.time()
# A timeout < MAX_PEER_ARRIVING_TIME has to be set for self.team_socket
# The monitor is not in initial_peer_list
while len(self.initial_peer_list) > 0:
if time.time() - incorporation_time > common.MAX_PEER_ARRIVING_TIME:
# Retry incorporation into the team
print(
"NTS: Retrying incorporation with %d peers left: %s"
% (len(self.initial_peer_list), self.initial_peer_list)
)
incorporation_time = time.time()
# Cleaning hello messages
with self.hello_messages_lock:
self.hello_messages_times.clear()
self.hello_messages_ports.clear()
del self.hello_messages[:]
# Resetting peer lists
del self.initial_peer_list[:]
del self.peer_list[self.number_of_monitors :] # Leave monitors
# Recreate the socket
# Similar to Peer_DBS.listen_to_the_team, binds to a random port
self.team_socket.close()
if Symsp_Peer.PORT_STEP:
self.team_socket = symsp_socket(Symsp_Peer.PORT_STEP, socket.AF_INET, socket.SOCK_DGRAM)
else:
self.team_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
try:
self.team_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
except Exception as e:
print("NTS:", e)
self.team_socket.bind(("", 0))
self.team_socket.settimeout(1)
# Say hello to splitter again, to retry incorporation
# 'N' for 'not incorporated'
self.send_message((self.peer_id + "N", self.splitter))
# Say hello to monitors again, to keep the NAT entry alive
for peer in self.peer_list[: self.number_of_monitors]:
self.send_message((self.peer_id + "N", peer))
# Receive all peer endpoints and send hello messages
self.receive_the_list_of_peers_2()
# Process messages to establish connections to peers
try:
message, sender = self.team_socket.recvfrom(struct.calcsize(self.message_format))
self.process_message(message, sender)
except socket.timeout:
pass
# Close the TCP socket
Peer_DBS.disconnect_from_the_splitter(self)
# The peer is now successfully incorporated; inform the splitter
self.send_message((self.peer_id + "Y", self.splitter))