def __ping_peers(self):
"""
Ping all peers
Sends 'ping' sys message to all peers, checking for 'pong' response
"""
# create ping message instance
message = Message('', 'SYSTEM', msg_body='ping')
# save time of ping
ping_time = math.floor(time.time())
# ping each connected client
for connection in self.connections:
# send ping message
connection.send(message.get_encoded())
# wait ping timeout seconds
time.sleep(1)
# check which peers pong'ed back
dead_peers = []
for peer_id, peer_data in self.peer.get_chat_peers().items():
# get the last successful ping time of loop peer
last_successful_ping = peer_data['last_successful_ping']
# if the last successful ping response was earlier than this ping started
if last_successful_ping < ping_time:
# they didn't pong back, so they're inactive
dead_peers.append(peer_id)
# for each inactive peer
for peer_id in dead_peers:
# remove them from the chat peers list
self.peer.remove_chat_peer(peer_id)
# broadcast disconnect message (including remaining chat members)
msg_body = 'output:' + (
Style.error('- ' + peer_data['username'] + ' disconnected') +
Style.info(' [Chat Members: ' + self.peer.get_chat_peers_str() + ']')
)
disconnect_msg = Message('', 'SYSTEM', msg_body)
for connection in self.connections:
# send disconnect message to each connected client
connection.send(disconnect_msg.get_encoded())
# send the remaining peers list to each client
self.__send_peers()
if existing_ip and existing_port:
# existing member address given, so attempt to connect to their server
print('Connecting to existing members server...')
try:
client = Client(peer, existing_ip, existing_port)
peer.connected = True
except ConnectionRefusedError:
# failed to connect to existing member, so try become coordinator of own Server
print(Style.warning('Failed to connect to existing member! \n'))
else:
try:
client = Client(peer, listen_ip, listen_port)
peer.connected = True
except ConnectionRefusedError:
print(Style.error('Failed to connect to own server!'))
try:
while True:
if not peer.connected:
peer.connected = True
print(Style.error('Coordinator disconnected, finding new coordinator...'))
chat_peers = peer.get_chat_peers()
earliest_join_id = None
for peer_id, peer_data in chat_peers.items():
# loop peer isn't the old chat coordinator
if not peer_data['is_coord']:
if not earliest_join_id:
earliest_join_id = peer_id