def keepAlive():
server = config.master
while True:
try:
# Wait keepAlive period
time.sleep(config.timeout/5)
except:
break
# Simulate dying
#if (randint(0, 10) == 0):
# return
try:
# Connect to master and ask for status
print("{time:s} Send KeepAlive".format(time=Utilities.current_time_formatted()))
conn = messages.Connection(Utilities.connect((server["address"], server["port"])))
connections_manager.add(conn)
sendStatusMessage(conn)
for msg in pending_messages.getAll():
print("Sending result: {:s}".format(str(msg)))
conn.send(msg)
conn.socket.shutdown(socket.SHUT_WR)
# Read response
for msg in conn:
# TM, CN: Backup servers info
if type(msg) == messages.NoOperation:
messageNoOperation(msg)
# TM: Divide problem
elif type(msg) == messages.DivideProblem:
messageDivideProblem(msg)
# CN: Compute partial problems solutions
elif type(msg) == messages.SolvePartialProblems:
messageSolvePartialProblems(msg)
# TM: Merge partial solutions
elif type(msg) == messages.Solutions:
messageSolutions(msg)
else:
print("? {:s}".format(str(msg)))
conn.socket.close()
connections_manager.remove(conn)
except OSError as msg:
print("KeepAlive connection error: {:s}".format(str(msg)))
if config.backups:
index = config.backups.index(server) if server in config.backups else -1
server = config.backups[index + 1] if len(config.backups) > index + 1 else None
if server == None:
print("No further backup servers available, exiting...")
break
print("Backup list: ", config.backups)
print("Connecting to next backup: {:s}:{:d}".format(server["address"], server["port"]))
else:
break
def registerBackup(address, port, assumeId=None):
print("{time:s} Connecting to {address:s}:{port:d}...".format(time=Utilities.current_time_formatted(), address=address, port=port))
while True:
try:
conn = messages.Connection(connect((address, port), ('', args.port)))
connections_manager.add(conn)
break
except Exception as msg:
print("Trying to bind...")
time.sleep(1)
print("Send Register message")
request = messages.Register(Type="CommunicationServer", SolvableProblems=[], ParallelThreads=0, Id=assumeId)
conn.send(request)
conn.socket.shutdown(socket.SHUT_WR)
for msg in conn:
if type(msg) == messages.RegisterResponse:
# Has BackupCommunicationServers field -> connect to next backup in list
if msg.BackupCommunicationServers:
backup = msg.BackupCommunicationServers[0]
print("Sent to next BCS at {address:s}:{port:d}".format(address=backup['address'], port=backup['port']))
conn.socket.close()
connections_manager.remove(conn)
registerBackup(backup['address'], backup['port'], msg.Id)
return
# Registered at last communication server in list
else:
print("Registered successfully")
config.id = msg.Id
config.timeout = msg.Timeout
config.parent_address = address
config.parent_port = port
# Messages with state, sent from higher communication server
else:
parseMessageBCS(msg)
conn.socket.close()
connections_manager.remove(conn)