class CThread(threading.Thread):
def __init__(self, c_sock, c_addr, file='out/serverTimeData.txt'):
threading.Thread.__init__(self) # create a new thread
self._socket = c_sock
self._addr = c_addr
self._socket.setblocking(False) # non-blocking mode
print('A Client has connected at address:\t', self._addr)
self._ts = TimeStamp(datetime.datetime.now())
self._file = open(file, 'a')
""" Send a TimeStamp, if it is time to do so. """
def _send(self):
msg = self._ts.message(self._addr, socket.gethostbyname(socket.gethostname()), datetime.datetime.now())
if msg is not None:
try:
self._socket.sendall(bytes(msg, 'UTF-8')) # time to send the TimeStamp
self._file.write(msg + '\n') # write the TimeStamp to file
except ConnectionAbortedError:
print('A Client has disconnected from:\t', self._addr)
return -1
except ConnectionResetError:
print('A Client has forcibly disconnected from:\t', self._addr)
return -1
return 0
""" Receive a TimeStamp, if it has been sent, without blocking the thread. """
def _receive(self, buff_size=2048):
try:
msg = self._socket.recv(buff_size).decode()
self._file.write(cmd.drop_commands_for_ts(msg) + '\n')
if cmd.got_server(msg): # save the ip_addr:port of the client's server
client_addr.append(cmd.parse(msg))
client_thread.append(self)
if cmd.wants_peers(msg): # send the list of peers for the client to connect
self._socket.sendall(bytes(cmd.client_to_str(client_addr), 'UTF-8'))
except socket.error:
pass
""" Override Thread.run() to send/receive messages through the socket. """
def run(self, buff_size=2048):
while True:
if self._send() < 0: # keep sending TimeStamps?
self.exit()
return
self._receive() # get a TimeStamp
""" Has this connection closed? """
def test(self):
try:
self._socket.send(cmd.test)
except:
return True
return False
""" Close the connection and file. """
def exit(self):
self._socket.close()
self._file.close()
class Client(threading.Thread):
def __init__(self, id, host=cmd.host, port=cmd.port):
threading.Thread.__init__(self) # create a new thread
self._socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self._socket.connect((host, port))
self._socket.setblocking(False) # non-blocking mode
self._host_ip = host
self._my_ip = socket.gethostbyname(socket.gethostname())
self._ts = TimeStamp(datetime.datetime.now())
self._file = open(fname0 + str(id) + fname1,
'a') # append to this file
self._peer = PeerNetwork(id,
self._file.name) # has a listener for peers
self._id = id
self._me_str = 'Client ' + str(self._id) + ' '
""" Send a TimeStamp, if it is time to do so. """
def _send(self):
msg = self._ts.message(self._my_ip, self._host_ip,
datetime.datetime.now())
if msg is not None:
self._socket.sendall(bytes(msg,
'UTF-8')) # time to send the TimeStamp
self._file.write(msg + '\n') # write to file
""" Receive a TimeStamp, if it has been sent, without blocking the thread. """
def _receive(self, buff_size=2048):
try:
msg = self._socket.recv(buff_size).decode()
msg = cmd.clean(msg)
self._file.write(msg + '\n') # write to file
except ConnectionAbortedError:
print('Server has closed the connection.')
self.exit()
except ConnectionResetError:
print('Server has forcibly closed the connection.')
self.exit()
except BlockingIOError:
# print('The connection is waiting for I/O operation.')
pass
""" Send the server this Client's listener address. """
def _invite_peers(self):
self._socket.sendall(
bytes(cmd.s_cmd + str(self.get_server_address()), 'UTF-8'))
print(self._me_str, 'has listener socket at address',
self.get_server_address())
""" Connect to Peers in the network, and send the files. """
def _connect_to_peers(self):
peer_list = self._get_peers()
print(self._me_str + str(peer_list) + '\t' + str(len(peer_list)))
connected = False
while not connected: # attempt the connection to the full peer list
try:
self._peer.connect_and_send(peer_list)
connected = True
except ConnectionRefusedError:
continue
""" Get the list of peers from the server in a readable format. """
def _get_peers(self, buff_size=2048):
self._socket.sendall(bytes(cmd.g_cmd, 'UTF-8'))
pl = ''
while pl == '': # get the list of Peers' listener addresses
try:
msg = self._socket.recv(buff_size).decode()
pl, ts = cmd.get_pl_and_ts(msg)
if ts != '':
self._file.write(
ts + '\n') # write the TimeStamp to file, if any
except:
continue
return pl # convert the list to (host, port) tuples
""" Override Thread.run() to send/receive messages through the socket. """
def run(self):
self._peer.start() # tell the server this Client's listener address
self._invite_peers()
while not self._ts.finished(datetime.datetime.now()):
self._receive() # get a TimeStamp; exit on error
self._send() # send the TimeStamp
print(self._me_str + 'finished exchanging TimeStamps with the Server.')
self._connect_to_peers()
print(self._me_str + 'finished sending TimeStamp file to Peers.')
# self.exit()
""" Close the connection and file. """
def exit(self):
self._peer.exit()
self._socket.close()
self._file.close()
print(self._me_str, 'disconnected at', datetime.datetime.now())
def get_server_address(self):
return self._peer.get_host()