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#
# PyQt5-based video-sync example for VLC Python bindings
# Copyright (C) 2009-2010 the VideoLAN team
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
#
"""
The client/server classes that keep multiple VLC python bindings players
synchronized.
Author: Saveliy Yusufov, Columbia University, sy2685@columbia.edu
Date: 25 January 2019
"""
import os
import platform
import socket
import sys
import struct
import threading
import logging
from concurrent import futures
logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)
logger.setLevel(logging.DEBUG)
# create console handler and set level to debug
ch = logging.StreamHandler()
ch.setLevel(logging.DEBUG)
# create formatter
formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")
# add formatter to ch
ch.setFormatter(formatter)
# add ch to logger
logger.addHandler(ch)
class Server:
"""Data sender server"""
def __init__(self, host, port, data_queue):
if platform.system() == "Windows":
# Create a TCP/IP socket
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# Bind the socket to the port
logger.info("Server started on %s port %s", host, port)
self.sock.bind((host, port))
else:
server_address = "./uds_socket"
# Make sure the socket does not already exist
try:
os.unlink(server_address)
except OSError:
if os.path.exists(server_address):
raise
# Create a UDS socket
self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
# Bind the socket to the address
logger.info("Server starting up on %s", server_address)
self.sock.bind(server_address)
# Listen for incoming connections
self.sock.listen(5)
self.clients = set()
self.data_queue = data_queue
listener_thread = threading.Thread(target=self.listen_for_clients, args=())
listener_thread.daemon = True
listener_thread.start()
def listen_for_clients(self):
logger.info("Now listening for clients")
t = threading.Thread(target=self.data_sender, args=())
t.daemon = True
t.start()
while True:
client, _ = self.sock.accept()
logger.info("Accepted Connection from: %s", client)
self.clients.add(client)
def data_sender(self):
while True:
data = self.data_queue.get()
data = str(data).encode()
msg = struct.pack(">I", len(data)) + data
with futures.ThreadPoolExecutor(max_workers=5) as ex:
for client in self.clients:
ex.submit(self.sendall, client, msg)
def sendall(self, client, data):
"""Wraps socket module's `sendall` function"""
try:
client.sendall(data)
except socket.error:
logger.exception("Connection to client: %s was broken!", client)
client.close()
self.clients.remove(client)
class Client:
"""Data receiver client"""
def __init__(self, address, port, data_queue):
self.data_queue = data_queue
if platform.system() == "Windows":
# Create a TCP/IP socket
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# Connect the socket to the port where the server is listening
logger.info("Connecting to %s port %s", address, port)
self.sock.connect((address, port))
else:
# Create a UDS socket
self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
# Connect the socket to the port where the server is listening
server_address = "./uds_socket"
logger.info("New client connecting to %s", server_address)
try:
self.sock.connect(server_address)
except socket.error:
logger.exception()
sys.exit(1)
thread = threading.Thread(target=self.data_receiver, args=())
thread.daemon = True
thread.start()
def recv_all(self, size):
"""Helper function to recv `size` number of bytes, or return False"""
data = bytearray()
while (len(data) < size):
packet = self.sock.recv(size - len(data))
if not packet:
return False
data.extend(packet)
return data
def recv_msg(self):
"""Receive the message size, n, and receive n bytes into a buffer"""
raw_msg_size = self.recv_all(4)
if not raw_msg_size:
return False
msg_size = struct.unpack(">I", raw_msg_size)[0]
return self.recv_all(msg_size)
def data_receiver(self):
"""Handles receiving, parsing, and queueing data"""
logger.info("New data receiver thread started.")
try:
while True:
raw_data = self.recv_msg()
if raw_data:
data = raw_data.decode()
if 'd' in set(data):
self.data_queue.queue.clear()
continue
else:
self.data_queue.put(data)
except:
logger.exception("Closing socket: %s", self.sock)
self.sock.close()
return
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