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server.py
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server.py
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#!/usr/bin/python
"""
Created on Thu Dec 1 15:41:13 2016
@author: pavla kratochvilova
"""
# Imports----------------------------------------------------------------------
from argparse import ArgumentParser
from time import sleep
import threading
import logging
import pika
# Custom imports --------------------------------------------------------------
import serverlib
import common
from common import send_message
from game import Game
# Setup Python logging --------------------------------------------------------
FORMAT = '%(asctime)-15s %(levelname)s %(message)s'
logging.basicConfig(level=logging.INFO, format=FORMAT)
LOG = logging.getLogger(__name__)
LOG.setLevel(logging.DEBUG)
# Constants -------------------------------------------------------------------
___NAME = 'Battleship Game Client'
___VER = '0.1.0.0'
___DESC = 'Battleship Game Client'
___BUILT = '2016-11-10'
# Classes ---------------------------------------------------------------------
class GameList(object):
'''List of game sessions.
'''
def __init__(self, channel, server_args, clients):
# Dict of running games
self.games = {}
# Communication
self.server_args = server_args
self.server_name = server_args.name
self.clients = clients
self.channel = channel
self.games_queue = channel.queue_declare(exclusive=True).method.queue
self.channel.queue_bind(exchange='direct_logs',
queue=self.games_queue,
routing_key=common.make_key_games(
self.server_name))
self.channel.basic_consume(self.reply_request,
queue=self.games_queue,
no_ack=True)
def add_game(self, name, owner, width, height):
'''Add game to the dict of games.
@param name: name of game
@param owner: owner of game
@param width: width of field of game
@param height: height of field of game
'''
# Create game in new thread
game = Game(self, self.server_args, name, owner, width, height)
self.games[name] = game
game.start()
# Send event about added game
msg = serverlib.make_e_game_open(name)
send_message(self.channel, msg,
common.make_key_game_advert(self.server_name))
return game
def remove_game(self, name):
'''Remove game from the dict of games.
@param name: name of game
'''
try:
del self.games[name]
# Send event about removed game
msg = serverlib.make_e_game_end(name)
send_message(self.channel, msg,
common.make_key_game_advert(self.server_name))
except KeyError:
pass
def get_games(self, state=None):
'''Get list of games, optionally filtering by state.
@param state: state of game
@return list: list of games
'''
if state is None:
return self.games
return [game for game in self.games.values() if game.state == state]
def process_request(self, msg_parts, properties):
'''Process request about list of games.
@param msg_parts: parsed message
@param properties: pika.spec.BasicProperties
@return String, response
'''
# Get list of games request
if msg_parts[0] == common.REQ_LIST_OPENED:
game_names = [game.name for game in self.get_games('opened')]
return serverlib.make_rsp_list_opened(game_names)
if msg_parts[0] == common.REQ_LIST_CLOSED:
game_names = [game.name for game in self.get_games('closed')]
return serverlib.make_rsp_list_closed(game_names)
# Create game request
if msg_parts[0] == common.REQ_CREATE_GAME:
if len(msg_parts) != 5 or msg_parts[1].strip() == '' or\
msg_parts[3].strip() == '' or msg_parts[4].strip() == '':
return serverlib.make_rsp_invalid_request()
game_name = msg_parts[1]
client_name = msg_parts[2]
width = msg_parts[3]
height = msg_parts[4]
if game_name in self.games:
return serverlib.make_rsp_name_exists()
if client_name not in self.clients.client_set:
return serverlib.make_rsp_permission_denied()
game = self.add_game(game_name, client_name, width, height)
game.wait_for_ready()
game.client_queues[client_name] = properties.reply_to
return serverlib.make_rsp_game_entered(game_name, 1)
# Join game request
if msg_parts[0] == common.REQ_JOIN_GAME:
if len(msg_parts) != 3:
return serverlib.make_rsp_invalid_request()
game_name = msg_parts[1]
client_name = msg_parts[2]
if game_name not in self.games:
return serverlib.make_rsp_name_doesnt_exist()
if client_name not in self.clients.client_set:
return serverlib.make_rsp_permission_denied()
if client_name not in self.games[game_name].players and\
self.games[game_name].state == 'closed':
return serverlib.make_rsp_permission_denied()
self.games[game_name].client_queues[client_name] =\
properties.reply_to
if client_name not in self.games[game_name].players:
self.games[game_name].players.add(client_name)
# Send event that new player was added
msg = serverlib.make_e_new_player(client_name)
send_message(self.channel, msg,
common.make_key_game_events(self.server_name,
game_name))
return serverlib.make_rsp_game_entered(game_name, 0)
# Spectating game request
if msg_parts[0] == common.REQ_SPECTATE_GAME:
if len(msg_parts) != 3:
return serverlib.make_rsp_invalid_request()
game_name = msg_parts[1]
client_name = msg_parts[2]
if game_name not in self.games:
return serverlib.make_rsp_name_doesnt_exist()
if client_name not in self.clients.client_set:
return serverlib.make_rsp_permission_denied()
if client_name in self.games[game_name].players:
return serverlib.make_rsp_permission_denied()
game = self.games[game_name]
game.spectators.add(client_name)
return serverlib.make_rsp_game_spectate(game_name, 0,
game.spectator_queue)
def reply_request(self, ch, method, properties, body):
'''Reply to request about list of games.
@param ch: pika.BlockingChannel
@param method: pika.spec.Basic.Deliver
@param properties: pika.spec.BasicProperties
@param body: str or unicode
'''
LOG.debug('Processing game list request.')
LOG.debug('Received message: %s', body)
msg_parts = body.split(common.SEP)
response = self.process_request(msg_parts, properties)
# Sending response
ch.basic_publish(exchange='direct_logs',
routing_key=properties.reply_to,
body=response)
LOG.debug('Sent response to client: %s', response)
class Clients(object):
'''Process client connections.
'''
def __init__(self, channel, server_name):
'''Set a set of client usernames, communication channel, and consuming.
@param channel: pika connection channel
@param server_name: name of server
'''
# Set of client usernames
self.client_set = set()
self.server_name = server_name
# Communication
self.channel = channel
self.connect_queue = channel.queue_declare(exclusive=True).method.queue
self.channel.queue_bind(exchange='direct_logs',
queue=self.connect_queue,
routing_key=self.server_name)
self.channel.basic_consume(self.process_client,
queue=self.connect_queue,
no_ack=True)
def process_client(self, ch, method, properties, body):
'''Process client's connection request.
@param ch: pika.BlockingChannel
@param method: pika.spec.Basic.Deliver
@param properties: pika.spec.BasicProperties
@param body: str or unicode
'''
LOG.debug('Processing connection request.')
LOG.debug('Received message: %s', body)
msg_parts = body.split(common.SEP)
response = None
# Connect request
if msg_parts[0] == common.REQ_CONNECT:
if len(msg_parts) != 2:
response = serverlib.make_rsp_invalid_request()
else:
client_name = msg_parts[1].strip()
if client_name in self.client_set:
response = serverlib.make_rsp_username_taken()
else:
self.client_set.add(msg_parts[1].strip())
response = serverlib.make_rsp_connected(self.server_name,
client_name)
# Disconnect request
elif msg_parts[0] == common.REQ_DISCONNECT:
try:
self.client_set.remove(msg_parts[1])
except KeyError:
pass
response = serverlib.make_rsp_disconnected()
# Sending response
ch.basic_publish(exchange='direct_logs',
routing_key=properties.reply_to,
body=response)
LOG.debug('Sent response to client: %s', response)
# Functions -------------------------------------------------------------------
def __info():
return '%s version %s (%s)' % (___NAME, ___VER, ___BUILT)
def publish_server_advertisements(server_on, channel, server_name, interval=2):
'''Publishes server adverts periodically.
@param server_on: indicate server running
@param channel: pika.BlockingChannel
@param server_name: name of server
@param interval: interval for publishing
'''
while server_on[0]:
channel.basic_publish(exchange='direct_logs',
routing_key=common.make_key_server_advert(),
body=server_name)
sleep(interval)
def stop_server(channel, server_name):
'''Publishes server advert about stopping server.
@param channel: pika.BlockingChannel
@param server_name: name of server
'''
channel.basic_publish(exchange='direct_logs',
routing_key=common.make_key_server_stop(),
body=server_name)
# Main function ---------------------------------------------------------------
if __name__ == '__main__':
# Parsing arguments
parser = ArgumentParser()
parser.add_argument(
'-H', '--host',
help='Address of the RabbitMQ server, defaults to %s' %
common.DEFAULT_SERVER_INET_ADDR,
default=common.DEFAULT_SERVER_INET_ADDR
)
parser.add_argument(
'-p', '--port',
help='Port of the RabbitMQ server, defaults to %d' %
common.DEFAULT_SERVER_PORT,
default=common.DEFAULT_SERVER_PORT
)
parser.add_argument('-n', '--name',
help='Server name.',
required=True)
args = parser.parse_args()
# Connection
connection = pika.BlockingConnection(
pika.ConnectionParameters(host=args.host, port=args.port)
)
channel = connection.channel()
channel.exchange_declare(exchange='direct_logs', type='direct')
# Client connections
clients = Clients(channel, args.name)
# Server advertisements
server_on = [True]
t = threading.Thread(target=publish_server_advertisements,
args=(server_on, channel, args.name))
t.setDaemon(True)
t.start()
LOG.debug('Started server advertising.')
# Dict of games
game_list = GameList(channel, args, clients)
try:
while True:
channel.start_consuming()
except KeyboardInterrupt as e:
LOG.debug('Crtrl+C issued ...')
LOG.info('Terminating server ...')
server_on[0] = False
stop_server(channel, args.name)
LOG.debug('Stopped advertising.')
# Send message to all games control queues to stop consuming.
for game in game_list.games.values():
channel.basic_publish(exchange='direct_logs',
routing_key=game.control_queue,
body='')