#!/usr/bin/env python3
-
-import socketserver
-import plom_socket_io
-import threading
-import time
-
-# Avoid "Address already in use" errors.
-socketserver.TCPServer.allow_reuse_address = True
-
-
-class Server(socketserver.ThreadingTCPServer):
- """Bind together threaded IO handling server and world state (counter)."""
-
- def __init__(self, counter, *args, **kwargs):
- super().__init__(*args, **kwargs)
- self.counter = counter
- self.daemon_threads = True # Else, server's threads have daemon=False.
+import sys
+import os
+import parser
+import server_.game
+import server_.io
+import game_common
def fib(n):
- """Calculate n-th Fibonacci number."""
+ """Calculate n-th Fibonacci number. Very inefficiently."""
if n in (1, 2):
return 1
else:
return fib(n-1) + fib(n-2)
-class IO_Handler(socketserver.BaseRequestHandler):
+class CommandHandler(server_.game.Commander):
+
+ def __init__(self, game_file_name):
+ self.queues_out = {}
+ self.world = server_.game.World()
+ self.parser = parser.Parser(self)
+ self.game_file_name = game_file_name
+ # self.pool and self.pool_result are currently only needed by the FIB
+ # command and the demo of a parallelized game loop in cmd_inc_p.
+ from multiprocessing import Pool
+ self.pool = Pool()
+ self.pool_result = None
+
+ def quote(self, string):
+ """Quote & escape string so client interprets it as single token."""
+ quoted = []
+ quoted += ['"']
+ for c in string:
+ if c in {'"', '\\'}:
+ quoted += ['\\']
+ quoted += [c]
+ quoted += ['"']
+ return ''.join(quoted)
+
+ def handle_input(self, input_, connection_id=None, store=True):
+ """Process input_ to command grammar, call command handler if found."""
+ from inspect import signature
+
+ def answer(connection_id, msg):
+ if connection_id:
+ self.send(msg, connection_id)
+ else:
+ print(msg)
+
+ try:
+ command = self.parser.parse(input_)
+ if command is None:
+ answer(connection_id, 'UNHANDLED_INPUT')
+ else:
+ if 'connection_id' in list(signature(command).parameters):
+ command(connection_id=connection_id)
+ else:
+ command()
+ if store:
+ with open(self.game_file_name, 'a') as f:
+ f.write(input_ + '\n')
+ except parser.ArgError as e:
+ answer(connection_id, 'ARGUMENT_ERROR ' + self.quote(str(e)))
+ except server_.game.GameError as e:
+ answer(connection_id, 'GAME_ERROR ' + self.quote(str(e)))
+
+ def send(self, msg, connection_id=None):
+ if connection_id:
+ self.queues_out[connection_id].put(msg)
+ else:
+ for connection_id in self.queues_out:
+ self.queues_out[connection_id].put(msg)
+
+ def send_gamestate(self, connection_id=None):
+ """Send out game state data relevant to clients."""
+
+ def stringify_yx(tuple_):
+ """Transform tuple (y,x) into string 'Y:'+str(y)+',X:'+str(x)."""
+ return 'Y:' + str(tuple_[0]) + ',X:' + str(tuple_[1])
+
+ self.send('NEW_TURN ' + str(self.world.turn))
+ self.send('MAP_SIZE ' + stringify_yx(self.world.map_.size))
+ visible_map = self.world.get_player().get_visible_map()
+ for y in range(self.world.map_.size[0]):
+ self.send('VISIBLE_MAP_LINE %5s %s' %
+ (y, self.quote(visible_map.get_line(y))))
+ visible_things = self.world.get_player().get_visible_things()
+ for thing in visible_things:
+ self.send('THING_TYPE %s %s' % (thing.id_, thing.type_))
+ self.send('THING_POS %s %s' % (thing.id_,
+ stringify_yx(thing.position)))
+
+ def proceed(self):
+ """Send turn finish signal, run game world, send new world data.
+
+ First sends 'TURN_FINISHED' message, then runs game world
+ until new player input is needed, then sends game state.
+ """
+ self.send('TURN_FINISHED ' + str(self.world.turn))
+ self.world.proceed_to_next_player_turn()
+ msg = str(self.world.get_player().last_task_result)
+ self.send('LAST_PLAYER_TASK_RESULT ' + self.quote(msg))
+ self.send_gamestate()
- def handle(self):
- """Loop recv for input, send replies; also, send regular counter value.
+ def cmd_FIB(self, numbers, connection_id):
+ """Reply with n-th Fibonacci numbers, n taken from tokens[1:].
- If input is 'QUIT', send reply 'BYE' and end loop / connection.
- Otherwise, use handle_message to interpret and enact commands.
+ Numbers are calculated in parallel as far as possible, using fib().
+ A 'CALCULATING …' message is sent to caller before the result.
"""
- def caught_send(socket, message):
- """Send message by socket, catch broken socket connection error."""
- try:
- plom_socket_io.send(socket, message)
- except plom_socket_io.BrokenSocketConnection:
- pass
-
- def send_counter_loop(socket, counter, kill):
- """Every 5 seconds, send state of counter[0] until kill[0] set."""
- while not kill[0]:
- caught_send(socket, 'COUNTER ' + str(counter[0]))
- time.sleep(5)
-
- def handle_message(message):
- """Evaluate message for tasks to perform, yield result.
-
- Accepts one command: FIB, followed by positive integers, all tokens
- separated by whitespace. Will calculate and return for each such
- integer n the n-th Fibonacci number. Uses multiprocessing to
- perform multiple such calculations in parallel. Yields a
- 'CALCULATING …' message before the calculation starts, and finally
- yields a message containing the results. (The 'CALCULATING …'
- message coming before the results message is currently the main
- reason this works as a generator function using yield.)
-
- When no command can be read into the message, just yields a 'NO
- COMMAND UNDERSTOOD:', followed by the message.
- """
- from multiprocessing import Pool
- tokens = message.split(' ')
- if tokens[0] == 'FIB':
- msg_fail_fib = 'MALFORMED FIB REQUEST'
- if len(tokens) < 2:
- yield msg_fail_fib
- return
- numbers = []
- for token in tokens[1:]:
- if token != '0' and token.isdigit():
- numbers += [int(token)]
- elif token == '':
- continue
- else:
- yield msg_fail_fib
- return
- yield 'CALCULATING …'
- reply = ''
- with Pool(len(numbers)) as p:
- results = p.map(fib, numbers)
- reply = ' '.join([str(r) for r in results])
- yield reply
- return
- yield 'NO COMMAND UNDERSTOOD: %s' % message
-
- print('CONNECTION FROM:', str(self.client_address))
- counter_loop_killer = [False]
- send_count = threading.Thread(target=send_counter_loop,
- kwargs={'counter': self.server.counter,
- 'socket': self.request,
- 'kill': counter_loop_killer})
- send_count.start()
- for message in plom_socket_io.recv(self.request):
- if message is None:
- print('RECEIVED MALFORMED MESSAGE')
- caught_send(self.request, 'bad message')
- elif 'QUIT' == message:
- caught_send(self.request, 'BYE')
- break
- else:
- print('RECEIVED MESSAGE:', message)
- for reply in handle_message(message):
- caught_send(self.request, reply)
- counter_loop_killer = [True]
- print('CONNECTION CLOSED:', str(self.client_address))
- self.request.close()
-
-
-def inc_loop(counter, interval):
- """Loop incrementing counter every interval seconds."""
- while True:
- time.sleep(interval)
- counter[0] += 1
-
-
-counter = [0]
-b = threading.Thread(target=inc_loop, daemon=True, kwargs={'counter': counter,
- 'interval': 1})
-b.start()
-server = Server(counter, ('localhost', 5000), IO_Handler)
-try:
- server.serve_forever()
-except KeyboardInterrupt:
- pass
-finally:
- print('Killing server')
- server.server_close()
+ self.send('CALCULATING …', connection_id)
+ results = self.pool.map(fib, numbers)
+ reply = ' '.join([str(r) for r in results])
+ self.send(reply, connection_id)
+ cmd_FIB.argtypes = 'seq:int:nonneg'
+
+ def cmd_INC_P(self, connection_id):
+ """Increment world.turn, send game turn data to everyone.
+
+ To simulate game processing waiting times, a one second delay between
+ TURN_FINISHED and NEW_TURN occurs; after NEW_TURN, some expensive
+ calculations are started as pool processes that need to be finished
+ until a further INC finishes the turn.
+
+ This is just a demo structure for how the game loop could work when
+ parallelized. One might imagine a two-step game turn, with a non-action
+ step determining actor tasks (the AI determinations would take the
+ place of the fib calculations here), and an action step wherein these
+ tasks are performed (where now sleep(1) is).
+ """
+ from time import sleep
+ if self.pool_result is not None:
+ self.pool_result.wait()
+ self.send('TURN_FINISHED ' + str(self.world.turn))
+ sleep(1)
+ self.world.turn += 1
+ self.send_gamestate()
+ self.pool_result = self.pool.map_async(fib, (35, 35))
+
+
+if len(sys.argv) != 2:
+ print('wrong number of arguments, expected one (game file)')
+ exit(1)
+game_file_name = sys.argv[1]
+command_handler = CommandHandler(game_file_name)
+if os.path.exists(game_file_name):
+ if not os.path.isfile(game_file_name):
+ print('game file name does not refer to a valid game file')
+ else:
+ with open(game_file_name, 'r') as f:
+ lines = f.readlines()
+ for i in range(len(lines)):
+ line = lines[i]
+ print("FILE INPUT LINE %s: %s" % (i, line), end='')
+ command_handler.handle_input(line, store=False)
+else:
+ command_handler.handle_input('MAP_SIZE Y:5,X:5')
+ command_handler.handle_input('TERRAIN_LINE 0 "xxxxx"')
+ command_handler.handle_input('TERRAIN_LINE 1 "x...x"')
+ command_handler.handle_input('TERRAIN_LINE 2 "x.X.x"')
+ command_handler.handle_input('TERRAIN_LINE 3 "x...x"')
+ command_handler.handle_input('TERRAIN_LINE 4 "xxxxx"')
+ command_handler.handle_input('THING_TYPE 0 human')
+ command_handler.handle_input('THING_POS 0 Y:3,X:3')
+ command_handler.handle_input('THING_TYPE 1 monster')
+ command_handler.handle_input('THING_POS 1 Y:1,X:1')
+
+
+server_.io.run_server_with_io_loop(command_handler)
projects / plomrogue2-experiments / blobdiff