import socketserver
import threading
import queue
+import sys
+import os
+from parser import ArgError, Parser
+from server_.game import World, GameError
+
# Avoid "Address already in use" errors.
socketserver.TCPServer.allow_reuse_address = True
self.request.close()
-class World:
- turn = 0
-
-
def fib(n):
"""Calculate n-th Fibonacci number. Very inefficiently."""
if n in (1, 2):
class CommandHandler:
- def __init__(self, queues_out):
+ def __init__(self, queues_out={}):
from multiprocessing import Pool
self.queues_out = queues_out
- self.pool = Pool()
self.world = World()
+ self.parser = Parser(self)
+ # 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.
+ self.pool = Pool()
+ self.pool_result = None
+
+ def handle_input(self, input_, connection_id=None, abort_on_error=False):
+ """Process input_ to command grammar, call command handler if found."""
+ try:
+ command = self.parser.parse(input_)
+ if command is None:
+ self.send_to(connection_id, 'UNHANDLED INPUT')
+ else:
+ command(connection_id=connection_id)
+ except ArgError as e:
+ self.send_to(connection_id, 'ARGUMENT ERROR: ' + str(e))
+ if abort_on_error:
+ exit(1)
+ except GameError as e:
+ self.send_to(connection_id, 'GAME ERROR: ' + str(e))
+ if abort_on_error:
+ exit(1)
def send_to(self, connection_id, msg):
- """Send msg to client of connection_id."""
- self.queues_out[connection_id].put(msg)
+ """Send msg to client of connection_id; if no later, print instead."""
+ if connection_id:
+ self.queues_out[connection_id].put(msg)
+ else:
+ print(msg)
def send_all(self, msg):
"""Send msg to all clients."""
for connection_id in self.queues_out:
self.send_to(connection_id, msg)
- def cmd_fib(self, tokens, connection_id):
+ def stringify_yx(self, tuple_):
+ """Transform tuple (y,x) into string 'Y:'+str(y)+',X:'+str(x)."""
+ return 'Y:' + str(tuple_[0]) + ',X:' + str(tuple_[1])
+
+ def quoted(self, string):
+ """Quote and 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 send_all_gamestate(self):
+ """Send out game state data relevant to clients."""
+ self.send_all('NEW_TURN ' + str(self.world.turn))
+ self.send_all('MAP_SIZE ' + self.stringify_yx(self.world.map_size))
+ for y in range(self.world.map_size[0]):
+ width = self.world.map_size[1]
+ terrain_line = self.world.map_[y * width:(y + 1) * width]
+ self.send_all('TERRAIN_LINE %5s %s' % (y, self.quoted(terrain_line)))
+ for thing in self.world.things:
+ self.send_all('THING TYPE:' + thing.type_ + ' '
+ + self.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_all('TURN_FINISHED ' + str(self.world.turn))
+ self.world.proceed_to_next_player_turn()
+ self.send_all_gamestate()
+
+ def cmd_MOVE(self, direction, connection_id):
+ """Set player task to 'move' with direction arg, finish player turn."""
+ if direction not in {'UP', 'DOWN', 'RIGHT', 'LEFT'}:
+ raise ArgError('Move argument must be one of: '
+ 'UP, DOWN, RIGHT, LEFT')
+ self.world.player.set_task('move', direction=direction)
+ self.proceed()
+ cmd_MOVE.argtypes = 'string'
+
+ def cmd_WAIT(self, connection_id):
+ """Set player task to 'wait', finish player turn."""
+ self.world.player.set_task('wait')
+ self.proceed()
+
+ def cmd_GET_TURN(self, connection_id):
+ """Send world.turn to caller."""
+ self.send_to(connection_id, str(self.world.turn))
+
+ def cmd_ECHO(self, msg, connection_id):
+ """Send msg to caller."""
+ self.send_to(connection_id, msg)
+ cmd_ECHO.argtypes = 'string'
+
+ def cmd_ALL(self, msg, connection_id):
+ """Send msg to all clients."""
+ self.send_all(msg)
+ cmd_ALL.argtypes = 'string'
+
+ def cmd_FIB(self, numbers, connection_id):
"""Reply with n-th Fibonacci numbers, n taken from tokens[1:].
Numbers are calculated in parallel as far as possible, using fib().
A 'CALCULATING …' message is sent to caller before the result.
"""
- fib_fail = 'MALFORMED FIB REQUEST'
- if len(tokens) < 2:
- self.send_to(connection_id, fib_fail)
- return
- numbers = []
- for token in tokens[1:]:
- if token != '0' and token.isdigit():
- numbers += [int(token)]
- else:
- self.send_to(connection_id, fib_fail)
- return
self.send_to(connection_id, 'CALCULATING …')
results = self.pool.map(fib, numbers)
reply = ' '.join([str(r) for r in results])
self.send_to(connection_id, reply)
+ cmd_FIB.argtypes = 'seq:int:nonneg'
- def cmd_inc(self, connection_id):
- """Increment world.turn, send TURN_FINISHED, NEW_TURN to everyone."""
- self.send_all('TURN_FINISHED ' + str(self.world.turn))
- self.world.turn += 1
- self.send_all('NEW_TURN ' + str(self.world.turn))
-
- def cmd_get_turn(self, connection_id):
- """Send world.turn to caller."""
- self.send_to(connection_id, str(self.world.turn))
-
- def cmd_echo(self, tokens, input_, connection_id):
- """Send message in input_ beyond tokens[0] to caller."""
- msg = input_[len(tokens[0]) + 1:]
- self.send_to(connection_id, msg)
+ def cmd_INC_P(self, connection_id):
+ """Increment world.turn, send game turn data to everyone.
- def cmd_all(self, tokens, input_):
- """Send message in input_ beyond tokens[0] to all clients."""
- msg = input_[len(tokens[0]) + 1:]
- self.send_all(msg)
+ 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.
- def handle_input(self, input_, connection_id):
- """Process input_ to command grammar, call command handler if found."""
- tokens = [token for token in input_.split(' ') if len(token) > 0]
- if len(tokens) == 0:
- self.send_to(connection_id, 'EMPTY COMMAND')
- elif len(tokens) == 1 and tokens[0] == 'INC':
- self.cmd_inc(connection_id)
- elif len(tokens) == 1 and tokens[0] == 'GET_TURN':
- self.cmd_get_turn(connection_id)
- elif len(tokens) >= 1 and tokens[0] == 'ECHO':
- self.cmd_echo(tokens, input_, connection_id)
- elif len(tokens) >= 1 and tokens[0] == 'ALL':
- self.cmd_all(tokens, input_)
- elif len(tokens) >= 1 and tokens[0] == 'FIB':
- # TODO: Should this really block the whole loop?
- self.cmd_fib(tokens, connection_id)
- else:
- self.send_to(connection_id, 'UNKNOWN COMMAND')
+ 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_all('TURN_FINISHED ' + str(self.world.turn))
+ sleep(1)
+ self.world.turn += 1
+ self.send_all_gamestate()
+ self.pool_result = self.pool.map_async(fib, (35, 35))
-def io_loop(q):
+def io_loop(q, commander):
"""Handle commands coming through queue q, send results back.
Commands from q are expected to be tuples, with the first element either
which to send replies.
A 'COMMAND' command is specified in greater detail by a string that is the
- tuple's third element. CommandHandler takes care of processing this and
- sending out replies.
+ tuple's third element. The commander CommandHandler takes care of processing
+ this and sending out replies.
"""
- queues_out = {}
- command_handler = CommandHandler(queues_out)
while True:
x = q.get()
command_type = x[0]
connection_id = x[1]
content = None if len(x) == 2 else x[2]
if command_type == 'ADD_QUEUE':
- queues_out[connection_id] = content
+ commander.queues_out[connection_id] = content
elif command_type == 'COMMAND':
- command_handler.handle_input(content, connection_id)
+ commander.handle_input(content, connection_id)
elif command_type == 'KILL_QUEUE':
- del queues_out[connection_id]
+ del commander.queues_out[connection_id]
+if len(sys.argv) != 2:
+ print('wrong number of arguments, expected one (game file)')
+ exit(1)
+game_file_name = sys.argv[1]
+commander = CommandHandler()
+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='')
+ commander.handle_input(line, abort_on_error=True)
q = queue.Queue()
-c = threading.Thread(target=io_loop, daemon=True, args=(q,))
+c = threading.Thread(target=io_loop, daemon=True, args=(q, commander))
c.start()
server = Server(q, ('localhost', 5000), IO_Handler)
try:
projects / plomrogue2-experiments / blobdiff