import socketserver
import threading
import queue
+from parser import ArgError, Parser
+
# Avoid "Address already in use" errors.
socketserver.TCPServer.allow_reuse_address = True
return fib(n-1) + fib(n-2)
-class ArgumentError(Exception):
- pass
-
-
class CommandHandler:
def __init__(self, queues_out):
from multiprocessing import Pool
self.queues_out = queues_out
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):
+ """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))
+
def send_to(self, connection_id, msg):
"""Send msg to client of connection_id."""
self.queues_out[connection_id].put(msg)
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))
+ self.send_all('TERRAIN\n' + self.quoted(self.world.map_))
+ for thing in self.world.things:
+ self.send_all('THING TYPE:' + thing.type + ' '
+ + self.stringify_yx(thing.position))
+
def proceed_to_next_player_turn(self, connection_id):
"""Run game world turns until player can decide their next step.
self.world.player.proceed(is_AI=False)
if self.world.player.task is None:
break
- self.send_all('NEW_TURN ' + str(self.world.turn))
- self.send_all('MAP_SIZE ' + self.stringify_yx(self.world.map_size))
- self.send_all('TERRAIN\n' + self.quoted(self.world.map_))
- for thing in self.world.things:
- self.send_all('THING TYPE:' + thing.type + ' '
- + self.stringify_yx(thing.position))
+ 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_to_next_player_turn(connection_id)
+ 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_to_next_player_turn(connection_id)
+
+ 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_fib(self, tokens, connection_id):
+ 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.
"""
- if len(tokens) < 2:
- raise ArgumentError('FIB NEEDS AT LEAST ONE ARGUMENT')
- numbers = []
- for token in tokens[1:]:
- if token == '0' or not token.isdigit():
- raise ArgumentError('FIB ARGUMENTS MUST BE INTEGERS > 0')
- numbers += [int(token)]
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_p(self, connection_id):
+ 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
self.send_all('TURN_FINISHED ' + str(self.world.turn))
sleep(1)
self.world.turn += 1
- self.send_all('NEW_TURN ' + str(self.world.turn))
- self.send_all('MAP_SIZE ' + self.stringify_yx(self.world.map_size))
- self.send_all('TERRAIN\n' + self.quoted(self.world.map_))
- for thing in self.world.things:
- self.send_all('THING TYPE:' + thing.type + ' '
- + self.stringify_yx(thing.position))
+ self.send_all_gamestate()
self.pool_result = self.pool.map_async(fib, (35, 35))
- def cmd_get_turn(self, connection_id):
- """Send world.turn to caller."""
- self.send_to(connection_id, str(self.world.turn))
-
- 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 ArgumentError('MOVE ARGUMENT MUST BE ONE OF: '
- 'UP, DOWN, RIGHT, LEFT')
- self.world.player.set_task('move', direction=direction)
- self.proceed_to_next_player_turn(connection_id)
-
- def cmd_wait(self, connection_id):
- """Set player task to 'wait', finish player turn."""
- self.world.player.set_task('wait')
- self.proceed_to_next_player_turn(connection_id)
-
- 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_all(self, tokens, input_):
- """Send message in input_ beyond tokens[0] to all clients."""
- msg = input_[len(tokens[0]) + 1:]
- self.send_all(msg)
-
- 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]
- try:
- if len(tokens) == 0:
- self.send_to(connection_id, 'EMPTY COMMAND')
- elif len(tokens) == 1 and tokens[0] == 'INC_P':
- self.cmd_inc_p(connection_id)
- elif len(tokens) == 1 and tokens[0] == 'GET_TURN':
- self.cmd_get_turn(connection_id)
- elif len(tokens) == 1 and tokens[0] == 'WAIT':
- self.cmd_wait(connection_id)
- elif len(tokens) == 2 and tokens[0] == 'MOVE':
- self.cmd_move(tokens[1], 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')
- except ArgumentError as e:
- self.send_to(connection_id, 'ARGUMENT ERROR: ' + str(e))
-
def io_loop(q):
"""Handle commands coming through queue q, send results back.
projects / plomrogue2-experiments / blobdiff