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annotate pytouhou/network.py @ 487:711c75115675

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Various netplay-related fixes.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Sat, 28 Sep 2013 20:11:41 +0200
parents c099802e2435
children d1f0bb0b7a17
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1 import socket
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2 from struct import Struct
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3 from select import select
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4 from time import time
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5
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6 from pytouhou.utils.helpers import get_logger
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7
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8 logger = get_logger(__name__)
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9
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10 MSG_STRUCT = Struct('!HHH')
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12 class Network(object):
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13 def __init__(self, port=8080, dest=None, selected_player=0):
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14 self.frame = 0
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15 self.keystate = 0
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16 self.old_keystate = 0
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17 self.remote_keystate = 0
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18
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19 self.selected_player = selected_player
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20
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21 self.remote_addr = dest
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22 self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
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23 self.sock.bind(('', port))
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26 def read_message(self):
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27 message = None
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29 start_time = time()
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30 delta = 1./60.
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32 rlist, _, _ = select([self.sock], [], [], delta)
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33 while rlist:
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34 msg, addr = rlist[0].recvfrom(MSG_STRUCT.size)
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35 # Check whether the message comes from the right address
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36 if self.frame == 0 or addr == self.remote_addr:
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37 self.remote_addr = addr
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39 frame, keystate, old_keystate = MSG_STRUCT.unpack(msg)
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41 # Check for well-formedness
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42 if frame in (self.frame, self.frame + 1):
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43 message = (frame, keystate, old_keystate)
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44 else:
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45 logger.error('Mismatch, got a message from %s, waiting for %s.', self.remote_addr, addr)
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47 # If no valid message has been read, wait for one as long as possible
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48 # else, read as much as we can without blocking.
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49 delta = 0 if message else max(0, 1./60. - (time() - start_time))
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50 rlist, _, _ = select(rlist, [], [], delta)
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52 return message
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55 def send_message(self):
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56 if self.remote_addr is not None:
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57 self.sock.sendto(MSG_STRUCT.pack(self.frame, self.keystate, self.old_keystate), self.remote_addr)
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60 def run_game_iter(self, game, keystate, other_keystate):
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61 keystates = [other_keystate, other_keystate]
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62 keystates[self.selected_player] = keystate
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63 game.run_iter(keystates)
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66 def run_iter(self, game, keystate):
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67 if game.frame % 3 == 0:
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68 # Phase 1: Update game with old data
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69 self.run_game_iter(game, self.keystate, self.remote_keystate)
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70 elif game.frame % 3 == 1:
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71 # Phase 2: Update data, send new data, update game with old data
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72 self.old_keystate, self.keystate = self.keystate, keystate
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73 self.frame = game.frame // 3
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74 self.send_message()
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75 self.run_game_iter(game, self.old_keystate, self.remote_keystate)
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76 elif game.frame % 3 == 2:
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77 # Phase 3: Send new data, get remote data, update game with new data
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78 self.send_message()
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79 # Follow one valid update
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80 message = self.read_message()
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81 if message:
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82 frame, keystate, old_keystate = message
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83 if frame == self.frame:
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84 self.remote_keystate = keystate
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85 elif frame == self.frame + 1:
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86 self.remote_keystate = old_keystate
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87 else:
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88 raise Exception #TODO
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89 self.run_game_iter(game, self.keystate, self.remote_keystate)
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90 elif game.frame > 2:
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91 logger.warn('Message not received in time, dropping frame.')
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