remove session cookie when server restarts

app.py

@@ -1,5 +1,6 @@
-from flask import Flask, render_template, request, session
+from flask import Flask, render_template, request, session, make_response
 import random
+import socket
 import time
 
 app = Flask(__name__)
@@ -12,7 +13,10 @@ moves = ['forward', 'forward x2', 'forward x3', 'backward', 'turn left', 'turn r
 class Game:
     def __init__(self):
         self.action_stack = {}
-        self.processing_done = False
+        self.processing_done = False    # indicates whether all commands in the current round have been processed
+
+        self.comm_socket = socket.socket()  # socket for communicating with the program controlling the robots
+
 
     def ready(self):
         # have all players chosen an action?
@@ -35,6 +39,9 @@ class Game:
                 current_actions += [(p, self.action_stack[p][i])]
             print("actions in step {}: {}".format(i, ["robot {} action {}".format(c[0], c[1]) for c in current_actions]))
 
+            #self.comm_socket.send()
+
+
         # clear the action stack for the next round
         self.action_stack = {}
 
@@ -116,11 +123,19 @@ def hello_world():
             p = Player()
             session['player_id'] = p.id
             players[p.id] = p
+            player_id = session['player_id']
         else:
             return "Sorry, maximum number of players reached!"
-
-    player_id = session['player_id']
+    else:
+        player_id = session['player_id']
+        if Player.player_counter < player_id + 1:
+            session.clear()
+            response = make_response('Please reload the page!')
+            #response.set_cookie('player_id', '', expires=0)
+            return response
     player_hand = players[player_id].player_hand
+
+
     if request.method == 'GET':
         return render_template('drag_example.html', cmds=player_hand, player_id=player_id)
     elif request.method == 'POST':