implemented checking for network connections in gui

pynpong/networking/client.py

@@ -0,0 +1,91 @@
+"""
+Networking client to connect to a server and find server hosts
+"""
+import ipaddress
+import random
+
+import psutil
+import socket
+
+SERVER_PORT = 29987
+SERVER_BUFFER = 1024
+SCAN_TIMEOUT = 3
+
+
+class InterfaceInfo:
+    """
+    Class used for storing interface information to make it easier to use
+    """
+
+    def __init__(self, interface_name, network):
+        self.interface_name = interface_name
+        self.network = network
+
+    def __str__(self):
+        return 'Interface:{0}, Network:{1}'.format(self.interface_name, self.network)
+
+    def __repr__(self):
+        return '(Interface:{0}, Network:{1})'.format(self.interface_name, self.network)
+
+
+def request_server_info(server_ip, server_port):
+    """
+    Request server info from a PyPong server given an IP and a port
+    :param server_ip: Server IP to request info from
+    :param server_port: Port to connect to server on
+    :return response given by server (or lack thereof):
+    """
+    request = 'PYPONGREQ;SVRINFO'
+
+    udp_client_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    udp_client_socket.settimeout(SCAN_TIMEOUT + (SCAN_TIMEOUT * random.random()))
+    try:
+        udp_client_socket.sendto(str.encode(request, 'UTF-8'), (server_ip, server_port))
+    except OSError:
+        pass
+    try:
+        server_response = udp_client_socket.recvfrom(SERVER_BUFFER)[0].decode('UTF-8')
+    except TimeoutError:
+        server_response = '{0};TIMEOUT'.format(server_ip)
+    except UnicodeDecodeError:
+        server_response = '{0};MANGLED_RESPONSE'.format(server_ip)
+
+    udp_client_socket.close()
+    return server_response
+
+
+def get_interface_info():
+    raw_interface_data = psutil.net_if_addrs()
+    interface_data = []
+
+    # Extract needed information from psutil and put it into a InterfaceInfo object
+    for interface in raw_interface_data:
+        address = (raw_interface_data.get(interface)[0]).address
+        cidr_suffix = ipaddress.IPv4Network('{0}/{1}'.format(address, raw_interface_data.get(interface)[0].netmask),
+                                            strict=False).prefixlen
+        if ':' not in address and address != '127.0.0.1':
+            interface_data.append(InterfaceInfo(interface, '{0}/{1}'.format(address, cidr_suffix)))
+    return interface_data
+
+
+def get_ips_from_network(network):
+    network_split = network.split('/')
+    address = network_split[0]
+    cidr = int(network_split[1])
+    all_addresses = []
+
+    test_cidr = 32
+    while test_cidr >= cidr:
+        current_addresses = [str(ip) for ip in ipaddress.IPv4Network('{0}/{1}'.format(address, test_cidr),
+                                                                     strict=False)]
+        for test_address in current_addresses:
+            if test_address not in all_addresses:
+                all_addresses.append(test_address)
+        test_cidr -= 1
+        print(test_cidr)
+    return all_addresses
+
+
+def check_ip(ip_address):
+    response = request_server_info(ip_address, SERVER_PORT)
+    return response

pynpong/networking/gui.py

@@ -2,11 +2,15 @@
 Starting launcher of the game. This is where you host new games or join other ones.
 """
 import tkinter as tk
+import concurrent.futures
+import pypong.networking.client as client
 
 global running
+global listbox
 
 
 def main():
+    executor = concurrent.futures.ThreadPoolExecutor(max_workers=512)
     """
     Runs the game launcher.
     """
@@ -14,7 +18,7 @@ def main():
     main_window.title('PynPong Launcher')
     main_window.resizable(width=False, height=False)
 
-    main_window.geometry('500x250')
+    main_window.geometry('500x300')
 
     def quit_launcher():
         """
@@ -22,20 +26,77 @@ def main():
         """
         global running
         running = False
+        executor.shutdown(wait=False, cancel_futures=True)
 
-    def get_games():
+    def check_game(*game_ip):
+        game_ip = ''.join(game_ip)
+        result = client.check_ip(game_ip)
+        return result
+
+    def get_games(network):
         """
         Refresh the games list.
         """
+        results = []
         listbox.delete(0, tk.END)
-        listbox.insert(0, 'Searching for games...')
-        # Networking code will go here eventually
+        listbox.insert(0, ' Building IP range...')
+        main_window.update()
+        possible_ips = client.get_ips_from_network(network.get().split(' ')[0])
+        listbox.delete(0, tk.END)
+        listbox.insert(0, 'this might take some time...')
+        listbox.insert(0, 'Refreshing server listing,')
+        main_window.update()
+        # possible_ips = ['192.168.12.19']
+        futures = []
+
+        for ip in possible_ips:
+            if ip == '192.168.12.19':
+                print(ip)
+            future = executor.submit(check_game, ip)
+            futures.append(future)
+
+        game_found = False
+
+        for future in futures:
+            result = future.result()
+            main_window.update()
+            if 'PYPONGRST;SVRINFO' in result:
+                print(result)
+                raw_response = result.split(';')
+                response = []
+                for block in raw_response:
+                    print(block)
+                    chunks = block.split(':')
+                    for chunk in chunks:
+                        response.append(chunk)
+                print(response)
+                if 'NAME' in response:
+                    session_name = response[response.index('NAME') + 1]
+                    if not game_found:
+                        listbox.delete(0, tk.END)
+                    listbox.insert(0, session_name)
+                    game_found = True
+                    main_window.update()
+
+        if not game_found:
+            listbox.delete(0, tk.END)
+            listbox.insert(0, 'No games found!')
+
+    def get_addresses():
+        interface_info = client.get_interface_info()
+        shortened_info = []
+
+        for interface in interface_info:
+            shortened_info.append('{0} [{1}]'.format(interface.network, interface.interface_name))
+
+        return shortened_info
 
     # Create the top title label
     title_label = tk.Label(text='PynPong Launcher', fg='white', bg='#000040', padx=1, pady=20)
     title_label.pack(side=tk.TOP, fill=tk.BOTH)
 
     # Create the list of games
+    global listbox
     listbox = tk.Listbox(main_window)
     listbox.pack(side=tk.LEFT, expand=True, fill=tk.BOTH)
     # Add scrollbar
@@ -49,7 +110,13 @@ def main():
     button_frame = tk.Frame(main_window)
     tk.Button(button_frame, text='Host a Game', height=3, width=30).pack()
     tk.Button(button_frame, text='Join Selected Game', height=3, width=30).pack()
-    tk.Button(button_frame, text='Refresh Game List', height=2, width=20, command=get_games).pack()
+    tk.Button(button_frame, text='Refresh Game List', height=2, width=20,
+              command=lambda: get_games(selected_network)).pack()
+    networks = get_addresses()
+    selected_network = tk.StringVar()
+    selected_network.set(networks[0])
+    interface_menu = tk.OptionMenu(button_frame, selected_network, *networks)
+    interface_menu.pack()
     button_frame.pack(side=tk.RIGHT)
 
     # Set it so that if the X is pressed the application quits