Python TCP Server接受连接和广播命令
我一直在使用多个Raspberry Pi，Python和一些按钮/开关进行游戏。我的游戏需要一个中央服务器，该服务器向多个客户端发出命令。
我不是编程新手，而是Python和较低级网络通信的新手，在过去两天里，我一直迷失在如何精确编写服务器代码方面。
客户端程序是一个简单的socket.connect，然后等待发送数据。那里没有问题。
我很难确定确切的编写方式以及如何使服务器正常工作。
这是我目前的服务器代码：
import socket, time, sysimport threading
TCP_IP = ''
TCP_PORT = 8888
BUFFER_SIZE = 1024
CLIENTS = {}
clientCount = 0
def listener():
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((TCP_IP,TCP_PORT))
s.listen(5)
while True:
conn, addr = s.accept()
print("new connection from:"+ str(addr))
#print(len(CLIENTS))
global clientCount
clientCount = clientCount+1
print (clientCount)
# register client
CLIENTS[conn.fileno()] = conn
def broadcast():
for client in CLIENTS.values():
client.send('this is a broadcats msg')
if __name__ == '__main__':
listener()
while clientCount > 0:
broadcast()
print(len(CLIENTS)) #print out the number of connected clients every 5s
time.sleep(5)
这是所需的流程：1.服务器启动并等待第一个或更多连接。我相信这个“服务器”应该在后台线程上运行吗？2.如果connectionCount >
0启动主程序循环，则3.现在，主程序循环应仅显示已连接客户端的数量，并每5秒向所有客户端广播一条消息。
我有大约5个版本的服务器。我曾尝试过async，select.select和几种线程方法，但无法完全确定我寻求的行为。我应该将服务器置于后台线程中吗？如果是这样，如何广播到所有连接？
我唯一没有尝试过的就是Twisted，那是因为我无法在Windows中安装它……所以我暂时不考虑optino。如果有人在哪里进行指导，我将不胜感激！
好的，根据@Armans的建议，我已经更新了代码，以便有一个服务器类，但它仍然执行相同的操作。
class server(): def __init__(self):
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((TCP_IP,TCP_PORT))
s.listen(10)
while 1:
client_socket, addr = s.accept()
print ('Connected with ' + addr[0] + ':' + str(addr[1]))
global clientCount
clientCount = clientCount+1
print (clientCount)
# register client
CLIENTS[client_socket.fileno()] = client_socket
threading.Thread(target=self.handler, args=(client_socket, addr)).start()
def handler(self, client_socket, addr):
while 1:
data = client_socket.recv(BUFFER_SIZE)
print ('Data : ' + repr(data) + "\n")
data = data.decode("UTF-8")
def broadcast(self, message):
for c in self.CLIENTS:
c.send(message.encode("utf-8"))
if __name__ == '__main__':
s = server() #create new server listening for connections
while clientCount > 0:
s.broadcast('msg here')
print(len(CLIENTS)) #print out the number of connected clients every 5s
time.sleep(5)
我可以连接多个客户端，并且控制台显示以下内容：
Connected with 10.0.0.194:384061
Connected with 10.0.0.169:36460
2
但是“ while clientCount”循环中的代码永远不会运行。这是我被困住一段时间的区域，因此，如果您还有更多想法，我将乐意为您提供任何想法！
回答：
终于成功了！非常感谢@Arman为我指出正确的穿线方向。我终于感觉到我知道一切正常！
这是我完整的服务器和客户端代码。希望这可以通过master> client
setup帮助其他人。_broadcast（）函数正在工作，因为您会看到它现在只广播静态msg，但这应该是一个简单的更新。
如果有人对代码清除有任何建议，请使用该代码作为示例的python最佳实践，我希望听到并了解更多。再次感谢SE！
##Clientimport socket
import sys
import json
#vars
connected = False
#connect to server
client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.connect(('10.0.0.158',8888))
connected = True
while connected == True:
#wait for server commands to do things, now we will just display things
data = client_socket.recv(1024)
cmd = json.loads(data) #we now only expect json
if(cmd['type'] == 'bet'):
bet = cmd['value']
print('betting is: '+bet)
elif (cmd['type'] == 'result'):
print('winner is: '+str(cmd['winner']))
print('payout is: '+str(cmd['payout']))
##Server
import socket, time, sys
import threading
import pprint
TCP_IP = ''
TCP_PORT = 8888
BUFFER_SIZE = 1024
clientCount = 0
class server():
def __init__(self):
self.CLIENTS = []
def startServer(self):
try:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((TCP_IP,TCP_PORT))
s.listen(10)
while 1:
client_socket, addr = s.accept()
print ('Connected with ' + addr[0] + ':' + str(addr[1]))
global clientCount
clientCount = clientCount+1
print (clientCount)
# register client
self.CLIENTS.append(client_socket)
threading.Thread(target=self.playerHandler, args=(client_socket,)).start()
s.close()
except socket.error as msg:
print ('Could Not Start Server Thread. Error Code : ') #+ str(msg[0]) + ' Message ' + msg[1]
sys.exit()
#client handler :one of these loops is running for each thread/player
def playerHandler(self, client_socket):
#send welcome msg to new client
client_socket.send(bytes('{"type": "bet","value": "1"}', 'UTF-8'))
while 1:
data = client_socket.recv(BUFFER_SIZE)
if not data:
break
#print ('Data : ' + repr(data) + "\n")
#data = data.decode("UTF-8")
# broadcast
for client in self.CLIENTS.values():
client.send(data)
# the connection is closed: unregister
self.CLIENTS.remove(client_socket)
#client_socket.close() #do we close the socket when the program ends? or for ea client thead?
def broadcast(self, message):
for c in self.CLIENTS:
c.send(message.encode("utf-8"))
def _broadcast(self):
for sock in self.CLIENTS:
try :
self._send(sock)
except socket.error:
sock.close() # closing the socket connection
self.CLIENTS.remove(sock) # removing the socket from the active connections list
def _send(self, sock):
# Packs the message with 4 leading bytes representing the message length
#msg = struct.pack('>I', len(msg)) + msg
# Sends the packed message
sock.send(bytes('{"type": "bet","value": "1"}', 'UTF-8'))
if __name__ == '__main__':
s = server() #create new server listening for connections
threading.Thread(target=s.startServer).start()
while 1:
s._broadcast()
pprint.pprint(s.CLIENTS)
print(len(s.CLIENTS)) #print out the number of connected clients every 5s
time.sleep(5)
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