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[英]How do I detect a lost client connection in a server that inherits from pb.Root?
[英]How do I drop a connection if client disconnects from server?
我已經編寫了一個服務器和一個客戶端,如果我關閉客戶端並再次連接,我在服務器上的客戶端列表就會堆積起來。 第一次斷開連接時,我會打印出列表中的內容,因此首先得到以下信息:
{612: <socket.socket fd=612, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('192.168.1.77', 22050), raddr=('192.168.1.77', 53531)>
我第二次連接它只是堆疊起來,所以看起來像這樣:
{612: <socket.socket fd=612, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('192.168.1.77', 22050), raddr=('192.168.1.77', 53531)>, 620: <socket.socket fd=620, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('192.168.1.77', 22050), raddr=('192.168.1.77', 53532)>}
我該如何做才能使它斷開連接? 這是服務器代碼:
import socket
import threading
from _thread import *
from threading import Thread
clients = {}
def message(c):
while True:
try:
data = c.recv(1024).decode("utf-8")
print("Recieved from: " + str(data))
if not data:
print("Client Disconnected.")
print(clients)
break
# skicka meddelanden till client
for client in clients.values():
try:
if client == c:
continue
client.sendall(data.encode("utf-8"))
except ConnectionAbortedError:
print("[!] Connection aborted ")
print(str(clients))
except ConnectionResetError:
print("[!] Connection reset error ")
print(str(clients))
except ConnectionResetError:
print("[!] - An existing connection was forcibly closed by the remote host. \n")
break
def listener():
host = "192.168.1.77"
port = 22050
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((host, port))
s.listen(5)
print("\nServer has started.\n\n" + "Host: " + host + "\nPort: " + str(port))
print("______________________________________________________________________\n")
while True:
c, addr = s.accept()
print(str(addr) + " has connected.")
clients[c.fileno()] = c
threading.Thread(target=message, args=(c,)).start()
if __name__ == '__main__':
listenerthread = Thread(target=listener())
listenerthread.start
#listener()
這是客戶端代碼:
import socket
import os
from multiprocessing import Process
from threading import Thread
import sys
print("... Awaiting connection from server ...")
host = "192.168.1.77"
port = 22050
try:
s = socket.socket()
s.connect((host, port))
except ConnectionRefusedError:
print("Server is down.")
sys.exit()
try:
print("Connected!")
def send():
while True:
message = input("-> ")
s.send(message.encode("utf-8"))
#recieve = s.recv(1024).decode("utf-8")
#print("- Server: " + recieve)
def recv():
recieve = s.recv(1024).decode("utf-8")
print("\n" + "Server: " + recieve)
# while message !="quitclient":
# s.send(message.encode("utf-8"))
# recieve = s.recv(1024).decode("utf-8")
# print("Recieved from server: " + recieve)
# message = input("-> ")
# s.close()
except ConnectionResetError:
print("Disconnected!")
input("Press enter to exit...")
quit()
sendthread = Thread(target=send)
recvthread = Thread(target=recv)
sendthread.start()
recvthread.start()
客戶端代碼只是我擁有的GUI客戶端代碼的cli版本(因為它寫的太久了,所以不再寫),但是它是相同的代碼。 在GUI版本上,我有一個斷開按鈕, 如下所示:
def Disconnect():
s.shutdown(socket.SHUT_RDWR)
s.close()
我在這里做錯了什么?
clients
字典僅添加到,從未刪除。 像下面這樣的東西應該起作用。 捕獲任何異常並退出以從字典中刪除密鑰。
def message(c):
try:
while True:
data = c.recv(1024).decode("utf-8")
print("Received from: " + str(data))
if not data:
print("Client Disconnected.")
print(clients)
break
# skicka meddelanden till client
for client in clients.values():
if client == c:
continue
client.sendall(data.encode("utf-8"))
except Exception as e:
print(e)
clients.pop(c.fileno())
print(clients)
順便說一句,由於需要start()
not start
,下面的代碼從不啟動線程。 偵聽器啟動是因為在target=listener()
調用了該target=listener()
,該target=listener
應為target=listener
:
if __name__ == '__main__':
listenerthread = Thread(target=listener())
listenerthread.start
#listener()
但是不需要啟動線程來調用偵聽器。 只需使用:
if __name__ == '__main__':
listener()
您最終還會遇到消息問題。 TCP是一種流協議,因此您不能假定每個recv
都能接收到send
。 send
不能保證將發送每個字節...檢查返回值或使用sendall
。 緩慢發送的小消息可能永遠不會顯示問題,但發送充滿多字節UTF-8編碼字符的大消息,則會出現錯誤。 請參閱我的最新答案,以簡單的方式解決它。
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