我有一个客户端连接到服务器并发送列表的所有消息，并且每个消息都被发送，它将从列表中删除。
但是当我强制关闭服务器时，客户端仍然继续发送和删除列表中的消息。我希望如果连接断开，客户端停止发送消息，或者如果无法保证服务器已收到消息，则不从列表中删除。
我检查一下，当我在连接断开后发送了四条以上的消息时，显示错误“socket.send（）引发异常”。但我不知道如何得到这个错误，我认为它是异步的。无论如何，如果我收到该错误，如果列表在连接断开后发送的消息少于五条，则不会发生错误。
Ps：我只为我的测试编写了服务器，但服务器我将无法访问。因此，客户需要尽一切努力保证数据的发送。
非常感谢你。
import asyncio
class Client(asyncio.Protocol):
TIMEOUT = 1.0
event_list = []
for i in range(10):
event_list.append('msg' + str(i))
def __init__(self):
self.client_tcp_timeout = None
print(self.event_list)
def connection_made(self, transport):
print('Connected to Server.')
self.transport = transport
self.client_tcp_timeout = loop.call_later(self.TIMEOUT, self.send_from_call_later)
def data_received(self, data):
self.data = format(data.decode())
print('data received: {}'.format(data.decode()))
def send_from_call_later(self):
self.msg = self.event_list[0].encode()
self.transport.write(self.msg)
print('data sent: {}'.format(self.msg))
print('Removing data: {}'.format(self.event_list[0]))
del self.event_list[0]
print(self.event_list)
print('-----------------------------------------')
if len(self.event_list) > 0:
self.client_tcp_timeout = loop.call_later(self.TIMEOUT, self.send_from_call_later)
else:
print('All list was sent to the server.')
def connection_lost(self, exc):
print('Connection lost!!!!!!.')
loop = asyncio.get_event_loop()
coro = loop.create_connection(Client, 'localhost', 8000)
client = loop.run_until_complete(coro)
loop.run_forever()
import asyncio
class Server(asyncio.Protocol):
def connection_made(self, transport):
peername = transport.get_extra_info('peername')
print('connection from {}'.format(peername))
self.transport = transport
def data_received(self, data):
print('data received: {}'.format(data.decode()))
#self.transport.write(data)
loop = asyncio.get_event_loop()
coro = loop.create_server(Server, 'localhost', 8000)
server = loop.run_until_complete(coro)
print('serving on {}'.format(server.sockets[0].getsockname()))
try:
loop.run_forever()
except KeyboardInterrupt:
print("exit")
finally:
server.close()
loop.close()
$ python3 server.py
serving on ('127.0.0.1', 8000)
connection from ('127.0.0.1', 56119)
data received: msg0
data received: msg1
data received: msg2
data received: msg3
data received: msg4
^Cexit
$ python3 client.py
['msg0', 'msg1', 'msg2', 'msg3', 'msg4', 'msg5', 'msg6', 'msg7', 'msg8', 'msg9']
Connected to Server.
data sent: b'msg0'
Removing data: msg0
['msg1', 'msg2', 'msg3', 'msg4', 'msg5', 'msg6', 'msg7', 'msg8', 'msg9']
-----------------------------------------
data sent: b'msg1'
Removing data: msg1
['msg2', 'msg3', 'msg4', 'msg5', 'msg6', 'msg7', 'msg8', 'msg9']
-----------------------------------------
data sent: b'msg2'
Removing data: msg2
['msg3', 'msg4', 'msg5', 'msg6', 'msg7', 'msg8', 'msg9']
-----------------------------------------
data sent: b'msg3'
Removing data: msg3
['msg4', 'msg5', 'msg6', 'msg7', 'msg8', 'msg9']
-----------------------------------------
data sent: b'msg4'
Removing data: msg4
['msg5', 'msg6', 'msg7', 'msg8', 'msg9']
-----------------------------------------
Connection lost!!!!!!.
data sent: b'msg5'
Removing data: msg5
['msg6', 'msg7', 'msg8', 'msg9']
-----------------------------------------
data sent: b'msg6'
Removing data: msg6
['msg7', 'msg8', 'msg9']
-----------------------------------------
data sent: b'msg7'
Removing data: msg7
['msg8', 'msg9']
-----------------------------------------
data sent: b'msg8'
Removing data: msg8
['msg9']
-----------------------------------------
socket.send() raised exception.
data sent: b'msg9'
Removing data: msg9
[]
-----------------------------------------
All list was sent to the server.
答案 0 :(得分：3)
写入TCP套接字并不能保证收到数据。它只将数据发送到OS内核，然后OS内核尽可能地将数据发送到另一方。但是，一旦将数据发送到OS内核，写调用就会返回成功。如果数据随后被对等OS内核接收，它将在TCP级别确认它们。但是，这只意味着数据是由内核接收的，而不是由应用程序处理它们。
如果您希望保证消息传递并处理对等体的可能关闭，则必须在协议中实现某种确认，并且只有在成功处理后才能从对等应用程序获得明确确认后才删除数据数据
答案 1 :(得分：1)
我希望如果连接断开，客户端停止发送消息，或者如果不保证服务器已收到消息，则不从列表中删除。
所以编写代码来做到这一点。在服务器指示已收到消息之前，请勿删除该消息。您可以按照自己喜欢的方式实现此功能，但如果这是您想要的行为，则必须对其进行编码。