[英]python3.5 asyncio Protocol
我想構建一個聊天演示,但是我不能接收發送的服務器端內容,除了第一次啟動之外,有人知道為什么嗎? 來自https://docs.python.org/3.4/library/asyncio-protocol.html#tcp-echo-client-protocol的代碼
Server.py
import asyncio
class EchoServerClientProtocol(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):
message = data.decode()
print('Data received: {!r}'.format(message))
print('Send: {!r}'.format(message))
self.transport.write(data)
loop = asyncio.get_event_loop()
# Each client connection will create a new protocol instance
coro = loop.create_server(EchoServerClientProtocol, '127.0.0.1', 8888)
server = loop.run_until_complete(coro)
# Serve requests until Ctrl+C is pressed
print('Serving on {}'.format(server.sockets[0].getsockname()))
try:
loop.run_forever()
except KeyboardInterrupt:
pass
# Close the server
server.close()
loop.run_until_complete(server.wait_closed())
loop.close()
Client.py
class EchoClientProtocol(asyncio.Protocol):
def __init__(self, message, loop):
self.message = message
self.loop = loop
self.transport = None
def connection_made(self, transport):
self.transport = transport
transport.write(self.message.encode())
print('Data sent: {!r}'.format(self.message))
# while 1:
# message=input('please input the message:')
# transport.write(message.encode())
# print('Data sent: {!r}'.format(message))
def data_received(self, data):
# print('data_received')
print('Data received: {!r}'.format(data.decode()))
while 1:
message = input('please input the message:')
self.transport.write(message.encode())
print('Data sent: {!r}'.format(message))
def connection_lost(self, exc):
print('The server closed the connection')
print('Stop the event loop')
self.loop.stop()
loop = asyncio.get_event_loop()
message = 'Hello World!'
coro = loop.create_connection(lambda: EchoClientProtocol(message, loop),
'127.0.0.1', 8888)
loop.run_until_complete(coro)
loop.run_forever()
loop.close()
結果顯示:無法顯示'接收到的數據:'#####'像'def data_received(self,data)'僅用於任何人有解決方案嗎? [結果] [1] [1]: https : //i.stack.imgur.com/IoqA9.png
您從EchoClientProtocol.data_received()
創建了所謂的阻止函數。 僅當事件循環可以處理時,服務器發出的每個消息才可以將其傳送到EchoClientProtocol.data_received()
中,但阻塞功能阻止了它。
這段代碼
while 1: # More Pythonic way is While True
message = input('please input the message:')
self.transport.write(message.encode())
從用戶那里獲取消息並將其發送到服務器,直到這一刻一切正常。 在下一步中,它將啟動另一個循環,但是代碼永遠不會進入事件循環(因此無法處理傳入的消息)。
您可以像這樣編輯客戶端代碼:
def data_received(self, data):
print('Data received: {!r}'.format(data.decode()))
message = input('please input the message:')
self.transport.write(message.encode())
當您收到Hello World!
時,將首先調用客戶端中的data_received
Hello World!
從服務器(這是Hello World!
從connection_made
發送)。 現在處理如下:
Hello World!
) data_received
上的事件循環
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