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October 1, 2023 07:26
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Example of a simple chat room implemented using `asyncio`.
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#!/usr/bin/env python3 | |
import asyncio | |
import sys | |
class ChatServer: | |
def __init__(self, server_name, port, loop): | |
self.server_name = server_name | |
self.connections = {} | |
self.server = loop.run_until_complete( | |
asyncio.start_server( | |
self.accept_connection, "", port, loop=loop)) | |
def broadcast(self, message): | |
for reader, writer in self.connections.values(): | |
writer.write((message + "\n").encode("utf-8")) | |
@asyncio.coroutine | |
def prompt_username(self, reader, writer): | |
while True: | |
writer.write("Enter username: ".encode("utf-8")) | |
data = (yield from reader.readline()).decode("utf-8") | |
if not data: | |
return None | |
username = data.strip() | |
if username and username not in self.connections: | |
self.connections[username] = (reader, writer) | |
return username | |
writer.write("Sorry, that username is taken.\n".encode("utf-8")) | |
@asyncio.coroutine | |
def handle_connection(self, username, reader): | |
while True: | |
data = (yield from reader.readline()).decode("utf-8") | |
if not data: | |
del self.connections[username] | |
return None | |
self.broadcast(username + ": " + data.strip()) | |
@asyncio.coroutine | |
def accept_connection(self, reader, writer): | |
writer.write(("Welcome to " + self.server_name + "\n").encode("utf-8")) | |
username = (yield from self.prompt_username(reader, writer)) | |
if username is not None: | |
self.broadcast("User %r has joined the room" % (username,)) | |
yield from self.handle_connection(username, reader) | |
self.broadcast("User %r has left the room" % (username,)) | |
yield from writer.drain() | |
def main(argv): | |
loop = asyncio.get_event_loop() | |
server = ChatServer("Test Server", 4455, loop) | |
try: | |
loop.run_forever() | |
finally: | |
loop.close() | |
if __name__ == "__main__": | |
sys.exit(main(sys.argv)) |
Very useful thank you.
fr
Why is there no client part? I'm a little confused about how the code works
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Very useful thank you.