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In this tutorial, we'll explore how to create an asynchronous TCP server in Python using the asyncio library and demonstrate how to handle persistent connections without closing them immediately after data exchange. This can be useful in scenarios where maintaining a connection for an extended period is desirable, such as in a chat application or real-time data streaming.
Make sure you have Python 3.7 or later installed on your system.
Create a new Python script (e.g., async_tcp_server.py) and follow these steps:
In the code above, we define a coroutine handle_client to handle communication with each connected client. The main coroutine sets up the TCP server using asyncio.start_server. The server listens on 127.0.0.1 (localhost) and port 8888.
Replace the placeholder in handle_client with the following code:
In this function, we continuously read data from the client using reader.read. If the received data is empty, it means the client has closed the connection, and we break out of the loop. Otherwise, we process the received message, send a response back, and repeat the process.
Execute the script:
Your asynchronous TCP server is now running and waiting for connections on 127.0.0.1:8888.
Now, let's create a simple client script to connect to the server and exchange messages.
This client script connects to the server, sends a message, receives a response, and then closes the connection. Notice that we close the connection explicitly in this script.
Execute the client script:
Observe the server console to see the communication and connections being handled. The server does not close the connection immediately after data exchange; it waits for the client to close the connection.
This tutorial provides a basic foundation for an asynchronous TCP server with persistent connections. Depending on your specific use case, you may need to implement additional features, error handling, and security measures.
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