How to Detect Closed TCP Connections Using Go's `net` Package?

TCP Connection Closure Detection with net Package

Determining the closure of a TCP connection in the net package is crucial for effective server management. In this article, we'll explore the best practices for detecting closed connections.

Question: How can I detect a closed TCP connection in the net package?

Answer:

To reliably ascertain connection closure, follow the technique outlined in the "Best way to reliably detect that a TCP connection is closed" thread:

1. Create a single-byte buffer: one := make([]byte, 1).
2. Set a short read deadline: c.SetReadDeadline(time.Now()).
3. Attempt to read from the connection: if _, err := c.Read(one); err == io.EOF {.
4. If err is io.EOF, the connection has been closed. Log the closure and close the connection.

Note: Since zero-byte reads return immediately in Go 1.7 , it's essential to read at least one byte to avoid false positives.

Timeout Detection:

To detect timeout conditions, check if the error returned by c.Read is a net.Error: if neterr, ok := err.(net.Error); ok && neterr.Timeout() {. If the timeout has occurred, handle it accordingly.

The above is the detailed content of How to Detect Closed TCP Connections Using Go's `net` Package?. For more information, please follow other related articles on the PHP Chinese website!