How Can I Reliably Detect TCP Connection Closure in Go?

Detecting TCP Connection Closure in Go's net Package

When implementing a TCP server, monitoring client connections is crucial. To determine whether a client has closed the connection, it's important to avoid solely relying on read/write operations. Instead, a comprehensive approach is recommended.

Preferred Method:

The thread "Best way to reliably detect that a TCP connection is closed," suggests using a combination of SetReadDeadline() and Read() functions:

one := make([]byte, 1)
c.SetReadDeadline(time.Now())
if _, err := c.Read(one); err == io.EOF {
  // Client has closed the connection
  c.Close()
  c = nil
} else {
  c.SetReadDeadline(time.Now().Add(10 * time.Millisecond))
}

By setting a timeout on the read operation, you can determine whether the connection is closed based on the io.EOF error.

Timeout Detection:

In case you encounter a timeout during the read operation, the Go documentation provides guidance:

if neterr, ok := err.(net.Error); ok && neterr.Timeout() {
  // Handle timeout
}

Updates in Go 1.7 :

It's worth noting that in Go versions 1.7 and above, zero-byte reads return immediately without an error. Therefore, ensuring that at least one byte is read is crucial.

In conclusion, a robust approach involving SetReadDeadline(), Read() and handlingtimeouts allows you to reliably detect TCP connection closures in Go's net package.

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