fix: It's best to call SetDeadline before write.

[mty2015]

When session.Kick is called, it directly calls the Agent.Kick method. However, Agent.Kick does not set a writeTimeout when writing the Kick Packet using the underlying conn. This can cause the method to return an I/O timeout in some scenarios. For example, the code here also sets a timeout parameter, which will affect the write behavior during Kick.

func (a *agentImpl) writeToConnection(ctx context.Context, data []byte) error {
	span := createConnectionSpan(ctx, a.conn, "conn write")

	a.conn.SetWriteDeadline(time.Now().Add(a.writeTimeout))
	_, writeErr := a.conn.Write(data)

	if span != nil {
		defer span.End()

		if writeErr != nil {
			span.RecordError(writeErr)
			span.SetStatus(codes.Error, writeErr.Error())
		}
	}

	return writeErr
}

https://github.com/topfreegames/pitaya/blob/main/pkg/agent/agent.go#L566