What other solution would you want? You could use `SetDeadline` if you like. But closing the connection seems reasonable too.
I think you're framing the problem wrong. You're not asking to shutdown a goroutine, you're asking "How do I abort from a synchronous read from a network connection that is blocked?"
Don't get too hung up on that, it was the least of the problems. Closing the connection works fine, it's just a bit unorthodox. The basic structure of the problem was much more problematic to implement.
The best solution that I've found is to just close the connection, the .Recv() will error out immediately.