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x/crypto/ssh: ssh connections and channels should be cancelable #21423

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@glycerine

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@glycerine

When using x/crypto/ssh in a long-running program for communicating with many nodes that may come and go, it is necessary to be able to shutdown started SSH connections and channels cleanly. Currently there are many goroutines leaked.

For example, https://github.com/golang/crypto/blob/master/ssh/connection.go#L79 the DiscardRequests function is launched in its own go routine for each new connection, and there is no way, currently, to shut it down. It thus leaks memory.

Moreover in order to make the internals of the (brilliant, fabulous) ssh library cancellable, each instance of a raw send and receive will need to be put with a select statement that includes a cancellation signal. I suggest implenting cancellation by adding context.CancelFunc and context.Context to the Config structure.

I've made these changes in a branch, here https://github.com/glycerine/crypto/tree/cancelable

These likely are not perfect or to anyone else's taste exactly, but feel free to mold to taste.

@hanwen this may be of interest.

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