通过HTTP回调进行异步RPC

Question

I am in the process of designing an SDK (in Golang) with blocking functionality, which should be run asynchronously with the result being returned via a callback.

I have been playing with the Gorilla Toolkit RPC library which is great but I don't see a way of returning values of async calls.

Perhaps I am missing something and the RPC model does not support async calls, by that I mean all calls are blocking, even for a long time. If that is the case, i'm assuming there is no HTTP timeout then?

How can I implement async RPC calls with a return value being returned via a callback.

For clarification: I cannot use the typical Go Channel method for callbacks as I will be calling the RPC from another language over HTTP. So my question is, is there a way to implement callbacks over HTTP when doing RPC or should the calls just block, even for a long time until a value is ready to be returned?

Answer 1

I don't know about Gorilla, but in the net/rpc package of the standard library of Go you'll find this method net/rpc/Go. It makes a RPC call asynchronously, you give it a channel as parameter so you can retrieve the RPC reply when the Remote Procedure Call is finished.

net/rpc/Call also makes a RPC call but it is blocking until the call is finished. If you know how to use channels I'm sure you'll get what you want with the Go method.