50cb2f84db
The goals of this change are: 1. Reduce the size/complexity of `control::discovery` in order to ease code reviews. 2. Extract a reusable grpc streaming utility. There are no intended functional changes. `control::discovery::DestinationServiceQuery` is used to track the state of a request (and streaming response) to the destination service. Very little of this logic is specific to the destination service. The `DestinationServiceQuery` and associated `UpdateRx` type have been moved to a new module, `control::remote_stream`, as `Remote` and `Receiver`, respectively. Both of these types are generic over the gRPC message type, so it will be possible to use this utility with additional API endpoints. The `Receiver::poll` implementation has been simplified to be more idiomatic with the rest of our code (namely, using `try_ready!`). |
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