3.1 - Implement remote access to Zebra's ReadStateService in Zaino

[idky137]

Currently Zebra's ReadStateService only enables direct access to chain data (both Zebra and any process interfacing with the ReadStateService must be running on the same hardware). Zaino will extend this functionality, using a Hyper wrapper, to allow Zebra and Zaino (or software built using Zaino's IndexerStateService as its backend) to run on different hardware and should enable a much greater range of deployment strategies (eg. running validator, indexer or wallet processes on separate hardware).

It should be noted that this will primarily be designed as a remote link between Zebra and Zaino and it is not intended for developers to directly interface with this service, but instead to use functionality exposed by the client library in Zaino (IndexerStateService).

Implementation details have not yet been finalised and need to be discussed with ECC / ZF. A final spec will be produced in milestone 2 (#57).

Tasks

• Task 3.1.1: Implement RemoteReadStateService using a Hyper wrapper.
• Task 3.1.2: Implement configuration options in Zaino.