Toy grpc server and client in Go.
Toy server accepts RPCs with latitude/longitude and returns the 10 nearest Starbucks locations.
go get -u github.com/jamessanford/geoplay
geoplay &
geoplay -client -loc=37.486,-122.232
A letmegrpc HTTP handler is at http://localhost:6796/GeoLookup/Lookup
Prometheus metrics with go-grpc-prometheus support are at http://localhost:6796/metrics
grpc is on port 6797 by default (-grpc.addr flag)
grpc uses x/net/trace by default, check out http://localhost:6796/debug/requests and http://localhost:6796/debug/events after making some RPCs.
grpc reflection is enabled, try grpc_cli:
grpc_cli call localhost:6797 latlonpb.GeoLookup.Lookup 'lat:37.486 lon:-122.232'
Instead of "rolling your own" this way, there are various "microservice helpers", and you probably want to use one or make a standard one for your organization.
The data/locations.json file came from https://github.com/mmcloughlin/starbucks