NewProxyConnections creates a new GRPCClientProxy.

UnaryInterceptor returns the bare grpc.UnaryInterceptor used to route requests to the various nodes.

WithClusterFunk returns server options for Clusterfunk gRPC servers.

LocalShard is a return value to the ShardConversionFunc if you want processing to be on the local node.

ProxyConnections manages grpc.ClientConn connections to proxies.

ShardConversionFunc is the shard conversion function, ie return a shard based on the request parameter to the gRPC server methods.