GetReadSource will attempt to unmarshal a ReadSource from the ReadRequest or return an error if no valid resource is present.

HasSingleMeasurementNoOR determines if an index optimisation is available.

NewContextWithRequestOptions returns a new Context with nodeID added.

ReadOptionsFromContext returns the ReadOptions associated with the context or nil if no additional options have been specified.

ReadOptions are additional options that may be passed with context.Context to configure the behavior of a storage read request.