Idea: item query helper storage helper

[orkunkl]

Background

Cross contract configuration Item queries is a common execution. This is usually done using SmartQuery which costs quite gas for retrieving simple object from storage. Instead RawQuery can be used for lower costs.

Proposal

Develop new generic storage helper that generates raw query wrapper for given data struct.

Usage example

On source contract

pub const CONTRACT_CONFIG: CONFIG<State> = CONFIG::new("config");

On external contract

let EXT_CONFIG = CONTRACT_CONFIG::query(&deps.querier, external_contract_addr)?;

CONTRACT_CONFIG::query(&deps.querier, external_contract_addr)
raw query with config key internally, and parses State struct.

Please look at cw4 helpers.rs for member query to see an example of reading remote state with raw query https://github.com/CosmWasm/cw-plus/blob/main/packages/cw4/src/helpers.rs#L87-L112