ibc-client-tendermint-cw 包

此包展示了如何重用 ibc-rs 轻客户端作为 CosmWasm 合约，利用 ibc-client-cw 包。

ibc-client-cw 包暴露了重用 ibc-rs 轻客户端所需的类型和特质。值得注意的是，它提供了一个 ClientType 特质，它需要两个关联类型：ClientState 和 ConsensusState。这些类型接受任何实现 ibc-core 包中的 ClientStateExecution 和 ConsensusState 特质的类型。

例如，要重用现有的 ibc-client-tendermint

use ibc_client_cw::api::ClientType;
use ibc_client_tendermint::client_state::ClientState;
use ibc_client_tendermint::consensus_state::ConsensusState;

#[derive(Clone, Debug)]
pub struct TendermintClient;

impl<'a> ClientType<'a> for TendermintClient {
    type ClientState = ClientState;
    type ConsensusState = ConsensusState;
}

一旦实现了 ClientType 特质，就可以使用 ibc-client-cw 包来完成 CosmWasm 合约的入口点。

use cosmwasm_std::{entry_point, Binary, Deps, DepsMut, Env, MessageInfo, Response};
use ibc_client_cw::context::Context;
use ibc_client_cw::types::{ContractError, InstantiateMsg, QueryMsg, SudoMsg};

pub type TendermintContext<'a> = Context<'a, TendermintClient>;

#[entry_point]
pub fn instantiate(
    deps: DepsMut<'_>,
    env: Env,
    _info: MessageInfo,
    msg: InstantiateMsg,
) -> Result<Response, ContractError> {
    let mut ctx = TendermintContext::new_mut(deps, env)?;
    let data = ctx.instantiate(msg)?;
    Ok(Response::default().set_data(data))
}

#[entry_point]
pub fn sudo(deps: DepsMut<'_>, env: Env, msg: SudoMsg) -> Result<Response, ContractError> {
    let mut ctx = TendermintContext::new_mut(deps, env)?;
    let data = ctx.sudo(msg)?;
    Ok(Response::default().set_data(data))
}

#[entry_point]
pub fn query(deps: Deps<'_>, env: Env, msg: QueryMsg) -> Result<Binary, ContractError> {
    let ctx = TendermintContext::new_ref(deps, env)?;
    ctx.query(msg)
}

上述代码片段编译成了一个完整的CosmWasm合约，实现了Tendermint IBC轻客户端。