CW20 适配器 - Injective Docs

在本文档中，我们将解释 CW20 适配器合约，该合约允许将 CW-20 代币与 Injective 发行的原生代币（使用 TokenFactory 模块）进行交换，反之亦然。有关 CW-20 适配器 GitHub 仓库，请参阅这里。

背景

CW-20 是 CosmWasm 中可替代代币的规范，大致基于 ERC-20 规范。它允许在 CosmWasm 中创建和处理任意可替代代币，指定创建、铸造、销毁和在账户之间转移这些代币的方法。适配器合约将确保只有授权的源 CW-20 合约可以铸造代币（以避免创建”假冒”代币）。虽然 CW-20 标准相对成熟和完整，但代币完全存在于 CosmWasm 上下文中，并完全由发行合约管理（包括跟踪账户余额）。这意味着它们无法直接与 Injective 的原生模块交互（例如，无法通过 Injective exchange 模块交易它们，或在不涉及发行合约的情况下进行转账）。考虑到上述情况，有必要提供一个解决方案，作为 CW20 和 Injective bank 模块之间的桥梁。合约的工作流程是

注册新的 CW-20 代币
将 X 数量的 CW-20 代币交换为 Y 数量的 TokenFactory 代币（原始 CW-20 代币将由合约持有）
将 Y 数量的 TF 代币交换回 X 数量的 CW-20 代币（CW-20 代币被释放，TokenFactory 代币被销毁）

消息

`RegisterCw20Contract { addr: Addr }`

注册一个新的 CW-20 合约（addr），该合约将由适配器处理，并创建一个格式为 factory/{adapter_contract}/{cw20_contract} 的新 TokenFactory 代币。

ExecuteMsg::RegisterCw20Contract { addr } => execute_register::handle_register_msg(deps, env, info, addr)

pub fn handle_register_msg(
    deps: DepsMut<InjectiveQueryWrapper>,
    env: Env,
    info: MessageInfo,
    addr: Addr,
) -> Result<Response<InjectiveMsgWrapper>, ContractError> {
    if is_contract_registered(&deps, &addr) {
        return Err(ContractError::ContractAlreadyRegistered);
    }
    let required_funds = query_denom_creation_fee(&deps.querier)?;
    if info.funds.len() > required_funds.len() {
        return Err(ContractError::SuperfluousFundsProvided);
    }

    let mut provided_funds = info.funds.iter();

    for required_coin in &required_funds {
        let pf = provided_funds
           .find(|c| -> bool { c.denom == required_coin.denom })
           .ok_or(ContractError::NotEnoughBalanceToPayDenomCreationFee)?;

        match pf.amount.cmp(&required_coin.amount) {
            Ordering::Greater => return Err(ContractError::SuperfluousFundsProvided),
            Ordering::Less => return Err(ContractError::NotEnoughBalanceToPayDenomCreationFee),
            Ordering::Equal => {}
        }
    }

    let create_denom_msg = register_contract_and_get_message(deps, &env, &addr)?;
    Ok(Response::new().add_message(create_denom_msg))
}

`Receive { sender: String, amount: Uint128, msg: Binary }`

Receiver CW-20 接口的实现。

必须仅由 CW-20 合约调用。

ExecuteMsg::Receive { sender, amount, msg: _ } => execute_receive::handle_on_received_cw20_funds_msg(deps, env, info, sender, amount)

pub fn handle_on_received_cw20_funds_msg(
    deps: DepsMut<InjectiveQueryWrapper>,
    env: Env,
    info: MessageInfo,
    recipient: String,
    amount: Uint128,
) -> Result<Response<InjectiveMsgWrapper>, ContractError> {
    if!info.funds.is_empty() {
        return Err(ContractError::SuperfluousFundsProvided);
    }
    let mut response = Response::new();
    let token_contract = info.sender;
    if!is_contract_registered(&deps, &token_contract) {
        ensure_sufficient_create_denom_balance(&deps, &env)?;
        response = response.add_message(register_contract_and_get_message(deps, &env, &token_contract)?);
    }
    let master = env.contract.address;

    let denom = get_denom(&master, &token_contract);
    let coins_to_mint = Coin::new(amount.u128(), denom);
    let mint_tf_tokens_message = create_mint_tokens_msg(master, coins_to_mint, recipient);

    Ok(response.add_message(mint_tf_tokens_message))
}

`RedeemAndTransfer \{ recipient: Option\<String\> \}`

赎回附加的 TokenFactory 代币并将 CW-20 代币转移给接收者。如果未提供接收者，它们将发送给消息发送者。

`RedeemAndSend { recipient: String, submessage: Binary }`

赎回附加的 TokenFactory 代币并将 CW-20 代币发送到接收者合约。调用者可以提供可选的子消息。

ExecuteMsg::RedeemAndTransfer { recipient } => execute_redeem::handle_redeem_msg(deps, env, info, recipient, None)

ExecuteMsg::RedeemAndSend { recipient, submsg } => execute_redeem::handle_redeem_msg(deps, env, info, Some(recipient), Some(submsg))

pub fn handle_redeem_msg(
    deps: DepsMut<InjectiveQueryWrapper>,
    env: Env,
    info: MessageInfo,
    recipient: Option<String>,
    submessage: Option<Binary>,
) -> Result<Response<InjectiveMsgWrapper>, ContractError> {
    let recipient = recipient.unwrap_or_else(|| info.sender.to_string());

    if info.funds.len() > 1 {
        return Err(ContractError::SuperfluousFundsProvided);
    }
    let tokens_to_exchange = info
       .funds
       .iter()
       .find_map(|c| -> Option<AdapterCoin> {
            match AdapterDenom::new(&c.denom) {
                Ok(denom) => Some(AdapterCoin { amount: c.amount, denom }),
                Err(_) => None,
            }
        })
       .ok_or(ContractError::NoRegisteredTokensProvided)?;

    let cw20_addr = tokens_to_exchange.denom.cw20_addr.clone();
    let is_contract_registered = CW20_CONTRACTS.contains(deps.storage, &tokens_to_exchange.denom.cw20_addr);
    if!is_contract_registered {
        return Err(ContractError::NoRegisteredTokensProvided);
    }

    let burn_tf_tokens_message = create_burn_tokens_msg(env.contract.address, tokens_to_exchange.as_coin());

    let cw20_message: WasmMsg = match submessage {
        None => WasmMsg::Execute {
            contract_addr: cw20_addr,
            msg: to_binary(&Cw20ExecuteMsg::Transfer {
                recipient,
                amount: tokens_to_exchange.amount,
            })?,
            funds: vec![],
        },
        Some(msg) => WasmMsg::Execute {
            contract_addr: cw20_addr,
            msg: to_binary(&Cw20ExecuteMsg::Send {
                contract: recipient,
                amount: tokens_to_exchange.amount,
                msg,
            })?,
            funds: vec![],
        },
    };
    Ok(Response::new().add_message(cw20_message).add_message(burn_tf_tokens_message))
}

`UpdateMetadata { addr : Addr}`

将查询 CW-20 地址（如果已注册）的元数据，并将在 bank 模块中调用 setMetadata（使用 TokenFactory 访问方法）。

ExecuteMsg::UpdateMetadata { addr } => execute_metadata::handle_update_metadata(deps, env, addr)

pub fn handle_update_metadata(
    deps: DepsMut<InjectiveQueryWrapper>,
    env: Env,
    cw20_addr: Addr,
) -> Result<Response<InjectiveMsgWrapper>, ContractError> {
    let is_contract_registered = CW20_CONTRACTS.contains(deps.storage, cw20_addr.as_str());
    if!is_contract_registered {
        return Err(ContractError::ContractNotRegistered);
    }
    let token_metadata = fetch_cw20_metadata(&deps, cw20_addr.as_str())?;

    let denom = get_denom(&env.contract.address, &cw20_addr);
    let set_metadata_message = create_set_token_metadata_msg(denom, token_metadata.name, token_metadata.symbol, token_metadata.decimals);

    Ok(Response::new().add_message(set_metadata_message))
}

查询
RegisteredContracts {}
返回已注册的 CW-20 合约列表。

QueryMsg::RegisteredContracts {} => to_binary(&query::registered_contracts(deps)?)

pub fn registered_contracts(deps: Deps<InjectiveQueryWrapper>) -> StdResult<Vec<Addr>> {}

NewDenomFee {}
返回注册新 tokenFactory denom 所需的费用。

QueryMsg::NewDenomFee {} => to_binary(&query::new_denom_fee(deps)?)

pub fn new_denom_fee(deps: Deps<InjectiveQueryWrapper>) -> StdResult<Uint128> {}

INJECTIVE

​背景

​消息

​RegisterCw20Contract { addr: Addr }

​Receive { sender: String, amount: Uint128, msg: Binary }

​RedeemAndTransfer \{ recipient: Option\<String\> \}

​RedeemAndSend { recipient: String, submessage: Binary }

​UpdateMetadata { addr : Addr}

背景

消息

`RegisterCw20Contract { addr: Addr }`

`Receive { sender: String, amount: Uint128, msg: Binary }`

`RedeemAndTransfer \{ recipient: Option\<String\> \}`

`RedeemAndSend { recipient: String, submessage: Binary }`

`UpdateMetadata { addr : Addr}`