Existing use cases of `pallet_utility::as_derivative` in XCM

soyome · December 1, 2022, 5:51pm

Hey, some implementation details from the Lido on Polkadot and Kusama team:

There are certain use cases of nesting calls we have for liquid staking at Lido on Polkadot and Kusama. For staking via XCM we use three nested calls (RuntimeCall::utility + RuntimeCall::utility + RuntimeCall::Staking or RuntimeCall::xcmPallet).

Here is the full list of calls used:

nominate()
bond()
bondExtra()
unbond()
withdrawUnbonded()
rebond()
chill()
limitedReserveTransferAssets()

mixbytes/lido-dot-ksm/blob/9ffd2e9acfeb2a967173eae8f436400b0f398638/contracts/Controller.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/proxy/utils/Initializable.sol";

import "../interfaces/IRelayEncoder.sol";
import "../interfaces/IxTokens.sol";
import "../interfaces/IXcmTransactor.sol";
import "../interfaces/ILedger.sol";
import "../interfaces/IAuthManager.sol";
import "../interfaces/ILido.sol";
import "./utils/Encoding.sol";


contract Controller is Initializable {
    using Encoding for uint256;

    // Event emitted when weight updated
    event WeightUpdated (

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Abusive nesting usage may be addressed either by whitelisting those calls that are confirmed to be in use by different teams/products or by restricting nesting levels at a certain constant, also confirmed by exact use cases, e.g. five.
Whitelisting as_derivative also helps: Introduce whitelist for Transact and limit UMP processing to 10 messages per block by KiChjang · Pull Request #6280 · paritytech/polkadot · GitHub

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Existing use cases of `pallet_utility::as_derivative` in XCM

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