@stable-io/cctp-sdk-cctpr-evm/dist/contractSdk/layouts/feeAdjustments.js

EVM support for the CCTPR corridor of the CCTP SDK

// Copyright (c) 2025 Stable Technologies Inc
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.
import { amountItem, Usdc } from "@stable-io/cctp-sdk-definitions";
import { paddedSlotItem } from "@stable-io/cctp-sdk-evm";
//stored in cents -> shift down by 2 decimal and read as human
const absoluteUsdcTransform = {
    to: (value) => value / 100,
    from: (human) => Number(human.mul(100).floor()),
};
//negative values mean a discount on relay costs (but gas dropoff is never discounted)
const feeAdjustmentAbsoluteUsdcItem = {
    ...amountItem(2, Usdc, "human", absoluteUsdcTransform),
    binary: "int",
};
//100 means no discount and no risk premium on execution costs
const feeAdjustmentRelativePercentItem = { binary: "uint", size: 1 };
const feeAdjustmentLayout = [
    { name: "absoluteUsdc", ...feeAdjustmentAbsoluteUsdcItem },
    { name: "relativePercent", ...feeAdjustmentRelativePercentItem },
];
//We reverse the order because layout arrays have the opposite indexing order of uint256s that are
//  used as arrays in the contract:
// * layouts are indexed/serialized "left to right" i.e. MSB first, i.e. Aptos is index 0, while
//   Ethereum is index 9
// * uint256s are indexed "right to left" i.e. LSB first, i.e. Ethereum is stored in the least
//   significant bytes of the uint256 which corresponds to index 0
const reverseAdjustments = (fa) => fa.toReversed();
export const feeAdjustmentsPerSlot = 10;
export const feeAdjustmentsSlotItem = {
    binary: "bytes",
    layout: paddedSlotItem({
        binary: "array",
        length: feeAdjustmentsPerSlot,
        layout: feeAdjustmentLayout,
    }),
    custom: { to: reverseAdjustments, from: reverseAdjustments },
};
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