mev-inspect/lib/mev/jitSandwiches.js

A JS port of 'mev-inspect-py' optimised for ease of use.

function getJitSandwiches(swaps, deposits, withdrawals) {
    const orderedSwaps = [...swaps];
    orderedSwaps.sort((a, b) => a.event.logIndex - b.event.logIndex);
    const orderedDeposits = [...deposits];
    orderedDeposits.sort((a, b) => a.event.logIndex - b.event.logIndex);
    const reverseOrderedWithdrawals = [...withdrawals];
    reverseOrderedWithdrawals.sort((a, b) => a.event.logIndex - b.event.logIndex);
    const uniswapV3Swaps = orderedSwaps.filter((swap) => swap.contract.protocol.abi === 'UniswapV3');
    const uniswapV3Deposits = orderedDeposits.filter((deposit) => deposit.contract.protocol.abi === 'UniswapV3');
    const uniswapV3Withdrawals = reverseOrderedWithdrawals.filter((withdrawal) => withdrawal.contract.protocol.abi === 'UniswapV3');
    return getUniswapV3Sandwiches(uniswapV3Swaps, uniswapV3Deposits, uniswapV3Withdrawals);
}
function getUniswapV3Sandwiches(swaps, deposits, withdrawals) {
    const sandwiches = [];
    for (const deposit of deposits) {
        for (const withdrawal of withdrawals) {
            if (deposit.transaction.hash === withdrawal.transaction.hash) {
                continue;
            }
            if (deposit.event.logIndex > withdrawal.event.logIndex) {
                continue;
            }
            if (deposit.event.address !== withdrawal.event.address) {
                continue;
            }
            if (deposit.metadata.tickLower !== withdrawal.metadata.tickLower) {
                continue;
            }
            if (deposit.metadata.tickUpper !== withdrawal.metadata.tickUpper) {
                continue;
            }
            const tickLower = deposit.metadata.tickLower;
            const tickUpper = deposit.metadata.tickUpper;
            const sandwiched = swaps.filter((swap) => {
                const tick = swap.metadata.tick;
                return (swap.event.logIndex > deposit.event.logIndex &&
                    swap.event.logIndex < withdrawal.event.logIndex &&
                    swap.transaction.hash !== deposit.transaction.hash &&
                    swap.transaction.hash !== withdrawal.transaction.hash &&
                    swap.event.address === deposit.event.address &&
                    swap.from !== deposit.depositor &&
                    swap.to !== deposit.depositor &&
                    tick >= tickLower &&
                    tick <= tickUpper);
            });
            if (sandwiched.length === 0) {
                continue;
            }
            else {
                const sender = deposit.transaction.from;
                const deltas = deposit.assets.map((asset, index) => {
                    const addedAmount = deposit.amounts[index];
                    const removedAmount = withdrawal.amounts[index];
                    return {
                        asset,
                        amount: removedAmount - addedAmount,
                    };
                });
                sandwiches.push({
                    sandwicher: { sender, beneficiary: withdrawal.withdrawer },
                    deposit,
                    withdrawal,
                    sandwiched,
                    deltas,
                });
                break;
            }
        }
    }
    return sandwiches;
}
export { getJitSandwiches };
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