@iqai/mcp-bamm/dist/services/withdraw.js

MCP server for bamm (borrow automated market maker)

import { BAMM_ABI } from "../lib/bamm.abi.js";
import { checkTokenBalance, ensureTokenApproval } from "../lib/token-utils.js";
export class WithdrawService {
    walletService;
    constructor(walletService) {
        this.walletService = walletService;
    }
    /**
     * Redeem your BAMM tokens for Fraxswap LP tokens via bamm.redeem(to, bammIn).
     */
    async execute(params) {
        const { bammAddress, amount: bammAmount } = params;
        const publicClient = this.walletService.getPublicClient();
        const walletClient = this.walletService.getWalletClient();
        if (!walletClient || !walletClient.account) {
            throw new Error("Wallet client is not initialized");
        }
        const userAddress = walletClient.account.address;
        const bammAmountWei = BigInt(Math.floor(Number(bammAmount) * 1e18));
        try {
            // 1. Find the BAMM ERC20 token address from bamm.iBammErc20()
            const bammErc20Address = await publicClient.readContract({
                address: bammAddress,
                abi: BAMM_ABI,
                functionName: "iBammErc20",
                args: [],
            });
            // 2. Check user's BAMM token balance
            await checkTokenBalance(bammErc20Address, userAddress, bammAmountWei, publicClient);
            // 3. Approve the BAMM contract if needed
            await ensureTokenApproval(bammErc20Address, bammAddress, bammAmountWei, publicClient, walletClient);
            // 4. Call bamm.redeem(to, bammIn)
            const { request: redeemRequest } = await publicClient.simulateContract({
                address: bammAddress,
                abi: BAMM_ABI,
                functionName: "redeem",
                args: [userAddress, bammAmountWei],
                account: walletClient.account,
            });
            const txHash = await walletClient.writeContract(redeemRequest);
            await publicClient.waitForTransactionReceipt({ hash: txHash });
            return { txHash };
        }
        catch (error) {
            console.error("Error in withdraw service:", error);
            throw error;
        }
    }
}
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