solana-sniper-bot/filters/burn.filter.ts

import { Filter, FilterResult } from "./pool-filters";
import { Connection } from "@solana/web3.js";
import { LiquidityPoolKeysV4 } from "@raydium-io/raydium-sdk";
import { logger } from "../helpers";

export class BurnFilter implements Filter {
	private cachedResult: FilterResult | undefined = undefined;

	constructor(private readonly connection: Connection) {}

	async execute(poolKeys: LiquidityPoolKeysV4): Promise<FilterResult> {
		if (this.cachedResult) {
			return this.cachedResult;
		}

		try {
			const amount = await this.connection.getTokenSupply(poolKeys.lpMint, this.connection.commitment);
			const burned = amount.value.uiAmount === 0;
			const result = { ok: burned, message: burned ? undefined : "Burned -> Creator didn't burn LP" };

			if (result.ok) {
				this.cachedResult = result;
			}

			return result;
		} catch (e: any) {
			if (e.code == -32602) {
				return { ok: true };
			}

			logger.error({ mint: poolKeys.baseMint }, `Failed to check if LP is burned`);
		}

		return { ok: false, message: "Failed to check if LP is burned" };
	}
}