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' };
  }
}