solana-dex-parser/src/parsers/meteora/liquidity-meteora-dlmm.ts

Solana Dex Transaction Parser

import { DISCRIMINATORS, TOKENS } from '../../constants';
import { PoolEvent, PoolEventType, TransferData } from '../../types';
import { MeteoraLiquidityParserBase } from './parser-meteora-liquidity-base';

export class MeteoraDLMMPoolParser extends MeteoraLiquidityParserBase {
  public getPoolAction(data: Buffer): { name: string; type: PoolEventType } | null {
    const instructionType = data.slice(0, 8);

    for (const [name, discriminator] of Object.entries(DISCRIMINATORS.METEORA_DLMM.ADD_LIQUIDITY)) {
      if (instructionType.equals(discriminator)) {
        return { name, type: 'ADD' };
      }
    }

    for (const [name, discriminator] of Object.entries(DISCRIMINATORS.METEORA_DLMM.REMOVE_LIQUIDITY)) {
      if (instructionType.equals(discriminator)) {
        return { name, type: 'REMOVE' };
      }
    }

    return null;
  }

  protected parseAddLiquidityEvent(
    instruction: any,
    index: number,
    data: Buffer,
    transfers: TransferData[]
  ): PoolEvent {
    const [token0, token1] = this.normalizeTokens(transfers);
    const programId = this.adapter.getInstructionProgramId(instruction);
    const accounts = this.adapter.getInstructionAccounts(instruction);
    return {
      ...this.adapter.getPoolEventBase('ADD', programId),
      idx: index.toString(),
      poolId: accounts[1],
      poolLpMint: accounts[1],
      token0Mint: token0?.info.mint,
      token1Mint: token1?.info.mint,
      token0Amount: token0?.info.tokenAmount.uiAmount || 0,
      token0AmountRaw: token0?.info.tokenAmount.amount,
      token1Amount: token1?.info.tokenAmount.uiAmount || 0,
      token1AmountRaw: token1?.info.tokenAmount.amount,
      token0Decimals: token0 && this.adapter.getTokenDecimals(token0?.info.mint),
      token1Decimals: token1 && this.adapter.getTokenDecimals(token1?.info.mint),
    };
  }

  protected parseRemoveLiquidityEvent(
    instruction: any,
    index: number,
    data: Buffer,
    transfers: TransferData[]
  ): PoolEvent {
    const accounts = this.adapter.getInstructionAccounts(instruction);
    let [token0, token1] = this.normalizeTokens(transfers);

    if (token1 == undefined && token0?.info.mint == accounts[8]) {
      token1 = token0;
      token0 = undefined;
    } else if (token0 == undefined && token1?.info.mint == accounts[7]) {
      token0 = token1;
      token1 = undefined;
    }
    const token0Mint = token0?.info.mint || accounts[7];
    const token1Mint = token1?.info.mint || accounts[8];
    const programId = this.adapter.getInstructionProgramId(instruction);
    return {
      ...this.adapter.getPoolEventBase('REMOVE', programId),
      idx: index.toString(),
      poolId: accounts[1],
      poolLpMint: accounts[1],
      token0Mint: token0?.info.mint || accounts[7],
      token1Mint: token1?.info.mint || accounts[8],
      token0Amount: token0?.info.tokenAmount.uiAmount || 0,
      token0AmountRaw: token0?.info.tokenAmount.amount,
      token1Amount: token1?.info.tokenAmount.uiAmount || 0,
      token1AmountRaw: token1?.info.tokenAmount.amount,
      token0Decimals: this.adapter.getTokenDecimals(token0Mint),
      token1Decimals: this.adapter.getTokenDecimals(token1Mint),
    };
  }

  private normalizeTokens(transfers: TransferData[]): [TransferData | undefined, TransferData | undefined] {
    let [token0, token1] = this.utils.getLPTransfers(transfers);
    if (transfers.length === 1 && transfers[0].info.mint == TOKENS.SOL) {
      token1 = transfers[0];
      token0 = null as unknown as TransferData;
    }
    return [token0, token1];
  }
}