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

Solana Dex Transaction Parser

import { PoolEvent, PoolEventType, TransferData } from '../../types';
import { BaseLiquidityParser } from '../base-liquidity-parser';
import { getInstructionData } from '../../utils';

export abstract class MeteoraLiquidityParserBase extends BaseLiquidityParser {
  abstract getPoolAction(data: Buffer): PoolEventType | { name: string; type: PoolEventType } | null;

  public processLiquidity(): PoolEvent[] {
    const events: PoolEvent[] = [];

    this.classifiedInstructions.forEach(({ instruction, programId, outerIndex, innerIndex }) => {
      const event = this.parseInstruction(instruction, programId, outerIndex, innerIndex);
      if (event) {
        events.push(event);
      }
    });

    return events;
  }

  protected parseInstruction(
    instruction: any,
    programId: string,
    outerIndex: number,
    innerIndex?: number
  ): PoolEvent | null {
    try {
      const data = getInstructionData(instruction);
      const action = this.getPoolAction(data);
      if (!action) return null;

      let transfers = this.getTransfersForInstruction(programId, outerIndex, innerIndex);
      if (transfers.length === 0) transfers = this.getTransfersForInstruction(programId, outerIndex, innerIndex ?? 0);
      const type = typeof action === 'string' ? action : action.type;
      switch (type) {
        case 'CREATE':
          return this.parseCreateLiquidityEvent?.(instruction, outerIndex, data, transfers) ?? null;
        case 'ADD':
          return this.parseAddLiquidityEvent(instruction, outerIndex, data, transfers);
        case 'REMOVE':
          return this.parseRemoveLiquidityEvent(instruction, outerIndex, data, transfers);
      }
      return null;
    } catch (error) {
      console.error('parseInstruction error:', error);
      return null;
    }
  }

  protected abstract parseAddLiquidityEvent(
    instruction: any,
    index: number,
    data: Buffer,
    transfers: TransferData[]
  ): PoolEvent;

  protected abstract parseRemoveLiquidityEvent(
    instruction: any,
    index: number,
    data: Buffer,
    transfers: TransferData[]
  ): PoolEvent;

  protected parseCreateLiquidityEvent?(
    instruction: any,
    index: number,
    data: Buffer,
    transfers: TransferData[]
  ): PoolEvent;
}