账户订阅和更新

import { subscribe, CommitmentLevel, SubscribeUpdate, LaserstreamConfig } from 'helius-laserstream';
import * as bs58 from 'bs58';

// Utility function to recursively convert Buffer objects to base58 strings
function convertBuffersToBase58(obj: any): any {
  if (obj === null || obj === undefined) {
    return obj;
  }
  
  if (Buffer.isBuffer(obj)) {
    return bs58.encode(obj);
  }
  
  if (Array.isArray(obj)) {
    return obj.map(convertBuffersToBase58);
  }
  
  if (typeof obj === 'object') {
    const result: any = {};
    for (const key in obj) {
      if (obj.hasOwnProperty(key)) {
        result[key] = convertBuffersToBase58(obj[key]);
      }
    }
    return result;
  }
  
  return obj;
}

async function main() {
  console.log('🏦 Basic Account Subscription Example');

  const config: LaserstreamConfig = {
    apiKey: 'your-api-key',
    endpoint: 'laserstream-url',
  };

  const request = {
    accounts: {
      "token-accounts": {
        account: [], // Specific account pubkeys (empty = all)
        owner: ["TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA"], // Token program
        filters: [
          {
            // Only token accounts (165 bytes)
            datasize: 165
          }
        ]
      }
    },
    commitment: CommitmentLevel.CONFIRMED,
    transactions: {}, slots: {}, transactionsStatus: {}, blocks: {}, blocksMeta: {}, entry: {}, accountsDataSlice: []
  };

  const stream = await subscribe(
    config,
    request,
    async (update: SubscribeUpdate) => {
      const readableUpdate = convertBuffersToBase58(update);
      console.log('🏦 Account Update:', JSON.stringify(readableUpdate, null, 2));
    },
    async (err) => console.error('❌ Stream error:', err)
  );

  console.log(`✅ Account subscription started (id: ${stream.id})`);

  process.on('SIGINT', () => {
    console.log('\n🛑 Cancelling stream...');
    stream.cancel();
    process.exit(0);
  });
}

main().catch(console.error);

import { subscribe, CommitmentLevel, SubscribeUpdate, LaserstreamConfig } from 'helius-laserstream';
import * as bs58 from 'bs58';

async function main() {
  console.log('USDC Account Monitor');

  const config: LaserstreamConfig = {
    apiKey: 'your-api-key',
    endpoint: 'laserstream-url',
  };

  const USDC_MINT = "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v";

  const request = {
    accounts: {
      "usdc-accounts": {
        account: [],
        owner: ["TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA"],
        filters: [
          { datasize: 165 },                           // Standard token accounts
          { memcmp: { offset: 0, base58: USDC_MINT } } // Only USDC
        ]
      }
    },
    commitment: CommitmentLevel.CONFIRMED,
    transactions: {}, slots: {}, transactionsStatus: {}, blocks: {}, blocksMeta: {}, entry: {}, accountsDataSlice: []
  };

  const stream = await subscribe(
    config,
    request,
    async (update: SubscribeUpdate) => {
      explainAccountUpdate(update);
    },
    async (err) => console.error('Stream error:', err)
  );

  console.log(`Account monitor started (id: ${stream.id})`);

  process.on('SIGINT', () => {
    console.log('\nCancelling stream...');
    stream.cancel();
    process.exit(0);
  });
}

function explainAccountUpdate(update: SubscribeUpdate) {
  if (!update.account) return;
  
  const account = update.account.account;
  
  // Decode the key addresses
  const tokenAccountAddress = bs58.encode(account.pubkey);
  const transactionSignature = account.txnSignature ? bs58.encode(account.txnSignature) : 'Unknown';
  
  // Extract and decode the token account data (165 bytes)
  const walletOwner = bs58.encode(account.data.slice(32, 64));       // Bytes 32-63: Owner
  const tokenAmount = account.data.readBigUInt64LE(64);              // Bytes 64-71: Amount
  const usdcAmount = Number(tokenAmount) / 1_000_000;                // Convert to USDC (6 decimals)
  
  console.log(`Account: ${tokenAccountAddress}`);
  console.log(`Owner: ${walletOwner}`);
  console.log(`Balance: ${usdcAmount.toLocaleString()} USDC`);
  console.log(`Slot: ${update.account.slot}`);
  console.log(`Transaction: ${transactionSignature.slice(0, 8)}...`);
  console.log('---');
}

main().catch(console.error);