Giám sát slot & khối bằng LaserStream

import { subscribe, CommitmentLevel, LaserstreamConfig, SubscribeRequest } from 'helius-laserstream';

let lastSlot = 0;
let lastTimestamp = Date.now();
const slotTimes: number[] = [];

// CommitmentLevel only ships the forward (name → number) mapping, so we keep
// a small reverse lookup for the numeric status the SDK returns on slot updates.
const STATUS_NAMES = ['PROCESSED', 'CONFIRMED', 'FINALIZED'] as const;

async function monitorNetworkHealth() {
  const subscriptionRequest: SubscribeRequest = {
    slots: {
      slotSubscribe: {
        filterByCommitment: true // Track processed commitment levels
      }
    },
    commitment: CommitmentLevel.PROCESSED,
    accounts: {}, transactions: {}, transactionsStatus: {},
    blocks: {}, blocksMeta: {}, entry: {}, accountsDataSlice: [],
  };

  const config: LaserstreamConfig = {
    apiKey: 'YOUR_API_KEY',
    endpoint: 'https://laserstream-mainnet-ewr.helius-rpc.com',
  };

  await subscribe(config, subscriptionRequest, async (data) => {
    if (!data.slot) return;
    const slot = data.slot;
    // The SDK returns u64 fields as strings to preserve precision.
    const currentSlot = Number(slot.slot);
    const currentTime = Date.now();

    console.log(`\n📊 Slot Update:`);
    console.log(`  Slot: ${currentSlot}`);
    console.log(`  Parent: ${slot.parent}`);
    // slot.status is a numeric enum (0=processed, 1=confirmed, 2=finalized).
    console.log(`  Status: ${STATUS_NAMES[slot.status] ?? slot.status}`);

    if (lastSlot > 0) {
      const slotDiff = currentSlot - lastSlot;
      const timeDiff = currentTime - lastTimestamp;

      if (slotDiff === 1) {
        slotTimes.push(timeDiff);
        if (slotTimes.length > 100) slotTimes.shift();

        const avg = slotTimes.reduce((a, b) => a + b, 0) / slotTimes.length;
        console.log(`  Slot Time: ${timeDiff}ms`);
        console.log(`  Avg Slot Time: ${avg.toFixed(1)}ms`);

        if (timeDiff > 800) {
          console.log(`  ⚠️  SLOW SLOT: ${timeDiff}ms (normal ~400ms)`);
        }
      } else if (slotDiff > 1) {
        console.log(`  ⚠️  SKIPPED ${slotDiff - 1} SLOTS`);
      }
    }

    lastSlot = currentSlot;
    lastTimestamp = currentTime;
  }, async (error) => {
    console.error('Stream error:', error);
  });
}

monitorNetworkHealth().catch(console.error);

async function monitorBlockProduction() {
  const subscriptionRequest: SubscribeRequest = {
    blocksMeta: {
      blockMetaSubscribe: {}
    },
    commitment: CommitmentLevel.CONFIRMED,
    accounts: {}, transactions: {}, transactionsStatus: {},
    slots: {}, blocks: {}, entry: {}, accountsDataSlice: [],
  };

  const config: LaserstreamConfig = {
    apiKey: 'YOUR_API_KEY',
    endpoint: 'https://laserstream-mainnet-ewr.helius-rpc.com',
  };

  await subscribe(config, subscriptionRequest, async (data) => {
    if (!data.blockMeta) return;
    const blockMeta = data.blockMeta;

    console.log(`\n🧱 Block Produced:`);
    console.log(`  Slot: ${blockMeta.slot}`);
    // blockHeight is a wrapper object: { blockHeight: '397657352' }
    console.log(`  Block Height: ${blockMeta.blockHeight?.blockHeight}`);
    console.log(`  Block Hash: ${blockMeta.blockhash}`);
    console.log(`  Parent Slot: ${blockMeta.parentSlot}`);
    console.log(`  Parent Hash: ${blockMeta.parentBlockhash}`);
    console.log(`  Transactions: ${blockMeta.executedTransactionCount}`);
    console.log(`  Entries: ${blockMeta.entriesCount}`);
    if (blockMeta.blockTime?.timestamp) {
      // blockTime.timestamp is a u64 as a string (Unix seconds).
      console.log(`  Block Time: ${new Date(Number(blockMeta.blockTime.timestamp) * 1000).toISOString()}`);
    }

    // rewards is a wrapper object: { rewards: [...], numPartitions: number | null }
    if (blockMeta.rewards?.rewards?.length > 0) {
      console.log(`  Rewards:`);
      blockMeta.rewards.rewards.forEach((r: any) => {
        console.log(`    ${r.pubkey}: ${r.lamports} lamports (${r.rewardType})`);
      });
    }

    if (Number(blockMeta.executedTransactionCount) > 3000) {
      console.log(`  🔥 HIGH ACTIVITY: ${blockMeta.executedTransactionCount} transactions`);
    }
  }, async (error) => {
    console.error('Stream error:', error);
  });
}

async function monitorDEXBlocks() {
  const subscriptionRequest: SubscribeRequest = {
    blocks: {
      blockSubscribe: {
        accountInclude: [
          "675kPX9MHTjS2zt1qfr1NYHuzeLXfQM9H24wFSUt1Mp8", // Raydium
          "CAMMCzo5YL8w4VFF8KVHrK22GGUsp5VTaW7grrKgrWqK", // Raydium CLMM
          "JUP6LkbZbjS1jKKwapdHNy74zcZ3tLUZoi5QNyVTaV4"   // Jupiter
        ],
        includeTransactions: true,
        includeAccounts: false,
        includeEntries: false
      }
    },
    commitment: CommitmentLevel.CONFIRMED,
    accounts: {}, transactions: {}, transactionsStatus: {},
    slots: {}, blocksMeta: {}, entry: {}, accountsDataSlice: [],
  };

  const config: LaserstreamConfig = {
    apiKey: 'YOUR_API_KEY',
    endpoint: 'https://laserstream-mainnet-ewr.helius-rpc.com',
  };

  await subscribe(config, subscriptionRequest, async (data) => {
    if (!data.block) return;
    const block = data.block;

    let successfulDexTx = 0;
    let totalFees = 0; // lamports
    block.transactions?.forEach((tx: any) => {
      if (tx.meta && !tx.meta.err) {
        successfulDexTx++;
        // tx.meta.fee is a u64 string — coerce before adding.
        totalFees += Number(tx.meta.fee ?? 0);
      }
    });

    console.log(`\n🔄 DEX Activity Block:`);
    console.log(`  Slot: ${block.slot}`);
    console.log(`  Block Height: ${block.blockHeight?.blockHeight}`);
    console.log(`  Block Hash: ${block.blockhash}`);
    console.log(`  Total transactions in block: ${block.executedTransactionCount}`);
    console.log(`  Matched DEX transactions: ${block.transactions?.length ?? 0}`);
    console.log(`  Successful DEX transactions: ${successfulDexTx}`);
    if (successfulDexTx > 0) {
      console.log(`  Total Fees: ${(totalFees / 1e9).toFixed(4)} SOL`);
      console.log(`  Avg Fee: ${(totalFees / successfulDexTx / 1e9).toFixed(6)} SOL`);
    }
  }, async (error) => {
    console.error('Stream error:', error);
  });
}