Find an anchor state past a certain L2 block

anchor.ts

import { ethers } from 'ethers';
import { table } from 'table';

const provider = new ethers.JsonRpcProvider(process.env.PROVIDER_URL || 'http://localhost:8545');
const targetBlockNumber = 134010741;
const anchorStateRegistry = '0x1c68ECfbf9C8B1E6C0677965b3B9Ecf9A104305b';

const main = async () => {
  // Setup
  const iface = new ethers.Interface(['event AnchorUpdated(address indexed game)']);
  const gameAbi = ['function l2BlockNumber() view returns (uint256)'];

  // Calculate start block (7 days ago)
  const currentBlock = await provider.getBlockNumber();
  const daysAgo = 7;
  const secondsAgo = daysAgo * 24 * 60 * 60;
  const startBlock = currentBlock - Math.floor(secondsAgo / 12); // Assuming 12 sec per block

  console.log(`Fetching events from block ${startBlock} to ${currentBlock}...`);

  // Fetch logs
  const logs = await provider.getLogs({
    address: anchorStateRegistry,
    topics: [ethers.id('AnchorUpdated(address)')],
    fromBlock: startBlock,
    toBlock: currentBlock
  });

  console.log(`Found ${logs.length} events`);

  // Process logs
  const tableData = [['Block', 'Time', 'Game', 'L2 Block', 'Tx', '?']];
  let targetReached = false;

  for (const log of logs) {
    try {
      const gameAddress = iface.parseLog(log)?.args[0];
      const block = await provider.getBlock(log.blockNumber);
      const timestamp = block?.timestamp
        ? new Date(Number(block.timestamp) * 1000).toISOString().slice(0, 19).replace('T', ' ')
        : 'unknown';

      try {
        const gameContract = new ethers.Contract(gameAddress, gameAbi, provider);
        const l2BlockNumber = await gameContract.l2BlockNumber();
        const status = l2BlockNumber >= targetBlockNumber ? 'X' : '';

        if (l2BlockNumber >= targetBlockNumber) targetReached = true;

        tableData.push([
          log.blockNumber.toString(),
          timestamp,
          `${gameAddress.slice(0, 6)}...${gameAddress.slice(-4)}`,
          l2BlockNumber.toString(),
          `${log.transactionHash.slice(0, 6)}...${log.transactionHash.slice(-4)}`,
          status
        ]);
      } catch (e) {
        tableData.push([
          log.blockNumber.toString(),
          timestamp,
          `${gameAddress.slice(0, 6)}...${gameAddress.slice(-4)}`,
          'Error',
          `${log.transactionHash.slice(0, 6)}...${log.transactionHash.slice(-4)}`,
          '❌'
        ]);
      }
    } catch (e) {
      console.error('Error parsing log:', e);
    }
  }

  // Print results
  console.log(table(tableData, {
    columns: {
      0: { alignment: 'right' },
      3: { alignment: 'right' }
    }
  }));

  console.log(targetReached
    ? `\n✅ Found events where L2 block number is >= ${targetBlockNumber}`
    : `\n❌ No events found where L2 block number is >= ${targetBlockNumber}`);
};

main().catch(error => {
  console.error('Error:', error);
  process.exit(1);
});