eth_getFilterLogs - Mantle RPC Method

async function backfillEvents(provider, contractAddress, topics, lastProcessedBlock) {
  const currentBlock = await provider.getBlockNumber();

  // Create a filter covering the gap
  const filterId = await provider.send('eth_newFilter', [{
    fromBlock: '0x' + (lastProcessedBlock + 1).toString(16),
    toBlock: '0x' + currentBlock.toString(16),
    address: contractAddress,
    topics: topics
  }]);

  // Retrieve all logs in the gap
  const logs = await provider.send('eth_getFilterLogs', [filterId]);
  console.log(`Backfilling ${logs.length} events from blocks ${lastProcessedBlock + 1} to ${currentBlock}`);

  for (const log of logs) {
    await processEvent(log);
  }

  // Clean up and switch to incremental polling
  await provider.send('eth_uninstallFilter', [filterId]);
  return currentBlock;
}

async function verifyFilterResults(provider, filterParams) {
  // Create filter and get logs via eth_getFilterLogs
  const filterId = await provider.send('eth_newFilter', [filterParams]);
  const filterLogs = await provider.send('eth_getFilterLogs', [filterId]);

  // Get logs directly via eth_getLogs
  const directLogs = await provider.send('eth_getLogs', [filterParams]);

  console.log(`Filter logs: ${filterLogs.length}, Direct logs: ${directLogs.length}`);

  if (filterLogs.length !== directLogs.length) {
    console.warn('Mismatch detected — investigate missing events');
  }

  await provider.send('eth_uninstallFilter', [filterId]);
  return { filterLogs, directLogs };
}

async function loadHistoricalEvents(provider, contractAddress, startBlock, endBlock, chunkSize = 2000) {
  const allLogs = [];

  for (let from = startBlock; from <= endBlock; from += chunkSize) {
    const to = Math.min(from + chunkSize - 1, endBlock);

    const filterId = await provider.send('eth_newFilter', [{
      fromBlock: '0x' + from.toString(16),
      toBlock: '0x' + to.toString(16),
      address: contractAddress
    }]);

    const logs = await provider.send('eth_getFilterLogs', [filterId]);
    allLogs.push(...logs);

    console.log(`Blocks ${from}-${to}: ${logs.length} events (total: ${allLogs.length})`);

    await provider.send('eth_uninstallFilter', [filterId]);
  }

  return allLogs;
}

async function safeGetFilterLogs(provider, filterId, maxRetries = 3) {
  for (let i = 0; i < maxRetries; i++) {
    try {
      return await provider.send('eth_getFilterLogs', [filterId]);
    } catch (error) {
      if (error.message.includes('filter not found')) {
        throw new Error('Filter expired — must recreate before retrying');
      }
      if (error.message.includes('more than 10000 results')) {
        throw new Error('Too many results — narrow your block range');
      }
      if (i < maxRetries - 1) {
        const delay = Math.pow(2, i) * 1000;
        await new Promise(r => setTimeout(r, delay));
      } else {
        throw error;
      }
    }
  }
}