envio/src/SafeCheckpointTracking.res.mjs

A latency and sync speed optimized, developer friendly blockchain data indexer.

// Generated by ReScript, PLEASE EDIT WITH CARE


function make(maxReorgDepth, shouldRollbackOnReorg, chainReorgCheckpoints) {
  if (!(maxReorgDepth > 0 && shouldRollbackOnReorg)) {
    return;
  }
  let checkpointIds = Array(chainReorgCheckpoints.length);
  let checkpointBlockNumbers = Array(chainReorgCheckpoints.length);
  chainReorgCheckpoints.forEach((checkpoint, idx) => {
    checkpointIds[idx] = checkpoint.id;
    checkpointBlockNumbers[idx] = checkpoint.block_number;
  });
  return {
    checkpointIds: checkpointIds,
    checkpointBlockNumbers: checkpointBlockNumbers,
    maxReorgDepth: maxReorgDepth
  };
}

function getSafeCheckpointId(safeCheckpointTracking, sourceBlockNumber) {
  let safeBlockNumber = sourceBlockNumber - safeCheckpointTracking.maxReorgDepth | 0;
  let match = safeCheckpointTracking.checkpointIds;
  if (match.length === 0) {
    return 0n;
  }
  if (safeCheckpointTracking.checkpointBlockNumbers[0] > safeBlockNumber) {
    return 0n;
  }
  if (match.length === 1) {
    return match[0];
  }
  let trackingCheckpointsCount = safeCheckpointTracking.checkpointIds.length;
  let result;
  let idx = 1;
  while (idx < trackingCheckpointsCount && result === undefined) {
    if (safeCheckpointTracking.checkpointBlockNumbers[idx] > safeBlockNumber) {
      result = safeCheckpointTracking.checkpointIds[idx - 1 | 0];
    }
    idx = idx + 1 | 0;
  };
  let checkpointId = result;
  if (checkpointId !== undefined) {
    return checkpointId;
  } else {
    return safeCheckpointTracking.checkpointIds[trackingCheckpointsCount - 1 | 0];
  }
}

function updateOnNewBatch(safeCheckpointTracking, sourceBlockNumber, chainId, batchCheckpointIds, batchCheckpointBlockNumbers, batchCheckpointChainIds) {
  let safeCheckpointId = getSafeCheckpointId(safeCheckpointTracking, sourceBlockNumber);
  let mutCheckpointIds = [];
  let mutCheckpointBlockNumbers = [];
  for (let idx = 0, idx_finish = safeCheckpointTracking.checkpointIds.length; idx < idx_finish; ++idx) {
    let checkpointId = safeCheckpointTracking.checkpointIds[idx];
    if (checkpointId >= safeCheckpointId) {
      mutCheckpointIds.push(checkpointId);
      mutCheckpointBlockNumbers.push(safeCheckpointTracking.checkpointBlockNumbers[idx]);
    }
  }
  for (let idx$1 = 0, idx_finish$1 = batchCheckpointIds.length; idx$1 < idx_finish$1; ++idx$1) {
    if (batchCheckpointChainIds[idx$1] === chainId) {
      mutCheckpointIds.push(batchCheckpointIds[idx$1]);
      mutCheckpointBlockNumbers.push(batchCheckpointBlockNumbers[idx$1]);
    }
  }
  return {
    checkpointIds: mutCheckpointIds,
    checkpointBlockNumbers: mutCheckpointBlockNumbers,
    maxReorgDepth: safeCheckpointTracking.maxReorgDepth
  };
}

function rollback(safeCheckpointTracking, targetBlockNumber) {
  let mutCheckpointIds = [];
  let mutCheckpointBlockNumbers = [];
  for (let idx = 0, idx_finish = safeCheckpointTracking.checkpointIds.length; idx < idx_finish; ++idx) {
    let blockNumber = safeCheckpointTracking.checkpointBlockNumbers[idx];
    if (blockNumber <= targetBlockNumber) {
      mutCheckpointIds.push(safeCheckpointTracking.checkpointIds[idx]);
      mutCheckpointBlockNumbers.push(safeCheckpointTracking.checkpointBlockNumbers[idx]);
    }
  }
  return {
    checkpointIds: mutCheckpointIds,
    checkpointBlockNumbers: mutCheckpointBlockNumbers,
    maxReorgDepth: safeCheckpointTracking.maxReorgDepth
  };
}

export {
  make,
  getSafeCheckpointId,
  updateOnNewBatch,
  rollback,
}
/* No side effect */