envio/src/SafeCheckpointTracking.res.js

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

// Generated by ReScript, PLEASE EDIT WITH CARE
'use strict';


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

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

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

exports.make = make;
exports.getSafeCheckpointId = getSafeCheckpointId;
exports.updateOnNewBatch = updateOnNewBatch;
exports.rollback = rollback;
/* No side effect */