function withinCooldownPeriod()

in src/scaler/scaler-core/index.js [191:265]
70 lines of code
8 McCabe index (conditional complexity)

function withinCooldownPeriod(cluster, suggestedSize, autoscalerState, now) {
  const MS_IN_1_MIN = 60000;
  const scaleOutSuggested = suggestedSize - cluster.currentSize > 0;
  let cooldownPeriodOver;

  logger.debug({
    message: `-----  ${cluster.projectId}/${cluster.clusterId}: Verifying if scaling is allowed -----`,
    projectId: cluster.projectId,
    regionId: cluster.regionId,
    clusterId: cluster.clusterId,
  });

  const lastScalingMillisec = autoscalerState.lastScalingCompleteTimestamp
    ? autoscalerState.lastScalingCompleteTimestamp
    : autoscalerState.lastScalingTimestamp;

  const operation = scaleOutSuggested
    ? {
        description: 'scale out',
        lastScalingMillisec: lastScalingMillisec,
        coolingMillisec: cluster.scaleOutCoolingMinutes * MS_IN_1_MIN,
      }
    : {
        description: 'scale in',
        lastScalingMillisec: lastScalingMillisec,
        coolingMillisec: cluster.scaleInCoolingMinutes * MS_IN_1_MIN,
      };

  if (operation.lastScalingMillisec == 0) {
    cooldownPeriodOver = true;
    logger.debug({
      message: `\tNo previous scaling operation found for this cluster`,
      projectId: cluster.projectId,
      regionId: cluster.regionId,
      clusterId: cluster.clusterId,
    });
  } else {
    const elapsedMillisec = now - operation.lastScalingMillisec;
    cooldownPeriodOver = elapsedMillisec >= operation.coolingMillisec;
    logger.debug({
      message: `\tLast scaling operation was ${convertMillisecToHumanReadable(
        now - operation.lastScalingMillisec,
      )} ago.`,
      projectId: cluster.projectId,
      regionId: cluster.regionId,
      clusterId: cluster.clusterId,
    });
    logger.debug({
      message: `\tCooldown period for ${operation.description} is ${convertMillisecToHumanReadable(
        operation.coolingMillisec,
      )}.`,
      projectId: cluster.projectId,
      regionId: cluster.regionId,
      clusterId: cluster.clusterId,
    });
  }

  if (cooldownPeriodOver) {
    logger.info({
      message: `\t=> Autoscale allowed`,
      projectId: cluster.projectId,
      regionId: cluster.regionId,
      clusterId: cluster.clusterId,
    });
    return false;
  } else {
    logger.info({
      message: `\t=> Autoscale NOT allowed yet`,
      projectId: cluster.projectId,
      regionId: cluster.regionId,
      clusterId: cluster.clusterId,
    });
    return true;
  }
}