pseudo code

jobs.ts

interface Job {
  path: string,
  try: number // intially 0
}

const pool = someWorkersPoolLibrary()

const Q = downloadAllRules()
while(Q.length || pool.pendingJobs) {
  const currentJob = Q.unshift()
  currentJob.try++
  pool.run('runRule', job).then(() => {
    // rule finished running, we might report a rule error etc in this phase
  }).catch(e => {
      if (currentJob.try < 3)
        Q.push(currentJob)
  }) ;
}