Javascript：速率限制但在限制结束时继续执行

Question

I have something like this in Node.js and I'm using the Limiter to limit how many times this function can be executed in a minute. (10 times per min for example)

  this.queue = [];
  this.limiter = new RateLimiter(10, 60000);
  someFunction() {
           for(var element of this.queue) {
                   this.limiter.removeTokens(1, (err, remainingRequests) => {
                         //do something with element in queue and remove it from queue
                    });
            }
  }

Now I want this function to run immediately after something added to the queue, if it hits the limit, it should wait until the tokens reset and then continue executing for the remaining items in the queue. Keep in mind that items can be added to the queue all the time (assume 2 items added to the queue every sec all the time for example ). What is the best way to achieve these results? Is there a better implementation for this or any available packages that would be helpful?

Answer 1

I was able to achieve the desired results using p-queue

this.queue = new PQueue({
  concurrency: 1,
  autoStart: true,
  intervalCap: 10,
  interval: 60000 
});

this.queue.add(() => {
    this.someFunctuon();
});

---

someFunction() will immediately start executing once it is added to the queue. The queue will execute 10 functions every minute. If more functions are added, it will wait 1 min before continuing.

Answer 2

Firstly, you should not remove elements from queue inside the for loop where you are iterating over the elements of it.

I want this function to run immediately after something added to the queue

To achieve such kind of things, you should use something like BehaviorSubject