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index.ts

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  • queue.ts 784 B
    import URL from 'url';
    import PQueue from 'p-queue';
    import { getRequestLimit } from './host-rules';
    
    const hostQueues = new Map<string | null, PQueue | null>();
    
    function getUrlHost(url: string): string | null {
      try {
        return URL.parse(url).host;
      } catch (e) {
        return null;
      }
    }
    
    export function getQueue(url: string): PQueue | null {
      const host = getUrlHost(url);
      if (!host) {
        return null;
      }
    
      let queue = hostQueues.get(host);
      if (queue === undefined) {
        queue = null; // null represents "no queue", as opposed to undefined
        const concurrency = getRequestLimit(url);
        if (concurrency) {
          queue = new PQueue({ concurrency });
        }
      }
      hostQueues.set(host, queue);
    
      return queue;
    }
    
    export function clear(): void {
      hostQueues.clear();
    }