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javascript - 为nodejs中的一系列 promise 添加延迟或 sleep

转载 作者：行者123 更新时间：2023-11-30 07:53:13 25 4
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我有一个一直在努力解决的 promise 链问题。我调用了一个外部 api，该 api 返回我需要处理并摄取到 mongo 数据库中的数据。我在 express 中使用 nodejs 和 mongodb。无论如何，对 api 的调用工作正常，问题是我同时进行了大量调用。我想让他们慢下来，比如为一组打所有电话。等一下。为下一组进行所有调用。如果这是已知数量的集合，我会保证将它们链接起来。我不知道有多少组，所以我循环遍历它们。我认为关闭是问题所在，但无法解决。转到示例代码!

  function readApi(carFactory){
    var promise = new Promise(function(resolve, reject) {
      // call out to api, get set of car data from factory1

      console.log(carFactory);
      if (true) {
        console.log('resolved');
        resolve("Stuff worked!"+carFactory);
      }
      else {
        reject(Error("It broke"));
      }
    });
    return promise;
  }

  function manager(){

    //singular call
    readApi("this is a singular test").then(returnedThing=>{
      console.log(returnedThing); //Stuff worked! this is a singular test
    });

    let dynamicList = ["carFactory1", "carFactory2","carFactory3","carFactory..N"];
    let readApiAction = [];
    dynamicList.forEach(carIter=>{
      readApiAction.push(readApi(carIter));
    });
    //ok so now I got an array of promise objects.
    //I want to call the first one, wait 1 minute and then call the next one. 

    //originally I was calling promise.all, but there is no way to get at 
    //each promise to pause them out so this code is what I am looking to fix
    let results= Promise.all(readApiAction);
    results.then(data=>{
      data.forEach(resolvedData=>{
        console.log(resolvedData); //Stuff worked carFactory1, etc... 
      });      
    });


    //singular call with timeout, this does not work, each one called at the same time
    let readApiActionTimeouts = [];
    dynamicList.forEach(carIter=>{
      setTimeout(callingTimeout(carIter), 6000);
    });
  }

  //just a function to call the promise in a timeout
  //this fails with this  - TypeError: "callback" argument must be a function
  function callingTimeout(carIter){
    readApi(carIter).then(returnedThing=>{
      console.log("timeout version"+returnedThing);
    });
  }

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