Firebase云功能:Promise.all问题(promise) [英] Firebase cloud function: problem with Promise.all(promise)

问题描述

我循环抛出Firebase存储中的文件列表，我想在循环时修改字符串，

I loop throw a list of files in Firebase storage and I would like to modify a string while looping,

这是我尝试做的事情:

 var str;

 storage.bucket().file(...).download((err, content) => {
    str=content.toString();

    storage.bucket().getFiles(...).then(results => {
        const files = results[0];
        var promise = new Promise(function(resolve,reject){
           files.forEach(file => {
               ...
               str=str.replace("t","a");
           });
           resolve(str);
      });

      Promise.all(promise).then(function(str) {
        console.log(str); //NOT OKAY, the value is still "test" 

        file.save(str, function(err) { ... });
     });

我也尝试过:

promise.then(function(result){

promise.then(function(result) {

但结果相同:(

更新:我已经编辑了上面的代码，但仍然无法正常工作:

UPDATE : I edited the code above but it still doesn't work :

有什么主意吗?

更新2:

它仍然不起作用:(

推荐答案

如果对某人有用，这是我找到的解决方案:

If it can be usefull for someone, here is the solution I found:

var promises = [];
var str="string containing data to replace with signed url";

storage.bucket().getFiles({ prefix: folderPath }).then(results => {
  const files = results[0];
  files.forEach(function(file) {

     promises.push( //the trick was here

       file.getSignedUrl(signedUrlConfig).then(signedUrls => {
         ...
         surl = signedUrls[0];
         str=str.replace("a",surl); //eg: replace with signed url.
         return str;
       });
     );
  });
  Promise.all(promises).then(() => {
    console.log(str); //str contains all signed url
  });
});

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