how to fix async await logic on nodejs

Question

I'm trying to create a google bucket if it does not exist with the following logic:

async function createBucket(id){
    const bucket = storage.bucket("bucket-" + id);
    const exists = await bucket.exists();
    if (!exists) {
      console.log("creating bucket>>" + "bucket-" + id);
      try {
        await bucket.create();
      } catch (e) {
        console.error("error in creating bucket>>>", e);
      }
    } else {
      console.log("it already exists >>" + exists);
    }
}

strangely, I'm seeing it already exists >> false, when I should only see either it already exists >> true or creating bucket>>bucket-123. Any help with resolving this would be much appreciated. Thank you!

how storage is initialised? Why not use promise bucket.exits.then(... — Rafee
– Rafee, Commented Apr 26, 2021 at 5:07
Is storage.bucket("bucket-" + id); an asynchronous call too? What happens if you write await storage.bucket("bucket-" + id);? — user6749601
– user6749601, Commented Apr 26, 2021 at 5:20

reactor · Accepted Answer · 2021-04-26 05:35:17Z

2

The issue was that bucket.exists returns an array with the result. In my case, [false], which didn't seem to be suggested at here https://googleapis.dev/nodejs/storage/latest/Bucket.html#exists . The following fixes the issue:

async function createBucket(id){
    const bucket = storage.bucket("bucket-" + id);
    const [exists] = await bucket.exists();
    if (!exists) {
      console.log("creating bucket>>" + "bucket-" + id);
      try {
        await bucket.create();
      } catch (e) {
        console.error("error in creating bucket>>>", e);
      }
    } else {
      console.log("it already exists >>" + exists);
    }
}

answered Apr 26, 2021 at 5:35

reactor

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1 Comment

user433342 Over a year ago

Thanks for this, just tried in google cloud functions nodejs14 with 'latest' as include reference, got Invalid bucket name on exists()... still working for u?

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