Promise not working in JS worker

Hi I have am using the S3 client in a Cloudflare worker

import {GetObjectCommand, ListObjectsV2Command, ListObjectsV2CommandOutput, S3Client} from "@aws-sdk/client-s3";

// Create client
const S3: S3Client = new S3Client({
    region: "auto",
    endpoint: `https://${accountid}.r2.cloudflarestorage.com`,
    credentials: {
        accessKeyId: env.AWS_ACCESS_KEY_ID,
        secretAccessKey: env.AWS_SECRET_ACCESS_KEY,
    },
});

import {GetObjectCommand, ListObjectsV2Command, ListObjectsV2CommandOutput, S3Client} from "@aws-sdk/client-s3";

// Create client
const S3: S3Client = new S3Client({
    region: "auto",
    endpoint: `https://${accountid}.r2.cloudflarestorage.com`,
    credentials: {
        accessKeyId: env.AWS_ACCESS_KEY_ID,
        secretAccessKey: env.AWS_SECRET_ACCESS_KEY,
    },
});

If I use await syntax I can log the results from this call in a Worker

const item: ListObjectsV2CommandOutput = await S3.send(new ListObjectsV2Command({Bucket: 'pics'}));
item.Contents.map((item) => {
    console.log(item.Key);})

const item: ListObjectsV2CommandOutput = await S3.send(new ListObjectsV2Command({Bucket: 'pics'}));
item.Contents.map((item) => {
    console.log(item.Key);})

If I try the same thing using .then() syntax I do not get any logs

S3.send(
    new ListObjectsV2Command({Bucket: 'pics'})
).then((item) => {
    console.log(item.Contents[0].Key)});

S3.send(
    new ListObjectsV2Command({Bucket: 'pics'})
).then((item) => {
    console.log(item.Contents[0].Key)});

Can anyone please explain why?

5 Replies

Sam•7mo ago

Why are you using a s3 client package, instead of the Wrangler bindings?

Chaika•7mo ago

If the worker returns a response, it ends, and all dangling/left promises are cancelled but yea, why not r2 binding?

Barbara88OP•7mo ago

Thanks heaps for that! that makes sense I would like to transition to R2 binding but the documentation on how to get signed urls from the R2 bindings was not as clear as the S3 client doco

Sam•7mo ago

https://developers.cloudflare.com/r2/api/s3/presigned-urls/ https://developers.cloudflare.com/r2/examples/aws/aws-sdk-js/#generate-presigned-urls

Barbara88OP•7mo ago

Thanks! managed to get it working using the R2 bindings, i had a small bug when i was trying to do this earlier

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Promise not working in JS worker