Error handling: How can I await and re execute function after a timeout

Question

I would like to handle async timeouts by awaiting the execution and re-executing a function including error handling after it fails.

Pseudo code:

01 call and await async function update()
02 if no error -> continue to line 05
03 sleep for 10000ms
04 Jump to line 01 //call update() again and handle possible errors
05 //continues execution

seems simple, but I cant get the asynchronous part working

Some common structure without any promise handling


let success = false;

while (!success) {
  try{
    update()
    success = true;
  } catch (e) {
    setTimeout(() => {},10000)
  }
}

I know that I should be working with .catch and promises, but cant figure out how.

Thanks for any help and explanations

To add promise handling, just await the promise returned by the update() call? — Bergi
– Bergi, Commented Jul 11, 2022 at 16:17
"setTimeout(() => {},10000)" - that's not how to delay a loop — Bergi
– Bergi, Commented Jul 11, 2022 at 16:18

Alan Friedman · Accepted Answer · 2022-07-11 16:27:57Z

2

Not sure if this is what you're looking for, but here's an example of retrying an async call until success, with a 3 second delay between each attempt:

const wait = timeout => new Promise(resolve => setTimeout(resolve, timeout));

let counter = 0;

async function update() {
  console.log('Updating...');
  await wait(1000)
  if (counter === 3) {
    console.log('Update success');
  } else {
    counter += 1;
    throw new Error('Update failure');
  }
}

async function callUpdateUntilSuccess() {
  try {
    await update();
  }catch(err) {
    console.error(err);
    await wait(3000);
    return callUpdateUntilSuccess();
  }
}

(async () => {
  await callUpdateUntilSuccess();
})();

edited Jul 11, 2022 at 16:27

answered Jul 11, 2022 at 16:15

Alan Friedman

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4 Comments

Bergi Over a year ago

Notice that this works only with synchronous update functions

Alan Friedman Over a year ago

@Bergi It works with async update functions as well. I just updated the example to demonstrate that.

Bergi Over a year ago

Ah, but you changed return into await - that's all I was complaining about :-)

Alan Friedman Over a year ago

Ah ok, thanks for pointing that out! I did have to make that change.

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