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ungarson/tryAsyncUntilOk.js

Last active October 13, 2021 08:56
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Try asynchronous function several times until it returns result
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tryAsyncUntilOk.js
async function tryAsyncUntilOk(func, times = 4, timeout = 1250) {
function delay(ms) {
return new Promise(resolve => setTimeout(resolve, ms));
}
for (let i = 0; i < times; i++) {
try {
const res = await func();
if (typeof res !== "undefined") {
return res;
} else {
await delay(timeout);
}
} catch (e) {
if (i === times - 1) {
throw e;
}
}
}
}
@ungarson
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ungarson commented Oct 13, 2021 •
edited
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Test function:

let tryCount = 0;
function delayWithError(t, v) {
   return new Promise(function(resolve) { 
        if (tryCount === 0) {
           ++tryCount;
           throw new Error('Yooouuhooo');
        } else {
            ++tryCount;
            setTimeout(resolve.bind(null, v), t)
        }
   });
}

Call it:

const res = await tryAsyncUntilOk(() => delayWithError(2000, 30));

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