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Retry to resolve an element #81

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merged 4 commits into from
Jul 8, 2021
Merged

Retry to resolve an element #81

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c86893b
Retry to resolve an element
julianrubisch Feb 17, 2021
926b742
Retry to resolve an element
julianrubisch Feb 17, 2021
5fd4e4b
Merge branch 'retry-resolve' of github.com:julianrubisch/futurism int…
julianrubisch Apr 23, 2021
602ee1e
Try exponential backoff
julianrubisch Jul 2, 2021
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21 changes: 19 additions & 2 deletions javascript/elements/futurism_utils.js
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Original file line number Diff line number Diff line change
Expand Up @@ -19,10 +19,27 @@ const dispatchAppearEvent = (entry, observer = null) => {
target.dispatchEvent(evt)
}

// from https://advancedweb.hu/how-to-implement-an-exponential-backoff-retry-strategy-in-javascript/#rejection-based-retrying
const wait = ms => new Promise(resolve => setTimeout(resolve, ms))

const callWithRetry = async (fn, depth = 0) => {
try {
return await fn()
} catch (e) {
if (depth > 10) {
throw e
}
await wait(1.15 ** depth * 2000)

return callWithRetry(fn, depth + 1)
}
}

const observerCallback = (entries, observer) => {
entries.forEach(entry => {
entries.forEach(async entry => {
if (!entry.isIntersecting) return
dispatchAppearEvent(entry, observer)

await callWithRetry(dispatchAppearEvent(entry, observer))
})
}

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