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bibliogram
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this could really do with tests

This commit is contained in:
Cadence Fish 2020-02-14 23:28:13 +13:00
parent 351bdefb8e
commit 12798c23aa
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1 changed files with 17 additions and 1 deletions
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18
src/lib/cache.js
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@ -161,7 +161,23 @@ class UserRequestCache extends TtlCache {
this.cleanKey(key)
if (this.cache.has(key)) {
const existing = this.cache.get(key)
if ((!existing.isReel || !isHtmlPreferred || existing.htmlFailed) && !existing.isFailedPromise) return Promise.resolve(existing.data)
if (!existing.isFailedPromise) { // if the existing entry contains usable data
if (!existing.isReel) { // hurrah, the best we could get!
return Promise.resolve(existing.data)
}
// we don't have HTML, only reel
if (!isHtmlPreferred) { // well that's cool, we only wanted reel anyway
return Promise.resolve(existing.data)
} else { // (isHtmlPreferred ~= true): we'd _like_ some HTML, but we don't have it currently. if HTML is blocked then using reel is smart
if (existing.htmlFailed) { // HTML is in fact blocked, so we will have to settle for reel. fortunately we already have reel!
return Promise.resolve(existing.data)
}
}
} else { // (existing.isFailedPromise ~= true): the existing entry is a failed request
if (existing.htmlFailed && !willFetchReel) { // it's no use! the HTML attempt will fail again: abandon it.
return Promise.resolve(existing.data) // this is actually a promise rejection
}
}
}
const pending = callback().then(result => {
if (this.getWithoutClean(key) === pending) { // if nothing has replaced the current cache in the meantime