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cache: serve stale response

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This commit is contained in:
Alex Gleason
2024-04-13 14:33:59 -05:00
parent 6ab3a640bf
commit afed0a0b34
2 changed files with 19 additions and 6 deletions
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23
src/middleware/cache.ts
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@@ -12,19 +12,32 @@ export const cache = (opts: CacheOpts): MiddlewareHandler => {
let expires = Date.now() + opts.expires;
return async (c, next) => {
if (!response || (Date.now() > expires)) {
debug('Building cache for page', c.req.url);
expires = Date.now() + opts.expires;
const now = Date.now();
const expired = now > expires;
async function updateCache() {
await next();
const res = c.res.clone();
if (res.status < 500) {
response = res;
}
} else {
return res;
}
if (response && !expired) {
debug('Serving page from cache', c.req.url);
return response.clone();
} else {
expires = Date.now() + opts.expires;
if (response && expired) {
debug('Serving stale cache, rebuilding', c.req.url);
const stale = response.clone();
updateCache();
await new Promise((resolve) => setTimeout(resolve, 0));
return stale;
}
debug('Building cache for page', c.req.url);
return await updateCache();
}
};
};