84 lines
3.5 KiB
JavaScript
84 lines
3.5 KiB
JavaScript
/**
|
|
* In the web server, there is currently no incremental cache provided and we
|
|
* always SSR the page.
|
|
*/ export default class WebResponseCache {
|
|
constructor(minimalMode){
|
|
this.pendingResponses = new Map();
|
|
// this is a hack to avoid Webpack knowing this is equal to this.minimalMode
|
|
// because we replace this.minimalMode to true in production bundles.
|
|
Object.assign(this, {
|
|
minimalMode
|
|
});
|
|
}
|
|
get(key, responseGenerator, context) {
|
|
var _this_previousCacheItem;
|
|
// ensure on-demand revalidate doesn't block normal requests
|
|
const pendingResponseKey = key ? `${key}-${context.isOnDemandRevalidate ? "1" : "0"}` : null;
|
|
const pendingResponse = pendingResponseKey ? this.pendingResponses.get(pendingResponseKey) : null;
|
|
if (pendingResponse) {
|
|
return pendingResponse;
|
|
}
|
|
const { promise, resolve: resolver, reject: rejecter } = Promise.withResolvers();
|
|
if (pendingResponseKey) {
|
|
this.pendingResponses.set(pendingResponseKey, promise);
|
|
}
|
|
let resolved = false;
|
|
const resolve = (cacheEntry)=>{
|
|
if (pendingResponseKey) {
|
|
// Ensure all reads from the cache get the latest value.
|
|
this.pendingResponses.set(pendingResponseKey, Promise.resolve(cacheEntry));
|
|
}
|
|
if (!resolved) {
|
|
resolved = true;
|
|
resolver(cacheEntry);
|
|
}
|
|
};
|
|
// we keep the previous cache entry around to leverage
|
|
// when the incremental cache is disabled in minimal mode
|
|
if (pendingResponseKey && this.minimalMode && ((_this_previousCacheItem = this.previousCacheItem) == null ? void 0 : _this_previousCacheItem.key) === pendingResponseKey && this.previousCacheItem.expiresAt > Date.now()) {
|
|
resolve(this.previousCacheItem.entry);
|
|
this.pendingResponses.delete(pendingResponseKey);
|
|
return promise;
|
|
}
|
|
(async ()=>{
|
|
try {
|
|
const cacheEntry = await responseGenerator(resolved);
|
|
const resolveValue = cacheEntry === null ? null : {
|
|
...cacheEntry,
|
|
isMiss: true
|
|
};
|
|
// for on-demand revalidate wait to resolve until cache is set
|
|
if (!context.isOnDemandRevalidate) {
|
|
resolve(resolveValue);
|
|
}
|
|
if (key && cacheEntry && typeof cacheEntry.revalidate !== "undefined") {
|
|
this.previousCacheItem = {
|
|
key: pendingResponseKey || key,
|
|
entry: cacheEntry,
|
|
expiresAt: Date.now() + 1000
|
|
};
|
|
} else {
|
|
this.previousCacheItem = undefined;
|
|
}
|
|
if (context.isOnDemandRevalidate) {
|
|
resolve(resolveValue);
|
|
}
|
|
} catch (err) {
|
|
// while revalidating in the background we can't reject as
|
|
// we already resolved the cache entry so log the error here
|
|
if (resolved) {
|
|
console.error(err);
|
|
} else {
|
|
rejecter(err);
|
|
}
|
|
} finally{
|
|
if (pendingResponseKey) {
|
|
this.pendingResponses.delete(pendingResponseKey);
|
|
}
|
|
}
|
|
})();
|
|
return promise;
|
|
}
|
|
}
|
|
|
|
//# sourceMappingURL=web.js.map
|