132 lines
6.3 KiB
JavaScript
132 lines
6.3 KiB
JavaScript
import RenderResult from "../render-result";
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export * from "./types";
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export default class ResponseCache {
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constructor(minimalMode){
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this.pendingResponses = new Map();
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// this is a hack to avoid Webpack knowing this is equal to this.minimalMode
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// because we replace this.minimalMode to true in production bundles.
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const minimalModeKey = "minimalMode";
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this[minimalModeKey] = minimalMode;
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}
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get(key, responseGenerator, context) {
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var _this_previousCacheItem;
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const { incrementalCache } = context;
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// ensure on-demand revalidate doesn't block normal requests
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const pendingResponseKey = key ? `${key}-${context.isOnDemandRevalidate ? "1" : "0"}` : null;
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const pendingResponse = pendingResponseKey ? this.pendingResponses.get(pendingResponseKey) : null;
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if (pendingResponse) {
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return pendingResponse;
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}
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let resolver = ()=>{};
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let rejecter = ()=>{};
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const promise = new Promise((resolve, reject)=>{
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resolver = resolve;
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rejecter = reject;
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});
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if (pendingResponseKey) {
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this.pendingResponses.set(pendingResponseKey, promise);
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}
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let resolved = false;
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const resolve = (cacheEntry)=>{
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if (pendingResponseKey) {
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// Ensure all reads from the cache get the latest value.
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this.pendingResponses.set(pendingResponseKey, Promise.resolve(cacheEntry));
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}
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if (!resolved) {
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resolved = true;
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resolver(cacheEntry);
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}
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};
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// we keep the previous cache entry around to leverage
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// when the incremental cache is disabled in minimal mode
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if (pendingResponseKey && this.minimalMode && ((_this_previousCacheItem = this.previousCacheItem) == null ? void 0 : _this_previousCacheItem.key) === pendingResponseKey && this.previousCacheItem.expiresAt > Date.now()) {
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resolve(this.previousCacheItem.entry);
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this.pendingResponses.delete(pendingResponseKey);
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return promise;
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}
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(async ()=>{
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let cachedResponse = null;
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try {
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cachedResponse = key && !this.minimalMode ? await incrementalCache.get(key) : null;
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if (cachedResponse && !context.isOnDemandRevalidate) {
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var _cachedResponse_value, _cachedResponse_value1;
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if (((_cachedResponse_value = cachedResponse.value) == null ? void 0 : _cachedResponse_value.kind) === "FETCH") {
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throw new Error(`invariant: unexpected cachedResponse of kind fetch in response cache`);
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}
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resolve({
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isStale: cachedResponse.isStale,
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revalidate: cachedResponse.curRevalidate,
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value: ((_cachedResponse_value1 = cachedResponse.value) == null ? void 0 : _cachedResponse_value1.kind) === "PAGE" ? {
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kind: "PAGE",
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html: RenderResult.fromStatic(cachedResponse.value.html),
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pageData: cachedResponse.value.pageData,
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headers: cachedResponse.value.headers,
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status: cachedResponse.value.status
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} : cachedResponse.value
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});
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if (!cachedResponse.isStale || context.isPrefetch) {
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// The cached value is still valid, so we don't need
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// to update it yet.
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return;
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}
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}
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const cacheEntry = await responseGenerator(resolved, cachedResponse);
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const resolveValue = cacheEntry === null ? null : {
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...cacheEntry,
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isMiss: !cachedResponse
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};
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// for on-demand revalidate wait to resolve until cache is set
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if (!context.isOnDemandRevalidate) {
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resolve(resolveValue);
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}
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if (key && cacheEntry && typeof cacheEntry.revalidate !== "undefined") {
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if (this.minimalMode) {
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this.previousCacheItem = {
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key: pendingResponseKey || key,
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entry: cacheEntry,
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expiresAt: Date.now() + 1000
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};
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} else {
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var _cacheEntry_value;
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await incrementalCache.set(key, ((_cacheEntry_value = cacheEntry.value) == null ? void 0 : _cacheEntry_value.kind) === "PAGE" ? {
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kind: "PAGE",
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html: cacheEntry.value.html.toUnchunkedString(),
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pageData: cacheEntry.value.pageData,
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headers: cacheEntry.value.headers,
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status: cacheEntry.value.status
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} : cacheEntry.value, {
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revalidate: cacheEntry.revalidate
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});
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}
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} else {
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this.previousCacheItem = undefined;
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}
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if (context.isOnDemandRevalidate) {
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resolve(resolveValue);
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}
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} catch (err) {
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// when a getStaticProps path is erroring we automatically re-set the
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// existing cache under a new expiration to prevent non-stop retrying
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if (cachedResponse && key) {
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await incrementalCache.set(key, cachedResponse.value, {
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revalidate: Math.min(Math.max(cachedResponse.revalidate || 3, 3), 30)
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});
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}
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// while revalidating in the background we can't reject as
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// we already resolved the cache entry so log the error here
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if (resolved) {
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console.error(err);
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} else {
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rejecter(err);
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}
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} finally{
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if (pendingResponseKey) {
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this.pendingResponses.delete(pendingResponseKey);
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}
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}
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})();
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return promise;
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}
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}
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//# sourceMappingURL=index.js.map
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