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node_modules/next/dist/server/lib/cache-handlers/default.js

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+/**
+ * This is the default "use cache" handler it defaults to an in-memory store.
+ * In-memory caches are fragile and should not use stale-while-revalidate
+ * semantics on the caches because it's not worth warming up an entry that's
+ * likely going to get evicted before we get to use it anyway. However, we also
+ * don't want to reuse a stale entry for too long so stale entries should be
+ * considered expired/missing in such cache handlers.
+ */ "use strict";
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+Object.defineProperty(exports, "createDefaultCacheHandler", {
+    enumerable: true,
+    get: function() {
+        return createDefaultCacheHandler;
+    }
+});
+const _lrucache = require("../lru-cache");
+const _tagsmanifestexternal = require("../incremental-cache/tags-manifest.external");
+function createDefaultCacheHandler(maxSize) {
+    // If the max size is 0, return a cache handler that doesn't cache anything,
+    // this avoids an unnecessary LRUCache instance and potential memory
+    // allocation.
+    if (maxSize === 0) {
+        return {
+            get: ()=>Promise.resolve(undefined),
+            set: ()=>Promise.resolve(),
+            refreshTags: ()=>Promise.resolve(),
+            getExpiration: ()=>Promise.resolve(0),
+            updateTags: ()=>Promise.resolve()
+        };
+    }
+    const memoryCache = new _lrucache.LRUCache(maxSize, (entry)=>entry.size);
+    const pendingSets = new Map();
+    const debug = process.env.NEXT_PRIVATE_DEBUG_CACHE ? console.debug.bind(console, 'DefaultCacheHandler:') : undefined;
+    return {
+        async get (cacheKey) {
+            const pendingPromise = pendingSets.get(cacheKey);
+            if (pendingPromise) {
+                debug == null ? void 0 : debug('get', cacheKey, 'pending');
+                await pendingPromise;
+            }
+            const privateEntry = memoryCache.get(cacheKey);
+            if (!privateEntry) {
+                debug == null ? void 0 : debug('get', cacheKey, 'not found');
+                return undefined;
+            }
+            const entry = privateEntry.entry;
+            if (performance.timeOrigin + performance.now() > entry.timestamp + entry.revalidate * 1000) {
+                // In-memory caches should expire after revalidate time because it is
+                // unlikely that a new entry will be able to be used before it is dropped
+                // from the cache.
+                debug == null ? void 0 : debug('get', cacheKey, 'expired');
+                return undefined;
+            }
+            let revalidate = entry.revalidate;
+            if ((0, _tagsmanifestexternal.areTagsExpired)(entry.tags, entry.timestamp)) {
+                debug == null ? void 0 : debug('get', cacheKey, 'had expired tag');
+                return undefined;
+            }
+            if ((0, _tagsmanifestexternal.areTagsStale)(entry.tags, entry.timestamp)) {
+                debug == null ? void 0 : debug('get', cacheKey, 'had stale tag');
+                revalidate = -1;
+            }
+            const [returnStream, newSaved] = entry.value.tee();
+            entry.value = newSaved;
+            debug == null ? void 0 : debug('get', cacheKey, 'found', {
+                tags: entry.tags,
+                timestamp: entry.timestamp,
+                expire: entry.expire,
+                revalidate
+            });
+            return {
+                ...entry,
+                revalidate,
+                value: returnStream
+            };
+        },
+        async set (cacheKey, pendingEntry) {
+            debug == null ? void 0 : debug('set', cacheKey, 'start');
+            let resolvePending = ()=>{};
+            const pendingPromise = new Promise((resolve)=>{
+                resolvePending = resolve;
+            });
+            pendingSets.set(cacheKey, pendingPromise);
+            const entry = await pendingEntry;
+            let size = 0;
+            try {
+                const [value, clonedValue] = entry.value.tee();
+                entry.value = value;
+                const reader = clonedValue.getReader();
+                for(let chunk; !(chunk = await reader.read()).done;){
+                    size += Buffer.from(chunk.value).byteLength;
+                }
+                memoryCache.set(cacheKey, {
+                    entry,
+                    isErrored: false,
+                    errorRetryCount: 0,
+                    size
+                });
+                debug == null ? void 0 : debug('set', cacheKey, 'done');
+            } catch (err) {
+                // TODO: store partial buffer with error after we retry 3 times
+                debug == null ? void 0 : debug('set', cacheKey, 'failed', err);
+            } finally{
+                resolvePending();
+                pendingSets.delete(cacheKey);
+            }
+        },
+        async refreshTags () {
+        // Nothing to do for an in-memory cache handler.
+        },
+        async getExpiration (tags) {
+            const expirations = tags.map((tag)=>{
+                const entry = _tagsmanifestexternal.tagsManifest.get(tag);
+                if (!entry) return 0;
+                // Return the most recent timestamp (either expired or stale)
+                return entry.expired || 0;
+            });
+            const expiration = Math.max(...expirations, 0);
+            debug == null ? void 0 : debug('getExpiration', {
+                tags,
+                expiration
+            });
+            return expiration;
+        },
+        async updateTags (tags, durations) {
+            const now = Math.round(performance.timeOrigin + performance.now());
+            debug == null ? void 0 : debug('updateTags', {
+                tags,
+                timestamp: now
+            });
+            for (const tag of tags){
+                // TODO: update file-system-cache?
+                const existingEntry = _tagsmanifestexternal.tagsManifest.get(tag) || {};
+                if (durations) {
+                    // Use provided durations directly
+                    const updates = {
+                        ...existingEntry
+                    };
+                    // mark as stale immediately
+                    updates.stale = now;
+                    if (durations.expire !== undefined) {
+                        updates.expired = now + durations.expire * 1000 // Convert seconds to ms
+                        ;
+                    }
+                    _tagsmanifestexternal.tagsManifest.set(tag, updates);
+                } else {
+                    // Update expired field for immediate expiration (default behavior when no durations provided)
+                    _tagsmanifestexternal.tagsManifest.set(tag, {
+                        ...existingEntry,
+                        expired: now
+                    });
+                }
+            }
+        }
+    };
+}
+
+//# sourceMappingURL=default.js.map