create project

kitabcitab/node_modules/next/dist/server/lib/incremental-cache/index.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+var _fileSystemCache = _interopRequireDefault(require("./file-system-cache"));
+var _path = _interopRequireDefault(require("../../../shared/lib/isomorphic/path"));
+var _normalizePagePath = require("../../../shared/lib/page-path/normalize-page-path");
+var _fetchCache = _interopRequireDefault(require("./fetch-cache"));
+function _interopRequireDefault(obj) {
+    return obj && obj.__esModule ? obj : {
+        default: obj
+    };
+}
+function toRoute(pathname) {
+    return pathname.replace(/\/$/, "").replace(/\/index$/, "") || "/";
+}
+class CacheHandler {
+    // eslint-disable-next-line
+    constructor(_ctx){}
+    async get(_key, _fetchCache) {
+        return {};
+    }
+    async set(_key, _data, _fetchCache) {}
+}
+exports.CacheHandler = CacheHandler;
+class IncrementalCache {
+    constructor({ fs , dev , appDir , flushToDisk , fetchCache , minimalMode , serverDistDir , requestHeaders , maxMemoryCacheSize , getPrerenderManifest , incrementalCacheHandlerPath  }){
+        let cacheHandlerMod = _fileSystemCache.default;
+        if (process.env.NEXT_RUNTIME !== "edge" && incrementalCacheHandlerPath) {
+            cacheHandlerMod = require(incrementalCacheHandlerPath);
+            cacheHandlerMod = cacheHandlerMod.default || cacheHandlerMod;
+        }
+        if (minimalMode && fetchCache) {
+            cacheHandlerMod = _fetchCache.default;
+        }
+        if (process.env.__NEXT_TEST_MAX_ISR_CACHE) {
+            // Allow cache size to be overridden for testing purposes
+            maxMemoryCacheSize = parseInt(process.env.__NEXT_TEST_MAX_ISR_CACHE, 10);
+        }
+        this.dev = dev;
+        this.minimalMode = minimalMode;
+        this.requestHeaders = requestHeaders;
+        this.prerenderManifest = getPrerenderManifest();
+        this.cacheHandler = new cacheHandlerMod({
+            dev,
+            fs,
+            flushToDisk,
+            serverDistDir,
+            maxMemoryCacheSize,
+            _appDir: !!appDir,
+            _requestHeaders: requestHeaders
+        });
+    }
+    calculateRevalidate(pathname, fromTime) {
+        // in development we don't have a prerender-manifest
+        // and default to always revalidating to allow easier debugging
+        if (this.dev) return new Date().getTime() - 1000;
+        // if an entry isn't present in routes we fallback to a default
+        // of revalidating after 1 second
+        const { initialRevalidateSeconds  } = this.prerenderManifest.routes[toRoute(pathname)] || {
+            initialRevalidateSeconds: 1
+        };
+        const revalidateAfter = typeof initialRevalidateSeconds === "number" ? initialRevalidateSeconds * 1000 + fromTime : initialRevalidateSeconds;
+        return revalidateAfter;
+    }
+    _getPathname(pathname, fetchCache) {
+        return fetchCache ? pathname : (0, _normalizePagePath).normalizePagePath(pathname);
+    }
+    // x-ref: https://github.com/facebook/react/blob/2655c9354d8e1c54ba888444220f63e836925caa/packages/react/src/ReactFetch.js#L23
+    async fetchCacheKey(url, init = {}) {
+        const cacheString = JSON.stringify([
+            url,
+            init.method,
+            init.headers,
+            init.mode,
+            init.redirect,
+            init.credentials,
+            init.referrer,
+            init.referrerPolicy,
+            init.integrity,
+            init.next,
+            init.cache, 
+        ]);
+        let cacheKey;
+        if (process.env.NEXT_RUNTIME === "edge") {
+            function bufferToHex(buffer) {
+                return Array.prototype.map.call(new Uint8Array(buffer), (b)=>b.toString(16).padStart(2, "0")).join("");
+            }
+            const buffer1 = new TextEncoder().encode(cacheString);
+            cacheKey = bufferToHex(await crypto.subtle.digest("SHA-256", buffer1));
+        } else {
+            const crypto = require("crypto");
+            cacheKey = crypto.createHash("sha256").update(cacheString).digest("hex");
+        }
+        return cacheKey;
+    }
+    // get data from cache if available
+    async get(pathname, fetchCache) {
+        var ref, ref1;
+        // we don't leverage the prerender cache in dev mode
+        // so that getStaticProps is always called for easier debugging
+        if (this.dev) return null;
+        pathname = this._getPathname(pathname, fetchCache);
+        let entry = null;
+        const cacheData = await this.cacheHandler.get(pathname, fetchCache);
+        if ((cacheData == null ? void 0 : (ref = cacheData.value) == null ? void 0 : ref.kind) === "FETCH") {
+            const data = cacheData.value.data;
+            const age = Math.round((Date.now() - (cacheData.lastModified || 0)) / 1000);
+            const revalidate = cacheData.value.revalidate;
+            return {
+                isStale: age > revalidate,
+                value: {
+                    kind: "FETCH",
+                    data,
+                    age,
+                    revalidate,
+                    isStale: age > revalidate
+                },
+                revalidateAfter: (cacheData.lastModified || Date.now()) + revalidate * 1000
+            };
+        }
+        const curRevalidate = (ref1 = this.prerenderManifest.routes[toRoute(pathname)]) == null ? void 0 : ref1.initialRevalidateSeconds;
+        const revalidateAfter = this.calculateRevalidate(pathname, (cacheData == null ? void 0 : cacheData.lastModified) || Date.now());
+        const isStale = revalidateAfter !== false && revalidateAfter < Date.now() ? true : undefined;
+        if (cacheData) {
+            entry = {
+                isStale,
+                curRevalidate,
+                revalidateAfter,
+                value: cacheData.value
+            };
+        }
+        if (!cacheData && this.prerenderManifest.notFoundRoutes.includes(pathname)) {
+            // for the first hit after starting the server the cache
+            // may not have a way to save notFound: true so if
+            // the prerender-manifest marks this as notFound then we
+            // return that entry and trigger a cache set to give it a
+            // chance to update in-memory entries
+            entry = {
+                isStale,
+                value: null,
+                curRevalidate,
+                revalidateAfter
+            };
+            this.set(pathname, entry.value, curRevalidate, fetchCache);
+        }
+        return entry;
+    }
+    // populate the incremental cache with new data
+    async set(pathname, data, revalidateSeconds, fetchCache) {
+        if (this.dev) return;
+        pathname = this._getPathname(pathname, fetchCache);
+        try {
+            // we use the prerender manifest memory instance
+            // to store revalidate timings for calculating
+            // revalidateAfter values so we update this on set
+            if (typeof revalidateSeconds !== "undefined" && !fetchCache) {
+                this.prerenderManifest.routes[pathname] = {
+                    dataRoute: _path.default.posix.join("/_next/data", `${(0, _normalizePagePath).normalizePagePath(pathname)}.json`),
+                    srcRoute: null,
+                    initialRevalidateSeconds: revalidateSeconds
+                };
+            }
+            await this.cacheHandler.set(pathname, data, fetchCache);
+        } catch (error) {
+            console.warn("Failed to update prerender cache for", pathname, error);
+        }
+    }
+}
+exports.IncrementalCache = IncrementalCache;
+
+//# sourceMappingURL=index.js.map