init

马宇豪

2024-07-16 f591c27b57e2418c9495bc02ae8cfff84d35bc18

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/*
    MIT License http://www.opensource.org/licenses/mit-license.php
    Author Tobias Koppers @sokra
*/
 
"use strict";
 
/** @typedef {import("./Resolver")} Resolver */
/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
/** @typedef {import("./Resolver").ResolveContextYield} ResolveContextYield */
/** @typedef {{[k: string]: ResolveRequest | ResolveRequest[] | undefined}} Cache */
 
/**
 * @param {string} type type of cache
 * @param {ResolveRequest} request request
 * @param {boolean} withContext cache with context?
 * @returns {string} cache id
 */
function getCacheId(type, request, withContext) {
    return JSON.stringify({
        type,
        context: withContext ? request.context : "",
        path: request.path,
        query: request.query,
        fragment: request.fragment,
        request: request.request
    });
}
 
module.exports = class UnsafeCachePlugin {
    /**
     * @param {string | ResolveStepHook} source source
     * @param {function(ResolveRequest): boolean} filterPredicate filterPredicate
     * @param {Cache} cache cache
     * @param {boolean} withContext withContext
     * @param {string | ResolveStepHook} target target
     */
    constructor(source, filterPredicate, cache, withContext, target) {
        this.source = source;
        this.filterPredicate = filterPredicate;
        this.withContext = withContext;
        this.cache = cache;
        this.target = target;
    }
 
    /**
     * @param {Resolver} resolver the resolver
     * @returns {void}
     */
    apply(resolver) {
        const target = resolver.ensureHook(this.target);
        resolver
            .getHook(this.source)
            .tapAsync("UnsafeCachePlugin", (request, resolveContext, callback) => {
                if (!this.filterPredicate(request)) return callback();
                const isYield = typeof resolveContext.yield === "function";
                const cacheId = getCacheId(
                    isYield ? "yield" : "default",
                    request,
                    this.withContext
                );
                const cacheEntry = this.cache[cacheId];
                if (cacheEntry) {
                    if (isYield) {
                        const yield_ = /** @type {Function} */ (resolveContext.yield);
                        if (Array.isArray(cacheEntry)) {
                            for (const result of cacheEntry) yield_(result);
                        } else {
                            yield_(cacheEntry);
                        }
                        return callback(null, null);
                    }
                    return callback(null, /** @type {ResolveRequest} */ (cacheEntry));
                }
 
                /** @type {ResolveContextYield|undefined} */
                let yieldFn;
                /** @type {ResolveContextYield|undefined} */
                let yield_;
                /** @type {ResolveRequest[]} */
                const yieldResult = [];
                if (isYield) {
                    yieldFn = resolveContext.yield;
                    yield_ = result => {
                        yieldResult.push(result);
                    };
                }
 
                resolver.doResolve(
                    target,
                    request,
                    null,
                    yield_ ? { ...resolveContext, yield: yield_ } : resolveContext,
                    (err, result) => {
                        if (err) return callback(err);
                        if (isYield) {
                            if (result) yieldResult.push(result);
                            for (const result of yieldResult) {
                                /** @type {ResolveContextYield} */
                                (yieldFn)(result);
                            }
                            this.cache[cacheId] = yieldResult;
                            return callback(null, null);
                        }
                        if (result) return callback(null, (this.cache[cacheId] = result));
                        callback();
                    }
                );
            });
    }
};