/*
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();
}
);
});
}
};