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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const { isRelativeRequest } = require("./util/path");
/** @typedef {import("./Resolver")} Resolver */
/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
/** @typedef {import("./Resolver").ResolveContextYield} ResolveContextYield */
/** @typedef {{ [k: string]: undefined | ResolveRequest | ResolveRequest[] }} Cache */
/**
* @param {string} relativePath relative path from package root
* @param {string} request relative request
* @param {Resolver} resolver resolver instance
* @returns {string} normalized request with a preserved leading dot
*/
function joinRelativePreservingLeadingDot(relativePath, request, resolver) {
const normalized = resolver.join(relativePath, request);
return isRelativeRequest(normalized) ? normalized : `./${normalized}`;
}
/**
* @param {ResolveRequest} request request
* @returns {string | false | undefined} normalized path
*/
function getCachePath(request) {
if (request.descriptionFileRoot && !request.module) {
return request.descriptionFileRoot;
}
return request.path;
}
/**
* @param {ResolveRequest} request request
* @param {Resolver} resolver resolver instance
* @returns {string | undefined} normalized request string
*/
function getCacheRequest(request, resolver) {
const requestString = request.request;
if (
!requestString ||
!request.relativePath ||
!isRelativeRequest(requestString)
) {
return requestString;
}
return joinRelativePreservingLeadingDot(
request.relativePath,
requestString,
resolver,
);
}
// Cache-key separator: `\0` is safe because paths, requests, queries and
// fragments produced by `parseIdentifier` never contain a raw NUL (the
// \0-escape in identifier.js is decoded back to the original char), and the
// context, when included, is passed through `JSON.stringify`, which escapes
// any NUL to \u0000.
// const SEP = "\0";
/**
* Build the cache id for a request. Called on every `described-resolve`
* invocation when `unsafeCache` is on, so it's a hot path.
*
* Equivalent in meaning to the previous `JSON.stringify({ ... })` form, but
* ~3–5× faster since we avoid the object allocation and JSON serializer for
* the fields that are already plain strings.
* @param {string} type type of cache
* @param {ResolveRequest} request request
* @param {boolean} withContext cache with context?
* @param {Resolver} resolver resolver instance
* @returns {string} cache id
*/
function getCacheId(type, request, withContext, resolver) {
// TODO use it in the next major release, it is faster
// const contextPart = withContext ? JSON.stringify(request.context) : "";
// const path = getCachePath(request);
// const cacheRequest = getCacheRequest(request, resolver);
// return (
// type +
// SEP +
// contextPart +
// SEP +
// (path || "") +
// SEP +
// (request.query || "") +
// SEP +
// (request.fragment || "") +
// SEP +
// (cacheRequest || "")
// );
return JSON.stringify({
type,
context: withContext ? request.context : "",
path: getCachePath(request),
query: request.query,
fragment: request.fragment,
request: getCacheRequest(request, resolver),
});
}
module.exports = class UnsafeCachePlugin {
/**
* @param {string | ResolveStepHook} source source
* @param {(request: 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 resolver.doResolve(
target,
request,
null,
resolveContext,
callback,
);
}
const isYield = typeof resolveContext.yield === "function";
const cacheId = getCacheId(
isYield ? "yield" : "default",
request,
this.withContext,
resolver,
);
const cacheEntry = this.cache[cacheId];
if (cacheEntry) {
if (isYield) {
const yield_ =
/** @type {ResolveContextYield} */
(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();
},
);
});
}
};