/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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class Storage {
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constructor(duration) {
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this.duration = duration;
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this.running = new Map();
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this.data = new Map();
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this.levels = [];
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if (duration > 0) {
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this.levels.push(
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new Set(),
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new Set(),
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new Set(),
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new Set(),
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new Set(),
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new Set(),
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new Set(),
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new Set(),
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new Set()
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);
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for (let i = 8000; i < duration; i += 500) this.levels.push(new Set());
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}
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this.count = 0;
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this.interval = null;
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this.needTickCheck = false;
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this.nextTick = null;
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this.passive = true;
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this.tick = this.tick.bind(this);
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}
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ensureTick() {
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if (!this.interval && this.duration > 0 && !this.nextTick)
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this.interval = setInterval(
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this.tick,
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Math.floor(this.duration / this.levels.length)
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);
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}
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finished(name, err, result) {
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const callbacks = this.running.get(name);
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this.running.delete(name);
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if (this.duration > 0) {
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this.data.set(name, [err, result]);
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const levelData = this.levels[0];
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this.count -= levelData.size;
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levelData.add(name);
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this.count += levelData.size;
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this.ensureTick();
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}
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for (let i = 0; i < callbacks.length; i++) {
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callbacks[i](err, result);
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}
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}
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finishedSync(name, err, result) {
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if (this.duration > 0) {
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this.data.set(name, [err, result]);
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const levelData = this.levels[0];
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this.count -= levelData.size;
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levelData.add(name);
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this.count += levelData.size;
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this.ensureTick();
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}
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}
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provide(name, provider, callback) {
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if (typeof name !== "string") {
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callback(new TypeError("path must be a string"));
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return;
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}
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let running = this.running.get(name);
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if (running) {
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running.push(callback);
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return;
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}
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if (this.duration > 0) {
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this.checkTicks();
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const data = this.data.get(name);
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if (data) {
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return process.nextTick(() => {
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callback.apply(null, data);
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});
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}
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}
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this.running.set(name, (running = [callback]));
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provider(name, (err, result) => {
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this.finished(name, err, result);
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});
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}
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provideSync(name, provider) {
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if (typeof name !== "string") {
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throw new TypeError("path must be a string");
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}
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if (this.duration > 0) {
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this.checkTicks();
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const data = this.data.get(name);
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if (data) {
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if (data[0]) throw data[0];
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return data[1];
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}
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}
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let result;
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try {
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result = provider(name);
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} catch (e) {
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this.finishedSync(name, e);
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throw e;
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}
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this.finishedSync(name, null, result);
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return result;
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}
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tick() {
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const decay = this.levels.pop();
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for (let item of decay) {
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this.data.delete(item);
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}
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this.count -= decay.size;
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decay.clear();
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this.levels.unshift(decay);
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if (this.count === 0) {
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clearInterval(this.interval);
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this.interval = null;
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this.nextTick = null;
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return true;
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} else if (this.nextTick) {
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this.nextTick += Math.floor(this.duration / this.levels.length);
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const time = new Date().getTime();
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if (this.nextTick > time) {
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this.nextTick = null;
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this.interval = setInterval(
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this.tick,
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Math.floor(this.duration / this.levels.length)
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);
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return true;
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}
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} else if (this.passive) {
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clearInterval(this.interval);
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this.interval = null;
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this.nextTick =
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new Date().getTime() + Math.floor(this.duration / this.levels.length);
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} else {
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this.passive = true;
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}
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}
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checkTicks() {
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this.passive = false;
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if (this.nextTick) {
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while (!this.tick());
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}
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}
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purge(what) {
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if (!what) {
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this.count = 0;
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clearInterval(this.interval);
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this.nextTick = null;
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this.data.clear();
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this.levels.forEach(level => {
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level.clear();
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});
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} else if (typeof what === "string") {
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for (let key of this.data.keys()) {
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if (key.startsWith(what)) this.data.delete(key);
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}
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} else {
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for (let i = what.length - 1; i >= 0; i--) {
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this.purge(what[i]);
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}
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}
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}
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}
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module.exports = class CachedInputFileSystem {
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constructor(fileSystem, duration) {
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this.fileSystem = fileSystem;
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this._statStorage = new Storage(duration);
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this._readdirStorage = new Storage(duration);
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this._readFileStorage = new Storage(duration);
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this._readJsonStorage = new Storage(duration);
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this._readlinkStorage = new Storage(duration);
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this._stat = this.fileSystem.stat
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? this.fileSystem.stat.bind(this.fileSystem)
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: null;
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if (!this._stat) this.stat = null;
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this._statSync = this.fileSystem.statSync
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? this.fileSystem.statSync.bind(this.fileSystem)
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: null;
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if (!this._statSync) this.statSync = null;
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this._readdir = this.fileSystem.readdir
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? this.fileSystem.readdir.bind(this.fileSystem)
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: null;
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if (!this._readdir) this.readdir = null;
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this._readdirSync = this.fileSystem.readdirSync
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? this.fileSystem.readdirSync.bind(this.fileSystem)
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: null;
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if (!this._readdirSync) this.readdirSync = null;
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this._readFile = this.fileSystem.readFile
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? this.fileSystem.readFile.bind(this.fileSystem)
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: null;
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if (!this._readFile) this.readFile = null;
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this._readFileSync = this.fileSystem.readFileSync
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? this.fileSystem.readFileSync.bind(this.fileSystem)
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: null;
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if (!this._readFileSync) this.readFileSync = null;
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if (this.fileSystem.readJson) {
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this._readJson = this.fileSystem.readJson.bind(this.fileSystem);
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} else if (this.readFile) {
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this._readJson = (path, callback) => {
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this.readFile(path, (err, buffer) => {
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if (err) return callback(err);
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let data;
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try {
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data = JSON.parse(buffer.toString("utf-8"));
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} catch (e) {
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return callback(e);
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}
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callback(null, data);
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});
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};
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} else {
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this.readJson = null;
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}
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if (this.fileSystem.readJsonSync) {
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this._readJsonSync = this.fileSystem.readJsonSync.bind(this.fileSystem);
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} else if (this.readFileSync) {
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this._readJsonSync = path => {
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const buffer = this.readFileSync(path);
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const data = JSON.parse(buffer.toString("utf-8"));
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return data;
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};
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} else {
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this.readJsonSync = null;
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}
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this._readlink = this.fileSystem.readlink
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? this.fileSystem.readlink.bind(this.fileSystem)
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: null;
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if (!this._readlink) this.readlink = null;
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this._readlinkSync = this.fileSystem.readlinkSync
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? this.fileSystem.readlinkSync.bind(this.fileSystem)
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: null;
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if (!this._readlinkSync) this.readlinkSync = null;
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}
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stat(path, callback) {
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this._statStorage.provide(path, this._stat, callback);
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}
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readdir(path, callback) {
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this._readdirStorage.provide(path, this._readdir, callback);
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}
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readFile(path, callback) {
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this._readFileStorage.provide(path, this._readFile, callback);
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}
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readJson(path, callback) {
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this._readJsonStorage.provide(path, this._readJson, callback);
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}
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readlink(path, callback) {
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this._readlinkStorage.provide(path, this._readlink, callback);
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}
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statSync(path) {
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return this._statStorage.provideSync(path, this._statSync);
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}
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readdirSync(path) {
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return this._readdirStorage.provideSync(path, this._readdirSync);
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}
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readFileSync(path) {
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return this._readFileStorage.provideSync(path, this._readFileSync);
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}
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readJsonSync(path) {
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return this._readJsonStorage.provideSync(path, this._readJsonSync);
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}
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readlinkSync(path) {
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return this._readlinkStorage.provideSync(path, this._readlinkSync);
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}
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purge(what) {
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this._statStorage.purge(what);
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this._readdirStorage.purge(what);
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this._readFileStorage.purge(what);
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this._readlinkStorage.purge(what);
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this._readJsonStorage.purge(what);
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}
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};
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