diff options
Diffstat (limited to 'node_modules/enhanced-resolve/lib/CachedInputFileSystem.js')
| -rw-r--r-- | node_modules/enhanced-resolve/lib/CachedInputFileSystem.js | 307 |
1 files changed, 307 insertions, 0 deletions
diff --git a/node_modules/enhanced-resolve/lib/CachedInputFileSystem.js b/node_modules/enhanced-resolve/lib/CachedInputFileSystem.js new file mode 100644 index 0000000..9aae0e2 --- /dev/null +++ b/node_modules/enhanced-resolve/lib/CachedInputFileSystem.js @@ -0,0 +1,307 @@ +/* + MIT License http://www.opensource.org/licenses/mit-license.php + Author Tobias Koppers @sokra +*/ +"use strict"; + +class Storage { + constructor(duration) { + this.duration = duration; + this.running = new Map(); + this.data = new Map(); + this.levels = []; + if (duration > 0) { + this.levels.push( + new Set(), + new Set(), + new Set(), + new Set(), + new Set(), + new Set(), + new Set(), + new Set(), + new Set() + ); + for (let i = 8000; i < duration; i += 500) this.levels.push(new Set()); + } + this.count = 0; + this.interval = null; + this.needTickCheck = false; + this.nextTick = null; + this.passive = true; + this.tick = this.tick.bind(this); + } + + ensureTick() { + if (!this.interval && this.duration > 0 && !this.nextTick) + this.interval = setInterval( + this.tick, + Math.floor(this.duration / this.levels.length) + ); + } + + finished(name, err, result) { + const callbacks = this.running.get(name); + this.running.delete(name); + if (this.duration > 0) { + this.data.set(name, [err, result]); + const levelData = this.levels[0]; + this.count -= levelData.size; + levelData.add(name); + this.count += levelData.size; + this.ensureTick(); + } + for (let i = 0; i < callbacks.length; i++) { + callbacks[i](err, result); + } + } + + finishedSync(name, err, result) { + if (this.duration > 0) { + this.data.set(name, [err, result]); + const levelData = this.levels[0]; + this.count -= levelData.size; + levelData.add(name); + this.count += levelData.size; + this.ensureTick(); + } + } + + provide(name, provider, callback) { + if (typeof name !== "string") { + callback(new TypeError("path must be a string")); + return; + } + let running = this.running.get(name); + if (running) { + running.push(callback); + return; + } + if (this.duration > 0) { + this.checkTicks(); + const data = this.data.get(name); + if (data) { + return process.nextTick(() => { + callback.apply(null, data); + }); + } + } + this.running.set(name, (running = [callback])); + provider(name, (err, result) => { + this.finished(name, err, result); + }); + } + + provideSync(name, provider) { + if (typeof name !== "string") { + throw new TypeError("path must be a string"); + } + if (this.duration > 0) { + this.checkTicks(); + const data = this.data.get(name); + if (data) { + if (data[0]) throw data[0]; + return data[1]; + } + } + let result; + try { + result = provider(name); + } catch (e) { + this.finishedSync(name, e); + throw e; + } + this.finishedSync(name, null, result); + return result; + } + + tick() { + const decay = this.levels.pop(); + for (let item of decay) { + this.data.delete(item); + } + this.count -= decay.size; + decay.clear(); + this.levels.unshift(decay); + if (this.count === 0) { + clearInterval(this.interval); + this.interval = null; + this.nextTick = null; + return true; + } else if (this.nextTick) { + this.nextTick += Math.floor(this.duration / this.levels.length); + const time = new Date().getTime(); + if (this.nextTick > time) { + this.nextTick = null; + this.interval = setInterval( + this.tick, + Math.floor(this.duration / this.levels.length) + ); + return true; + } + } else if (this.passive) { + clearInterval(this.interval); + this.interval = null; + this.nextTick = + new Date().getTime() + Math.floor(this.duration / this.levels.length); + } else { + this.passive = true; + } + } + + checkTicks() { + this.passive = false; + if (this.nextTick) { + while (!this.tick()); + } + } + + purge(what) { + if (!what) { + this.count = 0; + clearInterval(this.interval); + this.nextTick = null; + this.data.clear(); + this.levels.forEach(level => { + level.clear(); + }); + } else if (typeof what === "string") { + for (let key of this.data.keys()) { + if (key.startsWith(what)) this.data.delete(key); + } + } else { + for (let i = what.length - 1; i >= 0; i--) { + this.purge(what[i]); + } + } + } +} + +module.exports = class CachedInputFileSystem { + constructor(fileSystem, duration) { + this.fileSystem = fileSystem; + this._statStorage = new Storage(duration); + this._readdirStorage = new Storage(duration); + this._readFileStorage = new Storage(duration); + this._readJsonStorage = new Storage(duration); + this._readlinkStorage = new Storage(duration); + + this._stat = this.fileSystem.stat + ? this.fileSystem.stat.bind(this.fileSystem) + : null; + if (!this._stat) this.stat = null; + + this._statSync = this.fileSystem.statSync + ? this.fileSystem.statSync.bind(this.fileSystem) + : null; + if (!this._statSync) this.statSync = null; + + this._readdir = this.fileSystem.readdir + ? this.fileSystem.readdir.bind(this.fileSystem) + : null; + if (!this._readdir) this.readdir = null; + + this._readdirSync = this.fileSystem.readdirSync + ? this.fileSystem.readdirSync.bind(this.fileSystem) + : null; + if (!this._readdirSync) this.readdirSync = null; + + this._readFile = this.fileSystem.readFile + ? this.fileSystem.readFile.bind(this.fileSystem) + : null; + if (!this._readFile) this.readFile = null; + + this._readFileSync = this.fileSystem.readFileSync + ? this.fileSystem.readFileSync.bind(this.fileSystem) + : null; + if (!this._readFileSync) this.readFileSync = null; + + if (this.fileSystem.readJson) { + this._readJson = this.fileSystem.readJson.bind(this.fileSystem); + } else if (this.readFile) { + this._readJson = (path, callback) => { + this.readFile(path, (err, buffer) => { + if (err) return callback(err); + let data; + try { + data = JSON.parse(buffer.toString("utf-8")); + } catch (e) { + return callback(e); + } + callback(null, data); + }); + }; + } else { + this.readJson = null; + } + if (this.fileSystem.readJsonSync) { + this._readJsonSync = this.fileSystem.readJsonSync.bind(this.fileSystem); + } else if (this.readFileSync) { + this._readJsonSync = path => { + const buffer = this.readFileSync(path); + const data = JSON.parse(buffer.toString("utf-8")); + return data; + }; + } else { + this.readJsonSync = null; + } + + this._readlink = this.fileSystem.readlink + ? this.fileSystem.readlink.bind(this.fileSystem) + : null; + if (!this._readlink) this.readlink = null; + + this._readlinkSync = this.fileSystem.readlinkSync + ? this.fileSystem.readlinkSync.bind(this.fileSystem) + : null; + if (!this._readlinkSync) this.readlinkSync = null; + } + + stat(path, callback) { + this._statStorage.provide(path, this._stat, callback); + } + + readdir(path, callback) { + this._readdirStorage.provide(path, this._readdir, callback); + } + + readFile(path, callback) { + this._readFileStorage.provide(path, this._readFile, callback); + } + + readJson(path, callback) { + this._readJsonStorage.provide(path, this._readJson, callback); + } + + readlink(path, callback) { + this._readlinkStorage.provide(path, this._readlink, callback); + } + + statSync(path) { + return this._statStorage.provideSync(path, this._statSync); + } + + readdirSync(path) { + return this._readdirStorage.provideSync(path, this._readdirSync); + } + + readFileSync(path) { + return this._readFileStorage.provideSync(path, this._readFileSync); + } + + readJsonSync(path) { + return this._readJsonStorage.provideSync(path, this._readJsonSync); + } + + readlinkSync(path) { + return this._readlinkStorage.provideSync(path, this._readlinkSync); + } + + purge(what) { + this._statStorage.purge(what); + this._readdirStorage.purge(what); + this._readFileStorage.purge(what); + this._readlinkStorage.purge(what); + this._readJsonStorage.purge(what); + } +}; |