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Merge pull request #420 from Hellysonrp/mutex
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commit
d8fc7d39e1
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@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
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and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
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## [Unreleased]
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### Fixed
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- Fixes a race condition in the file cache service (see #420)
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## [0.1.0]
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### Added
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@ -63,7 +63,8 @@
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"new-cap": "off",
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"@typescript-eslint/no-unused-vars": "off",
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"@typescript-eslint/no-unused-vars-experimental": "error",
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"@typescript-eslint/prefer-readonly-parameter-types": "off"
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"@typescript-eslint/prefer-readonly-parameter-types": "off",
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"@typescript-eslint/no-implicit-any-catch": "off"
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}
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},
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"husky": {
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@ -5,9 +5,12 @@ import sequelize from 'sequelize';
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import {FileCache} from '../models/index.js';
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import {TYPES} from '../types.js';
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import Config from './config.js';
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import PQueue from 'p-queue';
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import debug from '../utils/debug.js';
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@injectable()
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export default class FileCacheProvider {
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private static readonly evictionQueue = new PQueue({concurrency: 1});
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private readonly config: Config;
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constructor(@inject(TYPES.Config) config: Config) {
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@ -58,10 +61,14 @@ export default class FileCacheProvider {
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const stats = await fs.stat(tmpPath);
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if (stats.size !== 0) {
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await fs.rename(tmpPath, finalPath);
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}
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try {
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await fs.rename(tmpPath, finalPath);
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await FileCache.create({hash, bytes: stats.size, accessedAt: new Date()});
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await FileCache.create({hash, bytes: stats.size, accessedAt: new Date()});
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} catch (error) {
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debug('Errored when moving a finished cache file:', error);
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}
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}
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await this.evictOldestIfNecessary();
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});
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@ -80,13 +87,19 @@ export default class FileCacheProvider {
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}
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private async evictOldestIfNecessary() {
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const [{dataValues: {totalSizeBytes}}] = await FileCache.findAll({
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attributes: [
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[sequelize.fn('sum', sequelize.col('bytes')), 'totalSizeBytes'],
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],
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}) as unknown as [{dataValues: {totalSizeBytes: number}}];
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void FileCacheProvider.evictionQueue.add(this.evictOldest.bind(this));
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if (totalSizeBytes > this.config.CACHE_LIMIT_IN_BYTES) {
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return FileCacheProvider.evictionQueue.onEmpty();
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}
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private async evictOldest() {
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debug('Evicting oldest files...');
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let totalSizeBytes = await this.getDiskUsageInBytes();
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let numOfEvictedFiles = 0;
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// Continue to evict until we're under the limit
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/* eslint-disable no-await-in-loop */
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while (totalSizeBytes > this.config.CACHE_LIMIT_IN_BYTES) {
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const oldest = await FileCache.findOne({
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order: [
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['accessedAt', 'ASC'],
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@ -96,22 +109,111 @@ export default class FileCacheProvider {
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if (oldest) {
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await oldest.destroy();
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await fs.unlink(path.join(this.config.CACHE_DIR, oldest.hash));
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debug(`${oldest.hash} has been evicted`);
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numOfEvictedFiles++;
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}
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// Continue to evict until we're under the limit
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await this.evictOldestIfNecessary();
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totalSizeBytes = await this.getDiskUsageInBytes();
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}
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/* eslint-enable no-await-in-loop */
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if (numOfEvictedFiles > 0) {
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debug(`${numOfEvictedFiles} files have been evicted`);
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} else {
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debug(`No files needed to be evicted. Total size of the cache is currently ${totalSizeBytes} bytes, and the cache limit is ${this.config.CACHE_LIMIT_IN_BYTES} bytes.`);
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}
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}
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private async removeOrphans() {
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// Check filesystem direction (do files exist on the disk but not in the database?)
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for await (const dirent of await fs.opendir(this.config.CACHE_DIR)) {
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if (dirent.isFile()) {
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const model = await FileCache.findByPk(dirent.name);
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if (!model) {
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debug(`${dirent.name} was present on disk but was not in the database. Removing from disk.`);
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await fs.unlink(path.join(this.config.CACHE_DIR, dirent.name));
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}
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}
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}
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// Check database direction (do entries exist in the database but not on the disk?)
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for await (const model of this.getFindAllIterable()) {
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const filePath = path.join(this.config.CACHE_DIR, model.hash);
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try {
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await fs.access(filePath);
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} catch {
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debug(`${model.hash} was present in database but was not on disk. Removing from database.`);
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await model.destroy();
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}
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}
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}
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/**
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* Pulls from the database rather than the filesystem,
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* so may be slightly inaccurate.
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* @returns the total size of the cache in bytes
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*/
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private async getDiskUsageInBytes() {
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const [{dataValues: {totalSizeBytes}}] = await FileCache.findAll({
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attributes: [
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[sequelize.fn('sum', sequelize.col('bytes')), 'totalSizeBytes'],
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],
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}) as unknown as [{dataValues: {totalSizeBytes: number}}];
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return totalSizeBytes;
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}
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/**
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* An efficient way to iterate over all rows.
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* @returns an iterable for the result of FileCache.findAll()
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*/
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private getFindAllIterable() {
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const limit = 50;
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let previousCreatedAt: Date | null = null;
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let models: FileCache[] = [];
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const fetchNextBatch = async () => {
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let where = {};
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if (previousCreatedAt) {
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where = {
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createdAt: {
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[sequelize.Op.gt]: previousCreatedAt,
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},
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};
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}
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models = await FileCache.findAll({
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where,
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limit,
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order: ['createdAt'],
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});
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if (models.length > 0) {
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previousCreatedAt = models[models.length - 1].createdAt as Date;
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}
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};
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return {
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[Symbol.asyncIterator]() {
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return {
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async next() {
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if (models.length === 0) {
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await fetchNextBatch();
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}
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if (models.length === 0) {
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// Must return value here for types to be inferred correctly
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return {done: true, value: null as unknown as FileCache};
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}
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return {value: models.shift()!, done: false};
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},
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};
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},
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};
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}
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}
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