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faastjs

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Serverless batch computing made simple.

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"use strict"; Object.defineProperty(exports, "__esModule", { value: true }); exports.caches = exports.PersistentCache = void 0; const fs_extra_1 = require("fs-extra"); const os_1 = require("os"); const path_1 = require("path"); const uuid_1 = require("uuid"); const crypto_1 = require("crypto"); /** * A simple persistent key-value store. Used to implement {@link Limits.cache} * for {@link throttle}. * @remarks * Entries can be expired, but are not actually deleted individually. The entire * cache can be deleted at once. Hence this cache is useful for storing results * that are expensive to compute but do not change too often (e.g. the * node_modules folder from an 'npm install' where 'package.json' is not * expected to change too often). * * By default faast.js will use the directory `~/.faastjs` as a local cache to * store data such as pricing retrieved from cloud APIs, and garbage collection * information. This directory can be safely deleted if no faast.js instances * are running. * @public */ class PersistentCache { async initialize(dir) { if (!(await (0, fs_extra_1.pathExists)(dir))) { await (0, fs_extra_1.mkdirp)(dir); } } /** * Construct a new persistent cache, typically used with {@link Limits} as * part of the arguments to {@link throttle}. * @param dirRelativeToHomeDir - The directory under the user's home * directory that will be used to store cached values. The directory will be * created if it doesn't exist. * @param expiration - The age (in ms) after which a cached entry is * invalid. Default: `24*3600*1000` (1 day). */ constructor( /** * The directory under the user's home directory that will be used to * store cached values. The directory will be created if it doesn't * exist. */ dirRelativeToHomeDir, /** * The age (in ms) after which a cached entry is invalid. Default: * `24*3600*1000` (1 day). */ expiration = 24 * 3600 * 1000) { this.dirRelativeToHomeDir = dirRelativeToHomeDir; this.expiration = expiration; this.dir = (0, path_1.join)((0, os_1.homedir)(), dirRelativeToHomeDir); this.initialized = this.initialize(this.dir); } hash(key) { const hasher = (0, crypto_1.createHash)("sha256"); hasher.update(key); return hasher.digest("hex"); } /** * Retrieves the value previously set for the given key, or undefined if the * key is not found. */ async get(key) { await this.initialized; const entry = (0, path_1.join)(this.dir, this.hash(key)); const statEntry = await (0, fs_extra_1.stat)(entry).catch(_ => { }); if (statEntry) { if (Date.now() - statEntry.mtimeMs > this.expiration) { return undefined; } return (0, fs_extra_1.readFile)(entry).catch(_ => undefined); } return undefined; } /** * Set the cache key to the given value. * @returns a Promise that resolves when the cache entry has been persisted. */ async set(key, value) { await this.initialized; const entry = (0, path_1.join)(this.dir, this.hash(key)); const tmpEntry = (0, path_1.join)(this.dir, (0, uuid_1.v4)()); await (0, fs_extra_1.writeFile)(tmpEntry, value, { mode: 0o600, encoding: "binary" }); await (0, fs_extra_1.rename)(tmpEntry, entry); } /** * Retrieve all keys stored in the cache, including expired entries. */ entries() { return (0, fs_extra_1.readdir)(this.dir); } /** * Deletes all cached entries from disk. * @param leaveEmptyDir - If true, leave the cache directory in place after * deleting its contents. If false, the cache directory will be removed. * Default: `true`. */ async clear({ leaveEmptyDir = true } = {}) { await this.initialized; await (0, fs_extra_1.remove)(this.dir); if (leaveEmptyDir) { await (0, fs_extra_1.mkdirp)(this.dir); } } } exports.PersistentCache = PersistentCache; const days = 24 * 3600 * 1000; exports.caches = { awsPrices: new PersistentCache(".faastjs/aws/pricing", 1 * days), awsGc: new PersistentCache(".faastjs/aws/gc", 7 * days) }; //# sourceMappingURL=data:application/json;base64,{"version":3,"file":"cache.js","sourceRoot":"","sources":["../../src/cache.ts"],"names":[],"mappings":";;;AAAA,uCASkB;AAClB,2BAA6B;AAC7B,+BAA4B;AAE5B,+BAAoC;AACpC,mCAAoC;AAIpC;;;;;;;;;;;;;;;GAeG;AACH,MAAa,eAAe;IAGhB,KAAK,CAAC,UAAU,CAAC,GAAW;QAChC,IAAI,CAAC,CAAC,MAAM,IAAA,qBAAU,EAAC,GAAG,CAAC,CAAC,EAAE;YAC1B,MAAM,IAAA,iBAAM,EAAC,GAAG,CAAC,CAAC;SACrB;IACL,CAAC;IAOD;;;;;;;;OAQG;IACH;IACI;;;;OAIG;IACM,oBAA4B;IACrC;;;OAGG;IACM,aAAqB,EAAE,GAAG,IAAI,GAAG,IAAI;QALrC,yBAAoB,GAApB,oBAAoB,CAAQ;QAK5B,eAAU,GAAV,UAAU,CAA2B;QAE9C,IAAI,CAAC,GAAG,GAAG,IAAA,WAAI,EAAC,IAAA,YAAO,GAAE,EAAE,oBAAoB,CAAC,CAAC;QACjD,IAAI,CAAC,WAAW,GAAG,IAAI,CAAC,UAAU,CAAC,IAAI,CAAC,GAAG,CAAC,CAAC;IACjD,CAAC;IAEO,IAAI,CAAC,GAAW;QACpB,MAAM,MAAM,GAAG,IAAA,mBAAU,EAAC,QAAQ,CAAC,CAAC;QACpC,MAAM,CAAC,MAAM,CAAC,GAAG,CAAC,CAAC;QACnB,OAAO,MAAM,CAAC,MAAM,CAAC,KAAK,CAAC,CAAC;IAChC,CAAC;IAED;;;OAGG;IACH,KAAK,CAAC,GAAG,CAAC,GAAW;QACjB,MAAM,IAAI,CAAC,WAAW,CAAC;QACvB,MAAM,KAAK,GAAG,IAAA,WAAI,EAAC,IAAI,CAAC,GAAG,EAAE,IAAI,CAAC,IAAI,CAAC,GAAG,CAAC,CAAC,CAAC;QAC7C,MAAM,SAAS,GAAG,MAAM,IAAA,eAAI,EAAC,KAAK,CAAC,CAAC,KAAK,CAAC,CAAC,CAAC,EAAE,GAAE,CAAC,CAAC,CAAC;QACnD,IAAI,SAAS,EAAE;YACX,IAAI,IAAI,CAAC,GAAG,EAAE,GAAG,SAAS,CAAC,OAAO,GAAG,IAAI,CAAC,UAAU,EAAE;gBAClD,OAAO,SAAS,CAAC;aACpB;YACD,OAAO,IAAA,mBAAQ,EAAC,KAAK,CAAC,CAAC,KAAK,CAAC,CAAC,CAAC,EAAE,CAAC,SAAS,CAAC,CAAC;SAChD;QACD,OAAO,SAAS,CAAC;IACrB,CAAC;IAED;;;OAGG;IACH,KAAK,CAAC,GAAG,CAAC,GAAW,EAAE,KAAmC;QACtD,MAAM,IAAI,CAAC,WAAW,CAAC;QACvB,MAAM,KAAK,GAAG,IAAA,WAAI,EAAC,IAAI,CAAC,GAAG,EAAE,IAAI,CAAC,IAAI,CAAC,GAAG,CAAC,CAAC,CAAC;QAC7C,MAAM,QAAQ,GAAG,IAAA,WAAI,EAAC,IAAI,CAAC,GAAG,EAAE,IAAA,SAAM,GAAE,CAAC,CAAC;QAC1C,MAAM,IAAA,oBAAS,EAAC,QAAQ,EAAE,KAAK,EAAE,EAAE,IAAI,EAAE,KAAK,EAAE,QAAQ,EAAE,QAAQ,EAAE,CAAC,CAAC;QACtE,MAAM,IAAA,iBAAM,EAAC,QAAQ,EAAE,KAAK,CAAC,CAAC;IAClC,CAAC;IAED;;OAEG;IACH,OAAO;QACH,OAAO,IAAA,kBAAO,EAAC,IAAI,CAAC,GAAG,CAAC,CAAC;IAC7B,CAAC;IAED;;;;;OAKG;IACH,KAAK,CAAC,KAAK,CAAC,EAAE,aAAa,GAAG,IAAI,EAAE,GAAG,EAAE;QACrC,MAAM,IAAI,CAAC,WAAW,CAAC;QAEvB,MAAM,IAAA,iBAAM,EAAC,IAAI,CAAC,GAAG,CAAC,CAAC;QAEvB,IAAI,aAAa,EAAE;YACf,MAAM,IAAA,iBAAM,EAAC,IAAI,CAAC,GAAG,CAAC,CAAC;SAC1B;IACL,CAAC;CACJ;AAjGD,0CAiGC;AAED,MAAM,IAAI,GAAG,EAAE,GAAG,IAAI,GAAG,IAAI,CAAC;AAEjB,QAAA,MAAM,GAAG;IAClB,SAAS,EAAE,IAAI,eAAe,CAAC,sBAAsB,EAAE,CAAC,GAAG,IAAI,CAAC;IAChE,KAAK,EAAE,IAAI,eAAe,CAAC,iBAAiB,EAAE,CAAC,GAAG,IAAI,CAAC;CAC1D,CAAC","sourcesContent":["import {\n    mkdirp,\n    pathExists,\n    readdir,\n    readFile,\n    remove,\n    rename,\n    stat,\n    writeFile\n} from \"fs-extra\";\nimport { homedir } from \"os\";\nimport { join } from \"path\";\nimport { Readable } from \"stream\";\nimport { v4 as uuidv4 } from \"uuid\";\nimport { createHash } from \"crypto\";\n\ninterface Blob {}\n\n/**\n * A simple persistent key-value store. Used to implement {@link Limits.cache}\n * for {@link throttle}.\n * @remarks\n * Entries can be expired, but are not actually deleted individually. The entire\n * cache can be deleted at once. Hence this cache is useful for storing results\n * that are expensive to compute but do not change too often (e.g. the\n * node_modules folder from an 'npm install' where 'package.json' is not\n * expected to change too often).\n *\n * By default faast.js will use the directory `~/.faastjs` as a local cache to\n * store data such as pricing retrieved from cloud APIs, and garbage collection\n * information. This directory can be safely deleted if no faast.js instances\n * are running.\n * @public\n */\nexport class PersistentCache {\n    private initialized: Promise<void>;\n\n    private async initialize(dir: string) {\n        if (!(await pathExists(dir))) {\n            await mkdirp(dir);\n        }\n    }\n\n    /**\n     * The directory on disk where cached values are stored.\n     */\n    readonly dir: string;\n\n    /**\n     * Construct a new persistent cache, typically used with {@link Limits} as\n     * part of the arguments to {@link throttle}.\n     * @param dirRelativeToHomeDir - The directory under the user's home\n     * directory that will be used to store cached values. The directory will be\n     * created if it doesn't exist.\n     * @param expiration - The age (in ms) after which a cached entry is\n     * invalid. Default: `24*3600*1000` (1 day).\n     */\n    constructor(\n        /**\n         * The directory under the user's home directory that will be used to\n         * store cached values. The directory will be created if it doesn't\n         * exist.\n         */\n        readonly dirRelativeToHomeDir: string,\n        /**\n         * The age (in ms) after which a cached entry is invalid. Default:\n         * `24*3600*1000` (1 day).\n         */\n        readonly expiration: number = 24 * 3600 * 1000\n    ) {\n        this.dir = join(homedir(), dirRelativeToHomeDir);\n        this.initialized = this.initialize(this.dir);\n    }\n\n    private hash(key: string) {\n        const hasher = createHash(\"sha256\");\n        hasher.update(key);\n        return hasher.digest(\"hex\");\n    }\n\n    /**\n     * Retrieves the value previously set for the given key, or undefined if the\n     * key is not found.\n     */\n    async get(key: string) {\n        await this.initialized;\n        const entry = join(this.dir, this.hash(key));\n        const statEntry = await stat(entry).catch(_ => {});\n        if (statEntry) {\n            if (Date.now() - statEntry.mtimeMs > this.expiration) {\n                return undefined;\n            }\n            return readFile(entry).catch(_ => undefined);\n        }\n        return undefined;\n    }\n\n    /**\n     * Set the cache key to the given value.\n     * @returns a Promise that resolves when the cache entry has been persisted.\n     */\n    async set(key: string, value: Buffer | string | Uint8Array) {\n        await this.initialized;\n        const entry = join(this.dir, this.hash(key));\n        const tmpEntry = join(this.dir, uuidv4());\n        await writeFile(tmpEntry, value, { mode: 0o600, encoding: \"binary\" });\n        await rename(tmpEntry, entry);\n    }\n\n    /**\n     * Retrieve all keys stored in the cache, including expired entries.\n     */\n    entries() {\n        return readdir(this.dir);\n    }\n\n    /**\n     * Deletes all cached entries from disk.\n     * @param leaveEmptyDir - If true, leave the cache directory in place after\n     * deleting its contents. If false, the cache directory will be removed.\n     * Default: `true`.\n     */\n    async clear({ leaveEmptyDir = true } = {}) {\n        await this.initialized;\n\n        await remove(this.dir);\n\n        if (leaveEmptyDir) {\n            await mkdirp(this.dir);\n        }\n    }\n}\n\nconst days = 24 * 3600 * 1000;\n\nexport const caches = {\n    awsPrices: new PersistentCache(\".faastjs/aws/pricing\", 1 * days),\n    awsGc: new PersistentCache(\".faastjs/aws/gc\", 7 * days)\n};\n"]}