1 | ;
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2 | Object.defineProperty(exports, "__esModule", { value: true });
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3 | exports.caches = exports.PersistentCache = void 0;
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4 | const fs_extra_1 = require("fs-extra");
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5 | const os_1 = require("os");
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6 | const path_1 = require("path");
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7 | const uuid_1 = require("uuid");
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8 | /**
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9 | * A simple persistent key-value store. Used to implement {@link Limits.cache}
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10 | * for {@link throttle}.
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11 | * @remarks
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12 | * Entries can be expired, but are not actually deleted individually. The entire
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13 | * cache can be deleted at once. Hence this cache is useful for storing results
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14 | * that are expensive to compute but do not change too often (e.g. the
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15 | * node_modules folder from an 'npm install' where 'package.json' is not
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16 | * expected to change too often).
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17 | *
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18 | * By default faast.js will use the directory `~/.faastjs` as a local cache to
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19 | * store data such as pricing retrieved from cloud APIs, and garbage collection
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20 | * information. This directory can be safely deleted if no faast.js instances
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21 | * are running.
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22 | * @public
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23 | */
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24 | class PersistentCache {
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25 | /**
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26 | * Construct a new persistent cache, typically used with {@link Limits} as
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27 | * part of the arguments to {@link throttle}.
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28 | * @param dirRelativeToHomeDir - The directory under the user's home
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29 | * directory that will be used to store cached values. The directory will be
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30 | * created if it doesn't exist.
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31 | * @param expiration - The age (in ms) after which a cached entry is
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32 | * invalid. Default: `24*3600*1000` (1 day).
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33 | */
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34 | constructor(
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35 | /**
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36 | * The directory under the user's home directory that will be used to
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37 | * store cached values. The directory will be created if it doesn't
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38 | * exist.
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39 | */
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40 | dirRelativeToHomeDir,
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41 | /**
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42 | * The age (in ms) after which a cached entry is invalid. Default:
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43 | * `24*3600*1000` (1 day).
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44 | */
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45 | expiration = 24 * 3600 * 1000) {
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46 | this.dirRelativeToHomeDir = dirRelativeToHomeDir;
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47 | this.expiration = expiration;
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48 | this.dir = (0, path_1.join)((0, os_1.homedir)(), dirRelativeToHomeDir);
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49 | this.initialized = this.initialize(this.dir);
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50 | }
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51 | async initialize(dir) {
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52 | if (!(await (0, fs_extra_1.pathExists)(dir))) {
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53 | await (0, fs_extra_1.mkdirp)(dir);
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54 | }
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55 | }
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56 | /**
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57 | * Retrieves the value previously set for the given key, or undefined if the
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58 | * key is not found.
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59 | */
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60 | async get(key) {
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61 | await this.initialized;
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62 | const entry = (0, path_1.join)(this.dir, key);
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63 | const statEntry = await (0, fs_extra_1.stat)(entry).catch(_ => { });
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64 | if (statEntry) {
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65 | if (Date.now() - statEntry.mtimeMs > this.expiration) {
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66 | return undefined;
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67 | }
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68 | return (0, fs_extra_1.readFile)(entry).catch(_ => undefined);
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69 | }
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70 | return undefined;
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71 | }
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72 | /**
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73 | * Set the cache key to the given value.
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74 | * @returns a Promise that resolves when the cache entry has been persisted.
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75 | */
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76 | async set(key, value) {
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77 | await this.initialized;
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78 | const entry = (0, path_1.join)(this.dir, key);
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79 | const tmpEntry = (0, path_1.join)(this.dir, (0, uuid_1.v4)());
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80 | await (0, fs_extra_1.writeFile)(tmpEntry, value, { mode: 0o600, encoding: "binary" });
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81 | await (0, fs_extra_1.rename)(tmpEntry, entry);
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82 | }
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83 | /**
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84 | * Retrieve all keys stored in the cache, including expired entries.
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85 | */
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86 | entries() {
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87 | return (0, fs_extra_1.readdir)(this.dir);
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88 | }
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89 | /**
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90 | * Deletes all cached entries from disk.
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91 | * @param leaveEmptyDir - If true, leave the cache directory in place after
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92 | * deleting its contents. If false, the cache directory will be removed.
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93 | * Default: `true`.
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94 | */
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95 | async clear({ leaveEmptyDir = true } = {}) {
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96 | await this.initialized;
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97 | await (0, fs_extra_1.remove)(this.dir);
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98 | if (leaveEmptyDir) {
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99 | await (0, fs_extra_1.mkdirp)(this.dir);
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100 | }
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101 | }
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102 | }
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103 | exports.PersistentCache = PersistentCache;
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104 | const days = 24 * 3600 * 1000;
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105 | exports.caches = {
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106 | awsPrices: new PersistentCache(".faastjs/aws/pricing", 1 * days),
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107 | googlePrices: new PersistentCache(".faastjs/google/pricing", 1 * days),
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108 | awsGc: new PersistentCache(".faastjs/aws/gc", 7 * days)
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109 | };
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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    /**\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, 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 | Readable | Blob) {\n        await this.initialized;\n        const entry = join(this.dir, 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    googlePrices: new PersistentCache(\".faastjs/google/pricing\", 1 * days),\n    awsGc: new PersistentCache(\".faastjs/aws/gc\", 7 * days)\n};\n"]} |
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