260 lines
6.4 KiB
Plaintext
260 lines
6.4 KiB
Plaintext
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'use strict';
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const EventEmitter = require('events');
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const JSONB = require('json-buffer');
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const loadStore = options => {
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const adapters = {
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redis: '@keyv/redis',
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rediss: '@keyv/redis',
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mongodb: '@keyv/mongo',
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mongo: '@keyv/mongo',
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sqlite: '@keyv/sqlite',
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postgresql: '@keyv/postgres',
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postgres: '@keyv/postgres',
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mysql: '@keyv/mysql',
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etcd: '@keyv/etcd',
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offline: '@keyv/offline',
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tiered: '@keyv/tiered',
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};
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if (options.adapter || options.uri) {
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const adapter = options.adapter || /^[^:+]*/.exec(options.uri)[0];
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return new (require(adapters[adapter]))(options);
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}
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return new Map();
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};
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const iterableAdapters = [
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'sqlite',
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'postgres',
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'mysql',
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'mongo',
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'redis',
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'tiered',
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];
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class Keyv extends EventEmitter {
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constructor(uri, {emitErrors = true, ...options} = {}) {
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super();
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this.opts = {
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namespace: 'keyv',
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serialize: JSONB.stringify,
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deserialize: JSONB.parse,
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...((typeof uri === 'string') ? {uri} : uri),
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...options,
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};
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if (!this.opts.store) {
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const adapterOptions = {...this.opts};
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this.opts.store = loadStore(adapterOptions);
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}
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if (this.opts.compression) {
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const compression = this.opts.compression;
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this.opts.serialize = compression.serialize.bind(compression);
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this.opts.deserialize = compression.deserialize.bind(compression);
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}
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if (typeof this.opts.store.on === 'function' && emitErrors) {
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this.opts.store.on('error', error => this.emit('error', error));
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}
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this.opts.store.namespace = this.opts.namespace;
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const generateIterator = iterator => async function * () {
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for await (const [key, raw] of typeof iterator === 'function'
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? iterator(this.opts.store.namespace)
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: iterator) {
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const data = await this.opts.deserialize(raw);
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if (this.opts.store.namespace && !key.includes(this.opts.store.namespace)) {
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continue;
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}
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if (typeof data.expires === 'number' && Date.now() > data.expires) {
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this.delete(key);
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continue;
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}
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yield [this._getKeyUnprefix(key), data.value];
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}
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};
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// Attach iterators
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if (typeof this.opts.store[Symbol.iterator] === 'function' && this.opts.store instanceof Map) {
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this.iterator = generateIterator(this.opts.store);
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} else if (typeof this.opts.store.iterator === 'function' && this.opts.store.opts
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&& this._checkIterableAdaptar()) {
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this.iterator = generateIterator(this.opts.store.iterator.bind(this.opts.store));
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}
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}
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_checkIterableAdaptar() {
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return iterableAdapters.includes(this.opts.store.opts.dialect)
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|| iterableAdapters.findIndex(element => this.opts.store.opts.url.includes(element)) >= 0;
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}
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_getKeyPrefix(key) {
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return `${this.opts.namespace}:${key}`;
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}
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_getKeyPrefixArray(keys) {
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return keys.map(key => `${this.opts.namespace}:${key}`);
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}
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_getKeyUnprefix(key) {
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return key
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.split(':')
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.splice(1)
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.join(':');
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}
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get(key, options) {
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const {store} = this.opts;
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const isArray = Array.isArray(key);
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const keyPrefixed = isArray ? this._getKeyPrefixArray(key) : this._getKeyPrefix(key);
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if (isArray && store.getMany === undefined) {
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const promises = [];
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for (const key of keyPrefixed) {
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promises.push(Promise.resolve()
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.then(() => store.get(key))
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.then(data => (typeof data === 'string') ? this.opts.deserialize(data) : (this.opts.compression ? this.opts.deserialize(data) : data))
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.then(data => {
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if (data === undefined || data === null) {
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return undefined;
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}
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if (typeof data.expires === 'number' && Date.now() > data.expires) {
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return this.delete(key).then(() => undefined);
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}
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return (options && options.raw) ? data : data.value;
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}),
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);
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}
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return Promise.allSettled(promises)
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.then(values => {
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const data = [];
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for (const value of values) {
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data.push(value.value);
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}
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return data;
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});
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}
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return Promise.resolve()
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.then(() => isArray ? store.getMany(keyPrefixed) : store.get(keyPrefixed))
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.then(data => (typeof data === 'string') ? this.opts.deserialize(data) : (this.opts.compression ? this.opts.deserialize(data) : data))
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.then(data => {
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if (data === undefined || data === null) {
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return undefined;
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}
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if (isArray) {
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return data.map((row, index) => {
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if ((typeof row === 'string')) {
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row = this.opts.deserialize(row);
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}
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if (row === undefined || row === null) {
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return undefined;
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}
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if (typeof row.expires === 'number' && Date.now() > row.expires) {
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this.delete(key[index]).then(() => undefined);
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return undefined;
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}
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return (options && options.raw) ? row : row.value;
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});
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}
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if (typeof data.expires === 'number' && Date.now() > data.expires) {
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return this.delete(key).then(() => undefined);
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}
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return (options && options.raw) ? data : data.value;
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});
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}
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set(key, value, ttl) {
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const keyPrefixed = this._getKeyPrefix(key);
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if (typeof ttl === 'undefined') {
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ttl = this.opts.ttl;
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}
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if (ttl === 0) {
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ttl = undefined;
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}
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const {store} = this.opts;
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return Promise.resolve()
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.then(() => {
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const expires = (typeof ttl === 'number') ? (Date.now() + ttl) : null;
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if (typeof value === 'symbol') {
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this.emit('error', 'symbol cannot be serialized');
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}
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value = {value, expires};
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return this.opts.serialize(value);
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})
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.then(value => store.set(keyPrefixed, value, ttl))
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.then(() => true);
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}
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delete(key) {
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const {store} = this.opts;
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if (Array.isArray(key)) {
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const keyPrefixed = this._getKeyPrefixArray(key);
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if (store.deleteMany === undefined) {
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const promises = [];
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for (const key of keyPrefixed) {
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promises.push(store.delete(key));
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}
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return Promise.allSettled(promises)
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.then(values => values.every(x => x.value === true));
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}
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return Promise.resolve()
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.then(() => store.deleteMany(keyPrefixed));
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}
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const keyPrefixed = this._getKeyPrefix(key);
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return Promise.resolve()
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.then(() => store.delete(keyPrefixed));
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}
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clear() {
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const {store} = this.opts;
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return Promise.resolve()
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.then(() => store.clear());
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}
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has(key) {
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const keyPrefixed = this._getKeyPrefix(key);
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const {store} = this.opts;
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return Promise.resolve()
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.then(async () => {
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if (typeof store.has === 'function') {
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return store.has(keyPrefixed);
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}
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const value = await store.get(keyPrefixed);
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return value !== undefined;
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});
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}
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disconnect() {
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const {store} = this.opts;
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if (typeof store.disconnect === 'function') {
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return store.disconnect();
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}
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}
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}
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module.exports = Keyv;
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