source: imaps-frontend/node_modules/keyv/src/index.js@ 0c6b92a

'use strict';

const EventEmitter = require('events');
const JSONB = require('json-buffer');

const loadStore = options => {
        const adapters = {
                redis: '@keyv/redis',
                rediss: '@keyv/redis',
                mongodb: '@keyv/mongo',
                mongo: '@keyv/mongo',
                sqlite: '@keyv/sqlite',
                postgresql: '@keyv/postgres',
                postgres: '@keyv/postgres',
                mysql: '@keyv/mysql',
                etcd: '@keyv/etcd',
                offline: '@keyv/offline',
                tiered: '@keyv/tiered',
        };
        if (options.adapter || options.uri) {
                const adapter = options.adapter || /^[^:+]*/.exec(options.uri)[0];
                return new (require(adapters[adapter]))(options);
        }

        return new Map();
};

const iterableAdapters = [
        'sqlite',
        'postgres',
        'mysql',
        'mongo',
        'redis',
        'tiered',
];

class Keyv extends EventEmitter {
        constructor(uri, {emitErrors = true, ...options} = {}) {
                super();
                this.opts = {
                        namespace: 'keyv',
                        serialize: JSONB.stringify,
                        deserialize: JSONB.parse,
                        ...((typeof uri === 'string') ? {uri} : uri),
                        ...options,
                };

                if (!this.opts.store) {
                        const adapterOptions = {...this.opts};
                        this.opts.store = loadStore(adapterOptions);
                }

                if (this.opts.compression) {
                        const compression = this.opts.compression;
                        this.opts.serialize = compression.serialize.bind(compression);
                        this.opts.deserialize = compression.deserialize.bind(compression);
                }

                if (typeof this.opts.store.on === 'function' && emitErrors) {
                        this.opts.store.on('error', error => this.emit('error', error));
                }

                this.opts.store.namespace = this.opts.namespace;

                const generateIterator = iterator => async function * () {
                        for await (const [key, raw] of typeof iterator === 'function'
                                ? iterator(this.opts.store.namespace)
                                : iterator) {
                                const data = await this.opts.deserialize(raw);
                                if (this.opts.store.namespace && !key.includes(this.opts.store.namespace)) {
                                        continue;
                                }

                                if (typeof data.expires === 'number' && Date.now() > data.expires) {
                                        this.delete(key);
                                        continue;
                                }

                                yield [this._getKeyUnprefix(key), data.value];
                        }
                };

                // Attach iterators
                if (typeof this.opts.store[Symbol.iterator] === 'function' && this.opts.store instanceof Map) {
                        this.iterator = generateIterator(this.opts.store);
                } else if (typeof this.opts.store.iterator === 'function' && this.opts.store.opts
                        && this._checkIterableAdaptar()) {
                        this.iterator = generateIterator(this.opts.store.iterator.bind(this.opts.store));
                }
        }

        _checkIterableAdaptar() {
                return iterableAdapters.includes(this.opts.store.opts.dialect)
                        || iterableAdapters.findIndex(element => this.opts.store.opts.url.includes(element)) >= 0;
        }

        _getKeyPrefix(key) {
                return `${this.opts.namespace}:${key}`;
        }

        _getKeyPrefixArray(keys) {
                return keys.map(key => `${this.opts.namespace}:${key}`);
        }

        _getKeyUnprefix(key) {
                return key
                        .split(':')
                        .splice(1)
                        .join(':');
        }

        get(key, options) {
                const {store} = this.opts;
                const isArray = Array.isArray(key);
                const keyPrefixed = isArray ? this._getKeyPrefixArray(key) : this._getKeyPrefix(key);
                if (isArray && store.getMany === undefined) {
                        const promises = [];
                        for (const key of keyPrefixed) {
                                promises.push(Promise.resolve()
                                        .then(() => store.get(key))
                                        .then(data => (typeof data === 'string') ? this.opts.deserialize(data) : (this.opts.compression ? this.opts.deserialize(data) : data))
                                        .then(data => {
                                                if (data === undefined || data === null) {
                                                        return undefined;
                                                }

                                                if (typeof data.expires === 'number' && Date.now() > data.expires) {
                                                        return this.delete(key).then(() => undefined);
                                                }

                                                return (options && options.raw) ? data : data.value;
                                        }),
                                );
                        }

                        return Promise.allSettled(promises)
                                .then(values => {
                                        const data = [];
                                        for (const value of values) {
                                                data.push(value.value);
                                        }

                                        return data;
                                });
                }

                return Promise.resolve()
                        .then(() => isArray ? store.getMany(keyPrefixed) : store.get(keyPrefixed))
                        .then(data => (typeof data === 'string') ? this.opts.deserialize(data) : (this.opts.compression ? this.opts.deserialize(data) : data))
                        .then(data => {
                                if (data === undefined || data === null) {
                                        return undefined;
                                }

                                if (isArray) {
                                        return data.map((row, index) => {
                                                if ((typeof row === 'string')) {
                                                        row = this.opts.deserialize(row);
                                                }

                                                if (row === undefined || row === null) {
                                                        return undefined;
                                                }

                                                if (typeof row.expires === 'number' && Date.now() > row.expires) {
                                                        this.delete(key[index]).then(() => undefined);
                                                        return undefined;
                                                }

                                                return (options && options.raw) ? row : row.value;
                                        });
                                }

                                if (typeof data.expires === 'number' && Date.now() > data.expires) {
                                        return this.delete(key).then(() => undefined);
                                }

                                return (options && options.raw) ? data : data.value;
                        });
        }

        set(key, value, ttl) {
                const keyPrefixed = this._getKeyPrefix(key);
                if (typeof ttl === 'undefined') {
                        ttl = this.opts.ttl;
                }

                if (ttl === 0) {
                        ttl = undefined;
                }

                const {store} = this.opts;

                return Promise.resolve()
                        .then(() => {
                                const expires = (typeof ttl === 'number') ? (Date.now() + ttl) : null;
                                if (typeof value === 'symbol') {
                                        this.emit('error', 'symbol cannot be serialized');
                                }

                                value = {value, expires};
                                return this.opts.serialize(value);
                        })
                        .then(value => store.set(keyPrefixed, value, ttl))
                        .then(() => true);
        }

        delete(key) {
                const {store} = this.opts;
                if (Array.isArray(key)) {
                        const keyPrefixed = this._getKeyPrefixArray(key);
                        if (store.deleteMany === undefined) {
                                const promises = [];
                                for (const key of keyPrefixed) {
                                        promises.push(store.delete(key));
                                }

                                return Promise.allSettled(promises)
                                        .then(values => values.every(x => x.value === true));
                        }

                        return Promise.resolve()
                                .then(() => store.deleteMany(keyPrefixed));
                }

                const keyPrefixed = this._getKeyPrefix(key);
                return Promise.resolve()
                        .then(() => store.delete(keyPrefixed));
        }

        clear() {
                const {store} = this.opts;
                return Promise.resolve()
                        .then(() => store.clear());
        }

        has(key) {
                const keyPrefixed = this._getKeyPrefix(key);
                const {store} = this.opts;
                return Promise.resolve()
                        .then(async () => {
                                if (typeof store.has === 'function') {
                                        return store.has(keyPrefixed);
                                }

                                const value = await store.get(keyPrefixed);
                                return value !== undefined;
                        });
        }

        disconnect() {
                const {store} = this.opts;
                if (typeof store.disconnect === 'function') {
                        return store.disconnect();
                }
        }
}

module.exports = Keyv;