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Mini Shell
Mini Shell
'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;
Zerion Mini Shell 1.0