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|
'use strict';
const EventEmitter = require('events');
const JSONB = require('json-buffer');
const loadStore = opts => {
const adapters = {
redis: '@keyv/redis',
mongodb: '@keyv/mongo',
mongo: '@keyv/mongo',
sqlite: '@keyv/sqlite',
postgresql: '@keyv/postgres',
postgres: '@keyv/postgres',
mysql: '@keyv/mysql'
};
if (opts.adapter || opts.uri) {
const adapter = opts.adapter || /^[^:]*/.exec(opts.uri)[0];
return new (require(adapters[adapter]))(opts);
}
return new Map();
};
class Keyv extends EventEmitter {
constructor(uri, opts) {
super();
this.opts = Object.assign(
{
namespace: 'keyv',
serialize: JSONB.stringify,
deserialize: JSONB.parse
},
(typeof uri === 'string') ? { uri } : uri,
opts
);
if (!this.opts.store) {
const adapterOpts = Object.assign({}, this.opts);
this.opts.store = loadStore(adapterOpts);
}
if (typeof this.opts.store.on === 'function') {
this.opts.store.on('error', err => this.emit('error', err));
}
this.opts.store.namespace = this.opts.namespace;
}
_getKeyPrefix(key) {
return `${this.opts.namespace}:${key}`;
}
get(key) {
key = this._getKeyPrefix(key);
const store = this.opts.store;
return Promise.resolve()
.then(() => store.get(key))
.then(data => {
data = (typeof data === 'string') ? this.opts.deserialize(data) : data;
if (data === undefined) {
return undefined;
}
if (typeof data.expires === 'number' && Date.now() > data.expires) {
this.delete(key);
return undefined;
}
return data.value;
});
}
set(key, value, ttl) {
key = this._getKeyPrefix(key);
if (typeof ttl === 'undefined') {
ttl = this.opts.ttl;
}
if (ttl === 0) {
ttl = undefined;
}
const store = this.opts.store;
return Promise.resolve()
.then(() => {
const expires = (typeof ttl === 'number') ? (Date.now() + ttl) : null;
value = { value, expires };
return store.set(key, this.opts.serialize(value), ttl);
})
.then(() => true);
}
delete(key) {
key = this._getKeyPrefix(key);
const store = this.opts.store;
return Promise.resolve()
.then(() => store.delete(key));
}
clear() {
const store = this.opts.store;
return Promise.resolve()
.then(() => store.clear());
}
}
module.exports = Keyv;
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