1 | 'use strict';
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2 |
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3 | const EventEmitter = require('events');
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4 | const JSONB = require('json-buffer');
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5 |
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6 | const loadStore = options => {
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7 | const adapters = {
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8 | redis: '@keyv/redis',
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9 | mongodb: '@keyv/mongo',
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10 | mongo: '@keyv/mongo',
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11 | sqlite: '@keyv/sqlite',
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12 | postgresql: '@keyv/postgres',
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13 | postgres: '@keyv/postgres',
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14 | mysql: '@keyv/mysql',
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15 | };
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16 | if (options.adapter || options.uri) {
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17 | const adapter = options.adapter || /^[^:]*/.exec(options.uri)[0];
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18 | return new (require(adapters[adapter]))(options);
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19 | }
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20 |
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21 | return new Map();
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22 | };
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23 |
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24 | class Keyv extends EventEmitter {
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25 | constructor(uri, options) {
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26 | super();
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27 | this.opts = Object.assign(
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28 | {
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29 | namespace: 'keyv',
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30 | serialize: JSONB.stringify,
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31 | deserialize: JSONB.parse,
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32 | },
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33 | (typeof uri === 'string') ? { uri } : uri,
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34 | options,
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35 | );
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36 |
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37 | if (!this.opts.store) {
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38 | const adapterOptions = Object.assign({}, this.opts);
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39 | this.opts.store = loadStore(adapterOptions);
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40 | }
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41 |
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42 | if (typeof this.opts.store.on === 'function') {
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43 | this.opts.store.on('error', error => this.emit('error', error));
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44 | }
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45 |
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46 | this.opts.store.namespace = this.opts.namespace;
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47 | }
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48 |
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49 | _getKeyPrefix(key) {
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50 | return `${this.opts.namespace}:${key}`;
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51 | }
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52 |
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53 | get(key, options) {
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54 | const keyPrefixed = this._getKeyPrefix(key);
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55 | const { store } = this.opts;
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56 | return Promise.resolve()
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57 | .then(() => store.get(keyPrefixed))
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58 | .then(data => (typeof data === 'string') ? this.opts.deserialize(data) : data)
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59 | .then(data => {
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60 | if (data === undefined) {
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61 | return undefined;
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62 | }
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63 |
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64 | if (typeof data.expires === 'number' && Date.now() > data.expires) {
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65 | this.delete(key);
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66 | return undefined;
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67 | }
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68 |
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69 | return (options && options.raw) ? data : data.value;
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70 | });
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71 | }
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72 |
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73 | set(key, value, ttl) {
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74 | const keyPrefixed = this._getKeyPrefix(key);
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75 | if (typeof ttl === 'undefined') {
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76 | ttl = this.opts.ttl;
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77 | }
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78 |
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79 | if (ttl === 0) {
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80 | ttl = undefined;
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81 | }
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82 |
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83 | const { store } = this.opts;
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84 |
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85 | return Promise.resolve()
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86 | .then(() => {
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87 | const expires = (typeof ttl === 'number') ? (Date.now() + ttl) : null;
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88 | value = { value, expires };
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89 | return this.opts.serialize(value);
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90 | })
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91 | .then(value => store.set(keyPrefixed, value, ttl))
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92 | .then(() => true);
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93 | }
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94 |
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95 | delete(key) {
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96 | const keyPrefixed = this._getKeyPrefix(key);
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97 | const { store } = this.opts;
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98 | return Promise.resolve()
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99 | .then(() => store.delete(keyPrefixed));
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100 | }
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101 |
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102 | clear() {
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103 | const { store } = this.opts;
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104 | return Promise.resolve()
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105 | .then(() => store.clear());
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106 | }
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107 | }
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108 |
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109 | module.exports = Keyv;
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