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| 1 | +Redis store for node cache manager |
| 2 | +================================== |
| 3 | + |
| 4 | +Redis cache store for [node-cache-manager](https://github.com/BryanDonovan/node-cache-manager). |
| 5 | + |
| 6 | +How is this package different from `node-cache-manager-redis`? |
| 7 | +---------------------------------------------------------------------------------- |
| 8 | +This is a **completely different version** than the earlier [node-cache-manager-redis](https://github.com/dial-once/node-cache-manager-redis). This package does not use `redis-pool` which is unnecessary and not actively maintained. |
| 9 | + |
| 10 | +This package aims to provide **the most simple wrapper possible** by just passing the configuration to the underlying `node_redis` package. |
| 11 | + |
| 12 | +Installation |
| 13 | +------------ |
| 14 | + |
| 15 | +```sh |
| 16 | +npm install cache-manager-redis-store --save |
| 17 | +``` |
| 18 | +or |
| 19 | +```sh |
| 20 | +yarn add cache-manager-redis-store |
| 21 | +``` |
| 22 | + |
| 23 | +Usage Examples |
| 24 | +-------------- |
| 25 | + |
| 26 | +See examples below on how to implement the Redis cache store. |
| 27 | + |
| 28 | +### Single store |
| 29 | + |
| 30 | +```js |
| 31 | +var cacheManager = require('cache-manager'); |
| 32 | +var redisStore = require('cache-manager-redis-store'); |
| 33 | + |
| 34 | +var redisCache = cacheManager.caching({ |
| 35 | + store: redisStore, |
| 36 | + host: 'localhost', // default value |
| 37 | + port: 6379, // default value |
| 38 | + auth_pass: 'XXXXX', |
| 39 | + db: 0, |
| 40 | + ttl: 600 |
| 41 | +}); |
| 42 | + |
| 43 | +// listen for redis connection error event |
| 44 | +var redisClient = redisCache.getClient(); |
| 45 | + |
| 46 | +redisClient.on('error', (error) => { |
| 47 | + // handle error here |
| 48 | + console.log(error); |
| 49 | +}); |
| 50 | + |
| 51 | +var ttl = 5; |
| 52 | + |
| 53 | +redisCache.set('foo', 'bar', { ttl: ttl }, (err) => { |
| 54 | + if (err) { |
| 55 | + throw err; |
| 56 | + } |
| 57 | + |
| 58 | + redisCache.get('foo', (err, result) => { |
| 59 | + console.log(result); |
| 60 | + // >> 'bar' |
| 61 | + redisCache.del('foo', (err) => { |
| 62 | + }); |
| 63 | + }); |
| 64 | +}); |
| 65 | + |
| 66 | +function getUser(id, cb) { |
| 67 | + setTimeout(() => { |
| 68 | + console.log("Returning user from slow database."); |
| 69 | + cb(null, { id: id, name: 'Bob' }); |
| 70 | + }, 100); |
| 71 | +} |
| 72 | + |
| 73 | +var userId = 123; |
| 74 | +var key = `user_${userId}`; |
| 75 | + |
| 76 | +// Note: ttl is optional in wrap() |
| 77 | +redisCache.wrap(key, (cb) => { |
| 78 | + getUser(userId, cb); |
| 79 | +}, { ttl: ttl }, (err, user) => { |
| 80 | + console.log(user); |
| 81 | + |
| 82 | + // Second time fetches user from redisCache |
| 83 | + redisCache |
| 84 | + .wrap(key, () => getUser(userId)) |
| 85 | + .then(console.log) |
| 86 | + .catch(err => { |
| 87 | + // handle error |
| 88 | + }); |
| 89 | +}); |
| 90 | +``` |
| 91 | + |
| 92 | +### Multi-store |
| 93 | + |
| 94 | +```js |
| 95 | +var cacheManager = require('cache-manager'); |
| 96 | +var redisStore = require('cache-manager-redis-store'); |
| 97 | + |
| 98 | +var redisCache = cacheManager.caching({ store: redisStore, db: 0, ttl: 600 }); |
| 99 | +var memoryCache = cacheManager.caching({ store: 'memory', max: 100, ttl: 60 }); |
| 100 | + |
| 101 | +var multiCache = cacheManager.multiCaching([memoryCache, redisCache]); |
| 102 | + |
| 103 | +var userId2 = 456; |
| 104 | +var key2 = `user_${userId2}`; |
| 105 | + |
| 106 | +// Set value in all caches |
| 107 | +multiCache.set('foo2', 'bar2', { ttl: ttl }, (err) => { |
| 108 | + if (err) { |
| 109 | + throw err; |
| 110 | + } |
| 111 | + |
| 112 | + // Fetches from highest priority cache that has the key |
| 113 | + multiCache.get('foo2', (err, result) => { |
| 114 | + console.log(result); |
| 115 | + |
| 116 | + // Delete from all caches |
| 117 | + multiCache.del('foo2'); |
| 118 | + }); |
| 119 | +}); |
| 120 | + |
| 121 | +// Note: ttl is optional in wrap |
| 122 | +multiCache.wrap(key2, (cb) => { |
| 123 | + getUser(userId2, cb); |
| 124 | +}, (err, user) => { |
| 125 | + console.log(user); |
| 126 | + |
| 127 | + // Second time fetches user from memoryCache, since it's highest priority. |
| 128 | + // If the data expires in the memory cache, the next fetch would pull it from |
| 129 | + // the 'someOtherCache', and set the data in memory again. |
| 130 | + multiCache.wrap(key2, (cb) => { |
| 131 | + getUser(userId2, cb); |
| 132 | + }, (err, user) => { |
| 133 | + console.log(user); |
| 134 | + }); |
| 135 | +}); |
| 136 | +``` |
| 137 | + |
| 138 | +Contribution |
| 139 | +------------ |
| 140 | + |
| 141 | +Want to help improve this package? We take [pull requests](https://github.com/dabroek/node-cache-manager-redis-store/pulls). |
| 142 | + |
| 143 | + |
| 144 | +License |
| 145 | +------- |
| 146 | + |
| 147 | +The `node-cache-manager-redis-store` is licensed under the MIT license. |
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