build: Allow passing in an existing Redis instance (#30)

packages/keyv-redis/README.md

@@ -36,11 +36,23 @@ const keyv = new Keyv('redis://user:pass@localhost:6379', { disable_resubscribin
 Or you can manually create a storage adapter instance and pass it to Keyv:
 
 ```js
+const KeyvRedis = require('@keyv/redis');
 const Keyv = require('keyv');
+
+const keyvRedis = new KeyvRedis('redis://user:pass@localhost:6379');
+const keyv = new Keyv({ store: keyvRedis });
+```
+
+Or reuse a previous Redis instance:
+
+```js
 const KeyvRedis = require('@keyv/redis');
+const Redis = require('ioredis');
+const Keyv = require('keyv');
 
-const redis = new KeyvRedis('redis://user:pass@localhost:6379');
-const keyv = new Keyv({ store: redis });
+const redis = new Redis('redis://user:pass@localhost:6379');
+const keyvRedis = new KeyvRedis(redis);
+const keyv = new Keyv({ store: keyvRedis });
 ```
 
 ## License

packages/keyv-redis/src/index.js

@@ -6,13 +6,14 @@ const Redis = require('ioredis');
 class KeyvRedis extends EventEmitter {
 	constructor(uri, opts) {
 		super();
-		opts = Object.assign(
-			{},
-			(typeof uri === 'string') ? { uri } : uri,
-			opts
-		);
 
-		this.redis = new Redis(opts.uri, opts);
+		if (uri instanceof Redis) {
+			this.redis = uri;
+		} else {
+			opts = Object.assign({}, typeof uri === 'string' ? { uri } : uri, opts);
+			this.redis = new Redis(opts.uri, opts);
+		}
+
 		this.redis.on('error', err => this.emit('error', err));
 	}
 

packages/keyv-redis/test/test.js

@@ -2,6 +2,7 @@ import test from 'ava';
 import keyvTestSuite, { keyvOfficialTests } from '@keyv/test-suite';
 import Keyv from 'keyv';
 import KeyvRedis from 'this';
+import Redis from 'ioredis';
 
 const { REDIS_HOST = 'localhost' } = process.env;
 const redisURI = `redis://${REDIS_HOST}`;
@@ -10,3 +11,15 @@ keyvOfficialTests(test, Keyv, redisURI, 'redis://foo');
 
 const store = () => new KeyvRedis(redisURI);
 keyvTestSuite(test, Keyv, store);
+
+test('reuse a redis instance', async t => {
+	const redis = new Redis(redisURI);
+	redis.foo = 'bar';
+	const keyv = new KeyvRedis(redis);
+  t.is(keyv.redis.foo, 'bar');
+
+  await keyv.set('foo', 'bar');
+  const value = await redis.get('foo');
+	t.true(value === 'bar');
+	t.true(await keyv.get('foo') === value);
+});