feat: remove direct redis dependency

BREAKING CHANGE: the library will no longer create Redis clients on
behalf of the user.

Before:

```js
io.adapter(redisAdapter({ host: "localhost", port: 6379 }));
```

After:

```js
const pubClient = createClient({ host: "localhost", port: 6379 });
const subClient = pubClient.duplicate();

io.adapter(redisAdapter(pubClient, subClient));
```

Related:

- #314
- #374

Author: darrachequesne

README.md

@@ -30,28 +30,41 @@
 
 ## How to use
 
+Installation:
+
+```
+$ npm install @socket.io/redis-adapter redis
+```
+
 ### CommonJS
 
 ```js
 const io = require('socket.io')(3000);
+const { createClient } = require('redis');
 const redisAdapter = require('@socket.io/redis-adapter');
-io.adapter(redisAdapter({ host: 'localhost', port: 6379 }));
+
+const pubClient = createClient({ host: 'localhost', port: 6379 });
+const subClient = pubClient.duplicate();
+io.adapter(redisAdapter(pubClient, subClient));
 ```
 
 ### ES6 modules
 
 ```js
 import { Server } from 'socket.io';
+import { createClient } from 'redis';
 import redisAdapter from '@socket.io/redis-adapter';
 
 const io = new Server(3000);
-io.adapter(redisAdapter({ host: 'localhost', port: 6379 }));
+const pubClient = createClient({ host: 'localhost', port: 6379 });
+const subClient = pubClient.duplicate();
+io.adapter(redisAdapter(pubClient, subClient));
 ```
 
 ### TypeScript
 
 ```ts
-// npm i -D @types/redis
+// npm i -D redis @types/redis
 import { Server } from 'socket.io';
 import { createAdapter } from '@socket.io/redis-adapter';
 import { RedisClient } from 'redis';
@@ -60,7 +73,7 @@ const io = new Server(8080);
 const pubClient = new RedisClient({ host: 'localhost', port: 6379 });
 const subClient = pubClient.duplicate();
 
-io.adapter(createAdapter({ pubClient, subClient }));
+io.adapter(createAdapter(pubClient, subClient));
 ```
 
 By running Socket.IO with the `@socket.io/redis-adapter` adapter you can run
@@ -150,26 +163,13 @@ The request and response channels are used in the additional methods exposed by
 
 ## API
 
-### adapter(uri[, opts])
-
-`uri` is a string like `localhost:6379` where your redis server
-is located. For a list of options see below.
-
-### adapter(opts)
+### adapter(pubClient, subClient[, opts])
 
 The following options are allowed:
 
 - `key`: the name of the key to pub/sub events on as prefix (`socket.io`)
-- `host`: host to connect to redis on (`localhost`)
-- `port`: port to connect to redis on (`6379`)
-- `pubClient`: optional, the redis client to publish events on
-- `subClient`: optional, the redis client to subscribe to events on
 - `requestsTimeout`: optional, after this timeout the adapter will stop waiting from responses to request (`5000ms`)
 
-If you decide to supply `pubClient` and `subClient`, make sure you use
-[node_redis](https://github.com/mranney/node_redis) as a client or one
-with an equivalent API.
-
 ### RedisAdapter
 
 The redis adapter instances expose the following properties
@@ -242,41 +242,6 @@ try {
 }
 ```
 
-## Client error handling
-
-Access the `pubClient` and `subClient` properties of the
-Redis Adapter instance to subscribe to its `error` event:
-
-```js
-const adapter = require('@socket.io/redis-adapter')('localhost:6379');
-adapter.pubClient.on('error', function(){});
-adapter.subClient.on('error', function(){});
-```
-
-The errors emitted from `pubClient` and `subClient` will
-also be forwarded to the adapter instance:
-
-```js
-const io = require('socket.io')(3000);
-const redisAdapter = require('@socket.io/redis-adapter');
-io.adapter(redisAdapter({ host: 'localhost', port: 6379 }));
-io.of('/').adapter.on('error', function(){});
-```
-
-## Custom client (eg: with authentication)
-
-If you need to create a redisAdapter to a redis instance
-that has a password, use pub/sub options instead of passing
-a connection string.
-
-```js
-const redis = require('redis');
-const redisAdapter = require('@socket.io/redis-adapter');
-const pubClient = redis.createClient(port, host, { auth_pass: "pwd" });
-const subClient = pubClient.duplicate();
-io.adapter(redisAdapter({ pubClient, subClient }));
-```
-
 ## With ioredis client
 
 ### Cluster example
@@ -297,10 +262,10 @@ const startupNodes = [
   }
 ];
 
-io.adapter(redisAdapter({
-  pubClient: new Redis.Cluster(startupNodes),
-  subClient: new Redis.Cluster(startupNodes)
-}));
+const pubClient = new Redis.Cluster(startupNodes);
+const subClient = pubClient.duplicate();
+
+io.adapter(redisAdapter(pubClient, subClient));
 ```
 
 ### Sentinel Example
@@ -318,10 +283,10 @@ const options = {
   name: 'master01'
 };
 
-io.adapter(redisAdapter({
-  pubClient: new Redis(options),
-  subClient: new Redis(options)
-}));
+const pubClient = new Redis(options);
+const subClient = pubClient.duplicate();
+
+io.adapter(redisAdapter(pubClient, subClient));
 ```
 
 ## Protocol

lib/index.ts

@@ -1,5 +1,4 @@
 import uid2 = require("uid2");
-import { createClient } from "redis";
 import msgpack = require("notepack.io");
 import { Adapter, BroadcastOptions, Room, SocketId } from "socket.io-adapter";
 
@@ -35,60 +34,34 @@ export interface RedisAdapterOptions {
    * @default socket.io
    */
   key: string;
-  /**
-   * the redis client to publish events on
-   */
-  pubClient: any;
-  /**
-   * the redis client to subscribe to events on
-   */
-  subClient: any;
   /**
    * after this timeout the adapter will stop waiting from responses to request
    * @default 5000
    */
   requestsTimeout: number;
 }
 
-function createRedisClient(uri, opts) {
-  if (uri) {
-    // handle uri string
-    return createClient(uri, opts);
-  } else {
-    return createClient(opts);
-  }
-}
-
 /**
- * Returns a redis Adapter class.
+ * Returns a function that will create a RedisAdapter instance.
  *
- * @param {String} uri - optional, redis uri
- * @param {String} opts - redis connection options
- * @return {RedisAdapter} adapter
+ * @param pubClient - a Redis client that will be used to publish messages
+ * @param subClient - a Redis client that will be used to receive messages (put in subscribed state)
+ * @param opts - additional options
  *
  * @public
  */
-export function createAdapter(uri: string, opts?: Partial<RedisAdapterOptions>);
-export function createAdapter(opts: Partial<RedisAdapterOptions>);
 export function createAdapter(
-  uri?: any,
-  opts: Partial<RedisAdapterOptions> = {}
+  pubClient: any,
+  subClient: any,
+  opts?: Partial<RedisAdapterOptions>
 ) {
-  // handle options only
-  if (typeof uri === "object") {
-    opts = uri;
-    uri = null;
-  }
-
   return function (nsp) {
-    return new RedisAdapter(nsp, uri, opts);
+    return new RedisAdapter(nsp, pubClient, subClient, opts);
   };
 }
 
 export class RedisAdapter extends Adapter {
   public readonly uid;
-  public readonly pubClient: any;
-  public readonly subClient: any;
   public readonly requestsTimeout: number;
 
   private readonly channel: string;
@@ -100,17 +73,21 @@ export class RedisAdapter extends Adapter {
    * Adapter constructor.
    *
    * @param nsp - the namespace
-   * @param uri - the url of the Redis server
-   * @param opts - the options for both the Redis adapter and the Redis client
+   * @param pubClient - a Redis client that will be used to publish messages
+   * @param subClient - a Redis client that will be used to receive messages (put in subscribed state)
+   * @param opts - additional options
    *
    * @public
    */
-  constructor(nsp, uri: string, opts: Partial<RedisAdapterOptions> = {}) {
+  constructor(
+    nsp: any,
+    readonly pubClient: any,
+    readonly subClient: any,
+    opts: Partial<RedisAdapterOptions> = {}
+  ) {
     super(nsp);
 
     this.uid = uid2(6);
-    this.pubClient = opts.pubClient || createRedisClient(uri, opts);
-    this.subClient = opts.subClient || createRedisClient(uri, opts);
     this.requestsTimeout = opts.requestsTimeout || 5000;
 
     const prefix = opts.key || "socket.io";

package-lock.json

@@ -21,19 +21,20 @@
   "dependencies": {
     "debug": "~4.3.1",
     "notepack.io": "~2.2.0",
-    "redis": "^3.0.0",
     "socket.io-adapter": "^2.2.0",
     "uid2": "0.0.3"
   },
   "devDependencies": {
     "@types/expect.js": "^0.3.29",
     "@types/mocha": "^8.2.1",
     "@types/node": "^14.14.7",
+    "@types/redis": "^2.8.28",
     "expect.js": "0.3.1",
     "ioredis": "^4.0.0",
     "mocha": "^3.4.2",
     "nyc": "^15.1.0",
     "prettier": "^2.1.2",
+    "redis": "^3.1.2",
     "socket.io": "^4.0.0",
     "socket.io-client": "^4.0.0",
     "ts-node": "^9.1.1",