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Update pub-sub.md

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Leibale Eidelman
2024-02-19 13:18:40 -08:00
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@@ -4,7 +4,9 @@ The Pub/Sub API is implemented by `RedisClient`, `RedisCluster`, and `RedisSenti
## Pub/Sub with `RedisClient` ## Pub/Sub with `RedisClient`
Pub/Sub requires a dedicated stand-alone client. You can easily get one by `.duplicate()`ing an existing `RedisClient`: ### RESP2
Using RESP2, Pub/Sub "takes over" the connection (a client with subscriptions will not execute commands), therefore it requires a dedicated connection. You can easily get one by `.duplicate()`ing an existing `RedisClient`:
```javascript ```javascript
const subscriber = client.duplicate(); const subscriber = client.duplicate();
@@ -12,7 +14,7 @@ subscriber.on('error', err => console.error(err));
await subscriber.connect(); await subscriber.connect();
``` ```
When working with a `RedisCluster`, this is handled automatically for you. > When working with either `RedisCluster` or `RedisSentinel`, this is handled automatically for you.
### `sharded-channel-moved` event ### `sharded-channel-moved` event
@@ -29,6 +31,8 @@ The event listener signature is as follows:
) )
``` ```
> When working with `RedisCluster`, this is handled automatically for you.
## Subscribing ## Subscribing
```javascript ```javascript
@@ -39,7 +43,7 @@ await client.pSubscribe('channe*', listener);
await client.sSubscribe('channel', listener); await client.sSubscribe('channel', listener);
``` ```
> ⚠️ Subscribing to the same channel more than once will create multiple listeners which will each be called when a message is recieved. > ⚠️ Subscribing to the same channel more than once will create multiple listeners, each of which will be called when a message is received.
## Publishing ## Publishing