How to Implement Targeted WebSocket Messaging in Go with Gorilla?

Targeted WebSocket Messaging in Go with Gorilla

In Go, leveraging websockets to establish real-time communication channels requires understanding how to send messages to specific clients. This article tackles this topic, delving into a scenario where a typeahead feature retrieves search results from a search engine and communicates them via websockets.

Unique Client Identification

To send messages to specific clients, the server must first uniquely identify them. In your case, you plan to add an Id field to the Client struct. This will serve as the unique identifier.

Hub Modifications

Modify the Hub struct in hub.go to handle targeted messaging.

1. Replace connections map[*Client]bool with connections map[idType]*connection, where idType represents the type of your Id field (e.g., int or string).
2. Change broadcast chan []byte to send chan message, where message is a custom type containing the message data and the target client's idType.

Sending Targeted Messages

1. In hub.run(), modify the inner for loop to select based on the message's ID to send it to the specific client.
2. Send messages to clients by creating message objects with the appropriate ID and data.

Client Modifications

Add an ID field to the Client struct in client.go and initialize it using the NewClient function.

Putting it all Together

Now that the Hub and Client types are updated, you can use them to establish socket connections and send messages to specific clients.

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