How to Target WebSocket Updates to a Specific Client in Go Using Gorilla?

Sending WebSocket Updates to a Unique Client in Go Using Gorilla

Many applications need the ability to send WebSocket messages to specific clients. While the Gorilla chat example demonstrates broadcasting, it does not provide a starting point for applications that require targeted messaging. This article delves into how to achieve client-specific messaging effectively.

Messaging to a specific client requires writing directly to their connection using NextWriter or WriteMessage. To identify a specific connection, consider passing a pointer to a custom type that contains additional state associated with the connection.

Alternatively, you can modify the Gorilla hub to support targeted messaging by implementing the following steps:

1. Add an ID field to the Client struct to uniquely identify each client.
2. Change the connections field in the hub to map from idType to connection.
3. Define a new message type that contains both the message data and the target client ID.
4. Replace the hub's broadcast field with a send channel of type message.
5. Update the hub's loop to check for messages with specific client IDs and send them accordingly.

By sending messages as message objects that include the target client ID, the hub can selectively route updates to specific clients, enabling fine-grained WebSocket communication in your Go applications.

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