How to Send Websocket Messages to Specific Clients in Go Using Gorilla Websocket?

Broadcasting Websocket Messages in Go Using Gorilla Websocket for Specific Clients

In the realm of websocket development with Go and Gorilla Websocket, handling real-world applications often necessitates the selective distribution of messages to specific clients rather than broadcasting to everyone. This article explores how this can be achieved.

Identifying Unique Clients

To enable targeted message delivery, a key step is to uniquely identify clients. The proposed solution involves generating a unique ID for each client upon registration, which is then stored in a property of the connection structure.

Managing Client Connections

Gorilla Websocket's hub structure serves as a central repository for managing client connections. It contains a connections pool that facilitates broadcasting messages to all connected clients.

Broadcast vs. Private Messages

To handle private messages, an additional method should be implemented within the hub. This method takes a user ID and a message, then iterates over the connections pool, checking if a client's user ID matches the given user ID. For matching clients, it sends the message directly.

Example Code

The following pseudocode illustrates the process of sending a private message:

<code class="go">func SendPrivateMessage(userId, message string) {
    for c := range hub.connections {
        if c.userId == userId {
            select {
            case c.send <p>By utilizing this approach, developers can establish selective message distribution in their websocket applications, enabling targeted communication tailored to specific users.</p></code>

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