How to Send Targeted Websocket Updates to Specific Clients in Go (Gorilla)?

Sending Websocket Updates to Specific Clients in Go (Gorilla)

Despite being a novice in Go, you seek guidance on implementing websocket communication for your typeahead project. You have tried leveraging examples from Gorilla's GitHub repository but encounter challenges in understanding how specific clients can be identified and targeted for websocket updates.

To uniquely identify clients, you need to modify the Gorilla hub and client structs to include an ID field. This field can be of a type such as int or string.

Within the Hub struct, replace the connections map with a map that uses this ID type as the key and connection object as the value:

<code class="go">connections map[idType]*connection</code>

Additionally, change the broadcast field in the Hub struct to use a custom message type containing both the message data and the target client ID:

<code class="go">send chan message</code>

Replace the for loop responsible for sending broadcast messages with the following code to send messages to specific clients:

<code class="go">for {
    select {
    case client := <-h.register:
        h.clients[client.ID] = client
    case client := <-h.unregister:
        if _, ok := h.clients[client.ID]; ok {
            delete(h.clients, client.ID)
            close(client.send)
        }
    case message := <-h.send:
        if client, ok := h.clients[message.ID]; ok {
            select {
            case client.send <- message.data:
            default:
                close(client.send)
                delete(h.connections, client)
            }
        }
    }
}</code>

To send messages to specific clients, create a message specifying the target client's ID:

<code class="go">hub.send <- message{ID: targetID, data: msg}</code>

By implementing these modifications, you can now send targeted websocket updates to specific clients in your Go application.

The above is the detailed content of How to Send Targeted Websocket Updates to Specific Clients in Go (Gorilla)?. For more information, please follow other related articles on the PHP Chinese website!