Golang implements barrage

Barrage is a very popular live broadcast interaction method today. On the live broadcast platform, the audience can interact through barrage, allowing the barrage to fly across the screen, making the live broadcast more interesting. How to implement barrage function in golang? Let’s discuss it together.

Before implementing the barrage function, you first need to understand the basic principles of barrage. Barrage is a real-time communication method based on network communication. In live broadcast scenarios, barrage is usually transmitted through the WebSocket protocol. After the server receives the barrage text, it processes and distributes it. Therefore, we need to use golang's websocket library to implement the barrage function.

1. Install websocket library

In golang, we can use websocket in the standard library to implement websocket communication. We need to install the websocket library. You can use the following command to install it:

go get -u github.com/gorilla/websocket

2. Create WebSocket server

Next, we need to create a WebSocket server, the code is as follows:

package main

import (
    "log"
    "net/http"

    "github.com/gorilla/websocket"
)

var upgrader = websocket.Upgrader{
    ReadBufferSize:  1024,
    WriteBufferSize: 1024,
}

func main() {
    http.HandleFunc("/ws", handleWebSocket)
    log.Println("WebSocket server listen at: 8080")
    err := http.ListenAndServe(":8080", nil)
    if err != nil {
        log.Fatal("ListenAndServe: ", err)
    }
}

func handleWebSocket(w http.ResponseWriter, r *http.Request) {
    conn, err := upgrader.Upgrade(w, r, nil)
    if err != nil {
        log.Println("Upgrade:", err)
        return
    }
    defer conn.Close()

    for {
        messageType, message, err := conn.ReadMessage()
        if err != nil {
            log.Println("ReadMessage:", err)
            break
        }
        log.Printf("Received message: %s", message)

        err = conn.WriteMessage(messageType, message)
        if err != nil {
            log.Println("WriteMessage:", err)
            break
        }
    }
}

In the code, we first create a WebSocket The server then defines an Upgrader variable, which is used to upgrade the HTTP connection to a WebSocket connection. We use the http.HandleFunc() function to handle WebSocket requests and define a handleWebSocket() function to receive and process WebSocket messages.

When the browser sends a WebSocket request to the server, the server will upgrade the HTTP connection to a WebSocket connection and call the handleWebSocket() function. In the loop, we receive the message sent by the client using the conn.ReadMessage() function, then print it out and return the message to the client again using the conn.WriteMessage() function.

3. Using barrages on the client

Now that we have successfully created the WebSocket server, we need to use it on the client to send and receive barrages .

On the client side, you can use JavaScript and WebSocket API to establish a WebSocket connection and send barrages. The following is a sample code:

<script>
    var socket = new WebSocket("ws://localhost:8080/ws");

    socket.onopen = function() {
        console.log("WebSocket connection established.");
    };

    socket.onmessage = function(event) {
        // 收到服务端返回的消息
        console.log("Received message: " + event.data);
    };

    function send() {
        // 发送弹幕消息
        var message = document.getElementById("input").value;
        socket.send(message);
        console.log("Sent message: " + message);
    }
</script>

<input type="text" id="input" />
<button onclick="send()">Send</button>

The client code is very simple. We first create a WebSocket object, and specify the URL address of the server, and then set the onopen and onmessage event listeners, which are used to handle the establishment of the WebSocket connection and receive the messages returned by the server respectively.

Add an input box and send button to the page. Users can enter barrage messages in the input box and send barrage messages to the server through the socket.send() function. Service The message will be returned to the client again.

So far, we have successfully implemented the barrage function. Of course, this is just a simple implementation. In practice, more functions need to be added, such as verification and identification, message processing and distribution, etc.

Summary

In this article, we mainly introduce how to use the websocket library to implement the barrage function in golang. By studying this article, you can understand the basic principles and usage of WebSocket, and you can also implement the barrage function through code. I hope this article can inspire you to better understand and use WebSocket technology.

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