golang Websocket Development Guide: Implementing multi-person online schedule management function-Golang-php.cn

golang Websocket Development Guide: Implementing multi-person online schedule management function

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Release： 2023-12-02 09:09:26

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golang Websocket开发指南：实现多人在线日程管理功能

Golang Websocket Development Guide: Implementing Multi-person Online Schedule Management Function

Introduction:
With the fast pace and multi-tasking requirements of modern life, we often need to Make adjustments and coordination in schedule. The multi-person online schedule management function can help multiple people collaborate and share schedules in real time, improving work efficiency. This article will introduce how to use Golang and Websocket technology to implement multi-person online schedule management functions, and attach specific code examples.

Environment and dependencies:
Golang 1.13 or higher
Gin Web Framework
Gorilla Websocket Library
Create project and initialize:
First, we need to create an empty Golang project and initialize a new Go module using the following command in the project root directory:
```
go mod init schedule
```
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Then, we need to introduce the required dependencies into the project:

go get -u github.com/gin-gonic/gin
go get -u github.com/gorilla/websocket

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Create a Websocket server:
Next, we will create a Websocket server for the implementation of multi-person online schedule management functions . In the root directory of the project, create a file named main.go and add the following code in the file:

package main

import (
    "log"
    "net/http"

    "github.com/gin-gonic/gin"
    "github.com/gorilla/websocket"
)

func main() {
    router := gin.Default()

    upgrader := websocket.Upgrader{
        CheckOrigin: func(r *http.Request) bool {
            return true
        },
    }

    router.GET("/ws", func(c *gin.Context) {
        conn, err := upgrader.Upgrade(c.Writer, c.Request, nil)
        if err != nil {
            log.Println("Failed to upgrade connection:", err)
            return
        }

        // TODO: 处理连接和消息
    })

    router.Run(":8000")
}

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In the above code, we use the Gin framework Created a simple HTTP server and registered a Websocket route on the /ws path. In the routing processing function, we upgrade the Upgrade HTTP connection to a Websocket connection and obtain the connection established with the client.

Processing connections and messages:
In our Websocket server, we need to implement connection processing and message broadcast functions. Add the following code in the routing processing function:

connections := make(map[*websocket.Conn]bool) // 存储所有连接的映射表

router.GET("/ws", func(c *gin.Context) {
    conn, err := upgrader.Upgrade(c.Writer, c.Request, nil)
    if err != nil {
        log.Println("Failed to upgrade connection:", err)
        return
    }

    connections[conn] = true

    for {
        _, msg, err := conn.ReadMessage()
        if err != nil {
            log.Println("Error reading message:", err)
            delete(connections, conn)
            conn.Close()
            break
        }

        // 广播消息给所有连接
        for conn := range connections {
            err := conn.WriteMessage(websocket.TextMessage, msg)
            if err != nil {
                log.Println("Error broadcasting message:", err)
                delete(connections, conn)
                conn.Close()
            }
        }
    }
})

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In the above code, we use a mapping table connections to store all connections. When a new connection is established, we add the connection to the mapping table. At the same time, we read the message from the client through an infinite loop and broadcast the message to all connections.

Front-end implementation:
Finally, we need to implement a simple interface on the front-end to test our multi-person online schedule management function. In the root directory of the project, create a file named index.html and add the following code in the file:

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Schedule</title>
</head>

<body>
    <h1>Schedule</h1>

    <input type="text" id="message" placeholder="Enter your message">
    <button id="send">Send</button>

    <ul id="messages"></ul>

    <script>
        const socket = new WebSocket("ws://localhost:8000/ws");

        const messageInput = document.getElementById("message");
        const sendButton = document.getElementById("send");
        const messagesList = document.getElementById("messages");

        sendButton.addEventListener("click", () => {
            const message = messageInput.value;
            socket.send(message);
            messageInput.value = "";
        });

        socket.addEventListener("message", (event) => {
            const message = document.createElement("li");
            message.innerHTML = event.data;
            messagesList.appendChild(message);
        });
    </script>
</body>

</html>

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In the above code, we used JavaScript WebSocket object to establish a connection with the server and listen for user input and server messages. When the user clicks the Send button, we send the entered message to the server. At the same time, when a message is received from the server, we add the message to the message list on the interface.

Summary:
This article introduces how to use Golang and Websocket technology to implement multi-person online schedule management functions. We first created a Websocket server and implemented the connection processing and message broadcast functions. Then, we implemented a simple interface on the front end to test our functionality. Through this article, I hope readers can understand and master the methods and techniques of using Golang and Websocket to achieve similar functions.

Reference link:

Gin framework: https://github.com/gin-gonic/gin
Gorilla Websocket library: https://github. com/gorilla/websocket

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