How to use Go language to develop the takeout delivery tracking function of the ordering system

Now, the food delivery industry is booming and people’s living standards have improved. More and more people choose and like to use food delivery services. However, the efficiency and speed of takeout delivery have also become one of the issues that people are most concerned about. The ordering system developed using Go language can effectively provide delivery personnel with real-time route information and tracking details, making the entire delivery process more efficient and smoother. This article will show you how to use the Go language to develop the takeout delivery tracking function of the ordering system, with specific code examples.

1. Determine goals and design routes

Before you start using Go language to develop the takeout delivery tracking function of the ordering system, you need to determine your goals first. What features do you want to achieve? You need to design a course based on these goals. Common delivery tracking functions include: viewing the real-time location and traffic conditions of delivery personnel, tracking parcels and delivery status, etc.

2. Use a third-party API to obtain geographic location data

In order for the delivery person's location to be accurately tracked by the system, you need to use a third-party API to obtain geographic location data. It is very simple to use Baidu Map API to obtain geographical location data in Go language. In the code below, we use the http package and ioutil package to obtain the API response data.

func getLocation(address string) (float64, float64, error) {
    apiUrl := fmt.Sprintf("http://api.map.baidu.com/geocoding/v3/?address=%s&output=json&ak=%s", address, BaiduAk)

    resp, err := http.Get(apiUrl)
    if err != nil {
        return 0, 0, err
    }

    defer resp.Body.Close()
    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        return 0, 0, err
    }

    type location struct {
        Lon float64 `json:"lng"`
        Lat float64 `json:"lat"`
    }
    type result struct {
        Location location `json:"location"`
    }
    type apiResult struct {
        Result result `json:"result"`
    }

    var resultData apiResult
    err = json.Unmarshal(body, &resultData)
    if err != nil {
        return 0, 0, err
    }

    return resultData.Result.Location.Lon, resultData.Result.Location.Lat, nil
}

3. Compare the delivery person’s location information with the route information

Once you have obtained the delivery person’s location information and route information, you need to compare them Yes, to determine whether the delivery driver's current location is on the correct route. This process requires the use of algorithms and data structures, such as line segment intersection determination algorithms and distance calculation formulas. In the code below, we use the go-geo component and the balltree algorithm to implement it.

func getClosestPointOnLineString(lineString geom.LineString, point geom.Point) geom.Point {
    tree := geo.NewTree(2)
    for _, p := range lineString {
        tree.Insert(geo.NewItem(p.XY(), nil))
    }
    nearest := tree.NearestNeighbors(geo.NewItem(point.XY(), nil), 1, -1)
    result := nearest[0].Object().(geo.Pointer).Point()
    return result
}

func getDistance(point1, point2 geom.Point) float64 {
    x := point1.X() - point2.X()
    y := point1.Y() - point2.Y()
    return math.Sqrt(x*x + y*y)
}

func isPointOnLineString(lineString geom.LineString, point geom.Point, threshold float64) bool {
    closestPoint := getClosestPointOnLineString(lineString, point)
    distance := getDistance(closestPoint, point)
    return distance <= threshold
}

4. Transmit real-time information about delivery personnel and packages to the front-end graphical interface

When using the Go language to develop the takeout delivery tracking function of the ordering system, you need to include the delivery Real-time information about passengers and packages is transmitted to the front-end graphical interface. This process requires the use of the WebSocket protocol to make the interaction between the system and the browser more real-time and smoother. For example, in the code below, we have used the Gorilla WebSocket library to implement:

var upgrader = websocket.Upgrader{
    ReadBufferSize:    1024,
    WriteBufferSize:   1024,
    CheckOrigin: func(r *http.Request) bool {
        return true
    },
}

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

    for {
        message := []byte("Hello, world!")
        err = conn.WriteMessage(websocket.TextMessage, message)
        if err != nil {
            log.Println(err)
            break
        }
    }
}

func main() {
    http.HandleFunc("/socket", handleSocket)
    http.ListenAndServe(":8080", nil)
}

In the complete code example, these steps are combined and nested in some loops and conditional statements to implement a complete The takeout delivery tracking function of the ordering system can automatically track the location of the delivery person and the status of the package, and transmit this information to the front-end graphical interface in real time to improve delivery efficiency and user satisfaction.

In short, the Go language is a very powerful and efficient programming language, which can help you quickly develop a highly scalable and high-performance ordering system with takeout delivery tracking functions. By using third-party APIs to obtain geographic location data, using algorithms and data structures to compare the delivery driver's location and route information, and using the WebSocket protocol to transmit information in real time, you can easily build a complete takeout delivery tracking system.

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