Go 언어를 사용하여 주문 시스템의 테이크아웃 배송 추적 기능을 개발하는 방법

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
}

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
}

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)
}