Cinq stratégies d'optimisation pour résoudre le problème de la vitesse d'accès aux sites Web en langage Go

var cache sync.Map

func getPage(url string) []byte {
    // 先在缓存中查找是否已保存该网页
    value, found := cache.Load(url)
    if found {
        return value.([]byte)
    }

    // 如果缓存中没有，则从后端服务获取
    resp, err := http.Get(url)
    if err != nil {
        log.Println("Error fetching page:", err)
        return nil
    }
    defer resp.Body.Close()

    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        log.Println("Error reading page body:", err)
        return nil
    }

    // 将网页保存到缓存中
    cache.Store(url, body)

    return body
}

func handleRequest(url string, wg *sync.WaitGroup) {
    defer wg.Done()

    response, err := http.Get(url)
    if err != nil {
        log.Println("Error handling request:", err)
        return
    }
    defer response.Body.Close()

    // 处理响应...
}

func main() {
    urls := []string{"http://example.com", "http://example.org", "http://example.net"}

    var wg sync.WaitGroup
    wg.Add(len(urls))

    for _, url := range urls {
        go handleRequest(url, &wg)
    }

    wg.Wait()
}

func handleRequest(conn net.Conn) {
    defer conn.Close()

    reader := bufio.NewReader(conn)
    writer := bufio.NewWriter(conn)

    // 从客户端读取请求...
    request, err := reader.ReadString('
')
    if err != nil {
        log.Println("Error reading request:", err)
        return
    }

    // 处理请求...

    // 向客户端发送响应...
    response := "Hello, World!
"
    _, err = writer.WriteString(response)
    if err != nil {
        log.Println("Error writing response:", err)
        return
    }
    writer.Flush()
}

func main() {
    listener, err := net.Listen("tcp", "localhost:8080")
    if err != nil {
        log.Fatal("Error starting server:", err)
    }
    defer listener.Close()

    for {
        conn, err := listener.Accept()
        if err != nil {
            log.Println("Error accepting connection:", err)
            continue
        }

        go handleRequest(conn)
    }
}

var dbPool *sql.DB

func initDB() {
    var err error
    dbPool, err = sql.Open("mysql", "user:password@tcp(localhost:3306)/database")
    if err != nil {
        log.Fatal("Error opening database connection:", err)
    }

    dbPool.SetMaxOpenConns(10)
    dbPool.SetMaxIdleConns(5)
    dbPool.SetConnMaxLifetime(time.Minute * 5)
}

func handleRequest(w http.ResponseWriter, r *http.Request) {
    // 获取一个数据库连接
    dbConn, err := dbPool.Acquire(r.Context())
    if err != nil {
        http.Error(w, "Error acquiring database connection", http.StatusInternalServerError)
        return
    }
    defer dbConn.Release()

    // 执行数据库操作...
}

func main() {
    initDB()

    http.HandleFunc("/", handleRequest)
    http.ListenAndServe(":8080", nil)
}

func handleRequest(w http.ResponseWriter, r *http.Request) {
    // 处理请求...

    // 创建一个gzip.Writer
    gzipWriter := gzip.NewWriter(w)
    defer gzipWriter.Close()

    // 设置响应头
    w.Header().Set("Content-Encoding", "gzip")

    // 向gzip.Writer写入响应数据
    _, err := gzipWriter.Write(response)
    if err != nil {
        log.Println("Error writing response:", err)
        return
    }

    // 执行gzip.Writer的Flush操作，确保数据被写入http.ResponseWriter
    err = gzipWriter.Flush()
    if err != nil {
        log.Println("Error flushing response:", err)
        return
    }
}

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