中间件是一种计算机软件，可为操作系统提供的软件应用程序提供服务，以便于各个软件之间的沟通，特别是系统软件和应用软件。广泛用于web应用和面向服务的体系结构等。纵观GO语言，中间件应用比较普遍，主要应用：记录对服务器发送的请求（request）处理服务器响应（response ）请求和处理之间做一个权限认证工作远程调用安全等等中间件处理程序是简单的http.Handler，它包装另一个http.Handler做请求的一些预处理和/或后处理。它被称为“中间件”，因为它位于Go Web服务器和实际处理程序之间的中间位置。下面是一些中间件例子记录日志中间件package main import ( "fmt" "log" "net/http" ) func logging(f http.HandlerFunc) http.HandlerFunc { return func(w http.ResponseWriter, r *http.Request) { log.Println(r.URL.Path) f(w, r) } } func foo(w http.ResponseWriter, r

Anonymous function: As the name implies, it is a function without a name. There are many languages ​​such as: java, js, php, etc., among which js is the most favorite. The biggest use of anonymous functions is to simulate block-level scope and avoid data pollution.Today I will mainly talk about anonymous functions and closures in the Golang language.Anonymous functionExample:1,package main import ( "fmt" ) func main() { f:=func(){ fmt.Println("hello world") } f()//hello world fmt.Printf("%T\n",

单例模式是常用的模式之一，一般介绍的单例模式有 饿汉式 和 懒汉式 等，不管那种模式最终目的只有一个，就是只实例化一次，仅允许一个实例存在。GO语言实现单例模式相对简单，这里考虑到并发，用到了sync.Mutex 和结构体sync.Once。示例：package main import ( "fmt" "sync" ) var ( lock *sync.Mutex = &sync.Mutex{} instance *Singleton ) type Singleton struct { } func GetInstance() *Singleton { if instance == nil { lock.Lock() defer lock.Unlock() if instance == nil { instance = &Singleton{} fmt.Println("instance...") } } return instance } func main() { var s *Singleton s = GetInstance() s = GetInstance(

Testing is very important to the development of Internet application software. It is of great significance to software reliability assurance. Through testing, it is possible to find and correct errors in the software as much as possible to improve software quality.Here we mainly explain how the Go language implements unit testing and performance testing.Go language comes with a lightweight testing framework testing and comes with the go test command to implement unit testing and performance test