如何在golang中获取http请求的初始时间戳？

我正在使用revel框架编写一个golang程序，其中需要检查http请求的初始时间戳

我知道如何用C#做：

---

在Go中没有太多的实现方法。

.Net framework中的HttpContext类。您还可以将时间戳存储在请求处理程序函数的第一行。

最简单的方法是获取处理程序中的当前时间

type Handler struct {
}

func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
  rs := time.Now().UTC()

  //TODO: Use the time.
}

如果您想测量处理程序之前的所有中间件所花费的时间，那么您可以更新Go上下文，并将中间件放在中间件链的开头

下面是该中间件的示例：

package timemiddleware

import (
    "context"
    "net/http"
    "time"
)

// New returns new middleware which tracks the time that a request started.
func New(next http.Handler) http.Handler {
    return handler{
        next: next,
    }
}

type key int

const id = key(1)

type handler struct {
    next http.Handler
}

func (h handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    ctx := context.WithValue(r.Context(), id, time.Now().UTC())
    h.next.ServeHTTP(w, r.WithContext(ctx))
}

// GetTime returns time from the current request, where it has previously been added by the middleware.
func GetTime(r *http.Request) (t time.Time, ok bool) {
    v := r.Context().Value(id)
    t, ok = v.(time.Time)
    return
}

您可以按照以下示例使用此选项：

包干管

import (
    "fmt"
    "net/http"
    "time"

    "github.com/xxxxx/timemiddleware"
)

func main() {
    next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        time.Sleep(time.Second * 5)
        w.Write([]byte("Hello"))
        if t, ok := timemiddleware.GetTime(r); ok {
            fmt.Println(t)
            fmt.Println(time.Now().UTC())
        }
    })

    h := timemiddleware.New(next)
    fmt.Println(http.ListenAndServe("0.0.0.0:8080", h))
}

import (
    "fmt"
    "net/http"
    "time"

    "github.com/xxxxx/timemiddleware"
)

func main() {
    next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        time.Sleep(time.Second * 5)
        w.Write([]byte("Hello"))
        if t, ok := timemiddleware.GetTime(r); ok {
            fmt.Println(t)
            fmt.Println(time.Now().UTC())
        }
    })

    h := timemiddleware.New(next)
    fmt.Println(http.ListenAndServe("0.0.0.0:8080", h))
}