来自处理程序net/http的Golang缓存结果

Question

无法从缓存中获得结果。只工作请求基地。我需要优化应用程序的许多请求。这是我第一个用歌朗的应用，请原谅我。如何获得缓存结果？

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

    "github.com/ip2location/ip2proxy-go"
    "github.com/patrickmn/go-cache"
)

func main() {
    http.HandleFunc("/", HelloHandler)
    http.ListenAndServe(":8080", nil)
    log.Fatal(http.ListenAndServe(":8080", nil))
}
func HelloHandler(w http.ResponseWriter, r *http.Request) {
    c := cache.New(5*time.Minute, 10*time.Minute)
    ip := r.URL.Query().Get("ip")
    x, found := c.Get(ip)
    if found {
        if x != "0" {
            w.WriteHeader(http.StatusOK)
            fmt.Fprintf(w, "isProxy Cache")
        } else {
            w.WriteHeader(http.StatusNoContent)
            fmt.Fprintf(w, "notProxy Cache")
        }

    } else {
        db, err := ip2proxy.OpenDB("./IP2PROXY-IP-PROXYTYPE-COUNTRY.BIN")
        if err != nil {
            return
        }
        all, err := db.GetAll(ip)
        if err != nil {
            fmt.Print(err)
            return
        }
        isProxy := all["isProxy"]
        c.Set(ip, isProxy, cache.DefaultExpiration)
        if isProxy != "0" {
            w.WriteHeader(http.StatusOK)
            fmt.Fprintf(w, "isProxy ")
        } else {
            w.WriteHeader(http.StatusNoContent)
            fmt.Fprintf(w, "notProxy ")
        }
        db.Close()
    }
}

这:所有“isProxy”返回0，1，-1值。

Answer 1

创建一个全局变量并将缓存存储在那里。示例：

var globalCache *cache.Cache

func main() {
    globalCache = cache.New(5*time.Minute, 10*time.Minute)

    http.HandleFunc("/", HelloHandler)
    http.ListenAndServe(":8080", nil)
    log.Fatal(http.ListenAndServe(":8080", nil))
}

func HelloHandler(w http.ResponseWriter, r *http.Request) {
    // use globalCache
}

更新:不需要原子，因为cache.Cache在内部创建锁。谢谢你纠正我。