使用Singleflight实现Golang代码优化

// server.go
package main
import (
	"fmt"
	"net/http"
)
func main() {
	http.HandleFunc("/api/v1/get_something", func(w http.ResponseWriter, r *http.Request) {
		name := r.URL.Query().Get("name")
		response := processingRequest(name)
		_, _ = fmt.Fprint(w, response)
	})
	err := http.ListenAndServe(":15001", nil)
	if err != nil {
		fmt.Println(err)
	}
}
func processingRequest(name string) string {
	fmt.Println("[DEBUG] processing request..")
	return "Hi there! You requested " + name
}

// client.go
package main
import (
	"io"
	"log"
	"net/http"
	"sync"
)
func main() {
	var wg sync.WaitGroup
	endpoint := "http://localhost:15001/api/v1/get_something?name=something"
	totalRequests := 5
	for i := 0; i < totalRequests; i++ {
		wg.Add(1)
		go func(i int) {
			defer wg.Done()
			makeAPICall(endpoint)
		}(i)
	}
	wg.Wait()
}
func makeAPICall(endpoint string) {
	resp, err := http.Get(endpoint)
	if err != nil {
		log.Fatalln(err)
	}
	body, err := io.ReadAll(resp.Body)
	if err != nil {
		log.Fatalln(err)
	}
	result := string(body)
	log.Printf(result)
}

// server.go
package main
import (
	"fmt"
	"net/http"
	"golang.org/x/sync/singleflight"
)
var g = singleflight.Group{}
func main() {
	http.HandleFunc("/api/v1/get_something", func(w http.ResponseWriter, r *http.Request) {
		name := r.URL.Query().Get("name")
		response, _, _ := g.Do(name, func() (interface{}, error) {
			result := processingRequest(name)
			return result, nil
		})
		_, _ = fmt.Fprint(w, response)
	})
	err := http.ListenAndServe(":15001", nil)
	if err != nil {
		fmt.Println(err)
	}
}
func processingRequest(name string) string {
	fmt.Println("[DEBUG] processing request..")
	return "Hi there! You requested " + name
}