shibukawa/testserver.go

## testserver.go
package main

import (
	"fmt"
	"github.com/k0kubun/pp"
	"log"
	"net/http"
	"os"
	"strconv"
)

type Cache struct {
	CacheControl string
	Etag         string
	Reject       bool
	Content      string
}

var cache = map[string]Cache{
	"/": Cache{
		Reject:  false,
		Content: `<html><body>hello</body><script src="/test.js"></script></html>`,
	},
	"/test.js": Cache{
		Reject:  false,
		Content: `console.log("test.js loaded");`,
	},
	"/favicon.ico": Cache{
		Reject: true,
	},
}

var strategyId int

var cacheControls = []string{
	"no-cache, max-age=5",
	"no-cache, max-age=0",
	"must-revalidate, max-age=5",
	"must-revalidate, max-age=0",
}

func useIf(flag bool, value string) string {
	if flag {
		return value
	}
	return ""
}

func getStrategy(filename string) Cache {
	id := strategyId - 1
	if filename == "/" {
		return Cache{
			Etag:         useIf((id/32)%2 == 0, "1234"),
			CacheControl: cacheControls[(id/4)%4],
			Reject:       false,
			Content:      `<html><body>hello</body><script src="/test.js"></script></html>`,
		}
	} else if filename == "/test.js" {
		return Cache{
			Etag:         useIf((id/16)%2 == 0, "5678"),
			CacheControl: cacheControls[id%4],
			Reject:       false,
			Content:      `console.log("test.js loaded");`,
		}
	}
	return Cache{
		Reject:  true,
		Content: "",
	}
}

func handler(w http.ResponseWriter, r *http.Request) {
	etags, ok := r.Header["If-None-Match"]
	if ok {
		pp.Println("request", r.Method, r.URL.String(), etags[0])
	} else {
		pp.Println("request", r.Method, r.URL.String())
	}
	strategy := getStrategy(r.URL.String())
	if strategy.Reject {
		// favicon.ico
		fmt.Println("    Status:", http.StatusNotFound)
		w.WriteHeader(http.StatusNotFound)
		return
	}
	if ok {
		fmt.Println("    Status:", http.StatusNotModified)
		w.WriteHeader(http.StatusNotModified)
		return
	} else {
		fmt.Println("    Status:", http.StatusOK)
	}
	if strategy.Etag != "" {
		fmt.Println("    Etag:", strategy.Etag)
		w.Header().Set("Etag", strategy.Etag)
	}
	fmt.Println("    Cache-Control:", strategy.CacheControl)
	w.Header().Set("Cache-Control", strategy.CacheControl)
	fmt.Fprintf(w, strategy.Content)
}

func main() {
	strategyId, _ = strconv.Atoi(os.Args[1])
	if strategyId > 64 || strategyId < 1 {
		log.Fatalf("wrong id: %d", strategyId)
	}
	var httpServer http.Server

	http.HandleFunc("/", handler)

	log.Println("start http listening :18888")
	httpServer.Addr = ":18888"
	log.Println(httpServer.ListenAndServe())
}
	package main

	import (
	"fmt"
	"github.com/k0kubun/pp"
	"log"
	"net/http"
	"os"
	"strconv"
	)

	type Cache struct {
	CacheControl string
	Etag string
	Reject bool
	Content string
	}

	var cache = map[string]Cache{
	"/": Cache{
	Reject: false,
	Content: `<html><body>hello</body><script src="/test.js"></script></html>`,
	},
	"/test.js": Cache{
	Reject: false,
	Content: `console.log("test.js loaded");`,
	},
	"/favicon.ico": Cache{
	Reject: true,
	},
	}

	var strategyId int

	var cacheControls = []string{
	"no-cache, max-age=5",
	"no-cache, max-age=0",
	"must-revalidate, max-age=5",
	"must-revalidate, max-age=0",
	}

	func useIf(flag bool, value string) string {
	if flag {
	return value
	}
	return ""
	}

	func getStrategy(filename string) Cache {
	id := strategyId - 1
	if filename == "/" {
	return Cache{
	Etag: useIf((id/32)%2 == 0, "1234"),
	CacheControl: cacheControls[(id/4)%4],
	Reject: false,
	Content: `<html><body>hello</body><script src="/test.js"></script></html>`,
	}
	} else if filename == "/test.js" {
	return Cache{
	Etag: useIf((id/16)%2 == 0, "5678"),
	CacheControl: cacheControls[id%4],
	Reject: false,
	Content: `console.log("test.js loaded");`,
	}
	}
	return Cache{
	Reject: true,
	Content: "",
	}
	}

	func handler(w http.ResponseWriter, r *http.Request) {
	etags, ok := r.Header["If-None-Match"]
	if ok {
	pp.Println("request", r.Method, r.URL.String(), etags[0])
	} else {
	pp.Println("request", r.Method, r.URL.String())
	}
	strategy := getStrategy(r.URL.String())
	if strategy.Reject {
	// favicon.ico
	fmt.Println(" Status:", http.StatusNotFound)
	w.WriteHeader(http.StatusNotFound)
	return
	}
	if ok {
	fmt.Println(" Status:", http.StatusNotModified)
	w.WriteHeader(http.StatusNotModified)
	return
	} else {
	fmt.Println(" Status:", http.StatusOK)
	}
	if strategy.Etag != "" {
	fmt.Println(" Etag:", strategy.Etag)
	w.Header().Set("Etag", strategy.Etag)
	}
	fmt.Println(" Cache-Control:", strategy.CacheControl)
	w.Header().Set("Cache-Control", strategy.CacheControl)
	fmt.Fprintf(w, strategy.Content)
	}

	func main() {
	strategyId, _ = strconv.Atoi(os.Args[1])
	if strategyId > 64 \|\| strategyId < 1 {
	log.Fatalf("wrong id: %d", strategyId)
	}
	var httpServer http.Server

	http.HandleFunc("/", handler)

	log.Println("start http listening :18888")
	httpServer.Addr = ":18888"
	log.Println(httpServer.ListenAndServe())
	}