cache space invader route. (01d4d4f8) · Commits · blackheaven / tinygraphs

colors/colors.go

+11 −0

Original line number	Diff line number	Diff line
		package colors

		import (
		"fmt"
		"image/color"
		)

		@@ -86,3 +87,13 @@ func MapOfColorThemes() map[string][]color.RGBA {
		},
		}
		}

		func ArrayToHexString(colors []color.RGBA) (s string) {
		for _, c := range colors {
		s = s + ToHexString(c)
		}
		return
		}
		func ToHexString(c color.RGBA) string {
		return fmt.Sprintf("#%02X%02X%02X", c.R, c.G, c.B)
		}

+19 −0

Original line number	Diff line number	Diff line
		@@ -3,11 +3,14 @@ package spaceinvaders
		import (
		"crypto/md5"
		"fmt"
		"image/color"
		"io"
		"log"
		"net/http"
		"strings"

		"github.com/taironas/route"
		tgColors "github.com/taironas/tinygraphs/colors"
		"github.com/taironas/tinygraphs/draw/spaceinvaders"
		"github.com/taironas/tinygraphs/extract"
		"github.com/taironas/tinygraphs/write"
		@@ -28,7 +31,23 @@ func SpaceInvaders(w http.ResponseWriter, r *http.Request) {

		colors := extract.Colors(r)
		size := extract.Size(r)
		if isCached(&w, r, key, colors, size) {
		w.WriteHeader(http.StatusNotModified)
		return
		}

		write.ImageSVG(w)
		spaceinvaders.SpaceInvaders(w, key, colors, size)
		}

		func isCached(w http.ResponseWriter, r http.Request, key string, colors []color.RGBA, size int) bool {
		e := `"` + key + tgColors.ArrayToHexString(colors) + fmt.Sprintf("%d", size) + `"`
		(*w).Header().Set("Etag", e)
		(*w).Header().Set("Cache-Control", "max-age=2592000") // 30 days
		if match := r.Header.Get("If-None-Match"); match != "" {
		if strings.Contains(match, e) {
		return true
		}
		}
		return false
		}