package main import ( "context" "fmt" "html/template" "net/http" "time" "within.website/ln" ) func logTemplateTime(name string, f ln.F, from time.Time) { now := time.Now() ln.Log(context.Background(), f, ln.F{"action": "template_rendered", "dur": now.Sub(from).String(), "name": name}) } func (s *Site) renderTemplatePage(templateFname string, data interface{}) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { fetag := "W/" + Hash(templateFname, etag) + "-1" f := ln.F{"etag": fetag, "if_none_match": r.Header.Get("If-None-Match")} if r.Header.Get("If-None-Match") == fetag { http.Error(w, "Cached data OK", http.StatusNotModified) ln.Log(r.Context(), f, ln.Info("Cache hit")) return } defer logTemplateTime(templateFname, f, time.Now()) var t *template.Template var err error t, err = template.ParseFiles("templates/base.html", "templates/"+templateFname) if err != nil { w.WriteHeader(http.StatusInternalServerError) ln.Error(context.Background(), err, ln.F{"action": "renderTemplatePage", "page": templateFname}) fmt.Fprintf(w, "error: %v", err) } w.Header().Set("ETag", fetag) w.Header().Set("Cache-Control", "max-age=432000") err = t.Execute(w, data) if err != nil { panic(err) } }) } func (s *Site) showPost(w http.ResponseWriter, r *http.Request) { if r.RequestURI == "/blog/" { http.Redirect(w, r, "/blog", http.StatusSeeOther) return } cmp := r.URL.Path[1:] var p *Post for _, pst := range s.Posts { if pst.Link == cmp { p = pst } } if p == nil { w.WriteHeader(http.StatusNotFound) s.renderTemplatePage("error.html", "no such post found: "+r.RequestURI).ServeHTTP(w, r) return } s.renderTemplatePage("blogpost.html", p).ServeHTTP(w, r) }