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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())
s.tlock.RLock()
defer s.tlock.RUnlock()
var t *template.Template
var err error
if s.templates[templateFname] == nil {
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)
}
ln.Log(context.Background(), ln.F{"action": "loaded_new_template", "fname": templateFname})
s.tlock.RUnlock()
s.tlock.Lock()
s.templates[templateFname] = t
s.tlock.Unlock()
s.tlock.RLock()
} else {
t = s.templates[templateFname]
}
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)
}
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