ldap_phonebook_caching_html/main.go

package main

/*
Copyright (C) 2023 Steffen Probst

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.

Entwickelt mit Unterstützung von Claude.ai, einem KI-Assistenten von Anthropic, PBC.
*/

import (
	"log"
	"net/http"
	"time"
)

func main() {
	go cacheRefresher()

	http.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.Dir("static"))))
	http.HandleFunc("/", handler)

	log.Printf("Server starting on port %s", serverPort)
	log.Fatal(http.ListenAndServe(":"+serverPort, nil))
}

func cacheRefresher() {
	for {
		newData, err := fetchDataFromLDAP()
		if err != nil {
			log.Printf("Error refreshing cache: %v", err)
		} else if !dataEqual(cachedData, newData) {
			cachedData = newData
			lastUpdate = time.Now()
			log.Println("Cache updated")
		}
		time.Sleep(5 * time.Minute)
	}
}

func handler(w http.ResponseWriter, r *http.Request) {
	log.Printf("Received request for: %s", r.URL.Path)

	if time.Since(lastUpdate) > 5*time.Minute {
		newData, err := fetchDataFromLDAP()
		if err != nil {
			log.Printf("Error refreshing cache: %v", err)
		} else {
			cachedData = newData
			lastUpdate = time.Now()
		}
	}

	err := tmpl.Execute(w, cachedData)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}