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package main
import (
"context"
"encoding/json"
"flag"
"fmt"
"log"
"net/http"
"os"
"time"
)
const VTT_URL string = "http://73.188.175.49:30000"
func remoteOnline(ctx context.Context, url string) bool {
req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
if err != nil {
panic(err)
}
_, err = http.DefaultClient.Do(req)
if err != nil {
return false
}
return true
}
func respondOnline(w http.ResponseWriter, url string, isOnline bool) {
data := struct {
Online bool `json:"online"`
Site string `json:"url"`
}{isOnline, url}
jsonData, err := json.Marshal(data)
if err != nil {
http.Error(w, "Error constructing response", http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(jsonData)
}
func vttOnline(w http.ResponseWriter, req *http.Request) {
isOnline := remoteOnline(req.Context(), VTT_URL)
if !isOnline {
log.Println("Foundry VTT is offline")
}
respondOnline(w, VTT_URL, isOnline)
}
func vttRedirect(w http.ResponseWriter, req *http.Request) {
http.Redirect(w, req, VTT_URL, http.StatusMovedPermanently)
}
func siteOnline(w http.ResponseWriter, req *http.Request) {
const URL string = "https://dnd.jpappel.xyz"
isOnline := remoteOnline(req.Context(), URL)
if !isOnline {
log.Println("Campaign Website is offline")
}
respondOnline(w, URL, isOnline)
}
func timeoutMiddleware(next http.Handler, duration time.Duration) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx, cancel := context.WithTimeout(r.Context(), duration)
defer cancel()
next.ServeHTTP(w, r.WithContext(ctx))
})
}
func main() {
port := flag.Int("p", 8080, "the port to listen on")
bindAddr := flag.String("b", "", "the adress to bind to (leave empty for all interfaces)")
waitTime := flag.Duration("w", 2*time.Second, "the maximum time for a request, unit defaults to ns")
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage: %s [options]\n", os.Args[0])
fmt.Fprintln(os.Stderr, "Options:")
flag.PrintDefaults()
}
flag.Parse()
addr := fmt.Sprintf("%s:%d", *bindAddr, *port)
mux := http.NewServeMux()
vtt := timeoutMiddleware(http.HandlerFunc(vttOnline), *waitTime)
site := timeoutMiddleware(http.HandlerFunc(siteOnline), *waitTime)
mux.Handle("GET /vtt/status", vtt)
mux.HandleFunc("GET /vtt", vttRedirect)
mux.Handle("GET /site/status", site)
log.Println("Listening on ", addr)
log.Fatal(http.ListenAndServe(addr, mux))
}
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