func TrapKillSignals() {
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGINT)
signal.Notify(c, syscall.SIGTERM)
signal.Notify(c, syscall.SIGKILL)
go func() {
for range c {
log.Println("Caught a fatal signal. Terminating.")
app.CallExitFuncs()
os.Exit(1)
}
}()
}
func main() {
flag.Parse()
// Make sure exit functions get called. This program has no normal exit -- it either dies from panics
// or from catching fatal signals. The former case is handled by defer. The latter case is handled
// by TrapKillSignals.
defer app.CallExitFuncs()
TrapKillSignals()
if !*stderr {
// Set up log file.
logname := path.Join(os.Getenv("HOME"), "server.log")
err := os.Rename(logname, fmt.Sprintf(
"%s.%s.%d", logname, time.Now().Format("2006-01-02"), time.Now().Unix()))
if err != nil && !os.IsNotExist(err) {
log.Fatalln(err)
}
logfile, err := os.Create(logname)
checkInitError(err)
app.RunAtExit(func() { logfile.Close() })
log.Println("Subsequent log messages will go to disk, not stderr.")
log.SetOutput(logfile)
} else {
log.Println("Logging to stderr.")
}
log.Println("Starting server.")
// Static files.
pwd, err := os.Getwd()
checkInitError(err)
http.Handle("/", http.FileServer(http.Dir(path.Join(pwd, "static-files"))))
// Special handler for static graphs.
http.Handle("/graph/", http.StripPrefix("/graph/", http.FileServer(http.Dir(app.TempGraphDir))))
// Visualization builder.
http.HandleFunc("/visualize", visualizeHandler)
// Loading page.
template.Must(template.ParseFiles("templates/loading.html")) // Sanity check.
http.HandleFunc("/loading", loadingHandler)
// Dashboard page.
template.Must(template.ParseFiles("templates/dashboard.html")) // Sanity check.
http.HandleFunc("/dashboard", dashboardHandler)
// Contact info signup.
smtpPassword = os.Getenv("EMAIL_CHARTS_SMTP_PASSWORD")
if smtpPassword == "" {
log.Println("Must set EMAIL_CHARTS_SMTP_PASSWORD")
return
}
http.HandleFunc("/staytuned", signupHandler)
ok := func(w http.ResponseWriter, _ *http.Request) {
w.Write([]byte("ok"))
}
http.HandleFunc("/_ah/start", ok)
http.HandleFunc("/_ah/health", ok)
log.Printf(http.ListenAndServe(*httpAddr, Log(http.DefaultServeMux)).Error())
}
