func main() {
dataDirectory := flag.String("d", defaultDataDirectory, "Directory where dictionary files are located")
serviceListenPort := flag.Int("p", defaultServiceListenPort, "Service Listen Port")
adminListenPort := flag.Int("a", defaultAdminListenPort, "Admin Listen Port")
allowedOrigin := flag.String("c", handlers.AllowedOrigin, "CORS Allowed Origin")
flag.Parse()
log.Printf("Using data directory %s", *dataDirectory)
handlers.DataDirectory = *dataDirectory
handlers.LoadDictionaries()
r := mux.NewRouter()
r.HandleFunc("/twocents", handlers.MetaVersionsHandler).Methods("GET")
r.HandleFunc("/twocents/{version:v1}", handlers.MetaDictionariesHandler).Methods("GET")
r.HandleFunc("/twocents/{version:v1}/{dictionary}/{query}", handlers.TwoCentsHandlerV1).Methods("GET")
r.HandleFunc("/twocents/{version:v1}/{dictionary}/{query}/{limit:[0-9]+}", handlers.TwoCentsHandlerV1).Methods("GET")
r.HandleFunc("/twocents/{version:v1}/{dictionary}/{query}/{limit:[0-9]+}/{filter}", handlers.TwoCentsHandlerV1).Methods("GET")
http.Handle("/", r)
log.Printf("Service listening on port %d", *serviceListenPort)
go func() {
log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", *serviceListenPort), nil))
}()
log.Printf("Admin listening on port %d", *adminListenPort)
if *allowedOrigin != "" {
log.Printf("Setting CORS Origin to %s", *allowedOrigin)
handlers.AllowedOrigin = *allowedOrigin
}
//TODO: Find a better way to pass a different router to the admin server
http.ListenAndServe(fmt.Sprintf(":%d", *adminListenPort), &adminHandler{})
}
func (m *adminHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if !strings.HasPrefix(r.RequestURI, "/twocents/admin/reload") {
http.NotFound(w, r)
return
}
// Ensure that multiple reloads never occur simultaneously, and that multiple requests don't queue up.
// The sync library doesn't seem to have a trylock mechanism, so use atomic CAS
locked := atomic.CompareAndSwapUint32(&reloadLock, 0, 1)
if locked {
w.Write([]byte("Dicionary reload initiated\n"))
go func() {
defer atomic.StoreUint32(&reloadLock, 0)
handlers.LoadDictionaries()
}()
} else {
w.Write([]byte("Dictionary reload already in progress\n"))
}
}