// configKeyHandler handles a config value.
func (c *Conn) configKeyHandler(configKey string) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
// we override the mux vars to be able to test
// an arbitrary configKey
if configKey != "" {
vars = map[string]string{
"key": configKey,
}
}
value := c.Config.Get(vars["key"])
if value == nil {
c.goneHandler(w, r, fmt.Sprintf("%s is not set", vars["key"]))
return
}
var element pila.Element
if r.Method == "GET" {
value := c.Config.Get(vars["key"])
element.Value = value
}
if r.Method == "POST" {
if r.Body == nil {
log.Println(r.Method, r.URL, http.StatusBadRequest,
"no element provided")
w.WriteHeader(http.StatusBadRequest)
return
}
err := element.Decode(r.Body)
if err != nil {
log.Println(r.Method, r.URL, http.StatusBadRequest,
"error on decoding element:", err)
w.WriteHeader(http.StatusBadRequest)
return
}
c.Config.Set(vars["key"], element.Value)
}
log.Println(r.Method, r.URL, http.StatusOK, element.Value)
w.Header().Set("Content-Type", "application/json")
b, err := element.ToJSON()
if err != nil {
log.Println(r.Method, r.URL, http.StatusBadRequest,
"error on decoding element:", err)
w.WriteHeader(http.StatusBadRequest)
return
}
w.Write(b)
})
}
// peekStackHandler returns the peek of the Stack without modifying it.
func (c *Conn) peekStackHandler(w http.ResponseWriter, r *http.Request, stack *pila.Stack) {
var element pila.Element
element.Value = stack.Peek()
stack.Read(c.opDate)
log.Println(r.Method, r.URL, http.StatusOK, element.Value)
w.Header().Set("Content-Type", "application/json")
// Do not check error as we consider our element
// suitable for a JSON encoding.
b, _ := element.ToJSON()
w.Write(b)
}