Beispiel #1
0
// pushStackHandler adds an element into a Stack and returns 200 and the element.
func (c *Conn) pushStackHandler(w http.ResponseWriter, r *http.Request, stack *pila.Stack) {
	if r.Body == nil {
		log.Println(r.Method, r.URL, http.StatusBadRequest,
			"no element provided")
		w.WriteHeader(http.StatusBadRequest)
		return
	}

	var element pila.Element
	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
	}

	stack.Push(element.Value)
	stack.Update(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)
}
Beispiel #2
0
// statusStackHandler returns the status of the Stack.
func (c *Conn) statusStackHandler(w http.ResponseWriter, r *http.Request, stack *pila.Stack) {
	stack.Read(c.opDate)
	log.Println(r.Method, r.URL, http.StatusOK)
	w.Header().Set("Content-Type", "application/json")

	// Do not check error as we consider that a flushed
	// stack has no JSON encoding issues.
	b, _ := stack.Status().ToJSON()
	w.Write(b)
}
Beispiel #3
0
// deleteStackHandler deletes the Stack from a database.
func (c *Conn) deleteStackHandler(w http.ResponseWriter, r *http.Request, database *pila.Database, stack *pila.Stack) {
	stack.Flush()

	// Do not check output as we validated that
	// stack always exists.
	_ = database.RemoveStack(stack.ID)

	log.Println(r.Method, r.URL, http.StatusNoContent)
	w.WriteHeader(http.StatusNoContent)
	return
}
Beispiel #4
0
// 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)
}
Beispiel #5
0
// popStackHandler extracts the peek element of a Stack, returns 200 and returns it.
func (c *Conn) popStackHandler(w http.ResponseWriter, r *http.Request, stack *pila.Stack) {
	value, ok := stack.Pop()
	if !ok {
		log.Println(r.Method, r.URL, http.StatusNoContent)
		w.WriteHeader(http.StatusNoContent)
		return
	}
	stack.Update(c.opDate)

	element := pila.Element{Value: value}

	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)
}
Beispiel #6
0
// sizeStackHandler returns the size of the Stack.
func (c *Conn) sizeStackHandler(w http.ResponseWriter, r *http.Request, stack *pila.Stack) {
	stack.Read(c.opDate)
	log.Println(r.Method, r.URL, http.StatusOK, stack.Size())
	w.Header().Set("Content-Type", "application/json")

	// Do not check error as we consider the size
	// of a stack valid for a JSON encoding.
	w.Write(stack.SizeToJSON())
}