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api_nodesession_handler.go
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/
api_nodesession_handler.go
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package loraserver
import (
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"net/http"
log "github.com/Sirupsen/logrus"
"github.com/brocaar/loracontrol"
"github.com/brocaar/lorawan"
"github.com/gorilla/mux"
)
// NodeSessionCreateHandler is a http.Handler which creates NodeSession objects.
type NodeSessionCreateHandler struct {
Client *loracontrol.Client
}
func (h *NodeSessionCreateHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
defer r.Body.Close()
nodeSession := loracontrol.NodeSession{}
dec := json.NewDecoder(r.Body)
if err := dec.Decode(&nodeSession); err != nil {
APIError{
Code: http.StatusBadRequest,
Message: err.Error(),
}.write(w)
return
}
if err := h.Client.NodeSession().CreateExpire(nodeSession); err != nil {
if err == loracontrol.ErrObjectExists {
APIError{
Code: http.StatusBadRequest,
Message: err.Error(),
}.write(w)
return
}
APIError{
Code: http.StatusInternalServerError,
Message: err.Error(),
}.write(w)
return
}
log.WithField("dev_addr", nodeSession.DevAddr).Info("node-session created")
w.WriteHeader(http.StatusCreated)
}
// NodeSessionObjectHandler is a http.Handler which handles GET, PUT and
// DELETE requests on a single object.
type NodeSessionObjectHandler struct {
Client *loracontrol.Client
}
func (h *NodeSessionObjectHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
defer r.Body.Close()
w.Header().Set("Content-Type", "application/json; charset=utf-8")
vars := mux.Vars(r)
id, ok := vars["id"]
if !ok {
APIError{
Code: http.StatusInternalServerError,
Message: "no id parameter",
}.write(w)
return
}
var devAddr lorawan.DevAddr
b, err := hex.DecodeString(id)
if err != nil {
APIError{
Code: http.StatusBadRequest,
Message: err.Error(),
}.write(w)
return
}
if len(b) != len(devAddr) {
APIError{
Code: http.StatusBadRequest,
Message: fmt.Sprintf("a DevAddr is exactly %d bytes", len(devAddr)),
}.write(w)
return
}
copy(devAddr[:], b)
var status int
switch r.Method {
case "GET":
status, err = h.serveGET(w, r, devAddr)
case "PUT":
status, err = h.servePUT(w, r, devAddr)
case "DELETE":
status, err = h.serveDELETE(w, r, devAddr)
default:
status = http.StatusMethodNotAllowed
}
if err != nil {
APIError{
Code: status,
Message: err.Error(),
}.write(w)
return
}
if status != http.StatusOK {
w.WriteHeader(status)
}
}
func (h *NodeSessionObjectHandler) serveGET(w http.ResponseWriter, r *http.Request, devAddr lorawan.DevAddr) (int, error) {
nodeSession, err := h.Client.NodeSession().Get(devAddr)
if err != nil {
if err == loracontrol.ErrObjectDoesNotExist {
return http.StatusNotFound, err
}
return http.StatusInternalServerError, err
}
enc := json.NewEncoder(w)
if err := enc.Encode(nodeSession); err != nil {
return http.StatusInternalServerError, err
}
return http.StatusOK, nil
}
func (h *NodeSessionObjectHandler) servePUT(w http.ResponseWriter, r *http.Request, devAddr lorawan.DevAddr) (int, error) {
nodeSession := loracontrol.NodeSession{}
dec := json.NewDecoder(r.Body)
if err := dec.Decode(&nodeSession); err != nil {
return http.StatusBadRequest, err
}
if nodeSession.DevAddr != devAddr {
return http.StatusBadRequest, errors.New("DevAddr should match DevAddr in request body")
}
if err := h.Client.NodeSession().UpdateExpire(nodeSession); err != nil {
if err == loracontrol.ErrObjectDoesNotExist {
return http.StatusNotFound, err
}
return http.StatusInternalServerError, err
}
log.WithField("dev_addr", devAddr).Info("node-session updated")
return http.StatusNoContent, nil
}
func (h *NodeSessionObjectHandler) serveDELETE(w http.ResponseWriter, r *http.Request, devAddr lorawan.DevAddr) (int, error) {
if err := h.Client.NodeSession().Delete(devAddr); err != nil {
if err == loracontrol.ErrObjectDoesNotExist {
return http.StatusNotFound, err
}
return http.StatusInternalServerError, err
}
log.WithField("dev_addr", devAddr).Info("node-session deleted")
return http.StatusNoContent, nil
}