E2Manager/controllers/e2t_controller.go

   1 //
   2 // Copyright 2019 AT&T Intellectual Property
   3 // Copyright 2019 Nokia
   4 //
   5 // Licensed under the Apache License, Version 2.0 (the "License");
   6 // you may not use this file except in compliance with the License.
   7 // You may obtain a copy of the License at
   8 //
   9 //      http://www.apache.org/licenses/LICENSE-2.0
  10 //
  11 // Unless required by applicable law or agreed to in writing, software
  12 // distributed under the License is distributed on an "AS IS" BASIS,
  13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 // See the License for the specific language governing permissions and
  15 // limitations under the License.
  16 //
  17
  18 package controllers
  19
  20 import (
  21         "e2mgr/e2managererrors"
  22         "e2mgr/logger"
  23         "e2mgr/models"
  24         "e2mgr/providers/httpmsghandlerprovider"
  25         "encoding/json"
  26         "net/http"
  27         "net/http/httputil"
  28         "strings"
  29 )
  30
  31 type IE2TController interface {
  32         GetE2TInstances(writer http.ResponseWriter, r *http.Request)
  33 }
  34
  35 type E2TController struct {
  36         logger          *logger.Logger
  37         handlerProvider *httpmsghandlerprovider.IncomingRequestHandlerProvider
  38 }
  39
  40 func NewE2TController(logger *logger.Logger, handlerProvider *httpmsghandlerprovider.IncomingRequestHandlerProvider) *E2TController {
  41         return &E2TController{
  42                 logger:          logger,
  43                 handlerProvider: handlerProvider,
  44         }
  45 }
  46
  47 func (c *E2TController) GetE2TInstances(writer http.ResponseWriter, r *http.Request) {
  48         c.logger.Infof("[Client -> E2 Manager] #E2TController.GetE2TInstances - request: %v", c.prettifyRequest(r))
  49         c.handleRequest(writer, &r.Header, httpmsghandlerprovider.GetE2TInstancesRequest, nil, false)
  50 }
  51
  52 func (c *E2TController) handleRequest(writer http.ResponseWriter, header *http.Header, requestName httpmsghandlerprovider.IncomingRequest, request models.Request, validateHeader bool) {
  53
  54         handler, err := c.handlerProvider.GetHandler(requestName)
  55
  56         if err != nil {
  57                 c.handleErrorResponse(err, writer)
  58                 return
  59         }
  60
  61         response, err := handler.Handle(request)
  62
  63         if err != nil {
  64                 c.handleErrorResponse(err, writer)
  65                 return
  66         }
  67
  68         if response == nil {
  69                 writer.WriteHeader(http.StatusNoContent)
  70                 c.logger.Infof("[E2 Manager -> Client] #E2TController.handleRequest - status response: %v", http.StatusNoContent)
  71                 return
  72         }
  73
  74         result, err := response.Marshal()
  75
  76         if err != nil {
  77                 c.handleErrorResponse(err, writer)
  78                 return
  79         }
  80
  81         c.logger.Infof("[E2 Manager -> Client] #E2TController.handleRequest - response: %s", result)
  82         writer.Header().Set("Content-Type", "application/json")
  83         writer.Write(result)
  84 }
  85
  86 func (c *E2TController) handleErrorResponse(err error, writer http.ResponseWriter) {
  87
  88         var errorResponseDetails models.ErrorResponse
  89         var httpError int
  90
  91         if err != nil {
  92                 switch err.(type) {
  93                 case *e2managererrors.RnibDbError:
  94                         e2Error, _ := err.(*e2managererrors.RnibDbError)
  95                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Code, Message: e2Error.Message}
  96                         httpError = http.StatusInternalServerError
  97                 default:
  98                         e2Error := e2managererrors.NewInternalError()
  99                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Code, Message: e2Error.Message}
 100                         httpError = http.StatusInternalServerError
 101                 }
 102         }
 103
 104         errorResponse, _ := json.Marshal(errorResponseDetails)
 105
 106         c.logger.Errorf("[E2 Manager -> Client] #E2TController.handleErrorResponse - http status: %d, error response: %+v", httpError, errorResponseDetails)
 107
 108         writer.Header().Set("Content-Type", "application/json")
 109         writer.WriteHeader(httpError)
 110         _, err = writer.Write(errorResponse)
 111
 112         if err != nil {
 113                 c.logger.Errorf("#E2TController.handleErrorResponse - Cannot send response. writer:%v", writer)
 114         }
 115 }
 116
 117 func (c *E2TController) prettifyRequest(request *http.Request) string {
 118         dump, _ := httputil.DumpRequest(request, true)
 119         requestPrettyPrint := strings.Replace(string(dump), "\r\n", " ", -1)
 120         return strings.Replace(requestPrettyPrint, "\n", "", -1)
 121 }