RSM/controllers/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 type IController interface {
  21 }
  22 /*
  23 import (
  24         "encoding/json"
  25         "io"
  26         "io/ioutil"
  27         "net/http"
  28         "net/http/httputil"
  29         "rsm/logger"
  30         "rsm/models"
  31         "rsm/providers/httpmsghandlerprovider"
  32         "rsm/rsmerrors"
  33         "strings"
  34 )
  35
  36 const (
  37         LimitRequest = 2000
  38 )
  39
  40 type IController interface {
  41 }
  42
  43 type Controller struct {
  44         logger          *logger.Logger
  45         handlerProvider *httpmsghandlerprovider.RequestHandlerProvider
  46 }
  47
  48 func NewController(logger *logger.Logger, handlerProvider *httpmsghandlerprovider.RequestHandlerProvider) *Controller {
  49         return &Controller{
  50                 logger:          logger,
  51                 handlerProvider: handlerProvider,
  52         }
  53 }
  54
  55 func (c *Controller) extractJsonBody(r *http.Request, request models.Request, writer http.ResponseWriter) bool {
  56         defer r.Body.Close()
  57         body, err := ioutil.ReadAll(io.LimitReader(r.Body, LimitRequest))
  58
  59         if err != nil {
  60                 c.logger.Errorf("[Client -> RSM] #Controller.extractJsonBody - unable to extract json body - error: %s", err)
  61                 c.handleErrorResponse(rsmerrors.NewInvalidJsonError(), writer)
  62                 return false
  63         }
  64
  65         err = json.Unmarshal(body, &request)
  66         if err != nil {
  67                 c.logger.Errorf("[Client -> RSM] #Controller.extractJsonBody - unable to extract json body - error: %s", err)
  68                 c.handleErrorResponse(rsmerrors.NewInvalidJsonError(), writer)
  69                 return false
  70         }
  71
  72         return true
  73 }
  74
  75 func (c *Controller) handleRequest(writer http.ResponseWriter, header *http.Header, requestName httpmsghandlerprovider.IncomingRequest, request models.Request, validateHeader bool) {
  76
  77         if validateHeader {
  78
  79                 err := c.validateRequestHeader(header)
  80                 if err != nil {
  81                         c.handleErrorResponse(err, writer)
  82                         return
  83                 }
  84         }
  85
  86         handler, err := c.handlerProvider.GetHandler(requestName)
  87
  88         if err != nil {
  89                 c.handleErrorResponse(err, writer)
  90                 return
  91         }
  92
  93         response, err := (*handler).Handle(request)
  94
  95         if err != nil {
  96                 c.handleErrorResponse(err, writer)
  97                 return
  98         }
  99
 100         if response == nil {
 101                 writer.WriteHeader(http.StatusNoContent)
 102                 c.logger.Infof("[RSM -> Client] #Controller.handleRequest - status response: %v", http.StatusNoContent)
 103                 return
 104         }
 105
 106         result, err := response.Marshal()
 107
 108         if err != nil {
 109                 c.handleErrorResponse(err, writer)
 110                 return
 111         }
 112
 113         c.logger.Infof("[RSM -> Client] #Controller.handleRequest - response: %s", result)
 114         writer.Header().Set("Content-Type", "application/json")
 115         writer.Write([]byte(result))
 116 }
 117
 118 func (c *Controller) validateRequestHeader(header *http.Header) error {
 119
 120         if header.Get("Content-Type") != "application/json" {
 121                 c.logger.Errorf("#Controller.validateRequestHeader - validation failure, incorrect content type")
 122
 123                 return rsmerrors.NewHeaderValidationError()
 124         }
 125         return nil
 126 }
 127
 128 func (c *Controller) handleErrorResponse(err error, writer http.ResponseWriter) {
 129
 130         var errorResponseDetails models.ErrorResponse
 131         var httpError int
 132
 133         if err != nil {
 134                 switch err.(type) {
 135                 case *rsmerrors.RnibDbError:
 136                         e2Error, _ := err.(*rsmerrors.RnibDbError)
 137                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Code, Message: e2Error.Message}
 138                         httpError = http.StatusInternalServerError
 139                 case *rsmerrors.HeaderValidationError:
 140                         e2Error, _ := err.(*rsmerrors.HeaderValidationError)
 141                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Code, Message: e2Error.Message}
 142                         httpError = http.StatusUnsupportedMediaType
 143                 case *rsmerrors.WrongStateError:
 144                         e2Error, _ := err.(*rsmerrors.WrongStateError)
 145                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Code, Message: e2Error.Message}
 146                         httpError = http.StatusBadRequest
 147                 case *rsmerrors.RequestValidationError:
 148                         e2Error, _ := err.(*rsmerrors.RequestValidationError)
 149                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Code, Message: e2Error.Message}
 150                         httpError = http.StatusBadRequest
 151                 case *rsmerrors.InvalidJsonError:
 152                         e2Error, _ := err.(*rsmerrors.InvalidJsonError)
 153                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Code, Message: e2Error.Message}
 154                         httpError = http.StatusBadRequest
 155                 case *rsmerrors.RmrError:
 156                         e2Error, _ := err.(*rsmerrors.RmrError)
 157                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Code, Message: e2Error.Message}
 158                         httpError = http.StatusInternalServerError
 159                 case *rsmerrors.ResourceNotFoundError:
 160                         e2Error, _ := err.(*rsmerrors.ResourceNotFoundError)
 161                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Code, Message: e2Error.Message}
 162                         httpError = http.StatusNotFound
 163
 164                 default:
 165                         e2Error := rsmerrors.NewInternalError()
 166                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Code, Message: e2Error.Message}
 167                         httpError = http.StatusInternalServerError
 168                 }
 169         }
 170         errorResponse, _ := json.Marshal(errorResponseDetails)
 171
 172         c.logger.Errorf("[RSM -> Client] #Controller.handleErrorResponse - http status: %d, error response: %+v", httpError, errorResponseDetails)
 173
 174         writer.Header().Set("Content-Type", "application/json")
 175         writer.WriteHeader(httpError)
 176         _, err = writer.Write(errorResponse)
 177
 178         if err != nil {
 179                 c.logger.Errorf("#Controller.handleErrorResponse - Cannot send response. writer:%v", writer)
 180         }
 181 }*/
 182 /*
 183 func (c *Controller) prettifyRequest(request *http.Request) string {
 184         dump, _ := httputil.DumpRequest(request, true)
 185         requestPrettyPrint := strings.Replace(string(dump), "\r\n", " ", -1)
 186         return strings.Replace(requestPrettyPrint, "\n", "", -1)
 187 }
 188 */