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 //  This source code is part of the near-RT RIC (RAN Intelligent Controller)
  18 //  platform project (RICP).
  19
  20
  21 package controllers
  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         ResourceStatus(writer http.ResponseWriter, r *http.Request)
  42 }
  43
  44 type Controller struct {
  45         logger          *logger.Logger
  46         handlerProvider *httpmsghandlerprovider.RequestHandlerProvider
  47 }
  48
  49 func NewController(logger *logger.Logger, handlerProvider *httpmsghandlerprovider.RequestHandlerProvider) *Controller {
  50         return &Controller{
  51                 logger:          logger,
  52                 handlerProvider: handlerProvider,
  53         }
  54 }
  55
  56 func (c *Controller) ResourceStatus(writer http.ResponseWriter, r *http.Request) {
  57         c.logger.Infof("[Client -> RSM] #Controller.ResourceStatus - request: %v", c.prettifyRequest(r))
  58
  59         request := models.ResourceStatusRequest{}
  60
  61         if !c.extractJsonBody(r, &request, writer) {
  62                 return
  63         }
  64
  65         c.handleRequest(writer, &r.Header, httpmsghandlerprovider.ResourceStatusRequest, request, true)
  66 }
  67
  68 func (c *Controller) extractJsonBody(r *http.Request, request models.Request, writer http.ResponseWriter) bool {
  69         defer r.Body.Close()
  70         body, err := ioutil.ReadAll(io.LimitReader(r.Body, LimitRequest))
  71
  72         if err != nil {
  73                 c.logger.Errorf("[Client -> RSM] #Controller.extractJsonBody - unable to extract json body - error: %s", err)
  74                 c.handleErrorResponse(rsmerrors.NewInvalidJsonError(), writer)
  75                 return false
  76         }
  77
  78         err = json.Unmarshal(body, &request)
  79         if err != nil {
  80                 c.logger.Errorf("[Client -> RSM] #Controller.extractJsonBody - unable to extract json body - error: %s", err)
  81                 c.handleErrorResponse(rsmerrors.NewInvalidJsonError(), writer)
  82                 return false
  83         }
  84
  85         return true
  86 }
  87
  88 func (c *Controller) handleRequest(writer http.ResponseWriter, header *http.Header, requestName httpmsghandlerprovider.IncomingRequest, request models.Request, validateHeader bool) {
  89
  90         if validateHeader {
  91
  92                 err := c.validateRequestHeader(header)
  93                 if err != nil {
  94                         c.handleErrorResponse(err, writer)
  95                         return
  96                 }
  97         }
  98
  99         handler, err := c.handlerProvider.GetHandler(requestName)
 100
 101         if err != nil {
 102                 c.handleErrorResponse(err, writer)
 103                 return
 104         }
 105
 106         err = handler.Handle(request)
 107
 108         if err != nil {
 109                 c.handleErrorResponse(err, writer)
 110                 return
 111         }
 112
 113         writer.WriteHeader(http.StatusNoContent)
 114         c.logger.Infof("[RSM -> Client] #Controller.handleRequest - status response: %v", http.StatusNoContent)
 115 }
 116
 117 func (c *Controller) validateRequestHeader(header *http.Header) error {
 118
 119         if header.Get("Content-Type") != "application/json" {
 120                 c.logger.Errorf("#Controller.validateRequestHeader - validation failure, incorrect content type")
 121
 122                 return rsmerrors.NewHeaderValidationError()
 123         }
 124         return nil
 125 }
 126
 127 func (c *Controller) handleErrorResponse(err error, writer http.ResponseWriter) {
 128
 129         var errorResponseDetails models.ErrorResponse
 130         var httpError int
 131
 132         if err != nil {
 133                 switch err.(type) {
 134                 case *rsmerrors.RnibDbError:
 135                         e2Error, _ := err.(*rsmerrors.RnibDbError)
 136                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Code, Message: e2Error.Message}
 137                         httpError = http.StatusInternalServerError
 138                 case *rsmerrors.HeaderValidationError:
 139                         e2Error, _ := err.(*rsmerrors.HeaderValidationError)
 140                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Code, Message: e2Error.Message}
 141                         httpError = http.StatusUnsupportedMediaType
 142                 case *rsmerrors.WrongStateError:
 143                         e2Error, _ := err.(*rsmerrors.WrongStateError)
 144                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Code, Message: e2Error.Message}
 145                         httpError = http.StatusBadRequest
 146                 case *rsmerrors.RequestValidationError:
 147                         e2Error, _ := err.(*rsmerrors.RequestValidationError)
 148                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Code, Message: e2Error.Message}
 149                         httpError = http.StatusBadRequest
 150                 case *rsmerrors.InvalidJsonError:
 151                         e2Error, _ := err.(*rsmerrors.InvalidJsonError)
 152                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Code, Message: e2Error.Message}
 153                         httpError = http.StatusBadRequest
 154                 case *rsmerrors.RmrError:
 155                         e2Error, _ := err.(*rsmerrors.RmrError)
 156                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Code, Message: e2Error.Message}
 157                         httpError = http.StatusInternalServerError
 158                 case *rsmerrors.RsmError:
 159                         e2Error, _ := err.(*rsmerrors.RsmError)
 160                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Code, Message: e2Error.Message}
 161                         httpError = http.StatusInternalServerError
 162                 case *rsmerrors.ResourceNotFoundError:
 163                         e2Error, _ := err.(*rsmerrors.ResourceNotFoundError)
 164                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Code, Message: e2Error.Message}
 165                         httpError = http.StatusNotFound
 166
 167                 default:
 168                         e2Error := rsmerrors.NewInternalError()
 169                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Code, Message: e2Error.Message}
 170                         httpError = http.StatusInternalServerError
 171                 }
 172         }
 173         errorResponse, _ := json.Marshal(errorResponseDetails)
 174
 175         c.logger.Errorf("[RSM -> Client] #Controller.handleErrorResponse - http status: %d, error response: %+v", httpError, errorResponseDetails)
 176
 177         writer.Header().Set("Content-Type", "application/json")
 178         writer.WriteHeader(httpError)
 179         _, err = writer.Write(errorResponse)
 180
 181         if err != nil {
 182                 c.logger.Errorf("#Controller.handleErrorResponse - Cannot send response. writer:%v", writer)
 183         }
 184 }
 185 func (c *Controller) prettifyRequest(request *http.Request) string {
 186         dump, _ := httputil.DumpRequest(request, true)
 187         requestPrettyPrint := strings.Replace(string(dump), "\r\n", " ", -1)
 188         return strings.Replace(requestPrettyPrint, "\n", "", -1)
 189 }