E2Manager/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 import (
  21         "e2mgr/configuration"
  22         "e2mgr/e2managererrors"
  23         "e2mgr/logger"
  24         "e2mgr/models"
  25         "e2mgr/providers"
  26         "e2mgr/rNibWriter"
  27         "encoding/json"
  28         "gerrit.o-ran-sc.org/r/ric-plt/nodeb-rnib.git/reader"
  29         "github.com/julienschmidt/httprouter"
  30         "net/http"
  31 )
  32
  33 type Controller struct {
  34         logger         *logger.Logger
  35         handlerProvider *providers.IncomingRequestHandlerProvider
  36         rmrResponseChannel chan<- *models.NotificationResponse
  37 }
  38
  39 func NewController(logger *logger.Logger, rNibReaderProvider func() reader.RNibReader, rNibWriterProvider func() rNibWriter.RNibWriter,
  40         config *configuration.Configuration, rmrResponseChannel chan<- *models.NotificationResponse) *Controller {
  41
  42         provider := providers.NewIncomingRequestHandlerProvider(logger, config, rNibWriterProvider, rNibReaderProvider)
  43         return &Controller{
  44                 logger: logger,
  45                 handlerProvider: provider,
  46                 rmrResponseChannel: rmrResponseChannel,
  47         }
  48 }
  49
  50 func (c *Controller)ShutdownHandler(writer http.ResponseWriter, r *http.Request, params httprouter.Params){
  51
  52         c.handleRequest(writer, &r.Header, providers.ShutdownRequest,nil, false, http.StatusNoContent)
  53 }
  54
  55 //TODO create struct to input parameters
  56 func (c *Controller) handleRequest(writer http.ResponseWriter, header *http.Header, requestName providers.IncomingRequest,
  57         request *models.Request, validateHeader bool, httpStatusResponse int) {
  58
  59         c.logger.Infof("[Client -> E2 Manager] #controller.handleRequest - request: %v", requestName) //TODO print request if exist
  60
  61         if validateHeader {
  62
  63                 err := c.validateRequestHeader(header)
  64                 if err != nil {
  65                         c.handleErrorResponse(err, writer)
  66                         return
  67                 }
  68         }
  69
  70         handler,err := c.handlerProvider.GetHandler(requestName)
  71         if err != nil {
  72                 c.handleErrorResponse(err, writer)
  73                 return
  74         }
  75
  76         err = handler.Handle(c.logger, request, c.rmrResponseChannel)
  77
  78         if err != nil {
  79                 c.handleErrorResponse(err, writer)
  80                 return
  81         }
  82
  83         writer.WriteHeader(httpStatusResponse)
  84         c.logger.Infof("[E2 Manager -> Client] #controller.handleRequest - status response: %v", httpStatusResponse)
  85 }
  86
  87 func (c *Controller) validateRequestHeader( header *http.Header) error {
  88
  89         if header.Get("Content-Type") != "application/json"{
  90                 c.logger.Errorf("#controller.validateRequestHeader - validation failure, incorrect content type")
  91
  92                 return  e2managererrors.NewHeaderValidationError()
  93         }
  94         return nil
  95 }
  96
  97 func (c *Controller) handleErrorResponse(err error, writer http.ResponseWriter){
  98
  99         var errorResponseDetails models.ErrorResponse
 100         var httpError int
 101
 102         if err != nil {
 103                 switch err.(type) {
 104                 case *e2managererrors.RnibDbError:
 105                         e2Error, _ := err.(*e2managererrors.RnibDbError)
 106                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Err.Code, Message: e2Error.Err.Message}
 107                         httpError = http.StatusInternalServerError
 108                 case *e2managererrors.CommandAlreadyInProgressError:
 109                         e2Error, _ := err.(*e2managererrors.CommandAlreadyInProgressError)
 110                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Err.Code, Message: e2Error.Err.Message}
 111                         httpError = http.StatusMethodNotAllowed
 112                 case *e2managererrors.HeaderValidationError:
 113                         e2Error, _ := err.(*e2managererrors.HeaderValidationError)
 114                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Err.Code, Message: e2Error.Err.Message}
 115                         httpError = http.StatusUnsupportedMediaType
 116                 default:
 117                         e2Error, _ := err.(*e2managererrors.InternalError)
 118                         errorResponseDetails = models.ErrorResponse{Code: e2Error.Err.Code, Message: e2Error.Err.Message}
 119                         httpError = http.StatusInternalServerError
 120                 }
 121         }
 122         errorResponse, _ := json.Marshal(errorResponseDetails)
 123
 124         c.logger.Errorf("[E2 Manager -> Client] #controller.handleErrorResponse - http status: %d, error response: %+v", httpError, errorResponseDetails)
 125
 126         writer.Header().Set("Content-Type", "application/json")
 127         writer.WriteHeader(httpError)
 128         _, err = writer.Write(errorResponse)
 129
 130         if err != nil {
 131                 c.logger.Errorf("#controller.handleErrorResponse - Cannot send response. writer:%v", writer)
 132         }
 133 }