E2Manager/handlers/rmrmsghandlers/e2_setup_request_notification_handler.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 package rmrmsghandlers
  21
  22 import (
  23         "bytes"
  24         "e2mgr/configuration"
  25         "e2mgr/e2managererrors"
  26         "e2mgr/logger"
  27         "e2mgr/managers"
  28         "e2mgr/models"
  29         "e2mgr/rmrCgo"
  30         "e2mgr/services"
  31         "e2mgr/services/rmrsender"
  32         "encoding/xml"
  33         "errors"
  34         "fmt"
  35         "gerrit.o-ran-sc.org/r/ric-plt/nodeb-rnib.git/common"
  36         "gerrit.o-ran-sc.org/r/ric-plt/nodeb-rnib.git/entities"
  37         "strconv"
  38         "strings"
  39 )
  40
  41 var (
  42         emptyTagsToReplaceToSelfClosingTags = []string{"reject", "ignore", "transport-resource-unavailable", "om-intervention",
  43                 "v60s", "v20s", "v10s", "v5s", "v2s", "v1s"}
  44 )
  45
  46 type E2SetupRequestNotificationHandler struct {
  47         logger                        *logger.Logger
  48         config                        *configuration.Configuration
  49         e2tInstancesManager           managers.IE2TInstancesManager
  50         rmrSender                     *rmrsender.RmrSender
  51         rNibDataService               services.RNibDataService
  52         e2tAssociationManager         *managers.E2TAssociationManager
  53         ranConnectStatusChangeManager managers.IRanConnectStatusChangeManager
  54 }
  55
  56 func NewE2SetupRequestNotificationHandler(logger *logger.Logger, config *configuration.Configuration, e2tInstancesManager managers.IE2TInstancesManager, rmrSender *rmrsender.RmrSender, rNibDataService services.RNibDataService, e2tAssociationManager *managers.E2TAssociationManager, ranConnectStatusChangeManager managers.IRanConnectStatusChangeManager) *E2SetupRequestNotificationHandler {
  57         return &E2SetupRequestNotificationHandler{
  58                 logger:                        logger,
  59                 config:                        config,
  60                 e2tInstancesManager:           e2tInstancesManager,
  61                 rmrSender:                     rmrSender,
  62                 rNibDataService:               rNibDataService,
  63                 e2tAssociationManager:         e2tAssociationManager,
  64                 ranConnectStatusChangeManager: ranConnectStatusChangeManager,
  65         }
  66 }
  67
  68 func (h *E2SetupRequestNotificationHandler) Handle(request *models.NotificationRequest) {
  69         ranName := request.RanName
  70         h.logger.Infof("#E2SetupRequestNotificationHandler.Handle - RAN name: %s - received E2_SETUP_REQUEST. Payload: %x", ranName, request.Payload)
  71
  72         generalConfiguration, err := h.rNibDataService.GetGeneralConfiguration()
  73
  74         if err != nil {
  75                 h.logger.Errorf("#E2SetupRequestNotificationHandler.Handle - Failed retrieving e2m general configuration - quitting e2 setup flow. error: %s", err)
  76                 return
  77         }
  78
  79         h.logger.Infof("#E2SetupRequestNotificationHandler.Handle - got general configuration from rnib - enableRic: %t", generalConfiguration.EnableRic)
  80
  81         if !generalConfiguration.EnableRic {
  82                 cause := models.Cause{Misc: &models.CauseMisc{OmIntervention: &struct{}{}}}
  83                 h.handleUnsuccessfulResponse(ranName, request, cause)
  84                 return
  85         }
  86
  87         setupRequest, e2tIpAddress, err := h.parseSetupRequest(request.Payload)
  88         if err != nil {
  89                 h.logger.Errorf(err.Error())
  90                 return
  91         }
  92
  93         h.logger.Infof("#E2SetupRequestNotificationHandler.Handle - E2T Address: %s - handling E2_SETUP_REQUEST", e2tIpAddress)
  94         h.logger.Debugf("#E2SetupRequestNotificationHandler.Handle - E2_SETUP_REQUEST has been parsed successfully %+v", setupRequest)
  95
  96         _, err = h.e2tInstancesManager.GetE2TInstance(e2tIpAddress)
  97
  98         if err != nil {
  99                 h.logger.Errorf("#E2TermInitNotificationHandler.Handle - Failed retrieving E2TInstance. error: %s", err)
 100                 return
 101         }
 102
 103         nodebInfo, err := h.rNibDataService.GetNodeb(ranName)
 104
 105         if err != nil {
 106
 107                 if _, ok := err.(*common.ResourceNotFoundError); !ok {
 108                         h.logger.Errorf("#E2SetupRequestNotificationHandler.Handle - RAN name: %s - failed to retrieve nodebInfo entity. Error: %s", ranName, err)
 109                         return
 110
 111                 }
 112
 113                 if nodebInfo, err = h.handleNewRan(ranName, e2tIpAddress, setupRequest); err != nil {
 114                         return
 115                 }
 116
 117         } else {
 118                 if err = h.handleExistingRan(ranName, nodebInfo, setupRequest); err != nil {
 119                         return
 120                 }
 121         }
 122
 123         err = h.e2tAssociationManager.AssociateRan(e2tIpAddress, nodebInfo)
 124
 125         if err != nil {
 126
 127                 h.logger.Errorf("#E2SetupRequestNotificationHandler.Handle - RAN name: %s - failed to associate E2T to nodeB entity. Error: %s", ranName, err)
 128                 if _, ok := err.(*e2managererrors.RoutingManagerError); ok {
 129                         cause := models.Cause{Transport: &models.CauseTransport{TransportResourceUnavailable: &struct{}{}}}
 130                         h.handleUnsuccessfulResponse(nodebInfo.RanName, request, cause)
 131                 }
 132                 return
 133         }
 134
 135         h.handleSuccessfulResponse(ranName, request, setupRequest)
 136 }
 137
 138 func (h *E2SetupRequestNotificationHandler) handleNewRan(ranName string, e2tIpAddress string, setupRequest *models.E2SetupRequestMessage) (*entities.NodebInfo, error) {
 139
 140         nodebInfo, err := h.buildNodebInfo(ranName, e2tIpAddress, setupRequest)
 141
 142         if err != nil {
 143                 h.logger.Errorf("#E2SetupRequestNotificationHandler.handleNewRan - RAN name: %s - failed to build nodebInfo entity. Error: %s", ranName, err)
 144                 return nil, err
 145         }
 146
 147         nbIdentity := h.buildNbIdentity(ranName, setupRequest)
 148         err = h.rNibDataService.SaveNodeb(nbIdentity, nodebInfo)
 149
 150         if err != nil {
 151                 h.logger.Errorf("#E2SetupRequestNotificationHandler.handleNewRan - RAN name: %s - failed to save nodebInfo entity. Error: %s", ranName, err)
 152                 return nil, err
 153         }
 154
 155         return nodebInfo, nil
 156 }
 157
 158 func (h *E2SetupRequestNotificationHandler) setGnbFunctions(nodebInfo *entities.NodebInfo, setupRequest *models.E2SetupRequestMessage) {
 159         ranFunctions := setupRequest.ExtractRanFunctionsList()
 160
 161         if ranFunctions != nil {
 162                 nodebInfo.GetGnb().RanFunctions = ranFunctions
 163         }
 164 }
 165
 166 func (h *E2SetupRequestNotificationHandler) handleExistingRan(ranName string, nodebInfo *entities.NodebInfo, setupRequest *models.E2SetupRequestMessage) error {
 167         if nodebInfo.GetConnectionStatus() == entities.ConnectionStatus_SHUTTING_DOWN {
 168                 h.logger.Errorf("#E2SetupRequestNotificationHandler.Handle - RAN name: %s, connection status: %s - nodeB entity in incorrect state", ranName, nodebInfo.ConnectionStatus)
 169                 return errors.New("nodeB entity in incorrect state")
 170         }
 171
 172         h.setGnbFunctions(nodebInfo, setupRequest)
 173
 174         return h.rNibDataService.UpdateNodebInfo(nodebInfo)
 175 }
 176
 177 func (h *E2SetupRequestNotificationHandler) handleUnsuccessfulResponse(ranName string, req *models.NotificationRequest, cause models.Cause) {
 178         failureResponse := models.NewE2SetupFailureResponseMessage(models.TimeToWaitEnum.V60s, cause)
 179         h.logger.Debugf("#E2SetupRequestNotificationHandler.handleUnsuccessfulResponse - E2_SETUP_RESPONSE has been built successfully %+v", failureResponse)
 180
 181         responsePayload, err := xml.Marshal(&failureResponse.E2APPDU)
 182         if err != nil {
 183                 h.logger.Warnf("#E2SetupRequestNotificationHandler.handleUnsuccessfulResponse - RAN name: %s - Error marshalling RIC_E2_SETUP_RESP. Payload: %s", ranName, responsePayload)
 184         }
 185
 186         responsePayload = replaceEmptyTagsWithSelfClosing(responsePayload)
 187
 188         h.logger.Infof("#E2SetupRequestNotificationHandler.handleUnsuccessfulResponse - payload: %s", responsePayload)
 189         msg := models.NewRmrMessage(rmrCgo.RIC_E2_SETUP_FAILURE, ranName, responsePayload, req.TransactionId, req.GetMsgSrc())
 190         h.logger.Infof("#E2SetupRequestNotificationHandler.handleUnsuccessfulResponse - RAN name: %s - RIC_E2_SETUP_RESP message has been built successfully. Message: %x", ranName, msg)
 191         _ = h.rmrSender.WhSend(msg)
 192
 193 }
 194
 195 func (h *E2SetupRequestNotificationHandler) handleSuccessfulResponse(ranName string, req *models.NotificationRequest, setupRequest *models.E2SetupRequestMessage) {
 196
 197         plmnId := buildPlmnId(h.config.GlobalRicId.Mcc, h.config.GlobalRicId.Mnc)
 198
 199         ricNearRtId, err := convertTo20BitString(h.config.GlobalRicId.RicId)
 200         if err != nil {
 201                 return
 202         }
 203         successResponse := models.NewE2SetupSuccessResponseMessage(plmnId, ricNearRtId, setupRequest)
 204         h.logger.Debugf("#E2SetupRequestNotificationHandler.handleSuccessfulResponse - E2_SETUP_RESPONSE has been built successfully %+v", successResponse)
 205
 206         responsePayload, err := xml.Marshal(&successResponse.E2APPDU)
 207         if err != nil {
 208                 h.logger.Warnf("#E2SetupRequestNotificationHandler.handleSuccessfulResponse - RAN name: %s - Error marshalling RIC_E2_SETUP_RESP. Payload: %s", ranName, responsePayload)
 209         }
 210
 211         responsePayload = replaceEmptyTagsWithSelfClosing(responsePayload)
 212
 213         h.logger.Infof("#E2SetupRequestNotificationHandler.handleSuccessfulResponse - payload: %s", responsePayload)
 214
 215         msg := models.NewRmrMessage(rmrCgo.RIC_E2_SETUP_RESP, ranName, responsePayload, req.TransactionId, req.GetMsgSrc())
 216         h.logger.Infof("#E2SetupRequestNotificationHandler.handleSuccessfulResponse - RAN name: %s - RIC_E2_SETUP_RESP message has been built successfully. Message: %x", ranName, msg)
 217         _ = h.rmrSender.Send(msg)
 218 }
 219
 220 func buildPlmnId(mmc string, mnc string) string {
 221         var b strings.Builder
 222
 223         b.WriteByte(mmc[1])
 224         b.WriteByte(mmc[0])
 225         if len(mnc) == 2 {
 226                 b.WriteString("F")
 227         } else {
 228                 b.WriteByte(mnc[2])
 229         }
 230         b.WriteByte(mmc[2])
 231         b.WriteByte(mnc[1])
 232         b.WriteByte(mnc[0])
 233
 234         return b.String()
 235 }
 236
 237 func replaceEmptyTagsWithSelfClosing(responsePayload []byte) []byte {
 238
 239         emptyTagVsSelfClosingTagPairs := make([]string, len(emptyTagsToReplaceToSelfClosingTags)*2)
 240
 241         j := 0
 242
 243         for i := 0; i < len(emptyTagsToReplaceToSelfClosingTags); i++ {
 244                 emptyTagVsSelfClosingTagPairs[j] = fmt.Sprintf("<%[1]s></%[1]s>", emptyTagsToReplaceToSelfClosingTags[i])
 245                 emptyTagVsSelfClosingTagPairs[j+1] = fmt.Sprintf("<%s/>", emptyTagsToReplaceToSelfClosingTags[i])
 246                 j += 2
 247         }
 248         responseString := strings.NewReplacer(emptyTagVsSelfClosingTagPairs...).Replace(string(responsePayload))
 249         return []byte(responseString)
 250 }
 251
 252 func convertTo20BitString(ricNearRtId string) (string, error) {
 253         r, err := strconv.ParseUint(ricNearRtId, 16, 32)
 254         if err != nil {
 255                 return "", err
 256         }
 257         return fmt.Sprintf("%020b", r)[:20], nil
 258 }
 259
 260 func (h *E2SetupRequestNotificationHandler) parseSetupRequest(payload []byte) (*models.E2SetupRequestMessage, string, error) {
 261
 262         pipInd := bytes.IndexByte(payload, '|')
 263         if pipInd < 0 {
 264                 return nil, "", errors.New("#E2SetupRequestNotificationHandler.parseSetupRequest - Error parsing E2 Setup Request failed extract Payload: no | separator found")
 265         }
 266
 267         e2tIpAddress := string(payload[:pipInd])
 268         if len(e2tIpAddress) == 0 {
 269                 return nil, "", errors.New("#E2SetupRequestNotificationHandler.parseSetupRequest - Empty E2T Address received")
 270         }
 271
 272         h.logger.Infof("#E2SetupRequestNotificationHandler.parseSetupRequest - payload: %s", payload[pipInd+1:])
 273
 274         setupRequest := &models.E2SetupRequestMessage{}
 275         err := xml.Unmarshal(normalizeXml(payload[pipInd+1:]), &setupRequest.E2APPDU)
 276         if err != nil {
 277                 return nil, "", errors.New(fmt.Sprintf("#E2SetupRequestNotificationHandler.parseSetupRequest - Error unmarshalling E2 Setup Request payload: %x", payload))
 278         }
 279
 280         return setupRequest, e2tIpAddress, nil
 281 }
 282
 283 func normalizeXml(payload []byte) []byte {
 284         xmlStr := string(payload)
 285         normalized := strings.NewReplacer("&lt;", "<", "&gt;", ">").Replace(xmlStr)
 286         return []byte(normalized)
 287 }
 288
 289 func (h *E2SetupRequestNotificationHandler) buildNodebInfo(ranName string, e2tAddress string, request *models.E2SetupRequestMessage) (*entities.NodebInfo, error) {
 290
 291         var err error
 292         nodebInfo := &entities.NodebInfo{
 293                 AssociatedE2TInstanceAddress: e2tAddress,
 294                 RanName:                      ranName,
 295                 NodeType:                     entities.Node_GNB,
 296                 Configuration:                &entities.NodebInfo_Gnb{Gnb: &entities.Gnb{}},
 297                 GlobalNbId:                   h.buildGlobalNbId(request),
 298         }
 299
 300         h.setGnbFunctions(nodebInfo, request)
 301         return nodebInfo, err
 302 }
 303
 304 func (h *E2SetupRequestNotificationHandler) buildGlobalNbId(setupRequest *models.E2SetupRequestMessage) *entities.GlobalNbId {
 305         return &entities.GlobalNbId{
 306                 PlmnId: setupRequest.GetPlmnId(),
 307                 NbId:   setupRequest.GetNbId(),
 308         }
 309 }
 310
 311 func (h *E2SetupRequestNotificationHandler) buildNbIdentity(ranName string, setupRequest *models.E2SetupRequestMessage) *entities.NbIdentity {
 312         return &entities.NbIdentity{
 313                 InventoryName: ranName,
 314                 GlobalNbId:    h.buildGlobalNbId(setupRequest),
 315         }
 316 }