//
// Copyright 2019 AT&T Intellectual Property
// Copyright 2019 Nokia
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// This source code is part of the near-RT RIC (RAN Intelligent Controller)
// platform project (RICP).
package rmrmsghandlers
import (
"bytes"
"e2mgr/configuration"
"e2mgr/logger"
"e2mgr/managers"
"e2mgr/models"
"e2mgr/rmrCgo"
"e2mgr/services"
"e2mgr/services/rmrsender"
"e2mgr/utils"
"encoding/xml"
"errors"
"fmt"
"gerrit.o-ran-sc.org/r/ric-plt/nodeb-rnib.git/common"
"gerrit.o-ran-sc.org/r/ric-plt/nodeb-rnib.git/entities"
"strconv"
"strings"
)
type E2SetupRequestNotificationHandler struct {
logger *logger.Logger
config *configuration.Configuration
e2tInstancesManager managers.IE2TInstancesManager
rmrSender *rmrsender.RmrSender
rNibDataService services.RNibDataService
e2tAssociationManager *managers.E2TAssociationManager
}
func NewE2SetupRequestNotificationHandler(logger *logger.Logger, config *configuration.Configuration, e2tInstancesManager managers.IE2TInstancesManager, rmrSender *rmrsender.RmrSender, rNibDataService services.RNibDataService, e2tAssociationManager *managers.E2TAssociationManager) E2SetupRequestNotificationHandler {
return E2SetupRequestNotificationHandler{
logger: logger,
config: config,
e2tInstancesManager: e2tInstancesManager,
rmrSender: rmrSender,
rNibDataService: rNibDataService,
e2tAssociationManager: e2tAssociationManager,
}
}
func (h E2SetupRequestNotificationHandler) Handle(request *models.NotificationRequest){
ranName := request.RanName
h.logger.Infof("#E2SetupRequestNotificationHandler.Handle - RAN name: %s - received E2_SETUP_REQUEST. Payload: %x", ranName, request.Payload)
setupRequest, e2tIpAddress, err := h.parseSetupRequest(request.Payload)
if err != nil {
h.logger.Errorf(err.Error())
return
}
h.logger.Infof("#E2SetupRequestNotificationHandler.Handle - E2T Address: %s - handling E2_SETUP_REQUEST", e2tIpAddress)
h.logger.Debugf("#E2SetupRequestNotificationHandler.Handle - E2_SETUP_REQUEST has been parsed successfully %+v", setupRequest)
_, err = h.e2tInstancesManager.GetE2TInstance(e2tIpAddress)
if err != nil {
h.logger.Errorf("#E2TermInitNotificationHandler.Handle - Failed retrieving E2TInstance. error: %s", err)
return
}
nodebInfo, err := h.rNibDataService.GetNodeb(ranName)
if err != nil{
if _, ok := err.(*common.ResourceNotFoundError); ok{
nbIdentity := h.buildNbIdentity(ranName, setupRequest)
nodebInfo, err = h.buildNodebInfo(ranName, e2tIpAddress, setupRequest)
if err != nil{
h.logger.Errorf("#E2SetupRequestNotificationHandler.Handle - RAN name: %s - failed to build nodebInfo entity. Error: %s", ranName, err)
return
}
err = h.rNibDataService.SaveNodeb(nbIdentity, nodebInfo)
if err != nil{
h.logger.Errorf("#E2SetupRequestNotificationHandler.Handle - RAN name: %s - failed to save nodebInfo entity. Error: %s", ranName, err)
return
}
} else{
h.logger.Errorf("#E2SetupRequestNotificationHandler.Handle - RAN name: %s - failed to retrieve nodebInfo entity. Error: %s", ranName, err)
return
}
} else {
if nodebInfo.ConnectionStatus == entities.ConnectionStatus_SHUTTING_DOWN {
h.logger.Errorf("#E2SetupRequestNotificationHandler.Handle - RAN name: %s, connection status: %s - nodeB entity in incorrect state", nodebInfo.RanName, nodebInfo.ConnectionStatus)
h.logger.Infof("#E2SetupRequestNotificationHandler.Handle - Summary: elapsed time for receiving and handling setup request message from E2 terminator: %f ms", utils.ElapsedTime(request.StartTime))
return
}
nodebInfo.GetGnb().RanFunctions, err = setupRequest.GetExtractRanFunctionsList()
if err != nil{
h.logger.Errorf("#E2SetupRequestNotificationHandler.Handle - RAN name: %s - failed to update nodebInfo entity. Error: %s", ranName, err)
return
}
}
nodebInfo.ConnectionStatus = entities.ConnectionStatus_CONNECTED
err = h.e2tAssociationManager.AssociateRan(e2tIpAddress, nodebInfo)
if err != nil{
h.logger.Errorf("#E2SetupRequestNotificationHandler.Handle - RAN name: %s - failed to associate E2T to nodeB entity. Error: %s", ranName, err)
return
}
ricNearRtId, err := convertTo20BitString(h.config.GlobalRicId.RicNearRtId)
if err != nil{
h.logger.Errorf("#E2SetupRequestNotificationHandler.Handle - RAN name: %s - failed to convert RicNearRtId value %s to 20 bit string . Error: %s", ranName, h.config.GlobalRicId.RicNearRtId, err)
return
}
successResponse := models.NewE2SetupSuccessResponseMessage(h.config.GlobalRicId.PlmnId, ricNearRtId,setupRequest)
h.logger.Debugf("#E2SetupRequestNotificationHandler.Handle - E2_SETUP_RESPONSE has been built successfully %+v", successResponse)
responsePayload, err := xml.Marshal(&successResponse.E2APPDU)
if err != nil{
h.logger.Warnf("#E2SetupRequestNotificationHandler.Handle - RAN name: %s - Error marshalling RIC_E2_SETUP_RESP. Payload: %s", ranName, responsePayload)
}
responsePayload = replaceCriticalityTagsWithSelfClosing(responsePayload)
msg := models.NewRmrMessage(rmrCgo.RIC_E2_SETUP_RESP, ranName, responsePayload, request.TransactionId)
h.logger.Infof("#E2SetupRequestNotificationHandler.Handle - RAN name: %s - RIC_E2_SETUP_RESP message has been built successfully. Message: %x", ranName, msg)
_ = h.rmrSender.Send(msg)
}
func replaceCriticalityTagsWithSelfClosing(responsePayload []byte) []byte {
responseString := strings.Replace(string(responsePayload), "", "", -1)
responseString = strings.Replace(responseString, "", "", -1)
return []byte(responseString)
}
func convertTo20BitString(ricNearRtId string) (string, error){
r, err := strconv.ParseUint(ricNearRtId, 16, 32)
if err != nil{
return "", err
}
return fmt.Sprintf("%020b", r)[:20], nil
}
func (h E2SetupRequestNotificationHandler) parseSetupRequest(payload []byte)(*models.E2SetupRequestMessage, string, error){
pipInd := bytes.IndexByte(payload, '|')
if pipInd < 0 {
return nil, "", errors.New( "#E2SetupRequestNotificationHandler.parseSetupRequest - Error parsing E2 Setup Request failed extract Payload: no | separator found")
}
e2tIpAddress := string(payload[:pipInd])
if len(e2tIpAddress) == 0 {
return nil, "", errors.New("#E2SetupRequestNotificationHandler.parseSetupRequest - Empty E2T Address received")
}
setupRequest := &models.E2SetupRequestMessage{}
err := xml.Unmarshal(payload[pipInd + 1:], &setupRequest.E2APPDU)
if err != nil {
return nil, "", errors.New(fmt.Sprintf("#E2SetupRequestNotificationHandler.parseSetupRequest - Error unmarshalling E2 Setup Request payload: %x", payload))
}
return setupRequest, e2tIpAddress, nil
}
func (h E2SetupRequestNotificationHandler) buildNodebInfo(ranName string, e2tAddress string, request *models.E2SetupRequestMessage) (*entities.NodebInfo, error){
var err error
nodebInfo := &entities.NodebInfo{
AssociatedE2TInstanceAddress: e2tAddress,
ConnectionStatus: entities.ConnectionStatus_CONNECTED,
RanName: ranName,
NodeType: entities.Node_GNB,
Configuration: &entities.NodebInfo_Gnb{Gnb: &entities.Gnb{}},
GlobalNbId: &entities.GlobalNbId{
PlmnId: request.GetPlmnId(),
NbId: request.GetNbId(),
},
}
nodebInfo.GetGnb().RanFunctions, err = request.GetExtractRanFunctionsList()
return nodebInfo, err
}
func (h E2SetupRequestNotificationHandler) buildNbIdentity(ranName string, setupRequest *models.E2SetupRequestMessage)*entities.NbIdentity{
return &entities.NbIdentity{
InventoryName:ranName,
GlobalNbId: &entities.GlobalNbId{
PlmnId: setupRequest.GetPlmnId(),
NbId: setupRequest.GetNbId(),
},
}
}