pkg/control/control.go

/*
==================================================================================
  Copyright (c) 2019 AT&T Intellectual Property.
  Copyright (c) 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.
==================================================================================
*/

package control

import (
	"fmt"
	"net/http"
	"os"
	"strconv"
	"strings"
	"time"

	"gerrit.o-ran-sc.org/r/ric-plt/e2ap/pkg/e2ap"
	rtmgrclient "gerrit.o-ran-sc.org/r/ric-plt/submgr/pkg/rtmgr_client"
	"gerrit.o-ran-sc.org/r/ric-plt/xapp-frame/pkg/models"
	"gerrit.o-ran-sc.org/r/ric-plt/xapp-frame/pkg/restapi/operations/common"
	"gerrit.o-ran-sc.org/r/ric-plt/xapp-frame/pkg/xapp"
	httptransport "github.com/go-openapi/runtime/client"
	"github.com/go-openapi/strfmt"
	"github.com/gorilla/mux"
	"github.com/segmentio/ksuid"
	"github.com/spf13/viper"
)

//-----------------------------------------------------------------------------
//
//-----------------------------------------------------------------------------

func idstring(err error, entries ...fmt.Stringer) string {
	var retval string = ""
	var filler string = ""
	for _, entry := range entries {
		if entry != nil {
			retval += filler + entry.String()
			filler = " "
		} else {
			retval += filler + "(NIL)"
		}
	}
	if err != nil {
		retval += filler + "err(" + err.Error() + ")"
		filler = " "
	}
	return retval
}

//-----------------------------------------------------------------------------
//
//-----------------------------------------------------------------------------

var e2tSubReqTimeout time.Duration
var e2tSubDelReqTime time.Duration
var e2tRecvMsgTimeout time.Duration
var waitRouteCleanup_ms time.Duration
var e2tMaxSubReqTryCount uint64    // Initial try + retry
var e2tMaxSubDelReqTryCount uint64 // Initial try + retry
var readSubsFromDb string
var restDuplicateCtrl duplicateCtrl
var dbRetryForever string
var dbTryCount int

type Control struct {
	*xapp.RMRClient
	e2ap          *E2ap
	registry      *Registry
	tracker       *Tracker
	e2SubsDb      Sdlnterface
	restSubsDb    Sdlnterface
	CntRecvMsg    uint64
	ResetTestFlag bool
	Counters      map[string]xapp.Counter
	LoggerLevel   int
}

type RMRMeid struct {
	PlmnID  string
	EnbID   string
	RanName string
}

type SubmgrRestartTestEvent struct{}
type SubmgrRestartUpEvent struct{}
type PackSubscriptionRequestErrortEvent struct {
	ErrorInfo ErrorInfo
}

func (p *PackSubscriptionRequestErrortEvent) SetEvent(errorInfo *ErrorInfo) {
	p.ErrorInfo = *errorInfo
}

type SDLWriteErrortEvent struct {
	ErrorInfo ErrorInfo
}

func (s *SDLWriteErrortEvent) SetEvent(errorInfo *ErrorInfo) {
	s.ErrorInfo = *errorInfo
}

func init() {
	xapp.Logger.Debug("SUBMGR")
	viper.AutomaticEnv()
	viper.SetEnvPrefix("submgr")
	viper.AllowEmptyEnv(true)
}

func NewControl() *Control {

	transport := httptransport.New(viper.GetString("rtmgr.HostAddr")+":"+viper.GetString("rtmgr.port"), viper.GetString("rtmgr.baseUrl"), []string{"http"})
	rtmgrClient := RtmgrClient{rtClient: rtmgrclient.New(transport, strfmt.Default)}

	registry := new(Registry)
	registry.Initialize()
	registry.rtmgrClient = &rtmgrClient

	tracker := new(Tracker)
	tracker.Init()

	c := &Control{e2ap: new(E2ap),
		registry:    registry,
		tracker:     tracker,
		e2SubsDb:    CreateSdl(),
		restSubsDb:  CreateRESTSdl(),
		Counters:    xapp.Metric.RegisterCounterGroup(GetMetricsOpts(), "SUBMGR"),
		LoggerLevel: 3,
	}
	c.ReadConfigParameters("")

	// Register REST handler for testing support
	xapp.Resource.InjectRoute("/ric/v1/test/{testId}", c.TestRestHandler, "POST")
	xapp.Resource.InjectRoute("/ric/v1/restsubscriptions", c.GetAllRestSubscriptions, "GET")
	xapp.Resource.InjectRoute("/ric/v1/symptomdata", c.SymptomDataHandler, "GET")

	go xapp.Subscription.Listen(c.RESTSubscriptionHandler, c.RESTQueryHandler, c.RESTSubscriptionDeleteHandler)

	if readSubsFromDb == "false" {
		return c
	}

	restDuplicateCtrl.Init()

	// Read subscriptions from db
	c.ReadE2Subscriptions()
	c.ReadRESTSubscriptions()
	return c
}

func (c *Control) SymptomDataHandler(w http.ResponseWriter, r *http.Request) {
	subscriptions, _ := c.registry.QueryHandler()
	xapp.Resource.SendSymptomDataJson(w, r, subscriptions, "platform/subscriptions.json")
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func (c *Control) GetAllRestSubscriptions(w http.ResponseWriter, r *http.Request) {
	xapp.Logger.Debug("GetAllRestSubscriptions() called")
	response := c.registry.GetAllRestSubscriptions()
	w.Write(response)
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func (c *Control) ReadE2Subscriptions() error {
	var err error
	var subIds []uint32
	var register map[uint32]*Subscription
	for i := 0; dbRetryForever == "true" || i < dbTryCount; i++ {
		xapp.Logger.Debug("Reading E2 subscriptions from db")
		subIds, register, err = c.ReadAllSubscriptionsFromSdl()
		if err != nil {
			xapp.Logger.Error("%v", err)
			<-time.After(1 * time.Second)
		} else {
			c.registry.subIds = subIds
			c.registry.register = register
			c.HandleUncompletedSubscriptions(register)
			return nil
		}
	}
	xapp.Logger.Debug("Continuing without retring")
	return err
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func (c *Control) ReadRESTSubscriptions() error {
	var err error
	var restSubscriptions map[string]*RESTSubscription
	for i := 0; dbRetryForever == "true" || i < dbTryCount; i++ {
		xapp.Logger.Debug("Reading REST subscriptions from db")
		restSubscriptions, err = c.ReadAllRESTSubscriptionsFromSdl()
		if err != nil {
			xapp.Logger.Error("%v", err)
			<-time.After(1 * time.Second)
		} else {
			c.registry.restSubscriptions = restSubscriptions
			return nil
		}
	}
	xapp.Logger.Debug("Continuing without retring")
	return err
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func (c *Control) ReadConfigParameters(f string) {

	c.LoggerLevel = int(xapp.Logger.GetLevel())
	xapp.Logger.Debug("LoggerLevel %v", c.LoggerLevel)

	// viper.GetDuration returns nanoseconds
	e2tSubReqTimeout = viper.GetDuration("controls.e2tSubReqTimeout_ms") * 1000000
	if e2tSubReqTimeout == 0 {
		e2tSubReqTimeout = 2000 * 1000000
	}
	xapp.Logger.Debug("e2tSubReqTimeout %v", e2tSubReqTimeout)

	e2tSubDelReqTime = viper.GetDuration("controls.e2tSubDelReqTime_ms") * 1000000
	if e2tSubDelReqTime == 0 {
		e2tSubDelReqTime = 2000 * 1000000
	}
	xapp.Logger.Debug("e2tSubDelReqTime %v", e2tSubDelReqTime)
	e2tRecvMsgTimeout = viper.GetDuration("controls.e2tRecvMsgTimeout_ms") * 1000000
	if e2tRecvMsgTimeout == 0 {
		e2tRecvMsgTimeout = 2000 * 1000000
	}
	xapp.Logger.Debug("e2tRecvMsgTimeout %v", e2tRecvMsgTimeout)

	e2tMaxSubReqTryCount = viper.GetUint64("controls.e2tMaxSubReqTryCount")
	if e2tMaxSubReqTryCount == 0 {
		e2tMaxSubReqTryCount = 1
	}
	xapp.Logger.Debug("e2tMaxSubReqTryCount %v", e2tMaxSubReqTryCount)

	e2tMaxSubDelReqTryCount = viper.GetUint64("controls.e2tMaxSubDelReqTryCount")
	if e2tMaxSubDelReqTryCount == 0 {
		e2tMaxSubDelReqTryCount = 1
	}
	xapp.Logger.Debug("e2tMaxSubDelReqTryCount %v", e2tMaxSubDelReqTryCount)

	readSubsFromDb = viper.GetString("controls.readSubsFromDb")
	if readSubsFromDb == "" {
		readSubsFromDb = "true"
	}
	xapp.Logger.Debug("readSubsFromDb %v", readSubsFromDb)

	dbTryCount = viper.GetInt("controls.dbTryCount")
	if dbTryCount == 0 {
		dbTryCount = 200
	}
	xapp.Logger.Debug("dbTryCount %v", dbTryCount)

	dbRetryForever = viper.GetString("controls.dbRetryForever")
	if dbRetryForever == "" {
		dbRetryForever = "true"
	}
	xapp.Logger.Debug("dbRetryForever %v", dbRetryForever)

	// Internal cfg parameter, used to define a wait time for RMR route clean-up. None default
	// value 100ms used currently only in unittests.
	waitRouteCleanup_ms = viper.GetDuration("controls.waitRouteCleanup_ms") * 1000000
	if waitRouteCleanup_ms == 0 {
		waitRouteCleanup_ms = 5000 * 1000000
	}
	xapp.Logger.Debug("waitRouteCleanup %v", waitRouteCleanup_ms)
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func (c *Control) HandleUncompletedSubscriptions(register map[uint32]*Subscription) {

	xapp.Logger.Debug("HandleUncompletedSubscriptions. len(register) = %v", len(register))
	for subId, subs := range register {
		if subs.SubRespRcvd == false {
			// If policy subscription has already been made successfully unsuccessful update should not be deleted.
			if subs.PolicyUpdate == false {
				subs.NoRespToXapp = true
				xapp.Logger.Debug("SendSubscriptionDeleteReq. subId = %v", subId)
				c.SendSubscriptionDeleteReq(subs)
			}
		}
	}
}

func (c *Control) ReadyCB(data interface{}) {
	if c.RMRClient == nil {
		c.RMRClient = xapp.Rmr
	}
}

func (c *Control) Run() {
	xapp.SetReadyCB(c.ReadyCB, nil)
	xapp.AddConfigChangeListener(c.ReadConfigParameters)
	xapp.Run(c)
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func (c *Control) GetOrCreateRestSubscription(p *models.SubscriptionParams, md5sum string, xAppRmrEndpoint string) (*RESTSubscription, string, string, error) {

	var restSubId string
	var restSubscription *RESTSubscription
	var err error

	prevRestSubsId, exists := restDuplicateCtrl.GetLastKnownRestSubsIdBasedOnMd5sum(md5sum)
	if p.SubscriptionID == "" {
		// Subscription does not contain REST subscription Id
		if exists {
			restSubscription, err = c.registry.GetRESTSubscription(prevRestSubsId, false)
			if restSubscription != nil {
				// Subscription not found
				restSubId = prevRestSubsId
				if err == nil {
					xapp.Logger.Debug("Existing restSubId %s found by MD5sum %s for a request without subscription ID - using previous subscription", prevRestSubsId, md5sum)
				} else {
					xapp.Logger.Debug("Existing restSubId %s found by MD5sum %s for a request without subscription ID - Note: %s", prevRestSubsId, md5sum, err.Error())
				}
			} else {
				xapp.Logger.Debug("None existing restSubId %s referred by MD5sum %s for a request without subscription ID - deleting cached entry", prevRestSubsId, md5sum)
				restDuplicateCtrl.DeleteLastKnownRestSubsIdBasedOnMd5sum(md5sum)
			}
		}

		if restSubscription == nil {
			restSubId = ksuid.New().String()
			restSubscription = c.registry.CreateRESTSubscription(&restSubId, &xAppRmrEndpoint, p.Meid)
		}
	} else {
		// Subscription contains REST subscription Id
		restSubId = p.SubscriptionID

		xapp.Logger.Debug("RestSubscription ID %s provided via REST request", restSubId)
		restSubscription, err = c.registry.GetRESTSubscription(restSubId, false)
		if err != nil {
			// Subscription with id in REST request does not exist
			xapp.Logger.Error("%s", err.Error())
			c.UpdateCounter(cRestSubFailToXapp)
			return nil, "", models.SubscriptionInstanceRejectCauseRESTSubscriptionWithGivenIDDoesNotExist, err
		}

		if !exists {
			xapp.Logger.Debug("Existing restSubscription found for ID %s, new request based on md5sum", restSubId)
		} else {
			xapp.Logger.Debug("Existing restSubscription found for ID %s(%s), re-transmission based on md5sum match with previous request", prevRestSubsId, restSubId)
		}
	}

	return restSubscription, restSubId, "", nil
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func (c *Control) RESTSubscriptionHandler(params interface{}) (*models.SubscriptionResponse, int) {

	c.CntRecvMsg++
	c.UpdateCounter(cRestSubReqFromXapp)

	subResp := models.SubscriptionResponse{}
	p := params.(*models.SubscriptionParams)

	if c.LoggerLevel > 2 {
		c.PrintRESTSubscriptionRequest(p)
	}

	if p.ClientEndpoint == nil {
		err := fmt.Errorf("ClientEndpoint == nil")
		xapp.Logger.Error("%v", err)
		c.UpdateCounter(cRestSubFailToXapp)
		return c.GetSubscriptionResponse(models.SubscriptionInstanceRejectCauseInvalidRESTRequestMessage, err.Error(), "SUBMGR", ""), common.SubscribeBadRequestCode
	}

	_, xAppRmrEndpoint, err := ConstructEndpointAddresses(*p.ClientEndpoint)
	if err != nil {
		xapp.Logger.Error("%s", err.Error())
		c.UpdateCounter(cRestSubFailToXapp)
		return c.GetSubscriptionResponse(models.SubscriptionInstanceRejectCauseInvalidRESTRequestMessage, err.Error(), "SUBMGR", ""), common.SubscribeBadRequestCode
	}

	md5sum, err := CalculateRequestMd5sum(params)
	if err != nil {
		xapp.Logger.Error("Failed to generate md5sum from incoming request - %s", err.Error())
	}

	restSubscription, restSubId, rejectCause, err := c.GetOrCreateRestSubscription(p, md5sum, xAppRmrEndpoint)
	if err != nil {
		xapp.Logger.Error("Failed to get/allocate REST subscription")
		return c.GetSubscriptionResponse(rejectCause, err.Error(), "SUBMGR", ""), common.SubscribeBadRequestCode
	}

	subResp.SubscriptionID = &restSubId
	subReqList := e2ap.SubscriptionRequestList{}
	err = c.e2ap.FillSubscriptionReqMsgs(params, &subReqList, restSubscription)
	if err != nil {
		xapp.Logger.Error("%s", err.Error())
		restDuplicateCtrl.DeleteLastKnownRestSubsIdBasedOnMd5sum(md5sum)
		c.registry.DeleteRESTSubscription(&restSubId)
		c.UpdateCounter(cRestSubFailToXapp)
		return c.GetSubscriptionResponse(models.SubscriptionInstanceRejectCauseInvalidRESTRequestMessage, err.Error(), "SUBMGR", ""), common.SubscribeBadRequestCode
	}

	duplicate := restDuplicateCtrl.IsDuplicateToOngoingTransaction(restSubId, md5sum)
	if duplicate {
		err := fmt.Errorf("Retransmission blocker direct ACK for request of restSubsId %s restSubId MD5sum %s as retransmission", restSubId, md5sum)
		xapp.Logger.Debug("%s", err)
		c.UpdateCounter(cRestSubRespToXapp)
		return &subResp, common.SubscribeCreatedCode
	}

	c.WriteRESTSubscriptionToDb(restSubId, restSubscription)
	e2SubscriptionDirectives, err := c.GetE2SubscriptionDirectives(p)
	if err != nil {
		xapp.Logger.Error("%s", err)
		return c.GetSubscriptionResponse(models.SubscriptionInstanceRejectCauseInvalidRESTRequestMessage, err.Error(), "SUBMGR", ""), common.SubscribeBadRequestCode
	}
	go c.processSubscriptionRequests(restSubscription, &subReqList, p.ClientEndpoint, p.Meid, &restSubId, xAppRmrEndpoint, md5sum, e2SubscriptionDirectives)

	c.UpdateCounter(cRestSubRespToXapp)
	return &subResp, common.SubscribeCreatedCode
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func (c *Control) GetE2SubscriptionDirectives(p *models.SubscriptionParams) (*E2SubscriptionDirectives, error) {

	e2SubscriptionDirectives := &E2SubscriptionDirectives{}
	if p == nil || p.E2SubscriptionDirectives == nil {
		e2SubscriptionDirectives.E2TimeoutTimerValue = e2tSubReqTimeout
		e2SubscriptionDirectives.E2MaxTryCount = int64(e2tMaxSubReqTryCount)
		e2SubscriptionDirectives.CreateRMRRoute = true
		xapp.Logger.Debug("p == nil || p.E2SubscriptionDirectives == nil. Using default values for E2TimeoutTimerValue = %v and E2RetryCount = %v RMRRoutingNeeded = true", e2tSubReqTimeout, e2tMaxSubReqTryCount)
	} else {
		if p.E2SubscriptionDirectives.E2TimeoutTimerValue >= 1 && p.E2SubscriptionDirectives.E2TimeoutTimerValue <= 10 {
			e2SubscriptionDirectives.E2TimeoutTimerValue = time.Duration(p.E2SubscriptionDirectives.E2TimeoutTimerValue) * 1000000000 // Duration type cast returns nano seconds
		} else {
			return nil, fmt.Errorf("p.E2SubscriptionDirectives.E2TimeoutTimerValue out of range (1-10 seconds): %v", p.E2SubscriptionDirectives.E2TimeoutTimerValue)
		}
		if p.E2SubscriptionDirectives.E2RetryCount == nil {
			xapp.Logger.Error("p.E2SubscriptionDirectives.E2RetryCount == nil. Using default value")
			e2SubscriptionDirectives.E2MaxTryCount = int64(e2tMaxSubReqTryCount)
		} else {
			if *p.E2SubscriptionDirectives.E2RetryCount >= 0 && *p.E2SubscriptionDirectives.E2RetryCount <= 10 {
				e2SubscriptionDirectives.E2MaxTryCount = *p.E2SubscriptionDirectives.E2RetryCount + 1 // E2MaxTryCount = First sending plus two retries
			} else {
				return nil, fmt.Errorf("p.E2SubscriptionDirectives.E2RetryCount out of range (0-10): %v", *p.E2SubscriptionDirectives.E2RetryCount)
			}
		}
		if p.E2SubscriptionDirectives.RMRRoutingNeeded == nil {
			xapp.Logger.Error("p.E2SubscriptionDirectives.RMRRoutingNeeded == nil")
			e2SubscriptionDirectives.CreateRMRRoute = true
		} else {
			e2SubscriptionDirectives.CreateRMRRoute = *p.E2SubscriptionDirectives.RMRRoutingNeeded
		}
	}
	xapp.Logger.Debug("e2SubscriptionDirectives.E2TimeoutTimerValue: %v", e2SubscriptionDirectives.E2TimeoutTimerValue)
	xapp.Logger.Debug("e2SubscriptionDirectives.E2MaxTryCount: %v", e2SubscriptionDirectives.E2MaxTryCount)
	xapp.Logger.Debug("e2SubscriptionDirectives.CreateRMRRoute: %v", e2SubscriptionDirectives.CreateRMRRoute)
	return e2SubscriptionDirectives, nil
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func (c *Control) GetSubscriptionResponse(rejectCause string, errorCause string, errorSource string, timeoutType string) *models.SubscriptionResponse {
	subResp := models.SubscriptionResponse{}
	subscriptionInstance := models.SubscriptionInstance{}
	subscriptionInstance.RejectCause = &rejectCause
	subscriptionInstance.ErrorCause = &errorCause
	subscriptionInstance.ErrorSource = &errorSource
	if timeoutType != "" {
		subscriptionInstance.TimeoutType = &timeoutType
	}
	subResp.SubscriptionInstances = append(subResp.SubscriptionInstances, &subscriptionInstance)
	xapp.Logger.Error("etSubscriptionResponse() %+v", subscriptionInstance)

	return &subResp
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------

func (c *Control) processSubscriptionRequests(restSubscription *RESTSubscription, subReqList *e2ap.SubscriptionRequestList,
	clientEndpoint *models.SubscriptionParamsClientEndpoint, meid *string, restSubId *string, xAppRmrEndpoint string, md5sum string, e2SubscriptionDirectives *E2SubscriptionDirectives) {

	xapp.Logger.Debug("Subscription Request count=%v ", len(subReqList.E2APSubscriptionRequests))

	var xAppEventInstanceID int64
	var e2EventInstanceID int64
	errorInfo := &ErrorInfo{}

	defer restDuplicateCtrl.SetMd5sumFromLastOkRequest(*restSubId, md5sum)

	for index := 0; index < len(subReqList.E2APSubscriptionRequests); index++ {
		subReqMsg := subReqList.E2APSubscriptionRequests[index]
		xAppEventInstanceID = (int64)(subReqMsg.RequestId.Id)

		trans := c.tracker.NewXappTransaction(xapp.NewRmrEndpoint(xAppRmrEndpoint), *restSubId, subReqMsg.RequestId, &xapp.RMRMeid{RanName: *meid})
		if trans == nil {
			// Send notification to xApp that prosessing of a Subscription Request has failed.
			err := fmt.Errorf("Tracking failure")
			errorInfo.ErrorCause = err.Error()
			c.sendUnsuccesfullResponseNotification(restSubId, restSubscription, xAppEventInstanceID, err, clientEndpoint, trans, errorInfo)
			continue
		}

		xapp.Logger.Debug("Handle SubscriptionRequest index=%v, %s", index, idstring(nil, trans))

		subRespMsg, errorInfo, err := c.handleSubscriptionRequest(trans, &subReqMsg, meid, *restSubId, e2SubscriptionDirectives)

		xapp.Logger.Debug("Handled SubscriptionRequest index=%v, %s", index, idstring(nil, trans))

		if err != nil {
			c.sendUnsuccesfullResponseNotification(restSubId, restSubscription, xAppEventInstanceID, err, clientEndpoint, trans, errorInfo)
		} else {
			e2EventInstanceID = (int64)(subRespMsg.RequestId.InstanceId)
			restSubscription.AddMd5Sum(md5sum)
			xapp.Logger.Debug("SubscriptionRequest index=%v processed successfullyfor %s. endpoint=%v:%v, XappEventInstanceID=%v, E2EventInstanceID=%v, %s",
				index, *restSubId, clientEndpoint.Host, *clientEndpoint.HTTPPort, xAppEventInstanceID, e2EventInstanceID, idstring(nil, trans))
			c.sendSuccesfullResponseNotification(restSubId, restSubscription, xAppEventInstanceID, e2EventInstanceID, clientEndpoint, trans)
		}
		trans.Release()
	}
}

//-------------------------------------------------------------------
//
//------------------------------------------------------------------
func (c *Control) handleSubscriptionRequest(trans *TransactionXapp, subReqMsg *e2ap.E2APSubscriptionRequest, meid *string,
	restSubId string, e2SubscriptionDirectives *E2SubscriptionDirectives) (*e2ap.E2APSubscriptionResponse, *ErrorInfo, error) {

	errorInfo := ErrorInfo{}

	err := c.tracker.Track(trans)
	if err != nil {
		xapp.Logger.Error("XAPP-SubReq Tracking error: %s", idstring(err, trans))
		errorInfo.ErrorCause = err.Error()
		err = fmt.Errorf("Tracking failure")
		return nil, &errorInfo, err
	}

	subs, errorInfo, err := c.registry.AssignToSubscription(trans, subReqMsg, c.ResetTestFlag, c, e2SubscriptionDirectives.CreateRMRRoute)
	if err != nil {
		xapp.Logger.Error("XAPP-SubReq Assign error: %s", idstring(err, trans))
		return nil, &errorInfo, err
	}

	//
	// Wake subs request
	//
	go c.handleSubscriptionCreate(subs, trans, e2SubscriptionDirectives)
	event, _ := trans.WaitEvent(0) //blocked wait as timeout is handled in subs side

	err = nil
	if event != nil {
		switch themsg := event.(type) {
		case *e2ap.E2APSubscriptionResponse:
			trans.Release()
			return themsg, &errorInfo, nil
		case *e2ap.E2APSubscriptionFailure:
			err = fmt.Errorf("E2 SubscriptionFailure received")
			errorInfo.SetInfo(err.Error(), models.SubscriptionInstanceErrorSourceE2Node, "")
			return nil, &errorInfo, err
		case *PackSubscriptionRequestErrortEvent:
			err = fmt.Errorf("E2 SubscriptionRequest pack failure")
			return nil, &themsg.ErrorInfo, err
		case *SDLWriteErrortEvent:
			err = fmt.Errorf("SDL write failure")
			return nil, &themsg.ErrorInfo, err
		default:
			err = fmt.Errorf("Unexpected E2 subscription response received")
			errorInfo.SetInfo(err.Error(), models.SubscriptionInstanceErrorSourceE2Node, "")
			break
		}
	} else {
		err = fmt.Errorf("E2 subscription response timeout")
		errorInfo.SetInfo(err.Error(), "", models.SubscriptionInstanceTimeoutTypeE2Timeout)
		if subs.PolicyUpdate == true {
			return nil, &errorInfo, err
		}
	}

	xapp.Logger.Error("XAPP-SubReq E2 subscription failed %s", idstring(err, trans, subs))
	c.registry.RemoveFromSubscription(subs, trans, waitRouteCleanup_ms, c)
	return nil, &errorInfo, err
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func (c *Control) sendUnsuccesfullResponseNotification(restSubId *string, restSubscription *RESTSubscription, xAppEventInstanceID int64, err error,
	clientEndpoint *models.SubscriptionParamsClientEndpoint, trans *TransactionXapp, errorInfo *ErrorInfo) {

	// Send notification to xApp that prosessing of a Subscription Request has failed.
	e2EventInstanceID := (int64)(0)
	if errorInfo.ErrorSource == "" {
		// Submgr is default source of error
		errorInfo.ErrorSource = models.SubscriptionInstanceErrorSourceSUBMGR
	}
	resp := &models.SubscriptionResponse{
		SubscriptionID: restSubId,
		SubscriptionInstances: []*models.SubscriptionInstance{
			&models.SubscriptionInstance{E2EventInstanceID: &e2EventInstanceID,
				ErrorCause:          &errorInfo.ErrorCause,
				ErrorSource:         &errorInfo.ErrorSource,
				TimeoutType:         &errorInfo.TimeoutType,
				XappEventInstanceID: &xAppEventInstanceID},
		},
	}
	// Mark REST subscription request processed.
	restSubscription.SetProcessed(err)
	c.UpdateRESTSubscriptionInDB(*restSubId, restSubscription, false)
	if trans != nil {
		xapp.Logger.Debug("Sending unsuccessful REST notification (cause %s) to endpoint=%v:%v, XappEventInstanceID=%v, E2EventInstanceID=%v, %s",
			errorInfo.ErrorCause, clientEndpoint.Host, *clientEndpoint.HTTPPort, xAppEventInstanceID, e2EventInstanceID, idstring(nil, trans))
	} else {
		xapp.Logger.Debug("Sending unsuccessful REST notification (cause %s) to endpoint=%v:%v, XappEventInstanceID=%v, E2EventInstanceID=%v",
			errorInfo.ErrorCause, clientEndpoint.Host, *clientEndpoint.HTTPPort, xAppEventInstanceID, e2EventInstanceID)
	}

	c.UpdateCounter(cRestSubFailNotifToXapp)
	xapp.Subscription.Notify(resp, *clientEndpoint)
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func (c *Control) sendSuccesfullResponseNotification(restSubId *string, restSubscription *RESTSubscription, xAppEventInstanceID int64, e2EventInstanceID int64,
	clientEndpoint *models.SubscriptionParamsClientEndpoint, trans *TransactionXapp) {

	// Store successfully processed InstanceId for deletion
	restSubscription.AddE2InstanceId((uint32)(e2EventInstanceID))
	restSubscription.AddXappIdToE2Id(xAppEventInstanceID, e2EventInstanceID)

	// Send notification to xApp that a Subscription Request has been processed.
	resp := &models.SubscriptionResponse{
		SubscriptionID: restSubId,
		SubscriptionInstances: []*models.SubscriptionInstance{
			&models.SubscriptionInstance{E2EventInstanceID: &e2EventInstanceID,
				ErrorCause:          nil,
				XappEventInstanceID: &xAppEventInstanceID},
		},
	}
	// Mark REST subscription request processesd.
	restSubscription.SetProcessed(nil)
	c.UpdateRESTSubscriptionInDB(*restSubId, restSubscription, false)
	xapp.Logger.Debug("Sending successful REST notification to endpoint=%v:%v, XappEventInstanceID=%v, E2EventInstanceID=%v, %s",
		clientEndpoint.Host, *clientEndpoint.HTTPPort, xAppEventInstanceID, e2EventInstanceID, idstring(nil, trans))

	c.UpdateCounter(cRestSubNotifToXapp)
	xapp.Subscription.Notify(resp, *clientEndpoint)
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func (c *Control) RESTSubscriptionDeleteHandler(restSubId string) int {

	c.CntRecvMsg++
	c.UpdateCounter(cRestSubDelReqFromXapp)

	xapp.Logger.Debug("SubscriptionDeleteRequest from XAPP")

	restSubscription, err := c.registry.GetRESTSubscription(restSubId, true)
	if err != nil {
		xapp.Logger.Error("%s", err.Error())
		if restSubscription == nil {
			// Subscription was not found
			return common.UnsubscribeNoContentCode
		} else {
			if restSubscription.SubReqOngoing == true {
				err := fmt.Errorf("Handling of the REST Subscription Request still ongoing %s", restSubId)
				xapp.Logger.Error("%s", err.Error())
				return common.UnsubscribeBadRequestCode
			} else if restSubscription.SubDelReqOngoing == true {
				// Previous request for same restSubId still ongoing
				return common.UnsubscribeBadRequestCode
			}
		}
	}

	xAppRmrEndPoint := restSubscription.xAppRmrEndPoint
	go func() {
		xapp.Logger.Debug("Deleteting handler: processing instances = %v", restSubscription.InstanceIds)
		for _, instanceId := range restSubscription.InstanceIds {
			xAppEventInstanceID, err := c.SubscriptionDeleteHandler(&restSubId, &xAppRmrEndPoint, &restSubscription.Meid, instanceId)

			if err != nil {
				xapp.Logger.Error("%s", err.Error())
			}
			xapp.Logger.Debug("Deleteting instanceId = %v", instanceId)
			restSubscription.DeleteXappIdToE2Id(xAppEventInstanceID)
			restSubscription.DeleteE2InstanceId(instanceId)
		}
		restDuplicateCtrl.DeleteLastKnownRestSubsIdBasedOnMd5sum(restSubscription.lastReqMd5sum)
		c.registry.DeleteRESTSubscription(&restSubId)
		c.RemoveRESTSubscriptionFromDb(restSubId)
	}()

	c.UpdateCounter(cRestSubDelRespToXapp)

	return common.UnsubscribeNoContentCode
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func (c *Control) SubscriptionDeleteHandler(restSubId *string, endPoint *string, meid *string, instanceId uint32) (int64, error) {

	var xAppEventInstanceID int64
	subs, err := c.registry.GetSubscriptionFirstMatch([]uint32{instanceId})
	if err != nil {
		xapp.Logger.Debug("Subscription Delete Handler subscription for restSubId=%v, E2EventInstanceID=%v not found %s",
			restSubId, instanceId, idstring(err, nil))
		return xAppEventInstanceID, nil
	}

	xAppEventInstanceID = int64(subs.ReqId.Id)
	trans := c.tracker.NewXappTransaction(xapp.NewRmrEndpoint(*endPoint), *restSubId, e2ap.RequestId{subs.ReqId.Id, 0}, &xapp.RMRMeid{RanName: *meid})
	if trans == nil {
		err := fmt.Errorf("XAPP-SubDelReq transaction not created. restSubId %s, endPoint %s, meid %s, instanceId %v", *restSubId, *endPoint, *meid, instanceId)
		xapp.Logger.Error("%s", err.Error())
	}
	defer trans.Release()

	err = c.tracker.Track(trans)
	if err != nil {
		err := fmt.Errorf("XAPP-SubDelReq %s:", idstring(err, trans))
		xapp.Logger.Error("%s", err.Error())
		return xAppEventInstanceID, &time.ParseError{}
	}
	//
	// Wake subs delete
	//
	go c.handleSubscriptionDelete(subs, trans)
	trans.WaitEvent(0) //blocked wait as timeout is handled in subs side

	xapp.Logger.Debug("XAPP-SubDelReq: Handling event %s ", idstring(nil, trans, subs))

	c.registry.RemoveFromSubscription(subs, trans, waitRouteCleanup_ms, c)

	return xAppEventInstanceID, nil
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func (c *Control) RESTQueryHandler() (models.SubscriptionList, error) {
	xapp.Logger.Debug("RESTQueryHandler() called")

	c.CntRecvMsg++

	return c.registry.QueryHandler()
}

func (c *Control) TestRestHandler(w http.ResponseWriter, r *http.Request) {
	xapp.Logger.Debug("RESTTestRestHandler() called")

	pathParams := mux.Vars(r)
	s := pathParams["testId"]

	// This can be used to delete single subscription from db
	if contains := strings.Contains(s, "deletesubid="); contains == true {
		var splits = strings.Split(s, "=")
		if subId, err := strconv.ParseInt(splits[1], 10, 64); err == nil {
			xapp.Logger.Debug("RemoveSubscriptionFromSdl() called. subId = %v", subId)
			c.RemoveSubscriptionFromSdl(uint32(subId))
			return
		}
	}

	// This can be used to remove all subscriptions db from
	if s == "emptydb" {
		xapp.Logger.Debug("RemoveAllSubscriptionsFromSdl() called")
		c.RemoveAllSubscriptionsFromSdl()
		c.RemoveAllRESTSubscriptionsFromSdl()
		return
	}

	// This is meant to cause submgr's restart in testing
	if s == "restart" {
		xapp.Logger.Debug("os.Exit(1) called")
		os.Exit(1)
	}

	xapp.Logger.Debug("Unsupported rest command received %s", s)
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------

func (c *Control) rmrSendToE2T(desc string, subs *Subscription, trans *TransactionSubs) (err error) {
	params := &xapp.RMRParams{}
	params.Mtype = trans.GetMtype()
	params.SubId = int(subs.GetReqId().InstanceId)
	params.Xid = ""
	params.Meid = subs.GetMeid()
	params.Src = ""
	params.PayloadLen = len(trans.Payload.Buf)
	params.Payload = trans.Payload.Buf
	params.Mbuf = nil
	xapp.Logger.Debug("MSG to E2T: %s %s %s", desc, trans.String(), params.String())
	err = c.SendWithRetry(params, false, 5)
	if err != nil {
		xapp.Logger.Error("rmrSendToE2T: Send failed: %+v", err)
	}
	return err
}

func (c *Control) rmrSendToXapp(desc string, subs *Subscription, trans *TransactionXapp) (err error) {

	params := &xapp.RMRParams{}
	params.Mtype = trans.GetMtype()
	params.SubId = int(subs.GetReqId().InstanceId)
	params.Xid = trans.GetXid()
	params.Meid = trans.GetMeid()
	params.Src = ""
	params.PayloadLen = len(trans.Payload.Buf)
	params.Payload = trans.Payload.Buf
	params.Mbuf = nil
	xapp.Logger.Debug("MSG to XAPP: %s %s %s", desc, trans.String(), params.String())
	err = c.SendWithRetry(params, false, 5)
	if err != nil {
		xapp.Logger.Error("rmrSendToXapp: Send failed: %+v", err)
	}
	return err
}

func (c *Control) Consume(msg *xapp.RMRParams) (err error) {
	if c.RMRClient == nil {
		err = fmt.Errorf("Rmr object nil can handle %s", msg.String())
		xapp.Logger.Error("%s", err.Error())
		return
	}
	c.CntRecvMsg++

	defer c.RMRClient.Free(msg.Mbuf)

	// xapp-frame might use direct access to c buffer and
	// when msg.Mbuf is freed, someone might take it into use
	// and payload data might be invalid inside message handle function
	//
	// subscriptions won't load system a lot so there is no
	// real performance hit by cloning buffer into new go byte slice
	cPay := append(msg.Payload[:0:0], msg.Payload...)
	msg.Payload = cPay
	msg.PayloadLen = len(cPay)

	switch msg.Mtype {
	case xapp.RIC_SUB_REQ:
		go c.handleXAPPSubscriptionRequest(msg)
	case xapp.RIC_SUB_RESP:
		go c.handleE2TSubscriptionResponse(msg)
	case xapp.RIC_SUB_FAILURE:
		go c.handleE2TSubscriptionFailure(msg)
	case xapp.RIC_SUB_DEL_REQ:
		go c.handleXAPPSubscriptionDeleteRequest(msg)
	case xapp.RIC_SUB_DEL_RESP:
		go c.handleE2TSubscriptionDeleteResponse(msg)
	case xapp.RIC_SUB_DEL_FAILURE:
		go c.handleE2TSubscriptionDeleteFailure(msg)
	default:
		xapp.Logger.Debug("Unknown Message Type '%d', discarding", msg.Mtype)
	}
	return
}

//-------------------------------------------------------------------
// handle from XAPP Subscription Request
//------------------------------------------------------------------
func (c *Control) handleXAPPSubscriptionRequest(params *xapp.RMRParams) {
	xapp.Logger.Debug("MSG from XAPP: %s", params.String())
	c.UpdateCounter(cSubReqFromXapp)

	subReqMsg, err := c.e2ap.UnpackSubscriptionRequest(params.Payload)
	if err != nil {
		xapp.Logger.Error("XAPP-SubReq: %s", idstring(err, params))
		return
	}

	trans := c.tracker.NewXappTransaction(xapp.NewRmrEndpoint(params.Src), params.Xid, subReqMsg.RequestId, params.Meid)
	if trans == nil {
		xapp.Logger.Error("XAPP-SubReq: %s", idstring(fmt.Errorf("transaction not created"), params))
		return
	}
	defer trans.Release()

	if err = c.tracker.Track(trans); err != nil {
		xapp.Logger.Error("XAPP-SubReq: %s", idstring(err, trans))
		return
	}

	//TODO handle subscription toward e2term inside AssignToSubscription / hide handleSubscriptionCreate in it?
	subs, _, err := c.registry.AssignToSubscription(trans, subReqMsg, c.ResetTestFlag, c, true)
	if err != nil {
		xapp.Logger.Error("XAPP-SubReq: %s", idstring(err, trans))
		return
	}

	c.wakeSubscriptionRequest(subs, trans)
}

//-------------------------------------------------------------------
// Wake Subscription Request to E2node
//------------------------------------------------------------------
func (c *Control) wakeSubscriptionRequest(subs *Subscription, trans *TransactionXapp) {

	e2SubscriptionDirectives, _ := c.GetE2SubscriptionDirectives(nil)
	go c.handleSubscriptionCreate(subs, trans, e2SubscriptionDirectives)
	event, _ := trans.WaitEvent(0) //blocked wait as timeout is handled in subs side
	var err error
	if event != nil {
		switch themsg := event.(type) {
		case *e2ap.E2APSubscriptionResponse:
			themsg.RequestId.Id = trans.RequestId.Id
			trans.Mtype, trans.Payload, err = c.e2ap.PackSubscriptionResponse(themsg)
			if err == nil {
				trans.Release()
				c.UpdateCounter(cSubRespToXapp)
				c.rmrSendToXapp("", subs, trans)
				return
			}
		case *e2ap.E2APSubscriptionFailure:
			themsg.RequestId.Id = trans.RequestId.Id
			trans.Mtype, trans.Payload, err = c.e2ap.PackSubscriptionFailure(themsg)
			if err == nil {
				c.UpdateCounter(cSubFailToXapp)
				c.rmrSendToXapp("", subs, trans)
			}
		default:
			break
		}
	}
	xapp.Logger.Debug("XAPP-SubReq: failed %s", idstring(err, trans, subs))
	//c.registry.RemoveFromSubscription(subs, trans, 5*time.Second)
}

//-------------------------------------------------------------------
// handle from XAPP Subscription Delete Request
//------------------------------------------------------------------
func (c *Control) handleXAPPSubscriptionDeleteRequest(params *xapp.RMRParams) {
	xapp.Logger.Debug("MSG from XAPP: %s", params.String())
	c.UpdateCounter(cSubDelReqFromXapp)

	subDelReqMsg, err := c.e2ap.UnpackSubscriptionDeleteRequest(params.Payload)
	if err != nil {
		xapp.Logger.Error("XAPP-SubDelReq %s", idstring(err, params))
		return
	}

	trans := c.tracker.NewXappTransaction(xapp.NewRmrEndpoint(params.Src), params.Xid, subDelReqMsg.RequestId, params.Meid)
	if trans == nil {
		xapp.Logger.Error("XAPP-SubDelReq: %s", idstring(fmt.Errorf("transaction not created"), params))
		return
	}
	defer trans.Release()

	err = c.tracker.Track(trans)
	if err != nil {
		xapp.Logger.Error("XAPP-SubReq: %s", idstring(err, trans))
		return
	}

	subs, err := c.registry.GetSubscriptionFirstMatch([]uint32{trans.GetSubId()})
	if err != nil {
		xapp.Logger.Error("XAPP-SubDelReq: %s", idstring(err, trans))
		return
	}

	//
	// Wake subs delete
	//
	go c.handleSubscriptionDelete(subs, trans)
	trans.WaitEvent(0) //blocked wait as timeout is handled in subs side

	xapp.Logger.Debug("XAPP-SubDelReq: Handling event %s ", idstring(nil, trans, subs))

	if subs.NoRespToXapp == true {
		// Do no send delete responses to xapps due to submgr restart is deleting uncompleted subscriptions
		xapp.Logger.Debug("XAPP-SubDelReq: subs.NoRespToXapp == true")
		return
	}

	// Whatever is received success, fail or timeout, send successful delete response
	subDelRespMsg := &e2ap.E2APSubscriptionDeleteResponse{}
	subDelRespMsg.RequestId.Id = trans.RequestId.Id
	subDelRespMsg.RequestId.InstanceId = subs.GetReqId().RequestId.InstanceId
	subDelRespMsg.FunctionId = subs.SubReqMsg.FunctionId
	trans.Mtype, trans.Payload, err = c.e2ap.PackSubscriptionDeleteResponse(subDelRespMsg)
	if err == nil {
		c.UpdateCounter(cSubDelRespToXapp)
		c.rmrSendToXapp("", subs, trans)
	}

	//TODO handle subscription toward e2term insiged RemoveFromSubscription / hide handleSubscriptionDelete in it?
	//c.registry.RemoveFromSubscription(subs, trans, 5*time.Second)
}

//-------------------------------------------------------------------
// SUBS CREATE Handling
//-------------------------------------------------------------------
func (c *Control) handleSubscriptionCreate(subs *Subscription, parentTrans *TransactionXapp, e2SubscriptionDirectives *E2SubscriptionDirectives) {

	var event interface{} = nil
	var removeSubscriptionFromDb bool = false
	trans := c.tracker.NewSubsTransaction(subs)
	subs.WaitTransactionTurn(trans)
	defer subs.ReleaseTransactionTurn(trans)
	defer trans.Release()

	xapp.Logger.Debug("SUBS-SubReq: Handling %s ", idstring(nil, trans, subs, parentTrans))

	subRfMsg, valid := subs.GetCachedResponse()
	if subRfMsg == nil && valid == true {
		event = c.sendE2TSubscriptionRequest(subs, trans, parentTrans, e2SubscriptionDirectives)
		switch event.(type) {
		case *e2ap.E2APSubscriptionResponse:
			subRfMsg, valid = subs.SetCachedResponse(event, true)
			subs.SubRespRcvd = true
		case *e2ap.E2APSubscriptionFailure:
			removeSubscriptionFromDb = true
			subRfMsg, valid = subs.SetCachedResponse(event, false)
			xapp.Logger.Debug("SUBS-SubReq: internal delete due failure event(%s) %s", typeofSubsMessage(event), idstring(nil, trans, subs, parentTrans))
			c.sendE2TSubscriptionDeleteRequest(subs, trans, parentTrans)
		case *SubmgrRestartTestEvent:
			// This simulates that no response has been received and after restart subscriptions are restored from db
			xapp.Logger.Debug("Test restart flag is active. Dropping this transaction to test restart case")
		case *PackSubscriptionRequestErrortEvent, *SDLWriteErrortEvent:
			subRfMsg, valid = subs.SetCachedResponse(event, false)
		default:
			if subs.PolicyUpdate == false {
				xapp.Logger.Debug("SUBS-SubReq: internal delete due default event(%s) %s", typeofSubsMessage(event), idstring(nil, trans, subs, parentTrans))
				removeSubscriptionFromDb = true
				subRfMsg, valid = subs.SetCachedResponse(nil, false)
				c.sendE2TSubscriptionDeleteRequest(subs, trans, parentTrans)
			}
		}
		xapp.Logger.Debug("SUBS-SubReq: Handling (e2t response %s) %s", typeofSubsMessage(subRfMsg), idstring(nil, trans, subs, parentTrans))
	} else {
		xapp.Logger.Debug("SUBS-SubReq: Handling (cached response %s) %s", typeofSubsMessage(subRfMsg), idstring(nil, trans, subs, parentTrans))
	}

	err := c.UpdateSubscriptionInDB(subs, removeSubscriptionFromDb)
	if err != nil {
		subRfMsg, valid = subs.SetCachedResponse(event, false)
		c.sendE2TSubscriptionDeleteRequest(subs, trans, parentTrans)
	}

	//Now RemoveFromSubscription in here to avoid race conditions (mostly concerns delete)
	if valid == false {
		c.registry.RemoveFromSubscription(subs, parentTrans, waitRouteCleanup_ms, c)
	}

	parentTrans.SendEvent(subRfMsg, 0)
}

//-------------------------------------------------------------------
// SUBS DELETE Handling
//-------------------------------------------------------------------

func (c *Control) handleSubscriptionDelete(subs *Subscription, parentTrans *TransactionXapp) {

	trans := c.tracker.NewSubsTransaction(subs)
	subs.WaitTransactionTurn(trans)
	defer subs.ReleaseTransactionTurn(trans)
	defer trans.Release()

	xapp.Logger.Debug("SUBS-SubDelReq: Handling %s", idstring(nil, trans, subs, parentTrans))

	subs.mutex.Lock()

	if subs.valid && subs.EpList.HasEndpoint(parentTrans.GetEndpoint()) && subs.EpList.Size() == 1 {
		subs.valid = false
		subs.mutex.Unlock()
		c.sendE2TSubscriptionDeleteRequest(subs, trans, parentTrans)
	} else {
		subs.mutex.Unlock()
	}
	//Now RemoveFromSubscription in here to avoid race conditions (mostly concerns delete)
	//  If parallel deletes ongoing both might pass earlier sendE2TSubscriptionDeleteRequest(...) if
	//  RemoveFromSubscription locates in caller side (now in handleXAPPSubscriptionDeleteRequest(...))
	c.registry.RemoveFromSubscription(subs, parentTrans, waitRouteCleanup_ms, c)
	c.registry.UpdateSubscriptionToDb(subs, c)
	parentTrans.SendEvent(nil, 0)
}

//-------------------------------------------------------------------
// send to E2T Subscription Request
//-------------------------------------------------------------------
func (c *Control) sendE2TSubscriptionRequest(subs *Subscription, trans *TransactionSubs, parentTrans *TransactionXapp, e2SubscriptionDirectives *E2SubscriptionDirectives) interface{} {
	var err error
	var event interface{} = nil
	var timedOut bool = false
	const ricRequestorId = 123

	subReqMsg := subs.SubReqMsg
	subReqMsg.RequestId = subs.GetReqId().RequestId
	subReqMsg.RequestId.Id = ricRequestorId
	trans.Mtype, trans.Payload, err = c.e2ap.PackSubscriptionRequest(subReqMsg)
	if err != nil {
		xapp.Logger.Error("SUBS-SubReq: %s", idstring(err, trans, subs, parentTrans))
		return &PackSubscriptionRequestErrortEvent{
			ErrorInfo{
				ErrorSource: models.SubscriptionInstanceErrorSourceASN1,
				ErrorCause:  err.Error(),
			},
		}
	}

	// Write uncompleted subscrition in db. If no response for subscrition it need to be re-processed (deleted) after restart
	err = c.WriteSubscriptionToDb(subs)
	if err != nil {
		return &SDLWriteErrortEvent{
			ErrorInfo{
				ErrorSource: models.SubscriptionInstanceErrorSourceDBAAS,
				ErrorCause:  err.Error(),
			},
		}
	}

	for retries := int64(0); retries < e2SubscriptionDirectives.E2MaxTryCount; retries++ {
		desc := fmt.Sprintf("(retry %d)", retries)
		if retries == 0 {
			c.UpdateCounter(cSubReqToE2)
		} else {
			c.UpdateCounter(cSubReReqToE2)
		}
		c.rmrSendToE2T(desc, subs, trans)
		if subs.DoNotWaitSubResp == false {
			event, timedOut = trans.WaitEvent(e2SubscriptionDirectives.E2TimeoutTimerValue)
			if timedOut {
				c.UpdateCounter(cSubReqTimerExpiry)
				continue
			}
		} else {
			// Simulating case where subscrition request has been sent but response has not been received before restart
			event = &SubmgrRestartTestEvent{}
			xapp.Logger.Debug("Restart event, DoNotWaitSubResp == true")
		}
		break
	}
	xapp.Logger.Debug("SUBS-SubReq: Response handling event(%s) %s", typeofSubsMessage(event), idstring(nil, trans, subs, parentTrans))
	return event
}

//-------------------------------------------------------------------
// send to E2T Subscription Delete Request
//-------------------------------------------------------------------

func (c *Control) sendE2TSubscriptionDeleteRequest(subs *Subscription, trans *TransactionSubs, parentTrans *TransactionXapp) interface{} {
	var err error
	var event interface{}
	var timedOut bool
	const ricRequestorId = 123

	subDelReqMsg := &e2ap.E2APSubscriptionDeleteRequest{}
	subDelReqMsg.RequestId = subs.GetReqId().RequestId
	subDelReqMsg.RequestId.Id = ricRequestorId
	subDelReqMsg.FunctionId = subs.SubReqMsg.FunctionId
	trans.Mtype, trans.Payload, err = c.e2ap.PackSubscriptionDeleteRequest(subDelReqMsg)
	if err != nil {
		xapp.Logger.Error("SUBS-SubDelReq: %s", idstring(err, trans, subs, parentTrans))
		return event
	}

	for retries := uint64(0); retries < e2tMaxSubDelReqTryCount; retries++ {
		desc := fmt.Sprintf("(retry %d)", retries)
		if retries == 0 {
			c.UpdateCounter(cSubDelReqToE2)
		} else {
			c.UpdateCounter(cSubDelReReqToE2)
		}
		c.rmrSendToE2T(desc, subs, trans)
		event, timedOut = trans.WaitEvent(e2tSubDelReqTime)
		if timedOut {
			c.UpdateCounter(cSubDelReqTimerExpiry)
			continue
		}
		break
	}
	xapp.Logger.Debug("SUBS-SubDelReq: Response handling event(%s) %s", typeofSubsMessage(event), idstring(nil, trans, subs, parentTrans))
	return event
}

//-------------------------------------------------------------------
// handle from E2T Subscription Response
//-------------------------------------------------------------------
func (c *Control) handleE2TSubscriptionResponse(params *xapp.RMRParams) {
	xapp.Logger.Debug("MSG from E2T: %s", params.String())
	c.UpdateCounter(cSubRespFromE2)

	subRespMsg, err := c.e2ap.UnpackSubscriptionResponse(params.Payload)
	if err != nil {
		xapp.Logger.Error("MSG-SubResp %s", idstring(err, params))
		return
	}
	subs, err := c.registry.GetSubscriptionFirstMatch([]uint32{subRespMsg.RequestId.InstanceId})
	if err != nil {
		xapp.Logger.Error("MSG-SubResp: %s", idstring(err, params))
		return
	}
	trans := subs.GetTransaction()
	if trans == nil {
		err = fmt.Errorf("Ongoing transaction not found")
		xapp.Logger.Error("MSG-SubResp: %s", idstring(err, params, subs))
		return
	}
	sendOk, timedOut := trans.SendEvent(subRespMsg, e2tRecvMsgTimeout)
	if sendOk == false {
		err = fmt.Errorf("Passing event to transaction failed: sendOk(%t) timedOut(%t)", sendOk, timedOut)
		xapp.Logger.Error("MSG-SubResp: %s", idstring(err, trans, subs))
	}
	return
}

//-------------------------------------------------------------------
// handle from E2T Subscription Failure
//-------------------------------------------------------------------
func (c *Control) handleE2TSubscriptionFailure(params *xapp.RMRParams) {
	xapp.Logger.Debug("MSG from E2T: %s", params.String())
	c.UpdateCounter(cSubFailFromE2)
	subFailMsg, err := c.e2ap.UnpackSubscriptionFailure(params.Payload)
	if err != nil {
		xapp.Logger.Error("MSG-SubFail %s", idstring(err, params))
		return
	}
	subs, err := c.registry.GetSubscriptionFirstMatch([]uint32{subFailMsg.RequestId.InstanceId})
	if err != nil {
		xapp.Logger.Error("MSG-SubFail: %s", idstring(err, params))
		return
	}
	trans := subs.GetTransaction()
	if trans == nil {
		err = fmt.Errorf("Ongoing transaction not found")
		xapp.Logger.Error("MSG-SubFail: %s", idstring(err, params, subs))
		return
	}
	sendOk, timedOut := trans.SendEvent(subFailMsg, e2tRecvMsgTimeout)
	if sendOk == false {
		err = fmt.Errorf("Passing event to transaction failed: sendOk(%t) timedOut(%t)", sendOk, timedOut)
		xapp.Logger.Error("MSG-SubFail: %s", idstring(err, trans, subs))
	}
	return
}

//-------------------------------------------------------------------
// handle from E2T Subscription Delete Response
//-------------------------------------------------------------------
func (c *Control) handleE2TSubscriptionDeleteResponse(params *xapp.RMRParams) (err error) {
	xapp.Logger.Debug("MSG from E2T: %s", params.String())
	c.UpdateCounter(cSubDelRespFromE2)
	subDelRespMsg, err := c.e2ap.UnpackSubscriptionDeleteResponse(params.Payload)
	if err != nil {
		xapp.Logger.Error("MSG-SubDelResp: %s", idstring(err, params))
		return
	}
	subs, err := c.registry.GetSubscriptionFirstMatch([]uint32{subDelRespMsg.RequestId.InstanceId})
	if err != nil {
		xapp.Logger.Error("MSG-SubDelResp: %s", idstring(err, params))
		return
	}
	trans := subs.GetTransaction()
	if trans == nil {
		err = fmt.Errorf("Ongoing transaction not found")
		xapp.Logger.Error("MSG-SubDelResp: %s", idstring(err, params, subs))
		return
	}
	sendOk, timedOut := trans.SendEvent(subDelRespMsg, e2tRecvMsgTimeout)
	if sendOk == false {
		err = fmt.Errorf("Passing event to transaction failed: sendOk(%t) timedOut(%t)", sendOk, timedOut)
		xapp.Logger.Error("MSG-SubDelResp: %s", idstring(err, trans, subs))
	}
	return
}

//-------------------------------------------------------------------
// handle from E2T Subscription Delete Failure
//-------------------------------------------------------------------
func (c *Control) handleE2TSubscriptionDeleteFailure(params *xapp.RMRParams) {
	xapp.Logger.Debug("MSG from E2T: %s", params.String())
	c.UpdateCounter(cSubDelFailFromE2)
	subDelFailMsg, err := c.e2ap.UnpackSubscriptionDeleteFailure(params.Payload)
	if err != nil {
		xapp.Logger.Error("MSG-SubDelFail: %s", idstring(err, params))
		return
	}
	subs, err := c.registry.GetSubscriptionFirstMatch([]uint32{subDelFailMsg.RequestId.InstanceId})
	if err != nil {
		xapp.Logger.Error("MSG-SubDelFail: %s", idstring(err, params))
		return
	}
	trans := subs.GetTransaction()
	if trans == nil {
		err = fmt.Errorf("Ongoing transaction not found")
		xapp.Logger.Error("MSG-SubDelFail: %s", idstring(err, params, subs))
		return
	}
	sendOk, timedOut := trans.SendEvent(subDelFailMsg, e2tRecvMsgTimeout)
	if sendOk == false {
		err = fmt.Errorf("Passing event to transaction failed: sendOk(%t) timedOut(%t)", sendOk, timedOut)
		xapp.Logger.Error("MSG-SubDelFail: %s", idstring(err, trans, subs))
	}
	return
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func typeofSubsMessage(v interface{}) string {
	if v == nil {
		return "NIL"
	}
	switch v.(type) {
	//case *e2ap.E2APSubscriptionRequest:
	//	return "SubReq"
	case *e2ap.E2APSubscriptionResponse:
		return "SubResp"
	case *e2ap.E2APSubscriptionFailure:
		return "SubFail"
	//case *e2ap.E2APSubscriptionDeleteRequest:
	//	return "SubDelReq"
	case *e2ap.E2APSubscriptionDeleteResponse:
		return "SubDelResp"
	case *e2ap.E2APSubscriptionDeleteFailure:
		return "SubDelFail"
	default:
		return "Unknown"
	}
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func (c *Control) WriteSubscriptionToDb(subs *Subscription) error {
	xapp.Logger.Debug("WriteSubscriptionToDb() subId = %v", subs.ReqId.InstanceId)
	err := c.WriteSubscriptionToSdl(subs.ReqId.InstanceId, subs)
	if err != nil {
		xapp.Logger.Error("%v", err)
		return err
	}
	return nil
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func (c *Control) UpdateSubscriptionInDB(subs *Subscription, removeSubscriptionFromDb bool) error {

	if removeSubscriptionFromDb == true {
		// Subscription was written in db already when subscription request was sent to BTS, except for merged request
		c.RemoveSubscriptionFromDb(subs)
	} else {
		// Update is needed for successful response and merge case here
		if subs.RetryFromXapp == false {
			err := c.WriteSubscriptionToDb(subs)
			return err
		}
	}
	subs.RetryFromXapp = false
	return nil
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func (c *Control) RemoveSubscriptionFromDb(subs *Subscription) {
	xapp.Logger.Debug("RemoveSubscriptionFromDb() subId = %v", subs.ReqId.InstanceId)
	err := c.RemoveSubscriptionFromSdl(subs.ReqId.InstanceId)
	if err != nil {
		xapp.Logger.Error("%v", err)
	}
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func (c *Control) WriteRESTSubscriptionToDb(restSubId string, restSubs *RESTSubscription) {
	xapp.Logger.Debug("WriteRESTSubscriptionToDb() restSubId = %s", restSubId)
	err := c.WriteRESTSubscriptionToSdl(restSubId, restSubs)
	if err != nil {
		xapp.Logger.Error("%v", err)
	}
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func (c *Control) UpdateRESTSubscriptionInDB(restSubId string, restSubs *RESTSubscription, removeRestSubscriptionFromDb bool) {

	if removeRestSubscriptionFromDb == true {
		// Subscription was written in db already when subscription request was sent to BTS, except for merged request
		c.RemoveRESTSubscriptionFromDb(restSubId)
	} else {
		c.WriteRESTSubscriptionToDb(restSubId, restSubs)
	}
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func (c *Control) RemoveRESTSubscriptionFromDb(restSubId string) {
	xapp.Logger.Debug("RemoveRESTSubscriptionFromDb() restSubId = %s", restSubId)
	err := c.RemoveRESTSubscriptionFromSdl(restSubId)
	if err != nil {
		xapp.Logger.Error("%v", err)
	}
}

func (c *Control) SendSubscriptionDeleteReq(subs *Subscription) {

	const ricRequestorId = 123
	xapp.Logger.Debug("Sending subscription delete due to restart. subId = %v", subs.ReqId.InstanceId)

	// Send delete for every endpoint in the subscription
	if subs.PolicyUpdate == false {
		subDelReqMsg := &e2ap.E2APSubscriptionDeleteRequest{}
		subDelReqMsg.RequestId = subs.GetReqId().RequestId
		subDelReqMsg.RequestId.Id = ricRequestorId
		subDelReqMsg.FunctionId = subs.SubReqMsg.FunctionId
		mType, payload, err := c.e2ap.PackSubscriptionDeleteRequest(subDelReqMsg)
		if err != nil {
			xapp.Logger.Error("SendSubscriptionDeleteReq() %s", idstring(err))
			return
		}
		for _, endPoint := range subs.EpList.Endpoints {
			params := &xapp.RMRParams{}
			params.Mtype = mType
			params.SubId = int(subs.GetReqId().InstanceId)
			params.Xid = ""
			params.Meid = subs.Meid
			params.Src = endPoint.String()
			params.PayloadLen = len(payload.Buf)
			params.Payload = payload.Buf
			params.Mbuf = nil
			subs.DeleteFromDb = true
			c.handleXAPPSubscriptionDeleteRequest(params)
		}
	}
}

func (c *Control) PrintRESTSubscriptionRequest(p *models.SubscriptionParams) {

	fmt.Println("CRESTSubscriptionRequest")

	if p == nil {
		return
	}

	if p.SubscriptionID != "" {
		fmt.Println("  SubscriptionID = ", p.SubscriptionID)
	} else {
		fmt.Println("  SubscriptionID = ''")
	}

	fmt.Printf("  ClientEndpoint.Host = %s\n", p.ClientEndpoint.Host)

	if p.ClientEndpoint.HTTPPort != nil {
		fmt.Printf("  ClientEndpoint.HTTPPort = %v\n", *p.ClientEndpoint.HTTPPort)
	} else {
		fmt.Println("  ClientEndpoint.HTTPPort = nil")
	}

	if p.ClientEndpoint.RMRPort != nil {
		fmt.Printf("  ClientEndpoint.RMRPort = %v\n", *p.ClientEndpoint.RMRPort)
	} else {
		fmt.Println("  ClientEndpoint.RMRPort = nil")
	}

	if p.Meid != nil {
		fmt.Printf("  Meid = %s\n", *p.Meid)
	} else {
		fmt.Println("  Meid = nil")
	}

	if p.E2SubscriptionDirectives == nil {
		fmt.Println("  E2SubscriptionDirectives = nil")
	} else {
		fmt.Println("  E2SubscriptionDirectives")
		if p.E2SubscriptionDirectives.E2RetryCount == nil {
			fmt.Println("    E2RetryCount == nil")
		} else {
			fmt.Printf("    E2RetryCount = %v\n", *p.E2SubscriptionDirectives.E2RetryCount)
		}
		fmt.Printf("    E2TimeoutTimerValue = %v\n", p.E2SubscriptionDirectives.E2TimeoutTimerValue)
		if p.E2SubscriptionDirectives.RMRRoutingNeeded == nil {
			fmt.Println("    RMRRoutingNeeded == nil")
		} else {
			fmt.Printf("    RMRRoutingNeeded = %v\n", *p.E2SubscriptionDirectives.RMRRoutingNeeded)
		}
	}
	for _, subscriptionDetail := range p.SubscriptionDetails {
		if p.RANFunctionID != nil {
			fmt.Printf("  RANFunctionID = %v\n", *p.RANFunctionID)
		} else {
			fmt.Println("  RANFunctionID = nil")
		}
		fmt.Printf("  SubscriptionDetail.XappEventInstanceID = %v\n", *subscriptionDetail.XappEventInstanceID)
		fmt.Printf("  SubscriptionDetail.EventTriggers = %v\n", subscriptionDetail.EventTriggers)

		for _, actionToBeSetup := range subscriptionDetail.ActionToBeSetupList {
			fmt.Printf("  SubscriptionDetail.ActionToBeSetup.ActionID = %v\n", *actionToBeSetup.ActionID)
			fmt.Printf("  SubscriptionDetail.ActionToBeSetup.ActionType = %s\n", *actionToBeSetup.ActionType)
			fmt.Printf("  SubscriptionDetail.ActionToBeSetup.ActionDefinition = %v\n", actionToBeSetup.ActionDefinition)

			if actionToBeSetup.SubsequentAction != nil {
				fmt.Printf("  SubscriptionDetail.ActionToBeSetup.SubsequentAction.SubsequentActionType = %s\n", *actionToBeSetup.SubsequentAction.SubsequentActionType)
				fmt.Printf("  SubscriptionDetail.ActionToBeSetup..SubsequentAction.TimeToWait = %s\n", *actionToBeSetup.SubsequentAction.TimeToWait)
			} else {
				fmt.Println("  SubscriptionDetail.ActionToBeSetup.SubsequentAction = nil")
			}
		}
	}
}