/*
==================================================================================
  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"
	"sync"
	"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/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 checkE2State string
var readSubsFromDb string
var dbRetryForever string
var dbTryCount int

type Control struct {
	*xapp.RMRClient
	e2ap              *E2ap
	registry          *Registry
	tracker           *Tracker
	restDuplicateCtrl *DuplicateCtrl
	e2IfState         *E2IfState
	e2IfStateDb       XappRnibInterface
	e2SubsDb          Sdlnterface
	restSubsDb        Sdlnterface
	CntRecvMsg        uint64
	ResetTestFlag     bool
	Counters          map[string]xapp.Counter
	LoggerLevel       int
	UTTesting         bool
}

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()

	restDuplicateCtrl := new(DuplicateCtrl)
	restDuplicateCtrl.Init()

	e2IfState := new(E2IfState)

	c := &Control{e2ap: new(E2ap),
		registry:          registry,
		tracker:           tracker,
		restDuplicateCtrl: restDuplicateCtrl,
		e2IfState:         e2IfState,
		e2IfStateDb:       CreateXappRnibIfInstance(),
		e2SubsDb:          CreateSdl(),
		restSubsDb:        CreateRESTSdl(),
		Counters:          xapp.Metric.RegisterCounterGroup(GetMetricsOpts(), "SUBMGR"),
		LoggerLevel:       1,
	}

	e2IfState.Init(c)
	c.ReadConfigParameters("")

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

	xapp.Resource.InjectRoute("/ric/v1/get_all_e2nodes", c.GetAllE2Nodes, "GET")
	xapp.Resource.InjectRoute("/ric/v1/get_e2node_rest_subscriptions/{ranName}", c.GetAllE2NodeRestSubscriptions, "GET")

	xapp.Resource.InjectRoute("/ric/v1/get_all_xapps", c.GetAllXapps, "GET")
	xapp.Resource.InjectRoute("/ric/v1/get_xapp_rest_restsubscriptions/{xappServiceName}", c.GetAllXappRestSubscriptions, "GET")
	xapp.Resource.InjectRoute("/ric/v1/get_e2subscriptions/{restId}", c.GetE2Subscriptions, "GET")

	xapp.Resource.InjectRoute("/ric/v1/delete_all_e2node_subscriptions/{ranName}", c.DeleteAllE2nodeSubscriptions, "DELETE")
	xapp.Resource.InjectRoute("/ric/v1/delete_all_xapp_subscriptions/{xappServiceName}", c.DeleteAllXappSubscriptions, "DELETE")

	if readSubsFromDb == "true" {
		// Read subscriptions from db
		err := c.ReadE2Subscriptions()
		if err != nil {
			xapp.Logger.Error("ReadE2Subscriptions() failed %s", err.Error())
		}
		err = c.ReadRESTSubscriptions()
		if err != nil {
			xapp.Logger.Error("ReadRESTSubscriptions() failed %s", err.Error())
		}
	}

	go func() {
		err := xapp.Subscription.Listen(c.RESTSubscriptionHandler, c.RESTQueryHandler, c.RESTSubscriptionDeleteHandler)
		if err != nil {
			xapp.Logger.Error("xapp.Subscription.Listen failure: %s", err.Error())
		}
	}()
	return c
}

func (c *Control) SymptomDataHandler(w http.ResponseWriter, r *http.Request) {
	subscriptions, err := c.registry.QueryHandler()
	if err != nil {
		xapp.Logger.Error("QueryHandler() failed %s", err.Error())
	}

	xapp.Resource.SendSymptomDataJson(w, r, subscriptions, "platform/subscriptions.json")
}

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

	c.CntRecvMsg++

	return c.registry.QueryHandler()
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
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
			go c.HandleUncompletedSubscriptions(register)
			return nil
		}
	}
	xapp.Logger.Debug("Continuing without retring")
	return err
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
func (c *Control) ReadRESTSubscriptions() error {

	xapp.Logger.Debug("ReadRESTSubscriptions()")
	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 {
			// Fix REST subscriptions ongoing status after restart
			for restSubId, restSubscription := range restSubscriptions {
				restSubscription.SubReqOngoing = false
				restSubscription.SubDelReqOngoing = false
				err := c.WriteRESTSubscriptionToSdl(restSubId, restSubscription)
				if err != nil {
					xapp.Logger.Error("WriteRESTSubscriptionToSdl() failed:%s", err.Error())
				}
			}
			c.registry.restSubscriptions = restSubscriptions
			return nil
		}
	}
	xapp.Logger.Debug("Continuing without retring")
	return err
}

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

	xapp.Logger.Debug("ReadConfigParameters")

	c.LoggerLevel = int(xapp.Logger.GetLevel())
	xapp.Logger.Info("LoggerLevel = %v", c.LoggerLevel)
	c.e2ap.SetASN1DebugPrintStatus(c.LoggerLevel)

	// viper.GetDuration returns nanoseconds
	e2tSubReqTimeout = viper.GetDuration("controls.e2tSubReqTimeout_ms") * 1000000
	if e2tSubReqTimeout == 0 {
		e2tSubReqTimeout = 2000 * 1000000
		xapp.Logger.Debug("WARNING: Using hard coded default value for e2tSubReqTimeout")
	}
	xapp.Logger.Debug("e2tSubReqTimeout= %v", e2tSubReqTimeout)

	e2tSubDelReqTime = viper.GetDuration("controls.e2tSubDelReqTime_ms") * 1000000
	if e2tSubDelReqTime == 0 {
		e2tSubDelReqTime = 2000 * 1000000
		xapp.Logger.Debug("WARNING: Using hard coded default value for e2tSubDelReqTime")
	}
	xapp.Logger.Debug("e2tSubDelReqTime= %v", e2tSubDelReqTime)

	e2tRecvMsgTimeout = viper.GetDuration("controls.e2tRecvMsgTimeout_ms") * 1000000
	if e2tRecvMsgTimeout == 0 {
		e2tRecvMsgTimeout = 2000 * 1000000
		xapp.Logger.Debug("WARNING: Using hard coded default value for e2tRecvMsgTimeout")
	}
	xapp.Logger.Debug("e2tRecvMsgTimeout= %v", e2tRecvMsgTimeout)

	e2tMaxSubReqTryCount = viper.GetUint64("controls.e2tMaxSubReqTryCount")
	if e2tMaxSubReqTryCount == 0 {
		e2tMaxSubReqTryCount = 1
		xapp.Logger.Debug("WARNING: Using hard coded default value for e2tMaxSubReqTryCount")
	}
	xapp.Logger.Debug("e2tMaxSubReqTryCount= %v", e2tMaxSubReqTryCount)

	e2tMaxSubDelReqTryCount = viper.GetUint64("controls.e2tMaxSubDelReqTryCount")
	if e2tMaxSubDelReqTryCount == 0 {
		e2tMaxSubDelReqTryCount = 1
		xapp.Logger.Debug("WARNING: Using hard coded default value for e2tMaxSubDelReqTryCount")
	}
	xapp.Logger.Debug("e2tMaxSubDelReqTryCount= %v", e2tMaxSubDelReqTryCount)

	checkE2State = viper.GetString("controls.checkE2State")
	if checkE2State == "" {
		checkE2State = "true"
		xapp.Logger.Debug("WARNING: Using hard coded default value for checkE2State")
	}
	xapp.Logger.Debug("checkE2State= %v", checkE2State)

	readSubsFromDb = viper.GetString("controls.readSubsFromDb")
	if readSubsFromDb == "" {
		readSubsFromDb = "true"
		xapp.Logger.Debug("WARNING: Using hard coded default value for readSubsFromDb")
	}
	xapp.Logger.Debug("readSubsFromDb= %v", readSubsFromDb)

	dbTryCount = viper.GetInt("controls.dbTryCount")
	if dbTryCount == 0 {
		dbTryCount = 200
		xapp.Logger.Debug("WARNING: Using hard coded default value for dbTryCount")
	}
	xapp.Logger.Debug("dbTryCount= %v", dbTryCount)

	dbRetryForever = viper.GetString("controls.dbRetryForever")
	if dbRetryForever == "" {
		dbRetryForever = "true"
		xapp.Logger.Debug("WARNING: Using hard coded default value for dbRetryForever")
	}
	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("WARNING: Using hard coded default value for waitRouteCleanup_ms")
	}
	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, xAppServiceName string) (*RESTSubscription, string, error) {

	var restSubId string
	var restSubscription *RESTSubscription
	var err error

	prevRestSubsId, exists := c.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)
				c.restDuplicateCtrl.DeleteLastKnownRestSubsIdBasedOnMd5sum(md5sum)
			}
		}

		if restSubscription == nil {
			restSubId = ksuid.New().String()
			restSubscription = c.registry.CreateRESTSubscription(&restSubId, &xAppServiceName, &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, "", 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 c.e2IfState.IsE2ConnectionUp(p.Meid) == false {
		xapp.Logger.Error("No E2 connection for ranName %v", *p.Meid)
		c.UpdateCounter(cRestReqRejDueE2Down)
		return nil, common.SubscribeServiceUnavailableCode
	}

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

	e2SubscriptionDirectives, err := c.GetE2SubscriptionDirectives(p)
	if err != nil {
		xapp.Logger.Error("%s", err)
		c.UpdateCounter(cRestSubFailToXapp)
		return nil, common.SubscribeBadRequestCode
	}
	_, xAppRmrEndpoint, err := ConstructEndpointAddresses(*p.ClientEndpoint)
	if err != nil {
		xapp.Logger.Error("%s", err.Error())
		c.UpdateCounter(cRestSubFailToXapp)
		return nil, common.SubscribeBadRequestCode
	}

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

	restSubscription, restSubId, err := c.GetOrCreateRestSubscription(p, md5sum, xAppRmrEndpoint, p.ClientEndpoint.Host)
	if err != nil {
		xapp.Logger.Error("Subscription with id in REST request does not exist")
		return nil, common.SubscribeNotFoundCode
	}

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

	duplicate := c.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.registry.DeleteRESTSubscription(&restSubId)
		c.UpdateCounter(cRestSubRespToXapp)
		return &subResp, common.SubscribeCreatedCode
	}

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

	c.SubscriptionProcessingStartDelay()
	xapp.Logger.Debug("E2 SubscriptionRequest count = %v ", len(subReqList.E2APSubscriptionRequests))

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

	defer c.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))
		trans.Release()

		if err != nil {
			if err.Error() == "TEST: restart event received" {
				// This is just for UT cases. Stop here subscription processing
				return
			}
			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, errorInfo)
		}
	}
}

//-------------------------------------------------------------------
//
//------------------------------------------------------------------
func (c *Control) SubscriptionProcessingStartDelay() {
	if c.UTTesting == true {
		// This is temporary fix for the UT problem that notification arrives before subscription response
		// Correct fix would be to allow notification come before response and process it correctly
		xapp.Logger.Debug("Setting 50 ms delay before starting processing Subscriptions")
		<-time.After(time.Millisecond * 50)
		xapp.Logger.Debug("Continuing after delay")
	}
}

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

	err = nil
	if event != nil {
		switch themsg := event.(type) {
		case *e2ap.E2APSubscriptionResponse:
			trans.Release()
			if c.e2IfState.IsE2ConnectionUp(meid) == true {
				errorInfo = c.e2ap.CheckActionNotAdmittedList(xapp.RIC_SUB_RESP, themsg.ActionNotAdmittedList, c)
				return themsg, &errorInfo, nil
			} else {
				c.registry.RemoveFromSubscription(subs, trans, waitRouteCleanup_ms, c)
				c.RemoveSubscriptionFromDb(subs)
				err = fmt.Errorf("E2 interface down")
				errorInfo.SetInfo(err.Error(), models.SubscriptionInstanceErrorSourceE2Node, "")
			}
		case *e2ap.E2APSubscriptionFailure:
			err = fmt.Errorf("RICSubscriptionFailure. E2NodeCause: (Cause:%v, Value %v)", themsg.Cause.Content, themsg.Cause.Value)
			errorInfo.SetInfo(err.Error(), models.SubscriptionInstanceErrorSourceE2Node, "")
		case *PackSubscriptionRequestErrortEvent:
			err = fmt.Errorf("E2 RICSubscriptionRequest pack failure")
			errorInfo = themsg.ErrorInfo
		case *SDLWriteErrortEvent:
			err = fmt.Errorf("SDL write failure")
			errorInfo = themsg.ErrorInfo
		case *SubmgrRestartTestEvent:
			err = fmt.Errorf("TEST: restart event received")
			xapp.Logger.Debug("%s", err)
			return nil, &errorInfo, err
		default:
			err = fmt.Errorf("Unexpected E2 subscription response received")
			errorInfo.SetInfo(err.Error(), models.SubscriptionInstanceErrorSourceE2Node, "")
			break
		}
	} else {
		// Timer expiry
		err = fmt.Errorf("E2 RICSubscriptionResponse 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: ErrorCause:%s, ErrorSource:%s, TimeoutType:%s, to Endpoint=%v:%v, XappEventInstanceID=%v, E2EventInstanceID=%v, %s",
			errorInfo.ErrorCause, errorInfo.ErrorSource, errorInfo.TimeoutType, clientEndpoint.Host, *clientEndpoint.HTTPPort, xAppEventInstanceID, e2EventInstanceID, idstring(nil, trans))
	} else {
		xapp.Logger.Debug("Sending unsuccessful REST notification: ErrorCause:%s, ErrorSource:%s, TimeoutType:%s, to Endpoint=%v:%v, XappEventInstanceID=%v, E2EventInstanceID=%v",
			errorInfo.ErrorCause, errorInfo.ErrorSource, errorInfo.TimeoutType, clientEndpoint.Host, *clientEndpoint.HTTPPort, xAppEventInstanceID, e2EventInstanceID)
	}

	c.UpdateCounter(cRestSubFailNotifToXapp)
	err = xapp.Subscription.Notify(resp, *clientEndpoint)
	if err != nil {
		xapp.Logger.Error("xapp.Subscription.Notify failed %s", err.Error())
	}

	// E2 is down. Delete completely processed request safely now
	if c.e2IfState.IsE2ConnectionUp(&restSubscription.Meid) == false && restSubscription.SubReqOngoing == false {
		c.registry.DeleteRESTSubscription(restSubId)
		c.RemoveRESTSubscriptionFromDb(*restSubId)
	}
}

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

	// 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:          errorInfo.ErrorCause,
				ErrorSource:         errorInfo.ErrorSource,
				XappEventInstanceID: &xAppEventInstanceID},
		},
	}
	// Mark REST subscription request processesd.
	restSubscription.SetProcessed(nil)
	c.UpdateRESTSubscriptionInDB(*restSubId, restSubscription, false)
	xapp.Logger.Debug("Sending successful REST notification: ErrorCause:%s, ErrorSource:%s, TimeoutType:%s, to Endpoint=%v:%v, XappEventInstanceID=%v, E2EventInstanceID=%v, %s",
		errorInfo.ErrorCause, errorInfo.ErrorSource, errorInfo.TimeoutType, clientEndpoint.Host, *clientEndpoint.HTTPPort, xAppEventInstanceID, e2EventInstanceID, idstring(nil, trans))
	c.UpdateCounter(cRestSubNotifToXapp)
	err := xapp.Subscription.Notify(resp, *clientEndpoint)
	if err != nil {
		xapp.Logger.Error("xapp.Subscription.Notify failed %s", err.Error())
	}

	// E2 is down. Delete completely processed request safely now
	if c.e2IfState.IsE2ConnectionUp(&restSubscription.Meid) == false && restSubscription.SubReqOngoing == false {
		c.registry.DeleteRESTSubscription(restSubId)
		c.RemoveRESTSubscriptionFromDb(*restSubId)
	}
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
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
			c.UpdateCounter(cRestSubDelRespToXapp)
			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())
				c.UpdateCounter(cRestSubDelFailToXapp)
				return common.UnsubscribeBadRequestCode
			} else if restSubscription.SubDelReqOngoing == true {
				// Previous request for same restSubId still ongoing
				c.UpdateCounter(cRestSubDelRespToXapp)
				return common.UnsubscribeNoContentCode
			}
		}
	}

	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, 0)

			if err != nil {
				xapp.Logger.Error("%s", err.Error())
			}
			xapp.Logger.Debug("Deleteting instanceId = %v", instanceId)
			restSubscription.DeleteXappIdToE2Id(xAppEventInstanceID)
			restSubscription.DeleteE2InstanceId(instanceId)
		}
		c.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, waitRouteCleanupTime time.Duration) (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
	//
	subs.OngoingDelCount++
	go c.handleSubscriptionDelete(subs, trans, waitRouteCleanupTime)
	trans.WaitEvent(0) //blocked wait as timeout is handled in subs side
	subs.OngoingDelCount--

	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) 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)

	if c.e2IfState.IsE2ConnectionUp(&params.Meid.RanName) == false {
		xapp.Logger.Error("No E2 connection for ranName %v", params.Meid.RanName)
		return
	}

	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
	}

	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, err := c.GetE2SubscriptionDirectives(nil)
	if err != nil {
		xapp.Logger.Error("c.GetE2SubscriptionDirectives failure: %s", err.Error())
	}
	subs.OngoingReqCount++
	go c.handleSubscriptionCreate(subs, trans, e2SubscriptionDirectives, waitRouteCleanup_ms)
	event, _ := trans.WaitEvent(0) //blocked wait as timeout is handled in subs side
	subs.OngoingReqCount--
	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)
				err := c.rmrSendToXapp("", subs, trans)
				if err != nil {
					xapp.Logger.Error("rmrSendToXapp() failed:%s", err.Error())
				}
				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))
}

//-------------------------------------------------------------------
// 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)

	if c.e2IfState.IsE2ConnectionUp(&params.Meid.RanName) == false {
		xapp.Logger.Error("No E2 connection for ranName %v", params.Meid.RanName)
		return
	}

	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
	//
	subs.OngoingDelCount++
	go c.handleSubscriptionDelete(subs, trans, waitRouteCleanup_ms)
	trans.WaitEvent(0) //blocked wait as timeout is handled in subs side
	subs.OngoingDelCount--

	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)
		err := c.rmrSendToXapp("", subs, trans)
		if err != nil {
			xapp.Logger.Error("rmrSendToXapp() failed:%s", err.Error())
		}
	}
}

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

	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:
			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))
		case *SubmgrRestartTestEvent:
			// This is used to simulate 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")
			subRfMsg, valid = subs.SetCachedResponse(event, false)
			parentTrans.SendEvent(subRfMsg, 0)
			return
		case *PackSubscriptionRequestErrortEvent, *SDLWriteErrortEvent:
			subRfMsg, valid = subs.SetCachedResponse(event, false)
		default:
			// Timer expiry
			if subs.PolicyUpdate == false {
				xapp.Logger.Debug("SUBS-SubReq: internal delete due default event(%s) %s", typeofSubsMessage(event), idstring(nil, trans, subs, parentTrans))
				subRfMsg, valid = subs.SetCachedResponse(nil, false)
				c.sendE2TSubscriptionDeleteRequest(subs, trans, parentTrans)
			} else {
				subRfMsg, valid = subs.SetCachedResponse(nil, true)
			}
		}
		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))
	}
	if valid == false {
		removeSubscriptionFromDb = true
	}

	err := c.UpdateSubscriptionInDB(subs, removeSubscriptionFromDb)
	if err != nil {
		valid = 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, waitRouteCleanupTime, c)
	}

	parentTrans.SendEvent(subRfMsg, 0)
}

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

func (c *Control) handleSubscriptionDelete(subs *Subscription, parentTrans *TransactionXapp, waitRouteCleanupTime time.Duration) {

	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)
	c.registry.RemoveFromSubscription(subs, parentTrans, waitRouteCleanupTime, 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 ASN1 pack error: %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)
		}
		err := c.rmrSendToE2T(desc, subs, trans)
		if err != nil {
			xapp.Logger.Error("rmrSendToE2T() failed:%s", err.Error())
		}

		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)
		}
		err := c.rmrSendToE2T(desc, subs, trans)
		if err != nil {
			xapp.Logger.Error("SUBS-SubDelReq: rmrSendToE2T failure: %s", idstring(err, trans, subs, parentTrans))
		}
		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
	}
	xapp.Logger.Debug("SUBS-SubResp: Sending event, trans= %v", trans)
	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) {
	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) {

	if c.UTTesting == true {
		// Reqistry mutex is not locked after real restart but it can be when restart is simulated in unit tests
		c.registry.mutex = new(sync.Mutex)
	}

	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)
		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")
			}
		}
	}
}