/* ================================================================================== 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" "gerrit.o-ran-sc.org/r/ric-plt/e2ap/pkg/e2ap" "gerrit.o-ran-sc.org/r/ric-plt/xapp-frame/pkg/xapp" "strconv" "sync" "time" ) //----------------------------------------------------------------------------- // //----------------------------------------------------------------------------- type Subscription struct { mutex sync.Mutex // Lock registry *Registry // Registry Seq uint16 // SubsId Meid *xapp.RMRMeid // Meid/ RanName EpList RmrEndpointList // Endpoints DelEpList RmrEndpointList // Endpoints DelSeq uint64 TransLock sync.Mutex // Lock transactions, only one executed per time for subs TheTrans *Transaction // Ongoing transaction from xapp SubReqMsg *e2ap.E2APSubscriptionRequest // Subscription information SubRespMsg *e2ap.E2APSubscriptionResponse // Subscription information } func (s *Subscription) stringImpl() string { return "subs(" + strconv.FormatUint(uint64(s.Seq), 10) + "/" + s.Meid.RanName + "/" + s.EpList.String() + ")" } func (s *Subscription) String() string { s.mutex.Lock() defer s.mutex.Unlock() return s.stringImpl() } func (s *Subscription) GetSubId() uint16 { s.mutex.Lock() defer s.mutex.Unlock() return s.Seq } func (s *Subscription) GetMeid() *xapp.RMRMeid { s.mutex.Lock() defer s.mutex.Unlock() if s.Meid != nil { return s.Meid } return nil } func (s *Subscription) AddEndpoint(ep *RmrEndpoint) error { s.mutex.Lock() defer s.mutex.Unlock() if ep == nil { return fmt.Errorf("AddEndpoint no endpoint given") } if s.EpList.AddEndpoint(ep) { s.DelEpList.DelEndpoint(ep) if s.EpList.Size() == 1 { return s.updateRouteImpl(CREATE) } return s.updateRouteImpl(MERGE) } return nil } func (s *Subscription) DelEndpoint(ep *RmrEndpoint) error { s.mutex.Lock() defer s.mutex.Unlock() var err error if ep == nil { return fmt.Errorf("DelEndpoint no endpoint given") } if s.EpList.HasEndpoint(ep) == false { return fmt.Errorf("DelEndpoint endpoint not found") } if s.DelEpList.HasEndpoint(ep) == true { return fmt.Errorf("DelEndpoint endpoint already under del") } s.DelEpList.AddEndpoint(ep) go s.CleanCheck() return err } func (s *Subscription) CleanCheck() { s.mutex.Lock() defer s.mutex.Unlock() s.DelSeq++ // Only one clean ongoing if s.DelSeq > 1 { return } var currSeq uint64 = 0 // Make sure that routes to be deleted // are not deleted too fast for currSeq < s.DelSeq { currSeq = s.DelSeq s.mutex.Unlock() time.Sleep(5 * time.Second) s.mutex.Lock() } xapp.Logger.Info("DelEndpoint: delete cleaning %s", s.stringImpl()) if s.EpList.Size() <= s.DelEpList.Size() { s.updateRouteImpl(DELETE) go s.registry.DelSubscription(s.Seq) } else if s.EpList.DelEndpoints(&s.DelEpList) { s.updateRouteImpl(MERGE) } s.DelSeq = 0 } func (s *Subscription) IsTransactionReserved() bool { s.mutex.Lock() defer s.mutex.Unlock() if s.TheTrans != nil { return true } return false } func (s *Subscription) GetTransaction() *Transaction { s.mutex.Lock() defer s.mutex.Unlock() return s.TheTrans } func (s *Subscription) WaitTransactionTurn(trans *Transaction) { s.TransLock.Lock() s.mutex.Lock() s.TheTrans = trans s.mutex.Unlock() } func (s *Subscription) ReleaseTransactionTurn(trans *Transaction) { s.mutex.Lock() if trans != nil && trans == s.TheTrans { s.TheTrans = nil } s.mutex.Unlock() s.TransLock.Unlock() } func (s *Subscription) updateRouteImpl(act Action) error { subRouteAction := SubRouteInfo{act, s.EpList, s.Seq} err := s.registry.rtmgrClient.SubscriptionRequestUpdate(subRouteAction) if err != nil { return fmt.Errorf("%s %s", s.stringImpl(), err.Error()) } return nil }