policy-agent/src/main/java/org/oransc/policyagent/tasks/ServiceSupervision.java

   1 /*-
   2  * ========================LICENSE_START=================================
   3  * O-RAN-SC
   4  * %%
   5  * Copyright (C) 2019 Nordix Foundation
   6  * %%
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  * ========================LICENSE_END===================================
  19  */
  20
  21 package org.oransc.policyagent.tasks;
  22
  23 import org.oransc.policyagent.clients.A1ClientFactory;
  24 import org.oransc.policyagent.repository.Policies;
  25 import org.oransc.policyagent.repository.Policy;
  26 import org.oransc.policyagent.repository.Service;
  27 import org.oransc.policyagent.repository.Services;
  28 import org.slf4j.Logger;
  29 import org.slf4j.LoggerFactory;
  30 import org.springframework.beans.factory.annotation.Autowired;
  31 import org.springframework.scheduling.annotation.EnableScheduling;
  32 import org.springframework.scheduling.annotation.Scheduled;
  33 import org.springframework.stereotype.Component;
  34
  35 import reactor.core.publisher.Flux;
  36 import reactor.core.publisher.Mono;
  37
  38 /**
  39  * Periodically checks that services with a keepAliveInterval set are alive. If a service is deemed not alive,
  40  * all the service's policies are deleted, both in the repository and in the affected Rics, and the service is
  41  * removed from the repository. This means that the service needs to register again after this.
  42  */
  43 @Component
  44 @EnableScheduling
  45 public class ServiceSupervision {
  46     private static final Logger logger = LoggerFactory.getLogger(ServiceSupervision.class);
  47     private final Services services;
  48     private final Policies policies;
  49     private A1ClientFactory a1ClientFactory;
  50
  51     @Autowired
  52     public ServiceSupervision(Services services, Policies policies, A1ClientFactory a1ClientFactory) {
  53         this.services = services;
  54         this.policies = policies;
  55         this.a1ClientFactory = a1ClientFactory;
  56     }
  57
  58     @Scheduled(fixedRate = 1000 * 60)
  59     public void checkAllServices() {
  60         logger.debug("Checking services starting");
  61         createTask().subscribe(this::onPolicyDeleted, null, this::onComplete);
  62     }
  63
  64     @SuppressWarnings("squid:S2629") // Invoke method(s) only conditionally
  65     private void onPolicyDeleted(Policy policy) {
  66         logger.debug("Policy deleted due to inactivity: {}, service: {}", policy.id(), policy.ownerServiceName());
  67     }
  68
  69     private void onComplete() {
  70         logger.debug("Checking services completed");
  71     }
  72
  73     private Flux<Policy> createTask() {
  74         synchronized (services) {
  75             return Flux.fromIterable(services.getAll()) //
  76                 .filter(Service::isExpired) //
  77                 .doOnNext(service -> logger.info("Service is expired: {}", service.getName())) //
  78                 .doOnNext(service -> services.remove(service.getName())) //
  79                 .flatMap(this::getAllPoliciesForService) //
  80                 .doOnNext(policies::remove) //
  81                 .flatMap(this::deletePolicyInRic);
  82         }
  83     }
  84
  85     private Flux<Policy> getAllPoliciesForService(Service service) {
  86         synchronized (policies) {
  87             return Flux.fromIterable(policies.getForService(service.getName()));
  88         }
  89     }
  90
  91     private Mono<Policy> deletePolicyInRic(Policy policy) {
  92         return a1ClientFactory.createA1Client(policy.ric()) //
  93             .flatMap(client -> client.deletePolicy(policy) //
  94                 .onErrorResume(exception -> handleDeleteFromRicFailure(policy, exception)) //
  95                 .map(nothing -> policy));
  96     }
  97
  98     @SuppressWarnings("squid:S2629") // Invoke method(s) only conditionally
  99     private Mono<String> handleDeleteFromRicFailure(Policy policy, Throwable e) {
 100         logger.warn("Could not delete policy: {} from ric: {}", policy.id(), policy.ric().name(), e);
 101         return Mono.empty();
 102     }
 103 }