policy-agent/src/main/java/org/oransc/policyagent/tasks/RepositorySupervision.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 java.util.Collection;
  24
  25 import org.oransc.policyagent.clients.A1Client;
  26 import org.oransc.policyagent.repository.Policies;
  27 import org.oransc.policyagent.repository.PolicyTypes;
  28 import org.oransc.policyagent.repository.Ric;
  29 import org.oransc.policyagent.repository.Rics;
  30 import org.slf4j.Logger;
  31 import org.slf4j.LoggerFactory;
  32 import org.springframework.beans.factory.annotation.Autowired;
  33 import org.springframework.scheduling.annotation.EnableScheduling;
  34 import org.springframework.scheduling.annotation.Scheduled;
  35 import org.springframework.stereotype.Component;
  36
  37 import reactor.core.publisher.Flux;
  38 import reactor.core.publisher.Mono;
  39
  40 /**
  41  * Regularly checks the exisiting rics towards the local repository to keep it consistent.
  42  */
  43 @Component
  44 @EnableScheduling
  45 public class RepositorySupervision {
  46     private static final Logger logger = LoggerFactory.getLogger(RepositorySupervision.class);
  47
  48     private final Rics rics;
  49     private final Policies policies;
  50     private final PolicyTypes policyTypes;
  51     private final A1Client a1Client;
  52
  53     @Autowired
  54     public RepositorySupervision(Rics rics, Policies policies, A1Client a1Client, PolicyTypes policyTypes) {
  55         this.rics = rics;
  56         this.policies = policies;
  57         this.a1Client = a1Client;
  58         this.policyTypes = policyTypes;
  59     }
  60
  61     /**
  62      * Regularly contacts all Rics to check if they are alive.
  63      */
  64     @Scheduled(fixedRate = 1000 * 60)
  65     public void checkAllRics() {
  66         logger.debug("Checking Rics starting");
  67         createTask().subscribe(this::onRicChecked, this::onError, this::onComplete);
  68
  69     }
  70
  71     private Flux<Ric> createTask() {
  72         return Flux.fromIterable(rics.getRics()) //
  73             .flatMap(ric -> checkInstances(ric)) //
  74             .flatMap(ric -> checkTypes(ric));
  75     }
  76
  77     private Mono<Ric> checkInstances(Ric ric) {
  78
  79         return a1Client.getPolicyIdentities(ric.getConfig().baseUrl()) //
  80             .onErrorResume(t -> Mono.empty()) //
  81             .flatMap(ricP -> validateInstances(ricP, ric));
  82     }
  83
  84     private Flux<Ric> junk() {
  85         return Flux.empty();
  86     }
  87
  88     private Mono<Ric> validateInstances(Collection<String> ricPolicies, Ric ric) {
  89         if (ricPolicies.size() != policies.getForRic(ric.name()).size()) {
  90             return startRecovery(ric);
  91         }
  92         for (String policyId : ricPolicies) {
  93             if (!policies.containsPolicy(policyId)) {
  94                 return startRecovery(ric);
  95             }
  96         }
  97         return Mono.just(ric);
  98     }
  99
 100     private Mono<Ric> checkTypes(Ric ric) {
 101         return a1Client.getPolicyTypeIdentities(ric.getConfig().baseUrl()) //
 102             .onErrorResume(t -> {
 103                 return Mono.empty();
 104             }) //
 105             .flatMap(ricTypes -> validateTypes(ricTypes, ric));
 106     }
 107
 108     private Mono<Ric> validateTypes(Collection<String> ricTypes, Ric ric) {
 109         if (ricTypes.size() != ric.getSupportedPolicyTypes().size()) {
 110             return startRecovery(ric);
 111         }
 112         for (String typeName : ricTypes) {
 113             if (!ric.isSupportingType(typeName)) {
 114                 return startRecovery(ric);
 115             }
 116         }
 117         return Mono.just(ric);
 118     }
 119
 120     private Mono<Ric> startRecovery(Ric ric) {
 121         RicRecoveryTask recovery = new RicRecoveryTask(a1Client, policyTypes, policies);
 122         recovery.run(ric);
 123         return Mono.empty();
 124     }
 125
 126     private void onRicChecked(Ric ric) {
 127         logger.info("Ric: " + ric.name() + " checked");
 128     }
 129
 130     private void onError(Throwable t) {
 131         logger.error("Rics supervision failed", t);
 132     }
 133
 134     private void onComplete() {
 135         logger.debug("Checking Rics completed");
 136     }
 137
 138 }