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.Ric.RicState;
  30 import org.oransc.policyagent.repository.Rics;
  31 import org.oransc.policyagent.repository.Services;
  32 import org.slf4j.Logger;
  33 import org.slf4j.LoggerFactory;
  34 import org.springframework.beans.factory.annotation.Autowired;
  35 import org.springframework.scheduling.annotation.EnableScheduling;
  36 import org.springframework.scheduling.annotation.Scheduled;
  37 import org.springframework.stereotype.Component;
  38
  39 import reactor.core.publisher.Flux;
  40 import reactor.core.publisher.Mono;
  41
  42 /**
  43  * Regularly checks the exisiting rics towards the local repository to keep it consistent.
  44  */
  45 @Component
  46 @EnableScheduling
  47 public class RepositorySupervision {
  48     private static final Logger logger = LoggerFactory.getLogger(RepositorySupervision.class);
  49
  50     private final Rics rics;
  51     private final Policies policies;
  52     private final PolicyTypes policyTypes;
  53     private final A1Client a1Client;
  54     private final Services services;
  55
  56     @Autowired
  57     public RepositorySupervision(Rics rics, Policies policies, A1Client a1Client, PolicyTypes policyTypes,
  58         Services services) {
  59         this.rics = rics;
  60         this.policies = policies;
  61         this.a1Client = a1Client;
  62         this.policyTypes = policyTypes;
  63         this.services = services;
  64     }
  65
  66     /**
  67      * Regularly contacts all Rics to check if they are alive.
  68      */
  69     @Scheduled(fixedRate = 1000 * 60)
  70     public void checkAllRics() {
  71         logger.debug("Checking Rics starting");
  72         createTask().subscribe(this::onRicChecked, this::onError, this::onComplete);
  73     }
  74
  75     private Flux<Ric> createTask() {
  76         synchronized (this.rics) {
  77             return Flux.fromIterable(rics.getRics()) //
  78                 .flatMap(ric -> checkRicState(ric)) //
  79                 .flatMap(ric -> checkRicPolicies(ric)) //
  80                 .flatMap(ric -> checkRicPolicyTypes(ric));
  81         }
  82     }
  83
  84     private Mono<Ric> checkRicState(Ric ric) {
  85         if (ric.state() == RicState.UNDEFINED) {
  86             return startRecovery(ric);
  87         } else if (ric.state() == RicState.RECOVERING) {
  88             return Mono.empty();
  89         } else {
  90             return Mono.just(ric);
  91         }
  92     }
  93
  94     private Mono<Ric> checkRicPolicies(Ric ric) {
  95         return a1Client.getPolicyIdentities(ric.getConfig().baseUrl()) //
  96             .onErrorResume(t -> Mono.empty()) //
  97             .flatMap(ricP -> validateInstances(ricP, ric));
  98     }
  99
 100     private Mono<Ric> validateInstances(Collection<String> ricPolicies, Ric ric) {
 101         synchronized (this.policies) {
 102             if (ricPolicies.size() != policies.getForRic(ric.name()).size()) {
 103                 return startRecovery(ric);
 104             }
 105         }
 106         for (String policyId : ricPolicies) {
 107             if (!policies.containsPolicy(policyId)) {
 108                 return startRecovery(ric);
 109             }
 110         }
 111         return Mono.just(ric);
 112     }
 113
 114     private Mono<Ric> checkRicPolicyTypes(Ric ric) {
 115         return a1Client.getPolicyTypeIdentities(ric.getConfig().baseUrl()) //
 116             .onErrorResume(t -> {
 117                 return Mono.empty();
 118             }) //
 119             .flatMap(ricTypes -> validateTypes(ricTypes, ric));
 120     }
 121
 122     private Mono<Ric> validateTypes(Collection<String> ricTypes, Ric ric) {
 123         if (ricTypes.size() != ric.getSupportedPolicyTypes().size()) {
 124             return startRecovery(ric);
 125         }
 126         for (String typeName : ricTypes) {
 127             if (!ric.isSupportingType(typeName)) {
 128                 return startRecovery(ric);
 129             }
 130         }
 131         return Mono.just(ric);
 132     }
 133
 134     private Mono<Ric> startRecovery(Ric ric) {
 135         RicRecoveryTask recovery = new RicRecoveryTask(a1Client, policyTypes, policies, services);
 136         recovery.run(ric);
 137         return Mono.empty();
 138     }
 139
 140     private void onRicChecked(Ric ric) {
 141         logger.info("Ric: " + ric.name() + " checked");
 142     }
 143
 144     private void onError(Throwable t) {
 145         logger.error("Rics supervision failed", t);
 146     }
 147
 148     private void onComplete() {
 149         logger.debug("Checking Rics completed");
 150     }
 151
 152 }