policy-agent/src/main/java/org/oransc/policyagent/tasks/RicRecoveryTask.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 import java.util.Vector;
  25
  26 import org.oransc.policyagent.clients.A1Client;
  27 import org.oransc.policyagent.exceptions.ServiceException;
  28 import org.oransc.policyagent.repository.ImmutablePolicyType;
  29 import org.oransc.policyagent.repository.Policies;
  30 import org.oransc.policyagent.repository.Policy;
  31 import org.oransc.policyagent.repository.PolicyType;
  32 import org.oransc.policyagent.repository.PolicyTypes;
  33 import org.oransc.policyagent.repository.Ric;
  34 import org.slf4j.Logger;
  35 import org.slf4j.LoggerFactory;
  36
  37 import reactor.core.publisher.Flux;
  38 import reactor.core.publisher.Mono;
  39
  40 /**
  41  * Loads information about RealTime-RICs at startup.
  42  */
  43 public class RicRecoveryTask {
  44
  45     private static final Logger logger = LoggerFactory.getLogger(RicRecoveryTask.class);
  46
  47     private final A1Client a1Client;
  48     private final PolicyTypes policyTypes;
  49     private final Policies policies;
  50
  51     public RicRecoveryTask(A1Client a1Client, PolicyTypes policyTypes, Policies policies) {
  52         this.a1Client = a1Client;
  53         this.policyTypes = policyTypes;
  54         this.policies = policies;
  55     }
  56
  57     public void run(Collection<Ric> rics) {
  58         for (Ric ric : rics) {
  59             run(ric);
  60         }
  61     }
  62
  63     public void run(Ric ric) {
  64         logger.debug("Handling ric: {}", ric.getConfig().name());
  65
  66         synchronized (ric) {
  67             if (ric.state().equals(Ric.RicState.RECOVERING)) {
  68                 return; // Already running
  69             }
  70             ric.setState(Ric.RicState.RECOVERING);
  71         }
  72         Flux<PolicyType> recoveredTypes = recoverPolicyTypes(ric);
  73         Flux<?> deletedPolicies = deletePolicies(ric);
  74
  75         Flux.merge(recoveredTypes, deletedPolicies) //
  76             .subscribe(x -> logger.debug("Recover: " + x), //
  77                 throwable -> onError(ric, throwable), //
  78                 () -> onComplete(ric));
  79     }
  80
  81     private void onComplete(Ric ric) {
  82         logger.debug("Recovery completed for:" + ric.name());
  83         ric.setState(Ric.RicState.ACTIVE);
  84
  85     }
  86
  87     private void onError(Ric ric, Throwable t) {
  88         logger.debug("Recovery failed for: {}, reason: {}", ric.name(), t.getMessage());
  89         ric.setState(Ric.RicState.NOT_REACHABLE);
  90     }
  91
  92     private Flux<PolicyType> recoverPolicyTypes(Ric ric) {
  93         ric.clearSupportedPolicyTypes();
  94         return a1Client.getPolicyTypeIdentities(ric.getConfig().baseUrl()) //
  95             .flatMapMany(types -> Flux.fromIterable(types)) //
  96             .doOnNext(typeId -> logger.debug("For ric: {}, handling type: {}", ric.getConfig().name(), typeId))
  97             .flatMap((policyTypeId) -> getPolicyType(ric, policyTypeId)) //
  98             .doOnNext(policyType -> ric.addSupportedPolicyType(policyType)); //
  99     }
 100
 101     private Mono<PolicyType> getPolicyType(Ric ric, String policyTypeId) {
 102         if (policyTypes.contains(policyTypeId)) {
 103             try {
 104                 return Mono.just(policyTypes.getType(policyTypeId));
 105             } catch (ServiceException e) {
 106                 return Mono.error(e);
 107             }
 108         }
 109         return a1Client.getPolicyType(ric.getConfig().baseUrl(), policyTypeId) //
 110             .flatMap(schema -> createPolicyType(policyTypeId, schema));
 111     }
 112
 113     private Mono<PolicyType> createPolicyType(String policyTypeId, String schema) {
 114         PolicyType pt = ImmutablePolicyType.builder().name(policyTypeId).schema(schema).build();
 115         policyTypes.put(pt);
 116         return Mono.just(pt);
 117     }
 118
 119     private Flux<String> deletePolicies(Ric ric) {
 120         Collection<Policy> ricPolicies = new Vector<>(policies.getForRic(ric.name()));
 121         for (Policy policy : ricPolicies) {
 122             this.policies.remove(policy);
 123         }
 124
 125         return a1Client.getPolicyIdentities(ric.getConfig().baseUrl()) //
 126             .flatMapMany(policyIds -> Flux.fromIterable(policyIds)) //
 127             .doOnNext(policyId -> logger.debug("Deleting policy: {}, for ric: {}", policyId, ric.getConfig().name()))
 128             .flatMap(policyId -> a1Client.deletePolicy(ric.getConfig().baseUrl(), policyId)); //
 129     }
 130 }