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.clients.AsyncRestClient;
  28 import org.oransc.policyagent.exceptions.ServiceException;
  29 import org.oransc.policyagent.repository.ImmutablePolicyType;
  30 import org.oransc.policyagent.repository.Policies;
  31 import org.oransc.policyagent.repository.Policy;
  32 import org.oransc.policyagent.repository.PolicyType;
  33 import org.oransc.policyagent.repository.PolicyTypes;
  34 import org.oransc.policyagent.repository.Ric;
  35 import org.oransc.policyagent.repository.Service;
  36 import org.oransc.policyagent.repository.Services;
  37 import org.slf4j.Logger;
  38 import org.slf4j.LoggerFactory;
  39
  40 import reactor.core.publisher.Flux;
  41 import reactor.core.publisher.Mono;
  42
  43 /**
  44  * Loads information about RealTime-RICs at startup.
  45  */
  46 public class RicRecoveryTask {
  47
  48     private static final Logger logger = LoggerFactory.getLogger(RicRecoveryTask.class);
  49
  50     private final A1Client a1Client;
  51     private final PolicyTypes policyTypes;
  52     private final Policies policies;
  53     private final Services services;
  54
  55     public RicRecoveryTask(A1Client a1Client, PolicyTypes policyTypes, Policies policies, Services services) {
  56         this.a1Client = a1Client;
  57         this.policyTypes = policyTypes;
  58         this.policies = policies;
  59         this.services = services;
  60     }
  61
  62     public void run(Collection<Ric> rics) {
  63         for (Ric ric : rics) {
  64             run(ric);
  65         }
  66     }
  67
  68     public void run(Ric ric) {
  69         logger.debug("Handling ric: {}", ric.getConfig().name());
  70
  71         synchronized (ric) {
  72             if (ric.state().equals(Ric.RicState.RECOVERING)) {
  73                 return; // Already running
  74             }
  75             ric.setState(Ric.RicState.RECOVERING);
  76         }
  77         Flux<PolicyType> recoveredTypes = recoverPolicyTypes(ric);
  78         Flux<?> deletedPolicies = deletePolicies(ric);
  79
  80         Flux.merge(recoveredTypes, deletedPolicies) //
  81             .subscribe(x -> logger.debug("Recover: " + x), //
  82                 throwable -> onError(ric, throwable), //
  83                 () -> onComplete(ric));
  84     }
  85
  86     private void onComplete(Ric ric) {
  87         logger.debug("Recovery completed for:" + ric.name());
  88         ric.setState(Ric.RicState.ACTIVE);
  89         notifyAllServices("Recovery completed for:" + ric.name());
  90     }
  91
  92     private void notifyAllServices(String body) {
  93         for (Service service : services.getAll()) {
  94             String url = service.getCallbackUrl();
  95             if (service.getCallbackUrl().length() > 0) {
  96                 createClient(url) //
  97                     .put("", body) //
  98                     .subscribe(rsp -> logger.debug("Service called"),
  99                         throwable -> logger.warn("Service called failed", throwable),
 100                         () -> logger.debug("Service called complete"));
 101             }
 102         }
 103     }
 104
 105     private void onError(Ric ric, Throwable t) {
 106         logger.warn("Recovery failed for: {}, reason: {}", ric.name(), t.getMessage());
 107         ric.setState(Ric.RicState.NOT_REACHABLE);
 108     }
 109
 110     private AsyncRestClient createClient(final String url) {
 111         return new AsyncRestClient(url);
 112     }
 113
 114     private Flux<PolicyType> recoverPolicyTypes(Ric ric) {
 115         ric.clearSupportedPolicyTypes();
 116         return a1Client.getPolicyTypeIdentities(ric.getConfig().baseUrl()) //
 117             .flatMapMany(types -> Flux.fromIterable(types)) //
 118             .doOnNext(typeId -> logger.debug("For ric: {}, handling type: {}", ric.getConfig().name(), typeId))
 119             .flatMap((policyTypeId) -> getPolicyType(ric, policyTypeId)) //
 120             .doOnNext(policyType -> ric.addSupportedPolicyType(policyType)); //
 121     }
 122
 123     private Mono<PolicyType> getPolicyType(Ric ric, String policyTypeId) {
 124         if (policyTypes.contains(policyTypeId)) {
 125             try {
 126                 return Mono.just(policyTypes.getType(policyTypeId));
 127             } catch (ServiceException e) {
 128                 return Mono.error(e);
 129             }
 130         }
 131         return a1Client.getPolicyType(ric.getConfig().baseUrl(), policyTypeId) //
 132             .flatMap(schema -> createPolicyType(policyTypeId, schema));
 133     }
 134
 135     private Mono<PolicyType> createPolicyType(String policyTypeId, String schema) {
 136         PolicyType pt = ImmutablePolicyType.builder().name(policyTypeId).schema(schema).build();
 137         policyTypes.put(pt);
 138         return Mono.just(pt);
 139     }
 140
 141     private Flux<String> deletePolicies(Ric ric) {
 142         Collection<Policy> ricPolicies = new Vector<>(policies.getForRic(ric.name()));
 143         for (Policy policy : ricPolicies) {
 144             this.policies.remove(policy);
 145         }
 146
 147         return a1Client.getPolicyIdentities(ric.getConfig().baseUrl()) //
 148             .flatMapMany(policyIds -> Flux.fromIterable(policyIds)) //
 149             .doOnNext(policyId -> logger.debug("Deleting policy: {}, for ric: {}", policyId, ric.getConfig().name()))
 150             .flatMap(policyId -> a1Client.deletePolicy(ric.getConfig().baseUrl(), policyId)); //
 151     }
 152 }