policy-agent/src/main/java/org/oransc/policyagent/tasks/StartupService.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.A1Client;
  24 import org.oransc.policyagent.configuration.ApplicationConfig;
  25 import org.oransc.policyagent.exceptions.ServiceException;
  26 import org.oransc.policyagent.repository.ImmutablePolicyType;
  27 import org.oransc.policyagent.repository.PolicyType;
  28 import org.oransc.policyagent.repository.PolicyTypes;
  29 import org.oransc.policyagent.repository.Ric;
  30 import org.oransc.policyagent.repository.Ric.RicState;
  31 import org.oransc.policyagent.repository.Rics;
  32 import org.slf4j.Logger;
  33 import org.slf4j.LoggerFactory;
  34 import org.springframework.beans.factory.annotation.Autowired;
  35 import org.springframework.stereotype.Service;
  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 @Service("startupService")
  44 public class StartupService {
  45
  46     private static final Logger logger = LoggerFactory.getLogger(StartupService.class);
  47
  48     @Autowired
  49     ApplicationConfig applicationConfig;
  50
  51     @Autowired
  52     private Rics rics;
  53
  54     @Autowired
  55     PolicyTypes policyTypes;
  56
  57     @Autowired
  58     private A1Client a1Client;
  59
  60     StartupService(ApplicationConfig appConfig, Rics rics, PolicyTypes policyTypes, A1Client a1Client) {
  61         this.applicationConfig = appConfig;
  62         this.rics = rics;
  63         this.policyTypes = policyTypes;
  64         this.a1Client = a1Client;
  65     }
  66
  67     /**
  68      * Reads the configured Rics and performs the service discovery. The result is put into the repository.
  69      */
  70     public void startup() {
  71         applicationConfig.initialize();
  72         Flux.fromIterable(applicationConfig.getRicConfigs()) //
  73             .map(ricConfig -> new Ric(ricConfig)) //
  74             .doOnNext(ric -> logger.debug("Handling ric: {}", ric.getConfig().name())) //
  75             .flatMap(this::addPolicyTypesForRic) //
  76             .flatMap(this::deletePoliciesForRic) //
  77             .doOnNext(rics::put) //
  78             .subscribe();
  79     }
  80
  81     private Mono<Ric> addPolicyTypesForRic(Ric ric) {
  82         a1Client.getPolicyTypeIdentities(ric.getConfig().baseUrl()) //
  83             .doOnNext(typeId -> logger.debug("For ric: {}, handling type: {}", ric.getConfig().name(), typeId))
  84             .flatMap((policyTypeId) -> addTypeToRepo(ric, policyTypeId)) //
  85             .flatMap(type -> addTypeToRic(ric, type)) //
  86             .subscribe(null, cause -> setRicToNotReachable(ric, cause), () -> setRicToActive(ric));
  87         return Mono.just(ric);
  88     }
  89
  90     private Mono<PolicyType> addTypeToRepo(Ric ric, String policyTypeId) {
  91         if (policyTypes.contains(policyTypeId)) {
  92             try {
  93                 return Mono.just(policyTypes.getType(policyTypeId));
  94             } catch (ServiceException e) {
  95                 return Mono.error(e);
  96             }
  97         }
  98         return a1Client.getPolicyType(ric.getConfig().baseUrl(), policyTypeId) //
  99             .flatMap(schema -> createPolicyType(policyTypeId, schema));
 100     }
 101
 102     private Mono<PolicyType> createPolicyType(String policyTypeId, String schema) {
 103         PolicyType pt = ImmutablePolicyType.builder().name(policyTypeId).schema(schema).build();
 104         policyTypes.put(pt);
 105         return Mono.just(pt);
 106     }
 107
 108     private Mono<PolicyType> addTypeToRic(Ric ric, PolicyType policyType) {
 109         ric.addSupportedPolicyType(policyType);
 110         return Mono.just(policyType);
 111     }
 112
 113     private Mono<Ric> deletePoliciesForRic(Ric ric) {
 114         if (!Ric.RicState.NOT_REACHABLE.equals(ric.state())) {
 115             a1Client.getPolicyIdentities(ric.getConfig().baseUrl()) //
 116                 .doOnNext(
 117                     policyId -> logger.debug("Deleting policy: {}, for ric: {}", policyId, ric.getConfig().name()))
 118                 .flatMap(policyId -> a1Client.deletePolicy(ric.getConfig().baseUrl(), policyId)) //
 119                 .subscribe(null, cause -> setRicToNotReachable(ric, cause), null);
 120         }
 121
 122         return Mono.just(ric);
 123     }
 124
 125     private void setRicToNotReachable(Ric ric, Throwable t) {
 126         ric.setState(Ric.RicState.NOT_REACHABLE);
 127         logger.info("Unable to connect to ric {}. Cause: {}", ric.name(), t.getMessage());
 128     }
 129
 130     private void setRicToActive(Ric ric) {
 131         ric.setState(RicState.ACTIVE);
 132     }
 133
 134 }