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/*-
* ========================LICENSE_START=================================
* ONAP : ccsdk oran
* ======================================================================
* Copyright (C) 2019-2020 Nordix Foundation. All rights reserved.
* ======================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ========================LICENSE_END===================================
*/
package org.onap.ccsdk.oran.a1policymanagementservice.tasks;
import java.time.Duration;
import org.onap.ccsdk.oran.a1policymanagementservice.clients.A1ClientFactory;
import org.onap.ccsdk.oran.a1policymanagementservice.repository.Lock;
import org.onap.ccsdk.oran.a1policymanagementservice.repository.Lock.LockType;
import org.onap.ccsdk.oran.a1policymanagementservice.repository.Policies;
import org.onap.ccsdk.oran.a1policymanagementservice.repository.Policy;
import org.onap.ccsdk.oran.a1policymanagementservice.repository.Service;
import org.onap.ccsdk.oran.a1policymanagementservice.repository.Services;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.stereotype.Component;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
/**
* Periodically checks that services with a keepAliveInterval set are alive. If
* a service is deemed not alive, all the service's policies are deleted, both
* in the repository and in the affected Rics, and the service is removed from
* the repository. This means that the service needs to register again after
* this.
*/
@Component
@EnableScheduling
@SuppressWarnings("squid:S2629") // Invoke method(s) only conditionally
public class ServiceSupervision {
private static final Logger logger = LoggerFactory.getLogger(ServiceSupervision.class);
static final int CONCURRENCY_RIC = 1; // How may paralell requests that is sent
private final Services services;
private final Policies policies;
private A1ClientFactory a1ClientFactory;
private final Duration checkInterval;
@Autowired
public ServiceSupervision(Services services, Policies policies, A1ClientFactory a1ClientFactory) {
this(services, policies, a1ClientFactory, Duration.ofMinutes(1));
}
public ServiceSupervision(Services services, Policies policies, A1ClientFactory a1ClientFactory,
Duration checkInterval) {
this.services = services;
this.policies = policies;
this.a1ClientFactory = a1ClientFactory;
this.checkInterval = checkInterval;
start();
}
private void start() {
logger.debug("Checking services starting");
createTask().subscribe(null, null, () -> logger.error("Checking services unexpectedly terminated"));
}
private Flux<?> createTask() {
return Flux.interval(this.checkInterval) //
.flatMap(notUsed -> checkAllServices());
}
Flux<Policy> checkAllServices() {
return Flux.fromIterable(services.getAll()) //
.filter(Service::isExpired) //
.doOnNext(service -> logger.info("Service is expired: {}", service.getName())) //
.doOnNext(service -> services.remove(service.getName())) //
.flatMap(this::getAllPoliciesForService) //
.flatMap(this::deletePolicy, CONCURRENCY_RIC);
}
@SuppressWarnings("squid:S2629") // Invoke method(s) only conditionally
private Flux<Policy> deletePolicy(Policy policy) {
Lock lock = policy.getRic().getLock();
return lock.lock(LockType.SHARED) //
.doOnNext(notUsed -> policies.remove(policy)) //
.flatMap(notUsed -> deletePolicyInRic(policy))
.doOnNext(notUsed -> logger.debug("Policy deleted due to service inactivity: {}, service: {}",
policy.getId(), policy.getOwnerServiceId())) //
.doOnNext(notUsed -> lock.unlockBlocking()) //
.doOnError(throwable -> lock.unlockBlocking()) //
.doOnError(throwable -> logger.debug("Failed to delete inactive policy: {}, reason: {}", policy.getId(),
throwable.getMessage())) //
.flatMapMany(notUsed -> Flux.just(policy)) //
.onErrorResume(throwable -> Flux.empty());
}
private Flux<Policy> getAllPoliciesForService(Service service) {
return Flux.fromIterable(policies.getForService(service.getName()));
}
private Mono<Policy> deletePolicyInRic(Policy policy) {
return a1ClientFactory.createA1Client(policy.getRic()) //
.flatMap(client -> client.deletePolicy(policy) //
.onErrorResume(exception -> handleDeleteFromRicFailure(policy, exception)) //
.map(nothing -> policy));
}
private Mono<String> handleDeleteFromRicFailure(Policy policy, Throwable e) {
logger.warn("Could not delete policy: {} from ric: {}. Cause: {}", policy.getId(), policy.getRic().id(),
e.getMessage());
return Mono.empty();
}
}
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