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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 com.google.gson.JsonObject;
import java.time.Duration;
import java.util.Optional;
import java.util.Properties;
import lombok.AccessLevel;
import lombok.Getter;
import org.onap.ccsdk.oran.a1policymanagementservice.clients.A1ClientFactory;
import org.onap.ccsdk.oran.a1policymanagementservice.clients.AsyncRestClientFactory;
import org.onap.ccsdk.oran.a1policymanagementservice.configuration.ApplicationConfig;
import org.onap.ccsdk.oran.a1policymanagementservice.configuration.ApplicationConfig.RicConfigUpdate;
import org.onap.ccsdk.oran.a1policymanagementservice.configuration.ApplicationConfigParser;
import org.onap.ccsdk.oran.a1policymanagementservice.configuration.ConfigurationFile;
import org.onap.ccsdk.oran.a1policymanagementservice.configuration.RicConfig;
import org.onap.ccsdk.oran.a1policymanagementservice.repository.Policies;
import org.onap.ccsdk.oran.a1policymanagementservice.repository.PolicyTypes;
import org.onap.ccsdk.oran.a1policymanagementservice.repository.Ric;
import org.onap.ccsdk.oran.a1policymanagementservice.repository.Rics;
import org.onap.ccsdk.oran.a1policymanagementservice.repository.Services;
import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.CbsClient;
import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.CbsClientFactory;
import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.CbsRequests;
import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.model.CbsRequest;
import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.model.EnvProperties;
import org.onap.dcaegen2.services.sdk.rest.services.model.logging.RequestDiagnosticContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import reactor.core.Disposable;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import reactor.util.annotation.Nullable;
/**
* Regularly refreshes the configuration from Consul or from a local
* configuration file.
*/
@Component
public class RefreshConfigTask {
private static final Logger logger = LoggerFactory.getLogger(RefreshConfigTask.class);
@Value("#{systemEnvironment}")
public Properties systemEnvironment;
/**
* The time between refreshes of the configuration. Not final so tests can modify it.
*/
private static Duration configRefreshInterval = Duration.ofMinutes(1);
final ConfigurationFile configurationFile;
final ApplicationConfig appConfig;
@Getter(AccessLevel.PROTECTED)
private Disposable refreshTask = null;
private boolean isConsulUsed = false;
private final Rics rics;
private final A1ClientFactory a1ClientFactory;
private final Policies policies;
private final Services services;
private final PolicyTypes policyTypes;
private final AsyncRestClientFactory restClientFactory;
@Autowired
public RefreshConfigTask(ConfigurationFile configurationFile, ApplicationConfig appConfig, Rics rics,
Policies policies, Services services, PolicyTypes policyTypes, A1ClientFactory a1ClientFactory) {
this.configurationFile = configurationFile;
this.appConfig = appConfig;
this.rics = rics;
this.policies = policies;
this.services = services;
this.policyTypes = policyTypes;
this.a1ClientFactory = a1ClientFactory;
this.restClientFactory = new AsyncRestClientFactory(appConfig.getWebClientConfig());
}
public void start() {
logger.debug("Starting refreshConfigTask");
stop();
refreshTask = createRefreshTask() //
.subscribe(
notUsed -> logger.debug("Refreshed configuration data"), throwable -> logger
.error("Configuration refresh terminated due to exception {}", throwable.toString()),
() -> logger.error("Configuration refresh terminated"));
}
public void stop() {
if (refreshTask != null) {
refreshTask.dispose();
}
}
Flux<RicConfigUpdate.Type> createRefreshTask() {
Flux<JsonObject> loadFromFile = Flux.interval(Duration.ZERO, configRefreshInterval) //
.filter(notUsed -> !this.isConsulUsed) //
.flatMap(notUsed -> loadConfigurationFromFile()) //
.onErrorResume(this::ignoreErrorFlux) //
.doOnNext(json -> logger.debug("loadFromFile succeeded")) //
.doOnTerminate(() -> logger.error("loadFromFile Terminate"));
Flux<JsonObject> loadFromConsul = Flux.interval(Duration.ZERO, configRefreshInterval) //
.flatMap(i -> getEnvironment(systemEnvironment)) //
.flatMap(this::createCbsClient) //
.flatMap(this::getFromCbs) //
.onErrorResume(this::ignoreErrorMono) //
.doOnNext(json -> logger.debug("loadFromConsul succeeded")) //
.doOnNext(json -> this.isConsulUsed = true) //
.doOnTerminate(() -> logger.error("loadFromConsul Terminated"));
return Flux.merge(loadFromFile, loadFromConsul) //
.flatMap(this::parseConfiguration) //
.flatMap(this::updateConfig) //
.doOnNext(this::handleUpdatedRicConfig) //
.flatMap(configUpdate -> Flux.just(configUpdate.getType())) //
.doOnTerminate(() -> logger.error("Configuration refresh task is terminated"));
}
Mono<EnvProperties> getEnvironment(Properties systemEnvironment) {
return EnvironmentProcessor.readEnvironmentVariables(systemEnvironment) //
.onErrorResume(t -> Mono.empty());
}
Mono<CbsClient> createCbsClient(EnvProperties env) {
return CbsClientFactory.createCbsClient(env) //
.onErrorResume(this::ignoreErrorMono);
}
private Mono<JsonObject> getFromCbs(CbsClient cbsClient) {
try {
final CbsRequest getConfigRequest = CbsRequests.getAll(RequestDiagnosticContext.create());
return cbsClient.get(getConfigRequest) //
.onErrorResume(this::ignoreErrorMono);
} catch (Exception e) {
return ignoreErrorMono(e);
}
}
private <R> Flux<R> ignoreErrorFlux(Throwable throwable) {
String errMsg = throwable.toString();
logger.warn("Could not refresh application configuration. {}", errMsg);
return Flux.empty();
}
private <R> Mono<R> ignoreErrorMono(Throwable throwable) {
String errMsg = throwable.toString();
logger.warn("Could not refresh application configuration. {}", errMsg);
return Mono.empty();
}
private Mono<ApplicationConfigParser.ConfigParserResult> parseConfiguration(JsonObject jsonObject) {
try {
ApplicationConfigParser parser = new ApplicationConfigParser();
return Mono.just(parser.parse(jsonObject));
} catch (Exception e) {
String str = e.toString();
logger.error("Could not parse configuration {}", str);
return Mono.empty();
}
}
private Flux<RicConfigUpdate> updateConfig(ApplicationConfigParser.ConfigParserResult config) {
return this.appConfig.setConfiguration(config);
}
private void removePoliciciesInRic(@Nullable Ric ric) {
if (ric != null) {
RicSynchronizationTask synch = new RicSynchronizationTask(a1ClientFactory, policyTypes, policies, services,
restClientFactory, rics);
synch.run(ric);
}
}
private void handleUpdatedRicConfig(RicConfigUpdate updatedInfo) {
synchronized (this.rics) {
String ricId = updatedInfo.getRicConfig().ricId();
RicConfigUpdate.Type event = updatedInfo.getType();
if (event == RicConfigUpdate.Type.ADDED) {
logger.debug("RIC added {}", ricId);
addRic(updatedInfo.getRicConfig());
} else if (event == RicConfigUpdate.Type.REMOVED) {
logger.debug("RIC removed {}", ricId);
Ric ric = rics.remove(ricId);
this.policies.removePoliciesForRic(ricId);
removePoliciciesInRic(ric);
} else if (event == RicConfigUpdate.Type.CHANGED) {
logger.debug("RIC config updated {}", ricId);
Ric ric = this.rics.get(ricId);
if (ric == null) {
logger.error("An non existing RIC config is changed, should not happen (just for robustness)");
addRic(updatedInfo.getRicConfig());
} else {
ric.setRicConfig(updatedInfo.getRicConfig());
}
}
}
}
private void addRic(RicConfig config) {
Ric ric = new Ric(config);
this.rics.put(ric);
runRicSynchronization(ric);
}
void runRicSynchronization(Ric ric) {
RicSynchronizationTask synchronizationTask =
new RicSynchronizationTask(a1ClientFactory, policyTypes, policies, services, restClientFactory, rics);
synchronizationTask.run(ric);
}
/**
* Reads the configuration from file.
*/
Flux<JsonObject> loadConfigurationFromFile() {
Optional<JsonObject> readJson = configurationFile.readFile();
if (readJson.isPresent()) {
return Flux.just(readJson.get());
}
return Flux.empty();
}
}
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