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/*
* ============LICENSE_START=======================================================
* VES Collector
* ================================================================================
* Copyright (C) 2020 Nokia. All rights reserved.s
* ================================================================================
* 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.dcae.configuration;
import com.google.gson.JsonObject;
import io.vavr.control.Option;
import org.json.JSONObject;
import org.onap.dcae.configuration.cbs.CbsClientConfigurationProvider;
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.CbsClientConfiguration;
import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.model.CbsRequest;
import org.onap.dcaegen2.services.sdk.rest.services.model.logging.RequestDiagnosticContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import reactor.core.Disposable;
import reactor.core.publisher.Mono;
import java.time.Duration;
/**
* ConfigurationHandler is responsible for receiving configuration updates from Consul.
* Any change made in the Consul will be reported as a notification.
*/
public class ConfigurationHandler {
private static Logger log = LoggerFactory.getLogger(ConfigurationHandler.class);
private static final String CONFIG_DICT = "config";
private final CbsClientConfigurationProvider cbsClientConfigurationProvider;
private final ConfigUpdater configUpdater;
/**
* Constructor
* @param cbsClientConfigurationProvider provides configuration to connect with Consul
* @param configUpdater for updating application configuration
*/
public ConfigurationHandler(CbsClientConfigurationProvider cbsClientConfigurationProvider, ConfigUpdater configUpdater) {
this.cbsClientConfigurationProvider = cbsClientConfigurationProvider;
this.configUpdater = configUpdater;
}
/**
* Start listen for application configuration notifications with configuration changes
* @param interval defines period of time when notification can come
* @return {@link Disposable} handler to close Consul listener at the end
*/
public Disposable startListen(Duration interval) {
log.info("Start listening for configuration from Consul ...");
log.info(String.format("Consul configuration will be fetched in %s period.", interval));
// Polling properties
final Duration initialDelay = Duration.ofSeconds(5);
final Duration period = interval;
final CbsRequest request = createCbsRequest();
final CbsClientConfiguration cbsClientConfiguration = cbsClientConfigurationProvider.get();
return createCbsClient(cbsClientConfiguration)
.flatMapMany(cbsClient -> cbsClient.updates(request, initialDelay, period))
.subscribe(
this::handleConfigurationFromConsul,
this::handleError
);
}
Mono<CbsClient> createCbsClient(CbsClientConfiguration cbsClientConfiguration) {
return CbsClientFactory.createCbsClient(cbsClientConfiguration);
}
void handleConfigurationFromConsul(JsonObject jsonObject) {
log.info("Configuration update from Consul {}", jsonObject);
if(jsonObject.has(CONFIG_DICT)) {
JsonObject config = jsonObject.getAsJsonObject(CONFIG_DICT);
JSONObject jObject = new JSONObject(config.toString());
configUpdater.updateConfig(Option.of(jObject));
} else {
throw new IllegalArgumentException(String.format("Invalid application configuration: %s ", jsonObject));
}
}
private void handleError(Throwable throwable) {
log.error("Unexpected error occurred during fetching configuration from Consul", throwable);
}
private CbsRequest createCbsRequest() {
RequestDiagnosticContext diagnosticContext = RequestDiagnosticContext.create();
return CbsRequests.getAll(diagnosticContext);
}
}
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