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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019 Nordix Foundation.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.dcaegen2.services.pmmapper.config;
import io.undertow.server.HttpServerExchange;
import io.undertow.util.StatusCodes;
import java.util.List;
import lombok.Data;
import org.onap.dcaegen2.services.pmmapper.exceptions.ReconfigurationException;
import org.onap.dcaegen2.services.pmmapper.model.MapperConfig;
import org.onap.dcaegen2.services.pmmapper.model.ServerResource;
import org.onap.dcaegen2.services.pmmapper.utils.HttpServerExchangeAdapter;
import org.onap.logging.ref.slf4j.ONAPLogAdapter;
import org.slf4j.LoggerFactory;
@Data
public class DynamicConfiguration extends ServerResource {
private static final ONAPLogAdapter logger = new ONAPLogAdapter(LoggerFactory.getLogger(DynamicConfiguration.class));
private static final String RECONFIGURE_ENDPOINT = "/reconfigure";
private List<Configurable> configurables;
private MapperConfig originalConfig;
private ConfigHandler configHandler;
/**
* Creates a Dynamic Configuration object with a list of configurable objects.
* @param configurables list of objects to reconfigure
* @param originalConfig original config to compare against.
*/
public DynamicConfiguration(List<Configurable> configurables, MapperConfig originalConfig) {
super(RECONFIGURE_ENDPOINT);
this.configurables = configurables;
this.originalConfig = originalConfig;
this.configHandler = new ConfigHandler();
}
private void applyConfiguration(MapperConfig updatedConfig) throws ReconfigurationException {
for (Configurable configurable : configurables) {
logger.unwrap().debug("Reconfiguring: {}", configurable);
configurable.reconfigure(updatedConfig);
}
}
/**
* Receives requests to pull the latest configuration from CBS.
* @param httpServerExchange inbound http server exchange.
* @throws Exception
*/
@Override
public void handleRequest(HttpServerExchange httpServerExchange) throws Exception {
try {
logger.entering(new HttpServerExchangeAdapter(httpServerExchange));
boolean reconfigured = reconfigure();
int responseCode = reconfigured? StatusCodes.OK : StatusCodes.INTERNAL_SERVER_ERROR;
String responseMessage = reconfigured ? StatusCodes.OK_STRING : StatusCodes.INTERNAL_SERVER_ERROR_STRING;
httpServerExchange.setStatusCode(responseCode).getResponseSender().send(responseMessage);
} finally {
logger.exiting();
}
}
/**
* @return Boolean to indicate if configuration attempt was successful
* @throws Exception If environment config cannot be read, or if re-applying the original config fails
*/
public boolean reconfigure() throws Exception {
boolean success = true;
MapperConfig config = configHandler.getMapperConfig();
if (!this.originalConfig.equals(config)) {
logger.unwrap().info("Configuration update detected.");
logger.unwrap().info("Reconfiguring configurables");
try {
applyConfiguration(config);
this.originalConfig = config;
} catch (ReconfigurationException e) {
success = false;
logger.unwrap().error("Failed to apply configuration update, reverting to original config", e);
applyConfiguration(this.originalConfig);
}
}
return success;
}
}
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