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/*-
* ============LICENSE_START=======================================================
* org.onap.dcaegen2.collectors.ves
* ================================================================================
* Copyright (C) 2018 Nokia. 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.dcae.common.publishing;
import io.vavr.collection.List;
import io.vavr.collection.Map;
import io.vavr.control.Option;
import io.vavr.control.Try;
import org.onap.dcae.common.AnyNode;
import java.net.URL;
import java.nio.file.Files;
import java.nio.file.Path;
import org.json.JSONObject;
import static io.vavr.API.*;
import static org.onap.dcae.common.publishing.VavrUtils.enhanceError;
import static org.onap.dcae.common.publishing.VavrUtils.f;
/**
* @author Pawel Szalapski (pawel.szalapski@nokia.com)
*/
@SuppressWarnings("mapFailure takes a generic varargs, unchecked because of Javas type system limitation, actually safe to do")
public final class DMaaPConfigurationParser {
public static Try<Map<String, PublisherConfig>> parseToDomainMapping(Path configLocation) {
return readFromFile(configLocation)
.flatMap(DMaaPConfigurationParser::toJSON)
.flatMap(DMaaPConfigurationParser::toConfigMap);
}
public static Try<Map<String, PublisherConfig>> parseToDomainMapping(JSONObject config) {
return toJSON(config.toString())
.flatMap(DMaaPConfigurationParser::toConfigMap);
}
private static Try<String> readFromFile(Path configLocation) {
return Try(() -> new String(Files.readAllBytes(configLocation)))
.mapFailure(enhanceError(f("Could not read DMaaP configuration from location: '%s'", configLocation)));
}
private static Try<AnyNode> toJSON(String config) {
return Try(() -> AnyNode.fromString(config))
.mapFailure(enhanceError(f("DMaaP configuration '%s' is not a valid JSON document", config)));
}
private static Try<Map<String, PublisherConfig>> toConfigMap(AnyNode config) {
return Try(() -> usesLegacyFormat(config) ? parseLegacyFormat(config) : parseNewFormat(config))
.mapFailure(enhanceError(f("Parsing DMaaP configuration: '%s' failed, probably it is in unexpected format", config)));
}
private static boolean usesLegacyFormat(AnyNode dMaaPConfig) {
return dMaaPConfig.has("channels");
}
private static Map<String, PublisherConfig> parseLegacyFormat(AnyNode root) {
return root.get("channels").toList().toMap(
channel -> channel.get("name").toString(),
channel -> {
String destinationsStr = channel.getAsOption("cambria.url")
.getOrElse(channel.getAsOption("cambria.hosts").get())
.toString();
String topic = channel.get("cambria.topic").toString();
Option<String> maybeUser = channel.getAsOption("basicAuthUsername").map(AnyNode::toString);
Option<String> maybePassword = channel.getAsOption("basicAuthPassword").map(AnyNode::toString);
List<String> destinations = List(destinationsStr.split(","));
return buildBasedOnAuth(maybeUser, maybePassword, topic, destinations);
});
}
private static Map<String, PublisherConfig> parseNewFormat(AnyNode root) {
return root.keys().toMap(
channelName -> channelName,
channelName -> {
AnyNode channelConfig = root.get(channelName);
Option<String> maybeUser = channelConfig.getAsOption("aaf_username").map(AnyNode::toString);
Option<String> maybePassword = channelConfig.getAsOption("aaf_password").map(AnyNode::toString);
URL topicURL = unchecked(
() -> new URL(channelConfig.get("dmaap_info").get("topic_url").toString())).apply();
String[] pathSegments = topicURL.getPath().substring(1).split("/");
String topic = pathSegments[1];
String destination = "events".equals(pathSegments[0]) ? topicURL.getAuthority() : topicURL.getHost();
List<String> destinations = List(destination);
return buildBasedOnAuth(maybeUser, maybePassword, topic, destinations);
});
}
private static PublisherConfig buildBasedOnAuth(Option<String> maybeUser, Option<String> maybePassword,
String topic, List<String> destinations) {
return maybeUser.flatMap(user -> maybePassword.map(password -> Tuple(user, password)))
.map(credentials -> new PublisherConfig(destinations, topic, credentials._1, credentials._2))
.getOrElse(new PublisherConfig(destinations, topic));
}
}
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