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/*
* ===============================LICENSE_START======================================
* dcae-analytics
* ================================================================================
* Copyright © 2017 AT&T Intellectual Property. 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.openecomp.dcae.apod.analytics.dmaap.service.subscriber;
import com.google.common.base.Optional;
import com.google.inject.Inject;
import com.google.inject.assistedinject.Assisted;
import org.apache.commons.lang3.tuple.Pair;
import org.apache.http.HttpHeaders;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.openecomp.dcae.apod.analytics.common.exception.DCAEAnalyticsRuntimeException;
import org.openecomp.dcae.apod.analytics.dmaap.domain.config.DMaaPMRSubscriberConfig;
import org.openecomp.dcae.apod.analytics.dmaap.domain.response.DMaaPMRSubscriberResponse;
import org.openecomp.dcae.apod.analytics.dmaap.service.BaseDMaaPMRComponent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.net.URI;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
import static org.openecomp.dcae.apod.analytics.common.utils.HTTPUtils.isSuccessfulResponseCode;
import static java.lang.String.format;
/**
* Concrete Implementation of {@link DMaaPMRSubscriber} which uses {@link HttpClient}
*
* @author Rajiv Singla . Creation Date: 10/13/2016.
*/
public class DMaaPMRSubscriberImpl extends BaseDMaaPMRComponent implements DMaaPMRSubscriber {
private static final Logger LOG = LoggerFactory.getLogger(DMaaPMRSubscriberImpl.class);
private final DMaaPMRSubscriberConfig subscriberConfig;
private final CloseableHttpClient closeableHttpClient;
private final URI subscriberUri;
private final Date subscriberCreationTime;
@Inject
public DMaaPMRSubscriberImpl(@Assisted DMaaPMRSubscriberConfig subscriberConfig,
CloseableHttpClient closeableHttpClient) {
this.subscriberConfig = subscriberConfig;
this.closeableHttpClient = closeableHttpClient;
this.subscriberUri = createSubscriberURI(subscriberConfig);
this.subscriberCreationTime = new Date();
}
@Override
public DMaaPMRSubscriberResponse fetchMessages() {
final String userName = subscriberConfig.getUserName();
final String userPassword = subscriberConfig.getUserPassword();
final HttpGet getRequest = new HttpGet(subscriberUri);
// add Authorization Header if username and password are present
final Optional<String> authHeader = getAuthHeader(userName, userPassword);
if (authHeader.isPresent()) {
getRequest.addHeader(HttpHeaders.AUTHORIZATION, authHeader.get());
} else {
LOG.debug("DMaaP MR Subscriber Authentication is disabled as username or password is not present.");
}
try {
final Pair<Integer, String> responsePair = closeableHttpClient.execute(getRequest, responseHandler());
final Integer responseCode = responsePair.getLeft();
final String responseBody = responsePair.getRight();
List<String> fetchedMessages = new LinkedList<>();
String responseMessage = responseBody;
// if messages were published successfully, return successful response
if (isSuccessfulResponseCode(responseCode)) {
if (responseBody != null) {
fetchedMessages = convertJsonToStringMessages(responseBody);
responseMessage = "Messages Fetched Successfully";
} else {
responseMessage = "DMaaP Response Body had no messages";
}
} else {
LOG.error("Unable to fetch messages to DMaaP MR Topic. DMaaP MR unsuccessful Response Code: {}, " +
"DMaaP Response Body: {}", responseCode, responseBody);
}
return createSubscriberResponse(responseCode, responseMessage, fetchedMessages);
} catch (IOException e) {
final String errorMessage =
format("IO Exception while fetching messages from DMaaP Topic. Exception %s", e);
throw new DCAEAnalyticsRuntimeException(errorMessage, LOG, e);
}
}
@Override
public Date getSubscriberCreationTime() {
return new Date(subscriberCreationTime.getTime());
}
@Override
public void close() throws Exception {
closeableHttpClient.close();
}
}
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