gerrit.onap Code Review - dcaegen2/services/mapper.git/blob

   1 /*
   2  * ===============================LICENSE_START======================================
   3  *  dcae-analytics
   4  * ================================================================================
   5  *    Copyright © 2017 AT&T Intellectual Property. All rights reserved.
   6  * ================================================================================
   7  *  Licensed under the Apache License, Version 2.0 (the "License");
   8  *  you may not use this file except in compliance with the License.
   9  *   You may obtain a copy of the License at
  10  *
  11  *          http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  *  Unless required by applicable law or agreed to in writing, software
  14  *  distributed under the License is distributed on an "AS IS" BASIS,
  15  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  *  See the License for the specific language governing permissions and
  17  *  limitations under the License.
  18  *  ============================LICENSE_END===========================================
  19  */
  20
  21 package org.onap.universalvesadapter.dmaap.MRSubcriber;
  22
  23 import com.google.common.base.Optional;
  24 import com.google.inject.Inject;
  25 import com.google.inject.assistedinject.Assisted;
  26 import org.apache.commons.lang3.tuple.Pair;
  27 import org.apache.http.HttpHeaders;
  28 import org.apache.http.client.HttpClient;
  29 import org.apache.http.client.methods.HttpGet;
  30 import org.apache.http.impl.client.CloseableHttpClient;
  31 import org.onap.universalvesadapter.configs.DMaaPMRSubscriberConfig;
  32 import org.onap.universalvesadapter.dmaap.BaseDMaaPMRComponent;
  33 import org.onap.universalvesadapter.exception.DMaapException;
  34 import org.onap.universalvesadapter.utils.HTTPUtils;
  35 import org.slf4j.Logger;
  36 import org.slf4j.LoggerFactory;
  37
  38 import java.io.IOException;
  39 import java.net.URI;
  40 import java.util.Date;
  41 import java.util.LinkedList;
  42 import java.util.List;
  43
  44 import static java.lang.String.format;
  45
  46 /**
  47  * Concrete Implementation of {@link DMaaPMRSubscriber} which uses
  48  * {@link HttpClient}
  49  *
  50  * @author Rajiv Singla . Creation Date: 10/13/2016.
  51  */
  52 public class DMaaPMRSubscriberImpl extends BaseDMaaPMRComponent implements DMaaPMRSubscriber {
  53
  54         private static final Logger LOG = LoggerFactory.getLogger(DMaaPMRSubscriberImpl.class);
  55
  56         private final DMaaPMRSubscriberConfig subscriberConfig;
  57         private final CloseableHttpClient closeableHttpClient;
  58         private final URI subscriberUri;
  59         private final Date subscriberCreationTime;
  60
  61         @Inject
  62         public DMaaPMRSubscriberImpl(@Assisted DMaaPMRSubscriberConfig subscriberConfig,
  63                         CloseableHttpClient closeableHttpClient) {
  64                 this.subscriberConfig = subscriberConfig;
  65                 this.closeableHttpClient = closeableHttpClient;
  66                 this.subscriberUri = createSubscriberURI(subscriberConfig);
  67                 this.subscriberCreationTime = new Date();
  68         }
  69
  70         @Override
  71         public DMaaPMRSubscriberResponse fetchMessages() {
  72
  73                 final String userName = (subscriberConfig.getUserName().equals("null")) ? null : subscriberConfig.getUserName();
  74                 final String userPassword = (subscriberConfig.getUserPassword().equals("null")) ? null
  75                                 : subscriberConfig.getUserPassword();
  76                 final HttpGet getRequest = new HttpGet(subscriberUri);
  77
  78                 // add Authorization Header if username and password are present
  79                 final Optional<String> authHeader = getAuthHeader(userName, userPassword);
  80                 if (authHeader.isPresent()) {
  81                         getRequest.addHeader(HttpHeaders.AUTHORIZATION, authHeader.get());
  82                 } else {
  83                         LOG.debug("DMaaP MR Subscriber Authentication is disabled as username or password is not present.");
  84                 }
  85
  86                 try {
  87
  88                         final Pair<Integer, String> responsePair = closeableHttpClient.execute(getRequest, responseHandler());
  89                         final Integer responseCode = responsePair.getLeft();
  90                         final String responseBody = responsePair.getRight();
  91
  92                         List<String> fetchedMessages = new LinkedList<>();
  93                         String responseMessage = responseBody;
  94
  95                         // if messages were published successfully, return successful response
  96                         if (HTTPUtils.isSuccessfulResponseCode(responseCode)) {
  97                                 if (responseBody != null) {
  98                                         fetchedMessages = convertJsonToStringMessages(responseBody);
  99                                         responseMessage = "Messages Fetched Successfully";
 100                                 } else {
 101                                         responseMessage = "DMaaP Response Body had no messages";
 102                                 }
 103                         } else {
 104                                 LOG.error("Unable to fetch messages to DMaaP MR Topic. DMaaP MR unsuccessful Response Code: {}, "
 105                                                 + "DMaaP Response Body: {}", responseCode, responseBody);
 106                         }
 107
 108                         return createSubscriberResponse(responseCode, responseMessage, fetchedMessages);
 109
 110                 } catch (IOException e) {
 111
 112                         final String errorMessage = format("IO Exception while fetching messages from DMaaP Topic. Exception %s",
 113                                         e);
 114                         throw new DMaapException(errorMessage, LOG, e);
 115                 }
 116
 117         }
 118
 119         @Override
 120         public Date getSubscriberCreationTime() {
 121                 return new Date(subscriberCreationTime.getTime());
 122         }
 123
 124         @Override
 125         public void close() throws Exception {
 126                 closeableHttpClient.close();
 127         }
 128 }