src/main/java/com/att/nsa/cambria/beans/DMaaPKafkaMetaBroker.java

   1 /*******************************************************************************
   2  *  ============LICENSE_START=======================================================
   3  *  org.onap.dmaap
   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  *        http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  *  Unless required by applicable law or agreed to in writing, software
  13  *  distributed under the License is distributed on an "AS IS" BASIS,
  14  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  *  See the License for the specific language governing permissions and
  16  *  limitations under the License.
  17  *  ============LICENSE_END=========================================================
  18  *
  19  *  ECOMP is a trademark and service mark of AT&T Intellectual Property.
  20  *
  21  *******************************************************************************/
  22 package com.att.nsa.cambria.beans;
  23
  24 import java.util.LinkedList;
  25 import java.util.List;
  26 import java.util.Properties;
  27 import java.util.Set;
  28 import java.util.TreeSet;
  29
  30 import org.I0Itec.zkclient.ZkClient;
  31 import org.I0Itec.zkclient.exception.ZkNoNodeException;
  32 //import org.apache.log4-j.Logger;
  33 import com.att.eelf.configuration.EELFLogger;
  34 import com.att.eelf.configuration.EELFManager;
  35
  36 import org.json.JSONArray;
  37 import org.json.JSONObject;
  38 import org.springframework.beans.factory.annotation.Qualifier;
  39
  40 import com.att.nsa.cambria.CambriaApiException;
  41 import com.att.nsa.cambria.metabroker.Broker;
  42 import com.att.nsa.cambria.metabroker.Topic;
  43 import com.att.nsa.cambria.utils.ConfigurationReader;
  44 import com.att.nsa.configs.ConfigDb;
  45 import com.att.nsa.configs.ConfigDbException;
  46 import com.att.nsa.configs.ConfigPath;
  47 import com.att.nsa.drumlin.service.standards.HttpStatusCodes;
  48 import com.att.nsa.drumlin.till.nv.rrNvReadable;
  49 import com.att.nsa.security.NsaAcl;
  50 import com.att.nsa.security.NsaAclUtils;
  51 import com.att.nsa.security.NsaApiKey;
  52
  53 import kafka.admin.AdminUtils;
  54 import kafka.utils.ZKStringSerializer$;
  55
  56 /**
  57  * class performing all topic operations
  58  *
  59  * @author author
  60  *
  61  */
  62
  63 public class DMaaPKafkaMetaBroker implements Broker {
  64
  65         //private static final Logger log = Logger.getLogger(DMaaPKafkaMetaBroker.class);
  66         private static final EELFLogger log = EELFManager.getInstance().getLogger(ConfigurationReader.class);
  67
  68
  69         /**
  70          * DMaaPKafkaMetaBroker constructor initializing
  71          *
  72          * @param settings
  73          * @param zk
  74          * @param configDb
  75          */
  76         public DMaaPKafkaMetaBroker(@Qualifier("propertyReader") rrNvReadable settings,
  77                         @Qualifier("dMaaPZkClient") ZkClient zk, @Qualifier("dMaaPZkConfigDb") ConfigDb configDb) {
  78                 //fSettings = settings;
  79                 fZk = zk;
  80                 fCambriaConfig = configDb;
  81                 fBaseTopicData = configDb.parse("/topics");
  82         }
  83
  84         @Override
  85         public List<Topic> getAllTopics() throws ConfigDbException {
  86                 log.info("Retrieving list of all the topics.");
  87                 final LinkedList<Topic> result = new LinkedList<Topic>();
  88                 try {
  89                         log.info("Retrieving all topics from root: " + zkTopicsRoot);
  90                         final List<String> topics = fZk.getChildren(zkTopicsRoot);
  91                         for (String topic : topics) {
  92                                 result.add(new KafkaTopic(topic, fCambriaConfig, fBaseTopicData));
  93                         }
  94
  95                         JSONObject dataObj = new JSONObject();
  96                         dataObj.put("topics", new JSONObject());
  97
  98                         for (String topic : topics) {
  99                                 dataObj.getJSONObject("topics").put(topic, new JSONObject());
 100                         }
 101                 } catch (ZkNoNodeException excp) {
 102                         // very fresh kafka doesn't have any topics or a topics node
 103                         log.error("ZK doesn't have a Kakfa topics node at " + zkTopicsRoot, excp);
 104                 }
 105                 return result;
 106         }
 107
 108         @Override
 109         public Topic getTopic(String topic) throws ConfigDbException {
 110                 if (fZk.exists(zkTopicsRoot + "/" + topic)) {
 111                         return getKafkaTopicConfig(fCambriaConfig, fBaseTopicData, topic);
 112                 }
 113                 // else: no such topic in kafka
 114                 return null;
 115         }
 116
 117         /**
 118          * static method get KafkaTopic object
 119          *
 120          * @param db
 121          * @param base
 122          * @param topic
 123          * @return
 124          * @throws ConfigDbException
 125          */
 126         public static KafkaTopic getKafkaTopicConfig(ConfigDb db, ConfigPath base, String topic) throws ConfigDbException {
 127                 return new KafkaTopic(topic, db, base);
 128         }
 129
 130         /**
 131          * creating topic
 132          */
 133         @Override
 134         public Topic createTopic(String topic, String desc, String ownerApiKey, int partitions, int replicas,
 135                         boolean transactionEnabled) throws TopicExistsException, CambriaApiException {
 136                 log.info("Creating topic: " + topic);
 137                 try {
 138                         log.info("Check if topic [" + topic + "] exist.");
 139                         // first check for existence "our way"
 140                         final Topic t = getTopic(topic);
 141                         if (t != null) {
 142                                 log.info("Could not create topic [" + topic + "]. Topic Already exists.");
 143                                 throw new TopicExistsException("Could not create topic [" + topic + "]. Topic Alreay exists.");
 144                         }
 145                 } catch (ConfigDbException e1) {
 146                         log.error("Topic [" + topic + "] could not be created. Couldn't check topic data in config db.", e1);
 147                         throw new CambriaApiException(HttpStatusCodes.k503_serviceUnavailable,
 148                                         "Couldn't check topic data in config db.");
 149                 }
 150
 151                 // we only allow 3 replicas. (If we don't test this, we get weird
 152                 // results from the cluster,
 153                 // so explicit test and fail.)
 154                 if (replicas < 1 || replicas > 3) {
 155                         log.info("Topic [" + topic + "] could not be created. The replica count must be between 1 and 3.");
 156                         throw new CambriaApiException(HttpStatusCodes.k400_badRequest,
 157                                         "The replica count must be between 1 and 3.");
 158                 }
 159                 if (partitions < 1) {
 160                         log.info("Topic [" + topic + "] could not be created. The partition count must be at least 1.");
 161                         throw new CambriaApiException(HttpStatusCodes.k400_badRequest, "The partition count must be at least 1.");
 162                 }
 163
 164                 // create via kafka
 165                 try {
 166                         ZkClient zkClient = null;
 167                         try {
 168                                 log.info("Loading zookeeper client for creating topic.");
 169                                 // FIXME: use of this scala module$ thing is a goofy hack to
 170                                 // make Kafka aware of the
 171                                 // topic creation. (Otherwise, the topic is only partially
 172                                 // created in ZK.)
 173                                 zkClient = ZkClientFactory.createZkClient();
 174                                 log.info("Zookeeper client loaded successfully. Creating topic.");
 175                                 AdminUtils.createTopic(zkClient, topic, partitions, replicas, new Properties());
 176                         } catch (kafka.common.TopicExistsException e) {
 177                                 log.error("Topic [" + topic + "] could not be created. " + e.getMessage(), e);
 178                                 throw new TopicExistsException(topic);
 179                         } catch (ZkNoNodeException e) {
 180                                 log.error("Topic [" + topic + "] could not be created. The Kafka cluster is not setup.", e);
 181                                 // Kafka throws this when the server isn't running (and perhaps
 182                                 // hasn't ever run)
 183                                 throw new CambriaApiException(HttpStatusCodes.k503_serviceUnavailable,
 184                                                 "The Kafka cluster is not setup.");
 185                         } catch (kafka.admin.AdminOperationException e) {
 186                                 // Kafka throws this when the server isn't running (and perhaps
 187                                 // hasn't ever run)
 188                                 log.error("The Kafka cluster can't handle your request. Talk to the administrators: " + e.getMessage(),
 189                                                 e);
 190                                 throw new CambriaApiException(HttpStatusCodes.k503_serviceUnavailable,
 191                                                 "The Kafka cluster can't handle your request. Talk to the administrators.");
 192                         } finally {
 193                                 log.info("Closing zookeeper connection.");
 194                                 if (zkClient != null)
 195                                         zkClient.close();
 196                         }
 197
 198                         log.info("Creating topic entry for topic: " + topic);
 199                         // underlying Kafka topic created. now setup our API info
 200                         return createTopicEntry(topic, desc, ownerApiKey, transactionEnabled);
 201                 } catch (ConfigDbException excp) {
 202                         log.error("Failed to create topic data. Talk to the administrators: " + excp.getMessage(), excp);
 203                         throw new CambriaApiException(HttpStatusCodes.k503_serviceUnavailable,
 204                                         "Failed to create topic data. Talk to the administrators.");
 205                 }
 206         }
 207
 208         @Override
 209         public void deleteTopic(String topic) throws CambriaApiException, TopicExistsException {
 210                 log.info("Deleting topic: " + topic);
 211                 ZkClient zkClient = null;
 212                 try {
 213                         log.info("Loading zookeeper client for topic deletion.");
 214                         // FIXME: use of this scala module$ thing is a goofy hack to make
 215                         // Kafka aware of the
 216                         // topic creation. (Otherwise, the topic is only partially created
 217                         // in ZK.)
 218                         zkClient = ZkClientFactory.createZkClient();
 219
 220                         log.info("Zookeeper client loaded successfully. Deleting topic.");
 221                         AdminUtils.deleteTopic(zkClient, topic);
 222                 } catch (kafka.common.TopicExistsException e) {
 223                         log.error("Failed to delete topic [" + topic + "]. " + e.getMessage(), e);
 224                         throw new TopicExistsException(topic);
 225                 } catch (ZkNoNodeException e) {
 226                         log.error("Failed to delete topic [" + topic + "]. The Kafka cluster is not setup." + e.getMessage(), e);
 227                         // Kafka throws this when the server isn't running (and perhaps
 228                         // hasn't ever run)
 229                         throw new CambriaApiException(HttpStatusCodes.k503_serviceUnavailable, "The Kafka cluster is not setup.");
 230                 } catch (kafka.admin.AdminOperationException e) {
 231                         // Kafka throws this when the server isn't running (and perhaps
 232                         // hasn't ever run)
 233                         log.error("The Kafka cluster can't handle your request. Talk to the administrators." + e.getMessage(), e);
 234                         throw new CambriaApiException(HttpStatusCodes.k503_serviceUnavailable,
 235                                         "The Kafka cluster can't handle your request. Talk to the administrators.");
 236                 } finally {
 237                         log.info("Closing zookeeper connection.");
 238                         if (zkClient != null)
 239                                 zkClient.close();
 240                 }
 241
 242                 // throw new UnsupportedOperationException ( "We can't programmatically
 243                 // delete Kafka topics yet." );
 244         }
 245
 246
 247
 248         //private final rrNvReadable fSettings;
 249         private final ZkClient fZk;
 250         private final ConfigDb fCambriaConfig;
 251         private final ConfigPath fBaseTopicData;
 252
 253         private static final String zkTopicsRoot = "/brokers/topics";
 254         private static final JSONObject kEmptyAcl = new JSONObject();
 255
 256         /**
 257          * method Providing KafkaTopic Object associated with owner and
 258          * transactionenabled or not
 259          *
 260          * @param name
 261          * @param desc
 262          * @param owner
 263          * @param transactionEnabled
 264          * @return
 265          * @throws ConfigDbException
 266          */
 267         public KafkaTopic createTopicEntry(String name, String desc, String owner, boolean transactionEnabled)
 268                         throws ConfigDbException {
 269                 return createTopicEntry(fCambriaConfig, fBaseTopicData, name, desc, owner, transactionEnabled);
 270         }
 271
 272         /**
 273          * static method giving kafka topic object
 274          *
 275          * @param db
 276          * @param basePath
 277          * @param name
 278          * @param desc
 279          * @param owner
 280          * @param transactionEnabled
 281          * @return
 282          * @throws ConfigDbException
 283          */
 284         public static KafkaTopic createTopicEntry(ConfigDb db, ConfigPath basePath, String name, String desc, String owner,
 285                         boolean transactionEnabled) throws ConfigDbException {
 286                 final JSONObject o = new JSONObject();
 287                 o.put("owner", owner);
 288                 o.put("description", desc);
 289                 o.put("txenabled", transactionEnabled);
 290                 db.store(basePath.getChild(name), o.toString());
 291                 return new KafkaTopic(name, db, basePath);
 292         }
 293
 294         /**
 295          * class performing all user opearation like user is eligible to read,
 296          * write. permitting a user to write and read,
 297          *
 298          * @author author
 299          *
 300          */
 301         public static class KafkaTopic implements Topic {
 302                 /**
 303                  * constructor initializes
 304                  *
 305                  * @param name
 306                  * @param configdb
 307                  * @param baseTopic
 308                  * @throws ConfigDbException
 309                  */
 310                 public KafkaTopic(String name, ConfigDb configdb, ConfigPath baseTopic) throws ConfigDbException {
 311                         fName = name;
 312                         fConfigDb = configdb;
 313                         fBaseTopicData = baseTopic;
 314
 315                         String data = fConfigDb.load(fBaseTopicData.getChild(fName));
 316                         if (data == null) {
 317                                 data = "{}";
 318                         }
 319
 320                         final JSONObject o = new JSONObject(data);
 321                         fOwner = o.optString("owner", "");
 322                         fDesc = o.optString("description", "");
 323                         fTransactionEnabled = o.optBoolean("txenabled", false);// default
 324                                                                                                                                         // value is
 325                                                                                                                                         // false
 326                         // if this topic has an owner, it needs both read/write ACLs. If there's no
 327                                                 // owner (or it's empty), null is okay -- this is for existing or implicitly
 328                                                 // created topics.
 329                                                 JSONObject readers = o.optJSONObject ( "readers" );
 330                                                 if ( readers == null && fOwner.length () > 0 ) readers = kEmptyAcl;
 331                                                 fReaders = fromJson ( readers );
 332
 333                                                 JSONObject writers = o.optJSONObject ( "writers" );
 334                                                 if ( writers == null && fOwner.length () > 0 ) writers = kEmptyAcl;
 335                                                 fWriters = fromJson ( writers );
 336                 }
 337                  private NsaAcl fromJson(JSONObject o) {
 338                                 NsaAcl acl = new NsaAcl();
 339                                 if (o != null) {
 340                                         JSONArray a = o.optJSONArray("allowed");
 341                                         if (a != null) {
 342                                                 for (int i = 0; i < a.length(); ++i) {
 343                                                         String user = a.getString(i);
 344                                                         acl.add(user);
 345                                                 }
 346                                         }
 347                                 }
 348                                 return acl;
 349                         }
 350                 @Override
 351                 public String getName() {
 352                         return fName;
 353                 }
 354
 355                 @Override
 356                 public String getOwner() {
 357                         return fOwner;
 358                 }
 359
 360                 @Override
 361                 public String getDescription() {
 362                         return fDesc;
 363                 }
 364
 365                 @Override
 366                 public NsaAcl getReaderAcl() {
 367                         return fReaders;
 368                 }
 369
 370                 @Override
 371                 public NsaAcl getWriterAcl() {
 372                         return fWriters;
 373                 }
 374
 375                 @Override
 376                 public void checkUserRead(NsaApiKey user) throws AccessDeniedException  {
 377                         NsaAclUtils.checkUserAccess ( fOwner, getReaderAcl(), user );
 378                 }
 379
 380                 @Override
 381                 public void checkUserWrite(NsaApiKey user) throws AccessDeniedException  {
 382                         NsaAclUtils.checkUserAccess ( fOwner, getWriterAcl(), user );
 383                 }
 384
 385                 @Override
 386                 public void permitWritesFromUser(String pubId, NsaApiKey asUser)
 387                                 throws ConfigDbException, AccessDeniedException {
 388                         updateAcl(asUser, false, true, pubId);
 389                 }
 390
 391                 @Override
 392                 public void denyWritesFromUser(String pubId, NsaApiKey asUser) throws ConfigDbException, AccessDeniedException {
 393                         updateAcl(asUser, false, false, pubId);
 394                 }
 395
 396                 @Override
 397                 public void permitReadsByUser(String consumerId, NsaApiKey asUser)
 398                                 throws ConfigDbException, AccessDeniedException {
 399                         updateAcl(asUser, true, true, consumerId);
 400                 }
 401
 402                 @Override
 403                 public void denyReadsByUser(String consumerId, NsaApiKey asUser)
 404                                 throws ConfigDbException, AccessDeniedException {
 405                         updateAcl(asUser, true, false, consumerId);
 406                 }
 407
 408                 private void updateAcl(NsaApiKey asUser, boolean reader, boolean add, String key)
 409                                 throws ConfigDbException, AccessDeniedException{
 410                         try
 411                         {
 412                                 final NsaAcl acl = NsaAclUtils.updateAcl ( this, asUser, key, reader, add );
 413
 414                                 // we have to assume we have current data, or load it again. for the expected use
 415                                 // case, assuming we can overwrite the data is fine.
 416                                 final JSONObject o = new JSONObject ();
 417                                 o.put ( "owner", fOwner );
 418                                 o.put ( "readers", safeSerialize ( reader ? acl : fReaders ) );
 419                                 o.put ( "writers", safeSerialize ( reader ? fWriters : acl ) );
 420                                 fConfigDb.store ( fBaseTopicData.getChild ( fName ), o.toString () );
 421
 422                                 log.info ( "ACL_UPDATE: " + asUser.getKey () + " " + ( add ? "added" : "removed" ) + ( reader?"subscriber":"publisher" ) + " " + key + " on " + fName );
 423
 424                         }
 425                         catch ( ConfigDbException x )
 426                         {
 427                                 throw x;
 428                         }
 429                         catch ( AccessDeniedException x )
 430                         {
 431                                 throw x;
 432                         }
 433
 434                 }
 435
 436                 private JSONObject safeSerialize(NsaAcl acl) {
 437                         return acl == null ? null : acl.serialize();
 438                 }
 439
 440                 private final String fName;
 441                 private final ConfigDb fConfigDb;
 442                 private final ConfigPath fBaseTopicData;
 443                 private final String fOwner;
 444                 private final String fDesc;
 445                 private final NsaAcl fReaders;
 446                 private final NsaAcl fWriters;
 447                 private boolean fTransactionEnabled;
 448
 449                 public boolean isTransactionEnabled() {
 450                         return fTransactionEnabled;
 451                 }
 452
 453                 @Override
 454                 public Set<String> getOwners() {
 455                         final TreeSet<String> owners = new TreeSet<String> ();
 456                         owners.add ( fOwner );
 457                         return owners;
 458                 }
 459         }
 460
 461 }