khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2018-present Open Networking Foundation |
| 3 | |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package kafka |
| 17 | |
| 18 | import ( |
| 19 | "errors" |
| 20 | "fmt" |
| 21 | "github.com/Shopify/sarama" |
| 22 | scc "github.com/bsm/sarama-cluster" |
| 23 | "github.com/golang/protobuf/proto" |
| 24 | "github.com/opencord/voltha-go/common/log" |
| 25 | ca "github.com/opencord/voltha-go/protos/core_adapter" |
| 26 | "sync" |
| 27 | "time" |
| 28 | ) |
| 29 | |
| 30 | // consumerChannels represents a consumer listening on a kafka topic. Once it receives a message on that |
| 31 | // topic it broadcasts the message to all the listening channels |
| 32 | type consumerChannels struct { |
| 33 | consumer sarama.PartitionConsumer |
| 34 | //consumer *sc.Consumer |
| 35 | channels []chan *ca.InterContainerMessage |
| 36 | } |
| 37 | |
| 38 | // SaramaClient represents the messaging proxy |
| 39 | type SaramaClient struct { |
| 40 | broker *sarama.Broker |
| 41 | client sarama.Client |
| 42 | KafkaHost string |
| 43 | KafkaPort int |
| 44 | producer sarama.AsyncProducer |
| 45 | consumer sarama.Consumer |
| 46 | groupConsumer *scc.Consumer |
| 47 | doneCh chan int |
| 48 | topicToConsumerChannelMap map[string]*consumerChannels |
| 49 | lockTopicToConsumerChannelMap sync.RWMutex |
| 50 | } |
| 51 | |
| 52 | type SaramaClientOption func(*SaramaClient) |
| 53 | |
| 54 | func Host(host string) SaramaClientOption { |
| 55 | return func(args *SaramaClient) { |
| 56 | args.KafkaHost = host |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | func Port(port int) SaramaClientOption { |
| 61 | return func(args *SaramaClient) { |
| 62 | args.KafkaPort = port |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | func NewSaramaClient(opts ...SaramaClientOption) *SaramaClient { |
| 67 | client := &SaramaClient{ |
| 68 | KafkaHost: DefaultKafkaHost, |
| 69 | KafkaPort: DefaultKafkaPort, |
| 70 | } |
| 71 | |
| 72 | for _, option := range opts { |
| 73 | option(client) |
| 74 | } |
| 75 | |
| 76 | client.lockTopicToConsumerChannelMap = sync.RWMutex{} |
| 77 | |
| 78 | return client |
| 79 | } |
| 80 | |
| 81 | func (sc *SaramaClient) Start(retries int) error { |
| 82 | log.Info("Starting-Proxy") |
| 83 | |
| 84 | // Create the Done channel |
| 85 | sc.doneCh = make(chan int, 1) |
| 86 | |
| 87 | // Create the Publisher |
| 88 | if err := sc.createPublisher(retries); err != nil { |
| 89 | log.Errorw("Cannot-create-kafka-publisher", log.Fields{"error": err}) |
| 90 | return err |
| 91 | } |
| 92 | |
| 93 | // Create the master consumer |
| 94 | if err := sc.createConsumer(retries); err != nil { |
| 95 | log.Errorw("Cannot-create-kafka-consumer", log.Fields{"error": err}) |
| 96 | return err |
| 97 | } |
| 98 | |
| 99 | // Create the topic to consumer/channel map |
| 100 | sc.topicToConsumerChannelMap = make(map[string]*consumerChannels) |
| 101 | |
| 102 | return nil |
| 103 | } |
| 104 | |
| 105 | func (sc *SaramaClient) Stop() { |
| 106 | log.Info("stopping-sarama-client") |
| 107 | |
| 108 | //Send a message over the done channel to close all long running routines |
| 109 | sc.doneCh <- 1 |
| 110 | |
| 111 | // Clear the consumer map |
| 112 | //sc.clearConsumerChannelMap() |
| 113 | |
| 114 | if sc.producer != nil { |
| 115 | if err := sc.producer.Close(); err != nil { |
| 116 | panic(err) |
| 117 | } |
| 118 | } |
| 119 | if sc.consumer != nil { |
| 120 | if err := sc.consumer.Close(); err != nil { |
| 121 | panic(err) |
| 122 | } |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | func (sc *SaramaClient) addTopicToConsumerChannelMap(id string, arg *consumerChannels) { |
| 127 | sc.lockTopicToConsumerChannelMap.Lock() |
| 128 | defer sc.lockTopicToConsumerChannelMap.Unlock() |
| 129 | if _, exist := sc.topicToConsumerChannelMap[id]; !exist { |
| 130 | sc.topicToConsumerChannelMap[id] = arg |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | func (sc *SaramaClient) deleteFromTopicToConsumerChannelMap(id string) { |
| 135 | sc.lockTopicToConsumerChannelMap.Lock() |
| 136 | defer sc.lockTopicToConsumerChannelMap.Unlock() |
| 137 | if _, exist := sc.topicToConsumerChannelMap[id]; exist { |
| 138 | delete(sc.topicToConsumerChannelMap, id) |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | func (sc *SaramaClient) getConsumerChannel(topic Topic) *consumerChannels { |
| 143 | sc.lockTopicToConsumerChannelMap.Lock() |
| 144 | defer sc.lockTopicToConsumerChannelMap.Unlock() |
| 145 | |
| 146 | if consumerCh, exist := sc.topicToConsumerChannelMap[topic.Name]; exist { |
| 147 | return consumerCh |
| 148 | } |
| 149 | return nil |
| 150 | } |
| 151 | |
| 152 | func (sc *SaramaClient) addChannelToConsumerChannelMap(topic Topic, ch chan *ca.InterContainerMessage) { |
| 153 | sc.lockTopicToConsumerChannelMap.Lock() |
| 154 | defer sc.lockTopicToConsumerChannelMap.Unlock() |
| 155 | if consumerCh, exist := sc.topicToConsumerChannelMap[topic.Name]; exist { |
| 156 | consumerCh.channels = append(consumerCh.channels, ch) |
| 157 | return |
| 158 | } |
| 159 | log.Warnw("consumer-channel-not-exist", log.Fields{"topic": topic.Name}) |
| 160 | } |
| 161 | |
| 162 | func (sc *SaramaClient) removeChannelFromConsumerChannelMap(topic Topic, ch <-chan *ca.InterContainerMessage) error { |
| 163 | sc.lockTopicToConsumerChannelMap.Lock() |
| 164 | defer sc.lockTopicToConsumerChannelMap.Unlock() |
| 165 | if consumerCh, exist := sc.topicToConsumerChannelMap[topic.Name]; exist { |
| 166 | // Channel will be closed in the removeChannel method |
| 167 | consumerCh.channels = removeChannel(consumerCh.channels, ch) |
| 168 | // If there are no more channels then we can close the consumer itself |
| 169 | if len(consumerCh.channels) == 0 { |
| 170 | log.Debugw("closing-consumer", log.Fields{"topic": topic}) |
| 171 | err := consumerCh.consumer.Close() |
| 172 | delete(sc.topicToConsumerChannelMap, topic.Name) |
| 173 | return err |
| 174 | } |
| 175 | return nil |
| 176 | } |
| 177 | log.Warnw("topic-does-not-exist", log.Fields{"topic": topic.Name}) |
| 178 | return errors.New("topic-does-not-exist") |
| 179 | } |
| 180 | |
| 181 | func (sc *SaramaClient) clearTopicFromConsumerChannelMap(topic Topic) error { |
| 182 | sc.lockTopicToConsumerChannelMap.Lock() |
| 183 | defer sc.lockTopicToConsumerChannelMap.Unlock() |
| 184 | if consumerCh, exist := sc.topicToConsumerChannelMap[topic.Name]; exist { |
| 185 | for _, ch := range consumerCh.channels { |
| 186 | // Channel will be closed in the removeChannel method |
| 187 | removeChannel(consumerCh.channels, ch) |
| 188 | } |
| 189 | err := consumerCh.consumer.Close() |
| 190 | delete(sc.topicToConsumerChannelMap, topic.Name) |
| 191 | return err |
| 192 | } |
| 193 | log.Warnw("topic-does-not-exist", log.Fields{"topic": topic.Name}) |
| 194 | return errors.New("topic-does-not-exist") |
| 195 | } |
| 196 | |
| 197 | func (sc *SaramaClient) clearConsumerChannelMap() error { |
| 198 | sc.lockTopicToConsumerChannelMap.Lock() |
| 199 | defer sc.lockTopicToConsumerChannelMap.Unlock() |
| 200 | var err error |
| 201 | for topic, consumerCh := range sc.topicToConsumerChannelMap { |
| 202 | for _, ch := range consumerCh.channels { |
| 203 | // Channel will be closed in the removeChannel method |
| 204 | removeChannel(consumerCh.channels, ch) |
| 205 | } |
| 206 | err = consumerCh.consumer.Close() |
| 207 | delete(sc.topicToConsumerChannelMap, topic) |
| 208 | } |
| 209 | return err |
| 210 | } |
| 211 | |
| 212 | func (sc *SaramaClient) CreateTopic(topic *Topic, numPartition int, repFactor int, retries int) error { |
| 213 | // This Creates the kafka topic |
| 214 | // Set broker configuration |
| 215 | kafkaFullAddr := fmt.Sprintf("%s:%d", sc.KafkaHost, sc.KafkaPort) |
| 216 | broker := sarama.NewBroker(kafkaFullAddr) |
| 217 | |
| 218 | // Additional configurations. Check sarama doc for more info |
| 219 | config := sarama.NewConfig() |
| 220 | config.Version = sarama.V1_0_0_0 |
| 221 | |
| 222 | // Open broker connection with configs defined above |
| 223 | broker.Open(config) |
| 224 | |
| 225 | // check if the connection was OK |
| 226 | _, err := broker.Connected() |
| 227 | if err != nil { |
| 228 | return err |
| 229 | } |
| 230 | |
| 231 | topicDetail := &sarama.TopicDetail{} |
| 232 | topicDetail.NumPartitions = int32(numPartition) |
| 233 | topicDetail.ReplicationFactor = int16(repFactor) |
| 234 | topicDetail.ConfigEntries = make(map[string]*string) |
| 235 | |
| 236 | topicDetails := make(map[string]*sarama.TopicDetail) |
| 237 | topicDetails[topic.Name] = topicDetail |
| 238 | |
| 239 | request := sarama.CreateTopicsRequest{ |
| 240 | Timeout: time.Second * 1, |
| 241 | TopicDetails: topicDetails, |
| 242 | } |
| 243 | |
| 244 | for { |
| 245 | // Send request to Broker |
| 246 | if response, err := broker.CreateTopics(&request); err != nil { |
| 247 | if retries == 0 { |
| 248 | log.Errorw("error-creating-topic", log.Fields{"error": err}) |
| 249 | return err |
| 250 | } else { |
| 251 | // If retries is -ve then we will retry indefinitely |
| 252 | retries-- |
| 253 | } |
| 254 | log.Debug("retrying-after-a-second-delay") |
| 255 | time.Sleep(time.Duration(DefaultSleepOnError) * time.Second) |
| 256 | } else { |
| 257 | log.Debug("topic-response", log.Fields{"response": response}) |
| 258 | break |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | log.Debug("topic-created", log.Fields{"topic": topic, "numPartition": numPartition, "replicationFactor": repFactor}) |
| 263 | return nil |
| 264 | } |
| 265 | |
| 266 | func (sc *SaramaClient) createPublisher(retries int) error { |
| 267 | // This Creates the publisher |
| 268 | config := sarama.NewConfig() |
| 269 | config.Producer.Partitioner = sarama.NewRandomPartitioner |
| 270 | config.Producer.Flush.Frequency = time.Duration(DefaultFlushFrequency) |
| 271 | config.Producer.Flush.Messages = DefaultFlushMessages |
| 272 | config.Producer.Flush.MaxMessages = DefaultFlushMaxmessages |
| 273 | config.Producer.Return.Errors = DefaultReturnErrors |
| 274 | config.Producer.Return.Successes = DefaultReturnSuccess |
| 275 | config.Producer.RequiredAcks = sarama.WaitForAll |
| 276 | kafkaFullAddr := fmt.Sprintf("%s:%d", sc.KafkaHost, sc.KafkaPort) |
| 277 | brokers := []string{kafkaFullAddr} |
| 278 | |
| 279 | for { |
| 280 | producer, err := sarama.NewAsyncProducer(brokers, config) |
| 281 | if err != nil { |
| 282 | if retries == 0 { |
| 283 | log.Errorw("error-starting-publisher", log.Fields{"error": err}) |
| 284 | return err |
| 285 | } else { |
| 286 | // If retries is -ve then we will retry indefinitely |
| 287 | retries-- |
| 288 | } |
| 289 | log.Info("retrying-after-a-second-delay") |
| 290 | time.Sleep(time.Duration(DefaultSleepOnError) * time.Second) |
| 291 | } else { |
| 292 | sc.producer = producer |
| 293 | break |
| 294 | } |
| 295 | } |
| 296 | log.Info("Kafka-publisher-created") |
| 297 | return nil |
| 298 | } |
| 299 | |
| 300 | func (sc *SaramaClient) createConsumer(retries int) error { |
| 301 | config := sarama.NewConfig() |
| 302 | config.Consumer.Return.Errors = true |
| 303 | config.Consumer.Fetch.Min = 1 |
| 304 | config.Consumer.MaxWaitTime = time.Duration(DefaultConsumerMaxwait) * time.Millisecond |
| 305 | config.Consumer.MaxProcessingTime = time.Duration(DefaultMaxProcessingTime) * time.Millisecond |
| 306 | config.Consumer.Offsets.Initial = sarama.OffsetNewest |
| 307 | kafkaFullAddr := fmt.Sprintf("%s:%d", sc.KafkaHost, sc.KafkaPort) |
| 308 | brokers := []string{kafkaFullAddr} |
| 309 | |
| 310 | for { |
| 311 | consumer, err := sarama.NewConsumer(brokers, config) |
| 312 | if err != nil { |
| 313 | if retries == 0 { |
| 314 | log.Errorw("error-starting-consumer", log.Fields{"error": err}) |
| 315 | return err |
| 316 | } else { |
| 317 | // If retries is -ve then we will retry indefinitely |
| 318 | retries-- |
| 319 | } |
| 320 | log.Info("retrying-after-a-second-delay") |
| 321 | time.Sleep(time.Duration(DefaultSleepOnError) * time.Second) |
| 322 | } else { |
| 323 | sc.consumer = consumer |
| 324 | break |
| 325 | } |
| 326 | } |
| 327 | log.Info("Kafka-consumer-created") |
| 328 | return nil |
| 329 | } |
| 330 | |
| 331 | // createGroupConsumer creates a consumer group |
| 332 | func (sc *SaramaClient) createGroupConsumer(topic *Topic, groupId *string, retries int) (*scc.Consumer, error) { |
| 333 | config := scc.NewConfig() |
| 334 | config.Group.Mode = scc.ConsumerModeMultiplex |
| 335 | config.Consumer.Return.Errors = true |
| 336 | config.Group.Return.Notifications = true |
| 337 | config.Consumer.MaxWaitTime = time.Duration(DefaultConsumerMaxwait) * time.Millisecond |
| 338 | config.Consumer.MaxProcessingTime = time.Duration(DefaultMaxProcessingTime) * time.Millisecond |
| 339 | config.Consumer.Offsets.Initial = sarama.OffsetNewest |
| 340 | kafkaFullAddr := fmt.Sprintf("%s:%d", sc.KafkaHost, sc.KafkaPort) |
| 341 | brokers := []string{kafkaFullAddr} |
| 342 | |
| 343 | if groupId == nil { |
| 344 | g := DefaultGroupName |
| 345 | groupId = &g |
| 346 | } |
| 347 | topics := []string{topic.Name} |
| 348 | var consumer *scc.Consumer |
| 349 | var err error |
| 350 | |
| 351 | // Create the topic with default attributes |
| 352 | // TODO: needs to be revisited |
| 353 | //sc.CreateTopic(&Topic{Name:topic.Name}, 3, 1, 1) |
| 354 | |
| 355 | if consumer, err = scc.NewConsumer(brokers, *groupId, topics, config); err != nil { |
| 356 | log.Errorw("create-consumer-failure", log.Fields{"error": err, "topic": topic.Name, "groupId": groupId}) |
| 357 | return nil, err |
| 358 | } |
| 359 | log.Debugw("create-consumer-success", log.Fields{"topic": topic.Name, "groupId": groupId}) |
| 360 | //time.Sleep(10*time.Second) |
| 361 | sc.groupConsumer = consumer |
| 362 | return consumer, nil |
| 363 | } |
| 364 | |
| 365 | // send formats and sends the request onto the kafka messaging bus. |
| 366 | func (sc *SaramaClient) Send(msg interface{}, topic *Topic, keys ...string) { |
| 367 | |
| 368 | // Assert message is a proto message |
| 369 | var protoMsg proto.Message |
| 370 | var ok bool |
| 371 | // ascertain the value interface type is a proto.Message |
| 372 | if protoMsg, ok = msg.(proto.Message); !ok { |
| 373 | log.Warnw("message-not-proto-message", log.Fields{"msg": msg}) |
| 374 | return |
| 375 | } |
| 376 | |
| 377 | // Create the Sarama producer message |
| 378 | marshalled, _ := proto.Marshal(protoMsg) |
| 379 | key := "" |
| 380 | if len(keys) > 0 { |
| 381 | key = keys[0] // Only the first key is relevant |
| 382 | } |
| 383 | kafkaMsg := &sarama.ProducerMessage{ |
| 384 | Topic: topic.Name, |
| 385 | Key: sarama.StringEncoder(key), |
| 386 | Value: sarama.ByteEncoder(marshalled), |
| 387 | } |
| 388 | |
| 389 | // Send message to kafka |
| 390 | sc.producer.Input() <- kafkaMsg |
| 391 | } |
| 392 | |
| 393 | // Subscribe registers a caller to a topic. It returns a channel that the caller can use to receive |
| 394 | // messages from that topic |
| 395 | func (sc *SaramaClient) Subscribe(topic *Topic, retries int) (<-chan *ca.InterContainerMessage, error) { |
| 396 | log.Debugw("subscribe", log.Fields{"topic": topic.Name}) |
| 397 | |
| 398 | // If a consumer already exist for that topic then resuse it |
| 399 | if consumerCh := sc.getConsumerChannel(*topic); consumerCh != nil { |
| 400 | log.Debugw("topic-already-subscribed", log.Fields{"topic": topic.Name}) |
| 401 | // Create a channel specific for that consumer and add it to the consumer channel map |
| 402 | ch := make(chan *ca.InterContainerMessage) |
| 403 | sc.addChannelToConsumerChannelMap(*topic, ch) |
| 404 | return ch, nil |
| 405 | } |
| 406 | |
| 407 | // Register for the topic and set it up |
| 408 | var consumerListeningChannel chan *ca.InterContainerMessage |
| 409 | var err error |
| 410 | if consumerListeningChannel, err = sc.setupConsumerChannel(topic); err != nil { |
| 411 | log.Warnw("create-consumer-channel-failure", log.Fields{"error": err, "topic": topic.Name}) |
| 412 | return nil, err |
| 413 | } |
| 414 | |
| 415 | return consumerListeningChannel, nil |
| 416 | } |
| 417 | |
| 418 | // dispatchToConsumers sends the intercontainermessage received on a given topic to all subscribers for that |
| 419 | // topic via the unique channel each subsciber received during subscription |
| 420 | func (sc *SaramaClient) dispatchToConsumers(consumerCh *consumerChannels, protoMessage *ca.InterContainerMessage) { |
| 421 | // Need to go over all channels and publish messages to them - do we need to copy msg? |
| 422 | sc.lockTopicToConsumerChannelMap.Lock() |
| 423 | defer sc.lockTopicToConsumerChannelMap.Unlock() |
| 424 | for _, ch := range consumerCh.channels { |
| 425 | go func(c chan *ca.InterContainerMessage) { |
| 426 | c <- protoMessage |
| 427 | }(ch) |
| 428 | } |
| 429 | } |
| 430 | |
| 431 | func (sc *SaramaClient) consumeMessagesLoop(topic Topic) { |
| 432 | log.Debugw("starting-consuming-messages", log.Fields{"topic": topic.Name}) |
| 433 | var consumerCh *consumerChannels |
| 434 | if consumerCh = sc.getConsumerChannel(topic); consumerCh == nil { |
| 435 | log.Errorw("consumer-not-exist", log.Fields{"topic": topic.Name}) |
| 436 | return |
| 437 | } |
| 438 | startloop: |
| 439 | for { |
| 440 | select { |
| 441 | case err := <-consumerCh.consumer.Errors(): |
| 442 | log.Warnw("consumer-error", log.Fields{"error": err}) |
| 443 | case msg := <-consumerCh.consumer.Messages(): |
| 444 | //log.Debugw("message-received", log.Fields{"msg": msg, "receivedTopic": msg.Topic}) |
| 445 | // Since the only expected message is a proto intercontainermessage then extract it right away |
| 446 | // instead of dispatching it to the consumers |
| 447 | msgBody := msg.Value |
| 448 | icm := &ca.InterContainerMessage{} |
| 449 | if err := proto.Unmarshal(msgBody, icm); err != nil { |
| 450 | log.Warnw("invalid-message", log.Fields{"error": err}) |
| 451 | continue |
| 452 | } |
| 453 | go sc.dispatchToConsumers(consumerCh, icm) |
| 454 | |
| 455 | //consumerCh.consumer.MarkOffset(msg, "") |
| 456 | //// TODO: Dispatch requests and responses separately |
| 457 | case <-sc.doneCh: |
| 458 | log.Infow("received-exit-signal", log.Fields{"topic": topic.Name}) |
| 459 | break startloop |
| 460 | } |
| 461 | } |
| 462 | log.Infow("received-exit-signal-out-of-for-loop", log.Fields{"topic": topic.Name}) |
| 463 | } |
| 464 | |
| 465 | // setupConsumerChannel creates a consumerChannels object for that topic and add it to the consumerChannels map |
| 466 | // for that topic. It also starts the routine that listens for messages on that topic. |
| 467 | func (sc *SaramaClient) setupConsumerChannel(topic *Topic) (chan *ca.InterContainerMessage, error) { |
| 468 | // TODO: Replace this development partition consumer with a group consumer |
| 469 | var pConsumer *sarama.PartitionConsumer |
| 470 | var err error |
| 471 | if pConsumer, err = sc.CreatePartionConsumer(topic, DefaultMaxRetries); err != nil { |
| 472 | log.Errorw("creating-partition-consumer-failure", log.Fields{"error": err, "topic": topic.Name}) |
| 473 | return nil, err |
| 474 | } |
| 475 | |
| 476 | // Create the consumer/channel structure and set the consumer and create a channel on that topic - for now |
| 477 | // unbuffered to verify race conditions. |
| 478 | consumerListeningChannel := make(chan *ca.InterContainerMessage) |
| 479 | cc := &consumerChannels{ |
| 480 | consumer: *pConsumer, |
| 481 | channels: []chan *ca.InterContainerMessage{consumerListeningChannel}, |
| 482 | } |
| 483 | |
| 484 | // Add the consumer channel to the map |
| 485 | sc.addTopicToConsumerChannelMap(topic.Name, cc) |
| 486 | |
| 487 | //Start a consumer to listen on that specific topic |
| 488 | go sc.consumeMessagesLoop(*topic) |
| 489 | |
| 490 | return consumerListeningChannel, nil |
| 491 | } |
| 492 | |
| 493 | func (sc *SaramaClient) CreatePartionConsumer(topic *Topic, retries int) (*sarama.PartitionConsumer, error) { |
| 494 | log.Debugw("creating-partition-consumer", log.Fields{"topic": topic.Name}) |
| 495 | partitionList, err := sc.consumer.Partitions(topic.Name) |
| 496 | if err != nil { |
| 497 | log.Warnw("get-partition-failure", log.Fields{"error": err, "topic": topic.Name}) |
| 498 | return nil, err |
| 499 | } |
| 500 | |
| 501 | log.Debugw("partitions", log.Fields{"topic": topic.Name, "partitionList": partitionList, "first": partitionList[0]}) |
| 502 | // Create a partition consumer for that topic - for now just use one partition |
| 503 | var pConsumer sarama.PartitionConsumer |
| 504 | if pConsumer, err = sc.consumer.ConsumePartition(topic.Name, partitionList[0], sarama.OffsetNewest); err != nil { |
| 505 | log.Warnw("consumer-partition-failure", log.Fields{"error": err, "topic": topic.Name}) |
| 506 | return nil, err |
| 507 | } |
| 508 | log.Debugw("partition-consumer-created", log.Fields{"topic": topic.Name}) |
| 509 | return &pConsumer, nil |
| 510 | } |
| 511 | |
| 512 | func (sc *SaramaClient) UnSubscribe(topic *Topic, ch <-chan *ca.InterContainerMessage) error { |
| 513 | log.Debugw("unsubscribing-channel-from-topic", log.Fields{"topic": topic.Name}) |
| 514 | err := sc.removeChannelFromConsumerChannelMap(*topic, ch) |
| 515 | return err |
| 516 | } |
| 517 | |
| 518 | func removeChannel(channels []chan *ca.InterContainerMessage, ch <-chan *ca.InterContainerMessage) []chan *ca.InterContainerMessage { |
| 519 | var i int |
| 520 | var channel chan *ca.InterContainerMessage |
| 521 | for i, channel = range channels { |
| 522 | if channel == ch { |
| 523 | channels[len(channels)-1], channels[i] = channels[i], channels[len(channels)-1] |
| 524 | close(channel) |
| 525 | return channels[:len(channels)-1] |
| 526 | } |
| 527 | } |
| 528 | return channels |
| 529 | } |
| 530 | |
| 531 | func (sc *SaramaClient) DeleteTopic(topic *Topic) error { |
| 532 | if err := sc.clearTopicFromConsumerChannelMap(*topic); err != nil { |
| 533 | log.Errorw("failure-clearing-channels", log.Fields{"topic": topic, "error": err}) |
| 534 | return err |
| 535 | } |
| 536 | return nil |
| 537 | } |