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" |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 21 | scc "github.com/bsm/sarama-cluster" |
| 22 | "github.com/golang/protobuf/proto" |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 23 | "github.com/google/uuid" |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 24 | "github.com/opencord/voltha-go/common/log" |
| 25 | ca "github.com/opencord/voltha-go/protos/core_adapter" |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 26 | "gopkg.in/Shopify/sarama.v1" |
| 27 | "strings" |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 28 | "sync" |
| 29 | "time" |
| 30 | ) |
| 31 | |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 32 | func init() { |
| 33 | log.AddPackage(log.JSON, log.WarnLevel, nil) |
| 34 | } |
| 35 | |
| 36 | type returnErrorFunction func() error |
| 37 | |
| 38 | // consumerChannels represents one or more consumers listening on a kafka topic. Once a message is received on that |
| 39 | // topic, the consumer(s) broadcasts the message to all the listening channels. The consumer can be a partition |
| 40 | //consumer or a group consumer |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 41 | type consumerChannels struct { |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 42 | consumers []interface{} |
| 43 | channels []chan *ca.InterContainerMessage |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 44 | } |
| 45 | |
| 46 | // SaramaClient represents the messaging proxy |
| 47 | type SaramaClient struct { |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 48 | cAdmin sarama.ClusterAdmin |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 49 | client sarama.Client |
| 50 | KafkaHost string |
| 51 | KafkaPort int |
| 52 | producer sarama.AsyncProducer |
| 53 | consumer sarama.Consumer |
| 54 | groupConsumer *scc.Consumer |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 55 | consumerType int |
| 56 | groupName string |
| 57 | producerFlushFrequency int |
| 58 | producerFlushMessages int |
| 59 | producerFlushMaxmessages int |
| 60 | producerRetryMax int |
| 61 | producerRetryBackOff time.Duration |
| 62 | producerReturnSuccess bool |
| 63 | producerReturnErrors bool |
| 64 | consumerMaxwait int |
| 65 | maxProcessingTime int |
| 66 | numPartitions int |
| 67 | numReplicas int |
| 68 | autoCreateTopic bool |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 69 | doneCh chan int |
| 70 | topicToConsumerChannelMap map[string]*consumerChannels |
| 71 | lockTopicToConsumerChannelMap sync.RWMutex |
| 72 | } |
| 73 | |
| 74 | type SaramaClientOption func(*SaramaClient) |
| 75 | |
| 76 | func Host(host string) SaramaClientOption { |
| 77 | return func(args *SaramaClient) { |
| 78 | args.KafkaHost = host |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | func Port(port int) SaramaClientOption { |
| 83 | return func(args *SaramaClient) { |
| 84 | args.KafkaPort = port |
| 85 | } |
| 86 | } |
| 87 | |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 88 | func ConsumerType(consumer int) SaramaClientOption { |
| 89 | return func(args *SaramaClient) { |
| 90 | args.consumerType = consumer |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | func ProducerFlushFrequency(frequency int) SaramaClientOption { |
| 95 | return func(args *SaramaClient) { |
| 96 | args.producerFlushFrequency = frequency |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | func ProducerFlushMessages(num int) SaramaClientOption { |
| 101 | return func(args *SaramaClient) { |
| 102 | args.producerFlushMessages = num |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | func ProducerFlushMaxMessages(num int) SaramaClientOption { |
| 107 | return func(args *SaramaClient) { |
| 108 | args.producerFlushMaxmessages = num |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | func ReturnOnErrors(opt bool) SaramaClientOption { |
| 113 | return func(args *SaramaClient) { |
| 114 | args.producerReturnErrors = opt |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | func ReturnOnSuccess(opt bool) SaramaClientOption { |
| 119 | return func(args *SaramaClient) { |
| 120 | args.producerReturnSuccess = opt |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | func ConsumerMaxWait(wait int) SaramaClientOption { |
| 125 | return func(args *SaramaClient) { |
| 126 | args.consumerMaxwait = wait |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | func MaxProcessingTime(pTime int) SaramaClientOption { |
| 131 | return func(args *SaramaClient) { |
| 132 | args.maxProcessingTime = pTime |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | func NumPartitions(number int) SaramaClientOption { |
| 137 | return func(args *SaramaClient) { |
| 138 | args.numPartitions = number |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | func NumReplicas(number int) SaramaClientOption { |
| 143 | return func(args *SaramaClient) { |
| 144 | args.numReplicas = number |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | func AutoCreateTopic(opt bool) SaramaClientOption { |
| 149 | return func(args *SaramaClient) { |
| 150 | args.autoCreateTopic = opt |
| 151 | } |
| 152 | } |
| 153 | |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 154 | func NewSaramaClient(opts ...SaramaClientOption) *SaramaClient { |
| 155 | client := &SaramaClient{ |
| 156 | KafkaHost: DefaultKafkaHost, |
| 157 | KafkaPort: DefaultKafkaPort, |
| 158 | } |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 159 | client.consumerType = DefaultConsumerType |
| 160 | client.producerFlushFrequency = DefaultProducerFlushFrequency |
| 161 | client.producerFlushMessages = DefaultProducerFlushMessages |
| 162 | client.producerFlushMaxmessages = DefaultProducerFlushMaxmessages |
| 163 | client.producerReturnErrors = DefaultProducerReturnErrors |
| 164 | client.producerReturnSuccess = DefaultProducerReturnSuccess |
| 165 | client.producerRetryMax = DefaultProducerRetryMax |
| 166 | client.producerRetryBackOff = DefaultProducerRetryBackoff |
| 167 | client.consumerMaxwait = DefaultConsumerMaxwait |
| 168 | client.maxProcessingTime = DefaultMaxProcessingTime |
| 169 | client.numPartitions = DefaultNumberPartitions |
| 170 | client.numReplicas = DefaultNumberReplicas |
| 171 | client.autoCreateTopic = DefaultAutoCreateTopic |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 172 | |
| 173 | for _, option := range opts { |
| 174 | option(client) |
| 175 | } |
| 176 | |
| 177 | client.lockTopicToConsumerChannelMap = sync.RWMutex{} |
| 178 | |
| 179 | return client |
| 180 | } |
| 181 | |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 182 | func (sc *SaramaClient) Start() error { |
| 183 | log.Info("Starting-kafka-sarama-client") |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 184 | |
| 185 | // Create the Done channel |
| 186 | sc.doneCh = make(chan int, 1) |
| 187 | |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 188 | var err error |
| 189 | |
| 190 | // Create the Cluster Admin |
| 191 | if err = sc.createClusterAdmin(); err != nil { |
| 192 | log.Errorw("Cannot-create-cluster-admin", log.Fields{"error": err}) |
| 193 | return err |
| 194 | } |
| 195 | |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 196 | // Create the Publisher |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 197 | if err := sc.createPublisher(); err != nil { |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 198 | log.Errorw("Cannot-create-kafka-publisher", log.Fields{"error": err}) |
| 199 | return err |
| 200 | } |
| 201 | |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 202 | // Create the master consumers |
| 203 | if err := sc.createConsumer(); err != nil { |
| 204 | log.Errorw("Cannot-create-kafka-consumers", log.Fields{"error": err}) |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 205 | return err |
| 206 | } |
| 207 | |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 208 | // Create the topic to consumers/channel map |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 209 | sc.topicToConsumerChannelMap = make(map[string]*consumerChannels) |
| 210 | |
| 211 | return nil |
| 212 | } |
| 213 | |
| 214 | func (sc *SaramaClient) Stop() { |
| 215 | log.Info("stopping-sarama-client") |
| 216 | |
| 217 | //Send a message over the done channel to close all long running routines |
| 218 | sc.doneCh <- 1 |
| 219 | |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 220 | if sc.producer != nil { |
| 221 | if err := sc.producer.Close(); err != nil { |
| 222 | panic(err) |
| 223 | } |
| 224 | } |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 225 | |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 226 | if sc.consumer != nil { |
| 227 | if err := sc.consumer.Close(); err != nil { |
| 228 | panic(err) |
| 229 | } |
| 230 | } |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 231 | |
| 232 | if sc.groupConsumer != nil { |
| 233 | if err := sc.groupConsumer.Close(); err != nil { |
| 234 | panic(err) |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | if sc.cAdmin != nil { |
| 239 | if err := sc.cAdmin.Close(); err != nil { |
| 240 | panic(err) |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | //TODO: Clear the consumers map |
| 245 | sc.clearConsumerChannelMap() |
| 246 | |
| 247 | log.Info("sarama-client-stopped") |
| 248 | } |
| 249 | |
| 250 | //CreateTopic creates a topic on the Kafka Broker. |
| 251 | func (sc *SaramaClient) CreateTopic(topic *Topic, numPartition int, repFactor int) error { |
| 252 | // Set the topic details |
| 253 | topicDetail := &sarama.TopicDetail{} |
| 254 | topicDetail.NumPartitions = int32(numPartition) |
| 255 | topicDetail.ReplicationFactor = int16(repFactor) |
| 256 | topicDetail.ConfigEntries = make(map[string]*string) |
| 257 | topicDetails := make(map[string]*sarama.TopicDetail) |
| 258 | topicDetails[topic.Name] = topicDetail |
| 259 | |
| 260 | if err := sc.cAdmin.CreateTopic(topic.Name, topicDetail, false); err != nil { |
| 261 | if err == sarama.ErrTopicAlreadyExists { |
| 262 | // Not an error |
| 263 | log.Debugw("topic-already-exist", log.Fields{"topic": topic.Name}) |
| 264 | return nil |
| 265 | } |
| 266 | log.Errorw("create-topic-failure", log.Fields{"error": err}) |
| 267 | return err |
| 268 | } |
| 269 | // TODO: Wait until the topic has been created. No API is available in the Sarama clusterAdmin to |
| 270 | // do so. |
| 271 | log.Debugw("topic-created", log.Fields{"topic": topic, "numPartition": numPartition, "replicationFactor": repFactor}) |
| 272 | return nil |
| 273 | } |
| 274 | |
| 275 | //DeleteTopic removes a topic from the kafka Broker |
| 276 | func (sc *SaramaClient) DeleteTopic(topic *Topic) error { |
| 277 | // Remove the topic from the broker |
| 278 | if err := sc.cAdmin.DeleteTopic(topic.Name); err != nil { |
| 279 | if err == sarama.ErrUnknownTopicOrPartition { |
| 280 | // Not an error as does not exist |
| 281 | log.Debugw("topic-not-exist", log.Fields{"topic": topic.Name}) |
| 282 | return nil |
| 283 | } |
| 284 | log.Errorw("delete-topic-failed", log.Fields{"topic": topic, "error": err}) |
| 285 | return err |
| 286 | } |
| 287 | |
| 288 | // Clear the topic from the consumer channel. This will also close any consumers listening on that topic. |
| 289 | if err := sc.clearTopicFromConsumerChannelMap(*topic); err != nil { |
| 290 | log.Errorw("failure-clearing-channels", log.Fields{"topic": topic, "error": err}) |
| 291 | return err |
| 292 | } |
| 293 | return nil |
| 294 | } |
| 295 | |
| 296 | // Subscribe registers a caller to a topic. It returns a channel that the caller can use to receive |
| 297 | // messages from that topic |
| 298 | func (sc *SaramaClient) Subscribe(topic *Topic) (<-chan *ca.InterContainerMessage, error) { |
| 299 | log.Debugw("subscribe", log.Fields{"topic": topic.Name}) |
| 300 | |
| 301 | // If a consumers already exist for that topic then resuse it |
| 302 | if consumerCh := sc.getConsumerChannel(topic); consumerCh != nil { |
| 303 | log.Debugw("topic-already-subscribed", log.Fields{"topic": topic.Name}) |
| 304 | // Create a channel specific for that consumers and add it to the consumers channel map |
| 305 | ch := make(chan *ca.InterContainerMessage) |
| 306 | sc.addChannelToConsumerChannelMap(topic, ch) |
| 307 | return ch, nil |
| 308 | } |
| 309 | |
| 310 | // Register for the topic and set it up |
| 311 | var consumerListeningChannel chan *ca.InterContainerMessage |
| 312 | var err error |
| 313 | |
| 314 | // Use the consumerType option to figure out the type of consumer to launch |
| 315 | if sc.consumerType == PartitionConsumer { |
| 316 | if sc.autoCreateTopic { |
| 317 | if err = sc.CreateTopic(topic, sc.numPartitions, sc.numReplicas); err != nil { |
| 318 | log.Errorw("create-topic-failure", log.Fields{"error": err, "topic": topic.Name}) |
| 319 | return nil, err |
| 320 | } |
| 321 | } |
| 322 | if consumerListeningChannel, err = sc.setupPartitionConsumerChannel(topic, sarama.OffsetNewest); err != nil { |
| 323 | log.Warnw("create-consumers-channel-failure", log.Fields{"error": err, "topic": topic.Name}) |
| 324 | return nil, err |
| 325 | } |
| 326 | } else if sc.consumerType == GroupCustomer { |
| 327 | // TODO: create topic if auto create is on. There is an issue with the sarama cluster library that |
| 328 | // does not consume from a precreated topic in some scenarios |
| 329 | if consumerListeningChannel, err = sc.setupGroupConsumerChannel(topic, "mytest"); err != nil { |
| 330 | log.Warnw("create-consumers-channel-failure", log.Fields{"error": err, "topic": topic.Name}) |
| 331 | return nil, err |
| 332 | } |
| 333 | } else { |
| 334 | log.Warnw("unknown-consumer-type", log.Fields{"consumer-type": sc.consumerType}) |
| 335 | return nil, errors.New("unknown-consumer-type") |
| 336 | } |
| 337 | |
| 338 | return consumerListeningChannel, nil |
| 339 | } |
| 340 | |
| 341 | //UnSubscribe unsubscribe a consumer from a given topic |
| 342 | func (sc *SaramaClient) UnSubscribe(topic *Topic, ch <-chan *ca.InterContainerMessage) error { |
| 343 | log.Debugw("unsubscribing-channel-from-topic", log.Fields{"topic": topic.Name}) |
| 344 | err := sc.removeChannelFromConsumerChannelMap(*topic, ch) |
| 345 | return err |
| 346 | } |
| 347 | |
| 348 | // send formats and sends the request onto the kafka messaging bus. |
| 349 | func (sc *SaramaClient) Send(msg interface{}, topic *Topic, keys ...string) error { |
| 350 | |
| 351 | // Assert message is a proto message |
| 352 | var protoMsg proto.Message |
| 353 | var ok bool |
| 354 | // ascertain the value interface type is a proto.Message |
| 355 | if protoMsg, ok = msg.(proto.Message); !ok { |
| 356 | log.Warnw("message-not-proto-message", log.Fields{"msg": msg}) |
| 357 | return errors.New(fmt.Sprintf("not-a-proto-msg-%s", msg)) |
| 358 | } |
| 359 | |
| 360 | var marshalled []byte |
| 361 | var err error |
| 362 | // Create the Sarama producer message |
| 363 | if marshalled, err = proto.Marshal(protoMsg); err != nil { |
| 364 | log.Errorw("marshalling-failed", log.Fields{"msg": protoMsg, "error": err}) |
| 365 | return err |
| 366 | } |
| 367 | key := "" |
| 368 | if len(keys) > 0 { |
| 369 | key = keys[0] // Only the first key is relevant |
| 370 | } |
| 371 | kafkaMsg := &sarama.ProducerMessage{ |
| 372 | Topic: topic.Name, |
| 373 | Key: sarama.StringEncoder(key), |
| 374 | Value: sarama.ByteEncoder(marshalled), |
| 375 | } |
| 376 | |
| 377 | // Send message to kafka |
| 378 | sc.producer.Input() <- kafkaMsg |
| 379 | return nil |
| 380 | } |
| 381 | |
| 382 | func (sc *SaramaClient) createClusterAdmin() error { |
| 383 | kafkaFullAddr := fmt.Sprintf("%s:%d", sc.KafkaHost, sc.KafkaPort) |
| 384 | config := sarama.NewConfig() |
| 385 | config.Version = sarama.V1_0_0_0 |
| 386 | |
| 387 | // Create a cluster Admin |
| 388 | var cAdmin sarama.ClusterAdmin |
| 389 | var err error |
| 390 | if cAdmin, err = sarama.NewClusterAdmin([]string{kafkaFullAddr}, config); err != nil { |
| 391 | log.Errorw("cluster-admin-failure", log.Fields{"error": err, "broker-address": kafkaFullAddr}) |
| 392 | return err |
| 393 | } |
| 394 | sc.cAdmin = cAdmin |
| 395 | return nil |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 396 | } |
| 397 | |
| 398 | func (sc *SaramaClient) addTopicToConsumerChannelMap(id string, arg *consumerChannels) { |
| 399 | sc.lockTopicToConsumerChannelMap.Lock() |
| 400 | defer sc.lockTopicToConsumerChannelMap.Unlock() |
| 401 | if _, exist := sc.topicToConsumerChannelMap[id]; !exist { |
| 402 | sc.topicToConsumerChannelMap[id] = arg |
| 403 | } |
| 404 | } |
| 405 | |
| 406 | func (sc *SaramaClient) deleteFromTopicToConsumerChannelMap(id string) { |
| 407 | sc.lockTopicToConsumerChannelMap.Lock() |
| 408 | defer sc.lockTopicToConsumerChannelMap.Unlock() |
| 409 | if _, exist := sc.topicToConsumerChannelMap[id]; exist { |
| 410 | delete(sc.topicToConsumerChannelMap, id) |
| 411 | } |
| 412 | } |
| 413 | |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 414 | func (sc *SaramaClient) getConsumerChannel(topic *Topic) *consumerChannels { |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 415 | sc.lockTopicToConsumerChannelMap.Lock() |
| 416 | defer sc.lockTopicToConsumerChannelMap.Unlock() |
| 417 | |
| 418 | if consumerCh, exist := sc.topicToConsumerChannelMap[topic.Name]; exist { |
| 419 | return consumerCh |
| 420 | } |
| 421 | return nil |
| 422 | } |
| 423 | |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 424 | func (sc *SaramaClient) addChannelToConsumerChannelMap(topic *Topic, ch chan *ca.InterContainerMessage) { |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 425 | sc.lockTopicToConsumerChannelMap.Lock() |
| 426 | defer sc.lockTopicToConsumerChannelMap.Unlock() |
| 427 | if consumerCh, exist := sc.topicToConsumerChannelMap[topic.Name]; exist { |
| 428 | consumerCh.channels = append(consumerCh.channels, ch) |
| 429 | return |
| 430 | } |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 431 | log.Warnw("consumers-channel-not-exist", log.Fields{"topic": topic.Name}) |
| 432 | } |
| 433 | |
| 434 | //closeConsumers closes a list of sarama consumers. The consumers can either be a partition consumers or a group consumers |
| 435 | func closeConsumers(consumers []interface{}) error { |
| 436 | var err error |
| 437 | for _, consumer := range consumers { |
| 438 | // Is it a partition consumers? |
| 439 | if partionConsumer, ok := consumer.(sarama.PartitionConsumer); ok { |
| 440 | if errTemp := partionConsumer.Close(); errTemp != nil { |
| 441 | log.Debugw("partition!!!", log.Fields{"err": errTemp}) |
| 442 | if strings.Compare(errTemp.Error(), sarama.ErrUnknownTopicOrPartition.Error()) == 0 { |
| 443 | // This can occur on race condition |
| 444 | err = nil |
| 445 | } else { |
| 446 | err = errTemp |
| 447 | } |
| 448 | } |
| 449 | } else if groupConsumer, ok := consumer.(*scc.Consumer); ok { |
| 450 | if errTemp := groupConsumer.Close(); errTemp != nil { |
| 451 | if strings.Compare(errTemp.Error(), sarama.ErrUnknownTopicOrPartition.Error()) == 0 { |
| 452 | // This can occur on race condition |
| 453 | err = nil |
| 454 | } else { |
| 455 | err = errTemp |
| 456 | } |
| 457 | } |
| 458 | } |
| 459 | } |
| 460 | return err |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 461 | } |
| 462 | |
| 463 | func (sc *SaramaClient) removeChannelFromConsumerChannelMap(topic Topic, ch <-chan *ca.InterContainerMessage) error { |
| 464 | sc.lockTopicToConsumerChannelMap.Lock() |
| 465 | defer sc.lockTopicToConsumerChannelMap.Unlock() |
| 466 | if consumerCh, exist := sc.topicToConsumerChannelMap[topic.Name]; exist { |
| 467 | // Channel will be closed in the removeChannel method |
| 468 | consumerCh.channels = removeChannel(consumerCh.channels, ch) |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 469 | // If there are no more channels then we can close the consumers itself |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 470 | if len(consumerCh.channels) == 0 { |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 471 | log.Debugw("closing-consumers", log.Fields{"topic": topic}) |
| 472 | err := closeConsumers(consumerCh.consumers) |
| 473 | //err := consumerCh.consumers.Close() |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 474 | delete(sc.topicToConsumerChannelMap, topic.Name) |
| 475 | return err |
| 476 | } |
| 477 | return nil |
| 478 | } |
| 479 | log.Warnw("topic-does-not-exist", log.Fields{"topic": topic.Name}) |
| 480 | return errors.New("topic-does-not-exist") |
| 481 | } |
| 482 | |
| 483 | func (sc *SaramaClient) clearTopicFromConsumerChannelMap(topic Topic) error { |
| 484 | sc.lockTopicToConsumerChannelMap.Lock() |
| 485 | defer sc.lockTopicToConsumerChannelMap.Unlock() |
| 486 | if consumerCh, exist := sc.topicToConsumerChannelMap[topic.Name]; exist { |
| 487 | for _, ch := range consumerCh.channels { |
| 488 | // Channel will be closed in the removeChannel method |
| 489 | removeChannel(consumerCh.channels, ch) |
| 490 | } |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 491 | err := closeConsumers(consumerCh.consumers) |
| 492 | //if err == sarama.ErrUnknownTopicOrPartition { |
| 493 | // // Not an error |
| 494 | // err = nil |
| 495 | //} |
| 496 | //err := consumerCh.consumers.Close() |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 497 | delete(sc.topicToConsumerChannelMap, topic.Name) |
| 498 | return err |
| 499 | } |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 500 | log.Debugw("topic-does-not-exist", log.Fields{"topic": topic.Name}) |
| 501 | return nil |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 502 | } |
| 503 | |
| 504 | func (sc *SaramaClient) clearConsumerChannelMap() error { |
| 505 | sc.lockTopicToConsumerChannelMap.Lock() |
| 506 | defer sc.lockTopicToConsumerChannelMap.Unlock() |
| 507 | var err error |
| 508 | for topic, consumerCh := range sc.topicToConsumerChannelMap { |
| 509 | for _, ch := range consumerCh.channels { |
| 510 | // Channel will be closed in the removeChannel method |
| 511 | removeChannel(consumerCh.channels, ch) |
| 512 | } |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 513 | if errTemp := closeConsumers(consumerCh.consumers); errTemp != nil { |
| 514 | err = errTemp |
| 515 | } |
| 516 | //err = consumerCh.consumers.Close() |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 517 | delete(sc.topicToConsumerChannelMap, topic) |
| 518 | } |
| 519 | return err |
| 520 | } |
| 521 | |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 522 | //createPublisher creates the publisher which is used to send a message onto kafka |
| 523 | func (sc *SaramaClient) createPublisher() error { |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 524 | // This Creates the publisher |
| 525 | config := sarama.NewConfig() |
| 526 | config.Producer.Partitioner = sarama.NewRandomPartitioner |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 527 | config.Producer.Flush.Frequency = time.Duration(sc.producerFlushFrequency) |
| 528 | config.Producer.Flush.Messages = sc.producerFlushMessages |
| 529 | config.Producer.Flush.MaxMessages = sc.producerFlushMaxmessages |
| 530 | config.Producer.Return.Errors = sc.producerReturnErrors |
| 531 | config.Producer.Return.Successes = sc.producerReturnSuccess |
| 532 | //config.Producer.RequiredAcks = sarama.WaitForAll |
| 533 | config.Producer.RequiredAcks = sarama.WaitForLocal |
| 534 | |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 535 | kafkaFullAddr := fmt.Sprintf("%s:%d", sc.KafkaHost, sc.KafkaPort) |
| 536 | brokers := []string{kafkaFullAddr} |
| 537 | |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 538 | if producer, err := sarama.NewAsyncProducer(brokers, config); err != nil { |
| 539 | log.Errorw("error-starting-publisher", log.Fields{"error": err}) |
| 540 | return err |
| 541 | } else { |
| 542 | sc.producer = producer |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 543 | } |
| 544 | log.Info("Kafka-publisher-created") |
| 545 | return nil |
| 546 | } |
| 547 | |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 548 | func (sc *SaramaClient) createConsumer() error { |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 549 | config := sarama.NewConfig() |
| 550 | config.Consumer.Return.Errors = true |
| 551 | config.Consumer.Fetch.Min = 1 |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 552 | config.Consumer.MaxWaitTime = time.Duration(sc.consumerMaxwait) * time.Millisecond |
| 553 | config.Consumer.MaxProcessingTime = time.Duration(sc.maxProcessingTime) * time.Millisecond |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 554 | config.Consumer.Offsets.Initial = sarama.OffsetNewest |
| 555 | kafkaFullAddr := fmt.Sprintf("%s:%d", sc.KafkaHost, sc.KafkaPort) |
| 556 | brokers := []string{kafkaFullAddr} |
| 557 | |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 558 | if consumer, err := sarama.NewConsumer(brokers, config); err != nil { |
| 559 | log.Errorw("error-starting-consumers", log.Fields{"error": err}) |
| 560 | return err |
| 561 | } else { |
| 562 | sc.consumer = consumer |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 563 | } |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 564 | log.Info("Kafka-consumers-created") |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 565 | return nil |
| 566 | } |
| 567 | |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 568 | // createGroupConsumer creates a consumers group |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 569 | func (sc *SaramaClient) createGroupConsumer(topic *Topic, groupId *string, retries int) (*scc.Consumer, error) { |
| 570 | config := scc.NewConfig() |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 571 | config.ClientID = uuid.New().String() |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 572 | config.Group.Mode = scc.ConsumerModeMultiplex |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 573 | //config.Consumer.Return.Errors = true |
| 574 | //config.Group.Return.Notifications = false |
| 575 | //config.Consumer.MaxWaitTime = time.Duration(DefaultConsumerMaxwait) * time.Millisecond |
| 576 | //config.Consumer.MaxProcessingTime = time.Duration(DefaultMaxProcessingTime) * time.Millisecond |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 577 | config.Consumer.Offsets.Initial = sarama.OffsetNewest |
| 578 | kafkaFullAddr := fmt.Sprintf("%s:%d", sc.KafkaHost, sc.KafkaPort) |
| 579 | brokers := []string{kafkaFullAddr} |
| 580 | |
| 581 | if groupId == nil { |
| 582 | g := DefaultGroupName |
| 583 | groupId = &g |
| 584 | } |
| 585 | topics := []string{topic.Name} |
| 586 | var consumer *scc.Consumer |
| 587 | var err error |
| 588 | |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 589 | if consumer, err = scc.NewConsumer(brokers, *groupId, topics, config); err != nil { |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 590 | log.Errorw("create-consumers-failure", log.Fields{"error": err, "topic": topic.Name, "groupId": groupId}) |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 591 | return nil, err |
| 592 | } |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 593 | log.Debugw("create-consumers-success", log.Fields{"topic": topic.Name, "groupId": groupId}) |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 594 | //time.Sleep(10*time.Second) |
| 595 | sc.groupConsumer = consumer |
| 596 | return consumer, nil |
| 597 | } |
| 598 | |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 599 | // dispatchToConsumers sends the intercontainermessage received on a given topic to all subscribers for that |
| 600 | // topic via the unique channel each subsciber received during subscription |
| 601 | func (sc *SaramaClient) dispatchToConsumers(consumerCh *consumerChannels, protoMessage *ca.InterContainerMessage) { |
| 602 | // Need to go over all channels and publish messages to them - do we need to copy msg? |
| 603 | sc.lockTopicToConsumerChannelMap.Lock() |
| 604 | defer sc.lockTopicToConsumerChannelMap.Unlock() |
| 605 | for _, ch := range consumerCh.channels { |
| 606 | go func(c chan *ca.InterContainerMessage) { |
| 607 | c <- protoMessage |
| 608 | }(ch) |
| 609 | } |
| 610 | } |
| 611 | |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 612 | func (sc *SaramaClient) consumeFromAPartition(topic *Topic, consumer sarama.PartitionConsumer, consumerChnls *consumerChannels) { |
| 613 | log.Debugw("starting-partition-consumption-loop", log.Fields{"topic": topic.Name}) |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 614 | startloop: |
| 615 | for { |
| 616 | select { |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 617 | case err := <-consumer.Errors(): |
| 618 | if err != nil { |
| 619 | log.Warnw("partition-consumers-error", log.Fields{"error": err}) |
| 620 | } else { |
| 621 | // There is a race condition when this loop is stopped and the consumer is closed where |
| 622 | // the actual error comes as nil |
| 623 | log.Warn("partition-consumers-error") |
| 624 | } |
| 625 | case msg := <-consumer.Messages(): |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 626 | //log.Debugw("message-received", log.Fields{"msg": msg, "receivedTopic": msg.Topic}) |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 627 | if msg == nil { |
| 628 | // There is a race condition when this loop is stopped and the consumer is closed where |
| 629 | // the actual msg comes as nil |
| 630 | break startloop |
| 631 | } |
| 632 | msgBody := msg.Value |
| 633 | icm := &ca.InterContainerMessage{} |
| 634 | if err := proto.Unmarshal(msgBody, icm); err != nil { |
| 635 | log.Warnw("partition-invalid-message", log.Fields{"error": err}) |
| 636 | continue |
| 637 | } |
| 638 | go sc.dispatchToConsumers(consumerChnls, icm) |
| 639 | case <-sc.doneCh: |
| 640 | log.Infow("partition-received-exit-signal", log.Fields{"topic": topic.Name}) |
| 641 | break startloop |
| 642 | } |
| 643 | } |
| 644 | log.Infow("partition-consumer-stopped", log.Fields{"topic": topic.Name}) |
| 645 | } |
| 646 | |
| 647 | func (sc *SaramaClient) consumeGroupMessages(topic *Topic, consumer *scc.Consumer, consumerChnls *consumerChannels) { |
| 648 | log.Debugw("starting-group-consumption-loop", log.Fields{"topic": topic.Name}) |
| 649 | |
| 650 | startloop: |
| 651 | for { |
| 652 | select { |
| 653 | case err := <-consumer.Errors(): |
| 654 | if err != nil { |
| 655 | log.Warnw("group-consumers-error", log.Fields{"error": err}) |
| 656 | } else { |
| 657 | // There is a race condition when this loop is stopped and the consumer is closed where |
| 658 | // the actual error comes as nil |
| 659 | log.Warn("group-consumers-error") |
| 660 | } |
| 661 | case msg := <-consumer.Messages(): |
| 662 | //log.Debugw("message-received", log.Fields{"msg": msg, "receivedTopic": msg.Topic}) |
| 663 | if msg == nil { |
| 664 | // There is a race condition when this loop is stopped and the consumer is closed where |
| 665 | // the actual msg comes as nil |
| 666 | break startloop |
| 667 | } |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 668 | msgBody := msg.Value |
| 669 | icm := &ca.InterContainerMessage{} |
| 670 | if err := proto.Unmarshal(msgBody, icm); err != nil { |
| 671 | log.Warnw("invalid-message", log.Fields{"error": err}) |
| 672 | continue |
| 673 | } |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 674 | go sc.dispatchToConsumers(consumerChnls, icm) |
| 675 | consumer.MarkOffset(msg, "") |
| 676 | case ntf := <-consumer.Notifications(): |
| 677 | log.Debugw("group-received-notification", log.Fields{"notification": ntf}) |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 678 | case <-sc.doneCh: |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 679 | log.Infow("group-received-exit-signal", log.Fields{"topic": topic.Name}) |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 680 | break startloop |
| 681 | } |
| 682 | } |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 683 | log.Infow("group-consumer-stopped", log.Fields{"topic": topic.Name}) |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 684 | } |
| 685 | |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 686 | func (sc *SaramaClient) startConsumers(topic *Topic) error { |
| 687 | log.Debugw("starting-consumers", log.Fields{"topic": topic.Name}) |
| 688 | var consumerCh *consumerChannels |
| 689 | if consumerCh = sc.getConsumerChannel(topic); consumerCh == nil { |
| 690 | log.Errorw("consumers-not-exist", log.Fields{"topic": topic.Name}) |
| 691 | return errors.New("consumers-not-exist") |
| 692 | } |
| 693 | // For each consumer listening for that topic, start a consumption loop |
| 694 | for _, consumer := range consumerCh.consumers { |
| 695 | if pConsumer, ok := consumer.(sarama.PartitionConsumer); ok { |
| 696 | go sc.consumeFromAPartition(topic, pConsumer, consumerCh) |
| 697 | } else if gConsumer, ok := consumer.(*scc.Consumer); ok { |
| 698 | go sc.consumeGroupMessages(topic, gConsumer, consumerCh) |
| 699 | } else { |
| 700 | log.Errorw("invalid-consumer", log.Fields{"topic": topic}) |
| 701 | return errors.New("invalid-consumer") |
| 702 | } |
| 703 | } |
| 704 | return nil |
| 705 | } |
| 706 | |
| 707 | //// setupConsumerChannel creates a consumerChannels object for that topic and add it to the consumerChannels map |
| 708 | //// for that topic. It also starts the routine that listens for messages on that topic. |
| 709 | func (sc *SaramaClient) setupPartitionConsumerChannel(topic *Topic, initialOffset int64) (chan *ca.InterContainerMessage, error) { |
| 710 | var pConsumers []sarama.PartitionConsumer |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 711 | var err error |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 712 | |
| 713 | if pConsumers, err = sc.createPartionConsumers(topic, initialOffset); err != nil { |
| 714 | log.Errorw("creating-partition-consumers-failure", log.Fields{"error": err, "topic": topic.Name}) |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 715 | return nil, err |
| 716 | } |
| 717 | |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 718 | consumersIf := make([]interface{}, 0) |
| 719 | for _, pConsumer := range pConsumers { |
| 720 | consumersIf = append(consumersIf, pConsumer) |
| 721 | } |
| 722 | |
| 723 | // Create the consumers/channel structure and set the consumers and create a channel on that topic - for now |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 724 | // unbuffered to verify race conditions. |
| 725 | consumerListeningChannel := make(chan *ca.InterContainerMessage) |
| 726 | cc := &consumerChannels{ |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 727 | consumers: consumersIf, |
| 728 | channels: []chan *ca.InterContainerMessage{consumerListeningChannel}, |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 729 | } |
| 730 | |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 731 | // Add the consumers channel to the map |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 732 | sc.addTopicToConsumerChannelMap(topic.Name, cc) |
| 733 | |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 734 | //Start a consumers to listen on that specific topic |
| 735 | go sc.startConsumers(topic) |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 736 | |
| 737 | return consumerListeningChannel, nil |
| 738 | } |
| 739 | |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 740 | // setupConsumerChannel creates a consumerChannels object for that topic and add it to the consumerChannels map |
| 741 | // for that topic. It also starts the routine that listens for messages on that topic. |
| 742 | func (sc *SaramaClient) setupGroupConsumerChannel(topic *Topic, groupId string) (chan *ca.InterContainerMessage, error) { |
| 743 | // TODO: Replace this development partition consumers with a group consumers |
| 744 | var pConsumer *scc.Consumer |
| 745 | var err error |
| 746 | if pConsumer, err = sc.createGroupConsumer(topic, &groupId, DefaultMaxRetries); err != nil { |
| 747 | log.Errorw("creating-partition-consumers-failure", log.Fields{"error": err, "topic": topic.Name}) |
| 748 | return nil, err |
| 749 | } |
| 750 | // Create the consumers/channel structure and set the consumers and create a channel on that topic - for now |
| 751 | // unbuffered to verify race conditions. |
| 752 | consumerListeningChannel := make(chan *ca.InterContainerMessage) |
| 753 | cc := &consumerChannels{ |
| 754 | consumers: []interface{}{pConsumer}, |
| 755 | channels: []chan *ca.InterContainerMessage{consumerListeningChannel}, |
| 756 | } |
| 757 | |
| 758 | // Add the consumers channel to the map |
| 759 | sc.addTopicToConsumerChannelMap(topic.Name, cc) |
| 760 | |
| 761 | //Start a consumers to listen on that specific topic |
| 762 | go sc.startConsumers(topic) |
| 763 | |
| 764 | return consumerListeningChannel, nil |
| 765 | } |
| 766 | |
| 767 | func (sc *SaramaClient) createPartionConsumers(topic *Topic, initialOffset int64) ([]sarama.PartitionConsumer, error) { |
| 768 | log.Debugw("creating-partition-consumers", log.Fields{"topic": topic.Name}) |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 769 | partitionList, err := sc.consumer.Partitions(topic.Name) |
| 770 | if err != nil { |
| 771 | log.Warnw("get-partition-failure", log.Fields{"error": err, "topic": topic.Name}) |
| 772 | return nil, err |
| 773 | } |
| 774 | |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 775 | pConsumers := make([]sarama.PartitionConsumer, 0) |
| 776 | for _, partition := range partitionList { |
| 777 | var pConsumer sarama.PartitionConsumer |
| 778 | if pConsumer, err = sc.consumer.ConsumePartition(topic.Name, partition, initialOffset); err != nil { |
| 779 | log.Warnw("consumers-partition-failure", log.Fields{"error": err, "topic": topic.Name}) |
| 780 | return nil, err |
| 781 | } |
| 782 | pConsumers = append(pConsumers, pConsumer) |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 783 | } |
khenaidoo | 4c1a5bf | 2018-11-29 15:53:42 -0500 | [diff] [blame^] | 784 | return pConsumers, nil |
khenaidoo | 43c8212 | 2018-11-22 18:38:28 -0500 | [diff] [blame] | 785 | } |
| 786 | |
| 787 | func removeChannel(channels []chan *ca.InterContainerMessage, ch <-chan *ca.InterContainerMessage) []chan *ca.InterContainerMessage { |
| 788 | var i int |
| 789 | var channel chan *ca.InterContainerMessage |
| 790 | for i, channel = range channels { |
| 791 | if channel == ch { |
| 792 | channels[len(channels)-1], channels[i] = channels[i], channels[len(channels)-1] |
| 793 | close(channel) |
| 794 | return channels[:len(channels)-1] |
| 795 | } |
| 796 | } |
| 797 | return channels |
| 798 | } |