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Feb 29, 2020
Merged

Support for assign() #123

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11 changes: 9 additions & 2 deletions src/Kafka/Consumer.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@ module Kafka.Consumer
( module X
, runConsumer
, newConsumer
, assignment, subscription
, assign, assignment, subscription
, pausePartitions, resumePartitions
, committed, position, seek
, pollMessage, pollConsumerEvents
Expand Down Expand Up @@ -37,7 +37,7 @@ import qualified Data.Text as Text
import Foreign hiding (void)
import Kafka.Consumer.Convert (fromMessagePtr, fromNativeTopicPartitionList'', offsetCommitToBool, offsetToInt64, toMap, toNativeTopicPartitionList, toNativeTopicPartitionList', toNativeTopicPartitionListNoDispose, topicPartitionFromMessageForCommit)
import Kafka.Consumer.Types (KafkaConsumer (..))
import Kafka.Internal.RdKafka (RdKafkaRespErrT (..), RdKafkaTopicPartitionListTPtr, RdKafkaTypeT (..), newRdKafkaT, newRdKafkaTopicPartitionListT, newRdKafkaTopicT, rdKafkaAssignment, rdKafkaCommit, rdKafkaCommitted, rdKafkaConfSetDefaultTopicConf, rdKafkaConsumeBatchQueue, rdKafkaConsumeQueue, rdKafkaConsumerClose, rdKafkaConsumerPoll, rdKafkaOffsetsStore, rdKafkaPausePartitions, rdKafkaPollSetConsumer, rdKafkaPosition, rdKafkaQueueDestroy, rdKafkaQueueNew, rdKafkaResumePartitions, rdKafkaSeek, rdKafkaSetLogLevel, rdKafkaSubscribe, rdKafkaSubscription, rdKafkaTopicConfDup, rdKafkaTopicPartitionListAdd)
import Kafka.Internal.RdKafka (RdKafkaRespErrT (..), RdKafkaTopicPartitionListTPtr, RdKafkaTypeT (..), newRdKafkaT, newRdKafkaTopicPartitionListT, newRdKafkaTopicT, rdKafkaAssign, rdKafkaAssignment, rdKafkaCommit, rdKafkaCommitted, rdKafkaConfSetDefaultTopicConf, rdKafkaConsumeBatchQueue, rdKafkaConsumeQueue, rdKafkaConsumerClose, rdKafkaConsumerPoll, rdKafkaOffsetsStore, rdKafkaPausePartitions, rdKafkaPollSetConsumer, rdKafkaPosition, rdKafkaQueueDestroy, rdKafkaQueueNew, rdKafkaResumePartitions, rdKafkaSeek, rdKafkaSetLogLevel, rdKafkaSubscribe, rdKafkaSubscription, rdKafkaTopicConfDup, rdKafkaTopicPartitionListAdd)
import Kafka.Internal.Setup (CallbackPollStatus (..), Kafka (..), KafkaConf (..), KafkaProps (..), TopicConf (..), TopicProps (..), getKafkaConf, getRdKafka, kafkaConf, topicConf)
import Kafka.Internal.Shared (kafkaErrorToMaybe, maybeToLeft, rdKafkaErrorToEither)

Expand Down Expand Up @@ -163,6 +163,13 @@ commitPartitionsOffsets :: MonadIO m
commitPartitionsOffsets o k ps =
liftIO $ toNativeTopicPartitionList ps >>= commitOffsets o k

-- | Assigns the consumer to consume from the given topics, partitions,
-- and offsets.
assign :: MonadIO m => KafkaConsumer -> [TopicPartition] -> m (Maybe KafkaError)
assign (KafkaConsumer (Kafka k) _) ps = liftIO $ do
tps <- toNativeTopicPartitionList ps
kafkaErrorToMaybe . KafkaResponseError <$> rdKafkaAssign k tps

-- | Returns current consumer's assignment
assignment :: MonadIO m => KafkaConsumer -> m (Either KafkaError (M.Map TopicName [PartitionId]))
assignment (KafkaConsumer (Kafka k) _) = liftIO $ do
Expand Down