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PubsubGoogleConsumer.scala
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PubsubGoogleConsumer.scala
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/*
* Copyright 2018 Permutive
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.permutive.pubsub.consumer.grpc
import cats.Applicative
import cats.effect.kernel.Sync
import cats.syntax.all._
import com.google.pubsub.v1.PubsubMessage
import com.permutive.pubsub.consumer.decoder.MessageDecoder
import com.permutive.pubsub.consumer.grpc.internal.PubsubSubscriber
import com.permutive.pubsub.consumer.{ConsumerRecord, Model}
import fs2.Stream
import scala.jdk.CollectionConverters._
import scala.util.control.NoStackTrace
object PubsubGoogleConsumer {
/** Indicates the underlying Java PubSub consumer has failed.
*
* @param cause the cause of the failure
*/
case class InternalPubSubError(cause: Throwable)
extends Throwable("Internal Java PubSub consumer failed", cause)
with NoStackTrace
/** Subscribe with manual acknowledgement
*
* The stream fails with an [[InternalPubSubError]] if the underlying Java consumer fails.
*
* @param projectId google cloud project id
* @param subscription name of the subscription
* @param errorHandler upon failure to decode, an exception is thrown. Allows acknowledging the message.
*/
final def subscribe[F[_]: Sync, A: MessageDecoder](
projectId: Model.ProjectId,
subscription: Model.Subscription,
errorHandler: (PubsubMessage, Throwable, F[Unit], F[Unit]) => F[Unit],
config: PubsubGoogleConsumerConfig[F]
): Stream[F, ConsumerRecord[F, A]] =
subscribeDecode[F, A, ConsumerRecord[F, A]](
projectId,
subscription,
errorHandler,
config,
onDecode = (record, value) =>
Applicative[F].pure(
ConsumerRecord(
value,
record.value.getAttributesMap.asScala.toMap,
record.ack,
record.nack,
_ => Applicative[F].unit
)
),
)
/** Subscribe with automatic acknowledgement
*
* The stream fails with an [[InternalPubSubError]] if the underlying Java consumer fails.
*
* @param projectId google cloud project id
* @param subscription name of the subscription
* @param errorHandler upon failure to decode, an exception is thrown. Allows acknowledging the message.
*/
final def subscribeAndAck[F[_]: Sync, A: MessageDecoder](
projectId: Model.ProjectId,
subscription: Model.Subscription,
errorHandler: (PubsubMessage, Throwable, F[Unit], F[Unit]) => F[Unit],
config: PubsubGoogleConsumerConfig[F]
): Stream[F, A] =
subscribeDecode[F, A, A](
projectId,
subscription,
errorHandler,
config,
onDecode = (record, value) => record.ack.as(value),
)
/** Subscribe to the raw stream, receiving the the message as retrieved from PubSub
*
* The stream fails with an [[InternalPubSubError]] if the underlying Java consumer fails.
*/
final def subscribeRaw[F[_]: Sync](
projectId: Model.ProjectId,
subscription: Model.Subscription,
config: PubsubGoogleConsumerConfig[F]
): Stream[F, ConsumerRecord[F, PubsubMessage]] =
PubsubSubscriber
.subscribe(projectId, subscription, config)
.map(msg =>
ConsumerRecord(msg.value, msg.value.getAttributesMap.asScala.toMap, msg.ack, msg.nack, _ => Applicative[F].unit)
)
private def subscribeDecode[F[_]: Sync, A: MessageDecoder, B](
projectId: Model.ProjectId,
subscription: Model.Subscription,
errorHandler: (PubsubMessage, Throwable, F[Unit], F[Unit]) => F[Unit],
config: PubsubGoogleConsumerConfig[F],
onDecode: (internal.Model.Record[F], A) => F[B],
): Stream[F, B] =
PubsubSubscriber
.subscribe(projectId, subscription, config)
.evalMapChunk[F, Option[B]](record =>
MessageDecoder[A].decode(record.value.getData.toByteArray) match {
case Left(e) => errorHandler(record.value, e, record.ack, record.ack).as(None)
case Right(v) => onDecode(record, v).map(Some(_))
}
)
.unNone
}