From d967ca5b62bd790f0ff750d2f94e3f392cc1f8ad Mon Sep 17 00:00:00 2001
From: vlad <vlad@driver.xyz>
Date: Thu, 6 Jul 2017 14:59:36 -0700
Subject: Generic messages for PubSub

---
 src/main/scala/xyz/driver/core/pubsub.scala | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

(limited to 'src/main/scala/xyz')

diff --git a/src/main/scala/xyz/driver/core/pubsub.scala b/src/main/scala/xyz/driver/core/pubsub.scala
index 9851383..a4de51b 100644
--- a/src/main/scala/xyz/driver/core/pubsub.scala
+++ b/src/main/scala/xyz/driver/core/pubsub.scala
@@ -1,6 +1,8 @@
 package xyz.driver.core
 
 import akka.http.scaladsl.marshalling._
+import akka.http.scaladsl.unmarshalling.{Unmarshal, Unmarshaller}
+import akka.stream.Materializer
 import com.google.api.core.{ApiFutureCallback, ApiFutures}
 import com.google.cloud.pubsub.spi.v1.{AckReplyConsumer, MessageReceiver, Publisher, Subscriber}
 import com.google.protobuf.ByteString
@@ -21,7 +23,7 @@ object pubsub {
 
   class GooglePubsubPublisher[Message](projectId: String, topicName: String, log: Logger)(
           implicit messageMarshaller: Marshaller[Message, Array[Byte]],
-          executionContext: ExecutionContext
+          ex: ExecutionContext
   ) extends PubsubPublisher[Message] {
 
     type Result = Id[PubsubMessage]
@@ -63,19 +65,25 @@ object pubsub {
     def stopListening(): Unit
   }
 
-  class GooglePubsubSubscriber[T](projectId: String,
-                                  subscriptionId: String,
-                                  receiver: String => Future[T],
-                                  log: Logger)(implicit ex: ExecutionContext)
+  class GooglePubsubSubscriber[Message, Result](projectId: String,
+                                                subscriptionId: String,
+                                                receiver: Message => Future[Result],
+                                                log: Logger)(
+          implicit messageMarshaller: Unmarshaller[Array[Byte], Message],
+          mat: Materializer,
+          ex: ExecutionContext)
       extends PubsubSubscriber {
 
     private val subscriptionName = SubscriptionName.create(projectId, subscriptionId)
 
     private val messageReceiver = new MessageReceiver() {
       override def receiveMessage(message: PubsubMessage, consumer: AckReplyConsumer): Unit = {
-        val stringMessage = message.getData.toStringUtf8
-        log.info(s"Received a message ${message.getMessageId} for subscription $subscriptionId: $stringMessage")
-        receiver(stringMessage).transform(v => { consumer.ack(); v }, t => { consumer.nack(); t })
+        val messageBytes = message.getData.toByteArray
+        Unmarshal(messageBytes).to[Message].flatMap { messageBody =>
+          log.info(
+            s"Received a message ${message.getMessageId} for subscription $subscriptionId: ${new String(messageBytes)}")
+          receiver(messageBody).transform(v => { consumer.ack(); v }, t => { consumer.nack(); t })
+        }
       }
     }
 
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