From b98ef922c02aa10a8514f2a827e17b56e7a2d74a Mon Sep 17 00:00:00 2001
From: Zach Smith <zach@driver.xyz>
Date: Thu, 31 Aug 2017 16:24:44 -0700
Subject: Autocreate pubsub topics on publisher creation

---
 src/main/scala/xyz/driver/core/pubsub.scala | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

(limited to 'src/main/scala')

diff --git a/src/main/scala/xyz/driver/core/pubsub.scala b/src/main/scala/xyz/driver/core/pubsub.scala
index e7e5d4a..d8e64e7 100644
--- a/src/main/scala/xyz/driver/core/pubsub.scala
+++ b/src/main/scala/xyz/driver/core/pubsub.scala
@@ -4,7 +4,7 @@ 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.cloud.pubsub.spi.v1._
 import com.google.protobuf.ByteString
 import com.google.pubsub.v1.{PubsubMessage, SubscriptionName, TopicName}
 import com.typesafe.scalalogging.Logger
@@ -21,14 +21,25 @@ object pubsub {
     def publish(message: Message): Future[Result]
   }
 
-  class GooglePubsubPublisher[Message](projectId: String, topicName: String, log: Logger)(
+  class GooglePubsubPublisher[Message](projectId: String, topic: String, log: Logger, autoCreate: Boolean = true)(
           implicit messageMarshaller: Marshaller[Message, String],
           ex: ExecutionContext
   ) extends PubsubPublisher[Message] {
 
     type Result = Id[PubsubMessage]
 
-    private val publisher = Publisher.defaultBuilder(TopicName.create(projectId, topicName)).build()
+    private val topicName = TopicName.create(projectId, topic)
+
+    private val publisher = {
+      if (autoCreate) {
+        val adminClient = TopicAdminClient.create()
+        val topicExists = Try(adminClient.getTopic(topicName)).isSuccess
+        if (!topicExists) {
+          adminClient.createTopic(topicName)
+        }
+      }
+      Publisher.defaultBuilder(topicName).build()
+    }
 
     override def publish(message: Message): Future[Id[PubsubMessage]] = {
 
@@ -44,12 +55,12 @@ object pubsub {
           messageIdFuture,
           new ApiFutureCallback[String]() {
             override def onSuccess(messageId: String): Unit = {
-              log.info(s"Published a message with topic $topicName, message id $messageId: $messageString")
+              log.info(s"Published a message with topic $topic, message id $messageId: $messageString")
               promise.complete(Try(Id[PubsubMessage](messageId)))
             }
 
             override def onFailure(t: Throwable): Unit = {
-              log.warn(s"Failed to publish a message with topic $topicName: $message", t)
+              log.warn(s"Failed to publish a message with topic $topic: $message", t)
               promise.complete(Failure(t))
             }
           }
-- 
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