Migrate away from Akka to Apache Pekko (#26)

Author: miguelbranco80

build.sbt

@@ -29,8 +29,7 @@ lazy val compileSettings = Seq(
   // Ensure Java-based DAS SDK code is compiled first, so it is accessible from Scala.
   compileOrder := CompileOrder.JavaThenScala,
   // Ensure we fork new JVM for run, so we can set JVM flags.
-  Compile / run / fork := true
-)
+  Compile / run / fork := true)
 
 lazy val testSettings = Seq(
   // Ensure we fork new JVM for run, so we can set JVM flags.
@@ -74,11 +73,9 @@ lazy val root = (project in file("."))
       // Protocol DAS
       "com.raw-labs" %% "protocol-das" % "1.0.0",
       // Akka Streams
-      "com.typesafe.akka" %% "akka-actor-typed" % "2.8.8",
-      "com.typesafe.akka" %% "akka-actor" % "2.8.8",
-      "com.typesafe.akka" %% "akka-stream" % "2.8.8",
-      "com.typesafe.akka" %% "akka-actor-testkit-typed" % "2.8.8",
-      "com.typesafe.akka" %% "akka-testkit" % "2.8.8",
+      "org.apache.pekko" %% "pekko-actor-typed" % "1.1.3",
+      "org.apache.pekko" %% "pekko-stream" % "1.1.3",
+      "org.apache.pekko" %% "pekko-http" % "1.1.0",
       // Jackson databind
       "com.fasterxml.jackson.core" % "jackson-databind" % "2.18.2" % Test,
       // gRPC Testing

src/main/resources/reference.conf

@@ -1,5 +1,3 @@
-akka.license-key=${?AKKA_LICENSE_KEY}
-
 das {
     server {
         port = 50051 # the port the server listens on

src/main/scala/com/rawlabs/das/server/DASServer.scala

@@ -15,6 +15,10 @@ package com.rawlabs.das.server
 import scala.concurrent.ExecutionContext
 import scala.jdk.DurationConverters.JavaDurationOps
 
+import org.apache.pekko.actor.typed.scaladsl.Behaviors
+import org.apache.pekko.actor.typed.{ActorSystem, Scheduler}
+import org.apache.pekko.stream.Materializer
+
 import com.rawlabs.das.sdk.DASSettings
 import com.rawlabs.das.server.cache.QueryResultCache
 import com.rawlabs.das.server.grpc.{
@@ -27,9 +31,6 @@ import com.rawlabs.das.server.manager.DASSdkManager
 import com.rawlabs.das.server.webui.{DASWebUIServer, DebugAppService}
 import com.rawlabs.protocol.das.v1.services.{HealthCheckServiceGrpc, RegistrationServiceGrpc, TablesServiceGrpc}
 
-import akka.actor.typed.scaladsl.Behaviors
-import akka.actor.typed.{ActorSystem, Scheduler}
-import akka.stream.Materializer
 import io.grpc.{Server, ServerBuilder}
 
 class DASServer(resultCache: QueryResultCache)(

src/main/scala/com/rawlabs/das/server/grpc/TableServiceGrpcImpl.scala

@@ -18,6 +18,10 @@ import scala.jdk.CollectionConverters._
 import scala.jdk.OptionConverters._
 import scala.util.{Failure, Success}
 
+import org.apache.pekko.NotUsed
+import org.apache.pekko.stream.scaladsl.{Keep, Sink, Source}
+import org.apache.pekko.stream.{KillSwitches, Materializer, UniqueKillSwitch}
+
 import com.rawlabs.das.sdk.{DASExecuteResult, DASSdk, DASSdkUnsupportedException, DASTable}
 import com.rawlabs.das.server.cache.{QueryCacheKey, QueryResultCache}
 import com.rawlabs.das.server.manager.DASSdkManager
@@ -26,9 +30,6 @@ import com.rawlabs.protocol.das.v1.services._
 import com.rawlabs.protocol.das.v1.tables._
 import com.typesafe.scalalogging.StrictLogging
 
-import akka.NotUsed
-import akka.stream.scaladsl.{Keep, Sink, Source}
-import akka.stream.{KillSwitches, Materializer, UniqueKillSwitch}
 import io.grpc.stub.{ServerCallStreamObserver, StreamObserver}
 import io.grpc.{Status, StatusRuntimeException}
 

src/main/scala/com/rawlabs/das/server/webui/DASWebUIServer.scala

@@ -15,10 +15,10 @@ package com.rawlabs.das.server.webui
 import scala.concurrent.ExecutionContext
 import scala.util.{Failure, Success}
 
-import akka.actor.typed.ActorSystem
-import akka.http.scaladsl.Http
-import akka.http.scaladsl.server.Directives._
-import akka.stream.Materializer
+import org.apache.pekko.actor.typed.ActorSystem
+import org.apache.pekko.http.scaladsl.Http
+import org.apache.pekko.http.scaladsl.server.Directives._
+import org.apache.pekko.stream.Materializer
 
 object DASWebUIServer {
 

src/main/scala/com/rawlabs/das/server/webui/DebugAppService.scala

@@ -12,9 +12,10 @@
 
 package com.rawlabs.das.server.webui
 
+import org.apache.pekko.http.scaladsl.model._
+
 import com.rawlabs.das.server.cache.QueryResultCache
 
-import akka.http.scaladsl.model._
 import scalatags.Text.all._
 import scalatags.Text.tags2.title
 

src/test/scala/com/rawlabs/das/server/grpc/TablesServiceDASMockTestSpec.scala

@@ -20,6 +20,10 @@ import scala.concurrent.duration._
 import scala.jdk.CollectionConverters._
 import scala.util.Try
 
+import org.apache.pekko.actor.typed.scaladsl.Behaviors
+import org.apache.pekko.actor.typed.{ActorSystem, Scheduler}
+import org.apache.pekko.stream.Materializer
+import org.apache.pekko.util.Timeout
 import org.scalatest.BeforeAndAfterAll
 import org.scalatest.concurrent.ScalaFutures
 import org.scalatest.matchers.should.Matchers
@@ -34,10 +38,6 @@ import com.rawlabs.protocol.das.v1.services._
 import com.rawlabs.protocol.das.v1.tables._
 import com.rawlabs.protocol.das.v1.types.{Value, ValueInt, ValueString}
 
-import akka.actor.typed.scaladsl.Behaviors
-import akka.actor.typed.{ActorSystem, Scheduler}
-import akka.stream.Materializer
-import akka.util.Timeout
 import io.grpc.inprocess.{InProcessChannelBuilder, InProcessServerBuilder}
 import io.grpc.{ManagedChannel, Server, StatusRuntimeException}
 

src/test/scala/com/rawlabs/das/server/grpc/TablesServiceHighConcurrencySpec.scala

@@ -20,6 +20,10 @@ import scala.concurrent.duration._
 import scala.concurrent.{Await, ExecutionContext, Future, Promise}
 import scala.util.{Random, Try}
 
+import org.apache.pekko.actor.typed.scaladsl.Behaviors
+import org.apache.pekko.actor.typed.{ActorRef, ActorSystem, Scheduler}
+import org.apache.pekko.stream.{Materializer, SystemMaterializer}
+import org.apache.pekko.util.Timeout
 import org.scalatest.BeforeAndAfterAll
 import org.scalatest.concurrent.{Futures, ScalaFutures}
 import org.scalatest.matchers.should.Matchers
@@ -35,10 +39,6 @@ import com.rawlabs.protocol.das.v1.services._
 import com.rawlabs.protocol.das.v1.tables._
 import com.rawlabs.protocol.das.v1.types.{Value, ValueInt}
 
-import akka.actor.typed.scaladsl.Behaviors
-import akka.actor.typed.{ActorRef, ActorSystem, Scheduler}
-import akka.stream.{Materializer, SystemMaterializer}
-import akka.util.Timeout
 import io.grpc.inprocess.{InProcessChannelBuilder, InProcessServerBuilder}
 import io.grpc.stub.{ClientCallStreamObserver, ClientResponseObserver}
 import io.grpc.{ManagedChannel, Server}

src/test/scala/com/rawlabs/das/server/grpc/TablesServiceIntegrationSpec.scala

@@ -18,6 +18,11 @@ import java.nio.file.Files
 import scala.concurrent.ExecutionContext
 import scala.util.Try
 
+import org.apache.pekko.actor.typed.scaladsl.Behaviors
+// gRPC stubs
+import org.apache.pekko.actor.typed.{ActorSystem, Scheduler}
+import org.apache.pekko.stream.Materializer
+import org.apache.pekko.util.Timeout
 import org.scalatest.BeforeAndAfterAll
 import org.scalatest.concurrent.ScalaFutures
 import org.scalatest.matchers.should.Matchers
@@ -31,11 +36,6 @@ import com.rawlabs.protocol.das.v1.query.Query
 import com.rawlabs.protocol.das.v1.services._
 import com.rawlabs.protocol.das.v1.tables._
 
-import akka.actor.typed.scaladsl.Behaviors
-// gRPC stubs
-import akka.actor.typed.{ActorSystem, Scheduler}
-import akka.stream.Materializer
-import akka.util.Timeout
 import io.grpc.inprocess.{InProcessChannelBuilder, InProcessServerBuilder}
 import io.grpc.{ManagedChannel, Server, StatusRuntimeException}