Switch to Play 3 and Pekko

[mkurz]

The funny thing is

• fix: mTLS server and client setup and docs akka/akka-grpc#1781

is not ported to Pekko gRPC yet 🤣 so we end up with the IllegalArgumentException: "ALPN must be enabled and list HTTP/2 as a supported protocol" here as well.

For this PR good news is that if we would comment out

• play-grpc/play-specs2/src/test/scala/play/grpc/specs2/PlaySpecs2Spec.scala

  Lines 67 to 72 in deeea2e

  	"work with a gRPC client" >> { implicit rs: RunningServer =>
  	withGrpcClient[GreeterServiceClient] { client: GreeterServiceClient =>
  	val reply = await(client.sayHello(HelloRequest("Alice")))
  	reply.message must ===("Hello, Alice!")
  	}
  	}

• play-grpc/play-scalatest/src/test/scala/play/grpc/scalatest/PlayScalaTestSpec.scala

  Lines 65 to 68 in deeea2e

  	"work with a gRPC client" in withGrpcClient[GreeterServiceClient] { client: GreeterServiceClient =>
  	val reply = client.sayHello(HelloRequest("Alice")).futureValue
  	reply.message must be("Hello, Alice!")
  	}

• play-grpc/play-scalatest/src/test/scala/play/grpc/scalatest/PlayActionsScalaTestSpec.scala

  Lines 67 to 70 in deeea2e

  	"work with a gRPC client" in withGrpcClient[GreeterServiceClient] { client: GreeterServiceClient =>
  	val reply = client.sayHello(HelloRequest("Alice")).futureValue
  	reply.message must be("Hello, Alice!")
  	}

• play-grpc/play-testkit/src/test/java/play/grpc/testkit/PlayJavaFunctionalTest.java

  Lines 84 to 101 in deeea2e

  	@Test
  	public void worksWithAGrpcClient() throws Exception {
  	final HelloRequest req = HelloRequest.newBuilder().setName("Alice").build();
  	final GrpcClientSettings grpcClientSettings =
  	JavaAkkaGrpcClientHelpers.grpcClientSettings(runningServer)
  	.withOverrideAuthority("localhost");
  	final GreeterServiceClient greeterServiceClient =
  	GreeterServiceClient.create(grpcClientSettings, app.asScala().actorSystem());
  	try {
  	final HelloReply helloReply = greeterServiceClient.sayHello(req).toCompletableFuture().get();
  	assertEquals("Hello, Alice!", helloReply.getMessage());
  	} finally {
  	greeterServiceClient.close().toCompletableFuture().get(30, TimeUnit.SECONDS);
  	}
  	}

it should become green.

This PR also switched groupId to org.playframework.

TODO:

• Everything inside the docs/ folder

[mkurz]

@ihostage What do you think about the ALPN thing? Funny or not?

[mkurz]

See https://github.com/playframework/play-grpc/actions/runs/7289299369/job/19863703713?pr=490#step:10:467

[ihostage]

is not ported to Pekko gRPC yet 🤣

It was a predictable 😂

[mkurz]

@ihostage You want to open an issue?

[mkurz]

Pushed a commit to see if CI turns green ignoring the ALPN problem.

[ihostage]

@ihostage You want to open an issue?

I want an open PR, because It will be more quickly win strategy for us 😄

[sentenza]

@mkurz @ihostage Thank you so much for jumping onto this Play3 PR so quickly!

@mkurz perhaps commenting out those 4 tests while waiting for the next Pekko gRPC version is not the end of the world. Probably it would be worth to add a specific note in the README with a related TODO list.

[mkurz]

Let's merge this so we can continue, we can enable the tests in another PR.