How gRPC should be configured to be used with GAE Standard Java 8?

[dmitry....@teamdev.com]

I am configuring gRPC according to the answer, which says: "Using gRPC with GAE Java 8 doesn't need anything special.".

A gRPC server is started and deployed on a GAE Standard environment for Java 8:

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MyGrpcService service = ...

NettyServerBuilder.forPort(50051).addService(service).build();

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A client uses a service with the ManagedChannel:

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ManagedChannel channel = NettyChannelBuilder.forAddress("my-project.appspot.com", 50051)

                                                                               .usePlaintext(true)

                                                                               .build();

MyGrpcService.newBlockingStub(channel);

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What am I doing wrong? The call to the service has the following result:

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Exception in thread "main" io.grpc.StatusRuntimeException: UNAVAILABLE

at io.grpc.stub.ClientCalls.toStatusRuntimeException(ClientCalls.java:210)

at io.grpc.stub.ClientCalls.getUnchecked(ClientCalls.java:191)

at io.grpc.stub.ClientCalls.blockingUnaryCall(ClientCalls.java:124)

at io.spine.client.grpc.QueryServiceGrpc$QueryServiceBlockingStub.read(QueryServiceGrpc.java:159)

at io.spine.examples.todolist.client.CommandLineTodoClient.getMyListView(CommandLineTodoClient.java:189)

at io.spine.examples.todolist.view.MyTasksListView.render(MyTasksListView.java:68)

at io.spine.cli.AbstractScreen.renderView(AbstractScreen.java:63)

at io.spine.cli.action.TransitionAction.execute(TransitionAction.java:51)

at io.spine.cli.view.AbstractView.executeAction(AbstractView.java:108)

at io.spine.cli.view.AbstractView.render(AbstractView.java:92)

at io.spine.cli.AbstractScreen.renderView(AbstractScreen.java:63)

at io.spine.cli.action.TransitionAction.execute(TransitionAction.java:51)

at io.spine.cli.view.AbstractView.executeAction(AbstractView.java:108)

at io.spine.cli.view.AbstractView.render(AbstractView.java:92)

at io.spine.cli.AbstractScreen.renderView(AbstractScreen.java:63)

at io.spine.examples.todolist.ClientApplication.run(ClientApplication.java:52)

at io.spine.examples.todolist.GaeClient.main(GaeClient.java:39)

Caused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection timed out: no further information: spine-dev.appspot.com/216.58.209.84:50051

at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)

at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)

at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:352)

at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:340)

at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:633)

at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580)

at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:497)

at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459)

at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)

at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138)

at java.lang.Thread.run(Thread.java:745)

Caused by: java.net.ConnectException: Connection timed out: no further information

... 11 more

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[Kun Zhang]

Have you confirmed that this address is indeed connectable, e.g., allowed by firewall?

[dmitry....@teamdev.com]

I can successfully access servlets using this address, firewall rules - allow full range of IPs.

Should i configure a host name in `NettyServerBuilder` explicitly?

[Spencer Fang]

GAE apps that expose a gRPC service is not supported at this time, but they can be clients that talk to gRPC services. I think there may have been some miscommunication in the original thread. I found some information about hosting gRPC services in Google Compute Engine, which may be a possible alternative for you:

https://cloud.google.com/endpoints/docs/grpc/get-started-grpc-compute-engine-docker

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Spencer Fang