Accessing Google Cloud Pubsub over HTTP 2 using grpc and protobuf (generated client)

Question

I am attempting to use the google cloud pubsub service by using the service definitions at https://github.com/google/googleapis/blob/master/google/pubsub/v1/pubsub.proto

I am able to generate the client code and have the following code to get a topic:

        ManagedChannelImpl channelImpl = NettyChannelBuilder
                .forAddress("pubsub.googleapis.com", 443)
                .negotiationType(NegotiationType.TLS)
                .build();

        ClientAuthInterceptor interceptor = new ClientAuthInterceptor(
                GoogleCredentials.getApplicationDefault().createScoped(SCOPES),
                ForkJoinPool.commonPool());
        Channel channel = ClientInterceptors.intercept(channelImpl, interceptor);
        PublisherBlockingClient publisher = newBlockingStub(channel);
        Topic topicInstance;
        try {
            topicInstance = publisher.getTopic(GetTopicRequest.newBuilder().setTopic(topic).build());
            if (topicInstance != null) {
                logger.info("Found existing topic: {}", topicInstance.getName());
                return publisher;
            }
        } catch (Exception ex) {
            logger.info("Unable to find topic: {}", topic);
        }

This always fails with a 404. The network traffic (in DEBUG logging) seems to confirm that the client is hitting the wrong endpoint (for a publish message request):

DEBUG 2015-12-17 00:58:07,962 [grpc-default-worker-ELG-0] i.g.n.NettyClientTransport: 
----------------OUTBOUND--------------------
HEADERS: streamId=5, headers=DefaultHttp2Headers[:authority: pubsub.googleapis.com:443, :path: /google.pubsub.v1.Publisher/Publish, :method: POST, :scheme: https, authorization: Bearer ya29.TQIWiptEf4KsAKObPIaLaJRcq49SQ2vAutO4eIC-kgM4XwvX9p-9sFBR4eNfzE_yLiBs1A, content-type: application/grpc, te: trailers, user-agent: grpc-java-netty/0.9.0], streamDependency=0, weight=16, exclusive=false, padding=0, endStream=false
------------------------------------
DEBUG 2015-12-17 00:58:07,975 [grpc-default-worker-ELG-0] i.g.n.NettyClientTransport: 
----------------OUTBOUND--------------------
DATA: streamId=5, padding=0, endStream=true, length=725, bytes=00000002d00a136465765f616368617568616e2d6576656e747312b8050af9047b22486f7374223a226c6f63616c686f73743a3434303830222c22436f6e6e65...
------------------------------------
DEBUG 2015-12-17 00:58:11,492 [grpc-default-worker-ELG-0] i.g.n.NettyClientTransport: 
----------------INBOUND--------------------
HEADERS: streamId=5, headers=DefaultHttp2Headers[:status: 404, date: Thu, 17 Dec 2015 08:58:08 GMT, content-type: text/html; charset=UTF-8, server: ESF, content-length: 1595, x-xss-protection: 1; mode=block, x-frame-options: SAMEORIGIN, x-content-type-options: nosniff, alternate-protocol: 443:quic,p=1, alt-svc: quic=":443"; ma=604800; v="30,29,28,27,26,25"], padding=0, endStream=false
------------------------------------
DEBUG 2015-12-17 00:58:26,357 [grpc-default-worker-ELG-0] i.g.n.NettyClientTransport: 
----------------INBOUND--------------------
DATA: streamId=5, padding=0, endStream=true, length=1595, bytes=3c21444f43545950452068746d6c3e0a3c68746d6c206c616e673d656e3e0a20203c6d65746120636861727365743d7574662d383e0a20203c6d657461206e61...
------------------------------------
DEBUG 2015-12-17 00:58:26,357 [grpc-default-worker-ELG-0] i.g.n.NettyClientTransport: 
----------------INBOUND--------------------
PING: ack=false, length=8, bytes=0000000000000002
------------------------------------
DEBUG 2015-12-17 00:58:26,358 [grpc-default-worker-ELG-0] i.g.n.NettyClientTransport: 
----------------OUTBOUND--------------------
PING: ack=true, length=8, bytes=00000000000000

What am I doing wrong here? Is the pubsub over HTTP 2 (using the protobuf) supported?

score 2 · Accepted Answer · edited Feb 18 '16 at 13:49

2

As of Dec 17 2015, we have not enabled gRPC on the pubsub.googleapis.com endpoint. Now we're actively testing gRPC support and hopefully we can make it available in the near future.

edited Feb 18 '16 at 13:49

Erik Forsberg

4,819
3
27
31

answered Dec 17 '15 at 21:19

Takashi Matsuo

3,406
16
25

Is this still valid? I saw some grpc-samples at https://github.com/GoogleCloudPlatform/cloud-pubsub-samples-java/tree/master/grpc and was wondering if it is possible. – Ankur Chauhan Feb 11 '16 at 23:05

Accessing Google Cloud Pubsub over HTTP 2 using grpc and protobuf (generated client)

1 Answers1