在 pubsub 模拟器上创建主题

Question

我开始使用 pubsub 模拟器来测试我的基本实现，并运行在尝试创建新主题时遇到问题。

我的模拟器监听 localhost:8085，如果我通过 api

创建主题

PUT http://localhost:8085/v1/projects/testproject/topics/test

一切正常，主题已创建。但是，如果我运行以下代码段没有任何效果，也没有创建任何主题：

    TopicName topicName = TopicName.create("testproject", "test");
    ChannelProvider channelProvider =
            TopicAdminSettings.defaultChannelProviderBuilder()
                .setEndpoint("localhost:8085")
                .setCredentialsProvider(
                        FixedCredentialsProvider.create(NoCredentials.getInstance()))
                .build();
    TopicAdminClient topicClient = TopicAdminClient.create(
            TopicAdminSettings.defaultBuilder().setChannelProvider(channelProvider).build());
        topicClient.createTopic(topicName);

而运行模拟器记录此

[pubsub] Apr 27, 2017 1:10:47 PM io.gapi.emulators.grpc.GrpcServer operationComplete
[pubsub] INFORMATION: Adding handler(s) to newly registered Channel.
[pubsub] Apr 27, 2017 1:10:47 PM io.gapi.emulators.netty.HttpVersionRoutingHandler channelRead
[pubsub] INFORMATION: Detected non-HTTP/2 connection.
[pubsub] Apr 27, 2017 1:10:47 PM io.gapi.emulators.netty.NotFoundHandler handleRequest
[pubsub] INFORMATION: Unknown request URI: /bad-request
[pubsub] Apr 27, 2017 1:10:47 PM io.gapi.emulators.grpc.GrpcServer operationComplete
[pubsub] INFORMATION: Adding handler(s) to newly registered Channel.
[pubsub] Apr 27, 2017 1:10:47 PM io.gapi.emulators.netty.HttpVersionRoutingHandler channelRead
[pubsub] INFORMATION: Detected non-HTTP/2 connection.
[pubsub] Apr 27, 2017 1:10:47 PM io.gapi.emulators.netty.NotFoundHandler handleRequest
[pubsub] INFORMATION: Unknown request URI: /bad-request

...    

[pubsub] Apr 27, 2017 1:10:49 PM io.gapi.emulators.grpc.GrpcServer operationComplete
[pubsub] INFORMATION: Adding handler(s) to newly registered Channel.
[pubsub] Apr 27, 2017 1:10:49 PM io.gapi.emulators.netty.HttpVersionRoutingHandler channelRead
[pubsub] INFORMATION: Detected non-HTTP/2 connection.

我是不是在 ChannelProvider 上遗漏了什么？还是我没有正确配置 TopicAdminClient？我看不出有什么问题，因为我用过 this as reference.

也许有人可以帮我解决这个问题。

Answer 1

用于与模拟器通信的通道需要将negotiationType 属性设置为NegotiationType.PLAINTEXT。这意味着您需要创建自定义 ChannelProvider。像下面这样的东西应该可以工作：

public class PlainTextChannelProvider implements ChannelProvider {
  @Override
  public boolean shouldAutoClose() {
    return false;
  }

  @Override
  public boolean needsExecutor() {
    return false;
  }

  @Override
  public ManagedChannel getChannel() throws IOException {
    return NettyChannelBuilder.forAddress("localhost", 8085)
      .negotiationType(NegotiationType.PLAINTEXT)
      .build();
  }

  @Override
  public ManagedChannel getChannel(Executor executor) throws IOException {
    return getChannel();
  }
}

Answer 2

这个post有点旧，希望能作为更新。

code snippet from Testing apps locally with the emulator 也有效。如果您在 linked 页面上关注 "View on GitHub" link，完整的代码片段在 GitHub 上。

String hostport = System.getenv("PUBSUB_EMULATOR_HOST");
ManagedChannel channel = ManagedChannelBuilder.forTarget(hostport).usePlaintext().build();
try {
  TransportChannelProvider channelProvider =
      FixedTransportChannelProvider.create(GrpcTransportChannel.create(channel));
  CredentialsProvider credentialsProvider = NoCredentialsProvider.create();

  TopicAdminClient topicClient =
      TopicAdminClient.create(
          TopicAdminSettings.newBuilder()
              .setTransportChannelProvider(channelProvider)
              .setCredentialsProvider(credentialsProvider)
              .build());
  try {
      response = topicClient.createTopic(topicName);
      System.out.printf("Topic %s created.\n", response);
  } catch (ApiException e) {
      System.out.println(e.getStatusCode().getCode());
      System.out.println(e.isRetryable());
      System.out.println("No topic was created.");
  }

} finally {
  channel.shutdown();
}

在 pubsub 模拟器上创建主题

Creating topic on pubsub emulator

java

google-cloud-platform

google-cloud-endpoints

google-cloud-pubsub