Question

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

我的模拟器侦听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，主题就会被创建。但是如果我运行以下代码片段没有按预期工作，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);

在运行此模拟器时记录

[pubsub] Apr 27, 2017 1:10:47 PM io.gapi.emulators.grpc.GrpcServer$3 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$3 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$3 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.

我在ChannelProvider上遗漏了什么？或者我没有正确配置我的TopicAdminClient？自从我使用以来，我没有看到什么错误 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。以下内容应该有效：

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

这篇文章有点老了，希望这可以作为更新。

code snippet中的Testing apps locally with the emulator也可以使用。如果您点击链接页面上的“在GitHub上查看”链接，则完整的代码段位于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

2 个答案: