Spring Boot cloud GCP cannot connect to local Google PubSub emulator

问题

Trying to connect to local Google PubSub emulator from Spring boot application for tests.

Using below config
spring.cloud.gcp.pubsub.emulator-host=localhost:8085

Started emulator in local successfully on 8085, Also have set PUBSUB_EMULATOR_HOST=localhost:8085

Note: While connecting to the actual Google PubSub topic everything just works fine.

回答1:

When using the Pub/Sub emulator, use the FixedTransportChannelProvider and NoCredentialsProvider to create a Publisher or Subscriber. This is demonstrated in UsePubSubEmulatorSnippet.java:

String hostport = System.getenv("PUBSUB_EMULATOR_HOST");
ManagedChannel channel = ManagedChannelBuilder.forTarget(hostport).usePlaintext(true).build();
TransportChannelProvider channelProvider = FixedTransportChannelProvider.create(GrpcTransportChannel.create(channel));

CredentialsProvider credentialsProvider = NoCredentialsProvider.create();

ProjectTopicName topicName = ...

// Use the channel and credentials provider when creating a Publisher or Subscriber.
Publisher publisher =
    Publisher.newBuilder(topicName)
        .setChannelProvider(channelProvider)
        .setCredentialsProvider(credentialsProvider)
        .build();

回答2:

Create a file under src/test/resources/application.properties
Set spring.cloud.gcp.pubsub.emulator-host=localhost:8085 inside the test application.properties.
Annotate your test class so that Spring picks up your test application.properties:

@RunWith(SpringRunner::class)
@SpringBootTest

EDIT: I created an example project that shows how to use Spring with PubSub emulator in a test (which also requires creating the topic and subscription): https://github.com/nhartner/pubsub-emulator-demo

来源：https://stackoverflow.com/questions/51290024/spring-boot-cloud-gcp-cannot-connect-to-local-google-pubsub-emulator

标签

spring-boot

google-cloud-pubsub