Блог

Я часами безуспешно пытался получить Camel-маршруты моего приложения Spring Boot для загрузки (через компонент Camel camel-google-pubsub для подключения к локальному экземпляру эмулятора Google Pubsub.

• Мой эмулятор запущен :

 ❯ gcloud beta emulators pubsub start --host-port=localhost:8085 --project=local
Executing: /usr/lib/google-cloud-sdk/platform/pubsub-emulator/bin/cloud-pubsub-emulator --host=localhost --port=8085
[pubsub] This is the Google Pub/Sub fake.
[pubsub] Implementation may be incomplete or differ from the real system.
[pubsub] déc. 01, 2020 6:14:32 PM com.google.cloud.pubsub.testing.v1.Main main
[pubsub] INFO: IAM integration is disabled. IAM policy methods and ACL checks are not supported
[pubsub] déc. 01, 2020 6:14:33 PM com.google.cloud.pubsub.testing.v1.Main main
[pubsub] INFO: Server started, listening on 8085
 

• Мой env var в порядке: PUBSUB_EMULATOR_HOST=localhost:8085 и я отключил GOOGLE_APPLICATION_CREDENTIALS , чтобы избежать подключения к реальному экземпляру PubSub
• Мой маршрут Camel :

 @Component
public class MapperInRoute extends ESBRouteBuilder {

    private final String dlFuncTopic;
    private final String subscription;
    private final String routeName;
    private final String getLinksTopic;

    public MapperInRoute(
        final MapperInRouteConfiguration config,
        @Value("${routes.get-links-topic}") final String getLinksTopic
    ) {
        this.dlFuncTopic = config.getDlFuncTopic();
        this.subscription = config.getSubscription();
        this.routeName = config.getName();
        this.getLinksTopic = getLinksTopic;
    }

    @Override
    public void configure() {
        from(format("google-pubsub:{{gcp.pubsub.project-id}}:%s", subscription))
            .routeId(routeName)
            // my route code
            .to(format("google-pubsub:{{gcp.pubsub.project-id}}:%s", getLinksTopic))
        ;
    }
}
 

• Мой application-dev.yml :

 gcp.pubsub.project-id: local

spring.cloud.gcp.pubsub:
    emulator-host: localhost:8085
    project-id: local

camel.component.google-pubsub.connection-factory.serviceURL: localhost:8085
 

И, наконец, когда я пытаюсь запустить свое приложение локально, мой вывод на консоль выглядит так :

 2020-12-03 12:17:58 INFO   | Starting Application using Java 11.0.2 on lasouche-vm with PID 78394 (/home/mathieu/git/rocher/omnichannel/esb/poc-omega/target/classes started by mathieu in /home/mathieu/git/rocher/omnichannel/esb/poc-omega)
2020-12-03 12:17:58 INFO   | The following profiles are active: dev
2020-12-03 12:17:59 INFO   | Type converters loaded (core: 195, classpath: 10)
2020-12-03 12:17:59 WARN   | UT026010: Buffer pool was not set on WebSocketDeploymentInfo, the default pool will be used
2020-12-03 12:17:59 INFO   | Initializing Spring embedded WebApplicationContext
2020-12-03 12:17:59 INFO   | Root WebApplicationContext: initialization completed in 1696 ms
2020-12-03 12:18:00 INFO   | Registered '/actuator/jolokia' to jolokia-actuator-endpoint
2020-12-03 12:18:00 INFO   | Initialising hawtio services
2020-12-03 12:18:00 INFO   | Configuration will be discovered via system properties
2020-12-03 12:18:00 INFO   | Welcome to Hawtio 2.10.0
2020-12-03 12:18:00 INFO   | Initializing ExecutorService 'applicationTaskExecutor'
2020-12-03 12:18:00 INFO   | Adding welcome page: class path resource [static/index.html]
2020-12-03 12:18:00 INFO   | The default project ID is omega-lab-e5727d
2020-12-03 12:18:00 INFO   | Failed to detect whether we are running on Google Compute Engine.
2020-12-03 12:18:00 WARN   | No core credentials are set. Service-specific credentials (e.g., spring.cloud.gcp.pubsub.credentials.*) should be used if your app uses services that require credentials.
java.io.IOException: The Application Default Credentials are not available. They are available if running in Google Compute Engine. Otherwise, the environment variable GOOGLE_APPLICATION_CREDENTIALS must be defined pointing to a file defining the credentials. See https://developers.google.com/accounts/docs/application-default-credentials for more information.
    at com.google.auth.oauth2.DefaultCredentialsProvider.getDefaultCredentials(DefaultCredentialsProvider.java:134)
    at com.google.auth.oauth2.GoogleCredentials.getApplicationDefault(GoogleCredentials.java:119)
    at com.google.auth.oauth2.GoogleCredentials.getApplicationDefault(GoogleCredentials.java:91)
    at com.google.api.gax.core.GoogleCredentialsProvider.getCredentials(GoogleCredentialsProvider.java:67)
    at org.springframework.cloud.gcp.core.DefaultCredentialsProvider.<init>(DefaultCredentialsProvider.java:110)
    at org.springframework.cloud.gcp.autoconfigure.core.GcpContextAutoConfiguration.googleCredentials(GcpContextAutoConfiguration.java:61)
    [...]
2020-12-03 12:18:04 INFO   | Initializing ExecutorService 'pubsubPublisherThreadPool'
2020-12-03 12:18:05 INFO   | Initializing ExecutorService 'pubsubSubscriberThreadPool'
2020-12-03 12:18:05 INFO   | Initializing ExecutorService 'pubSubAcknowledgementExecutor'
2020-12-03 12:18:05 INFO   | Exposing 7 endpoint(s) beneath base path '/actuator'
2020-12-03 12:18:06 INFO   | Initialized CamelHttpTransportServlet[name=CamelServlet, contextPath=]
2020-12-03 12:18:06 INFO   | Starting hawtio authentication filter, JAAS authentication disabled
2020-12-03 12:18:06 INFO   | starting server: Undertow - 2.2.2.Final
2020-12-03 12:18:06 INFO   | XNIO version 3.8.0.Final
2020-12-03 12:18:06 INFO   | XNIO NIO Implementation Version 3.8.0.Final
2020-12-03 12:18:06 INFO   | JBoss Threads version 3.1.0.Final
2020-12-03 12:18:06 INFO   | Undertow started on port(s) 8080 (http)
2020-12-03 12:18:06 INFO   | Loading additional Camel XML routes from: classpath:camel/*.xml
2020-12-03 12:18:06 INFO   | Loading additional Camel XML rests from: classpath:camel-rest/*.xml
2020-12-03 12:18:06 INFO   | Apache Camel 2.25.2 (CamelContext: camel-1) is starting
2020-12-03 12:18:06 INFO   | JMX is enabled
2020-12-03 12:18:06 INFO   | StreamCaching is not in use. If using streams then its recommended to enable stream caching. See more details at http://camel.apache.org/stream-caching.html
2020-12-03 12:18:13 INFO   | Apache Camel 2.25.2 (CamelContext: camel-1) is shutting down
2020-12-03 12:18:13 INFO   | Apache Camel 2.25.2 (CamelContext: camel-1) uptime 7.045 seconds
2020-12-03 12:18:13 INFO   | Apache Camel 2.25.2 (CamelContext: camel-1) is shutdown in 0.080 seconds
2020-12-03 12:18:13 INFO   | stopping server: Undertow - 2.2.2.Final
2020-12-03 12:18:13 INFO   | Destroying hawtio authentication filter
2020-12-03 12:18:13 INFO   | Destroyed CamelHttpTransportServlet[CamelServlet]
2020-12-03 12:18:13 INFO   | Destroying hawtio services
2020-12-03 12:18:13 INFO   | 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-12-03 12:18:13 ERROR  | Application run failed
org.apache.camel.RuntimeCamelException: org.apache.camel.FailedToCreateRouteException: Failed to create route esb-poc-omega-consumer: Route(esb-poc-omega-consumer)[[From[file:/data/loyalty/from/... because of Failed to create Producer for endpoint: google-pubsub://local:POC.OMEGA.CONSUMER.OUT. Reason: java.io.IOException: The Application Default Credentials are not available. They are available if running on Google App Engine, Google Compute Engine, or Google Cloud Shell. Otherwise, the environment variable GOOGLE_APPLICATION_CREDENTIALS must be defined pointing to a file defining the credentials. See https://developers.google.com/accounts/docs/application-default-credentials for more information.
    at org.apache.camel.util.ObjectHelper.wrapRuntimeCamelException(ObjectHelper.java:1826)
    at org.apache.camel.spring.SpringCamelContext.start(SpringCamelContext.java:136)
    at org.apache.camel.spring.SpringCamelContext.onApplicationEvent(SpringCamelContext.java:174)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:203)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:196)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:161)
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:426)
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:383)
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:945)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:591)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:767)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:326)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1309)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1298)
    at com.grouperocher.esb.pocfuse7.Application.main(Application.java:13)
Caused by: org.apache.camel.FailedToCreateRouteException: Failed to create route esb-poc-omega-consumer: Route(esb-poc-omega-consumer)[[From[file:/data/loyalty/from/... because of Failed to create Producer for endpoint: google-pubsub://local:POC.OMEGA.CONSUMER.OUT. Reason: java.io.IOException: The Application Default Credentials are not available. They are available if running on Google App Engine, Google Compute Engine, or Google Cloud Shell. Otherwise, the environment variable GOOGLE_APPLICATION_CREDENTIALS must be defined pointing to a file defining the credentials. See https://developers.google.com/accounts/docs/application-default-credentials for more information.
    at org.apache.camel.impl.RouteService.warmUp(RouteService.java:147)
    at org.apache.camel.impl.DefaultCamelContext.doWarmUpRoutes(DefaultCamelContext.java:3954)
    at org.apache.camel.impl.DefaultCamelContext.safelyStartRouteServices(DefaultCamelContext.java:3861)
    at org.apache.camel.impl.DefaultCamelContext.doStartOrResumeRoutes(DefaultCamelContext.java:3647)
    at org.apache.camel.impl.DefaultCamelContext.doStartCamel(DefaultCamelContext.java:3488)
    at org.apache.camel.impl.DefaultCamelContext$4.call(DefaultCamelContext.java:3247)
    at org.apache.camel.impl.DefaultCamelContext$4.call(DefaultCamelContext.java:3243)
    at org.apache.camel.impl.DefaultCamelContext.doWithDefinedClassLoader(DefaultCamelContext.java:3266)
    at org.apache.camel.impl.DefaultCamelContext.doStart(DefaultCamelContext.java:3243)
    at org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:72)
    at org.apache.camel.impl.DefaultCamelContext.start(DefaultCamelContext.java:3159)
    at org.apache.camel.spring.SpringCamelContext.start(SpringCamelContext.java:133)
    ... 16 common frames omitted
Caused by: org.apache.camel.FailedToCreateProducerException: Failed to create Producer for endpoint: google-pubsub://local:POC.OMEGA.CONSUMER.OUT. Reason: java.io.IOException: The Application Default Credentials are not available. They are available if running on Google App Engine, Google Compute Engine, or Google Cloud Shell. Otherwise, the environment variable GOOGLE_APPLICATION_CREDENTIALS must be defined pointing to a file defining the credentials. See https://developers.google.com/accounts/docs/application-default-credentials for more information.
    at org.apache.camel.impl.ProducerCache.doGetProducer(ProducerCache.java:572)
    [...]
Caused by: java.io.IOException: The Application Default Credentials are not available. They are available if running on Google App Engine, Google Compute Engine, or Google Cloud Shell. Otherwise, the environment variable GOOGLE_APPLICATION_CREDENTIALS must be defined pointing to a file defining the credentials. See https://developers.google.com/accounts/docs/application-default-credentials for more information.
    at com.google.api.client.googleapis.auth.oauth2.DefaultCredentialProvider.getDefaultCredential(DefaultCredentialProvider.java:98)
    at com.google.api.client.googleapis.auth.oauth2.GoogleCredential.getApplicationDefault(GoogleCredential.java:217)
    at com.google.api.client.googleapis.auth.oauth2.GoogleCredential.getApplicationDefault(GoogleCredential.java:195)
    at org.apache.camel.component.google.pubsub.GooglePubsubConnectionFactory.createDefault(GooglePubsubConnectionFactory.java:127)
    at org.apache.camel.component.google.pubsub.GooglePubsubConnectionFactory.buildClient(GooglePubsubConnectionFactory.java:101)
    at org.apache.camel.component.google.pubsub.GooglePubsubConnectionFactory.buildClient(GooglePubsubConnectionFactory.java:76)
    at org.apache.camel.component.google.pubsub.GooglePubsubConnectionFactory.getDefaultClient(GooglePubsubConnectionFactory.java:60)
    at org.apache.camel.component.google.pubsub.GooglePubsubEndpoint.afterPropertiesSet(GooglePubsubEndpoint.java:96)
    at org.apache.camel.component.google.pubsub.GooglePubsubEndpoint.createProducer(GooglePubsubEndpoint.java:104)
    at org.apache.camel.impl.ProducerCache.doGetProducer(ProducerCache.java:561)
    ... 118 common frames omitted
2020-12-03 12:18:13 INFO   | Shutting down ExecutorService 'pubSubAcknowledgementExecutor'
2020-12-03 12:18:13 INFO   | Shutting down ExecutorService 'pubsubSubscriberThreadPool'
2020-12-03 12:18:13 INFO   | Shutting down ExecutorService 'pubsubPublisherThreadPool'
2020-12-03 12:18:13 INFO   | Shutting down ExecutorService 'applicationTaskExecutor'
Disconnected from the target VM, address: '127.0.0.1:42485', transport: 'socket'

Process finished with exit code 1
 

Если кому-то уже удалось использовать эмулятор pubsub со своими маршрутами Camel, меня интересует ваше решение.

Мне наконец удалось подключить и использовать эмулятор локально.

Первым шагом было добавить GOOGLE_APPLICATION_CREDENTIALS env var в мою конфигурацию запуска (это не очень хорошо, потому что мы должны получить действительные учетные данные локально, чтобы подключиться к Google Pubsub, даже если мы не используем настоящий Pubsub).

Затем в application-dev.yml :

• Я удалил spring.cloud.gcp.pubsub и camel.component.google-pubsub.connection-factory.serviceURL свойства
• Я добавил следующее свойство: camel.component.google-pubsub.endpoint: localhost:8085 (вы были правы @burki спасибо!)

Наконец (и не в последнюю очередь), я обновил Camel (с 2.23.2 до 3.6.0), я не смог заставить мое приложение Camel работать с локальным эмулятором

PS: Не забудьте создать необходимые разделы / подписки локально, прежде чем запускать приложение :

 curl -s -X PUT http://localhost:8085/v1/projects/local/topics/my-topic
curl -s -X PUT http://localhost:8085/v1/projects/local/subscriptions/my-subscription -H 'content-type: application/json' -d '{"topic":"projects/local/topics/my-topic"}'
{...}
 

Я понятия не имею о Google pub / sub, но в сообщении об ошибке говорится

Учетные данные приложения по умолчанию недоступны. Они доступны, если работают на Google App Engine, Google Compute Engine или Google Cloud Shell. В противном случае должна быть определена переменная среды GOOGLE_APPLICATION_CREDENTIALS, указывающая на файл, определяющий учетные данные.

Я думаю, для симулятора вам нужно определить переменную среды GOOGLE_APPLICATION_CREDENTIALS , как следует из сообщения об ошибке.

Существует также страница разработчика Google с более подробной информацией, упомянутой в сообщении об ошибке.

Редактировать

Просматривая документы Camel-Google-PubSub, есть вызываемая опция конечной endpoint точки . И это описывается как

Конечная точка для использования с локальным эмулятором Pub / Sub.

Вы пытались установить конечную точку вашего локального эмулятора как

 google-pubsub://project-id:destinationName?endpoint=localhost:8085