[CAMEL-10793] camel cloud: expose routes as a service

• Type: New Feature
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 2.22.0
• Component/s: camel-core
• Labels: cloud
• Estimated Complexity: Unknown
• Assignee: Luca Burgazzoli
• Reporter: Luca Burgazzoli
• Created: 06/Feb/17 16:18
• Updated: 30/May/18 12:27
• Resolved: 30/May/18 12:27

Description

As today we have a ServiceCall EIP that makes it easy to call external services in a cloud environment leveraging external service registry such as kubernetes, consul, etcd, spring-cloud & co so It could make sense to add a way for a route to register itself in such registries and be available as a service for other to consume.

Something like:

    // programmatic config
    from("jetty:http://0.0.0.0:8001/service1")
        .serviceRegistry()
            .name("service-1")
            .host("....")
            .port(8001)
            .meta("camel.protocol", "http")
            .meta("camel.component", "jetty")
            .meta("camel.context.path", "/service1")
            .end()
        .to("direct:service-1")

    // Inherit from a global config and eventually override it
    from("jetty:http://0.0.0.0:8002/service2")
      .serviceRegistry("service-2")
          .configRef("service-registry-conf")
          .port(8002)
      .to("direct:service-2")

    // Smart auto configuration
    //   i.e. if the endpoint implements DiscoverableService
    from("jetty:http://0.0.0.0:8003/service3")
      .serviceRegistry("service-3")
      .to("direct:service-3")

Beside making camel play better in cloud environment, you can use the service call to connect camel based micro services with minimal configuration as the registration may provide some additional meta data that the service call can use for auto-configuration (of course not all the registries can do it).

The future Health API/Service may then also be configured to remove or invalidate the service if the route is reported as not healthy.

Issue Links

• is related to: CAMEL-10026 HealthCheck API
• links to: GitHub Pull Request #2352
• links to: GitHub Pull Request #2353

Sub-Tasks

• camel cloud : create camel-service component: Resolved
• camel cloud : create a service registration route policy: Resolved
• camel cloud : leverage spring-cloud ServiceRegistry to register routes: Resolved
• camel cloud : create a spring cloud based camel-service example: Resolved