Checking Status

This page describes how to use Service Infrastructure for checking status on managed services, service producers, service consumers, and API keys.

When a service producer offers a service to its service consumers, it needs to ensure that various preconditions are met, such as whether:

• A service consumer has been deleted.
• The service consumer has enabled the service.
• An API key is valid.

The Service Control API provides a simple services.check method to check such preconditions. A managed service should call this method on a regular basis to ensure the preconditions are met. The activity between the service producer and the service consumer is represented by an Operation. The services.check method performs the following checks on the operation:

• The service producer project is live and in a healthy state.
• The service consumer project is live and in a healthy state.
• The managed service is enabled on the service consumer project.
• The API key is valid.
• The use of the API key satisfies restrictions associated with the API key, such as IP or HTTP referrer restrictions.

The services.check method is typically called from the servers that actually implement the service. For security and privacy purposes, the Service Control API uses Identity and Access Management to verify the caller has the proper permission to call the method. For details, see Service Control API Access Control.

Checking status

After you roll out a managed service, you can call the services.check method on the service without additional configuration. See the services.check reference for details.

To quickly experiment with the method, you can use the gcurl command to call the services.check method. See Getting Started with the Service Control API for the initial setup steps.

gcurl -d '{
  "operation": {
    "operationId": "123e4567-e89b-12d3-a456-426655440000",
    "consumerId": "project:endpointsapis-consumer",
    "startTime":"2016-07-31T05:20:00Z",
    "operationName":"google.example.hello.v1.HelloService.GetHello"
  }
}' https://servicecontrol.googleapis.com/v1/services/endpointsapis.appspot.com:check
{
  "operationId": "123e4567-e89b-12d3-a456-426655440000"
}

The response from the check method indicates whether all checks succeeded or some checks failed. Success is indicated by the absence of checkErrors field. Otherwise, the checkErrors field lists the failed checks.