[Bug]: There seems to be no way to set the success code for gRPC services

[proof-nicholas]

Description:

I have a backend gRPC service that I'm attempting to set the health check success code with an http configuration as follows:

    http:
      version: grpc
      path: /
      healthcheck:
        path: "/grpc.health.v1.Health/Check"
        success_codes: "0"

I get the following error:

- Updating the infrastructure for ...                   [update rollback complete]  [10.5s]
  The following resource(s) failed to update: [TargetGroup].
  - A target group to connect the load balancer to your service on port 8080         [update complete]           [0.0s]
    Resource handler returned message: "Health check matcher GRPC code can
    not be empty (Service: ElasticLoadBalancingV2, Status Code: 400, Reque
    st ID: 2f882cda-c03f-4a13-90fd-de57293579b7)" (RequestToken: 6e68ba66-
    1ac0-9126-8914-6128326c07f0, HandlerErrorCode: GeneralServiceException
    )

If I don't set the success_codes, AWS uses its default value of 12 which causes my health checks to fail.

Details:

AWS Region: us-east-2 type: Backend Service version: version: v1.34.0, built for darwin

Observed result:

Error when attempting to set the success code.

Expected result:

Target group health check is configured with the success code set to zero rather than 12.

Debugging:

I checked the source code and this file https://github.com/aws/copilot-cli/blob/b1c4c42cf1c47793a8181314a732312f3e3df1a7/internal/pkg/template/templates/workloads/partials/cf/alb.yml#L43 seems to imply that it should be set using the http.additional_rules but when I tried that as in the following:

    http:
      version: grpc
      path: /
      additional_rules:
        - healthcheck:
            path: "/grpc.health.v1.Health/Check"
            success_codes: "0"

I get the following error:

✘ validate manifest against environment "staging": validate "http": validate "additional_rules[0]": "path" must be specified

[erikhansenmujica]

Did you manage to sort a way out of this?

[proof-nicholas]

Yes, I used the override capability (cfn.patches.yml) for my service to set it to 0 as in the following:

- op: add
  path: /Resources/TargetGroup/Properties/Matcher
  value:
    GrpcCode: 0