aws_ecs_service empty dynamic service_registries block throws error

[cixelsyd]

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Terraform CLI and Terraform AWS Provider Version

Terraform v0.12.28
+ provider.aws v3.34.0

Affected Resource(s)

• aws_ecs_service

Terraform Configuration Files

  + resource "aws_ecs_service" "service" {
      + cluster                            = "cluster-name"
      + deployment_maximum_percent         = 200
      + deployment_minimum_healthy_percent = 100
      + desired_count                      = 1
      + enable_ecs_managed_tags            = false
      + enable_execute_command             = false
      + iam_role                           = (known after apply)
      + id                                 = (known after apply)
      + launch_type                        = "FARGATE"
      + name                               = "service-name"
      + platform_version                   = "1.4.0"
      + scheduling_strategy                = "REPLICA"
      + task_definition                    = "arn:aws:ecs:us-east-1:999999999999:task-definition/service-name:1"
      + wait_for_steady_state              = false

      + deployment_controller {
          + type = "CODE_DEPLOY"
        }

      + load_balancer {
          + container_name   = "service-name"
          + container_port   = 8080
          + target_group_arn = "arn:aws:elasticloadbalancing:us-east-1:999999999999:targetgroup/service-name-tg1/1111111111111111"
        }

      + network_configuration {
          + assign_public_ip = false
          + security_groups  = [
              + "sg-11111111111111111",
            ]
          + subnets          = [
              + "subnet-11111111111111111"
            ]
        }

      + service_registries {}
    }

Debug Output

Panic Output

Expected Behavior

I would expect terraform to ignore this empty service registry block:

service_registries {}

Actual Behavior

terraform threw an RPC error:

Error: rpc error: code = Canceled desc = context canceled

Steps to Reproduce

1. terraform apply

Important Factoids

I render these dynamic blocks inside a module by passing map objects in via tfvars files, like this:

  // this SHOULD work (we use this construction in other places)
  // but it does not. it renders this into the planout:
  // + service_registries {}
  // and that terraform convergence throws the following error:
  // Error: rpc error: code = Canceled desc = context canceled
  dynamic "service_registries" {
    for_each = length(regexall(".*", lookup(each.value.ecs-config, "registry_arn", ""))) > 0 ? [1] : []

    content {
      registry_arn = each.value.ecs-config.registry_arn
    }
  }

I use the ternary operator with the regex/length construction throughout multiple modules to render blocks based on if a particular setting is provided inside tfvars. I have not had issues in other places with this method.

References

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