Cross-resource references to handle multiple types

[muvaf]

What problem are you facing?

There are fields in some resources that could be fulfilled by different types, i.e. ARN of Instance or NetworkInterface or LoadBalancer could be given. However, cross-resource resolver always works with a singe hard-coded type so you have to use composition to patch those fields.

How could Crossplane help solve your problem?

We could either solve this via generic patching or implement https://github.com/crossplane/crossplane-runtime/issues/341 and have per-type resolver logic in the code so that we don't have to ask for fieldpaths, transforms etc.

[Kerwood]

When creating an Opsgenie Escalation the recipient type can be either user, team or schedule, but Crossplane only supports a single cross-resource reference per "block", in this case rules.recipient.

Below is an example on how it could look like with multi cross-resource reference.

...
spec:
  forProvider:
    name: Escalation Name
    rules:
      - recipient:
          - type: user
            userIdRef:
              name: user-name

          - type: team
            teamIdRef:
              name: team-name

          - type: schedule
            scheduleIdRef:
              name: schedule-name

Terraform example.

resource "opsgenie_escalation" "test" {
  name          = "genieescalation-%s"
  description   = "test"
  owner_team_id = "${opsgenie_team.test.id}"

  rules {
    condition   = "if-not-acked"
    notify_type = "default"
    delay       = 1

    recipient {
      type = "user"
      id   = "${opsgenie_user.test.id}"
    }

    recipient {
      type = "team"
      id   = "${opsgenie_team.test.id}"
    }

    recipient {
      type = "schedule"
      id   = "${opsgenie_schedule.test.id}"
    }
  }

https://registry.terraform.io/providers/opsgenie/opsgenie/latest/docs/resources/escalation

[haarchri]

the same we have in provider-pagerduty

    rule:
    - escalationDelayInMinutes: 10
      target:
      - id: ${pagerduty_user.example.id}
        type: user_reference
      - id: ${pagerduty_user.example2.id}
        type: user_reference

[haarchri]

in official-provider upbound/provider-aws we can see the same

https://marketplace.upbound.io/providers/upbound/provider-aws-directconnect/v0.36.0/resources/directconnect.aws.upbound.io/GatewayAssociation/v1beta1#doc:spec-forProvider-associatedGatewayId

associatedGatewayId is possible to match multiple resource types

today its only possible to select / reference one resource type https://marketplace.upbound.io/providers/upbound/provider-aws-directconnect/v0.36.0/resources/directconnect.aws.upbound.io/GatewayAssociation/v1beta1#doc:spec-forProvider-associatedGatewayIdRef

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