use redis credential_binding parameter in the app in the environment

[aharalambopoulos]

Hi

I have a resource and a binding from a redis on this

resource "cloudfoundry_app" "my_resource" {
..
service_bindings = [
{
service_instance : cloudfoundry_service_instance.redis_instance.name
}
]
..

environment = {
redis_host = "any_host.com"
}
}

a
data "cloudfoundry_service_credential_binding" "redis_binding" {
service_instance = cloudfoundry_service_instance.redis_instance.id
app = cloudfoundry_app.my_resource.id
}

output "redishost" {
jsondecode(data.cloudfoundry_service_credential_binding.redis_binding.credential_bindings[0].credential_binding)["credentials"]["hostname"]
sensitive = true

}

which works fine and I see the redishost with
terraform output redishost

But if I am trying to use this value in the cloudfoundry_app

environment = {
redis_host = jsondecode(data.cloudfoundry_service_credential_binding.redis_binding.credential_bindings[0].credential_binding)["credentials"]["hostname"]
}

I get
│ Error: Cycle: data.cloudfoundry_service_credential_binding.redis_binding, cloudfoundry_app.my_resource

How can I inject the

jsondecode(data.cloudfoundry_service_credential_binding.redis_binding.credential_bindings[0].credential_binding)["credentials"]["hostname"]

to
environment.redis_host

[Dray56]

Hi @iastinf ,

What is happening in this case is that a cyclic dependency exists due to which the script execution is not going through successfully.

redis_binding.app requires my_resource.id

my_resource.environment.redishost requires redis_binding.credential_bindings[0].credential_binding["credentials"]["hostname"]

Terraform is not able to figure out the order of creation of the resource and therefore fails.

This can be solved by either creating a service key for that instance, fetching its credential and then using that in the app as input else fetching the credential details from an already existing service_credential_binding of type app and not from an app which is about to be created.