infra/terraform/modules/a3/cluster/gke/kubectl-apply/aiinfra-ksa.tf

/*
 Copyright 2024 Google LLC

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

      https://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */

locals {
  split_cluster_id = split("/", var.cluster_id)
  kube_host = var.enable ? (
    "https://${data.google_container_cluster.gke_cluster[0].endpoint}"
  ) : ""
  kube_cert = var.enable ? base64decode(
    data.google_container_cluster.gke_cluster[0].master_auth.0.cluster_ca_certificate
  ) : ""
}

data "google_container_cluster" "gke_cluster" {
  count = var.enable ? 1 : 0

  project  = var.project_id
  name     = local.split_cluster_id[5]
  location = local.split_cluster_id[3]
}

data "google_client_config" "default" {}

provider "kubernetes" {
  host                   = local.kube_host
  cluster_ca_certificate = local.kube_cert
  token                  = data.google_client_config.default.access_token
}

provider "kubectl" {
  host                   = local.kube_host
  cluster_ca_certificate = local.kube_cert
  token                  = data.google_client_config.default.access_token
  load_config_file       = false
}

// Creating and Annotating KSA with google service account
resource "kubernetes_service_account" "ksa" {
  count = var.enable ? 1 : 0

  automount_service_account_token = false
  metadata {
    name      = var.ksa.name
    namespace = var.ksa.namespace
    annotations = {
      "iam.gke.io/gcp-service-account" = var.gcp_sa
    }
  }

  depends_on = [data.google_container_cluster.gke_cluster]
}

// Binding KSA to google service account.
resource "google_service_account_iam_binding" "default-workload-identity" {
  count = var.enable ? 1 : 0

  service_account_id = "projects/${var.project_id}/serviceAccounts/${var.gcp_sa}"
  role               = "roles/iam.workloadIdentityUser"
  members = [
    "serviceAccount:${var.project_id}.svc.id.goog[${var.ksa.namespace}/${var.ksa.name}]",
  ]

  depends_on = [resource.kubernetes_service_account.ksa]
}

data "http" "installer_daemonsets" {
  for_each = var.enable ? var.daemonsets : {}

  url = each.value
}

resource "kubectl_manifest" "installer_daemonsets" {
  for_each = var.enable ? var.daemonsets : {}

  yaml_body        = data.http.installer_daemonsets[each.key].response_body
  wait_for_rollout = false

  depends_on = [resource.google_service_account_iam_binding.default-workload-identity]
}