terraform/cloud-functions/distributed/app-project/main.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.
 */

terraform {
  required_providers {
    google = {
      source  = "hashicorp/google"
      version = "6.24.0"
    }
  }
}

provider "google" {
  project = var.project_id
  region  = var.region
}

data "terraform_remote_state" "autoscaler" {
  backend = "local"

  config = {
    path = "../autoscaler-project/terraform.tfstate"
  }
}

module "autoscaler-network" {
  count  = var.terraform_memorystore_cluster ? 1 : 0
  source = "../../../modules/autoscaler-network"

  region     = var.region
  project_id = var.project_id
  ip_range   = var.ip_range

  memorystore_engine = var.memorystore_engine // Required for PSC service class
}

module "autoscaler-memorystore-cluster" {
  source = "../../../modules/autoscaler-memorystore-cluster"

  region                   = var.region
  project_id               = var.project_id
  memorystore_cluster_name = var.memorystore_cluster_name

  network    = var.terraform_memorystore_cluster ? one(module.autoscaler-network).network : null
  subnetwork = var.terraform_memorystore_cluster ? one(module.autoscaler-network).subnetwork : null
  dns_zone   = var.terraform_memorystore_cluster ? one(module.autoscaler-network).dns_zone : null

  terraform_memorystore_cluster = var.terraform_memorystore_cluster

  poller_sa_email = data.terraform_remote_state.autoscaler.outputs.poller_sa_email
  scaler_sa_email = data.terraform_remote_state.autoscaler.outputs.scaler_sa_email

  memorystore_shard_count   = var.memorystore_shard_count
  memorystore_replica_count = var.memorystore_replica_count
  memorystore_engine        = var.memorystore_engine

  depends_on = [module.autoscaler-network]
}

module "autoscaler-test-vm" {
  count  = var.terraform_test_vm && var.terraform_memorystore_cluster ? 1 : 0
  source = "../../../modules/autoscaler-test-vm"

  region     = var.region
  project_id = var.project_id
  name       = var.terraform_test_vm_name
  network    = one(module.autoscaler-network).network
  subnetwork = one(module.autoscaler-network).subnetwork
}

module "autoscaler-monitoring" {
  count  = var.terraform_dashboard ? 1 : 0
  source = "../../../modules/autoscaler-monitoring"

  region                   = var.region
  project_id               = var.project_id
  memorystore_cluster_name = var.memorystore_cluster_name
  memorystore_engine       = var.memorystore_engine
}

module "autoscaler-scheduler" {
  source = "../../../modules/autoscaler-scheduler"

  project_id               = var.project_id
  location                 = var.region
  memorystore_cluster_name = var.memorystore_cluster_name
  memorystore_engine       = var.memorystore_engine
  state_project_id         = var.state_project_id
  pubsub_topic             = module.autoscaler-forwarder.forwarder_topic
  target_pubsub_topic      = data.terraform_remote_state.autoscaler.outputs.scaler_topic

  terraform_spanner_state  = var.terraform_spanner_state
  spanner_state_name       = var.spanner_state_name
  spanner_state_database   = var.spanner_state_database
  firestore_state_database = var.firestore_state_database

  // Example of passing config as json
  // json_config             = base64encode(jsonencode([{
  //   "projectId": "${var.project_id}",
  //   "instanceId": "${module.autoscaler-memorystore-cluster.memorystore_cluster_name}",
  //   "scalerPubSubTopic": "${module.autoscaler-functions.scaler_topic}",
  //   "units": "SHARDS",
  //   "minSize": 3
  //   "maxSize": 30,
  //   "scalingMethod": "LINEAR"
  // }]))
}

module "autoscaler-forwarder" {
  source = "../../../modules/autoscaler-forwarder"

  project_id          = var.project_id
  region              = var.region
  target_pubsub_topic = data.terraform_remote_state.autoscaler.outputs.poller_topic
}