[AWS Step Functions]Terraformでネストしたステートマシンを作成してみた

├── asls・・・ステートマシンの定義ファイル格納フォルダ
│   ├── main_state.asl.json・・・親ステートマシン定義ファイル
│   └── nested_state.asl.json・・・子ステートマシン定義ファイル
├── modules・・・Module格納用フォルダ
│   └── statemachine・・・ステートマシンModule格納用フォルダ
│       ├── main.tf
│       ├── outputs.tf
│       └── variables.tf
├── main.tf
├── outputs.tf
└── variables.tf

variable "name" {
  description = "Name of the State Machine"
  type        = string
}

variable "role_arn" {
  description = "ARN of the IAM role for the State Machine"
  type        = string
}

variable "definition_file" {
  description = "Path to the JSON file containing the State Machine definition"
  type        = string
}

variable "definition_vars" {
  description = "Map of variables to replace in the State Machine definition"
  type        = map(string)
  default     = {}
}

# ---------------------------------------------
# ステートマシン(Module)
# ---------------------------------------------
resource "aws_sfn_state_machine" "this" {
  name     = var.name
  role_arn = var.role_arn

  # 引数で定義ファイル名と置換するパラメータを受け取る
  definition = templatefile(var.definition_file, var.definition_vars)
}

output "arn" {
  description = "ARN of the State Machine"
  value       = aws_sfn_state_machine.this.arn
}

{
  "StartAt": "ExecuteNestedStateMachine",
  "States": {
    "ExecuteNestedStateMachine": {
      "Type": "Task",
      "Resource": "arn:aws:states:::states:startExecution.sync:2",
      "Parameters": {
        "StateMachineArn": "${nested_state_machine_arn}",
        "Input": {
          "AWS_STEP_FUNCTIONS_STARTED_BY_EXECUTION_ID.$": "$$.Execution.Id"
        }
      },
      "ResultPath": "$.nested",
      "End": true
    }
  }
}

{
  "StartAt": "WaitState",
  "States": {
    "WaitState": {
      "Type": "Wait",
      "Seconds": 10,
      "Next": "PassState"
    },
    "PassState": {
      "Type": "Pass",
      "Result": {
        "message": "Nested execution completed"
      },
      "End": true
    }
  }
}

# ---------------------------------------------
# 親ステートマシン
# ---------------------------------------------
module "main_state" {
  source          = "./modules/statemachine"
  name            = "main_state"
  role_arn        = aws_iam_role.state_machine_role.arn
  definition_file = "./asls/main_state.asl.json"
  definition_vars = {
    nested_state_machine_arn = module.nested_state.arn
  }
}

# ---------------------------------------------
# 子ステートマシン
# ---------------------------------------------
module "nested_state" {
  source          = "./modules/statemachine"
  name            = "nested_state"
  role_arn        = aws_iam_role.state_machine_role.arn
  definition_file = "./asls/nested_state.asl.json"
  definition_vars = {}
}

aws stepfunctions start-execution --state-machine-arn <親ステートマシンのARN>