crud_stepfn.asl.json

{
  "Comment": "Amazon state language definition",
  "StartAt": "InitState",
  "States": {
    "InitState": {
      "Type": "Pass",
      "Next": "Request Method"
    },
    "Request Method": {
      "Type": "Choice",
      "Choices": [
        {
          "And": [
            {
              "Variable": "$.requestContext.httpMethod",
              "StringEquals": "GET"
            },
            {
              "Variable": "$.requestContext.resourcePath",
              "StringEquals": "/warehouses"
            }
          ],
          "Next": "ListWarehouses"
        },
        {
          "And": [
            {
              "Variable": "$.requestContext.httpMethod",
              "StringEquals": "GET"
            },
            {
              "Variable": "$.requestContext.resourcePath",
              "StringEquals": "/products"
            }
          ],
          "Next": "ListProducts"
        },
        {
          "And": [
            {
              "Variable": "$.requestContext.httpMethod",
              "StringEquals": "GET"
            },
            {
              "Variable": "$.requestContext.resourcePath",
              "StringEquals": "/product/{product_id}"
            }
          ],
          "Next": "GetProduct"
        },
        {
          "And": [
            {
              "Variable": "$.requestContext.httpMethod",
              "StringEquals": "GET"
            },
            {
              "Variable": "$.requestContext.resourcePath",
              "StringEquals": "/warehouse/{warehouse_id}"
            }
          ],
          "Next": "GetWarehouse"
        },
        {
          "Variable": "$.requestContext.httpMethod",
          "StringEquals": "POST",
          "Next": "GenerateId"
        }
      ]
    },
    "ListWarehouses": {
      "Type": "Task",
      "Parameters": {
        "TableName": "InventoryUpdates",
        "KeyConditionExpression": "PK = :pk AND begins_with(SK, :sk)",
        "ExpressionAttributeValues": {
          ":pk": {
            "S": "WAREHOUSE"
          },
          ":sk": {
            "S": "WAREHOUSE#"
          }
        }
      },
      "Resource": "arn:aws:states:::aws-sdk:dynamodb:query",
      "Retry": [
        {
          "ErrorEquals": ["States.All"],
          "IntervalSeconds": 1,
          "MaxAttempts": 1
        }
      ],
      "ResultPath": "$.warehouses",
      "ResultSelector": {
        "statusCode": 200,
        "product.$": "$.Items"
      },
      "OutputPath": "$.warehouses",
      "End": true
    },
    "ListProducts": {
      "Type": "Task",
      "Parameters": {
        "TableName": "InventoryUpdates",
        "IndexName": "product-index",
        "KeyConditionExpression": "GSI1_PK = :gsi1_pk AND begins_with(GSI1_SK, :gsi1_sk)",
        "ExpressionAttributeValues": {
          ":gsi1_pk": {
            "S": "PRODUCT"
          },
          ":gsi1_sk": {
            "S": "PRODUCT#"
          }
        }
      },
      "Resource": "arn:aws:states:::aws-sdk:dynamodb:query",
      "Retry": [
        {
          "ErrorEquals": ["States.All"],
          "IntervalSeconds": 1,
          "MaxAttempts": 1
        }
      ],
      "ResultPath": "$.products",
      "ResultSelector": {
        "statusCode": 200,
        "product.$": "$.Items"
      },
      "OutputPath": "$.products",
      "End": true
    },
    "GetProduct": {
      "Type": "Task",
      "Parameters": {
        "TableName": "InventoryUpdates",
        "IndexName": "product-index",
        "KeyConditionExpression": "GSI1_PK = :gsi1_pk AND begins_with(GSI1_SK, :gsi1_sk)",
        "ExpressionAttributeValues": {
          ":gsi1_pk": {
            "S": "PRODUCT"
          },
          ":gsi1_sk": {
            "S.$": "States.Format('PRODUCT#{}', $.path.product_id)"
          }
        }
      },
      "Resource": "arn:aws:states:::aws-sdk:dynamodb:query",
      "Retry": [
        {
          "ErrorEquals": ["States.All"],
          "IntervalSeconds": 1,
          "MaxAttempts": 1
        }
      ],
      "ResultPath": "$.product",
      "ResultSelector": {
        "statusCode": 200,
        "product.$": "$.Items"
      },
      "OutputPath": "$.product",
      "End": true
    },
    "GetWarehouse": {
      "Type": "Task",
      "Parameters": {
        "TableName": "InventoryUpdates",
        "KeyConditionExpression": "PK = :pk AND begins_with(SK, :sk)",
        "ExpressionAttributeValues": {
          ":pk": {
            "S": "WAREHOUSE"
          },
          ":sk": {
            "S.$": "States.Format('WAREHOUSE#{}', $.path.warehouse_id)"
          }
        }
      },
      "Resource": "arn:aws:states:::aws-sdk:dynamodb:query",
      "Retry": [
        {
          "ErrorEquals": ["States.All"],
          "IntervalSeconds": 1,
          "MaxAttempts": 1
        }
      ],
      "ResultPath": "$.warehouse",
      "ResultSelector": {
        "statusCode": 200,
        "product.$": "$.Items"
      },
      "OutputPath": "$.warehouse",
      "End": true
    },
    "GenerateId": {
      "Type": "Pass",
      "Parameters": {
        "id.$": "States.UUID()"
      },
      "ResultPath": "$.key",
      "Next": "CreateChoice"
    },

    "CreateChoice": {
      "Type": "Choice",
      "Choices": [
        {
          "Variable": "$.requestContext.resourcePath",
          "StringEquals": "/product",
          "Next": "CreateProduct"
        },
        {
          "Variable": "$.requestContext.resourcePath",
          "StringEquals": "/warehouse",
          "Next": "CreateWarehouse"
        },
        {
          "Variable": "$.requestContext.resourcePath",
          "StringEquals": "/order",
          "Next": "PlaceOrder"
        }
      ]
    },
    "CreateWarehouse": {
      "Type": "Task",
      "Parameters": {
        "TableName": "InventoryUpdates",
        "Item": {
          "PK": {
            "S": "WAREHOUSE"
          },
          "SK": {
            "S.$": "States.Format('WAREHOUSE#{}', $.key.id)"
          },
          "warehouseName": {
            "S.$": "$.body.warehouseName"
          },
          "warehouseDescription": {
            "S.$": "$.body.warehouseDescription"
          },
          "id": {
            "S.$": "$.key.id"
          },
          "createdOn": {
            "S.$": "$$.State.EnteredTime"
          }
        }
      },
      "Resource": "arn:aws:states:::aws-sdk:dynamodb:putItem",
      "Retry": [
        {
          "ErrorEquals": ["States.All"],
          "IntervalSeconds": 1,
          "MaxAttempts": 1
        }
      ],
      "ResultSelector": {
        "statusCode": 200,
        "message": "Warehouse created successfully"
      },
      "ResultPath": "$.body",
      "OutputPath": "$.body",
      "End": true
    },
    "CreateProduct": {
      "Type": "Task",
      "Parameters": {
        "TableName": "InventoryUpdates",
        "Item": {
          "PK": {
            "S.$": "States.Format('WAREHOUSE#{}', $.body.warehouseId)"
          },
          "SK": {
            "S.$": "States.Format('PRODUCT#{}', $.key.id)"
          },
          "productName": {
            "S.$": "$.body.productName"
          },
          "productDescription": {
            "S.$": "$.body.productDescription"
          },
          "productPrice": {
            "N.$": "States.JsonToString($.body.productPrice)"
          },
          "id": {
            "S.$": "$.key.id"
          },  
          "categoryName": {
            "S.$": "$.body.categoryName"
          },
          "productQuantity": {
            "N.$": "States.JsonToString($.body.productQuantity)"
          },
          "createdOn": {
            "S.$": "$$.State.EnteredTime"
          },
          "productImage": {
            "S.$": "$.body.productImage"
          },
          "GSI1_PK": {
            "S": "PRODUCT"
          },
          "GSI1_SK": {
            "S.$": "States.Format('PRODUCT#{}', $.key.id)"
          }
        }
      },
      "Resource": "arn:aws:states:::aws-sdk:dynamodb:putItem",
      "Retry": [
        {
          "ErrorEquals": ["States.All"],
          "IntervalSeconds": 1,
          "MaxAttempts": 1
        }
      ],
      "ResultSelector": {
        "statusCode": 200,
        "message": "Product created successfully"
      },
      "ResultPath": "$.body",
      "OutputPath": "$.body",
      "End": true
    },
    "PlaceOrder": {
      "Type": "Task",
      "Resource": "arn:aws:states:::states:startExecution",
      "Parameters": {
        "StateMachineArn": "arn:aws:states:eu-west-2:132260253285:stateMachine:InventoryOrderStateMachine",
        "Input": {
          "StatePayload.$": "$",
          "AWS_STEP_FUNCTIONS_STARTED_BY_EXECUTION_ID.$": "$$.Execution.Id"
        }
      },
      "ResultSelector": {
        "statusCode": 200,
        "message": "Ordered successfully. Confirmation message sent to you email."
      },
      "ResultPath": "$.body",
      "OutputPath": "$.body",
      "End": true
    }
  }
}