Deploys CRUD handlers with Lambda functions

In previous step, you have deployed the UsersListHandler, in this step you will complete the CRUD operations for users resource by deploying other Lambda functions:

• UserGetHandler
• UserCreateHandler
• UserUpdateHandler
• UserDeleteHandler

Table of Content

Add CDK code for the CRUD handlers

• In the CDK stack file (cdk-workshop-stack.ts), inside the constructor:

  • Below code for UsersListHandler Lambda function, add the following code:

    const userGet = new Function(this, "UserGetHandler", {
      runtime: Runtime.PYTHON_3_13,
      code: Code.fromAsset("lambda/users/get"),
      handler: "lambda_function.lambda_handler",
      environment: {
        USERS_TABLE: table.tableName,
      },
    });
    const userCreate = new Function(this, "UserCreateHandler", {
      runtime: Runtime.PYTHON_3_13,
      code: Code.fromAsset("lambda/users/create"),
      handler: "lambda_function.lambda_handler",
      environment: {
        USERS_TABLE: table.tableName,
      },
    });
    const userUpdate = new Function(this, "UserUpdateHandler", {
      runtime: Runtime.PYTHON_3_13,
      code: Code.fromAsset("lambda/users/update"),
      handler: "lambda_function.lambda_handler",
      environment: {
        USERS_TABLE: table.tableName,
      },
    });
    const userDelete = new Function(this, "UserDeleteHandler", {
      runtime: Runtime.PYTHON_3_13,
      code: Code.fromAsset("lambda/users/delete"),
      handler: "lambda_function.lambda_handler",
      environment: {
        USERS_TABLE: table.tableName,
      },
    });
    

  • Below line of table.grantReadData(usersList);, add the following code:

    table.grantReadData(userGet);
    table.grantReadWriteData(userCreate);
    table.grantReadWriteData(userUpdate);
    table.grantReadWriteData(userDelete);
    

[Optional] Run cdk diff to check the difference

• Run cdk diff to see the change set

  cdk diff
  

Run cdk deploy to deploy your CDK stack

• Run cdk deploy to deploy your CDK stack with lambda functions and the IAM permissions for other CRUD operations.

  cdk deploy
  

• Type in y and press Enter.

Verify the handlers are deployed

• Go to CloudFormation Console, check CdkWorkshopStack, in the Resources tab, you will see UsersListHandler and other Lambda functions.