Lambda Example using AWS CDK

In this article we are going to cover some of the most common properties we use to create and configure an lambda in AWS CDK.

At the time of writing I was using CDK version: 2.34.2

Importing Dependencies

from aws_cdk import ( aws_iam as iam,aws_lambda as lambda_,     aws_lambda_destinations as destinations, )

Lambda Role

lambda_role = iam.Role(
            self,
            "lambda-role",
            assumed_by=iam.CompositePrincipal(
                iam.ServicePrincipal("lambda.amazonaws.com"),
            ),
        )

        lambda_role.add_to_policy(
            iam.PolicyStatement(actions=["sns:Publish"], resources=[snstopic])
        )

        )
        lambda_role.add_managed_policy(
            iam.ManagedPolicy.from_aws_managed_policy_name(
                "service-role/AWSLambdaBasicExecutionRole"
            )
        )

Create Lambda

snstopic = "<SNS_TOPIC_ARN>"
lambda_.Function(
            self,
            "lambda-function",
            runtime=lambda_.Runtime.PYTHON_3_9,
            code=lambda_.Code.from_asset("resources/lambda"),
            role=lambda_role,
            handler="lambda_function.lambda_handler",
            timeout=Duration.seconds(600),
            environment={"snstopic": snstopic},
            on_failure=destinations.SnsDestination(
                sns.Topic.from_topic_arn(self, "LambdaSNSTopic", snstopic)
            ),
        )

Create Layer

        model_layer = lambda_.LayerVersion(
            self,
            "model-layer",
            code=lambda_.Code.from_asset("resources/model-layer"),
            compatible_runtimes=[lambda_.Runtime.PYTHON_3_9],
           
        )