how.wtf

Create Lambda Function URL using AWS CDK

· Thomas Taylor

Deploying Lambda Function URLs with the AWS CDK is simple.

How to deploy Function URLs using AWS Python CDK

Follow the instructions below to deploy an AWS Lambda Function with a URL.

Create a requirements.txt

For this tutorial, version 2.106.1 of the AWS CDK was used.

1aws-cdk-lib==2.106.1
2constructs>=10.0.0,<11.0.0

Install the dependencies

1pip3 install -r requirements.txt

Create /handler folder with an index.py file

1def handler(event, context):
2    return {
3        "statusCode": 200,
4        "body": {"message": "👋"}
5    }

Create stack.py with a basic lambda function

 1from os import path
 2
 3import aws_cdk as cdk
 4import aws_cdk.aws_lambda as lambda_
 5
 6
 7class FunctionUrlStack(cdk.Stack):
 8    def __init__(self, scope: cdk.App, construct_id: str, **kwargs) -> None:
 9        super().__init__(scope, construct_id, **kwargs)
10
11        lambda_function = lambda_.Function(
12            self,
13            "Function",
14            runtime=lambda_.Runtime.PYTHON_3_11,
15            handler="index.handler",
16            code=lambda_.Code.from_asset(path.join(path.dirname(__file__), "handler")),
17        )
18
19        function_url = lambda_function.add_function_url(
20            auth_type=lambda_.FunctionUrlAuthType.NONE
21        )
22
23        cdk.CfnOutput(self, "FunctionUrl", value=function_url.url)

Create app.py

1import aws_cdk as cdk
2
3from stack import FunctionUrlStack
4
5app = cdk.App()
6FunctionUrlStack(app, "FunctionUrlStack")
7
8app.synth()

Create cdk.json

1{
2  "app": "python3 app.py"
3}

The directory structure should look like this:

1project/
2├── app.py
3├── cdk.json
4├── handler
5│   └── index.py
6├── requirements.txt
7└── stack.py

Deploy the stack

1cdk deploy

Because of the CfnOutput, the distribution’s domain name is in an output:

1Outputs:
2FunctionUrlStack.FunctionUrl = https://<url>.lambda-url.us-east-1.on.aws/

The link will display the following text:

1{
2    "message": "👋"
3}

#python   #aws   #aws-cdk   #serverless  

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