AWS lambda api gateway deployment via AWS CDK

2022, Sep 19    

Prerequisites

• Linux environment( tested on MacOS M1 )
• Python 3.8
• CDK installed Instructions
• Code for this reference example

Creating Virtual Environment for installing the Python dependencies

python3 -m venv .venv

Installing the Python dependencies

pip install -r requirements-dev.txt
pip install -r requirements.txt

requirements-dev.txt file contains the PyTest PyTest is being used for a simple Unit Test use case against our Infrastructure

Initialising the CDK environment

cdk bootstrap

Preview the preview of the compiled Cloudformation template ( baed on Python code)

cdk synth

Run PyTest tests

Run unit tests in tests/unit/test_cdk_multienv_setup_stack.py file :

pytest

This checks if API Gateway Method exists in compiled Cloudformation template & Lambda has Function name OrderGet and runtime of python 3.8

Deploy the stack to your AWS account

cdk deploy

After deployment you will see the Outputs section :

✨  Deployment time: 43.47s
Outputs:
cdk-multienv.orderapiEndpointE2C47C71 = https://exampleyteye.execute-api.us-east-1.amazonaws.com/prod/

In this output, the value of “cdk-multienv.orderapiEndpointE2C47C71” is the API Gateway Stage endpoint URL.

We have a “Get” method defined at path “/order” in cdk_multienv_setup/cdk_multienv_setup_stack.py

Testing the deployment

curl https://exampleyteye.execute-api.us-east-1.amazonaws.com/prod/order

Succesful response would return :

Transaction: id-12314124124124

This sends the request to API Gateway Endpoint, which forwards it to our Lambda function

Links :

https://docs.pytest.org/en/7.1.x/ https://docs.aws.amazon.com/cdk/v2/guide/work-with-cdk-python.html

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