Creation of two Lambda Layers to import external libraries to the Lambda Fuction. The directory structure should be like this:
layers
| cx_Oracle
| python
| lib
| python3.8
| site-packages
| <external dependencies>
| oracle_client
| lib
| <external dependencies>
The Lambda Function code is located in the functions
directory.
The cdk.json
file tells the CDK Toolkit how to execute your app.
This project is set up like a standard Python project. The initialization
process also creates a virtualenv within this project, stored under the .venv
directory. To create the virtualenv it assumes that there is a python3
(or python
for Windows) executable in your path with access to the venv
package. If for any reason the automatic creation of the virtualenv fails,
you can create the virtualenv manually.
To manually create a virtualenv on MacOS and Linux:
$ python3 -m venv .venv
After the init process completes and the virtualenv is created, you can use the following step to activate your virtualenv.
$ source .venv/bin/activate
If you are a Windows platform, you would activate the virtualenv like this:
% .venv\Scripts\activate.bat
Once the virtualenv is activated, you can install the required dependencies.
$ pip install -r requirements.txt
At this point you can now synthesize the CloudFormation template for this code.
$ cdk synth
To add additional dependencies, for example other CDK libraries, just add
them to your setup.py
file and rerun the pip install -r requirements.txt
command.
cdk ls
list all stacks in the appcdk synth
emits the synthesized CloudFormation templatecdk deploy
deploy this stack to your default AWS account/regioncdk diff
compare deployed stack with current statecdk docs
open CDK documentation
- Creating a function with runtime dependencies: https://docs.aws.amazon.com/lambda/latest/dg/python-package-create.html#python-package-create-with-dependency
- Using AWS Lambda environment variables: https://docs.aws.amazon.com/lambda/latest/dg/configuration-envvars.html
- cx_Oracle 8 Installation: https://cx-oracle.readthedocs.io/en/latest/user_guide/installation.html
- AWS Lambda Construct Library: https://docs.aws.amazon.com/cdk/api/latest/python/aws_cdk.aws_lambda/README.html
- How to provision Lambda and Lambda Layer using CDK: https://dev.to/upupkenchoong/how-to-provision-lambda-and-lambda-layer-with-cdk-2ff4
Enjoy!