Running WSGI Applications on AWS Lambda with apig-wsgi
Running WSGI applications on AWS Lambda can be a powerful way to leverage serverless computing for your web applications. With the apig-wsgi library, you can easily wrap your WSGI app in an AWS Lambda handler function and deploy it on either API Gateway or an Application Load Balancer (ALB). In this article, we will explore the installation, usage, and configuration of apig-wsgi for running your WSGI app on AWS Lambda.
Installation
To get started with apig-wsgi, you can use pip to install the library:
python -m pip install apig-wsgiapig-wsgi supports Python versions 3.8 to 3.12.
Usage
Once you have apig-wsgi installed, you can use it in your AWS Lambda function that you attach to one of the following:
- A Lambda Function URL
- An API Gateway “HTTP API”
- An API Gateway “REST API”
- An ALB
Both “format version 1” and “format version 2” are supported, and apig-wsgi can automatically detect the version in use. The library provides a make_lambda_handler() function that takes your WSGI app as input and returns a Lambda handler function.
Here’s an example of how to use apig-wsgi with a Django app:
from apig_wsgi import make_lambda_handler
from myapp.wsgi import app
# Configure this as your entry point in AWS Lambda
lambda_handler = make_lambda_handler(app)Configuration
apig-wsgi provides several configuration options for customizing your AWS Lambda function. You can define whether binary responses containing binary data are supported, configure non-binary content type prefixes, and access the event context and request information from API Gateway.
For example, you can configure binary support using the binary_support parameter:
# Configure binary support
lambda_handler = make_lambda_handler(app, binary_support=True)Additionally, if you need access to the full API Gateway event or the Lambda context object, you can retrieve them from the WSGI environ:
# Access full event from API Gateway
full_event = environ["apig_wsgi.full_event"]
# Access Lambda context object
context = environ["apig_wsgi.context"]Example Project
To help you get started with apig-wsgi, an example Django project with Ansible deployment is included in the library’s repository. You can find this example project in the example/ directory. The README file in the repository provides guidance on setting up and deploying the Django project with apig-wsgi.
Conclusion
apig-wsgi simplifies the process of running WSGI applications on AWS Lambda, allowing you to leverage the power of serverless computing for your web applications. With easy installation and configuration, apig-wsgi enables you to deploy your WSGI app on API Gateway or an ALB. Whether you’re building a small web application or a complex system, apig-wsgi is a valuable tool for integrating WSGI apps with AWS Lambda.
For more information and detailed documentation, please visit the apig-wsgi repository.
If you have any questions or need assistance, feel free to ask in the comments below.
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