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Local Development Server for AWS SAM Lambda Projects
- A developer has written a script to address the lack of a simple and quick way to locally test REST API built using AWS lambdas as request handlers, which can be heavy for quick iterations during development.
- The solution enables developers to test business logic and data validations, provides a local server for frontend developers to test against, and avoids adding overheads for rebuilding Docker images on every change. The python script creates a local Flask server, mapping the API Gateway routes to the Flask routes.
- The SAM template can be read to support Functions specific for SAM with added constructors for Ref as a reference to another object, Sub as method to substitute, and GetAtt to get attributes. Add Layers dynamically to path by reading Layers definitions.
- Creating Flask routes with each endpoint by looping throughout resources and finding all Functions.
- Potential issues highlighted: Lambda memory limitations and CPU; testing in a real environment is recommended. Approach should be used only to speed up the development process.
- Overall, the solution enables quick setup, direct execution, hot reload, and shortens the development feedback loop.
- Developers have been urged to share insights and feedback to improve the solution for everyone.
- The code is available on github, which developers can access to try this solution.
- Future updates are expected on the author’s blog.
- The author assures readers the script is very helpful and is looking for feedback to improve the solution for others.
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