Chalice Quickstart

• http://chalice.readthedocs.io/en/latest/quickstart.html
• https://aws.amazon.com/blogs/developer/category/python/
• http://chalice.readthedocs.io/en/latest/
• http://chalice.readthedocs.io/en/latest/api.html

Hello World

• chalice new-project hellochalice
• chalice deploy
• http https://19bdrm9ink.execute-api.ap-southeast-2.amazonaws.com/api/

Hello Seattle

• http https://19bdrm9ink.execute-api.ap-southeast-2.amazonaws.com/api/cities/seattle

Error Handling

• BadRequestError - return a status code of 400
• UnauthorizedError - return a status code of 401
• ForbiddenError - return a status code of 403
• NotFoundError - return a status code of 404
• ConflictError - return a status code of 409
• TooManyRequestsError - return a status code of 429
• ChaliceViewError - return a status code of 500

Requests

The app.current_request object also has the following properties.

• current_request.query_params - A dict of the query params for the request.
• current_request.headers - A dict of the request headers.
• current_request.uri_params - A dict of the captured URI params.
• current_request.method - The HTTP method (as a string).
• current_request.json_body - The parsed JSON body (json.loads(raw_body))
• current_request.raw_body - The raw HTTP body as bytes.
• current_request.context - A dict of additional context information
• current_request.stage_vars - Configuration for the API Gateway stage

CORS

• You can specify whether a view supports CORS by adding the cors=True parameter to your @app.route() call.
• By default this value is false.
• If more fine grained control of the CORS headers is desired, set the cors parameter to an instance of CORSConfig instead of True.
• The CORSConfig object can be imported from the chalice package.

Libraries

• To add a code library use import chalicelib.xxxx
• Then create a directory called chalicelib containing xxxx.py and __init__.py
• http://chalice.readthedocs.io/en/latest/topics/multifile.html

Authorization

• None
• chalice.IamAuthorizer()
• chalice.CognitoUserPoolAuthorizer()

Adding Standalone Lambda functions

• Use the @app.lambda_function decorator
• Example in sample chalice-trivia app to autoconfirm_user

Other Features

• @app.schedule for cron
• Dependency management
• AWS IAM policy generation
• Throttle API Gateway to defend against DDOS

Environment Variables

• Set them in config.json: http://chalice.readthedocs.io/en/latest/topics/configfile.html#examples
• Use in your functions: https://docs.aws.amazon.com/lambda/latest/dg/env_variables.html

Generate Frontend Code

• Use chalice generate-sdk to generate frontend Javascript code
• Routes must have CORS enabled
• Example... http://chalice.readthedocs.io/en/latest/topics/sdks.html#example
• Build a frontend and deploy to S3/CloudFront

Sample Code

• https://www.youtube.com/watch?v=0fMJqWLE6Iw
• https://github.com/philenz/chalice-trivia.git (cloned from youtube sample)