leangle

An add-on for chalice to improve documentation of an API Gateway.

As of version 1.13.0, chalice does not support models for the request or response. This means any documentation generated for an API Gateway is going to be much less useful.

leangle improves this with a collection of decorators for chalice route functions, and built-in support for marshmallow schemas.

Installation

Via pip:

pip install leangle

Chalice itself is an optional dependency. This can be useful for testing and validation, but should not be used for the version of chalice deployed to AWS.

pip install leangle[chalice]

Describe API Parameters

API Responses can be described with the describe.parameter decorator. They will be added as documentation to the API Gateway. They should go after the route decorator, and can be stacked.

import leangle


@app.route('/', methods=['POST'])
@leangle.describe.parameter(name='body', _in='body', description='Create a new widget', schema='WidgetSchema')
def index():
    return Response(status_code=201)

Describing the 'in' field of a parameter

_in is used, as in is a reserved word in Python.

Describe API Responses

API Responses can be described with the describe.response decorator. They will be added as documentation to the API Gateway. They should go after the route decorator, and can be stacked.

import leangle


@app.route('/', methods=['POST'])
@leangle.describe.response(201, description='Created')
@leangle.describe.response(422, description='Missing Parameter')
def index():
    return Response(status_code=201)

Describe Method Tags

import leangle


@app.route('/', methods=['POST'])
@leangle.describe.tags(["x-large"])
def index():
    return Response(status_code=201)

Add schemas

Schema objects can be defined using marshmallow

When decorated with the add_schema decorator, they will be added as models to the API Gateway.

The name of these Schema classes can be used in the describe decorators.

import leangle
from marshmallow import Schema, fields


@leangle.add_schema()
class BaseSchema(Schema):
    name = fields.Str()


@app.route('/', methods=['POST'])
@leangle.describe.response(201, description='Created', schema='BaseSchema')
def index():
    return Response(status_code=201)