functionapprest

Python routing mini-framework for MS Azure Functions with optional JSON-schema validation.

** This repository is based heavily on lambdarest project

Features

• functionapp_handler function constructor with built-in dispatcher
• Decorator to register functions to handle HTTP methods
• Optional JSON-schema input validation using same decorator

Installation

Install the package from PyPI using pip:

pip install functionapprest

Getting Started

This module helps you to handle different HTTP methods in your Azure Functions.

from functionapprest import functionapp_handler

@functionapp_handler.handle('get')
def my_own_get(event):
    return {'this': 'will be json dumped'}

Advanced Usage

Optionally you can validate an incoming JSON body against a JSON schema:

my_schema = {
    '$schema': 'http://json-schema.org/draft-04/schema#',
    'type': 'object',
    'properties': {
        'body':{
            'type': 'object',
            'properties': {
                'foo': {
                    'type': 'string'
                }
            }
        }
    }
}

@functionapp_handler.handle('get', path='/with-schema/', schema=my_schema)
def my_own_get(event):
    return {'this': 'will be json dumped'}

Query Params

Query params are also analyzed and validate with JSON schemas. Query arrays are expected to be comma separated, all numbers are converted to floats.

my_schema = {
    '$schema': 'http://json-schema.org/draft-04/schema#',
    'type': 'object',
    'properties': {
        'query':{
            'type': 'object',
            'properties': {
                'foo': {
                    'type': 'array',
                    'items': {
                        'type': 'number'
                    }
                }
            }
        }
    }
}

@functionapp_handler.handle('get', path='/with-params/', schema=my_schema)
def my_own_get(event):
    return event.json['query']

Routing

You can also specify which path to react on for individual handlers using the path param:

@functionapp_handler.handle('get', path='/foo/bar/baz')
def my_own_get(event):
    return {'this': 'will be json dumped'}

And you can specify path parameters as well, which will be passed as keyword arguments:

@functionapp_handler.handle('get', path='/foo/<int:id>/')
def my_own_get(event, id):
    return {'my-id': id}

Or use the proxy endpoint:

@functionapp_handler.handle('get', path='/bar/<path:path>')
def my_own_get(event, path):
    return {'path': path}

Using within Function App

function.json

{
  "scriptFile": "handler.py",
  "bindings": [
    {
      "authLevel": "anonymous",
      "type": "httpTrigger",
      "direction": "in",
      "name": "req",
      "methods": [
        "get"
      ],
      "route": "products/{product_id}"
    },
    {
      "type": "http",
      "direction": "out",
      "name": "$return"
    }
  ]
}

handler.py

from functionapprest import functionapp_handler, Request

@functionapp_handler.handle('get', path='/products/<path:product_id>/')
def list_products(req: Request, product_id):
    query = req.json.get('query', {})
    body = req.json.get('body', {})
    headers = req.get('headers', {})
    params = req.get('params', {})
    response = {
        'method': req.method,
        'url': req.url,
        'headers': headers,
        'params': params,
        'query': query,
        'body': body
    }
    return response

main = functionapp_handler

Tests

You can use pytest to run tests against your current Python version. To run tests for current python version run pytest

See setup.py for test dependencies and install them with pipenv install --dev.

Contributors

eduardomourar