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https://github.com/marwandebbiche/pylambdarest
Lightweight python framework for building REST API using AWS Lambda + API Gateway
https://github.com/marwandebbiche/pylambdarest
api-gateway aws-lambda rest-api serverless
Last synced: 7 days ago
JSON representation
Lightweight python framework for building REST API using AWS Lambda + API Gateway
- Host: GitHub
- URL: https://github.com/marwandebbiche/pylambdarest
- Owner: MarwanDebbiche
- License: mit
- Created: 2020-07-02T17:05:38.000Z (over 4 years ago)
- Default Branch: master
- Last Pushed: 2023-06-13T23:48:05.000Z (over 1 year ago)
- Last Synced: 2024-08-09T14:03:11.750Z (3 months ago)
- Topics: api-gateway, aws-lambda, rest-api, serverless
- Language: Python
- Homepage: https://pylambdarest.readthedocs.io
- Size: 1.36 MB
- Stars: 14
- Watchers: 3
- Forks: 4
- Open Issues: 12
-
Metadata Files:
- Readme: README.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
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README
# pylambdarest
[](https://github.com/MarwanDebbiche/pylambdarest/actions?query=branch:master)
[](https://coveralls.io/github/MarwanDebbiche/pylambdarest?branch=master)
[](https://pypi.python.org/pypi/pylambdarest)
[](https://pypi.org/project/pylambdarest/)
pylambdarest is a lightweight opinionated framework for building REST API using [AWS Lambda](https://aws.amazon.com/lambda/) and [API Gateway](https://aws.amazon.com/api-gateway/).
## Motivation
Why another framework ?
When using API Gateway and python Lambda functions, the most common pattern is to have a unique Lambda function triggered by a proxy API Gateway resource. The Lambda then uses a framework like [Flask](https://flask.palletsprojects.com/en/1.1.x/) to do all the routing. In an API Gateway + Lambda context, I feel like **the routing should be handled by API Gateway itself**, then forwarding the request to specific Lambda functions for each resource or endpoint.
## Features
- No routing. Yes, this is a feature. Routing should be handled by API Gateway.
- API Gateway event parsing (including request body and path parameters).
- Cleaner syntax.
- Optional body schema and query parameters validation.
## Installation
Install the package from PyPI using pip:
```
$ pip install pylambdarest
```
pylambdarest should also be included in the deployment package of your Lambda functions.
## Getting started
pylambdarest provides a `@route` decorator to parse the API Gateway event into a `Request` object available in the handler function as an argument. It also formats the handler's output to the expected Lambda + API Gateway format seamlessly.
Turning this:
```python
import json
def handler(event, context):
body = json.loads(event["body"])
query_params = event["queryStringParameters"]
path_params = event["pathParameters"]
return {
"statusCode": 200,
"body": json.dumps({
"message": f"Hello from AWS Lambda {body['name']}!!"
})
}
```
Into this:
```python
from pylambdarest import route
@route()
def handler(request):
body = request.json
query_params = request.query_params
path_params = request.path_params
return 200, {"message": f"Hello from AWS Lambda {body['name']}!!"}
```
You can still access the original `event` and `context` arguments from the handler:
```python
from pylambdarest import route
@route()
def handler(request, event, context):
print(event)
body = request.json
return 200, {"message": f"Hello from AWS Lambda {body['name']}!!"}
```
Path parameters defined in API Gateway can also be accessed directly as function argument:
```python
from pylambdarest import route
@route()
def get_user(user_id):
print(user_id)
# get user from db
user = {"id": user_id, "name": "John Doe"}
return 200, user
```
## Schema Validation
pylambdarest optionally provides schema validation using [jsonschema](https://github.com/Julian/jsonschema):
```python
from pylambdarest import route
user_schema = {
"type": "object",
"properties": {
"name": {"type": "string"}
},
"required": ["name"],
"additionalProperties": False
}
@route(body_schema=user_schema)
def create_user(request):
# If the request's body does not
# satisfy the user_schema,
# a 400 will be returned
# Create user here
return 201
query_params_schema = {
"type": "object",
"properties": {
# Only string types are allowed for query parameters.
# Types casting should be done in the handler.
"page": {"type": "string"}
},
"additionalProperties": False
}
@route(query_params_schema=query_params_schema)
def get_users(request):
page = int(request.query_params.get("page", 1))
# request users in db
users = [
{"userId": i}
for i in range((page - 1) * 50, page * 50)
]
return 200, users
```
## Example
You can look at the [sample](https://github.com/MarwanDebbiche/pylambdarest/tree/master/sample) for a minimal pylambdarest API.
In this sample, we use the [serverless](https://www.serverless.com/) framework to declare the API Gateway -> Lambda routing
The packaging of the Lambda functions is done using the [serverless-python-requirements](https://github.com/UnitedIncome/serverless-python-requirements) plugin.