Put your functions to REST
Project description
Tranquilizer
Deploy a REST API with one line by decorating your functions.
Install
The package is available for all Mac, Linux, and Windows on my conda channel. Python 2 is not supported.
> conda install -c conda-forge tranquilizer
Quick start
Tranquilizer can be used with either Jupyter Notebooks (.ipynb
) or Python script files (.py
).
The decorated function below will be served as an end point called order
with the GET method. The
function must return a JSON serializable object.
See the complete description of @tranquilize()
below.
from tranquilizer import tranquilize
@tranquilize()
def order(cheese):
'''I'd like to buy some cheese!'''
return "I'm afraid we're fresh out of {}, Sir.".format(cheese)
The REST API is served by Flask and Flask-RESTX
using the tranquilizer
command.
> tranquilizer cheese_shop.ipynb
* Serving Flask app "tranquilizer.application" (lazy loading)
* Environment: production
WARNING: Do not use the development server in a production environment.
Use a production WSGI server instead.
* Debug mode: off
* Running on http://0.0.0.0:8086/ (Press CTRL+C to quit)
Let's see if there is any Red Leicester.
> curl -G http://localhost:8086/order --data-urlencode "cheese=Red Leicester"
"I'm afraid we're fresh out of Red Leicester, Sir."
or using the Requests library in Python.
In [1]: import requests
In [2]: response = requests.get('http://localhost:8086/order', params={'cheese':'Red Leicester'})
In [3]: response.text
Out[3]: '"I\'m afraid we\'re fresh out of cheddar, Sir."\n'
The tranquilized API is documented with Swagger and is accessible in your web browser at http://localhost:8086.
Tranquilize Decorator
The @tranqulize
decorator will assign the GET method by default. POST is also supported with method='post'
.
Other methods are under consideration.
By default a tranquilized function will receive all inputs as strings. This behavior can be modified by using type hints. When data is received by the Flask server it will use the provided type function to transform the string to the requested data type. This avoids having to perform the conversion in your tranquilized function.
Supported source formats
Tranquilizer can serve functions written in Python source (.py
) files or Jupyter Notebooks (.ipynb
).
When working interactively in Jupyter Notebooks the decorated functions will continue to operate as normal.
Note that all calls to Jupyter Magic
and Shell (!
) commands will be ignored when the REST API is served.
Only those lines will be ignored, the rest of the cell will continue to run.
Data Types
In addition to builtin types Tranquilizer provides specialized support for Lists, date/datetime, and files.
Type | Description |
---|---|
datetime.date or datetime.datetime |
Converts string with dateutil.parser.parse and returns specified type. |
list |
Converts repeated arguments to a list of strings. |
typing.List[<type>] |
Converts repeated arguments to a list; each value is converted to <type> . |
List
arguments are constructed using the action='append'
argument described in
the Flask RESTX documentation.
Any valid type can be used in List[]
.
The following file-like types are handled by werkzeug FileStorage
.
FileStorage
is a file-like object that supports methods like .read()
and .readlines()
.
These types support sending files with cURL using -F
.
Type | Description |
---|---|
typing.BinaryIO |
File-like object to read binary data. |
typing.TextIO |
Converts FileStorage type to io.StringIO() . |
Further, specific support for Image and NumPy files are provided. The binary contents of the file are automatically converted.
Type | Description |
---|---|
PIL.Image.Image |
Converts FileStorage type to PIL Image. |
numpy.ndarray |
Converts FileStorage type to NumPy array using np.load() . |
Custom types
Custom type classes can be built...
Type hints example
The example below uses int
, datetime.datetime
, and typing.List
. datetime.datetime
support
has been built with datetutil
and will convert any compatible datetime string to a datetime.datetime
object. typing.List
supports specialization with []
and will transform all repeated arguments passed to the REST API into a list and convert
the type of each element.
Finally, tranquilizer supports default arguments.
from tranquilizer import tranquilize
from datetime import date
from typing import List
@tranquilize(method='post')
def convert(string: str, date: date, items: List[float], factor: int = 10):
'''Let's convert strings to something useful'''
new_items = [i * factor for i in items]
response = {
'string': string.upper(),
'date' : date.strftime('%c'),
'items' : new_items
}
return response
Let's see what happens when I POST to this REST API.
In [1]: data = {'string':'hello, world!', 'date':'4th July 1776', 'items':range(5)}
In [2]: import requests
In [3]: response = requests.post('http://localhost:8086/convert', data=data)
In [4]: response.json()
Out[4]:
{'date': 'Thu Jul 4 00:00:00 1776',
'items': [0.0, 10.0, 20.0, 30.0, 40.0],
'string': 'HELLO, WORLD!'}
In [5]:
Securing the API with a bearer token
If you need to secure your tranquilized API with an Authorization Bearer token use the --secret-key
command-line
flag. The supplied secret key is used to decrypt JWT tokens. When the tranquilizer server starts a bearer token
is printed to standard out that can be used to access the API. Here's an example of the output.
NOTE: It is important that you keep your secret key safe and not share it as it is used to sign and verify bearer tokens, not to access the API.
> tranquilizer --secret-key <secret-key> cheese_shop.ipynb
-- This API secured with JWT using the HS256 algorithm. The following token can be used as an Authorization Bearer token in the request header.
eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJmcmVzaCI6ZmFsc2UsImlhdCI6MTYzODc0MzkxNiwianRpIjoiNGY0YTdiZWYtMWJiZi00ZGUwLWI0MDMtOTVhNzY2Y2IxNWUyIiwidHlwZSI6ImFjY2VzcyIsInN1YiI6IlRyYW5xdWlsaXplZCBBUEkgdXNlciIsIm5iZiI6MTYzODc0MzkxNn0.pWoKvH_N9abFUYLzbzc02ewnPGPbvTjiFAVI3GlVltw
-- You can create more bearer tokens online at https://jwt.io using the secret-key you supplied on the command line.
* Serving Flask app "tranquilizer.application" (lazy loading)
* Environment: production
WARNING: This is a development server. Do not use it in a production deployment.
Use a production WSGI server instead.
* Debug mode: off
* Running on http://0.0.0.0:8086/ (Press CTRL+C to quit)
A user can then utilize the supplied token in requests to the API, for example with curl
> TOKEN='eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJmcmVzaCI6ZmFsc2UsImlhdCI6MTYzODc0MzkxNiwianRpIjoiNGY0YTdiZWYtMWJiZi00ZGUwLWI0MDMtOTVhNzY2Y2IxNWUyIiwidHlwZSI6ImFjY2VzcyIsInN1YiI6IlRyYW5xdWlsaXplZCBBUEkgdXNlciIsIm5iZiI6MTYzODc0MzkxNn0.pWoKvH_N9abFUYLzbzc02ewnPGPbvTjiFAVI3GlVltw'
> curl -H 'Authorization: Bearer ${TOKEN}' http://localhost:8086/order?cheese=cheddar
"I'm afraid we're fresh out of cheddar, Sir."
If the authorization header is not included in the request a 401 error is returned.
> curl -i http://localhost:8086/order?cheese=cheddar
HTTP/1.0 401 UNAUTHORIZED
Content-Type: application/json
Content-Length: 43
Server: Werkzeug/1.0.1 Python/3.7.9
Date: Mon, 06 Dec 2021 15:46:19 GMT
{"message":"Missing Authorization Header"}
Choosing functions to protect with authentication
By default all @tranquilize()
decorated functions will require authentication when using the --secret-key
command
line argument. To disable authentication for specific functions use the requires_authentication=False
keyword
argument. For example in the tranquilized functions below the cheeses()
function does not require the
Authorization: Bearer ${TOKEN}
header, but the order()
function does require the header.
When requires_authentication=None
or is not included in the decorator call the function will require authentication
when using the --secret-key
CLI argument. If requires_authentication=True
is used but tranquilizer is not started
with the --secret-key
argument a RuntimeError
exception is raised.
from tranquilizer import tranquilize
@tranquilize()
def cheeses(method='get', requires_authentication=False):
'''List the available cheeses'''
return ['Red Leicester', 'Tilsit', 'Caerphilly', 'Bel Paese', 'Venezuelan Beaver Cheese']
@tranquilize(method='post')
def order(cheese):
'''I'd like to buy some cheese!'''
return "I'm afraid we're fresh out of {}, Sir.".format(cheese)
Swagger
When using --set-secret
and the optional requires_authentication
keyword argument the Swagger docs
are still accessible but in order to try out an endpoint that requires authentication you must first
click the Authorize
button at the top right. In the dialog box include the bearer token prepended by Bearer
as shown in the screenshot.
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