a python a web service - files.meetup.comfiles.meetup.com/8579852/pytim #4 vlad temian - a python...

A Python a web service

A Python a web service@vtemian


Let’s imaginea perfect world...


WEB APPLICATION

A Python a web serviceWEB APPLICATION

Tools & Utilities


Tools & Utilities Web Process


Tools & Utilities Web Process Worker Process

WEB APPLICATION


Tools & Utilities

management tools

supporting services

Web Process Worker Process

WEB APPLICATION


Tools & Utilities

management tools

supporting services

Web Process

user interface

api service

data persistence

auth

crud admin

Worker Process

WEB APPLICATION


Tools & Utilities

management tools

supporting services

Web Process

user interface

api service

data persistence

auth

crud admin

Worker Process

deferred tasks

scheduled tasks

WEB APPLICATION


Single codebase areEVIL!


Tools & Utilities

management tools

supporting services

Web Process

user interface

api service

data persistence

auth

crud admin

Worker Process

deferred tasks

scheduled tasksTOTAL MESS


Decouple!


Developers

API service

Data persistence

Frontend

End Users


Developers End Users Internal

API service API service API service

Data persistence


Good API


Good APIIntuitive

similar things should be similar, ugly things should look ugly

Documented

Opinionated


Featurespagination

propper HTTPresponse handling throttling

permissions serializationauthentification

posting of data with validation


Django

regex routing system


Django

regex routing system built-in orm


users = Users.objects.filter(last_login__lt=timestamp)

Django



authmigrations

management tools makes decision for you

templating system

built-in orm crud admin

testing tools

Django

A Python a web service NOBODY CARES


Developers End Users Internal

API service API service API service

Data persistence

Django



makes decision for you

templating system

testing tools

Django


Django REST Framework


Just install it, write 20 lines of code> CRUD API


API Console


Great community


Easy to document your API


Integration test usingAPIRequestFactory


OAuth 1 & 2 out of the box


Serialization


Django paginatoror PaginationSerializer


Object or field level validation


Using django caching policy


For throttling, just add: DEFAULT_THROTTLE_CLASSES +

DEFAULT_THROTTLE_RATESin settings.py


Powerful and extensible object level permissions


Depends on Django >get all the Django mess


Pretty huge


Can do a lot of black magic


Rigid


Django Tastypie


Plug and play


Decent auth support


Documented


Still supported


Paginator for pagination


Validation --- you can extend it


serializer = Serializer(formats=[‘json’, ‘jsonp’, ‘xml’, ‘yaml’, ‘html’, ‘plist’])


throttle = BaseThrottle(throttle_at=100)


NO NO NO


Not intuitive


Ugly


class ParentResource(ModelResource): children = fields.ToManyField(ChildResource, ‘children’)

def prepend_urls(self): return [ url(r”^(?P<resource_name>%s)/(?P<pk>\w[\w/-]*)/children%s$” % (self._meta.resource_name, trailing_slash()), self.wrap_view(‘get_children’), name=”api_get_children”), ] def get_children(self, request, **kwargs): try: bundle = self.build_bundle(data={‘pk’: kwargs[‘pk’]}, request=request) obj = self.cached_obj_get(bundle=bundle, **self.remove_api_resource_names(kwargs)) except ObjectDoesNotExist: return HttpGone() except MultipleObjectsReturned: return HttpMultipleChoices(“More than one resource is found at this URI.”)

child_resource = ChildResource() return child_resource.get_detail(request, parent_id=obj.pk)


Depends on Django >get all the Django mess


Rigid


Flask


from flask import Flaskapp = Flask(__name__)

@app.route(“/”)def hello(): return “Hello World!”

if __name__ == “__main__”: app.run()


Werkzeug, Jinja 2 and good intentions


Very small and easy to learn(super intuitive)


Solid and well documented


Awesome and strong community


Great debugging tools


Application dispatcher (on wsgi level)


Integrating unittest and integration tests (also check flask-testing)


Signals


Configuration == dict


Blueprints


Response object == wsgi app


SHOW ME THE SOURCEYOU MUST


BYOB


Some batteries

Flask-SQLAlchemy Flask-Testing

Flask-Oauthlib

Flask-Script

Flask-PrincipalFlask-Cache

Flask-Classy


Q/A


Resources

Kenneth ReitzFlask GoodnessAPI Driven DevelopmentHow I develop Things and Why?

Kevin LackerHow to Design Great APIs?


Thank you!

DRINK ALL THE BEERS!

a python a web service - files.meetup.comfiles.meetup.com/8579852/pytim #4 vlad temian - a python...

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