Joyful Python Web App development with Appier

Presentation on the Appier Framework from Hive Solution for the Python Porto Community. It provides a simple introduction to the framework's core features and use-cases.

Transcript

1. Joyful Python Web App development with Appier João Magalhães
2. A bit of history • Born out of Hive Solutions’ necessity • Built in 2013 out of Flask Quorum set of Flask extensions • Simple design influenced by Flask • “Some batteries included” philosophy
3. “Some batteries included” • Django, batteries included (too bloated) • Flask (minimalist, some major things are missing) • Appier in between both
4. Design decisions • Object oriented in nature • Data model layer out of the box • Built for easy REST API building • Extensible by design • Scalable and performant • Asynchronous (coroutines and futures)
5. Code... class HelloApp(appier.App): @appier.route("/", "GET") def hello(self): return "Hello World" HelloApp().serve()
6. … and JSON class HelloApp(appier.App): @appier.route("/", "GET", json=True) def hello_json(self): return {"Hello" : "world"} HelloApp().serve()
7. Async support design • Scalable (solves the C10K problem) • Compatible (supports both Python 2.6+ and 3.3+) • Simple (code looks as similar as possible to “normal” blocking Appier code) • Uses (semi-)coroutines together with futures • Works great with the asyncio module (from standard lib)
8. What’s asynchronous on Appier • Async from top to bottom & out-of-the box • Lots of challenges implementing it • Template rendering • Data layer • Filesystem IO, HTTP clients, etc.
9. Not Async example class NotAsyncHTTPApp(appier.App): @appier.route("/", "GET") def example(self): return appier.get("https://appier.hive.pt/") NotAsyncHTTPApp().serve()
10. Async example class AsyncHTTPApp(appier.App): @appier.route("/", "GET") async def example(self): return await appier.get_w("https://appier.hive.pt/") AsyncHTTPApp().serve()
11. Another async example class AsyncHTTPApp(appier.App): @appier.route("/", "GET") async def example(self): url = "https://appier.hive.pt/” await asyncio.sleep(3) response = await aiohttp.request("GET", url) return await response.read() AsyncHTTPApp().serve()
12. Async data layer class AsyncModelsApp(appier.App): @appier.route("/", "GET") async def example(self): person = models.Person(name="Tobias") await person.save() print(person.id) person = await models.Person.get(name="Tobias") return person.map() HelloApp().serve()
13. Templates • Modular template support • Jinja2 is first class citizen • Async rendering support for Jinja2 out-of-the-box
14. Models • Simple model design approach • Multiple back-end support • Validations, pre_*, post_* and on_* hooks • Custom type support (implement loads() and dumps()) • Async support (still under construction)
15. Models - Example class Person(appier.Model): identifier = appier.field( type = int, index = True, increment = True ) name = appier.field() age = appier.field( type = int )
16. Models - Custom Types class Person(appier.Model): thumbnail = appier.field( type = appier.image( width = 400, height = 400, format = "png" ) )
17. Models - Custom Types class DateTime(appier.Type): def loads(self, value): self._datetime = datetime.datetime.utcfromtimestamp(value) def dumps(self): return self.timestamp() def timestamp(self): return time.mktime(self._datetime.timetuple())
18. • Admin interface • Access control • Auto-snapshotting of models • Encrypted model fields • App configuration (JSON, env variables, DB, other) Other cool features
19. Who uses it ?
20. • nicholaskirkwood.com • budy.hive.pt • rocklobby.com • oioba.com • webook.pt • dev.windows.com • karl.com • my-swear.com • hive.pt • lugardajoia.com Who uses it ?
21. What’s joy ? noun - a feeling of happiness • Having a minimal set of dependencies • Owning the code by understanding it • Having code that scales properly • Using simple tools to build complex things
22. Q & A Best question gets a free PyCharm subscription