Pyramid Lighter/Faster/Better web apps

Lighter/faster/better web apps Dylan Jay CTO PretaWeb.com SyPy.org twitter: djay75

From the mind of Chris McDonough As seen in bearded of PyCon 2009 http://www.flickr.com/photos/termie/3392894269/

Pyramid Family Tree Zope formally Principia (1996-) Zope2 (1998-) BlueBream formally Zope3 (2004-) ZTK (2009-) Repoze.bfg (2008 – 2010) Pylons (2005-2010) Pylons Project (2010-) Pyramid formally repoze.bfg ( Dec 2010 -) TurboGears (2005-) RoR (2004-) Django (2005-)

Who uses it
It's still new
Karl Project
Aeterna Water – paperless sales system
“How to build complex web applications having fun”
http://slidesha.re/mH9Lxa
1000 employees
No ORM = easy integrate with Plone
Less Magic. More simple

From the minds on PretaWeb... PloneFactory Web installer for the worlds favourite Python CMS Coming 2011...

Differences...
Non opinionated framework
Component Architecture
Packages (eggs)
Simpler and faster
Pyramid Django Plone Not Opinionated Opinionated Structured (CMS) Very Simple Simple Complex No DB ORM Content Types Little Reuse Some Reuse Easy Reuse

Performance http://blog.curiasolutions.com/the-great-web-framework-shootout/

Performance http://plope.com/pyroptimization

Install $ virtualenv -- no-site-packages -- distribute newproject $ cd newproject $ bin/pip install pyramid

Hello World from paste.httpserver import serve from pyramid.configuration import Configurator from pyramid.response import Response def hello_world(context, request): return Response('Hello world!') if __name__ == '__main__': config = Configurator() config.begin() config.add_view(hello_world) config.end() app = config.make_wsgi_app() serve(app, host='0.0.0.0')

config.add_route('myroute', '/prefix/{one}/{two}') config.add_view(hello_world, route_name='myroute') foo/{baz}/{bar}*fizzle foo/{baz}/{bar}{fizzle:.*}
Also custom predicates
Routes (URL Dispatch)

View Callables from pyramid.response import Response def hello_world(request): return Response('Hello world!') from pyramid.httpexceptions import HTTPFound class MyView(object): def __init__(self, request): self.request = request def __call__(self): raise HTTPFound(location='http://example.com')

Request / prefix/foo/bar?pref=red&pref=blue; def hello_world(request): assert 'blue' == request.params['pref'] assert ['red,'blue] == request.params.getall('pref') assert ['foo','bar'] == request.matchdict.values() return Response('Hello world!')

Renderers from pyramid.view import view_config @view_config(renderer='json') def hello_world(request): return {'content':'Hello!'} @view_config(renderer='string') def hello_world(request): return {'content':'Hello!'} @ view_config(renderer='mypackage:templates/foo.mak') Add your own - config.add_renderer('.jinja2', 'mypackage.MyJinja2Renderer')

Templates from pyramid.renderers import render_to_response def sample_view(request): return render_to_response('templates/foo.pt', {' foo':1, 'bar':2}, request=request)

BYO Templating from mako.template import Template from pyramid.response import Response def make_view(request): template = Template(filename='/templates/template.mak') result = template.render(name=request.params['name']) response = Response(result) return response

Chameleon ZPT Templates
Compiled to python – really fast
XHTML complaint
.pt files
<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" " http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> < html xmlns="http://www.w3.org/1999/xhtml" xmlns:tal="http://xml.zope.org/namespaces/tal"> < head> < meta http-equiv="content-type" content="text/html; charset=utf-8" /> < title>${project} Application</title> </ head> < body> < h1 class="title">Welcome to <code>${project}</code>, an application generated by the <a Href=”http://..." tal:attributes=”href mylink” > pyramid</a> web application framework.</h1> < ul > <li tal:repeat=”row rows”>${row}</li></ul> </ body> </ html>

Static Assets config.add_static_view(name='static', path='/var/www/static') / static/main.css -> /var/www/static/main.css config.add_static_view(name='static', path='some_package:a/b/c/static') / static/foo.jpg -> ./src/some_package/a/b/c/static/foo.jpg

Traversal

Traversal (Resource Location) Pattern allowing transitive and indirect view loockup Simplifies view code for complex apps Great for content centric URLS config.add_view(photo_edit, context=Photo, name='edit') Class User(dict): pass Class Folder(dict): pass Class Photo(dict): pass def photo_edit(request): Return Response('editing %s', request.context.Ttile)

Inside Traversal / joeschmoe/photos/photo1/edit psuedo code: context = get_root()['joeschmoe']['photos']['photo1'] view_callable = get_view(context,'edit') request.context = context view_callable(request)

View Predicates
name
context (class or interface)
route_name
request_type (interface)
request_method (e.g POST)
header
request_param (key in request.params)
containment (class or interface)
xhr
accept (mimetypes)
path_info (regex)
custom_predicates

Security - Protecting Authentication Policy – Extract principals from request Authorization Policy – Access based on Context, Principals and View's permissions config.add_view(myview, name='add_entry.html', context='mypackage.resources.Blog', permission='add')

Security Configuration def auth(userid, request): return ['user:bob','group:editors'] if userid == 'bob' else None from pyramid.config import Configurator from pyramid.authentication import AuthTktAuthenticationPolicy from pyramid.authorization import ACLAuthorizationPolicy authentication_policy = AuthTktAuthenticationPolicy('seekrit', callback=auth) authorization_policy = ACLAuthorizationPolicy() config = Configurator(authentication_policy=authentication_policy, authorization_policy=authorization_policy)

Security - Context from pyramid.security import Everyone from pyramid.security import Allow class Blog(object): pass blog = Blog() blog.__acl__ = [ (Allow, Everyone, 'view'), (Allow, 'group:editors', 'add'), (Allow, 'group:editors', 'edit'), ]

Customising
Designed Extensible
Not “apps” like django
Plugpoints
Views
Routes
Assets

Customizing Example def configure_views(config): config.add_view('orig_app.views.theview', name='theview') from pyramid.config import Configurator from orig_app import configure_views if __name == '__main__': config = Configurator() config.include(configure_views) config.add_view('override_app.views.theview', name='theview')

pyramid_socketio config.add_route('socket_io', 'socket.io/*remaining') config.add_view(socketio_service, route_name='socket_io') from pyramid.response import Response from pyramid_socketio.io import SocketIOContext, socketio_manage class ConnectIOContext(SocketIOContext): # self.io is the Socket.IO socket # self.request is the request def msg_connect(self, msg): print "Connect message received", msg self.msg("connected", hello="world") def socketio_service(request): return Response( socketio_manage(ConnectIOContext(request)) )

But wait, there's more!
Events
i18n
Sessions
Hooks
ZCML
Includes
ZODB and SQLAlchemy

Https://convore.com/pylons
Http://docs.pylonsproject.org/docs/pyramid.html
Https://github.com/Pylons
Http://pylonsproject.org
Dylan Jay
http://www.pretaweb.com

http://lanyrd.com	64
http://paper.li	4
http://twitter.com	2
http://krutubtim.wordpress.com	2
http://a0.twimg.com	1
http://www.twylah.com	1
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Pyramid Lighter/Faster/Better web apps

by Dylan Jay on Aug 20, 2011

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