cow is a web framework in the sense that it allows users to create tornado applications with configuration, templates and static files very easily without being a different beast.
cow automates most of the boring parts of tornado, allowing users to write only the part that actually matters: the handlers.
Installing cow is as easy as:
pip install cow-framework
Just create a server.py file that looks like this:
from cow.server import Server
from cow.plugins.motorengine_plugin import MotorEnginePlugin
def main():
AppServer.run()
class AppServer(Server):
def get_handlers(self):
return (
# Add your handlers here
# ('/', TestHandler),
)
def get_plugins(self):
# add whatever plug-ins you want to use here
return [
MotorEnginePlugin,
]
if __name__ == '__main__':
AppServer.run()
To run your app, just use python server.py, or add the main method to your setup.py file as a command.
If you open server.py, you'll see that it has a method called get_handlers that should return a list of handlers that will be passed to tornado. This is where you can put your own handlers.
Suppose we have a HelloWorldHandler that writes Hello World to our users, like the following:
from tornado.web import RequestHandler
class HelloWorldHandler(RequestHandler):
def get(self):
self.write("Hello World!")
Then in our server.py Server class, we need to add it to a route, like this:
from cow.server import Server as CowServer
from myproject.handlers.hello_world import HelloWorldHandler
class Server(CowServer):
def get_handlers(self):
return (
('/', HelloWorldHandler),
)
Now if you run server.py and access http://localhost:4444/ you should see the string Hello World.
It's really simple. You can use cow's CowTestCase, like this:
from cow.testing import CowTestCase
from myproject.server import Server # the same server as in the above code
class TestHelloWorld(CowTestCase):
def get_config(self):
return {} # add whatever configuration your app requires
def get_server(self):
cfg = Config(**self.get_config())
return Server(cfg)
def test_hello_world(self):
response = self.fetch('/')
assert response.code == 200
assert response.body == 'Hello World'
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