CODEWITHSUNDEEP
pythontwistedpyramid
Lars
Lars

Reputation: 1072

Serving Pyramid application using twistd

I have a Pyramid app that also has some Twisted code in it, and so I would like to serve the app using twistd to kill two birds with one stone.

Here is my .tac file:

from twisted.web.server import Site
from twisted.web.wsgi import WSGIResource
from twisted.internet import reactor
from twisted.application import internet, service
import os

from pyramid.paster import get_app, setup_logging

config='/path/to/app/production.ini'
config = os.path.abspath(config)
port = 8888

application = get_app(config, 'main')

# Twisted WSGI server setup...
resource = WSGIResource(reactor, reactor.getThreadPool(), application)
factory = Site(resource)

service = internet.TCPServer(port, factory)

service.setServiceParent(application)

To run this I used:

twistd -y myApp.tac

I am getting errors telling me that the get_app() method does not return an object that can be used in this way. E.g.:

"Failed to load application: 'PrefixMiddleware' object has no attribute 'addService'"

What is the best way to run a Pyramid app using twistd?

Upvotes: 2

Views: 973

Answers (2)

Jean-Paul Calderone
Jean-Paul Calderone

Reputation: 48335

You can use the WSGI support in Twisted Web's twistd plugin to shorten this and make it more easily configurable. Create a module like this:

from pyramid.paster import get_app

config = '/path/to/app/production.ini'
myApp = get_app(config, 'main')

Then run twistd like this:

$ twistd web --port tcp:8888 --wsgi foo.myApp

Where foo is the name of the module you create.

Upvotes: 3

Lars
Lars

Reputation: 1072

I found a working solution. Here is the working .tac file:

from twisted.web.server import Site
from twisted.web.wsgi import WSGIResource
from twisted.internet import reactor
from twisted.application import internet, service
import os

from pyramid.paster import get_app, setup_logging

config='/path/to/app/production.ini'
config = os.path.abspath(config)
port = 8888

# Get the WSGI application
myApp = get_app(config, 'main')

# Twisted WSGI server setup
resource = WSGIResource(reactor, reactor.getThreadPool(), myApp)
factory = Site(resource)

# Twisted Application setup
application = service.Application('mywebapp')
internet.TCPServer(port, factory).setServiceParent(application)

get_app() gets the Pyramid WSGI application, while internet.TCPServer needs a Twisted Application object, so these should not be confused.

This code will start the app on TCP port 8888.

If someone has a better/clearer way to implement this, please add your answer.

Upvotes: 2

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