[Twisted-web] deployment with twistd of simple web application

[Axel Rau]

Am 05.11.2013 um 13:25 schrieb Laufens Van Houtven <_ at lvh.io>:

> You probably want to read this:
> 
> https://twistedmatrix.com/documents/current/core/howto/application.html
> 
> There's a number of ways you can use twistd web, for example with a tac file, but personally I always opt for using a Twisted plugin, so you instead do twistd mything :)


I try to write the plugin now:
…
from zope.interface import implements

from twisted.application.service import IServiceMaker
from twisted.application import internet
from twisted.plugin import IPlugin
from twisted.python import usage

from meteo import meteoFactory

class Options(usage.Options):
	optParameters = [	['port', 'p', 80, 'The port number to listen on.'],
						['ipv4_address', '4', None, 'The IPv4 address to listen on.'],
						['ipv6_address', '6', None, 'The IPv6 address to listen on.']]

class MeteoServiceMaker(object):
	implements(IServiceMaker, IPlugin)
	tapname = 'meteo'
	description = 'A web application for the meteo package'
	options = Options
	
	def makeService(self, options):
		"""
		Constructs a TCP server from a factory defined in meteo.py
		"""
		return internet.TCPServer(	int(options['port'], 
									interface=options['ipv4_address'],	## how do it set the ip6 address?
									meteoFactory())				

serviceMaker = MeteoServiceMaker()
---
--- relevant part of metro.py:	
resource = RootWeatherPage()
meteoFactory = Site(resource)
--- 
Currently, this gives following error:
---
[meteo] [www4:py-venv/meteo/meteo] root# twistd --help
Unhandled Error
Traceback (most recent call last):
  File "/usr/local/py-venv/meteo/lib/python2.7/site-packages/twisted/python/usage.py", line 450, in __str__
    return self.getSynopsis() + '\n' + self.getUsage(width=None)
  File "/usr/local/py-venv/meteo/lib/python2.7/site-packages/twisted/python/usage.py", line 486, in getUsage
    for (cmd, short, parser, desc) in self.subCommands:
  File "/usr/local/py-venv/meteo/lib/python2.7/site-packages/twisted/application/app.py", line 631, in subCommands
    for plug in sorted(plugins, key=attrgetter('tapname')):
  File "/usr/local/py-venv/meteo/lib/python2.7/site-packages/twisted/plugin.py", line 209, in getPlugins
    allDropins = getCache(package)
--- <exception caught here> ---
  File "/usr/local/py-venv/meteo/lib/python2.7/site-packages/twisted/plugin.py", line 167, in getCache
    provider = pluginModule.load()
  File "/usr/local/py-venv/meteo/lib/python2.7/site-packages/twisted/python/modules.py", line 383, in load
    return self.pathEntry.pythonPath.moduleLoader(self.name)
  File "/usr/local/py-venv/meteo/lib/python2.7/site-packages/twisted/python/_reflectpy3.py", line 266, in namedAny
    topLevelPackage = _importAndCheckStack(trialname)
  File "/usr/local/py-venv/meteo/lib/python2.7/site-packages/twisted/python/_reflectpy3.py", line 205, in _importAndCheckStack
    return __import__(importName)
exceptions.SyntaxError: invalid syntax (meteo_plugin.py, line 29)
---
Line 29 is
	serviceMaker = MeteoServiceMaker()
What is wrong there?

Thanks,
Axel
---
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