143 lines
5 KiB
Python
143 lines
5 KiB
Python
# -*- coding: utf-8 -*-
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################################################################################
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#
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# Rattail -- Retail Software Framework
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# Copyright © 2010-2015 Lance Edgar
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#
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# This file is part of Rattail.
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#
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# Rattail is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Affero General Public License as published by the Free
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# Software Foundation, either version 3 of the License, or (at your option)
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# any later version.
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#
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# Rattail is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
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# more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with Rattail. If not, see <http://www.gnu.org/licenses/>.
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#
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################################################################################
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"""
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Application Entry Point
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"""
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from __future__ import unicode_literals
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import os
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import logging
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import edbob
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from edbob.pyramid.forms.formalchemy import TemplateEngine
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import rattail.db
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from rattail.config import RattailConfig
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from rattail.exceptions import ConfigurationError
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from rattail.db.util import get_engines
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from rattail.db.continuum import configure_versioning
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from rattail.db.types import GPCType
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import formalchemy
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from pyramid.config import Configurator
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from pyramid.authentication import SessionAuthenticationPolicy
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import tailbone.db
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from tailbone.auth import TailboneAuthorizationPolicy
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from tailbone.forms import GPCFieldRenderer
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log = logging.getLogger(__name__)
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def make_rattail_config(settings):
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"""
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Make a Rattail config object from the given settings.
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"""
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rattail_config = settings.get('rattail_config')
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if not rattail_config:
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# Initialize rattail config and embed it in the settings dict, to make it
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# available to web requests later.
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path = settings.get('edbob.config')
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if not path or not os.path.exists(path):
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raise ConfigurationError("Please set 'edbob.config' in [app:main] section of config "
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"to the path of your config file. Lame, but necessary.")
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edbob.init('rattail', path)
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log.info("using rattail config file: {0}".format(path))
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rattail_config = RattailConfig(edbob.config)
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settings['rattail_config'] = rattail_config
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rattail_engines = settings.get('rattail_engines')
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if not rattail_engines:
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# Load all Rattail database engines from config, and store in settings
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# dict. This is necessary e.g. in the case of a host server, to have
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# access to its subordinate store servers.
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rattail_engines = get_engines(rattail_config)
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settings['rattail_engines'] = rattail_engines
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# Configure the database session classes. Note that most of the time we'll
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# be using the Tailbone Session, but occasionally (e.g. within batch
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# processing threads) we want the Rattail Session. The reason is that
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# during normal request processing, the Tailbone Session is preferable as
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# it includes Zope Transaction magic. Within an explicitly-spawned thread
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# however, this is *not* desirable.
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rattail.db.Session.configure(bind=rattail_engines['default'])
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tailbone.db.Session.configure(bind=rattail_engines['default'])
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# Configure (or not) Continuum versioning.
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configure_versioning(rattail_config)
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return rattail_config
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def provide_postgresql_settings(settings):
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"""
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Add some PostgreSQL-specific settings to the app config. Specifically,
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this enables retrying transactions a second time, in an attempt to
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gracefully handle database restarts.
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"""
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settings.setdefault('tm.attempts', 2)
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def make_pyramid_config(settings):
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"""
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Make a Pyramid config object from the given settings.
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"""
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config = Configurator(settings=settings)
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# Configure user authentication / authorization.
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config.set_authentication_policy(SessionAuthenticationPolicy())
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config.set_authorization_policy(TailboneAuthorizationPolicy())
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# Bring in some Pyramid goodies.
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config.include('pyramid_beaker')
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config.include('pyramid_mako')
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config.include('pyramid_tm')
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# Configure FormAlchemy.
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formalchemy.config.engine = TemplateEngine()
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formalchemy.FieldSet.default_renderers[GPCType] = GPCFieldRenderer
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return config
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def configure_postgresql(pyramid_config):
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"""
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Add some PostgreSQL-specific tweaks to the final app config. Specifically,
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adds the tween necessary for graceful handling of database restarts.
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"""
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pyramid_config.add_tween('edbob.pyramid.tweens.sqlerror_tween_factory',
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under='pyramid_tm.tm_tween_factory')
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def main(global_config, **settings):
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"""
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This function returns a Pyramid WSGI application.
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"""
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rattail_config = make_rattail_config(settings)
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pyramid_config = make_pyramid_config(settings)
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return pyramid_config.make_wsgi_app()
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