def setUp(self):
"""Initialize an app and install :class:`.Base`."""
"""Disable logging to avoid messy output during testing"""
import logging
wlog = logging.getLogger('werkzeug')
wlog.disabled = True
self.app = create_web_app()
self.client = self.app.test_client()
def application(environ, start_response):
"""WSGI application, called once for each HTTP request.
application() will be called once for each HTTP request. WSGI has
no initialization lifecycle phase. This code will only get run
with a HTTP request in the environ.
The Flask app should be reused across requests. Creating the
Flask app for each request showed up as a problem in 2019 where
SQLAlchemy connection pooling seemed to be disabled because a new
SQLAlchemy DB was created for each requsest.
Apache httpd passes config from SetEnv directives via the request
environ. We currently have a use case of running apache HTTPD
with mod_wsgi and setting environment variables for Flask apps
with apache's SetEnv directive. SetEnv does not seem to set an OS
environment variable that is perserved in the WSGI deamon
process. SetEnv values are passed to WSGI application() in the
environ agrument.
This will not be needed once each app is on docker+nginx.
"""
# Copy string WSGI envrion to os.environ. This is to get apache
# SetEnv vars. It needs to be done before the call to
# create_web_app() due to how config is setup from os in
# browse/config.py.
for key, value in environ.items():
if type(value) is str:
os.environ[key] = value
# 'global' actually means module scope, and that is exactly what
# we want here.
#
# Python docs are thin. I'm seeing this sort of thing on
# stackoverflow: "In Python there is no such thing as absolute
# globals automatically defined across all namespaces
# (thankfully). As you correctly pointed out, a global is bound to
# a namespace within a module..."
global __flask_app__
if __flask_app__ is None:
__flask_app__ = create_web_app()
return __flask_app__(environ, start_response)
"""An instance of the browse web app.""" from browse.factory import create_web_app app = create_web_app()
def application(environ, start_response):
"""WSGI application factory."""
for key, value in environ.items():
os.environ[key] = str(value)
app = create_web_app()
return app(environ, start_response)