def load_paste_app(app_name=None):
"""Builds and returns a WSGI app from a paste config file.
We assume the last config file specified in the supplied ConfigOpts
object is the paste config file.
:param app_name: name of the application to load
:raises RuntimeError when config file cannot be located or application
cannot be loaded from config file
"""
if app_name is None:
app_name = cfg.CONF.prog
conf_file = _get_deployment_config_file()
if conf_file is None:
raise RuntimeError(_("Unable to locate config file [%s]") %
cfg.CONF.paste_deploy['api_paste_config'])
try:
app = wsgi.paste_deploy_app(conf_file, app_name, cfg.CONF)
# Log the options used when starting if we're in debug mode...
if cfg.CONF.debug:
cfg.CONF.log_opt_values(logging.getLogger(app_name),
sys_logging.DEBUG)
return app
except (LookupError, ImportError) as e:
raise RuntimeError(_("Unable to load %(app_name)s from "
"configuration file %(conf_file)s."
"\nGot: %(e)r") % {'app_name': app_name,
'conf_file': conf_file,
'e': e})
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