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"""Checks to do before the application is started."""
from typing import Tuple
from flask import Blueprint, current_app, render_template
class StartupError(Exception):
"""Base class for Application Check Errors."""
class MissingConfigurationError(StartupError):
"""Raised in case of a missing required setting."""
def __init__(self, missing=Tuple[str, ...]):
"""Initialise the MissingConfigurationError object."""
super().__init__("At least one required configuration is missing.")
self.missing = missing
startup_errors = Blueprint("app_check_errors", __name__)
__MANDATORY_CONFIGURATIONS__ = (
"REDIS_URL", # URI to Redis server
"SQL_URI", # URI to MariaDB server
"GN_SERVER_URL", # REST API Server
"AUTH_SERVER_URL" # Auth(entic/oris)ation Server
)
def check_mandatory_configs(app):
"""Check that all mandatory configuration settings are defined."""
missing = tuple(
setting for setting in __MANDATORY_CONFIGURATIONS__
if (setting not in app.config
or app.config.get(setting) is None
or app.config.get(setting).strip() == ""))
if len(missing) > 0:
print(missing)
raise MissingConfigurationError(missing)
@startup_errors.route("/")
def error_index():
"""Display errors experienced at application startup"""
return render_template(
"startup_errors.html",
error_type = type(current_app.startup_error).__name__,
error_value = current_app.startup_error)
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