| #!/usr/bin/env python |
| # encoding: utf-8 |
| |
| """This module creates the flask application. |
| """ |
| |
| import os |
| import sys |
| import argparse |
| |
| from flask import Flask |
| from ConfigParser import SafeConfigParser |
| |
| from ec2stack.controllers import * |
| from ec2stack.core import DB |
| from ec2stack.models import User |
| |
| |
| def create_app(settings=None): |
| """ |
| Creates a flask application. |
| |
| @param settings: Settings override object. |
| @return: The flask application. |
| """ |
| app = Flask(__name__) |
| |
| if settings: |
| app.config.from_object(settings) |
| else: |
| args = _generate_args() |
| profile = args.pop('profile') |
| app.config['DEBUG'] = args.pop('debug') |
| config_file = _load_config_file() |
| database_uri = _load_database() |
| _config_from_config_profile(config_file, profile, app) |
| app.config['SQLALCHEMY_DATABASE_URI'] = database_uri |
| |
| DB.init_app(app) |
| |
| default_controller = __import__( |
| 'ec2stack.controllers.' + 'default', None, None, 'DEFAULT' |
| ) |
| default_controller = getattr(default_controller, 'DEFAULT') |
| app.register_blueprint(default_controller) |
| |
| return app |
| |
| |
| def _generate_args(): |
| """ |
| Generate command line arguments for ec2stack-configure. |
| |
| @return: args. |
| """ |
| parser = argparse.ArgumentParser() |
| |
| parser.add_argument( |
| '-p', |
| '--profile', |
| required=False, |
| help='The profile to run ec2stack with, default is initial', |
| default='initial' |
| ) |
| |
| parser.add_argument( |
| '-d', |
| '--debug', |
| required=False, |
| help='Turn debug on for application', |
| default=False |
| ) |
| |
| args = parser.parse_args() |
| |
| return vars(args) |
| |
| |
| def _load_config_file(): |
| """ |
| Checks that the user's configuration file exists and returns its path. |
| |
| @return: The path to the user's configuration file. |
| """ |
| config_file = os.path.join( |
| os.path.expanduser('~'), |
| '.ec2stack/ec2stack.conf' |
| ) |
| |
| if not os.path.exists(config_file): |
| sys.exit('No configuration found, please run ec2stack-configure') |
| |
| return config_file |
| |
| |
| def _config_from_config_profile(config_file, profile, app): |
| """ |
| Configures ec2stack app based on configuration profile. |
| |
| @param config_file: current config file configuration. |
| @param profile: the profile to set the attribute in. |
| """ |
| config = SafeConfigParser() |
| config.read(config_file) |
| |
| if not config.has_section(profile): |
| sys.exit('No profile matching ' + profile |
| + ' found in configuration, please run ec2stack-configure -p ' |
| + profile) |
| |
| for attribute in config.options(profile): |
| app.config[attribute.upper()] = config.get(profile, attribute) |
| |
| instance_type_map = {} |
| instance_section = profile + "instancemap" |
| if config.has_section(instance_section): |
| for attribute in config.options(instance_section): |
| instance_type_map[attribute] = config.get(instance_section, attribute) |
| |
| app.config['INSTANCE_TYPE_MAP'] = instance_type_map |
| |
| resource_type_map = {} |
| resource_section = profile + "resourcemap" |
| if config.has_section(resource_section): |
| for attribute in config.options(resource_section): |
| resource_type_map[attribute] = config.get(resource_section, attribute) |
| |
| app.config['RESOURCE_TYPE_MAP '] = resource_type_map |
| |
| |
| def _load_database(): |
| """ |
| Checks that the user's database exists and returns its uri. |
| |
| @return: The uri to the user's database. |
| """ |
| database_file = os.path.join( |
| os.path.expanduser('~'), |
| '.ec2stack/ec2stack.sqlite' |
| ) |
| |
| if not os.path.exists(database_file): |
| sys.exit('No database found, please run ec2stack-configure') |
| |
| return 'sqlite:///' + database_file |