Flask init

flask_init.py

import logging
import os

from flask import Flask, 
from flask_injector import FlaskInjector
from injector import singleton, Injector, Module
from common_dal import DataAccessLayer, initialize_db_connection
from apis.api_queries import api_before_request


logger = logging.getLogger(__name__)
log_level = os.getenv('LOG_LEVEL', logging.DEBUG)
logger.setLevel(log_level)
logging.basicConfig()


class AppModule(Module):
    def __init__(self, app, env, data_access_layer):
        self.app = app
        self.env = env
        self.dal = data_access_layer

    def configure(self, binder):
        binder.bind(DataAccessLayer, to=self.dal, scope=singleton)


def init_flask():
    flask_app = Flask(__name__, static_url_path='')
    from apis import api
    #api_before_request defined in namespace for our apis
    flask_app.before_request(api_before_request)   
    api.init_app(flask_app, docs='/api-docs')
    logger.debug(flask_app.url_map)
    return flask_app

def create_run_time_flask():
    #use env parameter to retrieve env specific value in our application
    env = os.environ.get("ENV")
    flask_app = init_flask()
    #make the env value accessible globally to all requests
    flask_app.config['ENV'] = env
    data_access_layer = initialize_db_connection(env)
    injector = Injector([AppModule(flask_app, env, dal)])
    FlaskInjector(app=flask_app, injector=injector)
    return flask_app