def create_app(test_config=None):
"""Construct the core application."""
# Create the Flask app object.
app = Flask(__name__)
# Configure the app from configuration-file settings.
app.config.from_object('config.Config')
data_path = os.path.join('covid', 'adapters', 'data')
if test_config is not None:
# Load test configuration, and override any configuration settings.
app.config.from_mapping(test_config)
data_path = app.config['TEST_DATA_PATH']
# Create the MemoryRepository implementation for a memory-based repository.
repo.repo_instance = MemoryRepository()
populate(data_path, repo.repo_instance)
# Build the application - these steps require an application context.
with app.app_context():
# Register blueprints.
from .home import home
app.register_blueprint(home.home_blueprint)
from .news import news
app.register_blueprint(news.news_blueprint)
from .authentication import authentication
app.register_blueprint(authentication.authentication_blueprint)
from .utilities import utilities
app.register_blueprint(utilities.utilities_blueprint)
return app
def create_app(test_config=None):
"""Construct the core application."""
# Create the Flask app object.
app = Flask(__name__)
# Configure the app from configuration-file settings.
app.config.from_object('config.Config')
data_path = os.path.join('covid', 'adapters', 'data')
print(data_path)
#data_path = 'covid\\adapters\\data'
if test_config is not None:
# Load test configuration, and override any configuration settings.
app.config.from_mapping(test_config)
data_path = app.config['TEST_DATA_PATH']
if app.config['REPOSITORY'] == 'memory':
# Create the InMemoryUnitOfWork and MemoryRepository implementations for a memory-based repository.
repo = memory_repository.MemoryRepository()
uow.uow_instance = InMemoryUnitOfWork(repo)
memory_repository.populate(data_path, repo)
elif app.config['REPOSITORY'] == 'database':
# Configure database.
database_uri = app.config['SQLALCHEMY_DATABASE_URI']
if database_uri == 'sqlite://':
# In-memory database.
pool = StaticPool
else:
# File-based database.
pool = NullPool
engine = create_engine(database_uri,
connect_args={"check_same_thread": False},
poolclass=pool)
if app.config['TESTING'] or len(engine.table_names()) == 0:
# For testing, or first-time use of the web application, reinitialise the database.
clear_mappers()
metadata.create_all(
engine) # Conditionally create database tables.
for table in reversed(metadata.sorted_tables
): # Remove any data from the tables.
engine.execute(table.delete())
database_repository.populate(
engine, data_path) # Populate the database with fresh data.
# Create the database session factory and unit of work objects.
session_factory = sessionmaker(autocommit=False,
autoflush=False,
bind=engine)
uow.uow_instance = SqlAlchemyUnitOfWork(session_factory)
# Generate mappings that map domain model classes to the database tables.
map_model_to_tables()
# Build the application - these steps require an application context.
with app.app_context():
# Register blueprints.
from .home import home
app.register_blueprint(home.home_blueprint)
from .news import news
app.register_blueprint(news.news_blueprint)
from .authentication import authentication
app.register_blueprint(authentication.authentication_blueprint)
from .utilities import utilities
app.register_blueprint(utilities.utilities_blueprint)
# Register a tear-down method that will be called after each request has been processed.
@app.teardown_appcontext
def shutdown_session(exception=None):
if isinstance(uow.uow_instance, SqlAlchemyUnitOfWork):
uow.uow_instance.close_current_session()
return app
def in_memory_repo():
repo = MemoryRepository()
memory_repository.populate(TEST_DATA_PATH, repo)
return repo
def create_app(test_config=None):
"""Construct the core application."""
# Create the Flask app object.
app = Flask(__name__)
# Configure the app from configuration-file settings.
app.config.from_object('config.Config')
data_path = os.path.join('covid', 'adapters', 'data')
if test_config is not None:
# Load test configuration, and override any configuration settings.
app.config.from_mapping(test_config)
data_path = app.config['TEST_DATA_PATH']
# Here the "magic" of our repository pattern happens. We can easily switch between in memory data and
# persistent database data storage for our application.
if app.config['REPOSITORY'] == 'memory':
# Create the MemoryRepository instance for a memory-based repository.
repo.repo_instance = memory_repository.MemoryRepository()
memory_repository.populate(data_path, repo.repo_instance)
elif app.config['REPOSITORY'] == 'database':
# Configure database.
database_uri = app.config['SQLALCHEMY_DATABASE_URI']
# We create a comparatively simple SQLite database, which is based on a single file (see .env for URI).
# For example the file database could be located locally and relative to the application in covid-19.db,
# leading to a URI of "sqlite:///covid-19.db".
# Note that create_engine does not establish any actual DB connection directly!
database_echo = app.config['SQLALCHEMY_ECHO']
database_engine = create_engine(
database_uri,
connect_args={"check_same_thread": False},
poolclass=NullPool,
echo=database_echo)
if app.config['TESTING'] == 'True' or len(
database_engine.table_names()) == 0:
print("REPOPULATING DATABASE")
# For testing, or first-time use of the web application, reinitialise the database.
clear_mappers()
metadata.create_all(
database_engine) # Conditionally create database tables.
for table in reversed(metadata.sorted_tables
): # Remove any data from the tables.
database_engine.execute(table.delete())
# Generate mappings that map domain model classes to the database tables.
map_model_to_tables()
database_repository.populate(database_engine, data_path)
else:
# Solely generate mappings that map domain model classes to the database tables.
map_model_to_tables()
# Create the database session factory using sessionmaker (this has to be done once, in a global manner)
session_factory = sessionmaker(autocommit=False,
autoflush=True,
bind=database_engine)
# Create the SQLAlchemy DatabaseRepository instance for an sqlite3-based repository.
repo.repo_instance = database_repository.SqlAlchemyRepository(
session_factory)
# Build the application - these steps require an application context.
with app.app_context():
# Register blueprints.
from .home import home
app.register_blueprint(home.home_blueprint)
from .news import news
app.register_blueprint(news.news_blueprint)
from .authentication import authentication
app.register_blueprint(authentication.authentication_blueprint)
from .utilities import utilities
app.register_blueprint(utilities.utilities_blueprint)
# Register a callback the makes sure that database sessions are associated with http requests
# We reset the session inside the database repository before a new flask request is generated
@app.before_request
def before_flask_http_request_function():
if isinstance(repo.repo_instance,
database_repository.SqlAlchemyRepository):
repo.repo_instance.reset_session()
# Register a tear-down method that will be called after each request has been processed.
@app.teardown_appcontext
def shutdown_session(exception=None):
if isinstance(repo.repo_instance,
database_repository.SqlAlchemyRepository):
repo.repo_instance.close_session()
return app
def in_memory_uow():
repo = MemoryRepository()
memory_repository.populate(TEST_DATA_PATH, repo)
return InMemoryUnitOfWork(repo)