Middleware for integrating Falcon applications with SQLAlchemy.
Falcon Middleware: SQLAlchemy Integration
The falcon-sqla package provides a middleware component for managing SQLAlchemy sessions. The manager component can also serve as a base building block or a recipe for more complex use cases, such as applications leveraging multiple database binds.
$ pip install falcon-sqla
The falcon_sqla session Manager can be used in two ways:
- As a Falcon middleware component.
- As a context manager to explicitly provide a database session.
- Create a SQLAlchemy engine.
- Pass the engine to the Manager() initializer as its first parameter.
- If using the manager as a middleware component, pass its middleware property to a falcon.App's middleware list:
engine = create_engine('dialect+driver://my/database') manager = falcon_sqla.Manager(engine) app = falcon.App(middleware=[manager.middleware]) # The database session will be available as req.context.session
A falcon_sqla.Manager can also explicitly provide a database session using the session_scope() context manager:
# Somewhere inside a responder with self.manager.session_scope(req, resp) as session: # Use the session # <...>
session_scope() can also be used as a standalone session context outside of the request-response cycle:
with self.manager.session_scope() as session: # Use the session # <...>
Custom Vertical Partitioning
Simple random selection of read- and write- database replicas is supported out of the box. Use the add_engine() method to instruct the Manager to include the provided engines in the runtime bind selection logic:
manager = falcon_sqla.Manager(engine) read_replica = create_engine('dialect+driver://my/database.replica') manager.add_engine(read_replica, 'r')
The Manager.get_bind() method can be overridden to implement custom engine selection logic for more complex use cases.
See also this SQLAlchemy recipe: Custom Vertical Partitioning.
Falcon is the minimalist REST API and microservices framework for Python developers, with a focus on reliability, correctness, and performance at scale.
SQLAlchemy is the Python SQL toolkit and Object Relational Mapper that gives application developers the full power and flexibility of SQL.
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