66 lines
2.0 KiB
Python
66 lines
2.0 KiB
Python
import sqlalchemy
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import cherrypy
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from cherrypy.process import plugins
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from sqlalchemy.ext.declarative import declarative_base
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Base = declarative_base()
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def db():
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return cherrypy.request.db
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class SAEnginePlugin(plugins.SimplePlugin):
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def __init__(self, bus, dbcon):
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plugins.SimplePlugin.__init__(self, bus)
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self.sa_engine = dbcon
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self.bus.subscribe("bind", self.bind)
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def start(self):
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Base.metadata.create_all(self.sa_engine)
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def bind(self, session):
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session.configure(bind=self.sa_engine)
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class SATool(cherrypy.Tool):
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def __init__(self):
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"""
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The SA tool is responsible for associating a SA session
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to the SA engine and attaching it to the current request.
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Since we are running in a multithreaded application,
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we use the scoped_session that will create a session
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on a per thread basis so that you don't worry about
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concurrency on the session object itself.
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This tools binds a session to the engine each time
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a requests starts and commits/rollbacks whenever
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the request terminates.
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"""
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cherrypy.Tool.__init__(self, 'before_request_body',
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self.bind_session,
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priority=100)
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self.session = sqlalchemy.orm.scoped_session(
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sqlalchemy.orm.sessionmaker(autoflush=True, autocommit=False))
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def _setup(self):
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cherrypy.Tool._setup(self)
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cherrypy.request.hooks.attach('on_end_resource', self.commit_transaction, priority=80)
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def bind_session(self):
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cherrypy.engine.publish('bind', self.session)
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cherrypy.request.db = self.session
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cherrypy.request.db.connection().connection.connection.ping()
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def commit_transaction(self):
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cherrypy.request.db = None
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try:
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self.session.commit()
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except Exception:
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self.session.rollback()
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raise
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finally:
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self.session.remove()
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