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import peewee
from peewee import *
from flask_peewee.exceptions import ImproperlyConfigured
from flask_peewee.utils import load_class
class Database(object):
def __init__(self, app, database=None):
self.app = app
self.database = database
if self.database is None:
self.load_database()
self.register_handlers()
self.Model = self.get_model_class()
def load_database(self):
self.database_config = dict(self.app.config['DATABASE'])
try:
self.database_name = self.database_config.pop('name')
self.database_engine = self.database_config.pop('engine')
except KeyError:
raise ImproperlyConfigured('Please specify a "name" and "engine" for your database')
try:
self.database_class = load_class(self.database_engine)
assert issubclass(self.database_class, peewee.Database)
except ImportError:
raise ImproperlyConfigured('Unable to import: "%s"' % self.database_engine)
except AttributeError:
raise ImproperlyConfigured('Database engine not found: "%s"' % self.database_engine)
except AssertionError:
raise ImproperlyConfigured('Database engine not a subclass of peewee.Database: "%s"' % self.database_engine)
self.database = self.database_class(self.database_name, **self.database_config)
def get_model_class(self):
class BaseModel(Model):
class Meta:
database = self.database
return BaseModel
def connect_db(self):
if self.database.is_closed():
self.database.connect()
def close_db(self, exc):
if not self.database.is_closed():
self.database.close()
def register_handlers(self):
self.app.before_request(self.connect_db)
self.app.teardown_request(self.close_db)
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