database: add session tracking

IzzyLib/database.py

@@ -6,7 +6,7 @@ from sqlalchemy import create_engine, ForeignKey, MetaData, Table
 from sqlalchemy import Column as SqlColumn, types as Types
 #from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.exc import OperationalError, ProgrammingError
-from sqlalchemy.orm import sessionmaker
+from sqlalchemy.orm import scoped_session, sessionmaker
 
 from . import logging
 from .cache import LRUCache
@@ -27,6 +27,7 @@ class DataBase():
 
 		session_class = kwargs.get('session_class', Session)
 		self.session = lambda trans=True: session_class(self, trans)
+		self.sessions = {}
 
 		self.SetupCache()
 
@@ -109,7 +110,7 @@ class Session(object):
 	def __init__(self, db, trans=True):
 		self.db = db
 		self.classes = self.db.classes
-		self.session = sessionmaker(bind=db.db)()
+		self.session = scoped_session(sessionmaker(bind=db.db))()
 		self.table = self.db.table
 		self.cache = self.db.cache
 		self.trans = trans
@@ -121,6 +122,7 @@ class Session(object):
 		self.rollback = self.s.rollback
 		self.query = self.s.query
 		self.execute = self.s.execute
+		self.close = self.s.close
 
 		self._setup()
 
@@ -130,6 +132,7 @@ class Session(object):
 
 	def __enter__(self):
 		self.sessionid = RandomGen(10)
+		self.db.sessions[self.sessionid] = self
 		return self
 
 
@@ -137,8 +140,9 @@ class Session(object):
 		if tb:
 			self.rollback()
 
-		else:
-			self.commit()
+		self.commit()
+		self.close()
+		del self.db.sessions[self.sessionid]
 
 
 	def _setup(self):