(hopefully) Fix pool.transaction to always close connection

Author: nhumrich

asyncpgsa/transactionmanager.py

@@ -1,3 +1,4 @@
+import asyncio
 
 
 class ConnectionTransactionContextManager:
@@ -35,5 +36,10 @@ async def __aenter__(self):
         return con
 
     async def __aexit__(self, exc_type, exc_val, exc_tb):
-        await self.transaction.__aexit__(exc_type, exc_val, exc_tb)
-        await self.acquire_context.__aexit__(exc_type, exc_val, exc_tb)
+        async def _close():
+            try:
+                await self.transaction.__aexit__(exc_type, exc_val, exc_tb)
+            finally:
+                await self.acquire_context.__aexit__(exc_type, exc_val, exc_tb)
+
+        await asyncio.shield(_close())

asyncpgsa/version.py

@@ -1 +1 @@
-__version__ = '0.19.1'
+__version__ = '0.19.2'