refactor: check connection connected before append to free list

.github/workflows/ci.yml

@@ -2,12 +2,13 @@ name: ci
 on:
   push:
     branches-ignore:
-      - master
+      - main
   pull_request:
     branches-ignore:
       - master
 jobs:
   test:
+    if: ${{ !(github.event_name == 'pull_request' && github.event.pull_request.base.repo.full_name == github.repository) }}
     runs-on: ubuntu-22.04
     services:
       mssql:
@@ -57,6 +58,7 @@ jobs:
           COVERALLS_PARALLEL: true
 
   coveralls:
+    if: ${{ !(github.event_name == 'pull_request' && github.event.pull_request.base.repo.full_name == github.repository) }}
     name: Finish Coveralls
     needs: test
     runs-on: ubuntu-22.04

asyncodbc/pool.py

@@ -192,7 +192,7 @@ async def release(self, conn):
             self._terminated.remove(conn)
             return
         self._used.remove(conn)
-        if not conn.closed:
+        if conn.connected and not conn.closed:
             if self._closing:
                 await conn.close()
             else:

tests/test_pool.py

@@ -60,9 +60,9 @@ async def test_release_closed(pool):
     assert 0 == pool.freesize
     await conn.close()
     await pool.release(conn)
-    assert 1 == pool.freesize
+    assert 0 == pool.freesize
     assert not pool._used
-    assert 1 == pool.size
+    assert 0 == pool.size
 
     conn2 = await pool.acquire()
     assert 0 == pool.freesize