Revert TestTransactionPingingPool which had been deleted due to misco…

…mmunication

tests/unit/test_pool.py

@@ -906,6 +906,193 @@ def test_spans_get_and_leave_empty_pool(self):
         self.assertSpanEvents("pool.Get", wantEventNames)
 
 
+class TestTransactionPingingPool(unittest.TestCase):
+    def _getTargetClass(self):
+        from google.cloud.spanner_v1.pool import TransactionPingingPool
+
+        return TransactionPingingPool
+
+    def _make_one(self, *args, **kwargs):
+        return self._getTargetClass()(*args, **kwargs)
+
+    def test_ctor_defaults(self):
+        pool = self._make_one()
+        self.assertIsNone(pool._database)
+        self.assertEqual(pool.size, 10)
+        self.assertEqual(pool.default_timeout, 10)
+        self.assertEqual(pool._delta.seconds, 3000)
+        self.assertTrue(pool._sessions.empty())
+        self.assertTrue(pool._pending_sessions.empty())
+        self.assertEqual(pool.labels, {})
+        self.assertIsNone(pool.database_role)
+
+    def test_ctor_explicit(self):
+        labels = {"foo": "bar"}
+        database_role = "dummy-role"
+        pool = self._make_one(
+            size=4,
+            default_timeout=30,
+            ping_interval=1800,
+            labels=labels,
+            database_role=database_role,
+        )
+        self.assertIsNone(pool._database)
+        self.assertEqual(pool.size, 4)
+        self.assertEqual(pool.default_timeout, 30)
+        self.assertEqual(pool._delta.seconds, 1800)
+        self.assertTrue(pool._sessions.empty())
+        self.assertTrue(pool._pending_sessions.empty())
+        self.assertEqual(pool.labels, labels)
+        self.assertEqual(pool.database_role, database_role)
+
+    def test_ctor_explicit_w_database_role_in_db(self):
+        database_role = "dummy-role"
+        pool = self._make_one()
+        database = pool._database = _Database("name")
+        SESSIONS = [_Session(database)] * 10
+        database._sessions.extend(SESSIONS)
+        database._database_role = database_role
+        pool.bind(database)
+        self.assertEqual(pool.database_role, database_role)
+
+    def test_bind(self):
+        pool = self._make_one()
+        database = _Database("name")
+        SESSIONS = [_Session(database) for _ in range(10)]
+        database._sessions.extend(SESSIONS)
+        pool.bind(database)
+
+        self.assertIs(pool._database, database)
+        self.assertEqual(pool.size, 10)
+        self.assertEqual(pool.default_timeout, 10)
+        self.assertEqual(pool._delta.seconds, 3000)
+        self.assertTrue(pool._sessions.full())
+
+        api = database.spanner_api
+        self.assertEqual(api.batch_create_sessions.call_count, 5)
+        for session in SESSIONS:
+            session.create.assert_not_called()
+            txn = session._transaction
+            txn.begin.assert_not_called()
+
+        self.assertTrue(pool._pending_sessions.empty())
+
+    def test_bind_w_timestamp_race(self):
+        import datetime
+        from google.cloud._testing import _Monkey
+        from google.cloud.spanner_v1 import pool as MUT
+
+        NOW = datetime.datetime.utcnow()
+        pool = self._make_one()
+        database = _Database("name")
+        SESSIONS = [_Session(database) for _ in range(10)]
+        database._sessions.extend(SESSIONS)
+
+        with _Monkey(MUT, _NOW=lambda: NOW):
+            pool.bind(database)
+
+        self.assertIs(pool._database, database)
+        self.assertEqual(pool.size, 10)
+        self.assertEqual(pool.default_timeout, 10)
+        self.assertEqual(pool._delta.seconds, 3000)
+        self.assertTrue(pool._sessions.full())
+
+        api = database.spanner_api
+        self.assertEqual(api.batch_create_sessions.call_count, 5)
+        for session in SESSIONS:
+            session.create.assert_not_called()
+            txn = session._transaction
+            txn.begin.assert_not_called()
+
+        self.assertTrue(pool._pending_sessions.empty())
+
+    def test_put_full(self):
+        import queue
+
+        pool = self._make_one(size=4)
+        database = _Database("name")
+        SESSIONS = [_Session(database) for _ in range(4)]
+        database._sessions.extend(SESSIONS)
+        pool.bind(database)
+
+        with self.assertRaises(queue.Full):
+            pool.put(_Session(database))
+
+        self.assertTrue(pool._sessions.full())
+
+    def test_put_non_full_w_active_txn(self):
+        pool = self._make_one(size=1)
+        session_queue = pool._sessions = _Queue()
+        pending = pool._pending_sessions = _Queue()
+        database = _Database("name")
+        session = _Session(database)
+        txn = session.transaction()
+
+        pool.put(session)
+
+        self.assertEqual(len(session_queue._items), 1)
+        _, queued = session_queue._items[0]
+        self.assertIs(queued, session)
+
+        self.assertEqual(len(pending._items), 0)
+        txn.begin.assert_not_called()
+
+    def test_put_non_full_w_committed_txn(self):
+        pool = self._make_one(size=1)
+        session_queue = pool._sessions = _Queue()
+        pending = pool._pending_sessions = _Queue()
+        database = _Database("name")
+        session = _Session(database)
+        committed = session.transaction()
+        committed.committed = True
+
+        pool.put(session)
+
+        self.assertEqual(len(session_queue._items), 0)
+
+        self.assertEqual(len(pending._items), 1)
+        self.assertIs(pending._items[0], session)
+        self.assertIsNot(session._transaction, committed)
+        session._transaction.begin.assert_not_called()
+
+    def test_put_non_full(self):
+        pool = self._make_one(size=1)
+        session_queue = pool._sessions = _Queue()
+        pending = pool._pending_sessions = _Queue()
+        database = _Database("name")
+        session = _Session(database)
+
+        pool.put(session)
+
+        self.assertEqual(len(session_queue._items), 0)
+        self.assertEqual(len(pending._items), 1)
+        self.assertIs(pending._items[0], session)
+
+        self.assertFalse(pending.empty())
+
+    def test_begin_pending_transactions_empty(self):
+        pool = self._make_one(size=1)
+        pool.begin_pending_transactions()  # no raise
+
+    def test_begin_pending_transactions_non_empty(self):
+        pool = self._make_one(size=1)
+        pool._sessions = _Queue()
+
+        database = _Database("name")
+        TRANSACTIONS = [_make_transaction(object())]
+        PENDING_SESSIONS = [_Session(database, transaction=txn) for txn in TRANSACTIONS]
+
+        pending = pool._pending_sessions = _Queue(*PENDING_SESSIONS)
+        self.assertFalse(pending.empty())
+
+        pool.begin_pending_transactions()  # no raise
+
+        for txn in TRANSACTIONS:
+            txn.begin.assert_not_called()
+
+        self.assertTrue(pending.empty())
+
+
 class TestSessionCheckout(unittest.TestCase):
     def _getTargetClass(self):
         from google.cloud.spanner_v1.pool import SessionCheckout