DbAPiHook: Don't log a warning message if placeholder is None and mak…

…e sure warning message is formatted correctly (#39690)

* fix: Don't log a warning message if placeholder is None and make sure if the placeholder is invalid that the warning message is logged correctly

* refactor: Also make sure to verify that log.warning isn't invoked when placeholder is valid

* refactor: All assertions regarding the logging are now done through caplog

* refactor: Reformatted logging assertions

* refactor: Reformatted logging assertion

---------

Co-authored-by: David Blain <david.blain@infrabel.be>

airflow/providers/common/sql/hooks/sql.py

@@ -185,14 +185,15 @@ def __init__(self, *args, schema: str | None = None, log_sql: bool = True, **kwa
     def placeholder(self):
         conn = self.get_connection(getattr(self, self.conn_name_attr))
         placeholder = conn.extra_dejson.get("placeholder")
-        if placeholder in SQL_PLACEHOLDERS:
-            return placeholder
-        self.log.warning(
-            "Placeholder defined in Connection '%s' is not listed in 'DEFAULT_SQL_PLACEHOLDERS' "
-            "and got ignored. Falling back to the default placeholder '%s'.",
-            placeholder,
-            self._placeholder,
-        )
+        if placeholder:
+            if placeholder in SQL_PLACEHOLDERS:
+                return placeholder
+            self.log.warning(
+                "Placeholder defined in Connection '%s' is not listed in 'DEFAULT_SQL_PLACEHOLDERS' "
+                "and got ignored. Falling back to the default placeholder '%s'.",
+                self.conn_name_attr,
+                self._placeholder,
+            )
         return self._placeholder
 
     def get_conn(self):

tests/providers/common/sql/hooks/test_dbapi.py

@@ -46,11 +46,11 @@ def setup_method(self, **kwargs):
         self.conn = mock.MagicMock()
         self.conn.cursor.return_value = self.cur
         self.conn.schema.return_value = "test_schema"
+        self.conn.extra_dejson = {}
         conn = self.conn
 
         class DbApiHookMock(DbApiHook):
             conn_name_attr = "test_conn_id"
-            log = mock.MagicMock(spec=logging.Logger)
 
             @classmethod
             def get_connection(cls, conn_id: str) -> Connection:
@@ -63,6 +63,7 @@ def get_conn(self):
         self.db_hook_no_log_sql = DbApiHookMock(log_sql=False)
         self.db_hook_schema_override = DbApiHookMock(schema="schema-override")
         self.db_hook.supports_executemany = False
+        self.db_hook.log.setLevel(logging.DEBUG)
 
     def test_get_records(self):
         statement = "SQL"
@@ -193,39 +194,47 @@ def test_insert_rows_replace_executemany_hana_dialect(self):
         sql = f"UPSERT {table}  VALUES (%s) WITH PRIMARY KEY"
         self.cur.executemany.assert_any_call(sql, rows)
 
-    def test_insert_rows_as_generator(self):
+    def test_insert_rows_as_generator(self, caplog):
         table = "table"
         rows = [("What's",), ("up",), ("world",)]
 
-        self.db_hook.insert_rows(table, iter(rows))
+        with caplog.at_level(logging.DEBUG):
+            self.db_hook.insert_rows(table, iter(rows))
 
         assert self.conn.close.call_count == 1
         assert self.cur.close.call_count == 1
         assert self.conn.commit.call_count == 2
 
         sql = f"INSERT INTO {table}  VALUES (%s)"
 
-        self.db_hook.log.debug.assert_called_with("Generated sql: %s", sql)
-        self.db_hook.log.info.assert_called_with("Done loading. Loaded a total of %s rows into %s", 3, table)
+        assert any(f"Generated sql: {sql}" in message for message in caplog.messages)
+        assert any(
+            f"Done loading. Loaded a total of 3 rows into {table}" in message for message in caplog.messages
+        )
 
         for row in rows:
             self.cur.execute.assert_any_call(sql, row)
 
-    def test_insert_rows_as_generator_supports_executemany(self):
+    def test_insert_rows_as_generator_supports_executemany(self, caplog):
         table = "table"
         rows = [("What's",), ("up",), ("world",)]
 
-        self.db_hook.supports_executemany = True
-        self.db_hook.insert_rows(table, iter(rows))
+        with caplog.at_level(logging.DEBUG):
+            self.db_hook.supports_executemany = True
+            self.db_hook.insert_rows(table, iter(rows))
 
         assert self.conn.close.call_count == 1
         assert self.cur.close.call_count == 1
         assert self.conn.commit.call_count == 2
 
         sql = f"INSERT INTO {table}  VALUES (%s)"
 
-        self.db_hook.log.debug.assert_called_with("Generated sql: %s", sql)
-        self.db_hook.log.info.assert_called_with("Done loading. Loaded a total of %s rows into %s", 3, table)
+        assert any(f"Generated sql: {sql}" in message for message in caplog.messages)
+        assert any(f"Loaded 3 rows into {table} so far" in message for message in caplog.messages)
+        assert any(
+            f"Done loading. Loaded a total of 3 rows into {table}" in message for message in caplog.messages
+        )
+
         self.cur.executemany.assert_any_call(sql, rows)
 
     def test_get_uri_schema_not_none(self):
@@ -421,15 +430,61 @@ def test_get_uri_without_auth_and_empty_host(self):
         )
         assert self.db_hook.get_uri() == "conn-type://@:3306/schema?charset=utf-8"
 
-    def test_run_log(self):
+    def test_placeholder(self, caplog):
+        self.db_hook.get_connection = mock.MagicMock(
+            return_value=Connection(
+                conn_type="conn-type",
+                login=None,
+                password=None,
+                schema="schema",
+                port=3306,
+            )
+        )
+        assert self.db_hook.placeholder == "%s"
+        assert not caplog.messages
+
+    def test_placeholder_with_valid_placeholder_in_extra(self, caplog):
+        self.db_hook.get_connection = mock.MagicMock(
+            return_value=Connection(
+                conn_type="conn-type",
+                login=None,
+                password=None,
+                schema="schema",
+                port=3306,
+                extra=json.dumps({"placeholder": "?"}),
+            )
+        )
+        assert self.db_hook.placeholder == "?"
+        assert not caplog.messages
+
+    def test_placeholder_with_invalid_placeholder_in_extra(self, caplog):
+        self.db_hook.get_connection = mock.MagicMock(
+            return_value=Connection(
+                conn_type="conn-type",
+                login=None,
+                password=None,
+                schema="schema",
+                port=3306,
+                extra=json.dumps({"placeholder": "!"}),
+            )
+        )
+
+        assert self.db_hook.placeholder == "%s"
+        assert any(
+            "Placeholder defined in Connection 'test_conn_id' is not listed in 'DEFAULT_SQL_PLACEHOLDERS' "
+            "and got ignored. Falling back to the default placeholder '%s'." in message
+            for message in caplog.messages
+        )
+
+    def test_run_log(self, caplog):
         statement = "SQL"
         self.db_hook.run(statement)
-        assert self.db_hook.log.info.call_count == 2
+        assert len(caplog.messages) == 2
 
-    def test_run_no_log(self):
+    def test_run_no_log(self, caplog):
         statement = "SQL"
         self.db_hook_no_log_sql.run(statement)
-        assert self.db_hook_no_log_sql.log.info.call_count == 1
+        assert len(caplog.messages) == 1
 
     def test_run_with_handler(self):
         sql = "SQL"