Using show all slaves status when using MariaDB to be consistent with MySQL

changelogs/fragments/602-show-all-slaves-status.yaml

@@ -0,0 +1,2 @@
+bugfixes:
+  - mysql_info - the ``slave_status`` filter was returning an empty list on MariaDB with multiple replication channels. It now returns all channels by running ``SHOW ALL SLAVES STATUS`` for MariaDB servers (https://github.com/ansible-collections/community.mysql/issues/603).

plugins/module_utils/mysql.py

@@ -207,6 +207,27 @@
     return version_str
 
 
+def get_server_implementation(cursor):
+    if 'mariadb' in get_server_version(cursor).lower():
+        return "mariadb"
+    else:
+        return "mysql"
+
+
+def is_mariadb(implementation):
+    if implementation == "mariadb":
+        return True
+    else:
+        return False
+
+
+def is_mysql(implementation):
+    if implementation == "mysql":
+        return True
+    else:
+        return False
+
+
 def set_session_vars(module, cursor, session_vars):
     """Set session vars."""
     for var, value in session_vars.items():

plugins/modules/mysql_info.py

@@ -5,6 +5,7 @@
 # GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
 
 from __future__ import absolute_import, division, print_function
+
 __metaclass__ = type
 
 DOCUMENTATION = r'''
@@ -292,6 +293,8 @@
     mysql_driver_fail_msg,
     get_connector_name,
     get_connector_version,
+    get_server_implementation,
+    is_mariadb,
 )
 
 from ansible_collections.community.mysql.plugins.module_utils.user import (
@@ -325,9 +328,10 @@ class MySQL_Info(object):
         5. add info about the new subset with an example to RETURN block
     """
 
-    def __init__(self, module, cursor):
+    def __init__(self, module, cursor, server_implementation):
         self.module = module
         self.cursor = cursor
+        self.server_implementation = server_implementation
         self.info = {
             'version': {},
             'databases': {},
@@ -497,7 +501,10 @@ def __get_master_status(self):
 
     def __get_slave_status(self):
         """Get slave status if the instance is a slave."""
-        res = self.__exec_sql('SHOW SLAVE STATUS')
+        if is_mariadb(self.server_implementation):
+            res = self.__exec_sql('SHOW ALL SLAVES STATUS')
+        else:
+            res = self.__exec_sql('SHOW SLAVE STATUS')
         if res:
             for line in res:
                 host = line['Master_Host']
@@ -738,10 +745,12 @@ def main():
                'Exception message: %s' % (connector_name, connector_version, config_file, to_native(e)))
         module.fail_json(msg)
 
+    server_implementation = get_server_implementation(cursor)
+
     ###############################
     # Create object and do main job
 
-    mysql = MySQL_Info(module, cursor)
+    mysql = MySQL_Info(module, cursor, server_implementation)
 
     module.exit_json(changed=False,
                      connector_name=connector_name,

tests/unit/plugins/module_utils/test_mysql.py

@@ -1,9 +1,10 @@
 from __future__ import (absolute_import, division, print_function)
+
 __metaclass__ = type
 
 import pytest
 
-from ansible_collections.community.mysql.plugins.module_utils.mysql import get_server_version
+from ansible_collections.community.mysql.plugins.module_utils.mysql import get_server_version, get_server_implementation, is_mariadb, is_mysql
 from ..utils import dummy_cursor_class
 
 
@@ -22,3 +23,37 @@ def test_get_server_version(cursor_return_version, cursor_return_type):
     """
     cursor = dummy_cursor_class(cursor_return_version, cursor_return_type)
     assert get_server_version(cursor) == cursor_return_version
+
+
+@pytest.mark.parametrize(
+    'cursor_return_version,cursor_return_type,server_implementation',
+    [
+        ('5.7.0-mysql', 'dict', 'mysql'),
+        ('8.0.0-mysql', 'list', 'mysql'),
+        ('10.5.0-mariadb', 'dict', 'mariadb'),
+        ('10.5.1-mariadb', 'list', 'mariadb'),
+    ]
+)
+def test_get_server_implamentation(cursor_return_version, cursor_return_type, server_implementation):
+    """
+    Test that server implementation are handled properly by get_server_implementation() whether the server version returned as a list or dict.
+    """
+    cursor = dummy_cursor_class(cursor_return_version, cursor_return_type)
+
+    assert get_server_implementation(cursor) == server_implementation
+
+
+def test_is_mysql():
+    """
+    Test that server is_mysql return expect results
+    """
+    assert is_mysql("mysql") is True
+    assert is_mysql("mariadb") is False
+
+
+def test_is_mariadb():
+    """
+    Test that server is_mariadb return expect results
+    """
+    assert is_mariadb("mariadb") is True
+    assert is_mariadb("mysql") is False

tests/unit/plugins/modules/test_mysql_info.py

@@ -14,15 +14,15 @@
 
 
 @pytest.mark.parametrize(
-    'suffix,cursor_output',
+    'suffix,cursor_output,server_implementation',
     [
-        ('mysql', '5.5.1-mysql'),
-        ('log', '5.7.31-log'),
-        ('mariadb', '10.5.0-mariadb'),
-        ('', '8.0.22'),
+        ('mysql', '5.5.1-mysql', 'mysql'),
+        ('log', '5.7.31-log', 'mysql'),
+        ('mariadb', '10.5.0-mariadb', 'mariadb'),
+        ('', '8.0.22', 'mysql'),
     ]
 )
-def test_get_info_suffix(suffix, cursor_output):
+def test_get_info_suffix(suffix, cursor_output, server_implementation):
     def __cursor_return_value(input_parameter):
         if input_parameter == "SHOW GLOBAL VARIABLES":
             cursor.fetchall.return_value = [{"Variable_name": "version", "Value": cursor_output}]
@@ -32,6 +32,6 @@ def __cursor_return_value(input_parameter):
     cursor = MagicMock()
     cursor.execute.side_effect = __cursor_return_value
 
-    info = MySQL_Info(MagicMock(), cursor)
+    info = MySQL_Info(MagicMock(), cursor, server_implementation)
 
     assert info.get_info([], [], False)['version']['suffix'] == suffix