use cluster admin user when checking upgradability, use default port (#520)

Author: paulomach

lib/charms/mysql/v0/mysql.py

@@ -134,7 +134,7 @@ def wait_until_mysql_connection(self) -> None:
 # Increment this major API version when introducing breaking changes
 LIBAPI = 0
 
-LIBPATCH = 71
+LIBPATCH = 72
 
 UNIT_TEARDOWN_LOCKNAME = "unit-teardown"
 UNIT_ADD_LOCKNAME = "unit-add"
@@ -2247,8 +2247,9 @@ def get_cluster_members_addresses(self) -> Optional[Iterable[str]]:
 
     def verify_server_upgradable(self, instance: Optional[str] = None) -> None:
         """Wrapper for API check_for_server_upgrade."""
+        # use cluster admin user to enforce standard port usage
         check_command = [
-            f"shell.connect('{self.instance_def(self.server_config_user, host=instance)}')",
+            f"shell.connect('{self.instance_def(self.cluster_admin_user, host=instance)}')",
             "try:",
             "    util.check_for_server_upgrade(options={'outputFormat': 'JSON'})",
             "except ValueError:",  # ValueError is raised for same version check

tests/unit/test_mysql.py

@@ -1728,7 +1728,7 @@ def test_set_cluster_primary(self, _run_mysqlsh_script):
     def test_verify_server_upgradable(self, _run_mysqlsh_script):
         """Test is_server_upgradable."""
         commands = (
-            "shell.connect('serverconfig:[email protected]:33062')",
+            "shell.connect('clusteradmin:[email protected]:3306')",
             "try:\n    util.check_for_server_upgrade(options={'outputFormat': 'JSON'})",
             "except ValueError:",
             "    if session.run_sql('select @@version').fetch_all()[0][0].split('-')[0] == shell.version.split()[1]:",
@@ -1752,7 +1752,7 @@ def test_verify_server_upgradable(self, _run_mysqlsh_script):
             '"detectedProblems": [] }],'
             '"manualChecks": []}'
         )
-        self.mysql.verify_server_upgradable()
+        self.mysql.verify_server_upgradable("2.3.4.5")
         _run_mysqlsh_script.assert_called_with("\n".join(commands))
         _run_mysqlsh_script.return_value = (
             '{"serverAddress": "10.1.148.145:33060",'