Merge branch '2.3' into 2.4

system-test/mariadbmonitor/mysqlmon_enforce_simple.cpp

@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2019 MariaDB Corporation Ab
+ *
+ * Use of this software is governed by the Business Source License included
+ * in the LICENSE.TXT file and at www.mariadb.com/bsl11.
+ *
+ * Change Date: 2024-07-07
+ *
+ * On the date above, in accordance with the Business Source License, use
+ * of this software will be governed by version 2 or later of the General
+ * Public License.
+ */
+
+#include <maxtest/testconnections.hh>
+#include <iostream>
+#include <maxbase/format.hh>
+
+using std::string;
+using std::cout;
+
+int get_master_server_id(TestConnections& test)
+{
+    MYSQL* conn = test.maxscales->open_rwsplit_connection(0);
+    int id = -1;
+    char str[1024];
+
+    if (find_field(conn, "SELECT @@server_id, @@last_insert_id;", "@@server_id", str) == 0)
+    {
+        id = atoi(str);
+    }
+
+    mysql_close(conn);
+    return id;
+}
+
+int main(int argc, char** argv)
+{
+    Mariadb_nodes::require_gtid(true);
+    TestConnections::skip_maxscale_start(true);
+
+    TestConnections test(argc, argv);
+
+    if (test.repl->N < 4)
+    {
+        test.expect(false, "This test requires at least 4 backends.");
+        return test.global_result;
+    }
+
+    test.repl->connect();
+    auto server_ids = test.repl->get_all_server_ids();
+
+    // Stop the master and the last slave, then start MaxScale.
+    int master_ind = 0;
+    int last_slave_ind = 3;
+
+    string master_name = mxb::string_printf("server%i", master_ind + 1);
+    string slave_name = mxb::string_printf("server%i", last_slave_ind + 1);
+
+    test.tprintf("Stopping %s and %s.", master_name.c_str(), slave_name.c_str());
+    test.repl->stop_node(master_ind);
+    test.repl->stop_node(last_slave_ind);
+
+    test.tprintf("Starting MaxScale");
+    test.start_maxscale(0);
+
+    sleep(3);
+    test.maxscales->wait_for_monitor(3);
+
+    test.log_includes(0, "Performing automatic failover");
+    int new_master_id = get_master_server_id(test);
+    int expected_id1 = server_ids[1];
+    int expected_id2 = server_ids[2];
+    test.expect(new_master_id == expected_id1 || new_master_id == expected_id2,
+                "Unexpected master server id. Got %i when %i or %i was expected.",
+                new_master_id, expected_id1, expected_id2);
+
+    if (test.ok())
+    {
+        // Restart server4, check that it rejoins.
+        test.repl->start_node(last_slave_ind, (char*)"");
+        test.maxscales->wait_for_monitor(2);
+
+        auto states = test.maxscales->get_server_status(slave_name.c_str());
+        test.expect(states.count("Slave") == 1, "%s is not replicating as it should.", slave_name.c_str());
+    }
+
+    if (test.ok())
+    {
+        // Finally, bring back old master and swap to it.
+        test.repl->start_node(master_ind, (char*)"");
+        test.maxscales->wait_for_monitor(2);
+
+        test.tprintf("Switching back old master %s.", master_name.c_str());
+        string switchover = "call command mariadbmon switchover MariaDB-Monitor " + master_name;
+        test.maxscales->execute_maxadmin_command(0, switchover.c_str());
+        test.maxscales->wait_for_monitor(2);
+        new_master_id = get_master_server_id(test);
+        test.expect(new_master_id == server_ids[master_ind], "Switchover to original master failed.");
+    }
+    return test.global_result;
+}