MXS-2441: Add galera with slaves test case

The test checks that servers replicating from Galera nodes work as
expected.

maxscale-system-test/CMakeLists.txt

@@ -946,6 +946,9 @@ add_test_executable(mxs2417_ignore_persisted_cnf.cpp mxs2417_ignore_persisted_cn
 # MXS-1662: PAM admin authentication
 add_test_executable(mxs1662_pam_admin.cpp mxs1662_pam_admin mxs1662_pam_admin LABELS REPL_BACKEND)
 
+# MXS-2441: Add support for read-only slaves to galeramon
+add_test_executable(mxs2441_galera_slaves.cpp mxs2441_galera_slaves mxs2441_galera_slaves LABELS REPL_BACKEND GALERA_BACKEND)
+
 ############################################
 # BEGIN: binlogrouter and avrorouter tests #
 ############################################

maxscale-system-test/cnf/maxscale.cnf.template.mxs2441_galera_slaves

@@ -0,0 +1,76 @@
+[maxscale]
+threads=###threads###
+
+[server1]
+type=server
+address=###node_server_IP_1###
+port=###node_server_port_1###
+protocol=MySQLBackend
+
+[server2]
+type=server
+address=###node_server_IP_2###
+port=###node_server_port_2###
+protocol=MySQLBackend
+
+[server3]
+type=server
+address=###node_server_IP_3###
+port=###node_server_port_3###
+protocol=MySQLBackend
+
+[server4]
+type=server
+address=###node_server_IP_4###
+port=###node_server_port_4###
+protocol=MySQLBackend
+
+[gserver1]
+type=server
+address=###galera_server_IP_1###
+port=###galera_server_port_1###
+protocol=MySQLBackend
+
+[gserver2]
+type=server
+address=###galera_server_IP_2###
+port=###galera_server_port_2###
+protocol=MySQLBackend
+
+[gserver3]
+type=server
+address=###galera_server_IP_3###
+port=###galera_server_port_3###
+protocol=MySQLBackend
+
+[gserver4]
+type=server
+address=###galera_server_IP_4###
+port=###galera_server_port_4###
+protocol=MySQLBackend
+
+[Galera-Monitor]
+type=monitor
+module=galeramon
+servers=server1,server2,server3,server4,gserver1,gserver2,gserver3,gserver4
+user=maxskysql
+password=skysql
+monitor_interval=1000
+
+[Hint]
+type=filter
+module=hintfilter
+
+[RW-Split-Router]
+type=service
+router=readwritesplit
+servers=server1,server2,server3,server4,gserver1,gserver2,gserver3,gserver4
+user=maxskysql
+password=skysql
+filters=Hint
+
+[RW-Split-Listener]
+type=listener
+service=RW-Split-Router
+protocol=MySQLClient
+port=4006

maxscale-system-test/mariadb_nodes.cpp

@@ -1443,16 +1443,21 @@ int Mariadb_nodes::prepare_servers()
 }
 
 void Mariadb_nodes::replicate_from(int slave, int master, const char* type)
+{
+    replicate_from(slave, IP[master], port[master], type);
+}
+
+void Mariadb_nodes::replicate_from(int slave, const std::string& host, uint16_t port, const char* type)
 {
     std::stringstream change_master;
-    change_master << "CHANGE MASTER TO MASTER_HOST = '" << IP[master]
-                  << "', MASTER_PORT = " << port[master] << ", MASTER_USE_GTID = " << type << ", "
-                                                                                "MASTER_USER='repl', MASTER_PASSWORD='repl';";
+    change_master << "CHANGE MASTER TO MASTER_HOST = '" << host
+                  << "', MASTER_PORT = " << port << ", MASTER_USE_GTID = "
+                  << type << ", MASTER_USER='repl', MASTER_PASSWORD='repl';";
 
     if (verbose)
     {
-        std::cout << "Server " << slave + 1 << " starting to replicate from server " << master + 1
-                  << std::endl;
+        std::cout << "Server " << slave + 1
+                  << " starting to replicate from server " << master + 1 << std::endl;
         std::cout << "Query is '" << change_master.str() << "'" << std::endl;
     }
 

maxscale-system-test/mariadb_nodes.h

@@ -477,6 +477,9 @@ public:
      */
     void replicate_from(int slave, int master, const char* type = "current_pos");
 
+    // Replicates from a host and a port instead of a known server
+    void replicate_from(int slave, const std::string& host, uint16_t port, const char* type = "current_pos");
+
 private:
 
     bool check_master_node(MYSQL* conn);

maxscale-system-test/mxs2441_galera_slaves.cpp

@@ -0,0 +1,64 @@
+/**
+ * MXS-2441: Add support for read-only slaves to galeramon
+ * https://jira.mariadb.org/browse/MXS-2441
+ */
+
+#include "testconnections.h"
+#include <iostream>
+
+#include <maxbase/string.hh>
+
+int main(int argc, char* argv[])
+{
+    TestConnections test(argc, argv);
+    test.repl->connect();
+    test.galera->connect();
+
+    for (int i = 0; i < 4; i++)
+    {
+        test.repl->replicate_from(i, test.galera->ip(0), test.galera->port[0]);
+    }
+
+    test.maxscales->wait_for_monitor();
+
+    auto output = mxb::strtok(test.maxctrl("list servers").second, "\n");
+    int n_slaves = std::count_if(output.begin(), output.end(), [](const std::string& line) {
+                                     return line.find("Slave") != std::string::npos;
+                                 });
+    int n_masters = std::count_if(output.begin(), output.end(), [](const std::string& line) {
+                                      return line.find("Master") != std::string::npos;
+                                  });
+    int n_synced = std::count_if(output.begin(), output.end(), [](const std::string& line) {
+                                     return line.find("Synced") != std::string::npos;
+                                 });
+
+    test.expect(n_slaves == 7, "Expected 7 slaves but got %d", n_slaves);
+    test.expect(n_masters == 1, "Expected 1 master but got %d", n_masters);
+    test.expect(n_synced == 4, "Expected 4 synced but got %d", n_synced);
+
+    // Check that the queries are routed to the right server
+    auto repl_ids = test.repl->get_all_server_ids_str();
+    auto galera_ids = test.galera->get_all_server_ids_str();
+    auto c = test.maxscales->rwsplit();
+    test.expect(c.connect(), "Could not connect to maxscale: %s", c.error());
+
+    for (int i = 0; i < 4; i++)
+    {
+        std::string q = "SELECT @@server_id -- maxscale route to server server" + std::to_string(i + 1);
+        auto res = c.field(q);
+        test.expect(res == repl_ids[i], "Wrong ID: %s(rwsplit) != %s(server)",
+                    res.c_str(), repl_ids[i].c_str());
+    }
+
+    for (int i = 0; i < 4; i++)
+    {
+        std::string q = "SELECT @@server_id -- maxscale route to server gserver" + std::to_string(i + 1);
+        auto res = c.field(q);
+        test.expect(res == galera_ids[i], "Wrong ID: %s(rwsplit) != %s(gserver)",
+                    res.c_str(), repl_ids[i].c_str());
+    }
+
+    test.repl->fix_replication();
+
+    return test.global_result;
+}