MXS-2276 Use dynamic servers also for cluster check

Once the monitor has been able to connect to a clustrix node and obtain the clustrix nodes, it'll primarily use those nodes when looking for a Clustrix node to be used as the "hub". With this change it is sufficient (but perhaps unwise) to provide a single node boostrap node in the configuration file. Some other rearrangements and renamings of functions has also been made.
2019-01-23 10:07:48 +02:00
parent 0fe5b0bec9
commit 42b3402a71
7 changed files with 404 additions and 238 deletions
--- a/server/modules/monitor/clustrixmon/clustrix.cc
+++ b/server/modules/monitor/clustrixmon/clustrix.cc
@ -86,3 +86,92 @@ Clustrix::SubState Clustrix::substate_from_string(const std::string& substate)
        return SubState::UNKNOWN;
    }
 }
+
+bool Clustrix::is_part_of_the_quorum(const SERVER& server, MYSQL* pCon)
+{
+    bool rv = false;
+
+    const char* zAddress = server.address;
+    int port = server.port;
+
+    const char ZQUERY_TEMPLATE[] =
+        "SELECT ms.status FROM system.membership AS ms INNER JOIN system.nodeinfo AS ni "
+        "ON ni.nodeid = ms.nid WHERE ni.iface_ip = '%s'";
+
+    char zQuery[sizeof(ZQUERY_TEMPLATE) + strlen(zAddress)];
+
+    sprintf(zQuery, ZQUERY_TEMPLATE, zAddress);
+
+    if (mysql_query(pCon, zQuery) == 0)
+    {
+        MYSQL_RES* pResult = mysql_store_result(pCon);
+
+        if (pResult)
+        {
+            mxb_assert(mysql_field_count(pCon) == 1);
+
+            MYSQL_ROW row;
+            while ((row = mysql_fetch_row(pResult)) != nullptr)
+            {
+                if (row[0])
+                {
+                    Clustrix::Status status = Clustrix::status_from_string(row[0]);
+
+                    switch (status)
+                    {
+                    case Clustrix::Status::QUORUM:
+                        rv = true;
+                        break;
+
+                    case Clustrix::Status::STATIC:
+                        MXS_NOTICE("Node %s:%d is not part of the quorum, switching to "
+                                   "other node for monitoring.", zAddress, port);
+                        break;
+
+                    case Clustrix::Status::UNKNOWN:
+                        MXS_WARNING("Do not know how to interpret '%s'. Assuming node %s:%d "
+                                    "is not part of the quorum.", row[0], zAddress, port);
+                    }
+                }
+                else
+                {
+                    MXS_WARNING("No status returned for '%s' on %s:%d.", zQuery, zAddress, port);
+                }
+            }
+
+            mysql_free_result(pResult);
+        }
+        else
+        {
+            MXS_WARNING("No result returned for '%s' on %s:%d.", zQuery, zAddress, port);
+        }
+    }
+    else
+    {
+        MXS_ERROR("Could not execute '%s' on %s:%d: %s", zQuery, zAddress, port, mysql_error(pCon));
+    }
+
+    return rv;
+}
+
+bool Clustrix::ping_or_connect_to_hub(const MXS_MONITOR& mon, SERVER& server, MYSQL** ppCon)
+{
+    bool connected = false;
+
+    mxs_connect_result_t rv = mon_ping_or_connect_to_db(mon, server, ppCon);
+
+    if (mon_connection_is_ok(rv))
+    {
+        if (Clustrix::is_part_of_the_quorum(server, *ppCon))
+        {
+            connected = true;
+        }
+    }
+    else
+    {
+        MXS_ERROR("Could either not ping or create connection to %s:%d: %s",
+                  server.address, server.port, mysql_error(*ppCon));
+    }
+
+    return connected;
+}