MDEV-27691: make working view-protocol

Added ability to disable/enable (--disable_view_protocol/--enable_view_protocol) view-protocol in tests.
When the  option "--disable_view_protocol" is used  util connections are closed.
Added new test for checking view-protocol

client/mysqltest.cc

@@ -155,6 +155,7 @@ static struct property prop_list[] = {
   { &display_session_track_info, 0, 1, 1, "$ENABLED_STATE_CHANGE_INFO" },
   { &display_metadata, 0, 0, 0, "$ENABLED_METADATA" },
   { &ps_protocol_enabled, 0, 0, 0, "$ENABLED_PS_PROTOCOL" },
+  { &view_protocol_enabled, 0, 0, 0, "$ENABLED_VIEW_PROTOCOL"},
   { &disable_query_log, 0, 0, 1, "$ENABLED_QUERY_LOG" },
   { &disable_result_log, 0, 0, 1, "$ENABLED_RESULT_LOG" },
   { &disable_warnings, 0, 0, 1, "$ENABLED_WARNINGS" }
@@ -169,6 +170,7 @@ enum enum_prop {
   P_SESSION_TRACK,
   P_META,
   P_PS,
+  P_VIEW,
   P_QUERY,
   P_RESULT,
   P_WARN,
@@ -374,6 +376,7 @@ enum enum_commands {
   Q_LOWERCASE,
   Q_START_TIMER, Q_END_TIMER,
   Q_CHARACTER_SET, Q_DISABLE_PS_PROTOCOL, Q_ENABLE_PS_PROTOCOL,
+  Q_DISABLE_VIEW_PROTOCOL, Q_ENABLE_VIEW_PROTOCOL,
   Q_ENABLE_NON_BLOCKING_API, Q_DISABLE_NON_BLOCKING_API,
   Q_DISABLE_RECONNECT, Q_ENABLE_RECONNECT,
   Q_IF,
@@ -460,6 +463,8 @@ const char *command_names[]=
   "character_set",
   "disable_ps_protocol",
   "enable_ps_protocol",
+  "disable_view_protocol",
+  "enable_view_protocol",
   "enable_non_blocking_api",
   "disable_non_blocking_api",
   "disable_reconnect",
@@ -1397,6 +1402,16 @@ void close_connections()
   DBUG_VOID_RETURN;
 }
 
+void close_util_connections()
+{
+  DBUG_ENTER("close_util_connections");
+  if (cur_con->util_mysql)
+  {
+    mysql_close(cur_con->util_mysql);
+    cur_con->util_mysql = 0;
+  }
+  DBUG_VOID_RETURN;
+}
 
 void close_statements()
 {
@@ -9664,6 +9679,14 @@ int main(int argc, char **argv)
       case Q_ENABLE_PS_PROTOCOL:
         set_property(command, P_PS, ps_protocol);
         break;
+      case Q_DISABLE_VIEW_PROTOCOL:
+        set_property(command, P_VIEW, 0);
+        /* Close only util connections */
+        close_util_connections();
+        break;
+      case Q_ENABLE_VIEW_PROTOCOL:
+        set_property(command, P_VIEW, view_protocol);
+        break;
       case Q_DISABLE_NON_BLOCKING_API:
         non_blocking_api_enabled= 0;
         break;

mysql-test/include/have_view_protocol.inc

+# The file with expected results fits only to a run with
+# view-protocol.
+if (`SELECT $VIEW_PROTOCOL = 0`)
+{
+   --skip Test requires view-protocol
+}
\ No newline at end of file

mysql-test/main/check_view_protocol.result

+flush status;
+create table t1 (a int);
+insert into t1 (a) values (1);
+create table t2 (b int);
+insert into t2 (b) values (2);
+select * from t1;
+a
+1
+show status like 'Opened_views';
+Variable_name	Value
+Opened_views	1
+flush status;
+select * from t2;
+b
+2
+show status like 'Opened_views';
+Variable_name	Value
+Opened_views	0
+drop table t1, t2;

mysql-test/main/check_view_protocol.test

+-- source include/have_view_protocol.inc
+
+flush status;
+
+create table t1 (a int);
+insert into t1 (a) values (1);
+create table t2 (b int);
+insert into t2 (b) values (2);
+select * from t1;
+show status like 'Opened_views';
+
+flush status;
+--disable_view_protocol
+select * from t2;
+--enable_view_protocol
+
+show status like 'Opened_views';
+
+drop table t1, t2;
+
+