examples: add DNS example with python and GObject introspection

examples/python/gi/dns.py

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+#!/usr/bin/env python
+#
+# vim: ft=python ts=4 sts=4 sw=4 et ai
+# -*- Mode: Python; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+# Copyright (C) 2016 Red Hat, Inc.
+#
+
+import sys
+import gi
+gi.require_version('NM', '1.0')
+from gi.repository import GLib, NM
+
+#  This example shows how to monitor the DNS configuration
+
+main_loop = None
+
+def handle_config(config):
+    print " ---- new configuration ----"
+    for entry in config:
+        print " * servers: %s" % ', '.join(map(str, entry.get_nameservers()))
+
+        domains = entry.get_domains()
+        if domains and domains[0]:
+                print "   domains: %s" % ', '.join(map(str, domains))
+
+        if entry.get_interface():
+                print "   interface: %s" % entry.get_interface()
+
+        print "   priority: %d" % entry.get_priority()
+
+        if entry.get_vpn():
+            print "   vpn: yes"
+
+        print ""
+
+def dns_config_changed(self, property):
+    handle_config(self.get_dns_configuration())
+
+main_loop = None
+
+if __name__ == "__main__":
+    c = NM.Client.new(None)
+    c.connect("notify::dns-configuration", dns_config_changed)
+
+    handle_config(c.get_dns_configuration())
+
+    main_loop = GLib.MainLoop()
+    main_loop.run()