daemon: sync with opennebula on defined interval

- Added --sync-interval option that defaults to 5 minutes

onedns/cli.py

@@ -6,11 +6,12 @@ from onedns import logger
 
 
 def daemon(args, one_args, **kwargs):
-    testing = kwargs.get('testing', False)
-    vms = kwargs.get('vms')
+    test = kwargs.get('test', False)
+    test_vms = kwargs.get('test_vms')
     srv = server.OneDNS(args.domain, one_kwargs=one_args)
-    srv.sync(vms=vms)
-    srv.daemon(dns_port=args.dns_port, testing=testing)
+    srv.daemon(dns_port=args.dns_port,
+               sync_interval=args.sync_interval,
+               test=test, test_vms=test_vms)
 
 
 def shell(args, one_args, **kwargs):
@@ -20,6 +21,17 @@ def shell(args, one_args, **kwargs):
     utils.shell(local_ns=ns)
 
 
+def positive_int(value):
+    errmsg = "an integer greater than zero is required"
+    try:
+        ivalue = int(value)
+    except ValueError:
+        raise argparse.ArgumentTypeError(errmsg)
+    if ivalue <= 0:
+        raise argparse.ArgumentTypeError(errmsg)
+    return ivalue
+
+
 def get_parser():
     parser = argparse.ArgumentParser(
         description='OneDNS - Dynamic DNS for OpenNebula')
@@ -39,8 +51,11 @@ def get_parser():
     daemon_parser = subparsers.add_parser('daemon')
     daemon_parser.set_defaults(func=daemon)
     daemon_parser.add_argument(
-        '--dns-port', required=False, default=53, type=int,
+        '--dns-port', required=False, default=53, type=positive_int,
         help="port for DNS server to listen on")
+    daemon_parser.add_argument(
+        '--sync-interval', required=False, default=5 * 60, type=positive_int,
+        help="time in seconds between ONE syncs")
 
     shell_parser = subparsers.add_parser('shell')
     shell_parser.set_defaults(func=shell)

onedns/resolver.py

@@ -99,10 +99,10 @@ class DynamicResolver(server.BaseResolver):
                 srv.server.socket.close()
 
     def daemon(self, *args, **kwargs):
-        testing = kwargs.pop('testing', False)
+        test = kwargs.pop('test', False)
         if self._udp_server is None or not self._udp_server.isAlive():
             self.start(*args, **kwargs)
         while self._udp_server.isAlive():
             time.sleep(1)
-            if testing:
+            if test:
                 break

onedns/server.py

@@ -1,4 +1,5 @@
 import re
+import time
 
 from onedns import zone
 from onedns import resolver
@@ -88,3 +89,17 @@ class OneDNS(resolver.DynamicResolver):
             except exception.DuplicateVMError as e:
                 e.log(warn=True)
         self.load(z)
+
+    def daemon(self, *args, **kwargs):
+        test = kwargs.pop('test', False)
+        test_vms = kwargs.pop('test_vms', None)
+        sync_interval = kwargs.pop('sync_interval', 5 * 60)
+        self.sync(vms=test_vms)
+        if self._udp_server is None or not self._udp_server.isAlive():
+            self.start(*args, **kwargs)
+        time.sleep(sync_interval)
+        while self._udp_server.isAlive():
+            self.sync(vms=test_vms)
+            time.sleep(sync_interval)
+            if test:
+                break

onedns/tests/test_cli.py

@@ -13,12 +13,24 @@ def test_cli_help():
 
 @mock.patch.object(cli, 'logger', mock.MagicMock())
 def test_cli_subcmd_daemon(vms):
-    cli.main(args=['daemon'], testing=True, vms=vms)
+    cli.main(args='daemon --dns-port 9053 --sync-interval 1'.split(),
+             test=True, test_vms=vms)
 
 
 @mock.patch.dict('sys.modules', test_shell.IPY_MODULES)
 @mock.patch.object(cli, 'logger', mock.MagicMock())
 def test_cli_subcmd_shell():
     test_shell.IPY.embed.reset_mock()
-    cli.main(args=['shell'], testing=True)
+    cli.main(args=['shell'], test=True)
     test_shell.IPY.embed.assert_called_once()
+
+
+def test_invalid_values():
+    with pytest.raises(SystemExit):
+        cli.main(args='daemon --dns-port asdf'.split())
+    with pytest.raises(SystemExit):
+        cli.main(args='daemon --dns-port 0'.split())
+    with pytest.raises(SystemExit):
+        cli.main(args='daemon --sync-interval asdf'.split())
+    with pytest.raises(SystemExit):
+        cli.main(args='daemon --sync-interval 0'.split())

onedns/tests/test_dynamicresolver.py

@@ -36,7 +36,7 @@ def test_nxdomain(dns):
 def test_daemon(dns):
     dns.close()
     dns.daemon(dns_address=conftest.INTERFACE, dns_port=conftest.PORT,
-               tcp=True, testing=True)
+               tcp=True, test=True)
 
 
 @pytest.mark.parametrize("qname,qtype,output", conftest.TEST_LOOKUP_DATA)