Add initial place for Salt Service Discovery Protocol

salt/utils/ssdp.py

@@ -0,0 +1,46 @@
+# -*- coding: utf-8 -*-
+#
+# Author: Bo Maryniuk <bo@suse.de>
+#
+# Copyright 2017 SUSE LLC
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+'''
+Salt Service Discovery Protocol.
+JSON-based service discovery protocol, used by minions to find running Master.
+'''
+
+import logging
+try:
+    import asyncio
+except ImportError:
+    try:
+        # Python 2 doesn't have asyncio
+        import trollius as asyncio
+    except ImportError:
+        asyncio = None
+
+
+class SSDPBase(object):
+    '''
+    Salt Service Discovery Protocol.
+    '''
+    log = logging.getLogger(__name__)
+
+    @staticmethod
+    def is_available():
+        '''
+        Return True if the USSDP dependencies are satisfied.
+        :return:
+        '''
+        return bool(asyncio)