Add OSM charms

Change-Id: Iec1c915c77ac24080bfc8813eecc1970ee8c0213
Signed-off-by: David Garcia <david.garcia@canonical.com>
diff --git a/installers/charm/interfaces/osm-nbi/provides.py b/installers/charm/interfaces/osm-nbi/provides.py
new file mode 100644
index 0000000..7ff3199
--- /dev/null
+++ b/installers/charm/interfaces/osm-nbi/provides.py
@@ -0,0 +1,44 @@
+#!/usr/bin/python
+# Copyright 2020 Canonical Ltd.
+#
+# 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.
+
+from charms.reactive import RelationBase
+from charms.reactive import hook
+from charms.reactive import scopes
+
+
+class OsmNBIProvides(RelationBase):
+    scope = scopes.GLOBAL
+
+    @hook("{provides:osm-nbi}-relation-joined")
+    def joined(self):
+        self.set_state("{relation_name}.joined")
+
+    @hook("{provides:osm-nbi}-relation-changed")
+    def changed(self):
+        self.set_state("{relation_name}.ready")
+
+    @hook("{provides:osm-nbi}-relation-{broken,departed}")
+    def broken_departed(self):
+        self.remove_state("{relation_name}.ready")
+        self.remove_state("{relation_name}.joined")
+
+    @hook("{provides:osm-nbi}-relation-broken")
+    def broken(self):
+        self.set_state("{relation_name}.removed")
+
+    def send_connection(self, host, port=9999):
+        conv = self.conversation()
+        conv.set_remote("host", host)
+        conv.set_remote("port", port)