Initial commit of interface

copyright

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+Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0
+
+Files: *
+Copyright: 2015, Canonical Ltd.
+License: GPL-3
+
+License: GPL-3
+ On Debian GNU/Linux system you can find the complete text of the
+ GPL-3 license in '/usr/share/common-licenses/GPL-3'

interface.yaml

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+name: neutron-plugin
+summary: Interface for intergrating Neutron SDN's with the nova-compute charm
+maintainer: James Page <james.page@ubuntu.com>

provides.py

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+import json
+
+from charmhelpers.core.reactive import hook
+from charmhelpers.core.reactive import RelationBase
+from charmhelpers.core.reactive import scopes
+
+
+class NeutronPluginProvides(RelationBase):
+    scope = scopes.GLOBAL
+
+    @hook('{provides:neutron-plugin}-relation-{joined,changed}')
+    def changed(self):
+        self.set_state('{relation_name}.connected')
+
+    @hook('{provides:neutron-plugin}-relation-{broken,departed}')
+    def broken(self):
+        self.remove_state('{relation_name}.connected')
+
+    def configure_plugin(self, plugin, config):
+        conversation = self.conversation()
+        relation_info = {
+            'neutron-plugin': plugin,
+            'subordinate_configuration': json.dumps(config),
+        }
+        conversation.set_remote(**relation_info)