Add a new open vswitch plugin

This plugin allows to add, delete and dump openflow rules for a given
bridge.

Signed-off-by: Guillaume <[email protected]>

Author: gthvn1

Diff for: README.md

@@ -338,6 +338,32 @@ Restart a service only if it is already running.
 $ xe host-call-plugin host-uuid<uuid> plugin=service.py fn=try_restart_service args:service=<service>
 ```
 
+
+### `open-vswitch`
+
+Add, delete and dump openflow rules.
+
+
+```
+$ xe host-call-plugin host-uuid<uuid> plugin=open-vswitch.py \
+  fn=add-flow \
+  args:bridge=xenbr0 \
+  args:rule="ip,in_port=1,dl_src=5e:f3:5b:e6:7b:f3,nw_dst=10.10.10.0/24 actions=drop"
+```
+
+```
+$ xe host-call-plugin host-uuid<uuid> plugin=open-vswitch.py \
+  fn=del-flows \
+  args:bridge=xenbr0 \
+  args:rule="ip,in_port=1,dl_src=5e:f3:5b:e6:7b:f3,nw_dst=10.10.10.0/24"
+```
+
+```
+$ xe host-call-plugin host-uuid<uuid> plugin=open-vswitch.py \
+  fn=dump-flows \
+  args:bridge=xenbr0
+```
+
 ## Tests
 
 To run the plugins' unit tests you'll need to install `pytest`, `pyfakefs` and `mock`.

Diff for: SOURCES/etc/xapi.d/plugins/open-vswitch.py

@@ -0,0 +1,37 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+import json
+
+import XenAPIPlugin
+
+from xcpngutils import configure_logging, error_wrapped
+
+
+@error_wrapped
+def add_flow(_session, args):
+    _LOGGER.info("Calling add_flow with args {}".format(args))
+    return json.dumps(True)
+
+
+@error_wrapped
+def del_flows(_session, args):
+    _LOGGER.info("Calling del_flows with args {}".format(args))
+    return json.dumps(True)
+
+
+@error_wrapped
+def dump_flows(session, args):
+    _LOGGER.info("Calling check with args {}".format(args))
+    return json.dumps(True)
+
+
+_LOGGER = configure_logging("ovs")
+if __name__ == "__main__":
+    XenAPIPlugin.dispatch(
+        {
+            "add-flow": add_flow,
+            "del-flows": del_flows,
+            "dump-flows": dump_flows,
+        }
+    )