X-Git-Url: https://osm.etsi.org/gitweb/?a=blobdiff_plain;f=juju%2Funit.py;h=cad4bb7ac9cf6f0398affc71f32d294ffe0c5c9f;hb=f70f1d38723997c6f35750f5d2d17fe1b74ba40d;hp=0757aa7fe9b41d826445349ff448d0f862bdb3df;hpb=e4ea3bdb0b15198bc25fea8d1e57eb2c0e014727;p=osm%2FN2VC.git

diff --git a/juju/unit.py b/juju/unit.py
index 0757aa7..cad4bb7 100644
--- a/juju/unit.py
+++ b/juju/unit.py
@@ -1,4 +1,3 @@
-import asyncio
 import logging
 from datetime import datetime
 
@@ -57,6 +56,10 @@ class Unit(model.ModelEntity):
         """
         return self.data['workload-status']['message']
 
+    @property
+    def tag(self):
+        return 'unit-%s' % self.name.replace('/', '-')
+
     def add_storage(self, name, constraints=None):
         """Add unit storage dynamically.
 
@@ -128,14 +131,39 @@ class Unit(model.ModelEntity):
         )
         return await self.model.wait_for_action(res.results[0].action.tag)
 
-    def run_action(self, action_name, **params):
-        """Run action on this unit.
+    async def run_action(self, action_name, **params):
+        """Run an action on this unit.
 
         :param str action_name: Name of action to run
         :param \*\*params: Action parameters
-
-        """
-        pass
+        :returns: An `juju.action.Action` instance.
+
+        Note that this only enqueues the action.  You will need to call
+        ``action.wait()`` on the resulting `Action` instance if you wish
+        to block until the action is complete.
+        """
+        action_facade = client.ActionFacade()
+        action_facade.connect(self.connection)
+
+        log.debug('Starting action `%s` on %s', action_name, self.name)
+
+        res = await action_facade.Enqueue([client.Action(
+            name=action_name,
+            parameters=params,
+            receiver=self.tag,
+        )])
+        action = res.results[0].action
+        error = res.results[0].error
+        if error and error.code == 'not found':
+            raise ValueError('Action `%s` not found on %s' % (action_name,
+                                                              self.name))
+        elif error:
+            raise Exception('Unknown action error: %s' % error.serialize())
+        action_id = action.tag[len('action-'):]
+        log.debug('Action started as %s', action_id)
+        # we mustn't use wait_for_action because that blocks until the
+        # action is complete, rather than just being in the model
+        return await self.model._wait_for_new('action', action_id)
 
     def scp(
             self, source_path, user=None, destination_path=None, proxy=False,
@@ -199,5 +227,24 @@ class Unit(model.ModelEntity):
 
         status = await c.FullStatus(None)
 
-        return status.applications[app]['units'][self.name].get(
-            'leader', False)
+        # FullStatus may be more up to date than our model, and the
+        # unit may have gone away, or we may be doing something silly,
+        # like trying to fetch leadership for a subordinate, which
+        # will not be filed where we expect in the model. In those
+        # cases, we may simply return False, as a nonexistent or
+        # subordinate unit is not a leader.
+        if not status.applications.get(app):
+            return False
+
+        if not status.applications[app].get('units'):
+            return False
+
+        if not status.applications[app]['units'].get(self.name):
+            return False
+
+        return status.applications[app]['units'][self.name].get('leader', False)
+
+
+    async def get_metrics(self):
+        metrics = await self.model.get_metrics(self.tag)
+        return metrics[self.name]