Updated examples to use juju.loop

[osm/N2VC.git] / examples / relate.py

diff --git a/examples/relate.py b/examples/relate.py
index 288d58f..8f1e708 100644 (file)
--- a/examples/relate.py
+++ b/examples/relate.py
@@ -11,45 +11,88 @@ import asyncio
 import logging
 
 from juju.model import Model, ModelObserver
+from juju import loop
+
+
+class MyRemoveObserver(ModelObserver):
+    async def on_change(self, delta, old, new, model):
+        if delta.type == 'remove':
+            assert(new.latest() == new)
+            assert(new.next() is None)
+            assert(new.dead)
+            assert(new.current)
+            assert(new.connected)
+            assert(new.previous().dead)
+            assert(not new.previous().current)
+            assert(not new.previous().connected)
 
 
 class MyModelObserver(ModelObserver):
+    _shutting_down = False
+
     async def on_change(self, delta, old, new, model):
-        if model.all_units_idle():
+        if model.units and model.all_units_idle() and not self._shutting_down:
+            self._shutting_down = True
             logging.debug('All units idle, disconnecting')
+            await model.reset(force=True)
             await model.disconnect()
-            model.loop.stop()
 
 
-async def run():
+async def main():
     model = Model()
     await model.connect_current()
 
+    model.add_observer(MyRemoveObserver())
     await model.reset(force=True)
     model.add_observer(MyModelObserver())
 
-    await model.deploy(
-        'ubuntu-0',
-        service_name='ubuntu',
+    ubuntu_app = await model.deploy(
+        'ubuntu',
+        application_name='ubuntu',
         series='trusty',
         channel='stable',
     )
+    ubuntu_app.on_change(asyncio.coroutine(
+        lambda delta, old_app, new_app, model:
+            print('App changed: {}'.format(new_app.entity_id))
+    ))
+    ubuntu_app.on_remove(asyncio.coroutine(
+        lambda delta, old_app, new_app, model:
+            print('App removed: {}'.format(old_app.entity_id))
+    ))
+    ubuntu_app.on_unit_add(asyncio.coroutine(
+        lambda delta, old_unit, new_unit, model:
+            print('Unit added: {}'.format(new_unit.entity_id))
+    ))
+    ubuntu_app.on_unit_remove(asyncio.coroutine(
+        lambda delta, old_unit, new_unit, model:
+            print('Unit removed: {}'.format(old_unit.entity_id))
+    ))
+    unit_a, unit_b = await ubuntu_app.add_units(count=2)
+    unit_a.on_change(asyncio.coroutine(
+        lambda delta, old_unit, new_unit, model:
+            print('Unit changed: {}'.format(new_unit.entity_id))
+    ))
     await model.deploy(
-        'nrpe-11',
-        service_name='nrpe',
+        'nrpe',
+        application_name='nrpe',
         series='trusty',
         channel='stable',
+        # subordinates must be deployed without units
         num_units=0,
     )
-    await model.add_relation(
+    my_relation = await model.add_relation(
         'ubuntu',
         'nrpe',
     )
+    my_relation.on_remove(asyncio.coroutine(
+        lambda delta, old_rel, new_rel, model:
+            print('Relation removed: {}'.format(old_rel.endpoints))
+    ))
+
 
-logging.basicConfig(level=logging.DEBUG)
-ws_logger = logging.getLogger('websockets.protocol')
-ws_logger.setLevel(logging.INFO)
-loop = asyncio.get_event_loop()
-loop.set_debug(False)
-loop.create_task(run())
-loop.run_forever()
+if __name__ == '__main__':
+    logging.basicConfig(level=logging.DEBUG)
+    ws_logger = logging.getLogger('websockets.protocol')
+    ws_logger.setLevel(logging.INFO)
+    loop.run(main())