'NoneType' object has no attribute 'uri'

[james beedy]

I seem to be hitting this every ~1/5 deploys.

2017-02-21 00:12:17 INFO db-relation-joined Traceback (most recent call last):
2017-02-21 00:12:17 INFO db-relation-joined File "/var/lib/juju/agents/unit-feed-web-5/charm/hooks/db-relation-joined", line 19, in <module>
2017-02-21 00:12:17 INFO db-relation-joined main()
2017-02-21 00:12:17 INFO db-relation-joined File "/usr/local/lib/python3.5/dist-packages/charms/reactive/__init__.py", line 78, in main
2017-02-21 00:12:17 INFO db-relation-joined bus.dispatch()
2017-02-21 00:12:17 INFO db-relation-joined File "/usr/local/lib/python3.5/dist-packages/charms/reactive/bus.py", line 434, in dispatch
2017-02-21 00:12:17 INFO db-relation-joined _invoke(other_handlers)
2017-02-21 00:12:17 INFO db-relation-joined File "/usr/local/lib/python3.5/dist-packages/charms/reactive/bus.py", line 417, in _invoke
2017-02-21 00:12:17 INFO db-relation-joined handler.invoke()
2017-02-21 00:12:17 INFO db-relation-joined File "/usr/local/lib/python3.5/dist-packages/charms/reactive/bus.py", line 291, in invoke
2017-02-21 00:12:17 INFO db-relation-joined self._action(*args)
2017-02-21 00:12:17 INFO db-relation-joined File "/var/lib/juju/agents/unit-feed-web-5/charm/reactive/feed_base.py", line 172, in get_set_feeddb_data
2017-02-21 00:12:17 INFO db-relation-joined uri_vars = {'uri': pgsql.master.uri,
2017-02-21 00:12:17 INFO db-relation-joined AttributeError: 'NoneType' object has no attribute 'uri'
2017-02-21 00:12:17 ERROR juju.worker.uniter.operation runhook.go:107 hook "db-relation-joined" failed: exit status 1

[james beedy (jamesbeedy)]

Seem to be hitting this for pgsql.master.host in ~(1/5) deploys too.

2017-02-21 02:06:41 INFO feeddb-relation-changed Traceback (most recent call last):
2017-02-21 02:06:41 INFO feeddb-relation-changed File "/var/lib/juju/agents/unit-copy1-0/charm/hooks/feeddb-relation-changed", line 19, in <module>
2017-02-21 02:06:41 INFO feeddb-relation-changed main()
2017-02-21 02:06:41 INFO feeddb-relation-changed File "/usr/local/lib/python3.5/dist-packages/charms/reactive/__init__.py", line 78, in main
2017-02-21 02:06:41 INFO feeddb-relation-changed bus.dispatch()
2017-02-21 02:06:41 INFO feeddb-relation-changed File "/usr/local/lib/python3.5/dist-packages/charms/reactive/bus.py", line 434, in dispatch
2017-02-21 02:06:41 INFO feeddb-relation-changed _invoke(other_handlers)
2017-02-21 02:06:41 INFO feeddb-relation-changed File "/usr/local/lib/python3.5/dist-packages/charms/reactive/bus.py", line 417, in _invoke
2017-02-21 02:06:41 INFO feeddb-relation-changed handler.invoke()
2017-02-21 02:06:41 INFO feeddb-relation-changed File "/usr/local/lib/python3.5/dist-packages/charms/reactive/bus.py", line 291, in invoke
2017-02-21 02:06:41 INFO feeddb-relation-changed self._action(*args)
2017-02-21 02:06:41 INFO feeddb-relation-changed File "/var/lib/juju/agents/unit-copy1-0/charm/reactive/copy.py", line 151, in get_set_feed_db_data
2017-02-21 02:06:41 INFO feeddb-relation-changed **{'host': pgsql.master.host,
2017-02-21 02:06:41 INFO feeddb-relation-changed AttributeError: 'NoneType' object has no attribute 'host'
2017-02-21 02:06:41 ERROR juju.worker.uniter.operation runhook.go:107 hook "feeddb-relation-changed" failed: exit status 1

[james beedy (jamesbeedy)]

As can be seen here -> http://paste.ubuntu.com/24037759/, copy1 has the error above, while copy2 deployed successfully (copy2 didn't hit the error).

[Stuart Bishop (stub)]

The various set_*() methods need to remove the *.available states if the value has changed.