The main application class has been moved from __init__ to the app
module.
__init__ will contain instead the relevant global variables and the
modules and objects exposed to external integrations - such as
`get_plugin` and `get_backend`, or the `main` itself.
This will make future integrations much easier - the global __init__
doesn't contain any business logic now, it can import anything without
fearing circular dependencies, and it can limit its exposed objects to
those that we want to expose to 3rd-party integrations and scripts.
It will also make it easier to extend the main entry point with
additional logic - such as a supervisor or an embedded Redis server.
There are situations where you may not want to run the HTTP server in a
full blown WSGI-over-Tornado container - unit/integration tests and
embedded single-core devices are among those cases.
In those scenarios, we should allow the user to be able to run the
backend using the built-in Werkzeug server provided by Flask.
- Support for nested attributes on event hook conditions. Things like
these are now possible:
```
from platypush.event.hook import hook
from platypush.message.event.entities import EntityUpdateEvent
@hook(EntityUpdateEvent, entity={"external_id": "system:cpu"})
def on_cpu_update_event(event: EntityUpdateEvent, **_):
print(event.args["entity"]["percent"])
```
- The scoring/regex extraction/partial string match logic in
`_matches_argument` is actually only needed for
`SpeechRecognizedEvent`. Other events don't need these features, and
event hooks may be actually triggered unexpectedly in case of partial
matches. Therefore, the "complex" `_matches_argument` has been moved
as an override only for `SpeechRecognizedEvent`, and all the other
events will perform simple key-value matching.
The cron scheduler has been made more robust against changes in the
system clock (caused by e.g. DST changes, NTP syncs or manual setting).
A more granular management for cronjob events has been introduced, now
supporting a `TIME_SYNC` event besides the usual `STOP`. When the cron
scheduler detects a system clock drift (i.e. the timestamp offset before
and after a blocking wait is >1 sec) then all the cronjobs are notified
and forced to refresh their state.
