Fixed backend.zwave event logic dispatch for recent versions of ZWaveJS.

ZWaveJS has broken back-compatibility with zwavejs2mqtt when it comes to
events format.

Only a partial representation of the node and value objects is
forwarded, and that's often not sufficient to infer the full state of
the node with its values.

The `_dispatch_event` logic has therefore been modified to accommodate
both the implementation.

This means that we have to go conservative in order to preserve
back-compatibility and not over-complicate things, even if it (slightly)
comes at the expense of performance.
This commit is contained in:
Fabio Manganiello 2022-12-10 14:52:10 +01:00
parent 00fca6b187
commit 313105f014
Signed by untrusted user: blacklight
GPG key ID: D90FBA7F76362774

View file

@ -104,60 +104,75 @@ class ZwaveMqttBackend(MqttBackend):
def _dispatch_event(
self,
event_type: Type[ZwaveEvent],
node: Optional[dict] = None,
node: dict,
value: Optional[dict] = None,
**kwargs,
):
if node and value and 'id' not in value:
value_id = f"{value['commandClass']}-{value.get('endpoint', 0)}-{value['property']}"
if 'propertyKey' in value:
value_id += '-' + str(value['propertyKey'])
node_id = node.get('id')
assert node_id is not None, 'No node ID specified'
if value_id not in node.get('values', {}):
self.logger.warning(
f'value_id {value_id} not found on node {node["id"]}'
)
# This is far from efficient (we are querying the latest version of the whole
# node for every event we receive), but this is the best we can do with recent
# versions of ZWaveJS that only transmit partial representations of the node and
# the value. The alternative would be to come up with a complex logic for merging
# cached and new values, with the risk of breaking back-compatibility with earlier
# implementations of zwavejs2mqtt.
node = kwargs['node'] = self.plugin.get_nodes(node_id).output # type: ignore
node_values = node.get('values', {})
if node and value:
# Infer the value_id structure if it's not provided on the event
value_id = value.get('id')
if value_id is None:
value_id = f"{value['commandClass']}-{value.get('endpoint', 0)}-{value['property']}"
if 'propertyKey' in value:
value_id += '-' + str(value['propertyKey'])
# Prepend the node_id to value_id if it's not available in node['values']
# (compatibility with more recent versions of ZwaveJS that don't provide
# the value_id on the events)
if value_id not in node_values:
value_id = f"{node_id}-{value_id}"
if value_id not in node_values:
self.logger.warning(f'value_id {value_id} not found on node {node_id}')
return
value = node['values'][value_id]
value = kwargs['value'] = node_values[value_id]
if value:
kwargs['value'] = self.plugin.value_to_dict(value)
if node:
kwargs['node'] = self.plugin.node_to_dict(node)
node_id = kwargs['node']['node_id']
if event_type == ZwaveNodeEvent:
if node_id not in self._nodes:
event_type = ZwaveNodeAddedEvent
elif kwargs['node']['name'] != self._nodes[node_id]['name']:
event_type = ZwaveNodeRenamedEvent
if event_type == ZwaveNodeEvent:
# If this node_id wasn't cached before, then it's a new node
if node_id not in self._nodes:
event_type = ZwaveNodeAddedEvent
# If the name has changed, we have a rename event
elif node['name'] != self._nodes[node_id]['name']:
event_type = ZwaveNodeRenamedEvent
if event_type == ZwaveNodeRemovedEvent:
self._nodes.pop(node_id, None)
else:
self._nodes[node_id] = kwargs['node']
self._nodes[node_id] = node
evt = event_type(**kwargs)
self._events_queue.put(evt)
if event_type == ZwaveValueChangedEvent:
if value and event_type == ZwaveValueChangedEvent:
value = value.copy()
# zwavejs2mqtt currently treats some values (e.g. binary switches) in an inconsistent way,
# using two values - a read-only value called currentValue that gets updated on the
# node_value_updated topic, and a writable value called targetValue that doesn't get updated
# (see https://github.com/zwave-js/zwavejs2mqtt/blob/4a6a5c5f1274763fd3aced4cae2c72ea060716b5 \
# /docs/guide/migrating.md).
# To properly manage updates on writable values, propagate an event for both.
if kwargs.get('value', {}).get('property_id') == 'currentValue':
value = kwargs['value'].copy()
if value.get('property_id') == 'currentValue':
target_value_id = (
f'{kwargs["node"]["node_id"]}-{value["command_class"]}-{value.get("endpoint", 0)}'
f'{node_id}-{value["command_class"]}-{value.get("endpoint", 0)}'
f'-targetValue'
)
kwargs['value'] = kwargs['node'].get('values', {}).get(target_value_id)
target_value = node_values.get(target_value_id)
if kwargs['value']:
if target_value:
kwargs['value']['data'] = value['data']
kwargs['node']['values'][target_value_id] = kwargs['value']
evt = event_type(**kwargs)
@ -201,7 +216,6 @@ class ZwaveMqttBackend(MqttBackend):
def run(self):
super().run()
self.logger.debug('Refreshing Z-Wave nodes')
# noinspection PyUnresolvedReferences
self._nodes = self.plugin.get_nodes().output
while not self.should_stop():