From e6bfa1c50f751696f217d1f8be5716cffd7089ec Mon Sep 17 00:00:00 2001
From: Fabio Manganiello <info@fabiomanganiello.com>
Date: Wed, 13 Apr 2022 11:25:14 +0200
Subject: [PATCH] Better dynamic entities discovery

---
 .../src/components/panels/Entities/Index.vue  | 55 +++++++------------
 platypush/entities/_engine.py                 | 19 +++++++
 platypush/entities/devices.py                 |  2 +-
 platypush/entities/lights.py                  |  2 +-
 platypush/entities/switches.py                |  2 +-
 5 files changed, 43 insertions(+), 37 deletions(-)

diff --git a/platypush/backend/http/webapp/src/components/panels/Entities/Index.vue b/platypush/backend/http/webapp/src/components/panels/Entities/Index.vue
index 4b82501ae..e72ea268b 100644
--- a/platypush/backend/http/webapp/src/components/panels/Entities/Index.vue
+++ b/platypush/backend/http/webapp/src/components/panels/Entities/Index.vue
@@ -143,44 +143,30 @@ export default {
     },
 
     async refresh() {
-      const actions = Object.keys(
-          Object.values(this.selector.selectedEntities).reduce((obj, entity) => {
-            if (entity.plugin)
-              obj[entity.plugin] = true
-              return obj
-          }, {})
-      ).map((plugin) => `${plugin}.status`)
+      this.loadingEntities = Object.entries(this.entities).reduce((obj, [id, entity]) => {
+          const self = this
+          if (this.entityTimeouts[id])
+            clearTimeout(this.entityTimeouts[id])
 
-      this.loadingEntities = {
-        ...this.loadingEntities,
-        ...Object.keys(this.selector.selectedEntities).reduce((obj, id) => {
-            const self = this
-            const entity = this.entities[id]
+          this.entityTimeouts[id] = setTimeout(() => {
+              if (self.loadingEntities[id])
+                delete self.loadingEntities[id]
+              if (self.entityTimeouts[id])
+                delete self.entityTimeouts[id]
 
-            if (this.entityTimeouts[id])
-              clearTimeout(this.entityTimeouts[id])
+              self.errorEntities[id] = entity
+              self.notify({
+                error: true,
+                title: entity.plugin,
+                text: `Scan timeout for ${entity.name}`,
+              })
+          }, this.entityScanTimeout * 1000)
 
-            this.entityTimeouts[id] = setTimeout(() => {
-                if (self.loadingEntities[id])
-                  delete self.loadingEntities[id]
-                if (self.entityTimeouts[id])
-                  delete self.entityTimeouts[id]
+          obj[id] = true
+          return obj
+      }, {})
 
-                self.errorEntities[id] = entity
-                self.notify({
-                  error: true,
-                  title: entity.plugin,
-                  text: `Scan timeout for ${entity.name}`,
-                })
-            }, this.entityScanTimeout * 1000)
-
-            obj[id] = true
-            return obj
-        }, {}),
-      }
-
-      // Force refresh by calling `.status` on all the selected plugins
-      await Promise.all(actions.map((act) => this.request(act)))
+      await this.request('entities.scan')
     },
 
     async sync() {
@@ -231,6 +217,7 @@ export default {
         ...event.entity,
         meta: {
           ...(this.entities[entityId]?.meta || {}),
+          ...(meta[event.entity.type] || {}),
           ...(event.entity?.meta || {}),
         },
       }
diff --git a/platypush/entities/_engine.py b/platypush/entities/_engine.py
index e7a72726f..5330e6820 100644
--- a/platypush/entities/_engine.py
+++ b/platypush/entities/_engine.py
@@ -1,3 +1,4 @@
+import json
 from logging import getLogger
 from queue import Queue, Empty
 from threading import Thread, Event, RLock
@@ -23,6 +24,7 @@ class EntitiesEngine(Thread):
         self.logger = getLogger(name=obj_name)
         self._queue = Queue()
         self._should_stop = Event()
+        self._entities_awaiting_flush = set()
         self._entities_cache_lock = RLock()
         self._entities_cache = {
             'by_id': {},
@@ -110,6 +112,16 @@ class EntitiesEngine(Thread):
         self._populate_entity_id_from_cache(entity)
         if entity.id:
             get_bus().post(EntityUpdateEvent(entity=entity))
+        else:
+            self._entities_awaiting_flush.add(self._to_entity_awaiting_flush(entity))
+
+    @staticmethod
+    def _to_entity_awaiting_flush(entity: Entity):
+        e = entity.to_json()
+        return json.dumps(
+            {k: v for k, v in e.items() if k in {'external_id', 'name', 'plugin'}},
+            sort_keys=True,
+        )
 
     def post(self, *entities: Entity):
         for entity in entities:
@@ -226,3 +238,10 @@ class EntitiesEngine(Thread):
         with self._entities_cache_lock:
             for entity in entities:
                 self._cache_entities(entity, overwrite_cache=True)
+
+        entities_awaiting_flush = {*self._entities_awaiting_flush}
+        for entity in entities:
+            e = self._to_entity_awaiting_flush(entity)
+            if e in entities_awaiting_flush:
+                self._process_event(entity)
+                self._entities_awaiting_flush.remove(e)
diff --git a/platypush/entities/devices.py b/platypush/entities/devices.py
index 24820eef9..619a22529 100644
--- a/platypush/entities/devices.py
+++ b/platypush/entities/devices.py
@@ -6,7 +6,7 @@ from ._base import Entity
 class Device(Entity):
     __tablename__ = 'device'
 
-    id = Column(Integer, ForeignKey(Entity.id), primary_key=True)
+    id = Column(Integer, ForeignKey(Entity.id, ondelete='CASCADE'), primary_key=True)
 
     __mapper_args__ = {
         'polymorphic_identity': __tablename__,
diff --git a/platypush/entities/lights.py b/platypush/entities/lights.py
index 44392aecb..b8fa26f3a 100644
--- a/platypush/entities/lights.py
+++ b/platypush/entities/lights.py
@@ -6,7 +6,7 @@ from .devices import Device
 class Light(Device):
     __tablename__ = 'light'
 
-    id = Column(Integer, ForeignKey(Device.id), primary_key=True)
+    id = Column(Integer, ForeignKey(Device.id, ondelete='CASCADE'), primary_key=True)
 
     __mapper_args__ = {
         'polymorphic_identity': __tablename__,
diff --git a/platypush/entities/switches.py b/platypush/entities/switches.py
index e7dcfbde4..3c7d6d100 100644
--- a/platypush/entities/switches.py
+++ b/platypush/entities/switches.py
@@ -6,7 +6,7 @@ from .devices import Device
 class Switch(Device):
     __tablename__ = 'switch'
 
-    id = Column(Integer, ForeignKey(Device.id), primary_key=True)
+    id = Column(Integer, ForeignKey(Device.id, ondelete='CASCADE'), primary_key=True)
     state = Column(Boolean)
 
     __mapper_args__ = {