From 9d592fe3709b23451df24429080e75159241a8b8 Mon Sep 17 00:00:00 2001
From: Fabio Manganiello <blacklight86@gmail.com>
Date: Wed, 8 Jan 2020 14:55:58 +0100
Subject: [PATCH] Added battery sensor backend

---
 platypush/backend/sensor/battery.py           | 30 +++++++++++++++++++
 platypush/message/response/system/__init__.py |  4 +--
 platypush/plugins/system/__init__.py          |  2 +-
 3 files changed, 33 insertions(+), 3 deletions(-)
 create mode 100644 platypush/backend/sensor/battery.py

diff --git a/platypush/backend/sensor/battery.py b/platypush/backend/sensor/battery.py
new file mode 100644
index 000000000..aa40cac30
--- /dev/null
+++ b/platypush/backend/sensor/battery.py
@@ -0,0 +1,30 @@
+from platypush.backend.sensor import SensorBackend
+from platypush.context import get_plugin
+
+
+class SensorBatteryBackend(SensorBackend):
+    """
+    This backend listens for battery full/connect/disconnect/below/above threshold events.
+    The sensor events triggered by this backend will include any of the following fields:
+
+        - ``battery_percent``
+        - ``battery_secs_left``
+        - ``battery_power_plugged``
+
+    Requires:
+
+        - **psutil** (``pip install psutil``) for CPU load and stats.
+    """
+
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+
+    def get_measurement(self):
+        plugin = get_plugin('system')
+        return {
+            'battery_' + name: value
+            for name, value in plugin.sensors_battery().output.items()
+        }
+
+
+# vim:sw=4:ts=4:et:
diff --git a/platypush/message/response/system/__init__.py b/platypush/message/response/system/__init__.py
index 3061aa323..96c896160 100644
--- a/platypush/message/response/system/__init__.py
+++ b/platypush/message/response/system/__init__.py
@@ -384,13 +384,13 @@ class SensorFanResponse(SensorResponse):
 class SensorBatteryResponse(SensorResponse):
     def __init__(self,
                  percent: float,
-                 secsleft: int,
+                 secs_left: int,
                  power_plugged: bool,
                  *args, **kwargs):
         super().__init__(
             *args, output={
                 'percent': percent,
-                'secsleft': secsleft,
+                'secs_left': secs_left,
                 'power_plugged': power_plugged,
             }, **kwargs
         )
diff --git a/platypush/plugins/system/__init__.py b/platypush/plugins/system/__init__.py
index 5046a805c..2504fec4a 100644
--- a/platypush/plugins/system/__init__.py
+++ b/platypush/plugins/system/__init__.py
@@ -544,7 +544,7 @@ class SystemPlugin(Plugin):
 
         return SensorBatteryResponse(
             percent=stats.percent,
-            secsleft=stats.secsleft,
+            secs_left=stats.secsleft,
             power_plugged=stats.power_plugged,
         )