Make percentage string values as floats/ints in InfluxDB (#7879)

* Make percentage string values as floats in InfluxDB

Currently Z-wave and other compontents report an attributes battery
level as an integer, for example

```yaml
{
"is_awake": false,
"battery_level": 61,
}
```

However, some other components like Vera add the battery level as a
string

```yaml
{
"Vera Device Id": 25,
"device_armed": "False",
"battery_level": "63%",
"device_tripped": "False",
}
```

By removing any % signs in the field, this will send the value to
InfluxDB as an int, which can then be used to plot the data in graphs
correctly, like other percentage fields.

* Add tests and remove all trailing non digits

Adds tests and now removes all trailing non-numeric characters for
better use

* Update variable name for InfluxDB digit checks

Updates the variable used for the regex to remove trailing non digits

* Fix linting errors for InfluxDB component

Fixes a small linting error on the InfluxDB component

homeassistant/components/influxdb.py

@@ -6,6 +6,8 @@ https://home-assistant.io/components/influxdb/
 """
 import logging
 
+import re
+
 import voluptuous as vol
 
 from homeassistant.const import (
@@ -147,6 +149,8 @@ def setup(hass, config):
             }
         ]
 
+        non_digit_tail = re.compile(r'[\d.]+')
+        non_decimal = re.compile(r'[^\d.]+')
         for key, value in state.attributes.items():
             if key != 'unit_of_measurement':
                 # If the key is already in fields
@@ -161,6 +165,9 @@ def setup(hass, config):
                 except (ValueError, TypeError):
                     new_key = "{}_str".format(key)
                     json_body[0]['fields'][new_key] = str(value)
+                    if non_digit_tail.match(json_body[0]['fields'][new_key]):
+                        json_body[0]['fields'][key] = float(
+                            non_decimal.sub('', value))
 
         json_body[0]['tags'].update(tags)
 

tests/components/test_influxdb.py

@@ -120,7 +120,10 @@ class TestInfluxDB(unittest.TestCase):
             attrs = {
                 'unit_of_measurement': 'foobars',
                 'longitude': '1.1',
-                'latitude': '2.2'
+                'latitude': '2.2',
+                'battery_level': '99%',
+                'temperature': '20c',
+                'last_seen': 'Last seen 23 minutes ago'
             }
             state = mock.MagicMock(
                 state=in_, domain='fake', object_id='entity', attributes=attrs)
@@ -136,7 +139,12 @@ class TestInfluxDB(unittest.TestCase):
                     'fields': {
                         'state': out,
                         'longitude': 1.1,
-                        'latitude': 2.2
+                        'latitude': 2.2,
+                        'battery_level_str': '99%',
+                        'battery_level': 99.0,
+                        'temperature_str': '20c',
+                        'temperature': 20.0,
+                        'last_seen_str': 'Last seen 23 minutes ago'
                     },
                 }]
 
@@ -151,7 +159,12 @@ class TestInfluxDB(unittest.TestCase):
                     'fields': {
                         'value': out,
                         'longitude': 1.1,
-                        'latitude': 2.2
+                        'latitude': 2.2,
+                        'battery_level_str': '99%',
+                        'battery_level': 99.0,
+                        'temperature_str': '20c',
+                        'temperature': 20.0,
+                        'last_seen_str': 'Last seen 23 minutes ago'
                     },
                 }]
             self.handler_method(event)