Optimize template 2 (#3521)

* Enforce compiling templates

* Refactor templates

* Add template validator to Logbook service

* Some more fixes

* Lint

* Allow easy skipping of rfxtrx tests

* Fix template bug in AND & OR conditions

* add entities extractor

Conflicts:
	tests/helpers/test_template.py

* fix unittest

* Convert template to be async

* Fix Farcy

* Lint fix

* Limit template updates to related entities

* Make template automation async

homeassistant/helpers/config_validation.py

@@ -6,7 +6,6 @@ from urllib.parse import urlparse
 
 from typing import Any, Union, TypeVar, Callable, Sequence, Dict
 
-import jinja2
 import voluptuous as vol
 
 from homeassistant.loader import get_platform
@@ -16,8 +15,10 @@ from homeassistant.const import (
     CONF_CONDITION, CONF_BELOW, CONF_ABOVE, SUN_EVENT_SUNSET,
     SUN_EVENT_SUNRISE, CONF_UNIT_SYSTEM_IMPERIAL, CONF_UNIT_SYSTEM_METRIC)
 from homeassistant.core import valid_entity_id
+from homeassistant.exceptions import TemplateError
 import homeassistant.util.dt as dt_util
 from homeassistant.util import slugify
+from homeassistant.helpers import template as template_helper
 
 # pylint: disable=invalid-name
 
@@ -103,6 +104,11 @@ def entity_ids(value: Union[str, Sequence]) -> Sequence[str]:
     return [entity_id(ent_id) for ent_id in value]
 
 
+def enum(enumClass):
+    """Create validator for specified enum."""
+    return vol.All(vol.In(enumClass.__members__), enumClass.__getitem__)
+
+
 def icon(value):
     """Validate icon."""
     value = str(value)
@@ -234,14 +240,15 @@ def template(value):
     """Validate a jinja2 template."""
     if value is None:
         raise vol.Invalid('template value is None')
-    if isinstance(value, (list, dict)):
+    elif isinstance(value, (list, dict, template_helper.Template)):
         raise vol.Invalid('template value should be a string')
 
-    value = str(value)
+    value = template_helper.Template(str(value))
+
     try:
-        jinja2.Environment().parse(value)
+        value.ensure_valid()
         return value
-    except jinja2.exceptions.TemplateSyntaxError as ex:
+    except TemplateError as ex:
         raise vol.Invalid('invalid template ({})'.format(ex))