Convert translation helper to use async_get_integration (#23054)

* Convert translation helper to use async_get_integration

* Simplify after comments

* Lint

* Fix typing

* Typo

homeassistant/helpers/translation.py

@@ -1,10 +1,9 @@
 """Translation string lookup helpers."""
 import logging
-import pathlib
-from typing import Any, Dict, Iterable
+from typing import Any, Dict, Iterable, Optional
 
 from homeassistant import config_entries
-from homeassistant.loader import get_component, get_platform, bind_hass
+from homeassistant.loader import async_get_integration, bind_hass
 from homeassistant.util.json import load_json
 from .typing import HomeAssistantType
 
@@ -30,53 +29,38 @@ def flatten(data: Dict) -> Dict[str, Any]:
     return recursive_flatten('', data)
 
 
-def component_translation_file(hass: HomeAssistantType, component: str,
-                               language: str) -> str:
+async def component_translation_file(hass: HomeAssistantType, component: str,
+                                     language: str) -> Optional[str]:
     """Return the translation json file location for a component.
 
-    For component one of:
-     - components/light/.translations/nl.json
-     - components/.translations/group.nl.json
+    For component:
+     - components/hue/.translations/nl.json
 
-    For platform one of:
-     - components/light/.translations/hue.nl.json
+    For platform:
      - components/hue/.translations/light.nl.json
+
+    If component is just a single file, will return None.
     """
-    is_platform = '.' in component
+    parts = component.split('.')
+    domain = parts[-1]
+    is_platform = len(parts) == 2
 
-    if not is_platform:
-        module = get_component(hass, component)
-        assert module is not None
+    integration = await async_get_integration(hass, domain)
+    assert integration is not None, domain
 
-        module_path = pathlib.Path(module.__file__)
-
-        if module.__name__ == module.__package__:
-            # light/__init__.py
-            filename = '{}.json'.format(language)
-        else:
-            # group.py
-            filename = '{}.{}.json'.format(component, language)
-
-        return str(module_path.parent / '.translations' / filename)
-
-    # It's a platform
-    parts = component.split('.', 1)
-    module = get_platform(hass, *parts)
-    assert module is not None, component
-
-    # Either within HA or custom_components
-    # Either light/hue.py or hue/light.py
-    module_path = pathlib.Path(module.__file__)
-
-    # Compare to parent so we don't have to strip off `.py`
-    if module_path.parent.name == parts[0]:
-        # this is light/hue.py
-        filename = "{}.{}.json".format(parts[1], language)
-    else:
-        # this is hue/light.py
+    if is_platform:
         filename = "{}.{}.json".format(parts[0], language)
+        return str(integration.file_path / '.translations' / filename)
 
-    return str(module_path.parent / '.translations' / filename)
+    module = integration.get_component()
+
+    # If it's a component that is just one file, we don't support translations
+    # Example custom_components/my_component.py
+    if module.__name__ != module.__package__:
+        return None
+
+    filename = '{}.json'.format(language)
+    return str(integration.file_path / '.translations' / filename)
 
 
 def load_translations_files(translation_files: Dict[str, str]) \
@@ -130,8 +114,12 @@ async def async_get_component_resources(hass: HomeAssistantType,
     missing_components = components - set(translation_cache)
     missing_files = {}
     for component in missing_components:
-        missing_files[component] = component_translation_file(
-            hass, component, language)
+        path = await component_translation_file(hass, component, language)
+        # No translation available
+        if path is None:
+            translation_cache[component] = {}
+        else:
+            missing_files[component] = path
 
     # Load missing files
     if missing_files:

tests/helpers/test_translation.py

@@ -8,6 +8,7 @@ import pytest
 from homeassistant import config_entries
 import homeassistant.helpers.translation as translation
 from homeassistant.setup import async_setup_component
+from tests.common import mock_coro
 
 
 @pytest.fixture
@@ -52,20 +53,20 @@ async def test_component_translation_file(hass):
         'test_package'
     })
 
-    assert path.normpath(translation.component_translation_file(
+    assert path.normpath(await translation.component_translation_file(
         hass, 'switch.test', 'en')) == path.normpath(hass.config.path(
             'custom_components', 'test', '.translations', 'switch.en.json'))
 
-    assert path.normpath(translation.component_translation_file(
+    assert path.normpath(await translation.component_translation_file(
         hass, 'switch.test_embedded', 'en')) == path.normpath(hass.config.path(
             'custom_components', 'test_embedded', '.translations',
             'switch.en.json'))
 
-    assert path.normpath(translation.component_translation_file(
-        hass, 'test_standalone', 'en')) == path.normpath(hass.config.path(
-            'custom_components', '.translations', 'test_standalone.en.json'))
+    assert await translation.component_translation_file(
+        hass, 'test_standalone', 'en'
+    ) is None
 
-    assert path.normpath(translation.component_translation_file(
+    assert path.normpath(await translation.component_translation_file(
         hass, 'test_package', 'en')) == path.normpath(hass.config.path(
             'custom_components', 'test_package', '.translations', 'en.json'))
 
@@ -133,7 +134,7 @@ async def test_get_translations_loads_config_flows(hass, mock_config_flows):
     mock_config_flows.append('component1')
 
     with patch.object(translation, 'component_translation_file',
-                      return_value='bla.json'), \
+                      return_value=mock_coro('bla.json')), \
             patch.object(translation, 'load_translations_files', return_value={
                 'component1': {'hello': 'world'}}):
         translations = await translation.async_get_translations(hass, 'en')