Add turn_on/off service to camera (#15051)

* Add turn_on/off to camera

* Add turn_on/off supported features to camera.

Add turn_on/off service implementation to camera, add turn_on/off
 supported features and services to Demo camera.

* Add camera supported_features tests

* Resolve code review comment

* Fix unit test

* Use async_add_executor_job

* Address review comment, change DemoCamera to local push

* Rewrite tests/components/camera/test_demo

* raise HTTPError instead return response

homeassistant/components/camera/__init__.py

@@ -19,7 +19,8 @@
 import voluptuous as vol
 
 from homeassistant.core import callback
-from homeassistant.const import ATTR_ENTITY_ID
+from homeassistant.const import ATTR_ENTITY_ID, SERVICE_TURN_OFF, \
+    SERVICE_TURN_ON
 from homeassistant.exceptions import HomeAssistantError
 from homeassistant.loader import bind_hass
 from homeassistant.helpers.entity import Entity
@@ -47,6 +48,9 @@
 STATE_STREAMING = 'streaming'
 STATE_IDLE = 'idle'
 
+# Bitfield of features supported by the camera entity
+SUPPORT_ON_OFF = 1
+
 DEFAULT_CONTENT_TYPE = 'image/jpeg'
 ENTITY_IMAGE_URL = '/api/camera_proxy/{0}?token={1}'
 
@@ -79,6 +83,35 @@ class Image:
     content = attr.ib(type=bytes)
 
 
+@bind_hass
+def turn_off(hass, entity_id=None):
+    """Turn off camera."""
+    hass.add_job(async_turn_off, hass, entity_id)
+
+
+@bind_hass
+async def async_turn_off(hass, entity_id=None):
+    """Turn off camera."""
+    data = {ATTR_ENTITY_ID: entity_id} if entity_id else {}
+    await hass.services.async_call(DOMAIN, SERVICE_TURN_OFF, data)
+
+
+@bind_hass
+def turn_on(hass, entity_id=None):
+    """Turn on camera."""
+    hass.add_job(async_turn_on, hass, entity_id)
+
+
+@bind_hass
+async def async_turn_on(hass, entity_id=None):
+    """Turn on camera, and set operation mode."""
+    data = {}
+    if entity_id is not None:
+        data[ATTR_ENTITY_ID] = entity_id
+
+    await hass.services.async_call(DOMAIN, SERVICE_TURN_ON, data)
+
+
 @bind_hass
 def enable_motion_detection(hass, entity_id=None):
     """Enable Motion Detection."""
@@ -119,6 +152,9 @@ async def async_get_image(hass, entity_id, timeout=10):
     if camera is None:
         raise HomeAssistantError('Camera not found')
 
+    if not camera.is_on:
+        raise HomeAssistantError('Camera is off')
+
     with suppress(asyncio.CancelledError, asyncio.TimeoutError):
         with async_timeout.timeout(timeout, loop=hass.loop):
             image = await camera.async_camera_image()
@@ -163,6 +199,12 @@ async def async_handle_camera_service(service):
                 await camera.async_enable_motion_detection()
             elif service.service == SERVICE_DISABLE_MOTION:
                 await camera.async_disable_motion_detection()
+            elif service.service == SERVICE_TURN_OFF and \
+                    camera.supported_features & SUPPORT_ON_OFF:
+                await camera.async_turn_off()
+            elif service.service == SERVICE_TURN_ON and \
+                    camera.supported_features & SUPPORT_ON_OFF:
+                await camera.async_turn_on()
 
             if not camera.should_poll:
                 continue
@@ -200,6 +242,12 @@ def _write_image(to_file, image_data):
             except OSError as err:
                 _LOGGER.error("Can't write image to file: %s", err)
 
+    hass.services.async_register(
+        DOMAIN, SERVICE_TURN_OFF, async_handle_camera_service,
+        schema=CAMERA_SERVICE_SCHEMA)
+    hass.services.async_register(
+        DOMAIN, SERVICE_TURN_ON, async_handle_camera_service,
+        schema=CAMERA_SERVICE_SCHEMA)
     hass.services.async_register(
         DOMAIN, SERVICE_ENABLE_MOTION, async_handle_camera_service,
         schema=CAMERA_SERVICE_SCHEMA)
@@ -243,6 +291,11 @@ def entity_picture(self):
         """Return a link to the camera feed as entity picture."""
         return ENTITY_IMAGE_URL.format(self.entity_id, self.access_tokens[-1])
 
+    @property
+    def supported_features(self):
+        """Flag supported features."""
+        return 0
+
     @property
     def is_recording(self):
         """Return true if the device is recording."""
@@ -337,10 +390,34 @@ def state(self):
             return STATE_STREAMING
         return STATE_IDLE
 
+    @property
+    def is_on(self):
+        """Return true if on."""
+        return True
+
+    def turn_off(self):
+        """Turn off camera."""
+        raise NotImplementedError()
+
+    @callback
+    def async_turn_off(self):
+        """Turn off camera."""
+        return self.hass.async_add_job(self.turn_off)
+
+    def turn_on(self):
+        """Turn off camera."""
+        raise NotImplementedError()
+
+    @callback
+    def async_turn_on(self):
+        """Turn off camera."""
+        return self.hass.async_add_job(self.turn_on)
+
     def enable_motion_detection(self):
         """Enable motion detection in the camera."""
         raise NotImplementedError()
 
+    @callback
     def async_enable_motion_detection(self):
         """Call the job and enable motion detection."""
         return self.hass.async_add_job(self.enable_motion_detection)
@@ -349,6 +426,7 @@ def disable_motion_detection(self):
         """Disable motion detection in camera."""
         raise NotImplementedError()
 
+    @callback
     def async_disable_motion_detection(self):
         """Call the job and disable motion detection."""
         return self.hass.async_add_job(self.disable_motion_detection)
@@ -393,15 +471,18 @@ async def get(self, request, entity_id):
         camera = self.component.get_entity(entity_id)
 
         if camera is None:
-            status = 404 if request[KEY_AUTHENTICATED] else 401
-            return web.Response(status=status)
+            raise web.HTTPNotFound()
 
         authenticated = (request[KEY_AUTHENTICATED] or
                          request.query.get('token') in camera.access_tokens)
 
         if not authenticated:
             raise web.HTTPUnauthorized()
 
+        if not camera.is_on:
+            _LOGGER.debug('Camera is off.')
+            raise web.HTTPServiceUnavailable()
+
         return await self.handle(request, camera)
 
     async def handle(self, request, camera):

homeassistant/components/camera/demo.py

@@ -4,10 +4,10 @@
 For more details about this platform, please refer to the documentation
 https://home-assistant.io/components/demo/
 """
-import os
 import logging
-import homeassistant.util.dt as dt_util
-from homeassistant.components.camera import Camera
+import os
+
+from homeassistant.components.camera import Camera, SUPPORT_ON_OFF
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -16,26 +16,29 @@ async def async_setup_platform(hass, config, async_add_devices,
                                discovery_info=None):
     """Set up the Demo camera platform."""
     async_add_devices([
-        DemoCamera(hass, config, 'Demo camera')
+        DemoCamera('Demo camera')
     ])
 
 
 class DemoCamera(Camera):
     """The representation of a Demo camera."""
 
-    def __init__(self, hass, config, name):
+    def __init__(self, name):
         """Initialize demo camera component."""
         super().__init__()
-        self._parent = hass
         self._name = name
         self._motion_status = False
+        self.is_streaming = True
+        self._images_index = 0
 
     def camera_image(self):
         """Return a faked still image response."""
-        now = dt_util.utcnow()
+        self._images_index = (self._images_index + 1) % 4
 
         image_path = os.path.join(
-            os.path.dirname(__file__), 'demo_{}.jpg'.format(now.second % 4))
+            os.path.dirname(__file__),
+            'demo_{}.jpg'.format(self._images_index))
+        _LOGGER.debug('Loading camera_image: %s', image_path)
         with open(image_path, 'rb') as file:
             return file.read()
 
@@ -46,8 +49,21 @@ def name(self):
 
     @property
     def should_poll(self):
-        """Camera should poll periodically."""
-        return True
+        """Demo camera doesn't need poll.
+
+        Need explicitly call schedule_update_ha_state() after state changed.
+        """
+        return False
+
+    @property
+    def supported_features(self):
+        """Camera support turn on/off features."""
+        return SUPPORT_ON_OFF
+
+    @property
+    def is_on(self):
+        """Whether camera is on (streaming)."""
+        return self.is_streaming
 
     @property
     def motion_detection_enabled(self):
@@ -57,7 +73,19 @@ def motion_detection_enabled(self):
     def enable_motion_detection(self):
         """Enable the Motion detection in base station (Arm)."""
         self._motion_status = True
+        self.schedule_update_ha_state()
 
     def disable_motion_detection(self):
         """Disable the motion detection in base station (Disarm)."""
         self._motion_status = False
+        self.schedule_update_ha_state()
+
+    def turn_off(self):
+        """Turn off camera."""
+        self.is_streaming = False
+        self.schedule_update_ha_state()
+
+    def turn_on(self):
+        """Turn on camera."""
+        self.is_streaming = True
+        self.schedule_update_ha_state()

homeassistant/components/camera/services.yaml

@@ -1,5 +1,19 @@
 # Describes the format for available camera services
 
+turn_off:
+  description: Turn off camera.
+  fields:
+    entity_id:
+      description: Entity id.
+      example: 'camera.living_room'
+
+turn_on:
+  description: Turn on camera.
+  fields:
+    entity_id:
+      description: Entity id.
+      example: 'camera.living_room'
+
 enable_motion_detection:
   description: Enable the motion detection in a camera.
   fields:

tests/components/camera/test_demo.py

@@ -1,14 +1,89 @@
 """The tests for local file camera component."""
-import asyncio
+from unittest.mock import mock_open, patch, PropertyMock
+
+import pytest
+
 from homeassistant.components import camera
+from homeassistant.components.camera import STATE_STREAMING, STATE_IDLE
+from homeassistant.exceptions import HomeAssistantError
 from homeassistant.setup import async_setup_component
 
 
-@asyncio.coroutine
-def test_motion_detection(hass):
+@pytest.fixture
+def demo_camera(hass):
+    """Initialize a demo camera platform."""
+    hass.loop.run_until_complete(async_setup_component(hass, 'camera', {
+        camera.DOMAIN: {
+            'platform': 'demo'
+        }
+    }))
+    return hass.data['camera'].get_entity('camera.demo_camera')
+
+
+async def test_init_state_is_streaming(hass, demo_camera):
+    """Demo camera initialize as streaming."""
+    assert demo_camera.state == STATE_STREAMING
+
+    mock_on_img = mock_open(read_data=b'ON')
+    with patch('homeassistant.components.camera.demo.open', mock_on_img,
+               create=True):
+        image = await camera.async_get_image(hass, demo_camera.entity_id)
+        assert mock_on_img.called
+        assert mock_on_img.call_args_list[0][0][0][-6:] \
+            in ['_0.jpg', '_1.jpg', '_2.jpg', '_3.jpg']
+        assert image.content == b'ON'
+
+
+async def test_turn_on_state_back_to_streaming(hass, demo_camera):
+    """After turn on state back to streaming."""
+    assert demo_camera.state == STATE_STREAMING
+    await camera.async_turn_off(hass, demo_camera.entity_id)
+    await hass.async_block_till_done()
+
+    assert demo_camera.state == STATE_IDLE
+
+    await camera.async_turn_on(hass, demo_camera.entity_id)
+    await hass.async_block_till_done()
+
+    assert demo_camera.state == STATE_STREAMING
+
+
+async def test_turn_off_image(hass, demo_camera):
+    """After turn off, Demo camera raise error."""
+    await camera.async_turn_off(hass, demo_camera.entity_id)
+    await hass.async_block_till_done()
+
+    with pytest.raises(HomeAssistantError) as error:
+        await camera.async_get_image(hass, demo_camera.entity_id)
+        assert error.args[0] == 'Camera is off'
+
+
+async def test_turn_off_invalid_camera(hass, demo_camera):
+    """Turn off non-exist camera should quietly fail."""
+    assert demo_camera.state == STATE_STREAMING
+    await camera.async_turn_off(hass, 'camera.invalid_camera')
+    await hass.async_block_till_done()
+
+    assert demo_camera.state == STATE_STREAMING
+
+
+async def test_turn_off_unsupport_camera(hass, demo_camera):
+    """Turn off unsupported camera should quietly fail."""
+    assert demo_camera.state == STATE_STREAMING
+    with patch('homeassistant.components.camera.demo.DemoCamera'
+               '.supported_features', new_callable=PropertyMock) as m:
+        m.return_value = 0
+
+        await camera.async_turn_off(hass, demo_camera.entity_id)
+        await hass.async_block_till_done()
+
+    assert demo_camera.state == STATE_STREAMING
+
+
+async def test_motion_detection(hass):
     """Test motion detection services."""
     # Setup platform
-    yield from async_setup_component(hass, 'camera', {
+    await async_setup_component(hass, 'camera', {
         'camera': {
             'platform': 'demo'
         }
@@ -20,7 +95,7 @@ def test_motion_detection(hass):
 
     # Call service to turn on motion detection
     camera.enable_motion_detection(hass, 'camera.demo_camera')
-    yield from hass.async_block_till_done()
+    await hass.async_block_till_done()
 
     # Check if state has been updated.
     state = hass.states.get('camera.demo_camera')