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Update event documentation (#21378)
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Eiko Wagenknecht
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@ -7,36 +7,24 @@ The core of Home Assistant is the event bus. The event bus allows any integratio
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Home Assistant contains a few built-in events that are used to coordinate between various integrations.
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## Event `state_changed`
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## Common fields
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Event `state_changed` is fired when a state changes. Both `old_state` and `new_state` are state objects. [Documentation about state objects.](/topics/state_object/)
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All events share these basic fields.
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| Field | Description |
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| ----------- | --------------------------------------------------------------------------------------------------- |
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| `entity_id` | Entity ID of the changed entity. Example: `light.kitchen` |
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| `old_state` | The previous state of the entity before it changed. This field is omitted if the entity is new. |
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| `new_state` | The new state of the entity. This field is omitted if the entity is removed from the state machine. |
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| Field | Description |
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| ------------ | -------------------------------------------------------------------------------------------------------------------------------------------- |
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| `event_type` | Type of the event. Example: `call_service`. |
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| `origin` | Origin of the event. `REMOTE` (coming in from the API, e.g. a webhook) or `LOCAL` (everything else). |
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| `time_fired` | When the event was fired. Example: `2022-01-28T12:19:53.736380+00:00`. |
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| `context` | Dictionary with the [context](https://data.home-assistant.io/docs/context/). Example: `{ 'id': '123', "parent_id": null, 'user_id': 'abc'}`. |
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## Event `time_changed`
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In addition, all events contain a `data` dictionary with event-specific information. These are described below.
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Event `time_changed` is fired every second by the timer and contains the current time.
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## Built-in Events (core)
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| Field | Description |
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| ----- | ---------------------------------------------------------------------------------------------------------------------------- |
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| `now` | A [datetime object](https://docs.python.org/3.4/library/datetime.html#datetime.datetime) containing the current time in UTC. |
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### `call_service`
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## Event `service_registered`
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Event `service_registered` is fired when a new service has been registered within Home Assistant.
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| Field | Description |
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| --------- | ---------------------------------------- |
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| `domain` | Domain of the service. Example: `light`. |
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| `service` | The service to call. Example: `turn_on` |
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## Event `call_service`
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Event `call_service` is fired to call a service.
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This event is fired when a service is called.
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| Field | Description |
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| ----------------- | ------------------------------------------------------------------------------ |
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@ -45,29 +33,165 @@ Event `call_service` is fired to call a service.
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| `service_data` | Dictionary with the service call parameters. Example: `{ 'brightness': 120 }`. |
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| `service_call_id` | String with a unique call id. Example: `23123-4`. |
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## Event `automation_reloaded`
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### `component_loaded`
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Event `automation_reloaded` is fired when automations have been reloaded and thus might have changed.
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This event is fired when a new integration has been loaded and initialized.
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This event has no additional data.
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## Event `scene_reloaded`
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Event `scene_reloaded` is fired when scenes have been reloaded and thus might have changed.
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## Event `platform_discovered`
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Event `platform_discovered` is fired when a new platform has been discovered by the [`discovery`](/integrations/discovery/) component.
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| Field | Description |
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| ------------ | ------------------------------------------------------------------------------------------------ |
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| `service` | The platform that is discovered. Example: `zwave`. |
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| `discovered` | Dictionary containing discovery information. Example: `{ "host": "192.168.1.10", "port": 8889}`. |
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## Event `component_loaded`
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Event `component_loaded` is fired when a new integration has been loaded and initialized.
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Please note that while this event is fired for each loaded integration during Home Assistant startup, the automation engine of Home Assistant is started last. Thus this event can not be used to run automations during startup as it would have missed these events.
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| Field | Description |
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| ----------- | --------------------------------------------------------------------------- |
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| `component` | Domain of the integration that has just been initialized. Example: `light`. |
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### `core_config_updated`
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This event is fired when the core configuration is updated, for example when the location has been changed.
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It contains no additional data.
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### `data_entry_flow_progressed`
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This event is fired when a data entry flow has changed and is used by the frontend to reload the flow state.
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| Field | Description |
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| --------- | --------------------------- |
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| `handler` | The flow handler. |
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| `flow_id` | Identification of the flow. |
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### `homeassistant_start`, `homeassistant_started`
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These events are fired during the startup of Home Assistant, in the following order:
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1. `homeassistant_start`
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2. `homeassistant_started`
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These events contain no additional data.
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If you want to trigger automation on a Home Assistant start event, we recommend using the special [Home Assistant trigger](/docs/automation/trigger/#home-assistant-trigger) instead of listening to these events.
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### `homeassistant_stop`, `homeassistant_final_write`, `homeassistant_close`
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These events are fired during the shutdown of Home Assistant, in the following order:
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1. `homeassistant_stop`
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2. `homeassistant_final_write`
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3. `homeassistant_close`
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These events contain no additional data.
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Please note that `homeassistant_final_write` and `homeassistant_close`, cannot be used with automations, as the automation engine would already have been stopped when those are fired.
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If you want to trigger automation on a Home Assistant stop event, we recommend using the special [Home Assistant trigger](/docs/automation/trigger/#home-assistant-trigger) instead of listening to these events.
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### `logbook_entry`
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| Field | Description |
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| ----------- | --------------------------------------------------- |
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| `name` | Name of the entity. Example: `Litchen light`. |
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| `message` | Message. Example: `was turned on` |
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| `domain` | Optional, domain of the entry. Example: `light` |
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| `entity_id` | Optional, identifier of the entity that was logged. |
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### `service_registered`
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This event is fired when a new service has been registered within Home Assistant.
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| Field | Description |
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| --------- | ----------------------------------------------------------------------- |
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| `domain` | The domain of the component that offers this service. Example: `light`. |
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| `service` | The name of the service. Example: `turn_on` |
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### `service_removed`
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This event is fired when a service has been removed from Home Assistant.
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| Field | Description |
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| --------- | ----------------------------------------------------------------------- |
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| `domain` | The domain of the component that offers this service. Example: `light`. |
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| `service` | The name of the service. Example: `turn_on` |
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### `state_changed`
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This event is fired when a state has changed. It contains the entity identifier and both the `new_state` and `old_state` of the entity as [state objects](/topics/state_object/).
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| Field | Description |
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| ----------- | --------------------------------------------------------------------------------------------------- |
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| `entity_id` | Identifier of the entity that has changed. Example: `light.kitchen` |
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| `old_state` | The previous state of the entity before it changed. Omitted if the state is set for the first time. |
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| `new_state` | The new state of the entity. Omitted if the state has been removed. |
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### `themes_updated`
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This event is fired after a theme has been set or reloaded. It contains no additional data.
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### `timer_out_of_sync`
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This event is fired after `time_changed` if there was more that one second delay.
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| Field | Description |
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| --------- | --------------------- |
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| `seconds` | The delay in seconds. |
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### `time_changed`
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This event is fired every second by the timer and contains the current time.
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| Field | Description |
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| ----- | -------------------------------------------------------------------------------------------------------------------------- |
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| `now` | A [datetime object](https://docs.python.org/3/library/datetime.html#datetime.datetime) containing the current time in UTC. |
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## `user_added`
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This event is fired when a user has been added.
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| Field | Description |
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| --------- | ------------------------------- |
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| `user_id` | Identification of the new user. |
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## `user_removed`
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This event is fired when a user has been removed.
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| Field | Description |
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| --------- | ----------------------------------- |
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| `user_id` | Identification of the removed user. |
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### Built-in events (default integrations)
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## `automation_reloaded`
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Integration: [`automation`](/integrations/automation/)
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This event is fired when automations have been reloaded and thus might have changed.
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This event contains no additional data.
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## `automation_triggered`
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Integration: [`automation`](/integrations/automation/)
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This event is fired when an automation is triggered.
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| Field | Description |
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| ----------- | --------------------------------- |
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| `name` | The name of the automation. |
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| `entity_id` | The identifier of the automation. |
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## `scene_reloaded`
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Integration: [`homeassistant`](/integrations/homeassistant/)
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This event is fired when scenes have been reloaded and thus might have changed.
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This event contains no additional data.
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## `script_started`
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Integration: [`script`](/integrations/script/)
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This event is fired when a script is run. A script can be invoked by a user or triggered by an automation. The resulting changes can be tracked because all related events will share the same context as this event.
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| Field | Description |
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| ----------- | -------------------------------------- |
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| `name` | Name of the script that was run. |
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| `entity_id` | Identifier of the script that was run. |
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