mirror of
https://github.com/home-assistant/core
synced 2024-09-06 10:29:55 +02:00
590 lines
18 KiB
Python
590 lines
18 KiB
Python
"""Helper to deal with YAML + storage."""
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from __future__ import annotations
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from abc import ABC, abstractmethod
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import asyncio
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from collections.abc import Awaitable, Callable, Coroutine, Iterable
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from dataclasses import dataclass
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from itertools import groupby
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import logging
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from typing import Any, Optional, cast
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import voluptuous as vol
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from voluptuous.humanize import humanize_error
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from homeassistant.components import websocket_api
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from homeassistant.const import CONF_ID
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from homeassistant.core import HomeAssistant, callback
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from homeassistant.exceptions import HomeAssistantError
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from homeassistant.util import slugify
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from . import entity_registry
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from .entity import Entity
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from .entity_component import EntityComponent
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from .storage import Store
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from .typing import ConfigType
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STORAGE_VERSION = 1
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SAVE_DELAY = 10
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CHANGE_ADDED = "added"
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CHANGE_UPDATED = "updated"
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CHANGE_REMOVED = "removed"
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@dataclass
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class CollectionChangeSet:
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"""Class to represent a change set.
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change_type: One of CHANGE_*
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item_id: The id of the item
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item: The item
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"""
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change_type: str
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item_id: str
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item: Any
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ChangeListener = Callable[
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[
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# Change type
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str,
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# Item ID
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str,
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# New or removed config
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dict,
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],
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Awaitable[None],
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]
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ChangeSetListener = Callable[[Iterable[CollectionChangeSet]], Awaitable[None]]
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class CollectionError(HomeAssistantError):
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"""Base class for collection related errors."""
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class ItemNotFound(CollectionError):
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"""Raised when an item is not found."""
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def __init__(self, item_id: str) -> None:
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"""Initialize item not found error."""
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super().__init__(f"Item {item_id} not found.")
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self.item_id = item_id
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class IDManager:
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"""Keep track of IDs across different collections."""
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def __init__(self) -> None:
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"""Initiate the ID manager."""
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self.collections: list[dict[str, Any]] = []
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def add_collection(self, collection: dict[str, Any]) -> None:
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"""Add a collection to check for ID usage."""
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self.collections.append(collection)
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def has_id(self, item_id: str) -> bool:
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"""Test if the ID exists."""
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return any(item_id in collection for collection in self.collections)
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def generate_id(self, suggestion: str) -> str:
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"""Generate an ID."""
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base = slugify(suggestion)
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proposal = base
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attempt = 1
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while self.has_id(proposal):
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attempt += 1
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proposal = f"{base}_{attempt}"
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return proposal
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class CollectionEntity(Entity):
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"""Mixin class for entities managed by an ObservableCollection."""
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@classmethod
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@abstractmethod
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def from_storage(cls, config: ConfigType) -> CollectionEntity:
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"""Create instance from storage."""
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@classmethod
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@abstractmethod
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def from_yaml(cls, config: ConfigType) -> CollectionEntity:
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"""Create instance from yaml config."""
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@abstractmethod
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async def async_update_config(self, config: ConfigType) -> None:
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"""Handle updated configuration."""
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class ObservableCollection(ABC):
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"""Base collection type that can be observed."""
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def __init__(
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self, logger: logging.Logger, id_manager: IDManager | None = None
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) -> None:
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"""Initialize the base collection."""
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self.logger = logger
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self.id_manager = id_manager or IDManager()
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self.data: dict[str, dict] = {}
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self.listeners: list[ChangeListener] = []
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self.change_set_listeners: list[ChangeSetListener] = []
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self.id_manager.add_collection(self.data)
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@callback
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def async_items(self) -> list[dict]:
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"""Return list of items in collection."""
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return list(self.data.values())
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@callback
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def async_add_listener(self, listener: ChangeListener) -> None:
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"""Add a listener.
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Will be called with (change_type, item_id, updated_config).
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"""
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self.listeners.append(listener)
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@callback
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def async_add_change_set_listener(self, listener: ChangeSetListener) -> None:
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"""Add a listener for a full change set.
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Will be called with [(change_type, item_id, updated_config), ...]
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"""
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self.change_set_listeners.append(listener)
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async def notify_changes(self, change_sets: Iterable[CollectionChangeSet]) -> None:
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"""Notify listeners of a change."""
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await asyncio.gather(
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*(
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listener(change_set.change_type, change_set.item_id, change_set.item)
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for listener in self.listeners
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for change_set in change_sets
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),
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*(
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change_set_listener(change_sets)
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for change_set_listener in self.change_set_listeners
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),
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)
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class YamlCollection(ObservableCollection):
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"""Offer a collection based on static data."""
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@staticmethod
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def create_entity(
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entity_class: type[CollectionEntity], config: ConfigType
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) -> CollectionEntity:
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"""Create a CollectionEntity instance."""
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return entity_class.from_yaml(config)
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async def async_load(self, data: list[dict]) -> None:
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"""Load the YAML collection. Overrides existing data."""
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old_ids = set(self.data)
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change_sets = []
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for item in data:
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item_id = item[CONF_ID]
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if item_id in old_ids:
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old_ids.remove(item_id)
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event = CHANGE_UPDATED
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elif self.id_manager.has_id(item_id):
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self.logger.warning("Duplicate ID '%s' detected, skipping", item_id)
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continue
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else:
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event = CHANGE_ADDED
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self.data[item_id] = item
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change_sets.append(CollectionChangeSet(event, item_id, item))
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for item_id in old_ids:
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change_sets.append(
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CollectionChangeSet(CHANGE_REMOVED, item_id, self.data.pop(item_id))
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)
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if change_sets:
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await self.notify_changes(change_sets)
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class StorageCollection(ObservableCollection, ABC):
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"""Offer a CRUD interface on top of JSON storage."""
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def __init__(
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self,
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store: Store,
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logger: logging.Logger,
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id_manager: IDManager | None = None,
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) -> None:
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"""Initialize the storage collection."""
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super().__init__(logger, id_manager)
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self.store = store
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@staticmethod
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def create_entity(
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entity_class: type[CollectionEntity], config: ConfigType
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) -> CollectionEntity:
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"""Create a CollectionEntity instance."""
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return entity_class.from_storage(config)
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@property
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def hass(self) -> HomeAssistant:
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"""Home Assistant object."""
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return self.store.hass
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async def _async_load_data(self) -> dict | None:
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"""Load the data."""
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return cast(Optional[dict], await self.store.async_load())
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async def async_load(self) -> None:
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"""Load the storage Manager."""
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raw_storage = await self._async_load_data()
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if raw_storage is None:
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raw_storage = {"items": []}
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for item in raw_storage["items"]:
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self.data[item[CONF_ID]] = item
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await self.notify_changes(
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[
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CollectionChangeSet(CHANGE_ADDED, item[CONF_ID], item)
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for item in raw_storage["items"]
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]
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)
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@abstractmethod
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async def _process_create_data(self, data: dict) -> dict:
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"""Validate the config is valid."""
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@callback
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@abstractmethod
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def _get_suggested_id(self, info: dict) -> str:
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"""Suggest an ID based on the config."""
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@abstractmethod
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async def _update_data(self, data: dict, update_data: dict) -> dict:
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"""Return a new updated data object."""
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async def async_create_item(self, data: dict) -> dict:
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"""Create a new item."""
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item = await self._process_create_data(data)
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item[CONF_ID] = self.id_manager.generate_id(self._get_suggested_id(item))
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self.data[item[CONF_ID]] = item
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self._async_schedule_save()
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await self.notify_changes(
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[CollectionChangeSet(CHANGE_ADDED, item[CONF_ID], item)]
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)
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return item
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async def async_update_item(self, item_id: str, updates: dict) -> dict:
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"""Update item."""
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if item_id not in self.data:
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raise ItemNotFound(item_id)
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if CONF_ID in updates:
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raise ValueError("Cannot update ID")
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current = self.data[item_id]
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updated = await self._update_data(current, updates)
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self.data[item_id] = updated
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self._async_schedule_save()
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await self.notify_changes(
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[CollectionChangeSet(CHANGE_UPDATED, item_id, updated)]
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)
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return self.data[item_id]
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async def async_delete_item(self, item_id: str) -> None:
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"""Delete item."""
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if item_id not in self.data:
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raise ItemNotFound(item_id)
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item = self.data.pop(item_id)
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self._async_schedule_save()
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await self.notify_changes([CollectionChangeSet(CHANGE_REMOVED, item_id, item)])
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@callback
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def _async_schedule_save(self) -> None:
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"""Schedule saving the area registry."""
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self.store.async_delay_save(self._data_to_save, SAVE_DELAY)
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@callback
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def _data_to_save(self) -> dict:
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"""Return data of area registry to store in a file."""
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return {"items": list(self.data.values())}
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class IDLessCollection(YamlCollection):
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"""A collection without IDs."""
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counter = 0
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async def async_load(self, data: list[dict]) -> None:
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"""Load the collection. Overrides existing data."""
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await self.notify_changes(
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[
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CollectionChangeSet(CHANGE_REMOVED, item_id, item)
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for item_id, item in list(self.data.items())
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]
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)
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self.data.clear()
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for item in data:
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self.counter += 1
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item_id = f"fakeid-{self.counter}"
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self.data[item_id] = item
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await self.notify_changes(
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[
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CollectionChangeSet(CHANGE_ADDED, item_id, item)
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for item_id, item in self.data.items()
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]
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)
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@callback
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def sync_entity_lifecycle(
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hass: HomeAssistant,
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domain: str,
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platform: str,
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entity_component: EntityComponent,
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collection: StorageCollection | YamlCollection,
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entity_class: type[CollectionEntity],
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) -> None:
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"""Map a collection to an entity component."""
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entities: dict[str, CollectionEntity] = {}
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ent_reg = entity_registry.async_get(hass)
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async def _add_entity(change_set: CollectionChangeSet) -> CollectionEntity:
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def entity_removed() -> None:
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"""Remove entity from entities if it's removed or not added."""
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if change_set.item_id in entities:
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entities.pop(change_set.item_id)
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entities[change_set.item_id] = collection.create_entity(
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entity_class, change_set.item
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)
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entities[change_set.item_id].async_on_remove(entity_removed)
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return entities[change_set.item_id]
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async def _remove_entity(change_set: CollectionChangeSet) -> None:
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ent_to_remove = ent_reg.async_get_entity_id(
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domain, platform, change_set.item_id
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)
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if ent_to_remove is not None:
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ent_reg.async_remove(ent_to_remove)
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elif change_set.item_id in entities:
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await entities[change_set.item_id].async_remove(force_remove=True)
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# Unconditionally pop the entity from the entity list to avoid racing against
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# the entity registry event handled by Entity._async_registry_updated
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if change_set.item_id in entities:
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entities.pop(change_set.item_id)
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async def _update_entity(change_set: CollectionChangeSet) -> None:
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if change_set.item_id not in entities:
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return
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await entities[change_set.item_id].async_update_config(change_set.item)
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_func_map: dict[
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str,
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Callable[[CollectionChangeSet], Coroutine[Any, Any, CollectionEntity | None]],
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] = {
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CHANGE_ADDED: _add_entity,
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CHANGE_REMOVED: _remove_entity,
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CHANGE_UPDATED: _update_entity,
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}
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async def _collection_changed(change_sets: Iterable[CollectionChangeSet]) -> None:
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"""Handle a collection change."""
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# Create a new bucket every time we have a different change type
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# to ensure operations happen in order. We only group
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# the same change type.
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for _, grouped in groupby(
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change_sets, lambda change_set: change_set.change_type
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):
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new_entities = [
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entity
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for entity in await asyncio.gather(
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*(
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_func_map[change_set.change_type](change_set)
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for change_set in grouped
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)
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)
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if entity is not None
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]
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if new_entities:
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await entity_component.async_add_entities(new_entities)
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collection.async_add_change_set_listener(_collection_changed)
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class StorageCollectionWebsocket:
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"""Class to expose storage collection management over websocket."""
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def __init__(
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self,
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storage_collection: StorageCollection,
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api_prefix: str,
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model_name: str,
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create_schema: dict,
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update_schema: dict,
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) -> None:
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"""Initialize a websocket CRUD."""
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self.storage_collection = storage_collection
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self.api_prefix = api_prefix
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self.model_name = model_name
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self.create_schema = create_schema
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self.update_schema = update_schema
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assert self.api_prefix[-1] != "/", "API prefix should not end in /"
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@property
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def item_id_key(self) -> str:
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"""Return item ID key."""
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return f"{self.model_name}_id"
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@callback
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def async_setup(
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self,
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hass: HomeAssistant,
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*,
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create_list: bool = True,
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create_create: bool = True,
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) -> None:
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"""Set up the websocket commands."""
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if create_list:
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websocket_api.async_register_command(
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hass,
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f"{self.api_prefix}/list",
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self.ws_list_item,
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websocket_api.BASE_COMMAND_MESSAGE_SCHEMA.extend(
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{vol.Required("type"): f"{self.api_prefix}/list"}
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),
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)
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if create_create:
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websocket_api.async_register_command(
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hass,
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f"{self.api_prefix}/create",
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websocket_api.require_admin(
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websocket_api.async_response(self.ws_create_item)
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),
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websocket_api.BASE_COMMAND_MESSAGE_SCHEMA.extend(
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{
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**self.create_schema,
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vol.Required("type"): f"{self.api_prefix}/create",
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}
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),
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)
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websocket_api.async_register_command(
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hass,
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f"{self.api_prefix}/update",
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websocket_api.require_admin(
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websocket_api.async_response(self.ws_update_item)
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),
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websocket_api.BASE_COMMAND_MESSAGE_SCHEMA.extend(
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{
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**self.update_schema,
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vol.Required("type"): f"{self.api_prefix}/update",
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vol.Required(self.item_id_key): str,
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}
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),
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)
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websocket_api.async_register_command(
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hass,
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f"{self.api_prefix}/delete",
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websocket_api.require_admin(
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websocket_api.async_response(self.ws_delete_item)
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),
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websocket_api.BASE_COMMAND_MESSAGE_SCHEMA.extend(
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{
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vol.Required("type"): f"{self.api_prefix}/delete",
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vol.Required(self.item_id_key): str,
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}
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),
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)
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def ws_list_item(
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self, hass: HomeAssistant, connection: websocket_api.ActiveConnection, msg: dict
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) -> None:
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"""List items."""
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connection.send_result(msg["id"], self.storage_collection.async_items())
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async def ws_create_item(
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self, hass: HomeAssistant, connection: websocket_api.ActiveConnection, msg: dict
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) -> None:
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"""Create a item."""
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try:
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data = dict(msg)
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data.pop("id")
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data.pop("type")
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item = await self.storage_collection.async_create_item(data)
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connection.send_result(msg["id"], item)
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except vol.Invalid as err:
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connection.send_error(
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msg["id"],
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websocket_api.const.ERR_INVALID_FORMAT,
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humanize_error(data, err),
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)
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except ValueError as err:
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connection.send_error(
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msg["id"], websocket_api.const.ERR_INVALID_FORMAT, str(err)
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)
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async def ws_update_item(
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self, hass: HomeAssistant, connection: websocket_api.ActiveConnection, msg: dict
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) -> None:
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"""Update a item."""
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data = dict(msg)
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msg_id = data.pop("id")
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item_id = data.pop(self.item_id_key)
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data.pop("type")
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try:
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|
item = await self.storage_collection.async_update_item(item_id, data)
|
|
connection.send_result(msg_id, item)
|
|
except ItemNotFound:
|
|
connection.send_error(
|
|
msg["id"],
|
|
websocket_api.const.ERR_NOT_FOUND,
|
|
f"Unable to find {self.item_id_key} {item_id}",
|
|
)
|
|
except vol.Invalid as err:
|
|
connection.send_error(
|
|
msg["id"],
|
|
websocket_api.const.ERR_INVALID_FORMAT,
|
|
humanize_error(data, err),
|
|
)
|
|
except ValueError as err:
|
|
connection.send_error(
|
|
msg_id, websocket_api.const.ERR_INVALID_FORMAT, str(err)
|
|
)
|
|
|
|
async def ws_delete_item(
|
|
self, hass: HomeAssistant, connection: websocket_api.ActiveConnection, msg: dict
|
|
) -> None:
|
|
"""Delete a item."""
|
|
try:
|
|
await self.storage_collection.async_delete_item(msg[self.item_id_key])
|
|
except ItemNotFound:
|
|
connection.send_error(
|
|
msg["id"],
|
|
websocket_api.const.ERR_NOT_FOUND,
|
|
f"Unable to find {self.item_id_key} {msg[self.item_id_key]}",
|
|
)
|
|
|
|
connection.send_result(msg["id"])
|