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perf(bundle): lazy-load the nunjucks template engine (#2535)

Browse Source 
Closes #2531.

## Summary

The full `nunjucks` templating engine (~226KB) plus `ha-nunjucks`
(~46KB) — roughly **272KB, ~13% of the eager entry chunk** — was
statically imported and downloaded by every card on initial load, even
though templates only apply when a config value contains a `{{ … }}` /
`{% … %}` delimiter. Most cards use no templates and never need the
engine.

This defers the engine behind a dynamic `import('ha-nunjucks/dist')` so
it ships in a separate, on-demand chunk instead of the eager
`card-*.js`.

## Approach

The render path (`TemplateRenderer.renderRecursively`) is **kept
synchronous** — it is called from many synchronous hot paths
(condition/trigger evaluators, picture-elements rendering, actions,
folder matchers), and making it async would be a large, high-risk
refactor of the evaluation core.

Instead:

- **New `src/card-controller/templates/engine.ts`** — a module-level
singleton lazy loader (`loadTemplateEngine()` / `getTemplateEngine()`)
shared across all `TemplateRenderer` instances, plus a
`containsTemplate()` delimiter helper.
- **Delimiter gating** — strings without a delimiter never touch the
engine (the overwhelming majority of renders).
- **Pre-warm at config time** — because every template string originates
in the config, a new mandatory `TEMPLATE_ENGINE` initialization aspect
loads the engine before first render whenever the config contains a
delimiter. This **guarantees no raw `{{ … }}` flash**: content/condition
rendering is blocked until the engine is present for template-using
cards. Cards without templates never load it.

## Result

- nunjucks + ha-nunjucks move out of the eager chunk into a separate
chunk fetched only when a card actually uses templates.
- No change to the synchronous public render API; condition/trigger
evaluation core untouched.

## Tests

- New `engine.ts` loader coverage (concurrent load, cached reuse,
not-loaded fallback).
- The 11 existing test files that render real (delimiter-bearing)
templates declare their dependency explicitly via
`beforeAll(loadTemplateEngine)` — no global/implicit setup hook.
- Full suite green (4764 tests), lint and ts-prune clean, per-file 100%
coverage maintained for the affected directories.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

https://claude.ai/code/session_016ykWemdkZrgywvC71pHc6c

---
_Generated by [Claude
Code](https://claude.ai/code/session_016ykWemdkZrgywvC71pHc6c)_
This commit is contained in:
Dermot Duffy
2026-06-30 17:45:13 -07:00
committed by dermotduffy
parent b33c034810
commit ea251ca988
59 changed files with 1420 additions and 541 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/card-controller/actions/actions-manager.ts
+47 -59
View File
@@ -1,7 +1,6 @@
import type { ActionContext } from 'action';
import { z } from 'zod';
import type { TriggerData } from '../../condition-trigger/triggers/types.js';
import type {
ActionConfig,
Actions,
@@ -13,14 +12,9 @@ import {
isAdvancedCameraCardCustomAction,
} from '../../utils/action.js';
import { allPromises, errorToConsole } from '../../utils/basic.js';
import type { TemplateRenderer } from '../templates/index.js';
import type { CardActionsManagerAPI } from '../types.js';
import { ActionSet } from './actions/set.js';
import type {
ActionPrepareCallback,
ActionsExecutionRequest,
ActionsExecutor,
} from './types.js';
import type { ActionsExecutionRequest, ActionsExecutor } from './types.js';
const INTERACTIONS = ['tap', 'double_tap', 'hold', 'start_tap', 'end_tap'] as const;
export type InteractionName = (typeof INTERACTIONS)[number];
@@ -38,11 +32,9 @@ export class ActionsManager implements ActionsExecutor {
private _api: CardActionsManagerAPI;
private _actionsInFlight: ActionSet[] = [];
private _actionContext: ActionContext = {};
private _templateRenderer: TemplateRenderer | null;
constructor(api: CardActionsManagerAPI, templateRenderer?: TemplateRenderer) {
constructor(api: CardActionsManagerAPI) {
this._api = api;
this._templateRenderer = templateRenderer ?? null;
}
/**
@@ -120,8 +112,13 @@ export class ActionsManager implements ActionsExecutor {
await this.executeActions(
{ actions: action },
// Elements rendered by this card will already have rendered templates.
true,
// Don't render templates: the picture-elements chain (which may contain
// third-party elements we don't control) is rendered wholesale when the
// elements are built, so this action's templates are already resolved.
// Rendering again would re-evaluate any `{{ }}` that a first render
// produced.
false,
);
};
@@ -140,63 +137,54 @@ export class ActionsManager implements ActionsExecutor {
await allPromises(this._actionsInFlight, (actionSet) => actionSet.stop());
}
// The top-level entry point for running actions: it runs them and emits the
// user feedback (the haptic) for the gesture. Actions that run further
// actions (e.g. `if`, `generated_action`) must use `executeNestedActions`.
public async executeActions(
request: ActionsExecutionRequest,
renderTemplates = true,
): Promise<void> {
// Lock filtering and the factory both classify on the raw (unrendered)
// discriminator (`action` / `advanced_camera_card_action`). A templated
// `advanced_camera_card_action` (permitted only by the loose custom-action
// schema) is left unresolved, matches no action type, and is dropped.
const allowedActions = this._api.getLockManager().getAllowedActions(request.actions);
if (!allowedActions.length) {
return;
}
// Each action prepares itself (via Action.prepare) just before it runs, so
// it observes what an earlier action may have changed. Skip when the caller
// opts out (the templates are already rendered) or there is no renderer.
const renderer = this._templateRenderer;
const actionPrepareCallback =
renderTemplates && renderer
? this._createActionPrepareCallback(renderer, request.triggerData)
: undefined;
const actionSet = new ActionSet(this._actionContext, allowedActions, {
factoryOptions: {
config: request.config,
cardID: this._api.getConfigManager().getConfig()?.card_id,
triggerData: request?.triggerData,
},
actionPrepareCallback,
});
this._actionsInFlight.push(actionSet);
try {
await actionSet.execute(this._api);
forwardHaptic('success');
// Only give success feedback when an action actually ran, so a gesture
// that did nothing (everything lock-filtered, or no action matched) stays
// silent.
if (await this._runActions(request, renderTemplates)) {
forwardHaptic('success');
}
} catch (e) {
errorToConsole(e);
forwardHaptic('warning');
}
this._actionsInFlight = this._actionsInFlight.filter((a) => a !== actionSet);
}
private _createActionPrepareCallback(
renderer: TemplateRenderer,
triggerData?: TriggerData,
): ActionPrepareCallback {
// Render against the state (incl. HASS) as it is *when the action runs* --
// fixed trigger context, fresh card/HASS state per step.
return <T>(value: T): T => {
const hass = this._api.getHASSManager().getHASS();
return hass
? renderer.renderRecursivelyAsType(hass, value, {
conditionState: this._api.getConditionStateManager().getState(),
triggerData,
})
: value;
};
// Run actions as a nested part of an already-running action (e.g. an `if`
// branch, or the action a `generated_action` produces). Errors propagate to
// the top-level `executeActions` (i.e. there's no try/catch here
// intentionally).
public async executeNestedActions(request: ActionsExecutionRequest): Promise<void> {
await this._runActions(request, true);
}
private async _runActions(
request: ActionsExecutionRequest,
renderTemplates: boolean,
): Promise<boolean> {
const actionSet = new ActionSet(this._actionContext, request.actions, {
factoryOptions: {
config: request.config,
cardID: this._api.getConfigManager().getConfig()?.card_id,
triggerData: request.triggerData,
},
renderTemplates,
});
// Track the set in-flight (including nested sets) so `uninitialize` can
// stop long-running actions on teardown.
this._actionsInFlight.push(actionSet);
try {
return await actionSet.execute(this._api);
} finally {
this._actionsInFlight = this._actionsInFlight.filter((a) => a !== actionSet);
}
}
}
src/card-controller/actions/actions/generated-action.ts
+42
View File
@@ -0,0 +1,42 @@
import type { ActionContext } from 'action';
import type { TriggerData } from '../../../condition-trigger/triggers/types';
import type { GeneratedActionConfig } from '../../../config/schema/actions/custom/generated-action';
import type { AuxillaryActionConfig } from '../../../config/schema/actions/types';
import type { CardActionsAPI } from '../../types';
import { AdvancedCameraCardAction } from './base';
export class GeneratedAction extends AdvancedCameraCardAction<GeneratedActionConfig> {
private _triggerData?: TriggerData;
constructor(
context: ActionContext,
action: GeneratedActionConfig,
config?: AuxillaryActionConfig,
triggerData?: TriggerData,
) {
super(context, action, config);
this._triggerData = triggerData;
}
public async execute(api: CardActionsAPI): Promise<void> {
await super.execute(api);
// A null return means generate nothing (e.g. the firing trigger supplied no
// usable value).
const generated = this._getAction().generator({
api,
triggerData: this._triggerData,
});
if (!generated) {
return;
}
await api.getActionsManager().executeNestedActions({
actions: generated,
config: this._config,
triggerData: this._triggerData,
});
}
}
src/card-controller/actions/actions/if.ts
+2 -6
View File
@@ -6,7 +6,6 @@ import type {
AuxillaryActionConfig,
IfActionConfig,
} from '../../../config/schema/actions/types';
import { TemplateRenderer } from '../../templates/index';
import type { CardActionsAPI } from '../../types';
import type { ActionPrepareCallback } from '../types';
import { BaseAction } from './base';
@@ -41,7 +40,7 @@ export class IfAction extends BaseAction<IfActionConfig> {
await super.execute(api);
const action = this._getAction();
const evaluatorContext = { templateRenderer: new TemplateRenderer() };
const evaluatorContext = { templateRenderer: api.getTemplateManager() };
const state = api.getConditionStateManager().getState();
const conditionsHold = action.if.every(
(condition) =>
@@ -53,10 +52,7 @@ export class IfAction extends BaseAction<IfActionConfig> {
return;
}
// The branch renders per-step as it runs, so each action observes state an
// earlier branch action changed. The trigger data is forwarded so the
// branch can still resolve `trigger.*` templates.
await api.getActionsManager().executeActions({
await api.getActionsManager().executeNestedActions({
actions: branch,
config: this._config,
triggerData: this._triggerData,
src/card-controller/actions/actions/set.ts
+34 -7
View File
@@ -8,14 +8,15 @@ import type { ActionPrepareCallback } from '../types';
interface ActionSetOptions {
factoryOptions?: ActionFactoryOptions;
actionPrepareCallback?: ActionPrepareCallback;
renderTemplates?: boolean;
}
// A self-contained sequence of actions, executed in order.
export class ActionSet {
private _context: ActionContext;
private _actions: ActionConfig[];
private _factoryOptions?: ActionFactoryOptions;
private _actionPrepareCallback?: ActionPrepareCallback;
private _renderTemplates: boolean;
private _factory = new ActionFactory();
private _stopped = false;
@@ -26,12 +27,22 @@ export class ActionSet {
) {
this._context = context;
this._actions = arrayify(actions);
this._actionPrepareCallback = options?.actionPrepareCallback;
this._factoryOptions = options?.factoryOptions;
this._renderTemplates = options?.renderTemplates ?? true;
}
public async execute(api: CardActionsAPI): Promise<void> {
for (const action of this._actions) {
// Returns whether any action actually ran.
public async execute(api: CardActionsAPI): Promise<boolean> {
// Lock filtering and the factory both classify on the raw (unrendered)
// discriminator (`action` / `advanced_camera_card_action`) -- as in Home
// Assistant, i.e. you cannot template the action itself.
const allowedActions = api.getLockManager().getAllowedActions(this._actions);
const prepareCallback = this._renderTemplates
? this._createPrepareCallback(api)
: undefined;
let executed = false;
for (const action of allowedActions) {
if (this._stopped) {
break;
}
@@ -45,15 +56,31 @@ export class ActionSet {
// Prepare against the state as it is now, so an action observes what an
// earlier action in the sequence changed. A prepare error aborts the
// rest of the sequence (it propagates to the caller's handler).
if (this._actionPrepareCallback) {
concreteAction.prepare(this._actionPrepareCallback);
if (prepareCallback) {
concreteAction.prepare(prepareCallback);
}
await concreteAction.execute(api);
executed = true;
}
}
return executed;
}
public async stop(): Promise<void> {
this._stopped = true;
}
private _createPrepareCallback(api: CardActionsAPI): ActionPrepareCallback {
const triggerData = this._factoryOptions?.triggerData;
return <T>(value: T): T => {
const hass = api.getHASSManager().getHASS();
return hass
? api.getTemplateManager().renderRecursivelyAsType(hass, value, {
conditionState: api.getConditionStateManager().getState(),
triggerData,
})
: value;
};
}
}
src/card-controller/actions/factory.ts
+9
View File
@@ -1,6 +1,7 @@
import type { ActionContext } from 'action';
import type { TriggerData } from '../../condition-trigger/triggers/types';
import { GENERATED_ACTION } from '../../config/schema/actions/custom/generated-action';
import { INTERNAL_CALLBACK_ACTION } from '../../config/schema/actions/custom/internal';
import type {
ActionConfig,
@@ -20,6 +21,7 @@ import { DownloadAction } from './actions/download';
import { EffectAction } from './actions/effect';
import { ExpandAction } from './actions/expand';
import { FullscreenAction } from './actions/fullscreen';
import { GeneratedAction } from './actions/generated-action';
import { IfAction } from './actions/if';
import { InfoAction } from './actions/info';
import { InternalCallbackAction } from './actions/internal-callback';
@@ -199,6 +201,13 @@ export class ActionFactory {
return new SetReviewAction(context, action, options?.config);
case INTERNAL_CALLBACK_ACTION:
return new InternalCallbackAction(context, action, options?.config);
case GENERATED_ACTION:
return new GeneratedAction(
context,
action,
options?.config,
options?.triggerData,
);
}
// Reached when the discriminator is not a known action type -- e.g. a
src/card-controller/automations-manager.ts
+23 -2
View File
@@ -4,7 +4,6 @@ import { TriggersManager } from '../condition-trigger/triggers/manager.js';
import type { TriggerData } from '../condition-trigger/triggers/types.js';
import type { Automation, AutomationActions } from '../config/schema/automations.js';
import { localize } from '../localize/localize.js';
import { TemplateRenderer } from './templates/index.js';
import type { CardAutomationsAPI, TaggedAutomation } from './types.js';
const MAX_NESTED_AUTOMATION_EXECUTIONS = 10;
@@ -32,12 +31,13 @@ export class AutomationsManager {
}
public addAutomations(automations: TaggedAutomation[]): void {
const context = { templateRenderer: new TemplateRenderer() };
const context = { templateRenderer: this._api.getTemplateManager() };
for (const automation of automations) {
const triggers = new TriggersManager(
automation.triggers,
this._api.getConditionStateManager(),
this._api.getHASSManager(),
this._api.getTemplateManager(),
);
// The ongoing `conditions:` block is pull-evaluated at trigger time, so
@@ -49,6 +49,27 @@ export class AutomationsManager {
);
triggers.addListener((data) => this._execute(automation, conditions, data));
this._automations.set(automation, triggers);
// When the card is already initialized (e.g. a runtime automation
// addition via configuration override), subscribe immediately. For
// "static" automations the InitializationManager subscribes every
// automation once initialization completes so that the trigger evaluators
// baseline their initial pre-trigger value against a card whose template
// renderer has loaded.
if (this._api.getInitializationManager().isInitializedMandatory()) {
triggers.subscribe();
}
}
}
/**
* Subscribe every registered automation's triggers. Called by the
* InitializationManager when initialization completes (idempotent, so
* automations subscribed eagerly on a runtime config change are unaffected).
*/
public subscribe(): void {
for (const triggers of this._automations.values()) {
triggers.subscribe();
}
}
src/card-controller/config/config-manager.ts
+14
View File
@@ -16,6 +16,7 @@ import type { HomeAssistant } from '../../ha/types.js';
import { localize } from '../../localize/localize.js';
import { getParseError } from '../../utils/zod/parse-errors.js';
import { InitializationAspect } from '../initialization-manager.js';
import { TemplateManager } from '../templates';
import type { CardConfigAPI } from '../types.js';
import { ConfigParseError } from './error.js';
import { setAutomationsFromConfig } from './load-automations.js';
@@ -35,6 +36,13 @@ export class ConfigManager {
private _overriddenConfig: AdvancedCameraCardConfig | null = null;
private _rawConfig: RawAdvancedCameraCardConfig | null = null;
private _cardWideConfig: CardWideConfig | null = null;
// Whether the effective config contains a template, recomputed only when that
// config changes (see `_processOverrideConfig`). Lets callers (e.g.
// InitializationManager) decide whether the template renderer is needed
// without rescanning the whole config on every render.
private _hasTemplate = false;
private _overridesManager = new OverridesManager(() => this._processOverrideConfig());
constructor(api: CardConfigAPI) {
@@ -75,6 +83,10 @@ export class ConfigManager {
return this._overriddenConfig ?? this._config;
}
public hasTemplate(): boolean {
return this._hasTemplate;
}
public getCardWideConfig(): CardWideConfig | null {
return this._cardWideConfig;
}
@@ -129,6 +141,7 @@ export class ConfigManager {
this._overridesManager.set(
this._api.getConditionStateManager(),
this._api.getTemplateManager(),
this._config.overrides,
);
@@ -177,6 +190,7 @@ export class ConfigManager {
const previousConfig = this._overriddenConfig;
this._overriddenConfig = overriddenConfig;
this._hasTemplate = TemplateManager.dataContainsTemplate(overriddenConfig);
setFoldersFromConfig(this._api);
this._api.getStyleManager().updateFromConfig();
src/card-controller/config/load-control-entities.ts
+17 -4
View File
@@ -1,7 +1,11 @@
import { isEqual } from 'lodash-es';
import type { RemoteControlEntityPriority } from '../../config/schema/remote-control';
import { createCameraAction, createInternalCallbackAction } from '../../utils/action';
import {
createCameraAction,
createGeneratedAction,
createInternalCallbackAction,
} from '../../utils/action';
import type { CardActionsAPI, CardConfigLoaderAPI, TaggedAutomation } from '../types';
export const setRemoteControlEntityFromConfig = (api: CardConfigLoaderAPI) => {
@@ -72,7 +76,12 @@ export const setRemoteControlEntityFromConfig = (api: CardConfigLoaderAPI) => {
actions: [
cameraPriority === 'entity'
? // Set the currently selected camera to the state of the entity.
createCameraAction(`{{ hass.states["${cameraControlEntity}"].state }}`)
createGeneratedAction(({ api }) => {
const cameraID = api.getHASSManager().getHASS()?.states[
cameraControlEntity
]?.state;
return cameraID ? createCameraAction(cameraID) : null;
})
: // Set the selected option in the entity to the current camera ID.
createInternalCallbackAction(async (api: CardActionsAPI) => {
const camera = api.getViewManager().getView()?.camera ?? undefined;
@@ -89,8 +98,12 @@ export const setRemoteControlEntityFromConfig = (api: CardConfigLoaderAPI) => {
},
],
actions: [
// When the entity state changes, updated the selected option.
createCameraAction('{{ trigger.to_state.state }}'),
// When the entity state changes, select the camera named by the new
// state, using the exact value that caused the trigger.
createGeneratedAction(({ triggerData }) => {
const cameraID = triggerData?.to_state?.state;
return cameraID ? createCameraAction(cameraID) : null;
}),
],
tag: automationTag,
},
src/card-controller/config/overrides-manager.ts
+7 -1
View File
@@ -16,6 +16,7 @@ import {
import { localize } from '../../localize/localize';
import { AdvancedCameraCardError } from '../../types';
import { desparsifyArrays } from '../../utils/basic.js';
import type { TemplateRenderer } from '../templates';
type OverridesCallback = () => void;
@@ -40,12 +41,17 @@ export class OverridesManager {
public set(
stateManager: ConditionStateManagerReadonlyInterface,
templateRenderer: TemplateRenderer,
overrides?: Override[],
): void {
this._clear();
overrides?.forEach((override) => {
const manager = new ConditionsManager(override.conditions, stateManager);
const manager = new ConditionsManager(
override.conditions,
templateRenderer,
stateManager,
);
manager.addListener(this._callback);
this._overrides.set(override, manager);
});
src/card-controller/controller.ts
+7 -2
View File
@@ -40,7 +40,7 @@ import { PIPManager } from './pip-manager';
import { QueryStringManager } from './query-string-manager';
import { StatusBarItemManager } from './status-bar-item-manager';
import { StyleManager } from './style-manager';
import { TemplateRenderer } from './templates';
import { TemplateManager } from './templates';
import type {
CardActionsManagerAPI,
CardAutomationsAPI,
@@ -110,8 +110,9 @@ export class CardController
private _deviceRegistryManager = new DeviceRegistryManager(new DeviceCache());
private _entityRegistryManager = new EntityRegistryManagerLive(new EntityCache());
private _resolvedMediaCache = new ResolvedMediaCache();
private _templateManager = new TemplateManager();
private _actionsManager = new ActionsManager(this, new TemplateRenderer());
private _actionsManager = new ActionsManager(this);
private _automationsManager = new AutomationsManager(this);
private _callManager = new CallManager(this);
private _cameraManager = new CameraManager(this);
@@ -306,6 +307,10 @@ export class CardController
return this._styleManager;
}
public getTemplateManager(): TemplateManager {
return this._templateManager;
}
public getCameraTriggersManager(): CameraTriggersManager {
return this._cameraTriggersManager;
}
src/card-controller/folders/executor.ts
+3 -2
View File
@@ -8,6 +8,7 @@ import type { HomeAssistant } from '../../ha/types';
import type { Endpoint } from '../../types';
import type { ViewFolder, ViewItem } from '../../view/item';
import type { ViewItemCapabilities } from '../../view/types';
import type { TemplateRenderer } from '../templates';
import { sortItems } from '../view/sort';
import { HAFoldersEngine } from './ha/engine';
import type {
@@ -20,8 +21,8 @@ import type {
export class FoldersExecutor {
private _ha: FoldersEngine;
constructor(engines?: { ha?: HAFoldersEngine }) {
this._ha = engines?.ha ?? new HAFoldersEngine();
constructor(templateRenderer: TemplateRenderer, engines?: { ha?: HAFoldersEngine }) {
this._ha = engines?.ha ?? new HAFoldersEngine(templateRenderer);
}
public getDefaultQueryParameters(folder: FolderConfig): FolderQuery | null {
src/card-controller/folders/ha/engine.ts
+10 -6
View File
@@ -29,6 +29,7 @@ import type { Endpoint } from '../../../types';
import type { ViewFolder, ViewItem } from '../../../view/item';
import { ViewItemClassifier } from '../../../view/item-classifier';
import type { ViewItemCapabilities } from '../../../view/types';
import type { TemplateRenderer } from '../../templates';
import type {
DownloadHelpers,
EngineOptions,
@@ -46,14 +47,17 @@ export class HAFoldersEngine implements FoldersEngine {
private _metadataGenerator: MetadataGenerator;
private _mediaMatcher: MediaMatcher;
public constructor(options?: {
browseMediaManager?: BrowseMediaWalker;
metadataGenerator?: MetadataGenerator;
mediaMatcher?: MediaMatcher;
}) {
public constructor(
templateRenderer: TemplateRenderer,
options?: {
browseMediaManager?: BrowseMediaWalker;
metadataGenerator?: MetadataGenerator;
mediaMatcher?: MediaMatcher;
},
) {
this._browseMediaManager = options?.browseMediaManager ?? new BrowseMediaWalker();
this._metadataGenerator = options?.metadataGenerator ?? new MetadataGenerator();
this._mediaMatcher = options?.mediaMatcher ?? new MediaMatcher();
this._mediaMatcher = options?.mediaMatcher ?? new MediaMatcher(templateRenderer);
}
public getItemCapabilities(item: ViewItem): ViewItemCapabilities | null {
src/card-controller/folders/ha/media-matcher.ts
+6 -2
View File
@@ -14,11 +14,15 @@ import type {
} from '../../../ha/browse-media/types';
import type { HomeAssistant } from '../../../ha/types';
import { regexpExtract } from '../../../utils/regexp-extract';
import { TemplateRenderer } from '../../templates';
import type { TemplateRenderer } from '../../templates';
import { REGEXP_GROUP_VALUE_KEY } from './types';
export class MediaMatcher {
private _templateRenderer = new TemplateRenderer();
private _templateRenderer: TemplateRenderer;
constructor(templateRenderer: TemplateRenderer) {
this._templateRenderer = templateRenderer;
}
public match(
hass: HomeAssistant,
src/card-controller/folders/manager.ts
+1 -1
View File
@@ -23,7 +23,7 @@ export class FoldersManager {
constructor(api: CardFoldersAPI, executor?: FoldersExecutor) {
this._api = api;
this._executor = executor ?? new FoldersExecutor();
this._executor = executor ?? new FoldersExecutor(this._api.getTemplateManager());
}
public deleteFolders(): void {
src/card-controller/initialization-manager.ts
+20
View File
@@ -13,6 +13,7 @@ export enum InitializationAspect {
SIDE_LOAD_ELEMENTS = 'side-load-elements',
CAMERAS = 'cameras',
MICROPHONE_CONNECT = 'microphone-connect',
TEMPLATE_RENDERER = 'template-renderer',
VIEW = 'view',
// The initial triggering must happen after both the config is set (and
@@ -67,6 +68,9 @@ export class InitializationManager {
...(this._api.getMicrophoneManager().shouldConnectOnInitialization()
? [InitializationAspect.MICROPHONE_CONNECT]
: []),
...(this._api.getConfigManager().hasTemplate()
? [InitializationAspect.TEMPLATE_RENDERER]
: []),
InitializationAspect.VIEW,
InitializationAspect.INITIAL_TRIGGER,
]);
@@ -166,6 +170,14 @@ export class InitializationManager {
await this._api.getMicrophoneManager().connect();
},
}),
// Unrendered templates could cause correctness issues -- ensure the
// template rendered is loaded before it is needed.
...(this._api.getConfigManager().hasTemplate() && {
[InitializationAspect.TEMPLATE_RENDERER]: async () => {
await this._api.getTemplateManager().loadRenderer();
},
}),
}),
))
) {
@@ -201,6 +213,13 @@ export class InitializationManager {
this._everInitialized = true;
// Subscribe any automations now: the template renderer (a mandatory
// automation trigger evaluators can baseline pre-trigger (which potentially
// involves rendering templates). This must run before the `setState` below
// so that triggers watching `config`/`initialized` are attached in time to
// fire on *that* very change.
this._api.getAutomationsManager().subscribe();
// When the card is initialized, both the initialization state (will never
// change again), and the config are set in the condition state. The
// config is set here, rather than in the ConfigManager, in order to
@@ -245,6 +264,7 @@ export class InitializationManager {
for (const aspect of [
InitializationAspect.CAMERAS,
InitializationAspect.MICROPHONE_CONNECT,
InitializationAspect.TEMPLATE_RENDERER,
InitializationAspect.VIEW,
InitializationAspect.INITIAL_TRIGGER,
]) {
src/card-controller/templates/index.ts
+84 -4
View File
@@ -1,4 +1,4 @@
import { renderTemplate, type HASS } from 'ha-nunjucks/dist';
import type { renderTemplate } from 'ha-nunjucks/dist';
import type { ConditionState } from '../../condition-trigger/conditions/types';
import type { TriggerData } from '../../condition-trigger/triggers/types';
@@ -6,6 +6,8 @@ import type { HomeAssistant } from '../../ha/types';
import { isRecord } from '../../utils/basic';
import type { TemplateACCNamespace, TemplateMediaData } from './types';
type RenderTemplate = typeof renderTemplate;
interface TemplateContext {
acc: TemplateACCNamespace;
@@ -19,7 +21,58 @@ interface TemplateRenderOptions {
mediaData?: TemplateMediaData;
}
export class TemplateRenderer {
// The template-rendering methods that callers depend on. Callers (e.g.
// condition/trigger code) are kept independent of CardController via this
// interface.
export interface TemplateRenderer {
// Whether the renderer has finished loading. Synchronous callers that may run
// before loading completes (condition/trigger evaluation) check this and
// defer rather than rendering a template against an absent renderer.
isLoaded(): boolean;
renderRecursively(
hass: HomeAssistant,
data: unknown,
options?: TemplateRenderOptions,
): unknown;
renderRecursivelyAsType<T>(
hass: HomeAssistant,
data: T,
options?: TemplateRenderOptions,
): T;
}
// Renders nunjucks templates for the card. The renderer itself (`ha-nunjucks`,
// ~272KB) is large and most cards never use a template, so it is imported on
// demand the first time a template needs rendering (see `loadRenderer`).
export class TemplateManager implements TemplateRenderer {
private _renderer: RenderTemplate | null = null;
/**
* Whether any string anywhere in a given piece of data is a template.
*/
public static dataContainsTemplate(data: unknown): boolean {
return TemplateManager._containsTemplate(JSON.stringify(data) ?? '');
}
/**
* Load the renderer (the first time) and remember it. Repeat calls return
* immediately once loaded; a failed load is not cached, so a later call
* retries. Concurrent calls share a single load via the module cache.
*/
public async loadRenderer(): Promise<void> {
if (this._renderer) {
return;
}
const module = await import('ha-nunjucks/dist');
this._renderer = module.renderTemplate;
}
public isLoaded(): boolean {
return !!this._renderer;
}
public renderRecursively = (
hass: HomeAssistant,
data: unknown,
@@ -75,10 +128,23 @@ export class TemplateRenderer {
templateContext?: TemplateContext,
): unknown {
if (typeof data === 'string') {
return renderTemplate(
if (!TemplateManager._containsTemplate(data)) {
return data;
}
if (!this._renderer) {
// A defensive guard that should not be reached: the renderer is loaded
// during mandatory initialization before the view, triggers, or actions
// render, and the condition/trigger evaluators that can run earlier
// check `isLoaded()` first and defer rather than calling in here.
this.loadRenderer().catch(() => {});
return data;
}
return this._renderer(
// ha-nunjucks has a more complete model of the Home Assistant object, but
// does not export it as a type.
hass as unknown as typeof HASS,
hass as unknown as Parameters<RenderTemplate>[0],
data,
templateContext,
);
@@ -95,4 +161,18 @@ export class TemplateRenderer {
}
return data;
}
/**
* Whether a string contains a nunjucks template that needs rendering. It does
* only if it has a matching pair of markers (`{{ … }}` or `{% … %}`); this is
* the same check `ha-nunjucks` makes, so a string without them renders the
* same whether or not the renderer has loaded -- which is what lets a card
* that uses no templates avoid loading the renderer at all.
*/
private static _containsTemplate(value: string): boolean {
return (
(value.includes('{{') && value.includes('}}')) ||
(value.includes('{%') && value.includes('%}'))
);
}
}
src/card-controller/templates/renderer-via-event.ts
+28
View File
@@ -0,0 +1,28 @@
import type { TemplateRenderer } from './index';
export class TemplateRendererGetEvent extends Event {
public templateRenderer?: TemplateRenderer;
constructor(eventInitDict?: EventInit) {
super('advanced-camera-card:template-renderer:get', eventInitDict);
}
}
/**
* Fetch the card's TemplateRenderer by dispatching an event that bubbles up to
* the card, which fills in the answer before the call returns. A last resort
* for elements (e.g. `<advanced-camera-card-conditional>`) that may be nested
* below DOM layers the card does not control and so cannot be handed the
* renderer directly via a property.
* @returns The TemplateRenderer, or null if nothing answered.
*/
export function getTemplateRendererViaEvent(
element: HTMLElement,
): TemplateRenderer | null {
const getEvent = new TemplateRendererGetEvent({
bubbles: true,
composed: true,
});
element.dispatchEvent(getEvent);
return getEvent.templateRenderer ?? null;
}
src/card-controller/types.ts
+7
View File
@@ -30,6 +30,7 @@ import type { PIPManager } from './pip-manager';
import type { QueryStringManager } from './query-string-manager';
import type { StatusBarItemManager } from './status-bar-item-manager';
import type { StyleManager } from './style-manager';
import type { TemplateManager } from './templates';
import type { ViewItemManager } from './view/item-manager';
import type { ViewManager } from './view/view-manager';
@@ -62,6 +63,7 @@ export interface CardActionsAPI {
getIssueManager(): IssueManager;
getStatusBarItemManager(): StatusBarItemManager;
getCameraTriggersManager(): CameraTriggersManager;
getTemplateManager(): TemplateManager;
getViewItemManager(): ViewItemManager;
getViewManager(): ViewManager;
}
@@ -75,6 +77,7 @@ export interface CardAutomationsAPI {
getInitializationManager(): InitializationManager;
getNotificationManager(): NotificationManager;
getIssueManager(): IssueManager;
getTemplateManager(): TemplateManager;
}
export interface CardCallAPI {
@@ -123,6 +126,7 @@ export interface CardConfigAPI {
getIssueManager(): IssueManager;
getStatusBarItemManager(): StatusBarItemManager;
getStyleManager(): StyleManager;
getTemplateManager(): TemplateManager;
getViewManager(): ViewManager;
}
@@ -184,6 +188,7 @@ export interface CardFoldersAPI {
getConfigManager(): ConfigManager;
getHASSManager(): HASSManager;
getResolvedMediaCache(): ResolvedMediaCache;
getTemplateManager(): TemplateManager;
}
export interface CardFullscreenAPI {
@@ -220,6 +225,7 @@ export interface CardInitializerAPI {
createMicrophoneManager(): void;
getMicrophoneManager(): MicrophoneManager;
getAutomationsManager(): AutomationsManager;
getCardElementManager(): CardElementManager;
getConditionStateManager(): ConditionStateManager;
getConfigManager(): ConfigManager;
@@ -231,6 +237,7 @@ export interface CardInitializerAPI {
getQueryStringManager(): QueryStringManager;
getResolvedMediaCache(): ResolvedMediaCache;
getCameraTriggersManager(): CameraTriggersManager;
getTemplateManager(): TemplateManager;
getViewManager(): ViewManager;
}
src/card.ts
+14 -2
View File
@@ -43,6 +43,7 @@ import './components/status-bar';
import './components/thumbnail-carousel.js';
import './components/views.js';
import type { TemplateRendererGetEvent } from './card-controller/templates/renderer-via-event.js';
import type { AdvancedCameraCardViews } from './components/views.js';
import type { ConditionStateManagerGetEvent } from './condition-trigger/conditions/state-manager-via-event.js';
import type { StatusBarItem } from './config/schema/actions/types.js';
@@ -483,14 +484,20 @@ class AdvancedCameraCard extends LitElement {
${fullCardIssue ? renderNotificationBlock(fullCardIssue.notification) : ''}
</div>
${this._renderMenuStatusContainer('bottom')}
${this._config?.elements
${this._config?.elements &&
this._controller.getInitializationManager().isInitializedMandatory()
? // Elements need to render after the main views so it can render 'on
// top'.
// top'. They are held until the card is initialized: the template
// renderer loads lazily as a mandatory init aspect (when the
// config uses templates), so rendering elements earlier could
// emit raw, unrendered templates or evaluate their visibility
// conditions before the renderer is available.
html` <advanced-camera-card-elements
${ref(this._refElements)}
.hass=${this._hass}
.elements=${this._config?.elements}
.conditionStateManager=${this._controller.getConditionStateManager()}
.templateRenderer=${this._controller.getTemplateManager()}
@advanced-camera-card:menu:add=${(ev: CustomEvent<MenuItem>) => {
this._menuButtonController.addDynamicMenuButton(ev.detail);
this.requestUpdate();
@@ -518,6 +525,11 @@ class AdvancedCameraCard extends LitElement {
) => {
ev.conditionStateManager = this._controller.getConditionStateManager();
}}
@advanced-camera-card:template-renderer:get=${(
ev: TemplateRendererGetEvent,
) => {
ev.templateRenderer = this._controller.getTemplateManager();
}}
>
</advanced-camera-card-elements>`
: ``}
src/components/elements.ts
+20 -10
View File
@@ -10,7 +10,8 @@ import { customElement, property, state } from 'lit/decorators.js';
import { isEqual } from 'lodash-es';
import type { IssueTriggerEventData } from '../card-controller/issues/types.js';
import { TemplateRenderer } from '../card-controller/templates/index.js';
import type { TemplateRenderer } from '../card-controller/templates/index.js';
import { getTemplateRendererViaEvent } from '../card-controller/templates/renderer-via-event.js';
import { ConditionsManager } from '../condition-trigger/conditions/conditions-manager.js';
import { getConditionStateManagerViaEvent } from '../condition-trigger/conditions/state-manager-via-event.js';
import type { ConditionStateManager } from '../condition-trigger/conditions/state-manager.js';
@@ -93,11 +94,13 @@ export class AdvancedCameraCardElementsCore extends LitElement {
@property({ attribute: false })
public conditionStateManager?: ConditionStateManager;
@property({ attribute: false })
public templateRenderer?: TemplateRenderer;
@state()
private _root: HuiConditionalElement | null = null;
private _renderedElements?: PictureElements;
private _templateRenderer = new TemplateRenderer();
/**
* Create a transparent render root.
@@ -137,13 +140,11 @@ export class AdvancedCameraCardElementsCore extends LitElement {
return;
}
const elements = this._templateRenderer.renderRecursivelyAsType(
this.hass,
this.elements,
{
conditionState: this.conditionStateManager?.getState(),
},
);
const elements = this.templateRenderer
? this.templateRenderer.renderRecursivelyAsType(this.hass, this.elements, {
conditionState: this.conditionStateManager?.getState(),
})
: this.elements;
// Condition state changes won't change the actual rendered config unless
// `elements` has a template, which is more likely does not. Avoid updating
@@ -216,6 +217,9 @@ export class AdvancedCameraCardElements extends LitElement {
@property({ attribute: false })
public conditionStateManager?: ConditionStateManager;
@property({ attribute: false })
public templateRenderer?: TemplateRenderer;
private _addHandler(
target: EventTarget,
eventName: string,
@@ -298,6 +302,7 @@ export class AdvancedCameraCardElements extends LitElement {
.conditionStateManager=${this.conditionStateManager}
.hass=${this.hass}
.elements=${this.elements}
.templateRenderer=${this.templateRenderer}
>
</advanced-camera-card-elements-core>`;
}
@@ -316,6 +321,7 @@ export class AdvancedCameraCardElements extends LitElement {
export class AdvancedCameraCardElementsConditional extends LitElement {
private _config?: AdvancedCameraCardConditional;
private _conditionManager: ConditionsManager | null = null;
private _templateRenderer: TemplateRenderer | null = null;
// A note on hass as an update mechanism:
//
@@ -361,12 +367,15 @@ export class AdvancedCameraCardElementsConditional extends LitElement {
private _createConditionManager(): void {
const conditionStateManager = getConditionStateManagerViaEvent(this);
if (!this._config || !conditionStateManager) {
const templateRenderer = getTemplateRendererViaEvent(this);
if (!this._config || !conditionStateManager || !templateRenderer) {
return;
}
this._templateRenderer = templateRenderer;
this._conditionManager?.destroy();
this._conditionManager = new ConditionsManager(
this._config.conditions,
templateRenderer,
conditionStateManager,
);
this._conditionManager.addListener(() => this.requestUpdate());
@@ -377,6 +386,7 @@ export class AdvancedCameraCardElementsConditional extends LitElement {
return html` <advanced-camera-card-elements-core
.hass=${this.hass}
.elements=${this._config?.elements}
.templateRenderer=${this._templateRenderer}
>
</advanced-camera-card-elements-core>`;
}
src/condition-trigger/common/is-enabled.ts
+9 -8
View File
@@ -5,16 +5,17 @@ import type { ConditionState } from '../conditions/types';
// `vol.Any(boolean, template)`): a boolean, or a template rendered against the
// current state. Returns whether the trigger/condition is active.
//
// `enabledWithoutHass` is the fallback when a template `enabled` cannot be
// rendered (no hass yet, e.g. at startup). It differs by caller because
// "disabled" has opposite consequences: a disabled *trigger* simply does not
// fire (so triggers fail closed -- pass `false`), whereas a disabled
// *condition* is skipped (so the condition may evaluate to `true`)
// `fallback` is the result used when a template `enabled` cannot be rendered
// (no hass yet, or the renderer has not finished loading -- both happen at
// startup). It differs by caller because "disabled" has opposite consequences:
// a disabled *trigger* simply does not fire (so triggers fail closed -- pass
// `false`), whereas a disabled *condition* is skipped (so the condition may
// evaluate to `true`).
export const isEnabled = (
templateRenderer: TemplateRenderer,
enabled?: boolean | string,
state?: ConditionState,
enabledWithoutHass = true,
fallback = true,
): boolean => {
if (enabled === undefined) {
return true;
@@ -22,8 +23,8 @@ export const isEnabled = (
if (typeof enabled === 'boolean') {
return enabled;
}
if (!state?.hass) {
return enabledWithoutHass;
if (!state?.hass || !templateRenderer.isLoaded()) {
return fallback;
}
return (
templateRenderer.renderRecursively(state.hass, enabled, {
src/condition-trigger/common/numeric-state.ts
+5
View File
@@ -22,6 +22,11 @@ export const readNumericStateValue = (
let rawValue: unknown;
if (config.value_template) {
// Until the renderer has loaded the template cannot be evaluated; treat as
// non-numeric (so the match fails) rather than parsing a raw `{{…}}`.
if (!templateRenderer.isLoaded()) {
return null;
}
rawValue = templateRenderer.renderRecursively(hass, config.value_template, {
conditionState: state,
});
src/condition-trigger/conditions/conditions-manager.ts
+5 -3
View File
@@ -1,4 +1,4 @@
import { TemplateRenderer } from '../../card-controller/templates';
import type { TemplateRenderer } from '../../card-controller/templates';
import type { Condition } from '../../config/schema/condition-trigger/conditions/types';
import { isEnabled } from '../common/is-enabled';
import type {
@@ -27,7 +27,7 @@ interface ManagedCondition {
*/
export class ConditionsManager implements ConditionsManagerReadonlyInterface {
private _stateManager: ConditionStateManagerReadonlyInterface | null;
private _templateRenderer = new TemplateRenderer();
private _templateRenderer: TemplateRenderer;
private _conditions: ManagedCondition[];
private _listeners: ConditionsListener[] = [];
@@ -36,9 +36,11 @@ export class ConditionsManager implements ConditionsManagerReadonlyInterface {
constructor(
conditions: Condition[],
templateRenderer: TemplateRenderer,
stateManager?: ConditionStateManagerReadonlyInterface | null,
) {
const context = { templateRenderer: this._templateRenderer };
this._templateRenderer = templateRenderer;
const context = { templateRenderer };
this._conditions = conditions.map((config) => ({
config,
evaluator: createConditionEvaluator(config, context),
src/condition-trigger/conditions/conditions/template.ts
+3
View File
@@ -15,6 +15,9 @@ export class TemplateConditionEvaluator implements ConditionEvaluator {
return {
result:
!!newState?.hass &&
// Until the renderer has loaded the template cannot be evaluated; fail
// (rather than render a raw `{{…}}`), and re-evaluate once it loads.
this._context.templateRenderer.isLoaded() &&
isTemplateTrue(
this._context.templateRenderer.renderRecursively(
newState.hass,
src/condition-trigger/triggers/manager.ts
+17 -4
View File
@@ -1,5 +1,5 @@
import type { HASSManagerReadonlyInterface } from '../../card-controller/hass/types';
import { TemplateRenderer } from '../../card-controller/templates';
import type { TemplateRenderer } from '../../card-controller/templates';
import type { Trigger } from '../../config/schema/condition-trigger/triggers/types';
import { isEnabled } from '../common/is-enabled';
import type { ConditionStateManagerReadonlyInterface } from '../conditions/types';
@@ -27,27 +27,40 @@ export class TriggersManager {
private _context: TriggerEvaluatorContext;
private _triggers: ManagedTrigger[];
private _listeners: TriggerCallback[] = [];
private _subscribed = false;
constructor(
triggers: Trigger[],
stateManager: ConditionStateManagerReadonlyInterface,
hassManager: HASSManagerReadonlyInterface,
templateRenderer: TemplateRenderer,
) {
this._context = {
stateManager,
templateRenderer: new TemplateRenderer(),
templateRenderer,
hassManager,
};
this._triggers = triggers.map((config) => ({
config,
evaluator: createTriggerEvaluator(config, this._context),
}));
}
/**
* Subscribe the evaluators to the state manager, establishing their
* pre-trigger baselines.
*/
public subscribe(): void {
if (this._subscribed) {
return;
}
this._subscribed = true;
// `enabled` is a live per-trigger gate (re-evaluated each time), UNLIKE
// HA's once-at-attach: a deliberate deviation to allow dynamic triggering.
this._triggers.forEach(({ config, evaluator }) =>
evaluator.subscribe((data) => {
if (
// `enabled` is a live per-trigger gate (re-evaluated each time), UNLIKE
// HA's once-at-attach: a deliberate deviation to allow dynamic triggering.
isEnabled(
this._context.templateRenderer,
config.enabled,
src/condition-trigger/triggers/triggers/template.ts
+3
View File
@@ -69,6 +69,9 @@ export class TemplateTrigger implements TriggerEvaluator {
private _render(state: ConditionState): boolean {
return (
!!state.hass &&
// Until the renderer has loaded the template cannot be evaluated; report
// not-true (matching a raw render) so no false rising edge is recorded.
this._context.templateRenderer.isLoaded() &&
isTemplateTrue(
this._context.templateRenderer.renderRecursively(
state.hass,
src/config/schema/actions/custom/generated-action.ts
+31
View File
@@ -0,0 +1,31 @@
import { z } from 'zod';
import type { CardActionsAPI } from '../../../../card-controller/types';
import type { TriggerData } from '../../../../condition-trigger/triggers/types';
import type { ActionConfig } from '../types';
import { advancedCameraCardCustomActionsBaseSchema } from './base';
interface GeneratedActionContext {
api: CardActionsAPI;
triggerData?: TriggerData;
}
// Returns the action(s) to run, or null to generate nothing.
export type ActionGenerator = (
context: GeneratedActionContext,
) => ActionConfig | ActionConfig[] | null;
// An internal action (not user-configurable) that, when executed, generates and
// runs a concrete action
export const GENERATED_ACTION = '__GENERATED_ACTION__';
export const generatedActionConfigSchema =
advancedCameraCardCustomActionsBaseSchema.extend({
advanced_camera_card_action: z.literal(GENERATED_ACTION),
// Validated with z.custom rather than z.function (which internal_callback's
// callback uses) because the return type is an action config: typing it via
// z.function would require importing actionConfigSchema from the module
// that imports this one, a circular import.
generator: z.custom<ActionGenerator>((value) => typeof value === 'function'),
});
export type GeneratedActionConfig = z.infer<typeof generatedActionConfigSchema>;
src/config/schema/actions/types.ts
+2
View File
@@ -14,6 +14,7 @@ import { cameraSelectActionConfigSchema } from './custom/camera-select';
import { viewDisplayModeActionConfigSchema } from './custom/display-mode';
import { effectActionConfigSchema } from './custom/effect';
import { generalActionConfigSchema } from './custom/general';
import { generatedActionConfigSchema } from './custom/generated-action';
import { internalCallbackActionConfigSchema } from './custom/internal';
import { logActionConfigSchema } from './custom/log';
import { mediaPlayerActionConfigSchema } from './custom/media-player';
@@ -79,6 +80,7 @@ const advancedCameraCardCustomActionSchema = z.union([
cameraSelectActionConfigSchema,
effectActionConfigSchema,
generalActionConfigSchema,
generatedActionConfigSchema,
internalCallbackActionConfigSchema,
logActionConfigSchema,
mediaPlayerActionConfigSchema,
src/utils/action.ts
+18
View File
@@ -13,6 +13,11 @@ import type {
AdvancedCameraCardGeneralAction,
GeneralActionConfig,
} from '../config/schema/actions/custom/general.js';
import {
GENERATED_ACTION,
type ActionGenerator,
type GeneratedActionConfig,
} from '../config/schema/actions/custom/generated-action.js';
import {
INTERNAL_CALLBACK_ACTION,
type InternalCallbackActionConfig,
@@ -91,6 +96,19 @@ export function createCameraAction(
};
}
// An internal action that generates concrete action(s) when it runs. Used by
// code-built automations that only know a value -- e.g. a camera id -- when the
// action actually fires.
export function createGeneratedAction(
generator: ActionGenerator,
): GeneratedActionConfig {
return {
action: 'fire-dom-event',
advanced_camera_card_action: GENERATED_ACTION,
generator,
};
}
export function createSubstreamOnAction(options?: {
stream?: string;
camera?: string;