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98 lines
3.0 KiB
98 lines
3.0 KiB
import { ObservableStore } from '@metamask/obs-store';
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import { getPersistentState } from '@metamask/controllers';
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/**
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* @typedef {import('@metamask/controllers').ControllerMessenger} ControllerMessenger
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*/
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/**
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* An ObservableStore that can composes a flat
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* structure of child stores based on configuration
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*/
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export default class ComposableObservableStore extends ObservableStore {
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/**
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* Describes which stores are being composed. The key is the name of the
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* store, and the value is either an ObserableStore, or a controller that
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* extends one of the two base controllers in the `@metamask/controllers`
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* package.
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*
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* @type {Record<string, Object>}
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*/
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config = {};
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/**
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* Create a new store
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*
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* @param {Object} options
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* @param {Object} [options.config] - Map of internal state keys to child stores
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* @param {ControllerMessenger} options.controllerMessenger - The controller
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* messenger, used for subscribing to events from BaseControllerV2-based
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* controllers.
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* @param {Object} [options.state] - The initial store state
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* @param {boolean} [options.persist] - Whether or not to apply the persistence for v2 controllers
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*/
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constructor({ config, controllerMessenger, state, persist }) {
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super(state);
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this.persist = persist;
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this.controllerMessenger = controllerMessenger;
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if (config) {
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this.updateStructure(config);
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}
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}
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/**
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* Composes a new internal store subscription structure
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*
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* @param {Record<string, Object>} config - Describes which stores are being
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* composed. The key is the name of the store, and the value is either an
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* ObserableStore, or a controller that extends one of the two base
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* controllers in the `@metamask/controllers` package.
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*/
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updateStructure(config) {
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this.config = config;
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this.removeAllListeners();
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for (const key of Object.keys(config)) {
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if (!config[key]) {
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throw new Error(`Undefined '${key}'`);
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}
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const store = config[key];
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if (store.subscribe) {
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config[key].subscribe((state) => {
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this.updateState({ [key]: state });
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});
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} else {
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this.controllerMessenger.subscribe(
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`${store.name}:stateChange`,
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(state) => {
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let updatedState = state;
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if (this.persist) {
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updatedState = getPersistentState(state, config[key].metadata);
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}
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this.updateState({ [key]: updatedState });
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},
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);
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}
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}
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}
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/**
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* Merges all child store state into a single object rather than
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* returning an object keyed by child store class name
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*
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* @returns {Object} Object containing merged child store state
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*/
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getFlatState() {
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if (!this.config) {
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return {};
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}
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let flatState = {};
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for (const key of Object.keys(this.config)) {
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const controller = this.config[key];
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const state = controller.getState
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? controller.getState()
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: controller.state;
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flatState = { ...flatState, ...state };
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}
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return flatState;
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}
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}
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