57 lines
2.1 KiB
JavaScript
57 lines
2.1 KiB
JavaScript
// @flow
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import isEqual from 'util/deep-equal';
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import { doPreferenceSet } from 'redux/actions/sync';
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const RUN_PREFERENCES_DELAY_MS = 2000;
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const SHARED_PREFERENCE_VERSION = '0.1';
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let oldShared = {};
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let timeout;
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export const buildSharedStateMiddleware = (
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actions: Array<string>,
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sharedStateFilters: {},
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sharedStateCb?: (any) => void
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) => ({ getState, dispatch }: { getState: () => { user: any, settings: any }, dispatch: (any) => void }) => (
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next: ({}) => void
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) => (action: { type: string, data: any }) => {
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// We don't care if sync is disabled here, we always want to backup preferences to the wallet
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if (!actions.includes(action.type) || typeof action === 'function') {
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return next(action);
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}
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clearTimeout(timeout);
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const actionResult = next(action);
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// Call `getState` after calling `next` to ensure the state has updated in response to the action
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function runPreferences() {
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const nextState: { user: any, settings: any } = getState();
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const syncEnabled =
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nextState.settings && nextState.settings.clientSettings && nextState.settings.clientSettings.enable_sync;
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const hasVerifiedEmail = nextState.user && nextState.user.user && nextState.user.user.has_verified_email;
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const preferenceKey = syncEnabled && hasVerifiedEmail ? 'shared' : 'local';
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const shared = {};
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Object.keys(sharedStateFilters).forEach((key) => {
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const filter = sharedStateFilters[key];
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const { source, property, transform } = filter;
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let value = nextState[source][property];
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if (transform) {
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value = transform(value);
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}
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shared[key] = value;
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});
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if (!isEqual(oldShared, shared)) {
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// only update if the preference changed from last call in the same session
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oldShared = shared;
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dispatch(doPreferenceSet(preferenceKey, shared, SHARED_PREFERENCE_VERSION));
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}
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if (sharedStateCb) {
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// Pass dispatch to the callback to consumers can dispatch actions in response to preference set
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sharedStateCb({ dispatch, getState });
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}
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clearTimeout(timeout);
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return actionResult;
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}
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timeout = setTimeout(runPreferences, RUN_PREFERENCES_DELAY_MS);
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};
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