jiti-meet/react/features/mobile/image-cache/middleware.js

87 lines
2.5 KiB
JavaScript

/* @flow */
import { ImageCache } from 'react-native-img-cache';
import { APP_WILL_MOUNT } from '../../app';
import { CONFERENCE_FAILED, CONFERENCE_LEFT } from '../../base/conference';
import {
getAvatarURL,
getLocalParticipant,
getParticipantById,
PARTICIPANT_ID_CHANGED,
PARTICIPANT_JOINED,
PARTICIPANT_UPDATED
} from '../../base/participants';
import { MiddlewareRegistry } from '../../base/redux';
import { prefetch } from '../../mobile/image-cache';
/**
* The indicator which determines whether avatar URLs are to be prefetched in
* the middleware here. Unless/until the implementation starts observing the
* redux store instead of the respective redux actions, the value should very
* likely be <tt>false</tt> because the middleware here is pretty much the last
* to get a chance to figure out that an avatar URL may be used. Besides, it is
* somewhat uninformed to download just about anything that may eventually be
* used or not.
*
* @private
* @type {boolean}
*/
const _PREFETCH_AVATAR_URLS = false;
/**
* Middleware which captures app startup and conference actions in order to
* clear the image cache.
*
* @returns {Function}
*/
MiddlewareRegistry.register(({ getState }) => next => action => {
switch (action.type) {
case APP_WILL_MOUNT:
case CONFERENCE_FAILED:
case CONFERENCE_LEFT:
ImageCache.get().clear();
break;
case PARTICIPANT_ID_CHANGED:
case PARTICIPANT_JOINED:
case PARTICIPANT_UPDATED: {
if (!_PREFETCH_AVATAR_URLS) {
break;
}
const result = next(action);
// Initiate the downloads of participants' avatars as soon as possible.
// 1. Figure out the participant (instance).
let { participant } = action;
if (participant) {
if (participant.id) {
participant = getParticipantById(getState, participant.id);
} else if (participant.local) {
participant = getLocalParticipant(getState);
} else {
participant = undefined;
}
} else if (action.oldValue && action.newValue) {
participant = getParticipantById(getState, action.newValue);
}
if (participant) {
// 2. Get the participant's avatar URL.
const uri = getAvatarURL(participant);
if (uri) {
// 3. Initiate the download of the participant's avatar.
prefetch({ uri });
}
}
return result;
}
}
return next(action);
});