@amityco/ts-sdk-react-native/src/feedRepository/observers/getGlobalFeed/LiveCollectionController.ts

Amity Social Cloud Typescript SDK

import hash from 'object-hash';
import { pullFromCache, pushToCache } from '~/cache/api';
import { GlobalFeedPaginationController } from './PaginationController';
import { GlobalFeedQueryStreamController } from './QueryStreamController';
import { LiveCollectionController } from '~/core/liveCollection/LiveCollectionController';
import { isNonNullable } from '~/utils';
import { LinkedObject } from '~/utils/linkedObject';
import { preparePostPayload } from '~/postRepository/utils/payload';
import { getGlobalFeedSubscriptions } from '../utils';

export class GlobalFeedLiveCollectionController extends LiveCollectionController<
  'post',
  Amity.GlobalFeedLiveCollection,
  Amity.Post,
  GlobalFeedPaginationController
> {
  private queryStreamController: GlobalFeedQueryStreamController;

  private query: Amity.GlobalFeedLiveCollection;

  constructor(
    query: Amity.GlobalFeedLiveCollection,
    callback: Amity.LiveCollectionCallback<Amity.Post>,
  ) {
    const queryStreamId = hash(query);
    const cacheKey = ['globalFeed', 'collection', queryStreamId];
    const paginationController = new GlobalFeedPaginationController(query);

    super(paginationController, queryStreamId, cacheKey, callback);

    this.query = query;
    this.queryStreamController = new GlobalFeedQueryStreamController(
      this.query,
      this.cacheKey,
      this.notifyChange.bind(this),
      preparePostPayload,
    );

    this.callback = callback.bind(this);
    this.loadPage({ initial: true });
  }

  protected setup() {
    const collection = pullFromCache<Amity.GlobalFeedLiveCollectionCache>(this.cacheKey)?.data;

    if (!collection) {
      pushToCache(this.cacheKey, {
        data: [],
        params: {},
      });
    }
  }

  protected async persistModel(queryPayload: Amity.PostPayload & Amity.Pagination) {
    await this.queryStreamController.saveToMainDB(queryPayload);
  }

  protected persistQueryStream({
    response,
    direction,
    refresh,
  }: Amity.LiveCollectionPersistQueryStreamParams<'post'>) {
    this.queryStreamController.appendToQueryStream(response, direction, refresh);
  }

  startSubscription() {
    return this.queryStreamController.subscribeRTE(getGlobalFeedSubscriptions(this.cacheKey));
  }

  notifyChange({ origin, loading, error }: Amity.LiveCollectionNotifyParams) {
    const collection = pullFromCache<Amity.GlobalFeedLiveCollectionCache>(this.cacheKey)?.data;
    if (!collection) return;

    const data = (
      collection.data
        .map(id => pullFromCache<Amity.InternalPost>(['post', 'get', id])!)
        .filter(isNonNullable)
        .map(({ data }) => data) ?? []
    ).map(LinkedObject.post);

    if (!this.shouldNotify(data) && origin === 'event') return;

    this.callback({
      onNextPage: () => this.loadPage({ direction: Amity.LiveCollectionPageDirection.NEXT }),
      data,
      hasNextPage: !!this.paginationController.getNextToken(),
      loading,
      error,
    });
  }
}