Kinvey/js-sdk

import { isString } from 'lodash-es';
import { Storage, Entity } from '../storage';
import { Query } from '../query';
import { getAppKey } from '../kinvey';

const QUERY_CACHE_TAG = '_QueryCache';
const SYNC_CACHE_TAG = 'kinvey_sync';

export function isValidTag(tag: string) {
  const regexp = /^[a-z0-9-]+$/i;
  return isString(tag) && regexp.test(tag);
}

export class DataStoreCache<T extends Entity> extends Storage<T> {
  constructor(collectionName: string, tag?: string) {
    if (tag && !isValidTag(tag)) {
      throw new Error('A tag can only contain letters, numbers, and "-".');
    }

    if (tag) {
      super(getAppKey(), `${collectionName}.${tag}`);
    } else {
      super(getAppKey(), collectionName);
    }
  }

  static clear() {
    return Storage.clear(getAppKey());
  }
}

export interface QueryEntity extends Entity {
  collectionName: string;
  query: string;
  lastRequest: string | null;
}

export class QueryCache extends DataStoreCache<QueryEntity> {
  constructor(tag?: string) {
    super(QUERY_CACHE_TAG, tag);
  }
}

export enum SyncEvent {
  Create = 'POST',
  Update = 'PUT',
  Delete = 'DELETE'
};

export interface SyncEntity extends Entity {
  entityId: string;
  collection: string;
  state: {
    operation: SyncEvent;
  }
}

export class SyncCache extends DataStoreCache<SyncEntity> {
  constructor(tag?: string) {
    super(SYNC_CACHE_TAG, tag);
  }
}