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import * as _ from 'lodash';
import {Model} from 'mongoose';
import AStore from './a.store';
import EStoreType from '../_enums/store.type.enum';
import getHrtimeAsNumber from '../functions/performance/get.hrtime.as.number';
require('json-circular-stringify');
export default class CollectionStore extends AStore {
private _totalCount: number;
constructor(model: Model<any>, target: string) {
super(model, target);
this._totalCount = -1;
this._type = EStoreType.COLLECTION;
Object.setPrototypeOf(this, CollectionStore.prototype);
}
protected shouldReload(change: any): boolean {
Iif (this.isInitialSubscription(change)) return true;
const {operationType, updateDescription, fullDocument} = change;
Iif (!updateDescription) return true;
const {updatedFields, removedFields} = updateDescription;
const us: string[] = _.concat(removedFields, _.keys(updatedFields));
Iif (!_.isEmpty(_.intersection(_.keys(this._query), us))) return true;
switch (operationType) {
case 'delete':
case 'insert':
return true;
case 'replace':
case 'update':
Iif (this.shouldConsiderFields()) return !_.isEmpty(_.intersection(_.keys(this._fields), us));
return this.testDocument(fullDocument);
}
return false;
}
protected async sendCount(subscriptionId: string): Promise<void> {
const startTime: number = getHrtimeAsNumber();
this._totalCount = await this._model.countDocuments(this._query);
this.emitTotal(startTime, subscriptionId, this._totalCount);
}
protected delaySendCount: _.DebouncedFuncLeading<any> = _.throttle(this.sendCount, 5000);
protected async loadIncremental(startTime: number, currentLoadSubscriptionId: string, change: any): Promise<void> {
const {operationType, documentKey, fullDocument} = change;
const key = _.get(documentKey, '_id', '').toString();
Iif ('delete' === operationType) return this.emitDelete(startTime, currentLoadSubscriptionId, key);
for (const populate of this._populates) {
await this._model.populate(fullDocument, populate);
}
let document: any = fullDocument;
Iif (!_.isEmpty(this._virtuals)) {
document = _.cloneDeep(_.omit(fullDocument.toJSON(), this._virtuals));
for (const virtual of this._virtuals) {
document[virtual] = await Promise.resolve(fullDocument[virtual]);
}
}
return this.emitMany(startTime, currentLoadSubscriptionId, {data: document});
}
protected async loadAll(startTime: number, currentLoadSubscriptionId: string): Promise<void> {
let documents: any[] = await this._model //
.find(this._query, this._fields, this._paging)
.sort(this._sort) // @ts-ignore
.setOptions({allowDiskUse: true});
for (const populate of this._populates) {
await this._model.populate(documents, populate);
}
Iif (!_.isEmpty(this._virtuals)) {
const replacements: any[] = [];
for (const document of documents) {
const replacement: any = _.cloneDeep(_.omit(document.toJSON(), this._virtuals));
for (const virtual of this._virtuals) {
replacement[virtual] = await Promise.resolve(document[virtual]);
}
replacements.push(replacement);
}
documents = replacements;
}
if (this.isQueryChange(currentLoadSubscriptionId)) {
this.emitMany(startTime, currentLoadSubscriptionId, {total: this._totalCount, data: documents, recounting: true});
await this.sendCount(currentLoadSubscriptionId);
//
} else {
this.emitMany(startTime, currentLoadSubscriptionId, {total: this._totalCount, data: documents});
this.delaySendCount(currentLoadSubscriptionId);
}
this.removeSubscriptionDiff(currentLoadSubscriptionId);
}
protected async load(change: any): Promise<void> {
const startTime: number = getHrtimeAsNumber();
const currentLoadSubscriptionId: string = this._subscriptionId + '';
Iif (_.isEmpty(this._config)) return this.emitMany(startTime, currentLoadSubscriptionId);
Iif (!this.shouldReload(change)) return;
// console.log('[@owservable] -> CollectionStore::load', JSON.stringify(change));
try {
const {fullDocument} = change;
if (fullDocument && this._incremental) {
await this.loadIncremental(startTime, currentLoadSubscriptionId, change);
} else {
await this.loadAll(startTime, currentLoadSubscriptionId);
}
} catch (error) {
console.error('[@owservable] -> CollectionStore::load Error:', {change, error});
this.emitError(startTime, currentLoadSubscriptionId, error);
}
}
protected extractFromConfig(): void {
super.extractFromConfig();
const {incremental = false, page = 1, pageSize} = this._config;
this._incremental = incremental;
this._paging = {};
Iif (pageSize) {
this._paging = {
skip: (page - 1) * pageSize,
limit: pageSize
};
}
}
}
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