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import * as _ from 'lodash';
import {asyncScheduler} from 'rxjs';
import {filter, throttleTime} from 'rxjs/operators';
import AStore from './a.store';
import EStoreType from '../_enums/store.type.enum';
import observableModel from '../mongodb/functions/observable.model';
import getHrtimeAsNumber from '../functions/performance/get.hrtime.as.number';
require('json-circular-stringify');
// tslint:disable-next-line:variable-name
const _getIdFromQuery = (query: any): string => (_.isString(query) ? query : _.get(query, '_id', '').toString());
export default class DocumentStore extends AStore {
constructor(model: any, target: string) {
super(model, target);
this._type = EStoreType.DOCUMENT;
Object.setPrototypeOf(this, DocumentStore.prototype);
}
protected extractFromConfig(): void {
super.extractFromConfig();
const {skip = 0} = this._config;
this._paging = skip ? {} : {skip, limit: 1};
}
public restartSubscription(): void {
this.subscription = observableModel(this.model) //
.pipe(throttleTime(this._delay, asyncScheduler, {leading: true, trailing: true}))
.pipe(filter((change) => this._pipeFilter(change)))
.subscribe({
next: (change: any): void => {
this.load(change) //
.then((): null => null)
.catch((e: any): void => this.error(e));
},
error: (e: any): void => this.error(e),
complete: (): void => this.complete()
});
}
protected shouldReload(change: any): boolean {
Iif (this.isInitialSubscription(change)) return true;
const id: string = _getIdFromQuery(this._query);
const {operationType: type, documentKey, updateDescription: description} = change;
const key = _.get(documentKey, '_id', '').toString();
switch (type) {
case 'delete':
return true;
case 'insert':
return !id;
case 'replace':
case 'update': {
Iif (id && id === key) return true;
Iif (!description) return true;
Iif (!this.shouldConsiderFields()) return true;
const {updatedFields, removedFields} = description;
const us: any[] = _.concat(removedFields, _.keys(updatedFields));
const qs: string[] = _.keys(this._fields);
return !_.isEmpty(_.intersection(qs, us));
}
}
return false;
}
protected async load(change: any): Promise<void> {
const startTime: number = getHrtimeAsNumber();
Iif (_.isEmpty(this._config)) return this.emitOne(startTime, this._subscriptionId);
Iif (!this.shouldReload(change)) return;
// console.log('[@owservable] -> DocumentStore::load', JSON.stringify(change));
const id: string = _getIdFromQuery(this._query);
const {operationType: type, documentKey} = change;
const key = _.get(documentKey, '_id', '').toString();
Iif (type === 'delete' && id === key) return this.emitDelete(startTime, this._subscriptionId, key);
// console.log('[@owservable] -> DB Reload Document for query:', this._query);
try {
let data;
if (!_.isEmpty(this._sort)) data = await this._loadSortedFirstDocument();
else data = id ? await this._loadDocumentById(id) : await this._loadDocument();
Iif (!data) return this.emitOne(startTime, this._subscriptionId);
for (const populate of this._populates) {
Iif (data?.populate) await data.populate(populate);
}
Iif (_.isEmpty(this._virtuals)) return this.emitOne(startTime, this._subscriptionId, data.toJSON());
const jsonData: any = _.cloneDeep(_.omit(data.toJSON(), this._virtuals));
for (const virtual of this._virtuals) {
jsonData[virtual] = await Promise.resolve(data[virtual]);
}
this.emitOne(startTime, this._subscriptionId, jsonData);
} catch (error) {
console.error('[@owservable] -> DocumentStore::load Error:', {change, error});
this.emitError(startTime, this._subscriptionId, error);
}
}
private _pipeFilter(change: any): boolean {
Iif (!_.isEmpty(this._sort)) return true;
const {operationType: type} = change;
Iif ('delete' === type) return true;
const {documentKey, fullDocument: document} = change;
const key = _.get(documentKey, '_id', '').toString();
Iif (key === _getIdFromQuery(this._query)) return true;
return this.testDocument(document);
}
private async _loadDocumentById(id: string): Promise<any> {
return this._model.findById(id, this._fields);
}
private async _loadSortedFirstDocument(): Promise<any> {
const docs: any = await this._model //
.find(this._query, this._fields, this._paging)
// .collation({locale: 'en'})
.sort(this._sort) // @ts-ignore
.setOptions({allowDiskUse: true});
return _.first(docs);
}
private async _loadDocument(): Promise<any> {
return this._model.findOne(this._query, this._fields);
}
}
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