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import sift from 'sift';
import {randomUUID} from 'node:crypto';
import * as jsondiffpatch from 'jsondiffpatch';
import {cloneDeep, each, get, includes, isArray, isEmpty, isNil, omit, omitBy, set, values} from 'lodash';
import {Model} from 'mongoose';
import {throttleTime} from 'rxjs/operators';
import {asyncScheduler, Subject, Subscription} from 'rxjs';
import EStoreType from '../enums/store.type.enum';
import observableModel from '../mongodb/functions/observable.model.factory';
import getMillisecondsFrom from '../functions/performance/get.milliseconds.from';
import StoreSubscriptionConfigType from '../types/store.subscription.config.type';
import 'json-circular-stringify';
const DEFAULT_DELAY: number = 100;
const diffPatcher: jsondiffpatch.DiffPatcher = jsondiffpatch.create({
propertyFilter: (name: string): boolean => name !== 'subscriptionId'
});
// tslint:disable-next-line:variable-name
const _baseMessage = (target: string, incremental: boolean): any => ({
type: incremental ? 'increment' : 'update',
target,
payload: {}
});
export default abstract class AStore extends Subject<any> {
protected _model: Model<any>;
protected _target: string;
protected _type: EStoreType;
protected _config: StoreSubscriptionConfigType;
protected _incremental: boolean = false;
protected _subscriptionId: string;
protected _query: any;
protected _sort: any;
protected _fields: any;
protected _paging: any;
protected _populates: any[];
protected _virtuals: any[];
protected _delay: number;
protected _subscription: Subscription;
protected _subscriptionDiffs: Map<string, boolean>;
protected constructor(model: Model<any>, target: string) {
super();
this._model = model;
this._target = target;
this._query = {};
this._sort = {};
this._fields = {};
this._paging = {};
this._populates = [];
this._virtuals = [];
this._delay = DEFAULT_DELAY;
this._config = {
query: {___initial___: true},
strict: false,
incremental: false
};
this._subscriptionDiffs = new Map<string, boolean>();
}
public destroy(): void {
this._subscription?.unsubscribe();
delete this._subscription;
}
public restartSubscription(): void {
this.subscription = observableModel(this.model) //
.pipe(throttleTime(this._delay, asyncScheduler, {leading: true, trailing: true}))
.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 isInitialSubscription(change: any): boolean {
return isEmpty(change);
}
protected abstract shouldReload(change: any): boolean;
protected abstract load(change: any): Promise<void>;
protected extractFromConfig(): void {
const cfg: StoreSubscriptionConfigType = this._config;
let subscriptionIdResolved: string;
if (cfg.subscriptionId === undefined) subscriptionIdResolved = randomUUID();
else subscriptionIdResolved = cfg.subscriptionId;
const queryResolved: any = cfg.query === undefined ? {} : cfg.query;
const sortResolved: any = cfg.sort === undefined ? {} : cfg.sort;
const fieldsResolved: any = cfg.fields === undefined ? {} : cfg.fields;
const populatesResolved: any[] = cfg.populates === undefined ? [] : cfg.populates;
const virtualsResolved: any[] = cfg.virtuals === undefined ? [] : cfg.virtuals;
const delayResolved: number = cfg.delay ?? DEFAULT_DELAY;
this._subscriptionId = subscriptionIdResolved;
this._query = queryResolved;
this._sort = sortResolved;
this._populates = populatesResolved;
this._virtuals = virtualsResolved;
this._delay = delayResolved;
if (isArray(fieldsResolved)) {
this._fields = {};
each(fieldsResolved, (field: string) => set(this._fields, field, 1));
} else {
this._fields = fieldsResolved;
}
}
protected testDocument(document: any): boolean {
try {
const test = sift(omit(this._query, ['createdAt', 'updatedAt']));
return test(document);
} catch (error) {
console.error('[@owservable] -> AStore::testDocument Error:', {query: this._query, document, error});
return true;
}
}
protected set subscription(subscription: Subscription) {
this.destroy();
this._subscription = subscription;
this.load({}).then((): null => null);
}
protected get model(): Model<any> {
return this._model;
}
protected emitOne(startTime: number, subscriptionId: string, update: any = {}): void {
const message = _baseMessage(this._target, this._incremental);
set(message.payload, this._target, update);
this.next({
subscriptionId,
...message,
execution_time: getMillisecondsFrom(startTime).toFixed(2) + 'ms',
...this._responseStatistics()
});
}
protected emitMany(startTime: number, subscriptionId: string, update?: any): void {
let resolved: any;
if (update === undefined) {
resolved = {} as any;
resolved.total = 0;
resolved.data = [];
resolved.recounting = false;
} else {
resolved = update;
}
const {total, data, recounting} = resolved;
const message = _baseMessage(this._target, this._incremental);
set(message.payload, this._target, data);
if (!this._incremental && total >= 0) set(message.payload, '_' + this._target + 'Count', total);
if (recounting) set(message.payload, '_' + this._target + 'Recounting', true);
this.next({
subscriptionId,
...message,
execution_time: getMillisecondsFrom(startTime).toFixed(2) + 'ms',
...this._responseStatistics()
});
}
protected emitTotal(startTime: number, subscriptionId: string, total: any): void {
this.next({
subscriptionId,
type: 'total',
target: this._target,
total,
execution_time: getMillisecondsFrom(startTime).toFixed(2) + 'ms',
...this._responseStatistics()
});
}
protected emitDelete(startTime: number, subscriptionId: string, deleted: any): void {
this.next({
subscriptionId,
type: 'delete',
target: this._target,
payload: deleted,
execution_time: getMillisecondsFrom(startTime).toFixed(2) + 'ms',
...this._responseStatistics()
});
}
protected emitError(startTime: number, subscriptionId: string, error: any): void {
this.next({
subscriptionId,
type: 'error',
error,
target: this._target,
query: this._query,
sort: this._sort,
fields: this._fields,
paging: this._paging,
populates: this._populates,
virtuals: this._virtuals,
execution_time: getMillisecondsFrom(startTime).toFixed(2) + 'ms',
...this._responseStatistics()
});
}
protected shouldConsiderFields(): boolean {
return !isEmpty(this._fields) && !includes(values(this._fields), 0);
}
public set config(config: StoreSubscriptionConfigType) {
if (!this._isValidConfig(config)) return;
config.subscriptionId = config.subscriptionId || randomUUID();
if (this._type === EStoreType.COLLECTION) {
const queryDiff = jsondiffpatch.diff(get(this._config, 'query', {}), get(config, 'query', {}));
this._addSubscriptionDiff(config.subscriptionId, !isEmpty(queryDiff));
}
this._config = cloneDeep(config);
this.extractFromConfig();
this.restartSubscription();
}
public get target(): string {
return this._target;
}
protected removeSubscriptionDiff(subId: string) {
this._subscriptionDiffs.delete(subId);
}
protected isQueryChange(subId: string): boolean {
return !!this._subscriptionDiffs.get(subId);
}
private _isValidConfig(config: StoreSubscriptionConfigType): boolean {
if (!config) return false;
const diff = diffPatcher.diff(this._config, config);
return !isEmpty(diff);
}
private _addSubscriptionDiff(subId: string, diff: boolean) {
this._subscriptionDiffs.set(subId, diff);
}
private _responseStatistics(): any {
try {
return omitBy(
{
query: JSON.stringify(this._query),
sort: JSON.stringify(this._sort),
fields: JSON.stringify(this._fields),
paging: JSON.stringify(this._paging),
populates: JSON.stringify(this._populates),
virtuals: JSON.stringify(this._virtuals)
},
isNil
);
} catch (error) {
console.error('[@owservable] -> AStore::responseStatistics Error:', {error});
return {};
}
}
}
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