import { ArgumentsHost } from '@nestjs/common';
import { ExceptionFilterMetadata } from '@nestjs/common/interfaces/exceptions/exception-filter-metadata.interface';
import { isEmpty } from '@nestjs/common/utils/shared.utils';
import { InvalidExceptionFilterException } from '@nestjs/core/errors/exceptions/invalid-exception-filter.exception';
import { WsException } from '../exceptions/ws-exception';
import { BaseWsExceptionFilter } from './base-ws-exception-filter';
export class WsExceptionsHandler extends BaseWsExceptionFilter {
private filters: ExceptionFilterMetadata[] = [];
public handle(exception: Error | WsException | any, host: ArgumentsHost) {
const client = host.switchToWs().getClient();
if (this.invokeCustomFilters(exception, host) || !client.emit) {
return;
}
super.catch(exception, host);
}
public setCustomFilters(filters: ExceptionFilterMetadata[]) {
Iif (!Array.isArray(filters)) {
throw new InvalidExceptionFilterException();
}
this.filters = filters;
}
public invokeCustomFilters(exception, args: ArgumentsHost): boolean {
if (isEmpty(this.filters)) return false;
const filter = this.filters.find(({ exceptionMetatypes }) => {
const hasMetatype =
!exceptionMetatypes.length ||
exceptionMetatypes.some(
ExceptionMetatype => exception instanceof ExceptionMetatype,
);
return hasMetatype;
});
filter && filter.func(exception, args);
return !!filter;
}
}
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