# All files / websockets web-sockets-controller.ts

89.66% Statements 52/58
90% Branches 18/20
76.47% Functions 13/17
89.47% Lines 51/57

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     import { Type } from '@nestjs/common/interfaces/type.interface';
    import { isFunction } from '@nestjs/common/utils/shared.utils';
    import { ApplicationConfig } from '@nestjs/core/application-config';
    import { MetadataScanner } from '@nestjs/core/metadata-scanner';
    import { from as fromPromise, Observable, of, Subject } from 'rxjs';
    import { distinctUntilChanged, mergeAll } from 'rxjs/operators';
    import { GATEWAY_OPTIONS, PORT_METADATA } from './constants';
    import { WsContextCreator } from './context/ws-context-creator';
    import { InvalidSocketPortException } from './exceptions/invalid-socket-port.exception';
    import {
      GatewayMetadataExplorer,
      MessageMappingProperties,
    } from './gateway-metadata-explorer';
    import { NestGateway } from './interfaces/nest-gateway.interface';
    import { ObservableSocketServer } from './interfaces/observable-socket-server.interface';
    import { SocketServerProvider } from './socket-server-provider';

    export class WebSocketsController {
      private readonly metadataExplorer = new GatewayMetadataExplorer(
        new MetadataScanner(),
      );

      constructor(
        private readonly socketServerProvider: SocketServerProvider,
        private readonly config: ApplicationConfig,
        private readonly contextCreator: WsContextCreator,
      ) {}

      public hookGatewayIntoServer(
        instance: NestGateway,
        metatype: Type<any>,
        module: string,
      ) {
        const options = Reflect.getMetadata(GATEWAY_OPTIONS, metatype) || {};
        const port = Reflect.getMetadata(PORT_METADATA, metatype) || 0;

        if (!Number.isInteger(port)) {
          throw new InvalidSocketPortException(port, metatype);
        }
        this.subscribeObservableServer(instance, options, port, module);
      }

      public subscribeObservableServer(
        instance: NestGateway,
        options: any,
        port: number,
        module: string,
      ) {
        const nativeMessageHandlers = this.metadataExplorer.explore(instance);
        const messageHandlers = nativeMessageHandlers.map(
          ({ callback, message }) => ({
            message,
            callback: this.contextCreator.create(instance, callback, module),
          }),
        );
        const observableServer = this.socketServerProvider.scanForSocketServer(
          options,
          port,
        );
        this.hookServerToProperties(instance, observableServer.server);
        this.subscribeEvents(instance, messageHandlers, observableServer);
      }

      public subscribeEvents(
        instance: NestGateway,
        subscribersMap: MessageMappingProperties[],
        observableServer: ObservableSocketServer,
      ) {
        const { init, disconnect, connection, server } = observableServer;
        const adapter = this.config.getIoAdapter();

        this.subscribeInitEvent(instance, init);
        this.subscribeConnectionEvent(instance, connection);
        this.subscribeDisconnectEvent(instance, disconnect);

        const handler = this.getConnectionHandler(
          this,
          instance,
          subscribersMap,
          disconnect,
          connection,
        );
        adapter.bindClientConnect(server, handler);
      }

      public getConnectionHandler(
        context: WebSocketsController,
        instance: NestGateway,
        subscribersMap: MessageMappingProperties[],
        disconnect: Subject<any>,
        connection: Subject<any>,
      ) {
        const adapter = this.config.getIoAdapter();
        return (...args: any[]) => {
          const [client] = args;
          connection.next(args);
          context.subscribeMessages(subscribersMap, client, instance);

          const disconnectHook = adapter.bindClientDisconnect;
          disconnectHook &&
            disconnectHook.call(adapter, client, _ => disconnect.next(client));
        };
      }

      public subscribeInitEvent(instance: NestGateway, event: Subject<any>) {
        if (instance.afterInit) {
          event.subscribe(instance.afterInit.bind(instance));
        }
      }

      public subscribeConnectionEvent(instance: NestGateway, event: Subject<any>) {
        if (instance.handleConnection) {
          event
            .pipe(distinctUntilChanged())
            .subscribe((args: any[]) => instance.handleConnection(...args));
        }
      }

      public subscribeDisconnectEvent(instance: NestGateway, event: Subject<any>) {
        if (instance.handleDisconnect) {
          event
            .pipe(distinctUntilChanged())
            .subscribe(instance.handleDisconnect.bind(instance));
        }
      }

      public subscribeMessages<T = any>(
        subscribersMap: MessageMappingProperties[],
        client: T,
        instance: NestGateway,
      ) {
        const adapter = this.config.getIoAdapter();
        const handlers = subscribersMap.map(({ callback, message }) => ({
          message,
          callback: callback.bind(instance, client),
        }));
        adapter.bindMessageHandlers(client, handlers, data =>
          fromPromise(this.pickResult(data)).pipe(mergeAll()),
        );
      }

      public async pickResult(
        defferedResult: Promise<any>,
      ): Promise<Observable<any>> {
        const result = await defferedResult;
        if (result && isFunction(result.subscribe)) {
          return result;
        }
        Iif (result instanceof Promise) {
          return fromPromise(result);
        }
        return of(result);
      }

      private hookServerToProperties(instance: NestGateway, server) {
        for (const propertyKey of this.metadataExplorer.scanForServerHooks(
          instance,
        )) {
          Reflect.set(instance, propertyKey, server);
        }
      }
    }