1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 | 1x 1x 1x 1x 1x 1x 1x 1x 24x 24x 24x 24x 3x 3x 3x 1x 2x 2x 2x 2x 2x 2x 2x 5x 5x 5x 5x 5x 5x 5x 5x 5x 4x 4x 4x 4x 4x 2x 1x 2x 1x 2x 1x 1x 2x 1x 3x 3x 1x 2x 2x | 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); } } } |