TypeScript Server.on方法代碼示例

    return protractorUtils.findFreeTcpPort().then(port => {
      const app = new http.Server();

      app.on('request', (req, res) => {
        res.writeHead(200, {'Content-Type': 'text/plain'});
        res.write('Hello World');
        res.end('\n');
      });

      browser.baseUrl = `http://localhost:${port}`;

      return new Promise(resolve => { app.listen(port, () => { resolve(); }); });
    });

		return new Promise((resolve) => {
			const server = this.server = createServer((request: IncomingMessage, response: ServerResponse) => {
				return this._handler(request, response);
			});
			this._sessions = {};
			this._codeCache = {};

			const sockets: Socket[] = [];

			// If sockets are not manually destroyed then Node.js will keep itself running until they all expire
			after(server, 'close', function () {
				let socket: Socket;
				while ((socket = sockets.pop())) {
					socket.destroy();
				}
			});

			server.on('connection', socket => {
				this.executor.log('HTTP connection opened');
				sockets.push(socket);

				// Disabling Nagle improves server performance on low-latency connections, which are more common
				// during testing than high-latency connections
				socket.setNoDelay(true);

				socket.on('close', function () {
					let index = sockets.indexOf(socket);
					index !== -1 && sockets.splice(index, 1);
				});
			});

			this._wsServer = new WebSocket.Server({ port: this.port + 1 });
			this._wsServer.on('connection', client => {
				this.executor.log('WebSocket connection opened:', client);
				this._handleWebSocket(client);
			});
			this._wsServer.on('error', error => {
				this.executor.emit('error', error);
			});

			server.listen(this.port, resolve);
		});

export async function enhanceHttpServerWithSubscriptions(
  websocketServer: Server,
  postgraphileMiddleware: HttpRequestHandler,
  subscriptionServerOptions?: {
    keepAlive?: number;
  },
) {
  if (websocketServer['__postgraphileSubscriptionsEnabled']) {
    return;
  }
  websocketServer['__postgraphileSubscriptionsEnabled'] = true;
  const {
    options,
    getGraphQLSchema,
    withPostGraphileContextFromReqRes,
    handleErrors,
  } = postgraphileMiddleware;
  const pluginHook = pluginHookFromOptions(options);
  const graphqlRoute = options.graphqlRoute || '/graphql';

  const schema = await getGraphQLSchema();

  const keepalivePromisesByContextKey: { [contextKey: string]: Deferred<void> | null } = {};

  const contextKey = (ws: WebSocket, opId: string) => ws['postgraphileId'] + '|' + opId;

  const releaseContextForSocketAndOpId = (ws: WebSocket, opId: string) => {
    const promise = keepalivePromisesByContextKey[contextKey(ws, opId)];
    if (promise) {
      promise.resolve();
      keepalivePromisesByContextKey[contextKey(ws, opId)] = null;
    }
  };

  const addContextForSocketAndOpId = (context: mixed, ws: WebSocket, opId: string) => {
    releaseContextForSocketAndOpId(ws, opId);
    const promise = deferred();
    promise['context'] = context;
    keepalivePromisesByContextKey[contextKey(ws, opId)] = promise;
    return promise;
  };

  const applyMiddleware = async (
    middlewares: Array<Middleware> = [],
    req: IncomingMessage,
    res: ServerResponse,
  ) => {
    for (const middleware of middlewares) {
      // TODO: add Koa support
      await new Promise((resolve, reject) => {
        middleware(req, res, err => (err ? reject(err) : resolve()));
      });
    }
  };

  const reqResFromSocket = async (socket: WebSocket) => {
    const req = socket['__postgraphileReq'];
    if (!req) {
      throw new Error('req could not be extracted');
    }
    let dummyRes = socket['__postgraphileRes'];
    if (req.res) {
      throw new Error(
        "Please get in touch with Benjie; we weren't expecting req.res to be present but we want to reserve it for future usage.",
      );
    }
    if (!dummyRes) {
      dummyRes = new ServerResponse(req);
      dummyRes.writeHead = (statusCode: number, _statusMessage: never, headers: never) => {
        if (statusCode && statusCode > 200) {
          // tslint:disable-next-line no-console
          console.error(
            `Something used 'writeHead' to write a '${statusCode}' error for websockets - check the middleware you're passing!`,
          );
          socket.close();
        } else if (headers) {
          // tslint:disable-next-line no-console
          console.error(
            "Passing headers to 'writeHead' is not supported with websockets currently - check the middleware you're passing",
          );
          socket.close();
        }
      };
      await applyMiddleware(options.websocketMiddlewares, req, dummyRes);
      socket['__postgraphileRes'] = dummyRes;
    }
    return { req, res: dummyRes };
  };

  const getContext = (socket: WebSocket, opId: string) => {
    return new Promise((resolve, reject) => {
      reqResFromSocket(socket)
        .then(({ req, res }) =>
          withPostGraphileContextFromReqRes(req, res, { singleStatement: true }, context => {
            const promise = addContextForSocketAndOpId(context, socket, opId);
            resolve(promise['context']);
            return promise;
          }),
        )
        .then(null, reject);
//.........這裏部分代碼省略.........

 handle(cb: Function) {
     this.httpServer.on('request', (request, response) => {
         this.createContext(request, response, cb);
     });
 }

    return new Promise<void>((resolve, reject) => {
      const app = (this._app = express());
      this._sessions = {};

      this.executor.log(
        'Listening for WebSocket connections on port',
        this.socketPort
      );

      wsServer = new WebSocket.Server({ port: this.socketPort });
      wsServer.on('connection', client => {
        this.executor.log('WebSocket connection opened:', client);
        this._handleWebSocket(client);
      });
      wsServer.on('error', error => {
        if (isErrnoException(error) && error.code === 'EADDRINUSE') {
          const err: NodeJS.ErrnoException = new Error(
            `Something is already listening on the websocket server port (${
              this.socketPort
            })`
          );
          err.code = error.code;
          err.errno = error.errno;
          reject(err);
        } else if (!this._wsServer) {
          reject(error);
        } else {
          this.executor.emit('error', error);
        }
      });

      const context = Object.create(null, {
        stopped: {
          enumerable: true,
          get: () => this.stopped
        },
        basePath: {
          enumerable: true,
          get: () => this.basePath
        },
        executor: {
          enumerable: true,
          get: () => this.executor
        },
        handleMessage: {
          enumerable: false,
          writable: false,
          configurable: false,
          value: (message: Message) => this._handleMessage(message)
        }
      });

      // Add "intern" object to both request and response objects
      Object.defineProperty(app.request, 'intern', {
        enumerable: true,
        get: () => context
      });
      Object.defineProperty(app.response, 'intern', {
        enumerable: true,
        get: () => context
      });

      app.use(filterUrl());

      // Handle JSON and form-encoded request bodies
      app.use(json({ limit: '1mb' }), urlencoded({ extended: true }));

      // Log all requests
      app.use((request, _response, next) => {
        this.executor.log(`${request.method} request for ${request.url}`);
        return next();
      });

      const internPath = this.executor.config.internPath;

      // Allow resolution using both __intern and node_modules/intern.
      // Note that internPath will always end with a '/'.
      app.use(
        [`/${internPath}__resolveSuites__`, '/__intern/__resolveSuites__'],
        resolveSuites(context)
      );

      // Map __intern to config.internPath
      app.use('/__intern', express.static(internPath, { fallthrough: false }));

      // TODO: Allow user to add middleware here

      app.use(
        instrument(context),
        express.static(this.basePath),
        post(context),
        unhandled(),
        finalError()
      );

      httpServer = app.listen(this.port, resolve);
      httpServer.on('error', error => {
        if (isErrnoException(error) && error.code === 'EADDRINUSE') {
          const err: NodeJS.ErrnoException = new Error(
            `Something is already listening on the server port (${this.port})`
//.........這裏部分代碼省略.........

import * as http from 'http';
import config from './config/config';
import { Socket } from './socket/index';

const app = require('./config/express').default();

const server: http.Server = new http.Server(app);

new Socket(server);

server.listen(config.port);

server.on('error', (e: Error) => {
  console.log('Error starting server' + e);
});

server.on('listening', () => {
  if (config.useMongo) {
    console.log(`Server started on port ${config.port} on env ${process.env.NODE_ENV || 'dev'} dbcon ${config.mongodb}`);
  } else {
    console.log(`Server started on port ${config.port} on env ${process.env.NODE_ENV || 'dev'}`);
  }
});

app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));

app.use('/', routes);

// catch 404 and forward to error handler
app.use(function(req: Request, res: Response, next: NextFunction) {
  var err: any = new Error('Not Found');
  err.status = 404;
  next(err);
});

if (app.get('env') === 'development') {
  app.use(function(err: any, req: Request, res: Response, next: NextFunction) {
    res.status(err.status || 500);
    res.json({
      message: err.message,
      error: err
    });
  });
}

var server: Server = http.createServer(app);
server.listen(process.env.PORT || '4000');
server.on('listening', function() {
  var addr: any = server.address();
  var bind: string = typeof addr === 'string' ? 'pipe ' + addr : 'port ' + addr.port;
  console.log('Listening on ' + bind);
});