TypeScript Socket.on方法代碼示例

      server.listen(8788, 'localhost', () => {
        /**
         * Client
         */
        const client = new Socket()
        client.connect(8788, 'localhost', () => {
          log.silly('Doctor', 'testTcp() client connected')
          client.write('ding')
        })

        client.on('data', () => {
          /**
           * Promise Resolve
           */
          resolve(true)

          client.destroy() // kill client after server's response
        })
        /**
         * Promise Reject
         */
        client.on('error', reject)

        client.on('close', _ => server.close())
      })

	protected setupSocket(client: Socket): void  {
		var ffBuffer = new Buffer(0);
		client.on('data', (data) => {
			var newBuffer = Buffer.concat([ffBuffer, data], ffBuffer.length + data.length);
			var pos = 0;
			var parseResult;
			while (pos < newBuffer.length &&
						 (parseResult = this.parseFirefoxPacket(newBuffer, pos))) {
				this.onExecuteCommand(parseResult.body);
				pos = parseResult.lastPos;
			}
			if (pos < newBuffer.length) {
				ffBuffer = newBuffer.slice(pos);
			} else if (ffBuffer.length > 0) {
				ffBuffer = new Buffer(0);
			}
		});

		client.on('end', () => {
			client.end();
			console.log('client disconnected');
			this._state = 'disconnected';
			this.onDisconnect();
		});
		this._client = client;
	}

  return new Promise<any>((resolve, reject) => {
    const client = new net.Socket();
    let resolved = false;
    let buffer = "";

    client.connect(port, host, function() {
      client.write(JSON.stringify(msg));
    });

    client.on('error', function(err) {
      if (!resolved) {
        resolved = true;
        reject(err);
      }
    });

    client.on('data', function(data) {
      buffer += data.toString();
    });

    client.on('close', function() {
      if (!resolved) {
        resolved = true;
        resolve(JSON.parse(buffer));
      }
    });
  });

    public transmit(host: string, port: number, data: string, callback: TCPClientCallback) {
        let self = this;
        let client = new net.Socket();
        LoggingHelper.info(Logger, "Forwarding " + host + ":" + port);

        client.on("error", function (e: any) {
            console.log("TCPClient Error: " + e.message);
            if (e.code ===  "ECONNREFUSED") {
                callback(null, NetworkErrorType.CONNECTION_REFUSED, e.message);
            } else {
                callback(null, NetworkErrorType.OTHER, e.message);
            }
        });

        client.connect(port, host, function () {
            // Write a message to the socket as soon as the client is connected, the server will receive it as message from the client
            client.write(data);
        });


        // Add a 'data' event handler for the client socket
        // data is what the server sent to this socket
        client.on("data", function(data: Buffer) {
            callback(data, null, null);
        });

        // Add a 'close' event handler for the client socket
        client.on("close", function(had_error: boolean) {
            LoggingHelper.debug(Logger, "Connection closed ID: " + self.id + " HadError: " + had_error);
            if (self.onCloseCallback !== undefined && self.onCloseCallback !== null) {
                self.onCloseCallback();
            }
        });
    }

    return new Promise((resolve) => {
      this.socket.connect(this.port, this.address, () => {
        console.log('Connected');
        this.socket.write('Hello, server! Love, Client.');
        
        resolve();
      });

      this.socket.on('data', (data) => {
        console.log('Received: ' + data);
        //this.socket.destroy(); // kill client after server's response
        this.socket.end();
      });

      this.socket.on('timeout', () => {
        console.log('Connection closed');
      });

      this.socket.on('close', (hadError: boolean) => {
        console.log('Connection closed');
      });

      this.socket.on('end', () => {
        console.log('Connection closed');
      });

      this.socket.on("error", (error: Error) => {
        console.log(error);
      });
    });

		return new Promise<boolean>((resolve, reject) => {
			let isResolved = false;
			const socket = new net.Socket();

			socket.connect(this.port, '127.0.0.1', () => {
				socket.write(Buffer.from([0, 0, 0, 1, 1]));
			});
			socket.on("data", (data: any) => {
				isResolved = true;
				socket.destroy();
				resolve(true);
			});
			socket.on("error", () => {
				if (!isResolved) {
					isResolved = true;
					resolve(false);
				}
			});
			socket.on("close", () => {
				if (!isResolved) {
					isResolved = true;
					resolve(false);
				}
			});
		});

/*
If we connect to the machine, send one initial query and then stop, how long
can we idle until the machine terminates our connection?

Testing shows that this doesn't seem to be one consistent timeout, and that
instead it's however long it takes until the wifi flakes out a little bit.
*/
function guessIdleTimeout() {
  log.info('Estimating idle time...');
  let start = Date.now();

  let sock = new Socket();
  sock.setTimeout(10000);
  killOnProcessExit(sock);
  sock.on('data', function (data) {
    log.inbound(escapeUnprintables(data));
    if (String(data) === '*HELLO*') {
      setTimeout(function () {
        let msg = Checksum.attach('r00000001');
        log.outbound(msg);
        sock.write(msg);
      }, 100);
    }
  });
  sock.on('error', err => {
    let elapsed = Date.now() - start;
    log.info('elapsed', elapsed, 'ms');
    log.error(err);
    process.exit(1);
  });
  log.info('Connecting to %s:%s ...', DEST_HOST, DEST_PORT);
  sock.connect(DEST_PORT, DEST_HOST, function () {
    log.info('Connected');
    setInterval(() => {
      let elapsed = Date.now() - start;
      log.info('elapsed', elapsed, 'ms');
    }, 10000);
  });
}

      this.server = createServer((socket:Socket) => {

        socket.on("data", (data) => {
          console.log(data);
        });

        socket.on("close", () => {
          console.log("disconnected");
        });
      });

 start(connection: Socket): (req: ServerRequest, res: ServerResponse) => void {
     let messageProcessingService = this.container.resolve<MessageProcessingService>(MessageProcessingService);
     console.info(`client connected ${connection.remoteAddress}:${connection.remotePort}`);
     connection.on('end', () =>
         console.warn(`client ${connection.remoteAddress}:${connection.remotePort} disconnected`)
     );
     connection.on('data', function(data: string) {
         let request = JSON.parse(data);
         messageProcessingService.processRequest(request);
     });
     return function () {};
 }

function createClientSocket(endpointUrl: string): Socket {
    // create a socket based on Url
    const ep = parseEndpointUrl(endpointUrl);
    const port = parseInt( ep.port!, 10);
    const hostname = ep.hostname!;
    let socket: Socket;
    switch (ep.protocol) {
        case "opc.tcp:":

            socket = createConnection({ host: hostname, port });

            // Setting true for noDelay will immediately fire off data each time socket.write() is called.
            socket.setNoDelay(true);

            socket.setTimeout(0);

            socket.on("timeout", () => {
                debugLog("Socket has timed out");
            });

            return socket;
        case "fake:":
            socket = getFakeTransport();
            assert(ep.protocol === "fake:", " Unsupported transport protocol");
            process.nextTick(() => socket.emit("connect"));
            return socket;

        case "websocket:":
        case "http:":
        case "https:FF":
        default:
            throw new Error("this transport protocol is currently not supported :" + ep.protocol);

    }
}