TypeScript Socket.connect方法代码示例

    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);
      });
    });

/*
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);
  });
}

		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);
				}
			});
		});

    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<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));
      }
    });
  });

      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())
      })

function doFindFreePort(startPort: number, giveUpAfter: number, clb: (port: number) => void): void {
	if (giveUpAfter === 0) {
		return clb(0);
	}

	const client = new net.Socket();

	// If we can connect to the port it means the port is already taken so we continue searching
	client.once('connect', () => {
		dispose(client);

		return doFindFreePort(startPort + 1, giveUpAfter - 1, clb);
	});

	client.once('data', () => {
		// this listener is required since node.js 8.x
	});

	client.once('error', (err: Error & { code?: string }) => {
		dispose(client);

		// If we receive any non ECONNREFUSED error, it means the port is used but we cannot connect
		if (err.code !== 'ECONNREFUSED') {
			return doFindFreePort(startPort + 1, giveUpAfter - 1, clb);
		}

		// Otherwise it means the port is free to use!
		return clb(startPort);
	});

	client.connect(startPort, '127.0.0.1');
}

 socket.on('command', function (msg) {
     //io.emit('text change', msg);
     client.connect(PORT, HOST, function () {
         console.log('\nCONNECTED TO: ' + HOST + ':' + PORT + '\n- Command:' + msg);
         // 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(msg);
     });
 });

function memoryMap() {
  log.info('Reading memory...');

  //build up the socket
  let sock = new Socket();
  sock.setTimeout(10000);
  killOnProcessExit(sock);
  sock.on('error', err => {
    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');
  });

  //wait for first *HELLO* before starting the polling
  sock.once('data', function(data) {
    if (data) data = String(data);
    log.inbound(data);
    setTimeout(pollingLoop, 150);
  });
  //polling loop

  //store succesfully-read values here
  let values:(number|null)[] = new Array(0xFFFF);
  for (let i = 0; i < values.length; i++) {
    values[i] = 0;
  }
  let offset = 0x00;
  const startTime = Date.now();
  function pollingLoop() {
    readByte(sock, offset, (readable:boolean, value?:number) => {
      log.normal('byte', to4hex(offset), readable ? STATUS_OK : STATUS_ERR, value);
      //forecast ETA
      let elapsed = Date.now() - startTime;
      let total = elapsed * (0xffff / (offset + 1));
      let remain = total - elapsed;
      log.info('progress: elapsed', Math.round(elapsed/1000), 'sec; estimated remain', Math.round(remain / 1000), 'sec');
      //write to file... occasionally
      values[offset] = readable ? value : null;
      if (offset % 0x100 === 0) {
        log.info('SAVING RESULTS TO DISK');
        fs.writeFileSync('memscan.json', JSON.stringify(values));
      }
      //next
      offset += 1;
      if (offset <= 0xffff) {
        setTimeout(pollingLoop, 150);
      } else {
        log.info('SAVING RESULTS TO DISK');
        fs.writeFileSync('memscan.json', JSON.stringify(values));
        process.exit(0);
      }
    });
  }
}

conn.on('x11', (info: any, accept: any, reject: any) => {
    var xserversock = new net.Socket();
    xserversock.on('connect', () => {
        var xclientsock = accept();
        xclientsock.pipe(xserversock).pipe(xclientsock);
    });
    // connects to localhost:0.0
    xserversock.connect(6000, 'localhost');
});