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"use strict";
/*
* Copyright 2015 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
var __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
return extendStatics(d, b);
};
return function (d, b) {
if (typeof b !== "function" && b !== null)
throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
Object.defineProperty(exports, "__esModule", { value: true });
exports.WebSocketAdapter = exports.SocketIOAdapter = void 0;
exports.init = init;
exports.isSocketIoPath = isSocketIoPath;
var events_1 = require("events");
var socketio = require("socket.io");
var url = require("url");
// tslint:disable-next-line:enforce-name-casing
var webSocket = require("ws");
var logging = require("./logging");
var sessionCounter = 0;
/**
* The application settings instance.
*/
var appSettings;
/**
* Creates a WebSocket connected to the Jupyter server for the URL in the
* specified session.
*/
function createWebSocket(socketHost, port, session) {
var path = url.parse(session.url).path;
var socketUrl = "ws://".concat(socketHost, ":").concat(port).concat(path);
logging.getLogger().debug('Creating WebSocket to %s for session %d', socketUrl, session.id);
var ws = new webSocket(socketUrl);
ws.on('open', function () {
// Stash the resulting WebSocket, now that it is in open state
session.webSocket = ws;
session.socket.emit('open', { url: session.url });
})
.on('close', function () {
// Remove the WebSocket from the session, once it is in closed state
logging.getLogger().debug('WebSocket [%d] closed', session.id);
session.webSocket = null;
session.socket.emit('close', { url: session.url });
})
.on('message', function (data) {
// Propagate messages arriving on the WebSocket to the client.
if (data instanceof Buffer) {
logging.getLogger().debug('WebSocket [%d] binary message length %d', session.id, data.length);
}
else {
logging.getLogger().debug('WebSocket [%d] message\n%j', session.id, data);
}
session.socket.emit('data', { data: data });
})
// tslint:disable-next-line:no-any
.on('error', function (e) {
logging.getLogger().error('WebSocket [%d] error\n%j', session.id, e);
if (e.code === 'ECONNREFUSED') {
// This happens in the following situation -- old kernel that has gone
// away likely due to a restart/shutdown... and an old notebook client
// attempts to reconnect to the old kernel. That connection will be
// refused. In this case, there is no point in keeping this socket.io
// connection open.
session.socket.disconnect(/* close */ true);
}
});
return ws;
}
/**
* Closes the WebSocket instance associated with the session.
*/
function closeWebSocket(session) {
if (session.webSocket) {
session.webSocket.close();
session.webSocket = null;
}
}
/**
* Handles communication over the specified socket.
*/
function socketHandler(socket) {
sessionCounter++;
// Each socket is associated with a session that tracks the following:
// - id: a counter for use in log output
// - url: the url used to connect to the Jupyter server
// - socket: the socket.io socket reference, which generates message
// events for anything sent by the browser client, and allows
// emitting messages to send to the browser
// - webSocket: the corresponding WebSocket connection to the Jupyter
// server.
// Within a session, messages recieved over the socket.io socket (from the
// browser) are relayed to the WebSocket, and messages recieved over the
// WebSocket socket are relayed back to the socket.io socket (to the browser).
var session = { id: sessionCounter, url: '', socket: socket, webSocket: null };
logging.getLogger().debug('Socket connected for session %d', session.id);
socket.on('disconnect', function (reason) {
logging.getLogger().debug('Socket disconnected for session %d reason: %s', session.id, reason);
// Handle client disconnects to close WebSockets, so as to free up resources
closeWebSocket(session);
});
socket.on('start', function (message) {
logging.getLogger().debug('Start in session %d with url %s', session.id, message.url);
try {
var port = appSettings.nextJupyterPort;
if (appSettings.kernelManagerProxyPort) {
port = appSettings.kernelManagerProxyPort;
logging.getLogger().debug('Using kernel manager proxy port %d', port);
}
var host = 'localhost';
if (appSettings.kernelManagerProxyHost) {
host = appSettings.kernelManagerProxyHost;
}
session.url = message.url;
session.webSocket = createWebSocket(host, port, session);
// tslint:disable-next-line:no-any
}
catch (e) {
logging.getLogger().error(e, 'Unable to create WebSocket connection to %s', message.url);
session.socket.disconnect(/* close */ true);
}
});
socket.on('stop', function (message) {
logging.getLogger().debug('Stop in session %d with url %s', session.id, message.url);
closeWebSocket(session);
});
socket.on('data', function (message) {
// Propagate the message over to the WebSocket.
if (session.webSocket) {
if (message instanceof Buffer) {
logging.getLogger().debug('Send binary data of length %d in session %d.', message.length, session.id);
session.webSocket.send(message, function (e) {
if (e) {
logging.getLogger().error(e, 'Failed to send message to websocket');
}
});
}
else {
logging.getLogger().debug('Send data in session %d\n%s', session.id, message.data);
session.webSocket.send(message.data, function (e) {
if (e) {
logging.getLogger().error(e, 'Failed to send message to websocket');
}
});
}
}
else {
logging.getLogger().error('Unable to send message; WebSocket is not open');
}
});
}
/** Initialize the socketio handler. */
function init(server, settings) {
appSettings = settings;
var io = socketio(server, {
path: '/socket.io',
transports: ['polling'],
allowUpgrades: false,
// v2.10 changed default from 60s to 5s, prefer the longer timeout to
// avoid errant disconnects.
pingTimeout: 60000,
});
io.of('/session').on('connection', socketHandler);
return io;
}
/** Return true iff path is handled by socket.io. */
function isSocketIoPath(path) {
return path.indexOf('/socket.io/') === 0;
}
/** A base class for socket classes adapting to the Socket interface. */
var Adapter = /** @class */ (function () {
function Adapter() {
this.emitter = new events_1.EventEmitter();
}
Adapter.prototype.onClose = function (listener) {
this.emitter.on('close', listener);
};
Adapter.prototype.onStringMessage = function (listener) {
this.emitter.on('string_message', listener);
};
Adapter.prototype.onBinaryMessage = function (listener) {
this.emitter.on('binary_message', listener);
};
return Adapter;
}());
/** A socket adapter for socket.io. */
var SocketIOAdapter = /** @class */ (function (_super) {
__extends(SocketIOAdapter, _super);
function SocketIOAdapter(socket) {
var _this = _super.call(this) || this;
_this.socket = socket;
_this.socket.on('error', function (err) {
logging.getLogger().error("error on socket.io: ".concat(err));
// Event unsupported in Socket.
});
_this.socket.on('disconnecting', function () {
logging.getLogger().error("disconnecting socket.io");
// Event unsupported in Socket.
});
_this.socket.on('disconnect', function (reason) {
_this.emitter.emit('close', reason);
});
_this.socket.on('data', function (event) {
if (event instanceof Buffer) {
_this.emitter.emit('binary_message', event);
}
else if (typeof event.data === 'string') {
_this.emitter.emit('string_message', event.data);
}
else {
_this.emitter.emit('binary_message', event.data);
}
});
return _this;
}
SocketIOAdapter.prototype.sendString = function (data) {
this.socket.emit('data', { data: data });
};
SocketIOAdapter.prototype.sendBinary = function (data) {
this.socket.emit('data', { data: data });
};
SocketIOAdapter.prototype.close = function (keepTransportOpen) {
this.socket.disconnect(!keepTransportOpen);
};
return SocketIOAdapter;
}(Adapter));
exports.SocketIOAdapter = SocketIOAdapter;
/** A socket adapter for websockets. */
var WebSocketAdapter = /** @class */ (function (_super) {
__extends(WebSocketAdapter, _super);
function WebSocketAdapter(ws) {
var _this = _super.call(this) || this;
_this.ws = ws;
_this.ws.on('error', function (err) {
logging.getLogger().error("websocket error: ".concat(err));
});
_this.ws.on('disconnecting', function () {
logging.getLogger().error("disconnecting websocket");
// Event unsupported in Socket.
});
_this.ws.on('close', function (code, reason) {
_this.emitter.emit('close', "code:".concat(code, " reason:").concat(reason));
});
_this.ws.on('message', function (data) {
if (typeof data === 'string') {
_this.emitter.emit('string_message', data);
}
else {
_this.emitter.emit('binary_message', data);
}
});
return _this;
}
WebSocketAdapter.prototype.sendString = function (data) {
if (this.ws.readyState === webSocket.OPEN) {
this.ws.send(data);
}
};
WebSocketAdapter.prototype.sendBinary = function (data) {
if (this.ws.readyState === webSocket.OPEN) {
this.ws.send(data);
}
};
// tslint:disable-next-line:no-unused-variable
WebSocketAdapter.prototype.close = function (keepTransportOpen) {
this.ws.close();
};
return WebSocketAdapter;
}(Adapter));
exports.WebSocketAdapter = WebSocketAdapter;
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* Copyright 2015 Google Inc. All rights reserved.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\"); you may not\n * use this file except in compliance with the License. You may obtain a copy of\n * the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS, WITHOUT\n * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the\n * License for the specific language governing permissions and limitations under\n * the License.\n */\n\nimport {EventEmitter} from 'events';\nimport * as http from 'http';\nimport * as socketio from 'socket.io';\nimport * as url from 'url';\n// tslint:disable-next-line:enforce-name-casing\nimport * as webSocket from 'ws';\n\nimport {AppSettings} from './appSettings';\nimport * as logging from './logging';\n\ninterface Session {\n  id: number;\n  url: string;\n  socket: SocketIO.Socket;\n  webSocket: webSocket|null;\n}\n\ninterface SessionMessage {\n  url: string;\n}\n\ninterface DataMessage {\n  data: string;\n}\n\nlet sessionCounter = 0;\n\n/**\n * The application settings instance.\n */\nlet appSettings: AppSettings;\n\n/**\n * Creates a WebSocket connected to the Jupyter server for the URL in the\n * specified session.\n */\nfunction createWebSocket(\n    socketHost: string, port: number, session: Session): webSocket {\n  const path = url.parse(session.url).path;\n  const socketUrl = `ws://${socketHost}:${port}${path}`;\n  logging.getLogger().debug(\n      'Creating WebSocket to %s for session %d', socketUrl, session.id);\n\n  const ws = new webSocket(socketUrl);\n  ws.on('open',\n        () => {\n          // Stash the resulting WebSocket, now that it is in open state\n          session.webSocket = ws;\n          session.socket.emit('open', {url: session.url});\n        })\n      .on('close',\n          () => {\n            // Remove the WebSocket from the session, once it is in closed state\n            logging.getLogger().debug('WebSocket [%d] closed', session.id);\n            session.webSocket = null;\n            session.socket.emit('close', {url: session.url});\n          })\n      .on('message',\n          (data) => {\n            // Propagate messages arriving on the WebSocket to the client.\n            if (data instanceof Buffer) {\n              logging.getLogger().debug(\n                  'WebSocket [%d] binary message length %d', session.id,\n                  data.length);\n            } else {\n              logging.getLogger().debug(\n                  'WebSocket [%d] message\\n%j', session.id, data);\n            }\n            session.socket.emit('data', {data});\n          })\n      // tslint:disable-next-line:no-any\n      .on('error', (e: any) => {\n        logging.getLogger().error('WebSocket [%d] error\\n%j', session.id, e);\n        if (e.code === 'ECONNREFUSED') {\n          // This happens in the following situation -- old kernel that has gone\n          // away likely due to a restart/shutdown... and an old notebook client\n          // attempts to reconnect to the old kernel. That connection will be\n          // refused. In this case, there is no point in keeping this socket.io\n          // connection open.\n          session.socket.disconnect(/* close */ true);\n        }\n      });\n\n  return ws;\n}\n\n/**\n * Closes the WebSocket instance associated with the session.\n */\nfunction closeWebSocket(session: Session): void {\n  if (session.webSocket) {\n    session.webSocket.close();\n    session.webSocket = null;\n  }\n}\n\n/**\n * Handles communication over the specified socket.\n */\nfunction socketHandler(socket: SocketIO.Socket) {\n  sessionCounter++;\n\n  // Each socket is associated with a session that tracks the following:\n  // - id: a counter for use in log output\n  // - url: the url used to connect to the Jupyter server\n  // - socket: the socket.io socket reference, which generates message\n  //           events for anything sent by the browser client, and allows\n  //           emitting messages to send to the browser\n  // - webSocket: the corresponding WebSocket connection to the Jupyter\n  //              server.\n  // Within a session, messages recieved over the socket.io socket (from the\n  // browser) are relayed to the WebSocket, and messages recieved over the\n  // WebSocket socket are relayed back to the socket.io socket (to the browser).\n  const session:\n      Session = {id: sessionCounter, url: '', socket, webSocket: null};\n\n  logging.getLogger().debug('Socket connected for session %d', session.id);\n\n  socket.on('disconnect', (reason) => {\n    logging.getLogger().debug(\n        'Socket disconnected for session %d reason: %s', session.id, reason);\n\n    // Handle client disconnects to close WebSockets, so as to free up resources\n    closeWebSocket(session);\n  });\n\n  socket.on('start', (message: SessionMessage) => {\n    logging.getLogger().debug(\n        'Start in session %d with url %s', session.id, message.url);\n\n    try {\n      let port = appSettings.nextJupyterPort;\n      if (appSettings.kernelManagerProxyPort) {\n        port = appSettings.kernelManagerProxyPort;\n        logging.getLogger().debug('Using kernel manager proxy port %d', port);\n      }\n      let host = 'localhost';\n      if (appSettings.kernelManagerProxyHost) {\n        host = appSettings.kernelManagerProxyHost;\n      }\n      session.url = message.url;\n      session.webSocket = createWebSocket(host, port, session);\n      // tslint:disable-next-line:no-any\n    } catch (e: any) {\n      logging.getLogger().error(\n          e, 'Unable to create WebSocket connection to %s', message.url);\n      session.socket.disconnect(/* close */ true);\n    }\n  });\n\n  socket.on('stop', (message: SessionMessage) => {\n    logging.getLogger().debug(\n        'Stop in session %d with url %s', session.id, message.url);\n\n    closeWebSocket(session);\n  });\n\n  socket.on('data', (message: DataMessage) => {\n    // Propagate the message over to the WebSocket.\n    if (session.webSocket) {\n      if (message instanceof Buffer) {\n        logging.getLogger().debug(\n            'Send binary data of length %d in session %d.', message.length,\n            session.id);\n        session.webSocket.send(message, (e) => {\n          if (e) {\n            logging.getLogger().error(e, 'Failed to send message to websocket');\n          }\n        });\n      } else {\n        logging.getLogger().debug(\n            'Send data in session %d\\n%s', session.id, message.data);\n        session.webSocket.send(message.data, (e) => {\n          if (e) {\n            logging.getLogger().error(e, 'Failed to send message to websocket');\n          }\n        });\n      }\n    } else {\n      logging.getLogger().error(\n          'Unable to send message; WebSocket is not open');\n    }\n  });\n}\n\n/** Initialize the socketio handler. */\nexport function init(\n    server: http.Server, settings: AppSettings): SocketIO.Server {\n  appSettings = settings;\n  const io = socketio(server, {\n    path: '/socket.io',\n    transports: ['polling'],\n    allowUpgrades: false,\n    // v2.10 changed default from 60s to 5s, prefer the longer timeout to\n    // avoid errant disconnects.\n    pingTimeout: 60000,\n  });\n\n  io.of('/session').on('connection', socketHandler);\n  return io;\n}\n\n/** Return true iff path is handled by socket.io. */\nexport function isSocketIoPath(path: string): boolean {\n  return path.indexOf('/socket.io/') === 0;\n}\n\n\n/**\n * A simple socket abstraction to support transitioning from socket.io to\n * websocket.\n */\nexport interface Socket {\n  /** Send string data. Silently drops messages if not connected. */\n  sendString(data: string): void;\n\n  /** Send binary data. Silently drops messages if not connected. */\n  sendBinary(data: ArrayBuffer): void;\n\n  /**\n   * Close the socket.\n   *\n   * @param keepTransportOpen: When true and the underlying transport supports\n   * multiplexing socket connections, keep that transport open.\n   *\n   */\n  close(keepTransportOpen: boolean): void;\n\n  /** Listen for socket close events. */\n  onClose(listener: (reason: string) => void): void;\n\n  /** Listen for string type data received events. */\n  onStringMessage(listener: (data: string) => void): void;\n\n  /** Listen for binary type data received events. */\n  onBinaryMessage(listener: (data: Buffer) => void): void;\n}\n\n\n/** A base class for socket classes adapting to the Socket interface. */\nabstract class Adapter implements Socket {\n  protected readonly emitter = new EventEmitter();\n\n  abstract sendString(data: string): void;\n\n  abstract sendBinary(data: ArrayBuffer): void;\n\n  abstract close(keepTransportOpen: boolean): void;\n\n  onClose(listener: (reason: string) => void) {\n    this.emitter.on('close', listener);\n  }\n\n  onStringMessage(listener: (data: string) => void) {\n    this.emitter.on('string_message', listener);\n  }\n\n  onBinaryMessage(listener: (data: Buffer) => void) {\n    this.emitter.on('binary_message', listener);\n  }\n}\n\n\n/** A socket adapter for socket.io.  */\nexport class SocketIOAdapter extends Adapter {\n  constructor(private readonly socket: SocketIO.Socket) {\n    super();\n    this.socket.on('error', (err) => {\n      logging.getLogger().error(`error on socket.io: ${err}`);\n      // Event unsupported in Socket.\n    });\n\n    this.socket.on('disconnecting', () => {\n      logging.getLogger().error(`disconnecting socket.io`);\n      // Event unsupported in Socket.\n    });\n\n    this.socket.on('disconnect', (reason) => {\n      this.emitter.emit('close', reason);\n    });\n\n    this.socket.on('data', (event: DataMessage|Buffer) => {\n      if (event instanceof Buffer) {\n        this.emitter.emit('binary_message', event);\n      } else if (typeof event.data === 'string') {\n        this.emitter.emit('string_message', event.data);\n      } else {\n        this.emitter.emit('binary_message', event.data);\n      }\n    });\n  }\n\n  sendString(data: string) {\n    this.socket.emit('data', {data});\n  }\n\n  sendBinary(data: ArrayBuffer) {\n    this.socket.emit('data', {data});\n  }\n\n  close(keepTransportOpen: boolean) {\n    this.socket.disconnect(!keepTransportOpen);\n  }\n}\n\n/** A socket adapter for websockets.  */\nexport class WebSocketAdapter extends Adapter {\n  constructor(private readonly ws: webSocket) {\n    super();\n    this.ws.on('error', (err) => {\n      logging.getLogger().error(`websocket error: ${err}`);\n    });\n\n    this.ws.on('disconnecting', () => {\n      logging.getLogger().error(`disconnecting websocket`);\n      // Event unsupported in Socket.\n    });\n\n    this.ws.on('close', (code, reason) => {\n      this.emitter.emit('close', `code:${code} reason:${reason}`);\n    });\n\n    this.ws.on('message', (data) => {\n      if (typeof data === 'string') {\n        this.emitter.emit('string_message', data);\n      } else {\n        this.emitter.emit('binary_message', data);\n      }\n    });\n  }\n\n  sendString(data: string) {\n    if (this.ws.readyState === webSocket.OPEN) {\n      this.ws.send(data);\n    }\n  }\n\n  sendBinary(data: ArrayBuffer) {\n    if (this.ws.readyState === webSocket.OPEN) {\n      this.ws.send(data);\n    }\n  }\n\n  // tslint:disable-next-line:no-unused-variable\n  close(keepTransportOpen: boolean) {\n    this.ws.close();\n  }\n}\n"]} |