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//----------------------------------------------------------------------------
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// Copyright (C) 2008-2011 The IPython Development Team
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//
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// Distributed under the terms of the BSD License. The full license is in
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// the file COPYING, distributed as part of this software.
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//----------------------------------------------------------------------------
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//============================================================================
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// Kernel
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//============================================================================
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/**
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* @module IPython
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* @namespace IPython
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* @submodule Kernel
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*/
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var IPython = (function (IPython) {
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"use strict";
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var utils = IPython.utils;
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// Initialization and connection.
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/**
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* A Kernel Class to communicate with the Python kernel
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* @Class Kernel
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*/
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var Kernel = function (kernel_service_url) {
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this.kernel_id = null;
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this.shell_channel = null;
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this.iopub_channel = null;
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this.stdin_channel = null;
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this.kernel_service_url = kernel_service_url;
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this.running = false;
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this.username = "username";
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this.session_id = utils.uuid();
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this._msg_callbacks = {};
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if (typeof(WebSocket) !== 'undefined') {
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this.WebSocket = WebSocket;
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} else if (typeof(MozWebSocket) !== 'undefined') {
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this.WebSocket = MozWebSocket;
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} else {
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alert('Your browser does not have WebSocket support, please try Chrome, Safari or Firefox ≥ 6. Firefox 4 and 5 are also supported by you have to enable WebSockets in about:config.');
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}
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this.bind_events();
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this.init_iopub_handlers();
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this.comm_manager = new IPython.CommManager(this);
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this.widget_manager = new IPython.WidgetManager(this.comm_manager);
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};
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Kernel.prototype._get_msg = function (msg_type, content, metadata) {
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var msg = {
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header : {
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msg_id : utils.uuid(),
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username : this.username,
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session : this.session_id,
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msg_type : msg_type
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},
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metadata : metadata || {},
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content : content,
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parent_header : {}
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};
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return msg;
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};
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Kernel.prototype.bind_events = function () {
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var that = this;
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$([IPython.events]).on('send_input_reply.Kernel', function(evt, data) {
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that.send_input_reply(data);
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});
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};
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// Initialize the iopub handlers
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Kernel.prototype.init_iopub_handlers = function () {
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var output_types = ['stream', 'display_data', 'pyout', 'pyerr'];
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this._iopub_handlers = {};
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this.register_iopub_handler('status', $.proxy(this._handle_status_message, this));
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this.register_iopub_handler('clear_output', $.proxy(this._handle_clear_output, this));
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for (var i=0; i < output_types.length; i++) {
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this.register_iopub_handler(output_types[i], $.proxy(this._handle_output_message, this));
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}
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};
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/**
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* Start the Python kernel
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* @method start
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*/
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Kernel.prototype.start = function (params) {
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params = params || {};
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if (!this.running) {
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var qs = $.param(params);
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$.post(utils.url_join_encode(this.kernel_service_url) + '?' + qs,
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$.proxy(this._kernel_started, this),
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'json'
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);
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}
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};
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/**
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* Restart the python kernel.
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*
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* Emit a 'status_restarting.Kernel' event with
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* the current object as parameter
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*
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* @method restart
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*/
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Kernel.prototype.restart = function () {
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$([IPython.events]).trigger('status_restarting.Kernel', {kernel: this});
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if (this.running) {
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this.stop_channels();
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$.post(utils.url_join_encode(this.kernel_url, "restart"),
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$.proxy(this._kernel_started, this),
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'json'
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);
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}
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};
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Kernel.prototype._kernel_started = function (json) {
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console.log("Kernel started: ", json.id);
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this.running = true;
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this.kernel_id = json.id;
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// trailing 's' in https will become wss for secure web sockets
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this.ws_host = location.protocol.replace('http', 'ws') + "//" + location.host;
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this.kernel_url = utils.url_path_join(this.kernel_service_url, this.kernel_id);
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this.start_channels();
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};
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Kernel.prototype._websocket_closed = function(ws_url, early) {
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this.stop_channels();
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$([IPython.events]).trigger('websocket_closed.Kernel',
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{ws_url: ws_url, kernel: this, early: early}
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);
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};
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/**
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* Start the `shell`and `iopub` channels.
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* Will stop and restart them if they already exist.
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*
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* @method start_channels
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*/
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Kernel.prototype.start_channels = function () {
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var that = this;
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this.stop_channels();
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var ws_host_url = this.ws_host + this.kernel_url;
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console.log("Starting WebSockets:", ws_host_url);
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this.shell_channel = new this.WebSocket(
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this.ws_host + utils.url_join_encode(this.kernel_url, "shell")
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);
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this.stdin_channel = new this.WebSocket(
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this.ws_host + utils.url_join_encode(this.kernel_url, "stdin")
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);
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this.iopub_channel = new this.WebSocket(
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this.ws_host + utils.url_join_encode(this.kernel_url, "iopub")
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);
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var already_called_onclose = false; // only alert once
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var ws_closed_early = function(evt){
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if (already_called_onclose){
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return;
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}
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already_called_onclose = true;
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if ( ! evt.wasClean ){
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that._websocket_closed(ws_host_url, true);
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}
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};
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var ws_closed_late = function(evt){
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if (already_called_onclose){
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return;
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}
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already_called_onclose = true;
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if ( ! evt.wasClean ){
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that._websocket_closed(ws_host_url, false);
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}
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};
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var channels = [this.shell_channel, this.iopub_channel, this.stdin_channel];
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for (var i=0; i < channels.length; i++) {
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channels[i].onopen = $.proxy(this._ws_opened, this);
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channels[i].onclose = ws_closed_early;
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}
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// switch from early-close to late-close message after 1s
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setTimeout(function() {
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for (var i=0; i < channels.length; i++) {
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if (channels[i] !== null) {
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channels[i].onclose = ws_closed_late;
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}
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}
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}, 1000);
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this.shell_channel.onmessage = $.proxy(this._handle_shell_reply, this);
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this.iopub_channel.onmessage = $.proxy(this._handle_iopub_message, this);
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this.stdin_channel.onmessage = $.proxy(this._handle_input_request, this);
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};
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/**
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* Handle a websocket entering the open state
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* sends session and cookie authentication info as first message.
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* Once all sockets are open, signal the Kernel.status_started event.
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* @method _ws_opened
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*/
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Kernel.prototype._ws_opened = function (evt) {
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// send the session id so the Session object Python-side
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// has the same identity
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evt.target.send(this.session_id + ':' + document.cookie);
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var channels = [this.shell_channel, this.iopub_channel, this.stdin_channel];
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for (var i=0; i < channels.length; i++) {
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// if any channel is not ready, don't trigger event.
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if ( !channels[i].readyState ) return;
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}
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// all events ready, trigger started event.
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$([IPython.events]).trigger('status_started.Kernel', {kernel: this});
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};
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/**
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* Stop the websocket channels.
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* @method stop_channels
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*/
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Kernel.prototype.stop_channels = function () {
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var channels = [this.shell_channel, this.iopub_channel, this.stdin_channel];
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for (var i=0; i < channels.length; i++) {
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if ( channels[i] !== null ) {
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channels[i].onclose = null;
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channels[i].close();
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}
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}
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this.shell_channel = this.iopub_channel = this.stdin_channel = null;
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};
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// Main public methods.
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// send a message on the Kernel's shell channel
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Kernel.prototype.send_shell_message = function (msg_type, content, callbacks, metadata) {
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var msg = this._get_msg(msg_type, content, metadata);
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this.shell_channel.send(JSON.stringify(msg));
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this.set_callbacks_for_msg(msg.header.msg_id, callbacks);
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return msg.header.msg_id;
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};
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/**
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* Get kernel info
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*
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* @param callback {function}
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* @method object_info
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*
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* When calling this method, pass a callback function that expects one argument.
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* The callback will be passed the complete `kernel_info_reply` message documented
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* [here](http://ipython.org/ipython-doc/dev/development/messaging.html#kernel-info)
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*/
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Kernel.prototype.kernel_info = function (callback) {
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var callbacks;
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if (callback) {
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callbacks = { shell : { reply : callback } };
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}
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return this.send_shell_message("kernel_info_request", {}, callbacks);
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};
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/**
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* Get info on an object
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*
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* @param objname {string}
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* @param callback {function}
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* @method object_info
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*
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* When calling this method, pass a callback function that expects one argument.
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* The callback will be passed the complete `object_info_reply` message documented
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* [here](http://ipython.org/ipython-doc/dev/development/messaging.html#object-information)
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*/
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Kernel.prototype.object_info = function (objname, callback) {
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var callbacks;
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if (callback) {
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callbacks = { shell : { reply : callback } };
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}
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if (typeof(objname) !== null && objname !== null) {
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var content = {
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oname : objname.toString(),
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detail_level : 0,
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};
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return this.send_shell_message("object_info_request", content, callbacks);
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}
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return;
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};
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/**
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* Execute given code into kernel, and pass result to callback.
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*
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* @async
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* @method execute
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* @param {string} code
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* @param [callbacks] {Object} With the following keys (all optional)
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* @param callbacks.shell.reply {function}
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* @param callbacks.shell.payload.[payload_name] {function}
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* @param callbacks.iopub.output {function}
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* @param callbacks.iopub.clear_output {function}
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* @param callbacks.input {function}
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* @param {object} [options]
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* @param [options.silent=false] {Boolean}
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* @param [options.user_expressions=empty_dict] {Dict}
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* @param [options.user_variables=empty_list] {List od Strings}
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* @param [options.allow_stdin=false] {Boolean} true|false
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*
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* @example
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*
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* The options object should contain the options for the execute call. Its default
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* values are:
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*
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* options = {
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* silent : true,
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* user_variables : [],
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* user_expressions : {},
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* allow_stdin : false
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* }
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*
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* When calling this method pass a callbacks structure of the form:
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*
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* callbacks = {
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* shell : {
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* reply : execute_reply_callback,
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* payload : {
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* set_next_input : set_next_input_callback,
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* }
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* },
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* iopub : {
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* output : output_callback,
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* clear_output : clear_output_callback,
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* },
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* input : raw_input_callback
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* }
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*
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* Each callback will be passed the entire message as a single arugment.
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* Payload handlers will be passed the corresponding payload and the execute_reply message.
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*/
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Kernel.prototype.execute = function (code, callbacks, options) {
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var content = {
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code : code,
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silent : true,
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store_history : false,
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user_variables : [],
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user_expressions : {},
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allow_stdin : false
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};
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callbacks = callbacks || {};
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if (callbacks.input !== undefined) {
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content.allow_stdin = true;
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}
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$.extend(true, content, options);
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$([IPython.events]).trigger('execution_request.Kernel', {kernel: this, content:content});
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return this.send_shell_message("execute_request", content, callbacks);
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};
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/**
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* When calling this method, pass a function to be called with the `complete_reply` message
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* as its only argument when it arrives.
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*
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* `complete_reply` is documented
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* [here](http://ipython.org/ipython-doc/dev/development/messaging.html#complete)
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*
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* @method complete
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* @param line {integer}
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* @param cursor_pos {integer}
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* @param callback {function}
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*
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*/
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Kernel.prototype.complete = function (line, cursor_pos, callback) {
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var callbacks;
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if (callback) {
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callbacks = { shell : { reply : callback } };
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}
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var content = {
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text : '',
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line : line,
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block : null,
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cursor_pos : cursor_pos
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};
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return this.send_shell_message("complete_request", content, callbacks);
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};
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Kernel.prototype.interrupt = function () {
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if (this.running) {
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$([IPython.events]).trigger('status_interrupting.Kernel', {kernel: this});
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$.post(utils.url_join_encode(this.kernel_url, "interrupt"));
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}
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};
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Kernel.prototype.kill = function () {
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if (this.running) {
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this.running = false;
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var settings = {
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cache : false,
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type : "DELETE"
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};
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$.ajax(utils.url_join_encode(this.kernel_url), settings);
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}
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};
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Kernel.prototype.send_input_reply = function (input) {
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var content = {
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value : input,
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};
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$([IPython.events]).trigger('input_reply.Kernel', {kernel: this, content:content});
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var msg = this._get_msg("input_reply", content);
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this.stdin_channel.send(JSON.stringify(msg));
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return msg.header.msg_id;
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};
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// Reply handlers
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Kernel.prototype.register_iopub_handler = function (msg_type, callback) {
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this._iopub_handlers[msg_type] = callback;
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};
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Kernel.prototype.get_iopub_handler = function (msg_type) {
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// get iopub handler for a specific message type
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return this._iopub_handlers[msg_type];
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};
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Kernel.prototype.get_callbacks_for_msg = function (msg_id) {
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// get callbacks for a specific message
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return this._msg_callbacks[msg_id];
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};
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Kernel.prototype.clear_callbacks_for_msg = function (msg_id) {
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if (this._msg_callbacks[msg_id] !== undefined ) {
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delete this._msg_callbacks[msg_id];
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}
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};
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/* Set callbacks for a particular message.
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* Callbacks should be a struct of the following form:
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* shell : {
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*
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* }
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*/
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Kernel.prototype.set_callbacks_for_msg = function (msg_id, callbacks) {
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if (callbacks) {
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// shallow-copy mapping, because we will modify it at the top level
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var cbcopy = this._msg_callbacks[msg_id] = {};
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cbcopy.shell = callbacks.shell;
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cbcopy.iopub = callbacks.iopub;
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cbcopy.input = callbacks.input;
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this._msg_callbacks[msg_id] = cbcopy;
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}
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};
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Kernel.prototype._handle_shell_reply = function (e) {
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var reply = $.parseJSON(e.data);
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$([IPython.events]).trigger('shell_reply.Kernel', {kernel: this, reply:reply});
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var content = reply.content;
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var metadata = reply.metadata;
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var parent_id = reply.parent_header.msg_id;
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var callbacks = this.get_callbacks_for_msg(parent_id);
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if (!callbacks || !callbacks.shell) {
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return;
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}
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var shell_callbacks = callbacks.shell;
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// clear callbacks on shell
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delete callbacks.shell;
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delete callbacks.input;
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if (!callbacks.iopub) {
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this.clear_callbacks_for_msg(parent_id);
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}
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if (shell_callbacks.reply !== undefined) {
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shell_callbacks.reply(reply);
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}
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if (content.payload && shell_callbacks.payload) {
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this._handle_payloads(content.payload, shell_callbacks.payload, reply);
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}
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};
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Kernel.prototype._handle_payloads = function (payloads, payload_callbacks, msg) {
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var l = payloads.length;
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// Payloads are handled by triggering events because we don't want the Kernel
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// to depend on the Notebook or Pager classes.
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for (var i=0; i<l; i++) {
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var payload = payloads[i];
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var callback = payload_callbacks[payload.source];
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if (callback) {
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callback(payload, msg);
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}
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}
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};
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Kernel.prototype._handle_status_message = function (msg) {
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var execution_state = msg.content.execution_state;
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var parent_id = msg.parent_header.msg_id;
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// dispatch status msg callbacks, if any
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var callbacks = this.get_callbacks_for_msg(parent_id);
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if (callbacks && callbacks.iopub && callbacks.iopub.status) {
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try {
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callbacks.iopub.status(msg);
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} catch (e) {
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console.log("Exception in status msg handler", e, e.stack);
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}
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}
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if (execution_state === 'busy') {
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$([IPython.events]).trigger('status_busy.Kernel', {kernel: this});
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} else if (execution_state === 'idle') {
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// clear callbacks on idle, there can be no more
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if (callbacks !== undefined) {
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delete callbacks.iopub;
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delete callbacks.input;
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if (!callbacks.shell) {
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this.clear_callbacks_for_msg(parent_id);
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}
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}
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// trigger status_idle event
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$([IPython.events]).trigger('status_idle.Kernel', {kernel: this});
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} else if (execution_state === 'restarting') {
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// autorestarting is distinct from restarting,
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// in that it means the kernel died and the server is restarting it.
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// status_restarting sets the notification widget,
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|
// autorestart shows the more prominent dialog.
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$([IPython.events]).trigger('status_autorestarting.Kernel', {kernel: this});
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$([IPython.events]).trigger('status_restarting.Kernel', {kernel: this});
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|
} else if (execution_state === 'dead') {
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this.stop_channels();
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|
$([IPython.events]).trigger('status_dead.Kernel', {kernel: this});
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}
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};
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// handle clear_output message
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Kernel.prototype._handle_clear_output = function (msg) {
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|
var callbacks = this.get_callbacks_for_msg(msg.parent_header.msg_id);
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|
if (!callbacks || !callbacks.iopub) {
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|
return;
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|
}
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|
var callback = callbacks.iopub.clear_output;
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|
if (callback) {
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|
callback(msg);
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|
}
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|
};
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|
// handle an output message (pyout, display_data, etc.)
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|
Kernel.prototype._handle_output_message = function (msg) {
|
|
|
var callbacks = this.get_callbacks_for_msg(msg.parent_header.msg_id);
|
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|
if (!callbacks || !callbacks.iopub) {
|
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|
return;
|
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|
}
|
|
|
var callback = callbacks.iopub.output;
|
|
|
if (callback) {
|
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|
callback(msg);
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|
}
|
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|
};
|
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|
|
// dispatch IOPub messages to respective handlers.
|
|
|
// each message type should have a handler.
|
|
|
Kernel.prototype._handle_iopub_message = function (e) {
|
|
|
var msg = $.parseJSON(e.data);
|
|
|
|
|
|
var handler = this.get_iopub_handler(msg.header.msg_type);
|
|
|
if (handler !== undefined) {
|
|
|
handler(msg);
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|
}
|
|
|
};
|
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|
|
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|
Kernel.prototype._handle_input_request = function (e) {
|
|
|
var request = $.parseJSON(e.data);
|
|
|
var header = request.header;
|
|
|
var content = request.content;
|
|
|
var metadata = request.metadata;
|
|
|
var msg_type = header.msg_type;
|
|
|
if (msg_type !== 'input_request') {
|
|
|
console.log("Invalid input request!", request);
|
|
|
return;
|
|
|
}
|
|
|
var callbacks = this.get_callbacks_for_msg(request.parent_header.msg_id);
|
|
|
if (callbacks) {
|
|
|
if (callbacks.input) {
|
|
|
callbacks.input(request);
|
|
|
}
|
|
|
}
|
|
|
};
|
|
|
|
|
|
|
|
|
IPython.Kernel = Kernel;
|
|
|
|
|
|
return IPython;
|
|
|
|
|
|
}(IPython));
|
|
|
|
|
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|
