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thebelab.js
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thebelab.js
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import $ from "jquery";
import CodeMirror from "codemirror";
import { Kernel } from "@jupyterlab/services";
import { ServerConnection } from "@jupyterlab/services";
import { OutputArea, OutputAreaModel } from "@jupyterlab/outputarea";
import { RenderMime, defaultRendererFactories } from "@jupyterlab/rendermime";
import "@jupyterlab/theme-light-extension/style/variables.css";
import "./index.css";
// events
export const events = $({});
export const on = function() {
events.on.apply(events, arguments);
};
export const one = function() {
events.one.apply(events, arguments);
};
export const off = function() {
events.off.apply(events, arguments);
};
// options
let _pageConfigData = undefined;
function getPageConfig(key) {
if (!_pageConfigData) {
_pageConfigData = {};
$("script[type='text/x-thebe-config']").map((i, el) => {
if (el.getAttribute("data-thebe-loaded")) {
// already loaded
return;
}
el.setAttribute("data-thebe-loaded", "true");
$(el).attr("data-thebe-executed", "true");
let thebeConfig = undefined;
eval(el.textContent);
if (thebeConfig) {
console.log("loading thebe config", thebeConfig);
$.extend(true, _pageConfigData, thebeConfig);
} else {
console.log("No thebeConfig found in ", el);
}
});
}
return _pageConfigData[key];
}
export function getOption(key, options, defaultValue) {
let value = undefined;
if (options) {
value = options[key];
if (value !== undefined) return value;
}
value = getPageConfig(key);
if (value !== undefined) return value;
return defaultValue;
}
function getBinderOptions(options) {
let binderOptions = {
ref: "master",
binderUrl: "https://beta.mybinder.org",
};
Object.assign(binderOptions, getPageConfig("binderOptions"));
Object.assign(binderOptions, (options || {}).binderOptions);
return binderOptions;
}
function getKernelOptions(options) {
let kernelOptions = {};
Object.assign(kernelOptions, getPageConfig("kernelOptions"));
Object.assign(kernelOptions, (options || {}).kernelOptions);
return kernelOptions;
}
// rendering cells
function renderCell(element, options) {
// render a single cell
// element should be a `<pre>` tag with some code in it
let $cell = $("<div class='thebelab-cell'/>");
let $element = $(element);
let source = $element.text().trim();
let renderMime = new RenderMime({
initialFactories: defaultRendererFactories,
});
let model = new OutputAreaModel();
let outputArea = new OutputArea({
model: model,
rendermime: renderMime,
});
$element.replaceWith($cell);
let $cm_element = $("<div class='thebelab-input'>");
$cell.append($cm_element);
$cell.append(
$("<button class='thebelab-button thebelab-run-button'>")
.text("run")
.click(execute)
);
window.oa = outputArea;
function execute() {
let kernel = $cell.data("kernel");
if (!kernel) {
console.error("No kernel connected");
outputArea.model.clear();
outputArea.model.add({
output_type: "stream",
name: "stderr",
text: "Kernel isn't ready yet!",
});
} else {
outputArea.future = kernel.requestExecute({ code: cm.getValue() });
}
return false;
}
$cell.append(outputArea.node);
let cm = new CodeMirror($cm_element[0], {
value: source,
mode: $element.data("language") || "python3",
extraKeys: {
"Shift-Enter": execute,
},
});
$cell.data("codemirror", cm);
return $cell;
}
export function renderAllCells(
{
selector = "[data-executable]",
} = {}
) {
// render all elements matching `selector` as cells.
// by default, this is all cells with `data-executable`
return $(selector).map((i, cell) => renderCell(cell));
}
export function hookupKernel(kernel, cells) {
// hooks up cells to the kernel
cells.map((i, cell) => {
$(cell).data("kernel", kernel);
});
}
// requesting Kernels
export function requestKernel(kernelOptions) {
// request a new Kernel
kernelOptions = kernelOptions || getKernelOptions();
if (kernelOptions.serverSettings) {
kernelOptions.serverSettings = ServerConnection.makeSettings(
kernelOptions.serverSettings
);
}
events.trigger("status", {
status: "starting",
message: "Starting Kernel",
});
let p = Kernel.startNew(kernelOptions);
p.then(kernel => {
events.trigger("status", {
status: "ready",
message: "Kernel is ready",
});
return kernel;
});
return p;
}
export function requestBinderKernel(
{
binderOptions,
kernelOptions,
}
) {
// request a Kernel from Binder
// this strings together requestBinder and requestKernel.
// returns a Promise for a running Kernel.
return requestBinder(binderOptions).then(serverSettings => {
kernelOptions.serverSettings = serverSettings;
return requestKernel(kernelOptions);
});
}
export function requestBinder(
{
repo,
ref = "master",
binderUrl = null,
} = {}
) {
// request a server from Binder
// returns a Promise that will resolve with a serverSettings dict
// populate fro defaults
let defaults = getBinderOptions();
repo = repo || defaults.repo;
console.log("binder url", binderUrl, defaults);
binderUrl = binderUrl || defaults.binderUrl;
ref = ref || defaults.ref;
// trim github.com from repo
repo = repo.replace(/^(https?:\/\/)?github.com\//, "");
// trim trailing or leading '/' on repo
repo = repo.replace(/(^\/)|(\/?$)/g, "");
// trailing / on binderUrl
binderUrl = binderUrl.replace(/(\/?$)/g, "");
let url = binderUrl + "/build/gh/" + repo + "/" + ref;
console.log("Binder build URL", url);
events.trigger("status", {
status: "building",
message: "Requesting build from binder",
});
return new Promise((resolve, reject) => {
let es = new EventSource(url);
es.onerror = err => {
console.error("Lost connection to " + url, err);
es.close();
events.trigger("status", {
status: "failed",
message: "Lost connection to Binder",
error: err,
});
reject(new Error(err));
};
let phase = null;
es.onmessage = evt => {
let msg = JSON.parse(evt.data);
if (msg.phase && msg.phase !== phase) {
phase = msg.phase.toLowerCase();
console.log("Binder phase: " + phase);
let status = phase;
if (status === "ready") {
status = "server-ready";
}
events.trigger("status", {
status: status,
message: "Binder is " + phase,
binderMessage: msg.message,
});
}
if (msg.message) {
console.log("Binder: " + msg.message);
}
switch (msg.phase) {
case "failed":
console.error("Failed to build", url, msg);
es.close();
reject(new Error(msg));
break;
case "ready":
es.close();
resolve(
ServerConnection.makeSettings({
baseUrl: msg.url,
token: msg.token,
})
);
break;
default:
// console.log(msg);
}
};
});
}
// do it all in one go
export function bootstrap(options) {
// bootstrap thebe on the page
options = options || {};
// bootstrap thebelab on the page
let cells = renderAllCells({
selector: getOption("cellSelector", options),
});
let kernelPromise;
let binderOptions = getBinderOptions(options);
let kernelOptions = getKernelOptions(options);
if (binderOptions.repo) {
kernelPromise = requestBinderKernel({
binderOptions: binderOptions,
kernelOptions: kernelOptions,
});
} else {
kernelPromise = requestKernel(kernelOptions);
}
kernelPromise.then(kernel => {
// debug
window.thebeKernel = kernel;
hookupKernel(kernel, cells);
});
}