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worker.ts
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// Copyright (c) Jupyter Development Team.
// Distributed under the terms of the Modified BSD License.
import type Pyodide from 'pyodide';
import type { DriveFS } from '@jupyterlite/contents';
import type { IPyodideWorkerKernel } from './tokens';
export class PyodideRemoteKernel {
constructor() {
this._initialized = new Promise((resolve, reject) => {
this._initializer = { resolve, reject };
});
}
/**
* Accept the URLs from the host
**/
async initialize(options: IPyodideWorkerKernel.IOptions): Promise<void> {
this._options = options;
if (options.location.includes(':')) {
const parts = options.location.split(':');
this._driveName = parts[0];
this._localPath = parts[1];
} else {
this._driveName = '';
this._localPath = options.location;
}
await this.initRuntime(options);
await this.initFilesystem(options);
await this.initPackageManager(options);
await this.initKernel(options);
await this.initGlobals(options);
this._initializer?.resolve();
}
protected async initRuntime(options: IPyodideWorkerKernel.IOptions): Promise<void> {
const { pyodideUrl, indexUrl } = options;
let loadPyodide: typeof Pyodide.loadPyodide;
if (pyodideUrl.endsWith('.mjs')) {
// note: this does not work at all in firefox
const pyodideModule: typeof Pyodide = await import(
/* webpackIgnore: true */ pyodideUrl
);
loadPyodide = pyodideModule.loadPyodide;
} else {
importScripts(pyodideUrl);
loadPyodide = (self as any).loadPyodide;
}
this._pyodide = await loadPyodide({ indexURL: indexUrl });
}
protected async initPackageManager(
options: IPyodideWorkerKernel.IOptions
): Promise<void> {
if (!this._options) {
throw new Error('Uninitialized');
}
const { pipliteWheelUrl, disablePyPIFallback, pipliteUrls } = this._options;
await this._pyodide.loadPackage(['micropip']);
// get piplite early enough to impact pyodide dependencies
await this._pyodide.runPythonAsync(`
import micropip
await micropip.install('${pipliteWheelUrl}', keep_going=True)
import piplite.piplite
piplite.piplite._PIPLITE_DISABLE_PYPI = ${disablePyPIFallback ? 'True' : 'False'}
piplite.piplite._PIPLITE_URLS = ${JSON.stringify(pipliteUrls)}
`);
}
protected async initKernel(options: IPyodideWorkerKernel.IOptions): Promise<void> {
// from this point forward, only use piplite (but not %pip)
await this._pyodide.runPythonAsync(`
await piplite.install(['sqlite3'], keep_going=True);
await piplite.install(['ipykernel'], keep_going=True);
await piplite.install(['pyodide_kernel'], keep_going=True);
await piplite.install(['ipython'], keep_going=True);
import pyodide_kernel
`);
// cd to the kernel location
if (options.mountDrive && this._localPath) {
await this._pyodide.runPythonAsync(`
import os;
os.chdir("${this._localPath}");
`);
}
}
protected async initGlobals(options: IPyodideWorkerKernel.IOptions): Promise<void> {
const { globals } = this._pyodide;
this._kernel = globals.get('pyodide_kernel').kernel_instance.copy();
this._stdout_stream = globals.get('pyodide_kernel').stdout_stream.copy();
this._stderr_stream = globals.get('pyodide_kernel').stderr_stream.copy();
this._interpreter = this._kernel.interpreter.copy();
this._interpreter.send_comm = this.sendComm.bind(this);
}
/**
* Setup custom Emscripten FileSystem
*/
protected async initFilesystem(
options: IPyodideWorkerKernel.IOptions
): Promise<void> {
if (options.mountDrive) {
const mountpoint = '/drive';
const { FS, PATH, ERRNO_CODES } = this._pyodide;
const { baseUrl } = options;
const { DriveFS } = await import('@jupyterlite/contents');
const driveFS = new DriveFS({
FS,
PATH,
ERRNO_CODES,
baseUrl,
driveName: this._driveName,
mountpoint,
});
FS.mkdir(mountpoint);
FS.mount(driveFS, {}, mountpoint);
FS.chdir(mountpoint);
this._driveFS = driveFS;
}
}
/**
* Recursively convert a Map to a JavaScript object
* @param obj A Map, Array, or other object to convert
*/
mapToObject(obj: any) {
const out: any = obj instanceof Array ? [] : {};
obj.forEach((value: any, key: string) => {
out[key] =
value instanceof Map || value instanceof Array
? this.mapToObject(value)
: value;
});
return out;
}
/**
* Format the response from the Pyodide evaluation.
*
* @param res The result object from the Pyodide evaluation
*/
formatResult(res: any): any {
if (!this._pyodide.isPyProxy(res)) {
return res;
}
// TODO: this is a bit brittle
const m = res.toJs();
const results = this.mapToObject(m);
return results;
}
/**
* Makes sure pyodide is ready before continuing, and cache the parent message.
*/
async setup(parent: any): Promise<void> {
await this._initialized;
this._kernel._parent_header = this._pyodide.toPy(parent);
}
/**
* Execute code with the interpreter.
*
* @param content The incoming message with the code to execute.
*/
async execute(content: any, parent: any) {
await this.setup(parent);
const publishExecutionResult = (
prompt_count: any,
data: any,
metadata: any
): void => {
const bundle = {
execution_count: prompt_count,
data: this.formatResult(data),
metadata: this.formatResult(metadata),
};
postMessage({
parentHeader: this.formatResult(this._kernel._parent_header)['header'],
bundle,
type: 'execute_result',
});
};
const publishExecutionError = (ename: any, evalue: any, traceback: any): void => {
const bundle = {
ename: ename,
evalue: evalue,
traceback: traceback,
};
postMessage({
parentHeader: this.formatResult(this._kernel._parent_header)['header'],
bundle,
type: 'execute_error',
});
};
const clearOutputCallback = (wait: boolean): void => {
const bundle = {
wait: this.formatResult(wait),
};
postMessage({
parentHeader: this.formatResult(this._kernel._parent_header)['header'],
bundle,
type: 'clear_output',
});
};
const displayDataCallback = (data: any, metadata: any, transient: any): void => {
const bundle = {
data: this.formatResult(data),
metadata: this.formatResult(metadata),
transient: this.formatResult(transient),
};
postMessage({
parentHeader: this.formatResult(this._kernel._parent_header)['header'],
bundle,
type: 'display_data',
});
};
const updateDisplayDataCallback = (
data: any,
metadata: any,
transient: any
): void => {
const bundle = {
data: this.formatResult(data),
metadata: this.formatResult(metadata),
transient: this.formatResult(transient),
};
postMessage({
parentHeader: this.formatResult(this._kernel._parent_header)['header'],
bundle,
type: 'update_display_data',
});
};
const publishStreamCallback = (name: any, text: any): void => {
const bundle = {
name: this.formatResult(name),
text: this.formatResult(text),
};
postMessage({
parentHeader: this.formatResult(this._kernel._parent_header)['header'],
bundle,
type: 'stream',
});
};
this._stdout_stream.publish_stream_callback = publishStreamCallback;
this._stderr_stream.publish_stream_callback = publishStreamCallback;
this._interpreter.display_pub.clear_output_callback = clearOutputCallback;
this._interpreter.display_pub.display_data_callback = displayDataCallback;
this._interpreter.display_pub.update_display_data_callback =
updateDisplayDataCallback;
this._interpreter.displayhook.publish_execution_result = publishExecutionResult;
this._interpreter.input = this.input.bind(this);
this._interpreter.getpass = this.getpass.bind(this);
const res = await this._kernel.run(content.code);
const results = this.formatResult(res);
if (results['status'] === 'error') {
publishExecutionError(results['ename'], results['evalue'], results['traceback']);
}
return results;
}
/**
* Complete the code submitted by a user.
*
* @param content The incoming message with the code to complete.
*/
async complete(content: any, parent: any) {
await this.setup(parent);
const res = this._kernel.complete(content.code, content.cursor_pos);
const results = this.formatResult(res);
return results;
}
/**
* Inspect the code submitted by a user.
*
* @param content The incoming message with the code to inspect.
*/
async inspect(
content: { code: string; cursor_pos: number; detail_level: 0 | 1 },
parent: any
) {
await this.setup(parent);
const res = this._kernel.inspect(
content.code,
content.cursor_pos,
content.detail_level
);
const results = this.formatResult(res);
return results;
}
/**
* Check code for completeness submitted by a user.
*
* @param content The incoming message with the code to check.
*/
async isComplete(content: { code: string }, parent: any) {
await this.setup(parent);
const res = this._kernel.is_complete(content.code);
const results = this.formatResult(res);
return results;
}
/**
* Respond to the commInfoRequest.
*
* @param content The incoming message with the comm target name.
*/
async commInfo(content: any, parent: any) {
await this.setup(parent);
const res = this._kernel.comm_info(content.target_name);
const results = this.formatResult(res);
return {
comms: results,
status: 'ok',
};
}
/**
* Respond to the commOpen.
*
* @param content The incoming message with the comm open.
*/
async commOpen(content: any, parent: any) {
await this.setup(parent);
const res = this._kernel.comm_manager.comm_open(this._pyodide.toPy(content));
const results = this.formatResult(res);
return results;
}
/**
* Respond to the commMsg.
*
* @param content The incoming message with the comm msg.
*/
async commMsg(content: any, parent: any) {
await this.setup(parent);
const res = this._kernel.comm_manager.comm_msg(this._pyodide.toPy(content));
const results = this.formatResult(res);
return results;
}
/**
* Respond to the commClose.
*
* @param content The incoming message with the comm close.
*/
async commClose(content: any, parent: any) {
await this.setup(parent);
const res = this._kernel.comm_manager.comm_close(this._pyodide.toPy(content));
const results = this.formatResult(res);
return results;
}
/**
* Resolve the input request by getting back the reply from the main thread
*
* @param content The incoming message with the reply
*/
async inputReply(content: any, parent: any) {
await this.setup(parent);
this._resolveInputReply(content);
}
/**
* Send a input request to the front-end.
*
* @param prompt the text to show at the prompt
* @param password Is the request for a password?
*/
async sendInputRequest(prompt: string, password: boolean) {
const content = {
prompt,
password,
};
postMessage({
type: 'input_request',
parentHeader: this.formatResult(this._kernel._parent_header)['header'],
content,
});
}
async getpass(prompt: string) {
prompt = typeof prompt === 'undefined' ? '' : prompt;
await this.sendInputRequest(prompt, true);
const replyPromise = new Promise((resolve) => {
this._resolveInputReply = resolve;
});
const result: any = await replyPromise;
return result['value'];
}
async input(prompt: string) {
prompt = typeof prompt === 'undefined' ? '' : prompt;
await this.sendInputRequest(prompt, false);
const replyPromise = new Promise((resolve) => {
this._resolveInputReply = resolve;
});
const result: any = await replyPromise;
return result['value'];
}
/**
* Send a comm message to the front-end.
*
* @param type The type of the comm message.
* @param content The content.
* @param metadata The metadata.
* @param ident The ident.
* @param buffers The binary buffers.
*/
async sendComm(type: string, content: any, metadata: any, ident: any, buffers: any) {
postMessage({
type: type,
content: this.formatResult(content),
metadata: this.formatResult(metadata),
ident: this.formatResult(ident),
buffers: this.formatResult(buffers),
parentHeader: this.formatResult(this._kernel._parent_header)['header'],
});
}
/**
* Initialization options.
*/
protected _options: IPyodideWorkerKernel.IOptions | null = null;
/**
* A promise that resolves when all initiaization is complete.
*/
protected _initialized: Promise<void>;
private _initializer: {
reject: () => void;
resolve: () => void;
} | null = null;
protected _pyodide: Pyodide.PyodideInterface = null as any;
/** TODO: real typing */
protected _localPath = '';
protected _driveName = '';
protected _kernel: any;
protected _interpreter: any;
protected _stdout_stream: any;
protected _stderr_stream: any;
protected _resolveInputReply: any;
protected _driveFS: DriveFS | null = null;
}