/
manager.ts
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/
manager.ts
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// Copyright (c) Jupyter Development Team.
// Distributed under the terms of the Modified BSD License.
import { Poll } from '@jupyterlab/coreutils';
import { ArrayExt, IIterator, iter } from '@phosphor/algorithm';
import { JSONExt } from '@phosphor/coreutils';
import { ISignal, Signal } from '@phosphor/signaling';
import { ServerConnection } from '..';
import { TerminalSession } from './terminal';
/**
* A terminal session manager.
*/
export class TerminalManager implements TerminalSession.IManager {
/**
* Construct a new terminal manager.
*/
constructor(options: TerminalManager.IOptions = {}) {
this.serverSettings =
options.serverSettings || ServerConnection.makeSettings();
// Check if terminals are available
if (!TerminalSession.isAvailable()) {
this._ready = Promise.reject('Terminals unavailable');
this._ready.catch(_ => undefined);
return;
}
// Initialize internal data then start polling.
this._ready = this.requestRunning()
.then(_ => undefined)
.catch(_ => undefined)
.then(() => {
if (this.isDisposed) {
return;
}
this._isReady = true;
});
// Start polling with exponential backoff.
this._pollModels = new Poll({
auto: false,
factory: () => this.requestRunning(),
frequency: {
interval: 10 * 1000,
backoff: true,
max: 300 * 1000
},
name: `@jupyterlab/services:TerminalManager#models`,
standby: options.standby || 'when-hidden'
});
void this.ready.then(() => {
void this._pollModels.start();
});
}
/**
* A signal emitted when the running terminals change.
*/
get runningChanged(): ISignal<this, TerminalSession.IModel[]> {
return this._runningChanged;
}
/**
* A signal emitted when there is a connection failure.
*/
get connectionFailure(): ISignal<this, Error> {
return this._connectionFailure;
}
/**
* Test whether the terminal manager is disposed.
*/
get isDisposed(): boolean {
return this._isDisposed;
}
/**
* The server settings of the manager.
*/
readonly serverSettings: ServerConnection.ISettings;
/**
* Test whether the manager is ready.
*/
get isReady(): boolean {
return this._isReady;
}
/**
* Dispose of the resources used by the manager.
*/
dispose(): void {
if (this.isDisposed) {
return;
}
this._isDisposed = true;
this._models.length = 0;
this._pollModels.dispose();
Signal.clearData(this);
}
/**
* A promise that fulfills when the manager is ready.
*/
get ready(): Promise<void> {
return this._ready;
}
/**
* Whether the terminal service is available.
*/
isAvailable(): boolean {
return TerminalSession.isAvailable();
}
/**
* Create an iterator over the most recent running terminals.
*
* @returns A new iterator over the running terminals.
*/
running(): IIterator<TerminalSession.IModel> {
return iter(this._models);
}
/**
* Create a new terminal session.
*
* @param options - The options used to connect to the session.
*
* @returns A promise that resolves with the terminal instance.
*
* #### Notes
* The manager `serverSettings` will be used unless overridden in the
* options.
*/
async startNew(
options?: TerminalSession.IOptions
): Promise<TerminalSession.ISession> {
const session = await TerminalSession.startNew(this._getOptions(options));
this._onStarted(session);
return session;
}
/*
* Connect to a running session.
*
* @param name - The name of the target session.
*
* @param options - The options used to connect to the session.
*
* @returns A promise that resolves with the new session instance.
*
* #### Notes
* The manager `serverSettings` will be used unless overridden in the
* options.
*/
async connectTo(
name: string,
options?: TerminalSession.IOptions
): Promise<TerminalSession.ISession> {
const session = await TerminalSession.connectTo(
name,
this._getOptions(options)
);
this._onStarted(session);
return session;
}
/**
* Force a refresh of the running sessions.
*
* #### Notes
* This is intended to be called only in response to a user action,
* since the manager maintains its internal state.
*/
async refreshRunning(): Promise<void> {
await this._pollModels.refresh();
await this._pollModels.tick;
}
/**
* Shut down a terminal session by name.
*/
async shutdown(name: string): Promise<void> {
const models = this._models;
const sessions = this._sessions;
const index = ArrayExt.findFirstIndex(models, model => model.name === name);
if (index === -1) {
return;
}
// Proactively remove the model.
models.splice(index, 1);
this._runningChanged.emit(models.slice());
// Delete and dispose the session locally.
sessions.forEach(session => {
if (session.name === name) {
sessions.delete(session);
session.dispose();
}
});
// Shut down the remote session.
await TerminalSession.shutdown(name, this.serverSettings);
}
/**
* Shut down all terminal sessions.
*
* @returns A promise that resolves when all of the sessions are shut down.
*/
async shutdownAll(): Promise<void> {
// Update the list of models then shut down every session.
try {
await this.requestRunning();
await Promise.all(
this._models.map(({ name }) =>
TerminalSession.shutdown(name, this.serverSettings)
)
);
} finally {
// Dispose every kernel and clear the set.
this._sessions.forEach(session => {
session.dispose();
});
this._sessions.clear();
// Remove all models even if we had an error.
if (this._models.length) {
this._models.length = 0;
this._runningChanged.emit([]);
}
}
}
/**
* Execute a request to the server to poll running terminals and update state.
*/
protected async requestRunning(): Promise<void> {
const models = await TerminalSession.listRunning(this.serverSettings).catch(
err => {
// Check for a network error, or a 503 error, which is returned
// by a JupyterHub when a server is shut down.
if (
err instanceof ServerConnection.NetworkError ||
(err.response && err.response.status === 503)
) {
this._connectionFailure.emit(err);
return [] as TerminalSession.IModel[];
}
throw err;
}
);
if (this.isDisposed) {
return;
}
if (!JSONExt.deepEqual(models, this._models)) {
const names = models.map(({ name }) => name);
const sessions = this._sessions;
sessions.forEach(session => {
if (names.indexOf(session.name) === -1) {
session.dispose();
sessions.delete(session);
}
});
this._models = models.slice();
this._runningChanged.emit(models);
}
}
/**
* Get a set of options to pass.
*/
private _getOptions(
options: TerminalSession.IOptions = {}
): TerminalSession.IOptions {
return { ...options, serverSettings: this.serverSettings };
}
/**
* Handle a session starting.
*/
private _onStarted(session: TerminalSession.ISession): void {
let name = session.name;
this._sessions.add(session);
let index = ArrayExt.findFirstIndex(
this._models,
value => value.name === name
);
if (index === -1) {
this._models.push(session.model);
this._runningChanged.emit(this._models.slice());
}
session.terminated.connect(() => {
this._onTerminated(name);
});
}
/**
* Handle a session terminating.
*/
private _onTerminated(name: string): void {
let index = ArrayExt.findFirstIndex(
this._models,
value => value.name === name
);
if (index !== -1) {
this._models.splice(index, 1);
this._runningChanged.emit(this._models.slice());
}
const sessions = this._sessions;
sessions.forEach(session => {
if (session.name === name) {
sessions.delete(session);
}
});
}
private _isDisposed = false;
private _isReady = false;
private _models: TerminalSession.IModel[] = [];
private _pollModels: Poll;
private _sessions = new Set<TerminalSession.ISession>();
private _ready: Promise<void>;
private _runningChanged = new Signal<this, TerminalSession.IModel[]>(this);
private _connectionFailure = new Signal<this, Error>(this);
}
/**
* The namespace for TerminalManager statics.
*/
export namespace TerminalManager {
/**
* The options used to initialize a terminal manager.
*/
export interface IOptions {
/**
* The server settings used by the manager.
*/
serverSettings?: ServerConnection.ISettings;
/**
* When the manager stops polling the API. Defaults to `when-hidden`.
*/
standby?: Poll.Standby;
}
}