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/**
* @license
* Copyright 2024 Google Inc.
* SPDX-License-Identifier: Apache-2.0
*/
import type * as Bidi from 'chromium-bidi/lib/cjs/protocol/protocol.js';
import {EventEmitter} from '../../common/EventEmitter.js';
import {debugError} from '../../common/util.js';
import {
bubble,
inertIfDisposed,
throwIfDisposed,
} from '../../util/decorators.js';
import {DisposableStack, disposeSymbol} from '../../util/disposable.js';
import {Browser} from './Browser.js';
import type {BidiEvents, Commands, Connection} from './Connection.js';
// TODO: Once Chrome supports session.status properly, uncomment this block.
// const MAX_RETRIES = 5;
/**
* @internal
*/
export class Session
extends EventEmitter<BidiEvents & {ended: {reason: string}}>
implements Connection<BidiEvents & {ended: {reason: string}}>
{
static async from(
connection: Connection,
capabilities: Bidi.Session.CapabilitiesRequest
): Promise<Session> {
// Wait until the session is ready.
//
// TODO: Once Chrome supports session.status properly, uncomment this block
// and remove `getBiDiConnection` in BrowserConnector.
// let status = {message: '', ready: false};
// for (let i = 0; i < MAX_RETRIES; ++i) {
// status = (await connection.send('session.status', {})).result;
// if (status.ready) {
// break;
// }
// // Backoff a little bit each time.
// await new Promise(resolve => {
// return setTimeout(resolve, (1 << i) * 100);
// });
// }
// if (!status.ready) {
// throw new Error(status.message);
// }
let result;
try {
result = (
await connection.send('session.new', {
capabilities,
})
).result;
} catch (err) {
// Chrome does not support session.new.
debugError(err);
result = {
sessionId: '',
capabilities: {
acceptInsecureCerts: false,
browserName: '',
browserVersion: '',
platformName: '',
setWindowRect: false,
webSocketUrl: '',
userAgent: '',
},
} satisfies Bidi.Session.NewResult;
}
const session = new Session(connection, result);
await session.#initialize();
return session;
}
#reason: string | undefined;
readonly #disposables = new DisposableStack();
readonly #info: Bidi.Session.NewResult;
readonly browser!: Browser;
@bubble()
accessor connection: Connection;
private constructor(connection: Connection, info: Bidi.Session.NewResult) {
super();
this.#info = info;
this.connection = connection;
}
async #initialize(): Promise<void> {
// SAFETY: We use `any` to allow assignment of the readonly property.
(this as any).browser = await Browser.from(this);
const browserEmitter = this.#disposables.use(this.browser);
browserEmitter.once('closed', ({reason}) => {
this.dispose(reason);
});
// TODO: Currently, some implementations do not emit navigationStarted event
// for fragment navigations (as per spec) and some do. This could emits a
// synthetic navigationStarted to work around this inconsistency.
const seen = new WeakSet();
this.on('browsingContext.fragmentNavigated', info => {
if (seen.has(info)) {
return;
}
seen.add(info);
this.emit('browsingContext.navigationStarted', info);
this.emit('browsingContext.fragmentNavigated', info);
});
}
get capabilities(): Bidi.Session.NewResult['capabilities'] {
return this.#info.capabilities;
}
get disposed(): boolean {
return this.ended;
}
get ended(): boolean {
return this.#reason !== undefined;
}
get id(): string {
return this.#info.sessionId;
}
@inertIfDisposed
private dispose(reason?: string): void {
this.#reason = reason;
this[disposeSymbol]();
}
/**
* Currently, there is a 1:1 relationship between the session and the
* session. In the future, we might support multiple sessions and in that
* case we always needs to make sure that the session for the right session
* object is used, so we implement this method here, although it's not defined
* in the spec.
*/
@throwIfDisposed<Session>(session => {
// SAFETY: By definition of `disposed`, `#reason` is defined.
return session.#reason!;
})
async send<T extends keyof Commands>(
method: T,
params: Commands[T]['params']
): Promise<{result: Commands[T]['returnType']}> {
return await this.connection.send(method, params);
}
@throwIfDisposed<Session>(session => {
// SAFETY: By definition of `disposed`, `#reason` is defined.
return session.#reason!;
})
async subscribe(
events: [string, ...string[]],
contexts?: [string, ...string[]]
): Promise<void> {
await this.send('session.subscribe', {
events,
contexts,
});
}
@throwIfDisposed<Session>(session => {
// SAFETY: By definition of `disposed`, `#reason` is defined.
return session.#reason!;
})
async addIntercepts(
events: [string, ...string[]],
contexts?: [string, ...string[]]
): Promise<void> {
await this.send('session.subscribe', {
events,
contexts,
});
}
@throwIfDisposed<Session>(session => {
// SAFETY: By definition of `disposed`, `#reason` is defined.
return session.#reason!;
})
async end(): Promise<void> {
try {
await this.send('session.end', {});
} finally {
this.dispose(`Session already ended.`);
}
}
[disposeSymbol](): void {
this.#reason ??=
'Session already destroyed, probably because the connection broke.';
this.emit('ended', {reason: this.#reason});
this.#disposables.dispose();
super[disposeSymbol]();
}
}
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