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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/**
* This @file implements the child side of Conduits, an abstraction over
* Fission IPC for extension API subject. See {@link ConduitsParent.sys.mjs}
* for more details about the overall design.
*
* @typedef {object} MessageData
* @property {ConduitID} [target]
* @property {ConduitID} [sender]
* @property {boolean} query
* @property {object} arg
*/
/**
* Base class for both child (Point) and parent (Broadcast) side of conduits,
* handles setting up send/receive method stubs.
*/
export class BaseConduit {
/**
* @param {object} subject
* @param {ConduitAddress} address
*/
constructor(subject, address) {
this.subject = subject;
this.address = address;
this.id = address.id;
for (let name of address.send || []) {
this[`send${name}`] = this._send.bind(this, name, false);
}
for (let name of address.query || []) {
this[`query${name}`] = this._send.bind(this, name, true);
}
this.recv = new Map();
for (let name of address.recv || []) {
let method = this.subject[`recv${name}`];
if (!method) {
throw new Error(`recv${name} not found for conduit ${this.id}`);
}
this.recv.set(name, method.bind(this.subject));
}
}
/**
* Internal, partially @abstract, uses the actor to send the message/query.
*
* @param {string} method
* @param {boolean} query Flag indicating a response is expected.
* @param {JSWindowActor} actor
* @param {MessageData} data
* @returns {Promise?}
*/
_send(method, query, actor, data) {
if (query) {
return actor.sendQuery(method, data);
}
actor.sendAsyncMessage(method, data);
}
/**
* Internal, calls the specific recvX method based on the message.
*
* @param {string} name Message/method name.
* @param {object} arg Message data, the one and only method argument.
* @param {object} meta Metadata about the method call.
*/
async _recv(name, arg, meta) {
let method = this.recv.get(name);
if (!method) {
throw new Error(`recv${name} not found for conduit ${this.id}`);
}
try {
return await method(arg, meta);
} catch (e) {
if (meta.query) {
return Promise.reject(e);
}
Cu.reportError(e);
}
}
}
/**
* Child side conduit, can only send/receive point-to-point messages via the
* one specific ConduitsChild actor.
*/
export class PointConduit extends BaseConduit {
constructor(subject, address, actor) {
super(subject, address);
this.actor = actor;
this.actor.sendAsyncMessage("ConduitOpened", { arg: address });
}
/**
* Internal, sends messages via the actor, used by sendX stubs.
*
* @param {string} method
* @param {boolean} query
* @param {object?} arg
* @returns {Promise?}
*/
_send(method, query, arg = {}) {
if (!this.actor) {
throw new Error(`send${method} on closed conduit ${this.id}`);
}
let sender = this.id;
return super._send(method, query, this.actor, { arg, query, sender });
}
/**
* Closes the conduit from further IPC, notifies the parent side by default.
*
* @param {boolean} silent
*/
close(silent = false) {
let { actor } = this;
if (actor) {
this.actor = null;
actor.conduits.delete(this.id);
if (!silent) {
// Catch any exceptions that can occur if the conduit is closed while
// the actor is being destroyed due to the containing browser being closed.
// This should be treated as if the silent flag was passed.
try {
actor.sendAsyncMessage("ConduitClosed", { sender: this.id });
} catch (ex) {}
}
}
this.closeCallback?.();
this.closeCallback = null;
}
/**
* Set the callback to be called when the conduit is closed.
*
* @param {Function} callback
*/
setCloseCallback(callback) {
this.closeCallback = callback;
}
}
/**
* Implements the child side of the Conduits actor, manages conduit lifetimes.
*/
export class ConduitsChild extends JSWindowActorChild {
constructor() {
super();
this.conduits = new Map();
}
/**
* Public entry point a child-side subject uses to open a conduit.
*
* @param {object} subject
* @param {ConduitAddress} address
* @returns {PointConduit}
*/
openConduit(subject, address) {
let conduit = new PointConduit(subject, address, this);
this.conduits.set(conduit.id, conduit);
return conduit;
}
/**
* JSWindowActor method, routes the message to the target subject.
*
* @param {object} options
* @param {string} options.name
* @param {MessageData | MessageData[]} options.data
* @returns {Promise?}
*/
receiveMessage({ name, data }) {
// Batch of webRequest events, run each and return results, ignoring errors.
if (Array.isArray(data)) {
let run = data => this.receiveMessage({ name, data });
return Promise.all(data.map(data => run(data).catch(Cu.reportError)));
}
let { target, arg, query, sender } = data;
let conduit = this.conduits.get(target);
if (!conduit) {
throw new Error(`${name} for closed conduit ${target}: ${uneval(arg)}`);
}
return conduit._recv(name, arg, { sender, query, actor: this });
}
/**
* JSWindowActor method, ensure cleanup.
*/
didDestroy() {
for (let conduit of this.conduits.values()) {
conduit.close(true);
}
this.conduits.clear();
}
}
/**
* Child side of the Conduits process actor. Same code as JSWindowActor.
*/
export class ProcessConduitsChild extends JSProcessActorChild {
constructor() {
super();
this.conduits = new Map();
}
openConduit = ConduitsChild.prototype.openConduit;
receiveMessage = ConduitsChild.prototype.receiveMessage;
willDestroy = ConduitsChild.prototype.willDestroy;
didDestroy = ConduitsChild.prototype.didDestroy;
}
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