69c783f861
* Use direct message handler functions * Remove unused targetPopupId * Make target a member of FrontendApiSender * Rename frameId to parentFrameId for clarity * Remove _parentFrameId * Rename _parentId to _parentPopupId for clarity
129 lines
3.9 KiB
JavaScript
129 lines
3.9 KiB
JavaScript
/*
|
|
* Copyright (C) 2019-2020 Yomichan Authors
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
|
|
class FrontendApiSender {
|
|
constructor(target) {
|
|
this._target = target;
|
|
this._senderId = yomichan.generateId(16);
|
|
this._ackTimeout = 3000; // 3 seconds
|
|
this._responseTimeout = 10000; // 10 seconds
|
|
this._callbacks = new Map();
|
|
this._disconnected = false;
|
|
this._nextId = 0;
|
|
this._port = null;
|
|
}
|
|
|
|
invoke(action, params) {
|
|
if (this._disconnected) {
|
|
// attempt to reconnect the next time
|
|
this._disconnected = false;
|
|
return Promise.reject(new Error('Disconnected'));
|
|
}
|
|
|
|
if (this._port === null) {
|
|
this._createPort();
|
|
}
|
|
|
|
const id = `${this._nextId}`;
|
|
++this._nextId;
|
|
|
|
return new Promise((resolve, reject) => {
|
|
const info = {id, resolve, reject, ack: false, timer: null};
|
|
this._callbacks.set(id, info);
|
|
info.timer = setTimeout(() => this._onError(id, 'Timeout (ack)'), this._ackTimeout);
|
|
|
|
this._port.postMessage({id, action, params, target: this._target, senderId: this._senderId});
|
|
});
|
|
}
|
|
|
|
_createPort() {
|
|
this._port = chrome.runtime.connect(null, {name: 'backend-api-forwarder'});
|
|
this._port.onDisconnect.addListener(this._onDisconnect.bind(this));
|
|
this._port.onMessage.addListener(this._onMessage.bind(this));
|
|
}
|
|
|
|
_onMessage({type, id, data, senderId}) {
|
|
if (senderId !== this._senderId) { return; }
|
|
switch (type) {
|
|
case 'ack':
|
|
this._onAck(id);
|
|
break;
|
|
case 'result':
|
|
this._onResult(id, data);
|
|
break;
|
|
}
|
|
}
|
|
|
|
_onDisconnect() {
|
|
this._disconnected = true;
|
|
this._port = null;
|
|
|
|
for (const id of this._callbacks.keys()) {
|
|
this._onError(id, 'Disconnected');
|
|
}
|
|
}
|
|
|
|
_onAck(id) {
|
|
const info = this._callbacks.get(id);
|
|
if (typeof info === 'undefined') {
|
|
yomichan.logWarning(new Error(`ID ${id} not found for ack`));
|
|
return;
|
|
}
|
|
|
|
if (info.ack) {
|
|
yomichan.logWarning(new Error(`Request ${id} already ack'd`));
|
|
return;
|
|
}
|
|
|
|
info.ack = true;
|
|
clearTimeout(info.timer);
|
|
info.timer = setTimeout(() => this._onError(id, 'Timeout (response)'), this._responseTimeout);
|
|
}
|
|
|
|
_onResult(id, data) {
|
|
const info = this._callbacks.get(id);
|
|
if (typeof info === 'undefined') {
|
|
yomichan.logWarning(new Error(`ID ${id} not found`));
|
|
return;
|
|
}
|
|
|
|
if (!info.ack) {
|
|
yomichan.logWarning(new Error(`Request ${id} not ack'd`));
|
|
return;
|
|
}
|
|
|
|
this._callbacks.delete(id);
|
|
clearTimeout(info.timer);
|
|
info.timer = null;
|
|
|
|
if (typeof data.error !== 'undefined') {
|
|
info.reject(jsonToError(data.error));
|
|
} else {
|
|
info.resolve(data.result);
|
|
}
|
|
}
|
|
|
|
_onError(id, reason) {
|
|
const info = this._callbacks.get(id);
|
|
if (typeof info === 'undefined') { return; }
|
|
this._callbacks.delete(id);
|
|
info.timer = null;
|
|
info.reject(new Error(reason));
|
|
}
|
|
}
|