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extension.js
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extension.js
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/* extension.js
*
* 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 2 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 <http://www.gnu.org/licenses/>.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
import GObject from "gi://GObject";
import GLib from "gi://GLib";
import Gio from "gi://Gio";
import Clutter from "gi://Clutter";
import St from "gi://St";
import * as Main from "resource:///org/gnome/shell/ui/main.js";
import * as PanelMenu from "resource:///org/gnome/shell/ui/panelMenu.js";
import { Extension } from "resource:///org/gnome/shell/extensions/extension.js";
const refreshInterval = 3;
const speedUnits = [
"B/s",
"K/s",
"M/s",
"G/s",
"T/s",
"P/s",
"E/s",
"Z/s",
"Y/s",
];
// `ifb`: Created by python-based bandwidth manager "traffictoll".
// `lxdbr`: Created by lxd container manager.
// Add more virtual interface prefixes here.
const virtualIfacePrefixes = [
"lo",
"ifb",
"lxdbr",
"virbr",
"br",
"vnet",
"tun",
"tap",
"docker",
"utun",
"wg",
"veth",
];
const isVirtualIface = (name) => {
return virtualIfacePrefixes.some((prefix) => {
return name.startsWith(prefix);
});
};
const formatSpeedWithUnit = (amount) => {
let unitIndex = 0;
while (amount >= 1000 && unitIndex < speedUnits.length - 1) {
amount /= 1000;
++unitIndex;
}
let digits = 0;
// Instead of showing 0.00123456 as 0.00, show it as 0.
if (amount >= 100 || amount - 0 < 0.01) {
// 100 M/s, 200 K/s, 300 B/s.
digits = 0;
} else if (amount >= 10) {
// 10.1 M/s, 20.2 K/s, 30.3 B/s.
digits = 1;
} else {
// 1.01 M/s, 2.02 K/s, 3.03 B/s.
digits = 2;
}
// See <https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toFixed>.
return `${amount.toFixed(digits)} ${speedUnits[unitIndex]}`;
};
const toSpeedString = (speed) => {
return `↓ ${formatSpeedWithUnit(speed["down"])} ↑ ${formatSpeedWithUnit(
speed["up"],
)}`;
};
const Indicator = GObject.registerClass(
class Indicator extends PanelMenu.Button {
_init() {
// menuAlignment, nameText, dontCreateMenu.
super._init(0.0, "Net Speed", true);
this._label = new St.Label({
y_align: Clutter.ActorAlign.CENTER,
text: "---",
});
this.add_child(this._label);
}
setText(text) {
return this._label.set_text(text);
}
},
);
export default class NetSpeed extends Extension {
constructor(metadata) {
super(metadata);
this._metadata = metadata;
this._uuid = metadata.uuid;
this._textDecoder = new TextDecoder();
this._lastTotalDownBytes = 0;
this._lastTotalUpBytes = 0;
this._lastTotalDownBits = 0;
this._lastTotalUpBits = 0;
}
enable() {
this._lastTotalDownBytes = 0;
this._lastTotalUpBytes = 0;
this._lastTotalDownBits = 0;
this._lastTotalUpBits = 0;
this._indicator = new Indicator();
// role, indicator, position, box.
// -1 is not OK, because it will show in the right side of system menu.
Main.panel.addToStatusArea(this._uuid, this._indicator, 0, "right");
this._timeout = GLib.timeout_add_seconds(
GLib.PRIORITY_DEFAULT,
refreshInterval,
() => {
const speed = this.getCurrentNetSpeed(refreshInterval);
const text = toSpeedString(speed);
// console.log(text);
this._indicator.setText(text);
// Run as loop, not once.
return GLib.SOURCE_CONTINUE;
},
);
}
disable() {
if (this._indicator != null) {
this._indicator.destroy();
this._indicator = null;
}
if (this._timeout != null) {
GLib.source_remove(this._timeout);
this._timeout = null;
}
}
getCurrentNetSpeed(refreshInterval) {
const speed = { down: 0, up: 0 };
try {
const inputFile = Gio.File.new_for_path("/proc/net/dev");
const [, content] = inputFile.load_contents(null);
// See <https://github.com/GNOME/gjs/blob/master/doc/ByteArray.md#tostringauint8array-encodingstringstring>.
//
// `ByteArray` is deprecated with ES Module, standard JavaScript
// `TextDecoder` should be used here.
const lines = this._textDecoder.decode(content).split("\n");
// Caculate the sum of all interfaces line by line.
let totalDownBytes = 0;
let totalUpBytes = 0;
let totalDownBits = 0;
let totalUpBits = 0;
for (let i = 0; i < lines.length; ++i) {
const fields = lines[i].trim().split(/\W+/);
if (fields.length <= 2) {
continue;
}
// Skip virtual interfaces.
const iface = fields[0];
const currentInterfaceDownBytes = Number.parseInt(fields[1]);
const currentInterfaceUpBytes = Number.parseInt(fields[9]);
if (
isNaN(currentInterfaceDownBytes) ||
isNaN(currentInterfaceUpBytes) ||
isVirtualIface(iface)
) {
continue;
}
totalDownBytes += currentInterfaceDownBytes;
totalUpBytes += currentInterfaceUpBytes;
totalDownBits += totalDownBytes * 8;
totalUpBits += totalUpBytes * 8;
}
if (this._lastTotalDownBytes === 0) {
this._lastTotalDownBytes = totalDownBytes;
this._lastTotalDownBits = totalDownBits;
}
if (this._lastTotalUpBytes === 0) {
this._lastTotalUpBytes = totalUpBytes;
this._lastTotalUpBits = totalUpBits;
}
speed["down"] =
(totalDownBits - this._lastTotalDownBits) / refreshInterval;
speed["up"] = (totalUpBits - this._lastTotalUpBits) / refreshInterval;
this._lastTotalDownBytes = totalDownBytes;
this._lastTotalDownBits = totalDownBits;
this._lastTotalUpBytes = totalUpBytes;
this._lastTotalUpBits = totalUpBits;
} catch (e) {
console.error(e);
}
return speed;
}
}