100 lines
2.6 KiB
JavaScript
100 lines
2.6 KiB
JavaScript
/* Desktop-only Web Serial shim.
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In the Electron app, the main process owns the serial port (via the
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`serialport` package) and streams bytes over IPC. This file re-exposes
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that transport through the same navigator.serial API the OBI web code
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uses, so js/common.js and js/interfaces/arduino_obi.js run unchanged. */
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(function () {
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"use strict";
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if (!window.serialAPI) return;
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const api = window.serialAPI;
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class DesktopSerialPort {
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constructor(info) {
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this._info = info;
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this._open = false;
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this._stream = null;
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this._controller = null;
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this._queue = [];
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this._unsubscribe = null;
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}
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getInfo() {
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return {
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usbVendorId: this._info.vendorId || 0,
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usbProductId: this._info.productId || 0,
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};
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}
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isOpen() {
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return this._open;
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}
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async open(options) {
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if (this._open) return;
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await api.open(this._info, (options && options.baudRate) || 9600);
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this._open = true;
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this._unsubscribe = api.onData((portPath, buf) => {
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if (portPath !== this._info.path) return;
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const data = new Uint8Array(buf);
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if (this._controller) this._controller.enqueue(data);
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else this._queue.push(data);
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});
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}
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get readable() {
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if (!this._open) throw new Error('InvalidStateError: port not open');
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if (!this._stream) {
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this._stream = new ReadableStream({
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start: (controller) => {
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this._controller = controller;
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for (const chunk of this._queue) controller.enqueue(chunk);
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this._queue = [];
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},
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cancel: () => {
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this._controller = null;
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},
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});
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}
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return this._stream;
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}
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get writable() {
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if (!this._open) throw new Error('InvalidStateError: port not open');
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return new WritableStream({
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write: (chunk) =>
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api.write(
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this._info,
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chunk instanceof Uint8Array ? chunk : new Uint8Array(chunk)
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),
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});
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}
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async setSignals(signals) {
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await api.setSignals(this._info, !!(signals && signals.dataTerminalReady));
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}
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async close() {
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await api.close(this._info);
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if (this._unsubscribe) this._unsubscribe();
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this._unsubscribe = null;
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this._open = false;
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}
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async forget() {}
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}
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Object.defineProperty(navigator, 'serial', {
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configurable: true,
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enumerable: true,
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value: {
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getPorts: async () => [],
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requestPort: async () => {
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const info = await api.requestPort();
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return new DesktopSerialPort(info);
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},
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},
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});
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})();
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