Giant refactoring (or at least the start)

In short:
- cvmts is now bundled/built via parcel and inside of a npm/yarn workspace with multiple nodejs projects
- cvmts now uses the crusttest QEMU management and RFB library (or a fork, if you so prefer).
- cvmts does NOT use node-canvas anymore, instead we opt for the same route crusttest took and just encode jpegs ourselves from the RFB provoded framebuffer via jpeg-turbo. this means funnily enough sharp is back for more for thumbnails, but actually seems to WORK this time
- IPData is now managed in a very similar way to the original cvm 1.2 implementation where a central manager and reference count exist. tbh it wouldn't be that hard to implement multinode either, but for now, I'm not going to take much time on doing that.

this refactor is still incomplete. please do not treat it as generally available while it's not on the default branch. if you want to use it (and report bugs or send fixes) feel free to, but while it may "just work" in certain situations it may be very broken in others.

(yes, I know windows support is partially totaled by this; it's something that can and will be fixed)

qemu/src/QemuDisplay.ts

@@ -0,0 +1,143 @@
+import { VncClient } from '@computernewb/nodejs-rfb';
+import { EventEmitter } from 'node:events';
+import { BatchRects } from './QemuUtil.js';
+import { Size, Rect, Clamp } from '@cvmts/shared';
+
+const kQemuFps = 60;
+
+export type VncRect = {
+	x: number;
+	y: number;
+	width: number;
+	height: number;
+};
+
+// events:
+//
+// 'resize' -> (w, h) -> done when resize occurs
+// 'rect' -> (x, y, ImageData) -> framebuffer
+// 'frame' -> () -> done at end of frame
+
+export class QemuDisplay extends EventEmitter {
+	private displayVnc = new VncClient({
+		debug: false,
+		fps: kQemuFps,
+
+		encodings: [
+			VncClient.consts.encodings.raw,
+
+			//VncClient.consts.encodings.pseudoQemuAudio,
+			VncClient.consts.encodings.pseudoDesktopSize
+			// For now?
+			//VncClient.consts.encodings.pseudoCursor
+		]
+	});
+
+	private vncShouldReconnect: boolean = false;
+	private vncSocketPath: string;
+
+	constructor(socketPath: string) {
+		super();
+
+		this.vncSocketPath = socketPath;
+
+		this.displayVnc.on('connectTimeout', () => {
+			this.Reconnect();
+		});
+
+		this.displayVnc.on('authError', () => {
+			this.Reconnect();
+		});
+
+		this.displayVnc.on('disconnect', () => {
+			this.Reconnect();
+		});
+
+		this.displayVnc.on('closed', () => {
+			this.Reconnect();
+		});
+
+		this.displayVnc.on('firstFrameUpdate', () => {
+			// apparently this library is this good.
+			// at least it's better than the two others which exist.
+			this.displayVnc.changeFps(kQemuFps);
+			this.emit('connected');
+
+			this.emit('resize', { width: this.displayVnc.clientWidth, height: this.displayVnc.clientHeight });
+			//this.emit('rect', { x: 0, y: 0, width: this.displayVnc.clientWidth, height: this.displayVnc.clientHeight });
+			this.emit('frame');
+		});
+
+		this.displayVnc.on('desktopSizeChanged', (size: Size) => {
+			this.emit('resize', size);
+		});
+
+		let rects: Rect[] = [];
+
+		this.displayVnc.on('rectUpdateProcessed', (rect: Rect) => {
+			rects.push(rect);
+		});
+
+		this.displayVnc.on('frameUpdated', (fb: Buffer) => {
+			// use the cvmts batcher
+			let batched = BatchRects(this.Size(), rects);
+			this.emit('rect', batched);
+
+			// unbatched (watch the performace go now)
+			//for(let rect of rects)
+			//	this.emit('rect', rect);
+
+			rects = [];
+
+			this.emit('frame');
+		});
+	}
+
+	private Reconnect() {
+		if (this.displayVnc.connected) return;
+
+		if (!this.vncShouldReconnect) return;
+
+		// TODO: this should also give up after a max tries count
+		// if we fail after max tries, emit a event
+
+		this.displayVnc.connect({
+			path: this.vncSocketPath
+		});
+	}
+
+	Connect() {
+		this.vncShouldReconnect = true;
+		this.Reconnect();
+	}
+
+	Disconnect() {
+		this.vncShouldReconnect = false;
+		this.displayVnc.disconnect();
+	}
+
+	Buffer(): Buffer {
+		return this.displayVnc.fb;
+	}
+
+	Size(): Size {
+		if (!this.displayVnc.connected)
+			return {
+				width: 0,
+				height: 0
+			};
+
+		return {
+			width: this.displayVnc.clientWidth,
+			height: this.displayVnc.clientHeight
+		};
+	}
+
+	MouseEvent(x: number, y: number, buttons: number) {
+		if (this.displayVnc.connected) this.displayVnc.sendPointerEvent(Clamp(x, 0, this.displayVnc.clientWidth), Clamp(y, 0, this.displayVnc.clientHeight), buttons);
+	}
+
+	KeyboardEvent(keysym: number, pressed: boolean) {
+		if (this.displayVnc.connected) this.displayVnc.sendKeyEvent(keysym, pressed);
+	}
+}