| 1 | export class WebSocketTransport { |
| 2 | constructor(options = {}) { |
| 3 | this._ws = null; |
| 4 | this._reconnectTimer = null; |
| 5 | this._reconnectDelay = 1000; |
| 6 | this._closed = false; |
| 7 | this._buffer = []; |
| 8 | this.url = options.url ?? null; |
| 9 | this.reconnect = options.reconnect !== false; |
| 10 | this.maxReconnectDelay = options.maxReconnectDelay ?? 30000; |
| 11 | this.onData = options.onData ?? null; |
| 12 | this.onOpen = options.onOpen ?? null; |
| 13 | this.onClose = options.onClose ?? null; |
| 14 | this.onError = options.onError ?? null; |
| 15 | } |
| 16 | connect(url) { |
| 17 | if (url) |
| 18 | this.url = url; |
| 19 | if (!this.url) |
| 20 | throw new Error("No WebSocket URL provided"); |
| 21 | this._closed = false; |
| 22 | this._ws = new WebSocket(this.url); |
| 23 | this._ws.binaryType = "arraybuffer"; |
| 24 | this._ws.onopen = () => { |
| 25 | this._reconnectDelay = 1000; |
| 26 | this._flushBuffer(); |
| 27 | if (this.onOpen) |
| 28 | this.onOpen(); |
| 29 | }; |
| 30 | this._ws.onmessage = (event) => { |
| 31 | if (this.onData) { |
| 32 | if (event.data instanceof ArrayBuffer) { |
| 33 | this.onData(new Uint8Array(event.data)); |
| 34 | } |
| 35 | else { |
| 36 | this.onData(event.data); |
| 37 | } |
| 38 | } |
| 39 | }; |
| 40 | this._ws.onclose = () => { |
| 41 | if (this.onClose) |
| 42 | this.onClose(); |
| 43 | if (this.reconnect && !this._closed) |
| 44 | this._scheduleReconnect(); |
| 45 | }; |
| 46 | this._ws.onerror = (event) => { |
| 47 | if (this.onError) |
| 48 | this.onError(event); |
| 49 | this._ws?.close(); |
| 50 | }; |
| 51 | } |
| 52 | send(data) { |
| 53 | if (this._ws && this._ws.readyState === WebSocket.OPEN) { |
| 54 | if (typeof data === "string") { |
| 55 | this._ws.send(new TextEncoder().encode(data)); |
| 56 | } |
| 57 | else { |
| 58 | this._ws.send(data); |
| 59 | } |
| 60 | } |
| 61 | else { |
| 62 | this._buffer.push(data); |
| 63 | } |
| 64 | } |
| 65 | close() { |
| 66 | this._closed = true; |
| 67 | if (this._reconnectTimer) |
| 68 | clearTimeout(this._reconnectTimer); |
| 69 | if (this._ws) |
| 70 | this._ws.close(); |
| 71 | } |
| 72 | get connected() { |
| 73 | return this._ws !== null && this._ws.readyState === WebSocket.OPEN; |
| 74 | } |
| 75 | _flushBuffer() { |
| 76 | const items = this._buffer.splice(0); |
| 77 | for (const item of items) { |
| 78 | this.send(item); |
| 79 | } |
| 80 | } |
| 81 | _scheduleReconnect() { |
| 82 | this._reconnectTimer = setTimeout(() => { |
| 83 | this.connect(); |
| 84 | }, this._reconnectDelay); |
| 85 | this._reconnectDelay = Math.min(this._reconnectDelay * 2, this.maxReconnectDelay); |
| 86 | } |
| 87 | } |