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Initial commit of WebOS receiver

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This commit is contained in:
Michael Hollister 2024-12-09 00:56:55 -06:00
parent b7e304b987
commit 90e1f4de1a
118 changed files with 18279 additions and 1746 deletions
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208
receivers/common/web/FCastSession.ts Normal file
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import * as net from 'net';
import * as log4js from "modules/log4js";
import { EventEmitter } from 'node:events';
import { PlaybackErrorMessage, PlaybackUpdateMessage, PlayMessage, SeekMessage, SetSpeedMessage, SetVolumeMessage, VersionMessage, VolumeUpdateMessage } from 'common/Packets';
import { WebSocket } from 'modules/ws';
const logger = log4js.getLogger();
enum SessionState {
Idle = 0,
WaitingForLength,
WaitingForData,
Disconnected,
};
export enum Opcode {
None = 0,
Play = 1,
Pause = 2,
Resume = 3,
Stop = 4,
Seek = 5,
PlaybackUpdate = 6,
VolumeUpdate = 7,
SetVolume = 8,
PlaybackError = 9,
SetSpeed = 10,
Version = 11,
Ping = 12,
Pong = 13
};
const LENGTH_BYTES = 4;
const MAXIMUM_PACKET_LENGTH = 32000;
export class FCastSession {
buffer: Buffer = Buffer.alloc(MAXIMUM_PACKET_LENGTH);
bytesRead = 0;
packetLength = 0;
socket: net.Socket | WebSocket;
writer: (data: Buffer) => void;
state: SessionState;
emitter = new EventEmitter();
constructor(socket: net.Socket | WebSocket, writer: (data: Buffer) => void) {
this.socket = socket;
this.writer = writer;
this.state = SessionState.WaitingForLength;
}
send(opcode: number, message = null) {
const json = message ? JSON.stringify(message) : null;
logger.info(`send (opcode: ${opcode}, body: ${json})`);
let data: Uint8Array;
if (json) {
const utf8Encode = new TextEncoder();
data = utf8Encode.encode(json);
} else {
data = new Uint8Array(0);
}
const size = 1 + data.length;
const header = Buffer.alloc(4 + 1);
header.writeUint32LE(size, 0);
header[4] = opcode;
let packet: Buffer;
if (data.length > 0) {
packet = Buffer.concat([ header, data ]);
} else {
packet = header;
}
this.writer(packet);
}
close() {
if (this.socket instanceof WebSocket) {
this.socket.close();
} else if (this.socket instanceof net.Socket) {
this.socket.end();
}
}
processBytes(receivedBytes: Buffer) {
//TODO: Multithreading?
if (receivedBytes.length == 0) {
return;
}
logger.info(`${receivedBytes.length} bytes received`);
switch (this.state) {
case SessionState.WaitingForLength:
this.handleLengthBytes(receivedBytes);
break;
case SessionState.WaitingForData:
this.handlePacketBytes(receivedBytes);
break;
default:
logger.info(`Data received is unhandled in current session state ${this.state}.`);
break;
}
}
private handleLengthBytes(receivedBytes: Buffer) {
const bytesToRead = Math.min(LENGTH_BYTES, receivedBytes.length);
const bytesRemaining = receivedBytes.length - bytesToRead;
receivedBytes.copy(this.buffer, this.bytesRead, 0, bytesToRead);
this.bytesRead += bytesToRead;
logger.info(`handleLengthBytes: Read ${bytesToRead} bytes from packet`);
if (this.bytesRead >= LENGTH_BYTES) {
this.state = SessionState.WaitingForData;
this.packetLength = this.buffer.readUInt32LE(0);
this.bytesRead = 0;
logger.info(`Packet length header received from: ${this.packetLength}`);
if (this.packetLength > MAXIMUM_PACKET_LENGTH) {
throw new Error(`Maximum packet length is 32kB: ${this.packetLength}`);
}
if (bytesRemaining > 0) {
logger.info(`${bytesRemaining} remaining bytes pushed to handlePacketBytes`);
this.handlePacketBytes(receivedBytes.slice(bytesToRead));
}
}
}
private handlePacketBytes(receivedBytes: Buffer) {
const bytesToRead = Math.min(this.packetLength, receivedBytes.length);
const bytesRemaining = receivedBytes.length - bytesToRead;
receivedBytes.copy(this.buffer, this.bytesRead, 0, bytesToRead);
this.bytesRead += bytesToRead;
logger.info(`handlePacketBytes: Read ${bytesToRead} bytes from packet`);
if (this.bytesRead >= this.packetLength) {
logger.info(`Packet finished receiving from of ${this.packetLength} bytes.`);
this.handleNextPacket();
this.state = SessionState.WaitingForLength;
this.packetLength = 0;
this.bytesRead = 0;
if (bytesRemaining > 0) {
logger.info(`${bytesRemaining} remaining bytes pushed to handleLengthBytes`);
this.handleLengthBytes(receivedBytes.slice(bytesToRead));
}
}
}
private handlePacket(opcode: number, body: string | undefined) {
logger.info(`handlePacket (opcode: ${opcode}, body: ${body})`);
try {
switch (opcode) {
case Opcode.Play:
this.emitter.emit("play", JSON.parse(body) as PlayMessage);
break;
case Opcode.Pause:
this.emitter.emit("pause");
break;
case Opcode.Resume:
this.emitter.emit("resume");
break;
case Opcode.Stop:
this.emitter.emit("stop");
break;
case Opcode.Seek:
this.emitter.emit("seek", JSON.parse(body) as SeekMessage);
break;
case Opcode.SetVolume:
this.emitter.emit("setvolume", JSON.parse(body) as SetVolumeMessage);
break;
case Opcode.SetSpeed:
this.emitter.emit("setspeed", JSON.parse(body) as SetSpeedMessage);
break;
case Opcode.Ping:
this.send(Opcode.Pong);
break;
}
} catch (e) {
logger.warn(`Error handling packet from.`, e);
}
}
private handleNextPacket() {
logger.info(`Processing packet of ${this.bytesRead} bytes from`);
const opcode = this.buffer[0];
const body = this.packetLength > 1 ? this.buffer.toString('utf8', 1, this.packetLength) : null;
logger.info('body', body);
this.handlePacket(opcode, body);
}
bindEvents(emitter: EventEmitter) {
this.emitter.on("play", (body: PlayMessage) => { emitter.emit("play", body) });
this.emitter.on("pause", () => { emitter.emit("pause") });
this.emitter.on("resume", () => { emitter.emit("resume") });
this.emitter.on("stop", () => { emitter.emit("stop") });
this.emitter.on("seek", (body: SeekMessage) => { emitter.emit("seek", body) });
this.emitter.on("setvolume", (body: SetVolumeMessage) => { emitter.emit("setvolume", body) });
this.emitter.on("setspeed", (body: SetSpeedMessage) => { emitter.emit("setspeed", body) });
}
}