137 lines
No EOL
4.7 KiB
JavaScript
137 lines
No EOL
4.7 KiB
JavaScript
// code provided by tzlil
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const os = require("os");
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const { Worker, isMainThread, parentPort } = require("worker_threads");
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const magick = require("../utils/image.js");
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const execPromise = require("util").promisify(require("child_process").exec);
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const net = require("net");
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const dgram = require("dgram"); // for UDP servers
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const socket = dgram.createSocket("udp4"); // Our universal UDP socket, this might cause issues and we may have to use a seperate socket for each connection
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var start = process.hrtime();
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const log = (msg, thread) => {
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console.log(`[${process.hrtime(start)[1] / 1000000}${(thread)?`:${thread}`:""}]\t ${msg}`);
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};
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const jobs = {};
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// Should look like UUID : { addr : "someaddr", port: someport msg: "request" }
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const queue = [];
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// Array of UUIDs
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if (isMainThread) {
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const { v4: uuidv4 } = require("uuid");
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const MAX_WORKERS = process.env.WORKERS === "" ? parseInt(process.env.WORKERS) : os.cpus().length * 4; // Completely arbitrary, should usually be some multiple of your amount of cores
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let workingWorkers = 0;
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const acceptJob = (uuid) => {
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workingWorkers++;
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const worker = new Worker(__filename);
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queue.shift();
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worker.once("message", (uuid) => {
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// This means the worker is finished
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workingWorkers--;
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if (queue.length > 0) {
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acceptJob(queue[0]); // Get the next job UUID in queue and remove it from the original queue
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delete jobs[uuid];
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}
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});
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worker.on("error", err => console.error("worker error:", err));
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worker.on("exit", (code) => {
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if (code !== 0)
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console.error(`Worker stopped with exit code ${code}`);
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});
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worker.postMessage({
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uuid: uuid,
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msg: jobs[uuid].msg,
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addr: jobs[uuid].addr,
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port: jobs[uuid].port,
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threadNum: workingWorkers
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});
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};
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const server = dgram.createSocket("udp4"); //Create a UDP server for listening to requests, we dont need tcp
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server.on("message", (msg, rinfo) => {
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const opcode = msg.readUint8(0);
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const req = msg.toString().slice(1,msg.length);
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// 0x0 == Cancel job
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// 0x1 == Queue job
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if (opcode == 0x0) {
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queue.shift();
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delete jobs[req];
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} else if (opcode == 0x1) {
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const job = { addr: rinfo.address, port: rinfo.port, msg: req };
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const uuid = uuidv4();
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jobs[uuid] = job;
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queue.push(uuid);
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if (workingWorkers < MAX_WORKERS) {
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acceptJob(uuid);
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}
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const newBuffer = Buffer.concat([Buffer.from([0x0]), Buffer.from(uuid)]);
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socket.send(newBuffer, rinfo.port, rinfo.address);
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} else {
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log("Could not parse message");
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}
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});
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server.on("listening", () => {
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const address = server.address();
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log(`server listening ${address.address}:${address.port}`);
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});
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server.bind(8080); // ATTENTION: Always going to be bound to 0.0.0.0 !!!
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} else {
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parentPort.once("message", async (job) => {
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log(`${job.uuid} worker got: ${job.msg}`, job.threadNum);
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try {
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const object = JSON.parse(job.msg);
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let type;
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if (object.path) {
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type = object.type;
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if (!object.type) {
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type = await magick.getType(object.path);
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}
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if (!type) {
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throw new TypeError("Unknown image type");
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}
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object.type = type.split("/")[1];
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if (object.type !== "gif" && object.onlyGIF) throw new TypeError(`Expected a GIF, got ${object.type}`);
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object.delay = object.delay ? object.delay : 0;
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}
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if (object.type === "gif" && !object.delay) {
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const delay = (await execPromise(`ffprobe -v 0 -of csv=p=0 -select_streams v:0 -show_entries stream=r_frame_rate ${object.path}`)).stdout.replace("\n", "");
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object.delay = (100 / delay.split("/")[0]) * delay.split("/")[1];
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}
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const data = await magick.run(object, true);
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log(`${job.uuid} is done`, job.threadNum);
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const server = net.createServer(function(socket) {
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socket.write(Buffer.concat([Buffer.from(type ? type : "image/png"), Buffer.from("\n"), data]));
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socket.end();
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});
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server.listen(job.port, job.addr);
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// handle address in use errors
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server.on("error", (e) => {
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if (e.code === "EADDRINUSE") {
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console.log("Address in use, retrying...");
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setTimeout(() => {
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server.close();
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server.listen(job.port, job.addr);
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}, 500);
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}
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});
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socket.send(Buffer.concat([Buffer.from([0x1]), Buffer.from(job.port.toString())]), job.port, job.addr);
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parentPort.postMessage(job.uuid); //Inform main thread about this worker freeing up
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} catch (e) {
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socket.send(Buffer.concat([Buffer.from([0x2]), Buffer.from(e.toString())]), job.port, job.address);
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parentPort.postMessage(job.uuid);
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}
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});
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} |