Switched to an image API implementation by Terradice
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6 changed files with 209 additions and 165 deletions
212
api/index.js
212
api/index.js
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@ -1,98 +1,136 @@
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require("dotenv").config();
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// code provided by terradice/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 Job = require("./job.js");
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const { version } = require("../package.json");
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const express = require("express");
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const execPromise = require("util").promisify(require("child_process").exec);
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const app = express();
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const port = 3000;
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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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const jobs = new Map();
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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 ${msg}`);
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};
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app.get("/", (req, res) => {
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res.send(`esmBot v${version}`);
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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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app.post("/run", express.json(), async (req, res, next) => {
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const object = req.body;
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if (!magick.check(object.cmd)) return res.sendStatus(400);
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if (isMainThread) {
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const { v4: uuidv4 } = require("uuid");
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try {
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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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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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if (!type) {
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return res.sendStatus(400);
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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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object.type = type.split("/")[1];
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if (object.type !== "gif" && object.onlyGIF) return res.send({
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status: "nogif"
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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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});
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object.delay = object.delay ? object.delay : 0;
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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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const id = Math.random().toString(36).substring(2, 15);
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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 job = new Job(object);
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jobs.set(id, job);
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res.send({
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id: id,
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status: "queued"
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});
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job.run();
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} catch (e) {
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next(e);
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}
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});
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app.get("/status", (req, res) => {
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if (!req.query.id) return res.sendStatus(400);
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const job = jobs.get(req.query.id);
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if (!job) return res.sendStatus(400);
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const timeout = setTimeout(function() {
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job.removeAllListeners();
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return res.send({
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id: req.query.id,
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status: job.status
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});
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}, 10000);
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job.once("data", function() {
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clearTimeout(timeout);
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res.send({
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id: req.query.id,
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status: job.status
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});
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//jobs.delete(req.query.id);
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});
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job.on("error", function(e) {
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clearTimeout(timeout);
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res.status(500);
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res.send({
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id: req.query.id,
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status: job.status,
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error: e
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});
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jobs.delete(req.query.id);
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});
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});
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app.get("/image", (req, res) => {
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if (!req.query.id) return res.sendStatus(400);
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const job = jobs.get(req.query.id);
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if (!job) return res.sendStatus(400);
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if (!job.data) return res.sendStatus(400);
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if (job.error) return;
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jobs.delete(req.query.id);
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res.contentType(job.options.type ? job.options.type : "png");
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return res.send(job.data);
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});
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app.listen(port, () => {
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console.log(`Started image API on port ${port}.`);
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});
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}
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28
api/job.js
28
api/job.js
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@ -1,28 +0,0 @@
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const { EventEmitter } = require("events");
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const magick = require("../utils/image.js");
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class Job extends EventEmitter {
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constructor(options) {
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super();
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this.options = options;
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this.status = "queued";
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this.data = null;
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this.error = null;
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}
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run() {
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this.status = "processing";
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magick.run(this.options, true).then(data => {
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this.status = "success";
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this.data = data;
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return this.emit("data", data, this.options.type);
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}).catch(e => {
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this.status = "error";
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this.error = e;
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return this.emit("error", e);
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});
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return;
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}
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}
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module.exports = Job;
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