mrmBot-Matrix/api/index.js

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// code originally provided by tzlil
require("dotenv").config();
const os = require("os");
const { run } = require("../utils/image-runner.js");
const net = require("net");
const http = require("http");
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const start = process.hrtime();
const log = (msg, jobNum) => {
console.log(`[${process.hrtime(start)[1] / 1000000}${jobNum !== undefined ? `:${jobNum}` : ""}]\t ${msg}`);
};
const jobs = {};
// Should look like UUID : { addr : "someaddr", port: someport msg: "request" }
const queue = [];
// Array of UUIDs
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const { v4: uuidv4 } = require("uuid");
const MAX_JOBS = process.env.JOBS !== "" && process.env.JOBS !== undefined ? parseInt(process.env.JOBS) : os.cpus().length * 4; // Completely arbitrary, should usually be some multiple of your amount of cores
let jobAmount = 0;
const acceptJob = async (uuid, sock) => {
jobAmount++;
queue.shift();
try {
await runJob({
uuid: uuid,
msg: jobs[uuid].msg,
num: jobs[uuid].num
}, sock);
jobAmount--;
if (queue.length > 0) {
acceptJob(queue[0]);
}
log(`Job ${uuid} has finished`);
} catch (err) {
console.error(`Error on job ${uuid}:`, err);
jobAmount--;
if (queue.length > 0) {
acceptJob(queue[0]);
}
delete jobs[uuid];
sock.write(Buffer.concat([Buffer.from([0x2]), Buffer.from(uuid), Buffer.from(err.toString())]));
}
};
const httpServer = http.createServer((req, res) => {
if (req.method !== "GET") {
res.statusCode = 405;
return res.end("405 Method Not Allowed");
}
const reqUrl = new URL(req.url, `http://${req.headers.host}`);
if (reqUrl.pathname === "/status") {
log(`Sending server status to ${req.socket.remoteAddress}:${req.socket.remotePort} via HTTP`);
return res.end(Buffer.from((MAX_JOBS - jobAmount).toString()));
} else if (reqUrl.pathname === "/image") {
if (!reqUrl.searchParams.has("id")) {
res.statusCode = 400;
return res.end("400 Bad Request");
}
const id = reqUrl.searchParams.get("id");
if (!jobs[id]) {
res.statusCode = 410;
return res.end("410 Gone");
}
log(`Sending image data for job ${id} to ${req.socket.remoteAddress}:${req.socket.remotePort} via HTTP`);
res.setHeader("ext", jobs[id].ext);
return res.end(jobs[id].data, (err) => {
if (err) console.error(err);
delete jobs[id];
});
} else {
res.statusCode = 404;
return res.end("404 Not Found");
}
});
httpServer.on("error", (e) => {
console.error("An HTTP error occurred: ", e);
});
httpServer.listen(8081, () => {
log("HTTP listening on port 8081");
});
const server = net.createServer((sock) => { // Create a TCP socket/server to listen to requests
log(`TCP client ${sock.remoteAddress}:${sock.remotePort} has connected`);
sock.on("error", (e) => {
console.error(e);
});
sock.on("data", (msg) => {
const opcode = msg.readUint8(0);
const req = msg.toString().slice(1,msg.length);
console.log(req);
// 0x00 == Cancel job
// 0x01 == Queue job
if (opcode == 0x00) {
delete queue[queue.indexOf(req) - 1];
delete jobs[req];
} else if (opcode == 0x01) {
const length = parseInt(req.slice(0, 1));
const num = req.slice(1, length + 1);
const obj = req.slice(length + 1);
const job = { addr: sock.remoteAddress, port: sock.remotePort, msg: obj, num: jobAmount };
const uuid = uuidv4();
jobs[uuid] = job;
queue.push(uuid);
const newBuffer = Buffer.concat([Buffer.from([0x00]), Buffer.from(uuid), Buffer.from(num)]);
sock.write(newBuffer);
if (jobAmount < MAX_JOBS) {
log(`Got TCP request for job ${job.msg} with id ${uuid}`, job.num);
acceptJob(uuid, sock);
} else {
log(`Got TCP request for job ${job.msg} with id ${uuid}, queued in position ${queue.indexOf(uuid)}`, job.num);
}
} else {
log("Could not parse TCP message");
}
});
sock.on("end", () => {
log(`TCP client ${sock.remoteAddress}:${sock.remotePort} has disconnected`);
});
});
server.on("error", (e) => {
console.error("A TCP error occurred: ", e);
});
server.listen(8080, () => {
log("TCP listening on port 8080");
});
const runJob = (job, sock) => {
return new Promise(async (resolve, reject) => {
log(`Job ${job.uuid} starting...`, job.num);
const object = JSON.parse(job.msg);
// If the image has a path, it must also have a type
if (object.path && !object.type) {
reject(new TypeError("Unknown image type"));
}
log(`Job ${job.uuid} started`, job.num);
try {
const { buffer, fileExtension } = await run(object);
log(`Sending result of job ${job.uuid} back to the bot`, job.num);
jobs[job.uuid].data = buffer;
jobs[job.uuid].ext = fileExtension;
sock.write(Buffer.concat([Buffer.from([0x1]), Buffer.from(job.uuid)]), (e) => {
if (e) return reject(e);
return resolve();
});
} catch (e) {
reject(e);
}
});
};