mrmBot-Matrix/utils/image.js

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const magick = require("../build/Release/image.node");
const { Worker, isMainThread, parentPort, workerData } = require("worker_threads");
const fetch = require("node-fetch");
const { promisify } = require("util");
const AbortController = require("abort-controller");
const net = require("net");
const dgram = require("dgram");
const fileType = require("file-type");
const execPromise = promisify(require("child_process").exec);
const servers = require("../servers.json").image;
const formats = ["image/jpeg", "image/png", "image/webp", "image/gif"];
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const chooseServer = async (ideal) => {
if (ideal.length === 0) throw "No available servers";
const sorted = ideal.sort((a, b) => {
return a.load - b.load;
});
return sorted[0];
};
const getIdeal = () => {
return new Promise((resolve, reject) => {
const socket = dgram.createSocket("udp4");
let serversLeft = servers.length;
const idealServers = [];
const timeout = setTimeout(() => {
socket.close(async () => {
try {
const server = await chooseServer(idealServers);
resolve(server);
} catch (e) {
reject(e);
}
});
}, 5000);
socket.on("message", async (msg, rinfo) => {
const opcode = msg.readUint8(0);
const res = parseInt(msg.slice(1, msg.length).toString());
if (opcode === 0x3) {
serversLeft--;
idealServers.push({
addr: rinfo.address,
load: res
});
if (!serversLeft) {
clearTimeout(timeout);
socket.close(async () => {
try {
const server = await chooseServer(idealServers);
resolve(server);
} catch (e) {
reject(e);
}
});
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}
}
});
for (const server of servers) {
socket.send(Buffer.from([0x2]), 8080, server, (err) => {
if (err) reject(err);
});
}
});
};
const getFormat = (buffer, delimiter) => {
for (var i = 0; i < buffer.length ; i++) {
if (String.fromCharCode(buffer[i]) === delimiter) {
return {
buffer: buffer.slice(0, i),
dataStart: i
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};
}
}
};
exports.check = (cmd) => {
return magick[cmd] ? true : false;
};
exports.getType = async (image) => {
if (!image.startsWith("http")) {
const imageType = await fileType.fromFile(image);
if (imageType && formats.includes(imageType.mime)) {
return imageType.mime;
}
return undefined;
}
let type;
const controller = new AbortController();
const timeout = setTimeout(() => {
controller.abort();
}, 25000);
try {
const imageRequest = await fetch(image, { signal: controller.signal, highWaterMark: 512 });
const imageBuffer = await imageRequest.buffer();
const imageType = await fileType.fromBuffer(imageBuffer);
if (imageType && formats.includes(imageType.mime)) {
type = imageType.mime;
}
} catch (error) {
if (error.name === "AbortError") {
throw Error("Timed out");
} else {
throw error;
}
} finally {
clearTimeout(timeout);
}
return type;
};
exports.run = (object, fromAPI = false) => {
return new Promise(async (resolve, reject) => {
if (process.env.API === "true" && !fromAPI) {
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const currentServer = await getIdeal();
const socket = dgram.createSocket("udp4");
const data = Buffer.concat([Buffer.from([0x1]), Buffer.from(JSON.stringify(object))]);
const timeout = setTimeout(() => {
reject("Timed out");
}, 25000);
let jobID;
socket.on("message", (msg) => {
const opcode = msg.readUint8(0);
const req = msg.slice(37, msg.length);
const uuid = msg.slice(1, 36).toString();
if (opcode === 0x0) {
clearTimeout(timeout);
jobID = uuid;
} else if (opcode === 0x1) {
if (jobID === uuid) {
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const client = net.createConnection(req.toString(), currentServer.addr);
const array = [];
client.on("data", (rawData) => {
array.push(rawData);
});
client.once("end", () => {
const data = Buffer.concat(array);
const format = getFormat(data, "\n");
const payload = {
buffer: data.slice(format.dataStart + 1),
type: format.buffer.toString().split("/")[1]
};
socket.close();
resolve(payload);
});
client.on("error", (err) => {
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reject(err);
});
}
} else if (opcode === 0x2) {
if (jobID === uuid) reject(req);
}
});
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socket.send(data, 8080, currentServer.addr, (err) => {
if (err) reject(err);
});
} else if (isMainThread && !fromAPI) {
const worker = new Worker(__filename, {
workerData: object
});
worker.on("message", (data) => {
resolve({
buffer: Buffer.from([...data.buffer]),
type: data.type
});
});
worker.on("error", reject);
} else {
let type;
if (!fromAPI && object.path) {
const newType = (object.type ? object.type : await this.getType(object.path));
type = newType ? newType.split("/")[1] : "png";
if (type !== "gif" && object.onlyGIF) resolve({
buffer: "nogif",
type: null
});
object.type = type;
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", "");
object.delay = (100 / delay.split("/")[0]) * delay.split("/")[1];
}
const data = await promisify(magick[object.cmd])(object);
const returnObject = fromAPI ? data : {
buffer: data,
type: type
};
if (!isMainThread && !fromAPI) {
parentPort.postMessage(returnObject);
process.exit();
} else {
resolve(returnObject);
}
}
});
};
if (!isMainThread && process.env.API !== "true") this.run(workerData);