273 lines
8.9 KiB
JavaScript
273 lines
8.9 KiB
JavaScript
const magick = require("../build/Release/image.node");
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const { Worker } = require("worker_threads");
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const fetch = require("node-fetch");
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const fs = require("fs");
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const net = require("net");
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const fileType = require("file-type");
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const path = require("path");
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const { EventEmitter } = require("events");
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const logger = require("./logger.js");
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const formats = ["image/jpeg", "image/png", "image/webp", "image/gif", "video/mp4", "video/webm", "video/mov"];
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const jobs = {};
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exports.connections = [];
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const statuses = {};
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exports.servers = JSON.parse(fs.readFileSync("./servers.json", { encoding: "utf8" })).image;
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const chooseServer = async (ideal) => {
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if (ideal.length === 0) throw "No available servers";
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const sorted = ideal.sort((a, b) => {
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return b.load - a.load;
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});
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return sorted[0];
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};
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exports.repopulate = async () => {
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const data = await fs.promises.readFile("./servers.json", { encoding: "utf8" });
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this.servers = JSON.parse(data).image;
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return;
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};
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exports.getStatus = () => {
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return new Promise((resolve, reject) => {
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let serversLeft = this.connections.length;
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const statuses = [];
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const timeout = setTimeout(() => {
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resolve(statuses);
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}, 5000);
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for (const connection of this.connections) {
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if (!connection.remoteAddress) continue;
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fetch(`http://${connection.remoteAddress}:8081/running`).then(statusRequest => statusRequest.json()).then((status) => {
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serversLeft--;
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statuses.push(status);
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if (!serversLeft) {
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clearTimeout(timeout);
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resolve(statuses);
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}
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return;
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}).catch(e => reject(e));
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}
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});
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};
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exports.connect = (server) => {
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return new Promise((resolve, reject) => {
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const connection = net.createConnection(8080, server);
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const timeout = setTimeout(() => {
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const connectionIndex = this.connections.indexOf(connection);
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if (connectionIndex < 0) delete this.connections[connectionIndex];
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reject(`Failed to connect to ${server}`);
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}, 5000);
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connection.once("connect", () => {
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clearTimeout(timeout);
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});
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connection.on("data", async (msg) => {
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const opcode = msg.readUint8(0);
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const req = msg.slice(37, msg.length);
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const uuid = msg.slice(1, 37).toString();
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if (opcode === 0x00) { // Job queued
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if (jobs[req]) {
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jobs[req].event.emit("uuid", uuid);
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}
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} else if (opcode === 0x01) { // Job completed successfully
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// the image API sends all job responses over the same socket; make sure this is ours
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if (jobs[uuid]) {
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const imageReq = await fetch(`http://${connection.remoteAddress}:8081/image?id=${uuid}`);
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const image = await imageReq.buffer();
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// The response data is given as the file extension/ImageMagick type of the image (e.g. "png"), followed
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// by a newline, followed by the image data.
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jobs[uuid].event.emit("image", image, imageReq.headers.get("ext"));
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}
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} else if (opcode === 0x02) { // Job errored
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if (jobs[uuid]) {
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jobs[uuid].event.emit("error", new Error(req));
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}
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} else if (opcode === 0x03) {
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// we use the uuid part here because queue info requests don't respond with one
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statuses[`${connection.remoteAddress}:${connection.remotePort}`] = parseInt(uuid);
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}
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});
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connection.on("error", (e) => {
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logger.error(e);
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});
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connection.once("close", () => {
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for (const uuid of Object.keys(jobs)) {
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if (jobs[uuid].addr === connection.remoteAddress) jobs[uuid].event.emit("error", new Error("Job ended prematurely due to a closed connection; please run your image job again"));
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}
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});
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this.connections.push(connection);
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resolve();
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});
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};
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exports.disconnect = async () => {
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for (const connection of this.connections) {
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connection.destroy();
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}
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for (const uuid of Object.keys(jobs)) {
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jobs[uuid].event.emit("error", "Job ended prematurely (not really an error; just run your image job again)");
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}
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this.connections = [];
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return;
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};
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const getIdeal = () => {
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return new Promise((resolve, reject) => {
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let serversLeft = this.connections.length;
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const idealServers = [];
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const timeout = setTimeout(async () => {
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try {
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const server = await chooseServer(idealServers);
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resolve(this.connections.find(val => val.remoteAddress === server.addr));
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} catch (e) {
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reject(e);
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}
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}, 5000);
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for (const connection of this.connections) {
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if (!connection.remoteAddress) continue;
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fetch(`http://${connection.remoteAddress}:8081/status`).then(statusRequest => statusRequest.text()).then(async (status) => {
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serversLeft--;
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idealServers.push({
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addr: connection.remoteAddress,
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load: parseInt(status)
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});
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if (!serversLeft) {
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clearTimeout(timeout);
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const server = await chooseServer(idealServers);
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resolve(this.connections.find(val => val.remoteAddress === server.addr));
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}
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return;
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}).catch(e => reject(e));
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}
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});
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};
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const start = (object, num) => {
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return getIdeal().then(async (currentServer) => {
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const data = Buffer.concat([Buffer.from([0x01 /* queue job */]), Buffer.from(num.length.toString()), Buffer.from(num), Buffer.from(JSON.stringify(object))]);
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return new Promise((resolve, reject) => {
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currentServer.write(data, (err) => {
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if (err) {
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if (err.code === "EPIPE") {
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logger.log(`Lost connection to ${currentServer.remoteAddress}, attempting to reconnect...`);
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currentServer.connect(8080, currentServer.remoteAddress, () => {
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const res = start(object, num);
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reject(res); // this is done to differentiate the result from a step
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});
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} else {
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reject(err);
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}
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} else {
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resolve(currentServer.remoteAddress);
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}
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});
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});
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}).then((addr) => {
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const event = new EventEmitter();
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return new Promise((resolve) => {
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event.once("uuid", (uuid) => resolve({ event, uuid, addr }));
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jobs[num] = { event, addr };
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});
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}, (result) => {
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throw result;
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}).then(data => {
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delete jobs[num];
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jobs[data.uuid] = { event: data.event, addr: data.addr };
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return { uuid: data.uuid, event: data.event };
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});
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};
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exports.check = (cmd) => {
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return magick[cmd] ? true : false;
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};
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exports.getType = async (image) => {
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if (!image.startsWith("http")) {
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const imageType = await fileType.fromFile(image);
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if (imageType && formats.includes(imageType.mime)) {
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return imageType.mime;
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}
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return undefined;
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}
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let type;
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const controller = new AbortController(); // eslint-disable-line no-undef
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const timeout = setTimeout(() => {
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controller.abort();
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}, 25000);
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try {
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const imageRequest = await fetch(image, { signal: controller.signal, headers: {
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"Range": "bytes=0-1023"
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}});
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clearTimeout(timeout);
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if (parseInt(imageRequest.headers.get("Content-Range").split("/")[1]) > 20971520) {
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type = "large";
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return type;
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}
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const imageBuffer = await imageRequest.buffer();
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const imageType = await fileType.fromBuffer(imageBuffer);
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if (imageType && formats.includes(imageType.mime)) {
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type = imageType.mime;
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}
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} catch (error) {
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if (error.name === "AbortError") {
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throw Error("Timed out");
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} else {
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throw error;
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}
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} finally {
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clearTimeout(timeout);
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}
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return type;
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};
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exports.run = object => {
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return new Promise((resolve, reject) => {
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if (process.env.API === "true") {
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// Connect to best image server
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const num = Math.floor(Math.random() * 100000).toString().slice(0, 5);
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const timeout = setTimeout(() => {
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if (jobs[num]) delete jobs[num];
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reject("the image request timed out after 25 seconds. Try uploading your image elsewhere.");
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}, 25000);
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start(object, num).catch(err => { // incredibly hacky code incoming
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clearTimeout(timeout);
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if (err instanceof Error) return reject(err);
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return err;
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}).then((data) => {
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clearTimeout(timeout);
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if (!data.event) reject("Not connected to image server");
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data.event.once("image", (image, type) => {
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delete jobs[data.uuid];
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const payload = {
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// Take just the image data
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buffer: image,
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type: type
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};
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resolve(payload);
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});
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data.event.once("error", (err) => {
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reject(err);
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});
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return;
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}).catch(err => reject(err));
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} else {
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// Called from command (not using image API)
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const worker = new Worker(path.join(__dirname, "image-runner.js"), {
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workerData: object
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});
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worker.once("message", (data) => {
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resolve({
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buffer: Buffer.from([...data.buffer]),
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type: data.fileExtension
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});
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});
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worker.once("error", reject);
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}
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});
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};
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