mrmBot-Matrix/utils/image.js

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2023-03-15 14:09:09 +00:00
import { request } from "undici";
import fs from "fs";
import path from "path";
import { fileURLToPath } from "url";
import { Worker } from "worker_threads";
import { createRequire } from "module";
import { fileTypeFromBuffer, fileTypeFromFile } from "file-type";
import * as logger from "./logger.js";
import ImageConnection from "./imageConnection.js";
// only requiring this to work around an issue regarding worker threads
const nodeRequire = createRequire(import.meta.url);
if (!process.env.API_TYPE || process.env.API_TYPE === "none") {
nodeRequire(`../build/${process.env.DEBUG && process.env.DEBUG === "true" ? "Debug" : "Release"}/image.node`);
}
const formats = ["image/jpeg", "image/png", "image/webp", "image/gif", "video/mp4", "video/webm", "video/quicktime"];
export const connections = new Map();
export let servers = process.env.API_TYPE === "ws" ? JSON.parse(fs.readFileSync(new URL("../config/servers.json", import.meta.url), { encoding: "utf8" })).image : null;
export async function getType(image, extraReturnTypes) {
if (!image.startsWith("http")) {
const imageType = await fileTypeFromFile(image);
if (imageType && formats.includes(imageType.mime)) {
return imageType.mime;
}
return undefined;
}
let type;
const controller = new AbortController();
const timeout = setTimeout(() => {
controller.abort();
}, 3000);
try {
const imageRequest = await request(image, {
signal: controller.signal,
method: "HEAD"
});
clearTimeout(timeout);
const size = imageRequest.headers["content-range"] ? imageRequest.headers["content-range"].split("/")[1] : imageRequest.headers["content-length"];
if (parseInt(size) > 26214400 && extraReturnTypes) { // 25 MB
type = "large";
return type;
}
const typeHeader = imageRequest.headers["content-type"];
if (typeHeader) {
type = typeHeader;
} else {
const timeout = setTimeout(() => {
controller.abort();
}, 3000);
const bufRequest = await request(image, {
signal: controller.signal,
headers: {
range: "bytes=0-1023"
}
});
clearTimeout(timeout);
const imageBuffer = await bufRequest.body.arrayBuffer();
const imageType = await fileTypeFromBuffer(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;
}
function connect(server, auth) {
const connection = new ImageConnection(server, auth);
connections.set(server, connection);
}
function disconnect() {
for (const connection of connections.values()) {
connection.close();
}
connections.clear();
}
async function repopulate() {
const data = await fs.promises.readFile(new URL("../config/servers.json", import.meta.url), { encoding: "utf8" });
servers = JSON.parse(data).image;
}
export async function reloadImageConnections() {
disconnect();
await repopulate();
let amount = 0;
for (const server of servers) {
try {
connect(server.server, server.auth);
amount += 1;
} catch (e) {
logger.error(e);
}
}
return amount;
}
function chooseServer(ideal) {
if (ideal.length === 0) throw "No available servers";
const sorted = ideal.sort((a, b) => {
return a.load - b.load;
});
return sorted[0];
}
async function getIdeal(object) {
const idealServers = [];
for (const [address, connection] of connections) {
if (connection.conn.readyState !== 0 && connection.conn.readyState !== 1) {
continue;
}
if (object.params.type && !connection.formats[object.cmd]?.includes(object.params.type)) continue;
idealServers.push({
addr: address,
load: await connection.getCount()
});
}
const server = chooseServer(idealServers);
return connections.get(server.addr);
}
function waitForWorker(worker) {
return new Promise((resolve, reject) => {
worker.once("message", (data) => {
resolve({
buffer: Buffer.from([...data.buffer]),
type: data.fileExtension,
width: data.width,
height: data.height
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});
});
worker.once("error", reject);
});
}
export async function runImageJob(params) {
if (process.env.API_TYPE === "ws") {
for (let i = 0; i < 3; i++) {
const currentServer = await getIdeal(params);
try {
await currentServer.queue(BigInt(params.id), params);
await currentServer.wait(BigInt(params.id));
const output = await currentServer.getOutput(params.id);
return output;
} catch (e) {
if (i < 2 && e === "Request ended prematurely due to a closed connection") {
continue;
} else {
if (e === "No available servers" && i >= 2) throw "Request ended prematurely due to a closed connection";
throw e;
}
}
}
} else {
// Called from command (not using image API)
const worker = new Worker(path.join(path.dirname(fileURLToPath(import.meta.url)), "./image-runner.js"), {
workerData: params
});
return await waitForWorker(worker);
}
}