171 lines
4.2 KiB
JavaScript
171 lines
4.2 KiB
JavaScript
import { request } from "undici";
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import WebSocket from "ws";
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import * as logger from "./logger.js";
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import { setTimeout } from "timers/promises";
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const Rerror = 0x01;
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const Tqueue = 0x02;
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const Rqueue = 0x03;
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const Tcancel = 0x04;
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const Rcancel = 0x05;
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const Twait = 0x06;
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const Rwait = 0x07;
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const Rinit = 0x08;
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class ImageConnection {
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constructor(host, auth, tls = false) {
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this.requests = new Map();
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if (!host.includes(":")) {
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host += ":3762";
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}
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this.host = host;
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this.auth = auth;
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this.tag = 0;
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this.disconnected = false;
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this.formats = {};
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this.wsproto = null;
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if (tls) {
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this.wsproto = "wss";
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} else {
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this.wsproto = "ws";
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}
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this.sockurl = `${this.wsproto}://${host}/sock`;
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const headers = {};
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if (auth) {
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headers.Authentication = auth;
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}
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this.conn = new WebSocket(this.sockurl, { headers });
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let httpproto;
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if (tls) {
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httpproto = "https";
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} else {
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httpproto = "http";
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}
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this.httpurl = `${httpproto}://${host}`;
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this.conn.on("message", (msg) => this.onMessage(msg));
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this.conn.once("error", (err) => this.onError(err));
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this.conn.once("close", () => this.onClose());
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}
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async onMessage(msg) {
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const op = msg.readUint8(0);
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if (op === Rinit) {
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this.formats = JSON.parse(msg.toString("utf8", 7));
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return;
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}
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const tag = msg.readUint16LE(1);
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const promise = this.requests.get(tag);
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if (!promise) {
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logger.error(`Received response for unknown request ${tag}`);
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return;
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}
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this.requests.delete(tag);
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if (op === Rerror) {
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promise.reject(new Error(msg.slice(3, msg.length).toString()));
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return;
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}
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promise.resolve();
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}
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onError(e) {
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logger.error(e.toString());
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}
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async onClose() {
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for (const [tag, obj] of this.requests.entries()) {
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obj.reject("Request ended prematurely due to a closed connection");
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this.requests.delete(tag);
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}
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if (!this.disconnected) {
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logger.warn(`Lost connection to ${this.host}, attempting to reconnect in 5 seconds...`);
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await setTimeout(5000);
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this.conn = new WebSocket(this.sockurl, {
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headers: {
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"Authentication": this.auth
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}
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});
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this.conn.on("message", (msg) => this.onMessage(msg));
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this.conn.once("error", (err) => this.onError(err));
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this.conn.once("close", () => this.onClose());
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}
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this.disconnected = false;
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}
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close() {
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this.disconnected = true;
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this.conn.close();
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}
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queue(jobid, jobobj) {
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const str = JSON.stringify(jobobj);
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const buf = Buffer.alloc(8);
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buf.writeBigUint64LE(jobid);
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return this.do(Tqueue, jobid, Buffer.concat([buf, Buffer.from(str)]));
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}
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wait(jobid) {
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const buf = Buffer.alloc(8);
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buf.writeBigUint64LE(jobid);
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return this.do(Twait, jobid, buf);
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}
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cancel(jobid) {
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const buf = Buffer.alloc(8);
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buf.writeBigUint64LE(jobid);
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return this.do(Tcancel, jobid, buf);
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}
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async getOutput(jobid) {
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const req = await request(`${this.httpurl}/image?id=${jobid}`, {
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headers: {
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authentication: this.auth || undefined
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}
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});
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const contentType = req.headers["content-type"];
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let type;
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switch (contentType) {
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case "image/gif":
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type = "gif";
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break;
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case "image/png":
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type = "png";
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break;
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case "image/jpeg":
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type = "jpg";
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break;
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case "image/webp":
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type = "webp";
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break;
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default:
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type = contentType;
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break;
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}
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return { arrayBuffer: await req.body.arrayBuffer(), type };
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}
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async getCount() {
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const req = await request(`${this.httpurl}/count`, {
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headers: {
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authentication: this.auth || undefined
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}
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});
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if (req.statusCode !== 200) return;
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const res = parseInt(await req.body.text());
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return res;
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}
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async do(op, id, data) {
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const buf = Buffer.alloc(1 + 2);
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let tag = this.tag++;
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if (tag > 65535) tag = this.tag = 0;
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buf.writeUint8(op);
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buf.writeUint16LE(tag, 1);
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this.conn.send(Buffer.concat([buf, data]));
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const promise = new Promise((resolve, reject) => {
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this.requests.set(tag, { resolve, reject, id, op });
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});
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return promise;
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}
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}
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export default ImageConnection;
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