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Filename : uws.js
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"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.patchAdapter = patchAdapter;
exports.restoreAdapter = restoreAdapter;
exports.serveFile = serveFile;
const socket_io_adapter_1 = require("socket.io-adapter");
const fs_1 = require("fs");
const debug_1 = __importDefault(require("debug"));
const debug = (0, debug_1.default)("socket.io:adapter-uws");
const SEPARATOR = "\x1f"; // see https://en.wikipedia.org/wiki/Delimiter#ASCII_delimited_text
const { addAll, del, broadcast } = socket_io_adapter_1.Adapter.prototype;
function patchAdapter(app /* : TemplatedApp */) {
    socket_io_adapter_1.Adapter.prototype.addAll = function (id, rooms) {
        const isNew = !this.sids.has(id);
        addAll.call(this, id, rooms);
        const socket = this.nsp.sockets.get(id) || this.nsp._preConnectSockets.get(id);
        if (!socket) {
            return;
        }
        if (socket.conn.transport.name === "websocket") {
            subscribe(this.nsp.name, socket, isNew, rooms);
            return;
        }
        if (isNew) {
            socket.conn.on("upgrade", () => {
                const rooms = this.sids.get(id);
                if (rooms) {
                    subscribe(this.nsp.name, socket, isNew, rooms);
                }
            });
        }
    };
    socket_io_adapter_1.Adapter.prototype.del = function (id, room) {
        del.call(this, id, room);
        const socket = this.nsp.sockets.get(id) || this.nsp._preConnectSockets.get(id);
        if (socket && socket.conn.transport.name === "websocket") {
            // @ts-ignore
            const sessionId = socket.conn.id;
            // @ts-ignore
            const websocket = socket.conn.transport.socket;
            const topic = `${this.nsp.name}${SEPARATOR}${room}`;
            debug("unsubscribe connection %s from topic %s", sessionId, topic);
            websocket.unsubscribe(topic);
        }
    };
    socket_io_adapter_1.Adapter.prototype.broadcast = function (packet, opts) {
        const useFastPublish = opts.rooms.size <= 1 && opts.except.size === 0;
        if (!useFastPublish) {
            broadcast.call(this, packet, opts);
            return;
        }
        const flags = opts.flags || {};
        const basePacketOpts = {
            preEncoded: true,
            volatile: flags.volatile,
            compress: flags.compress,
        };
        packet.nsp = this.nsp.name;
        const encodedPackets = this.encoder.encode(packet);
        const topic = opts.rooms.size === 0
            ? this.nsp.name
            : `${this.nsp.name}${SEPARATOR}${opts.rooms.keys().next().value}`;
        debug("fast publish to %s", topic);
        // fast publish for clients connected with WebSocket
        encodedPackets.forEach((encodedPacket) => {
            const isBinary = typeof encodedPacket !== "string";
            // "4" being the message type in the Engine.IO protocol, see https://github.com/socketio/engine.io-protocol
            app.publish(topic, isBinary ? encodedPacket : "4" + encodedPacket, isBinary);
        });
        this.apply(opts, (socket) => {
            if (socket.conn.transport.name !== "websocket") {
                // classic publish for clients connected with HTTP long-polling
                socket.client.writeToEngine(encodedPackets, basePacketOpts);
            }
        });
    };
}
function subscribe(namespaceName, socket, isNew, rooms) {
    // @ts-ignore
    const sessionId = socket.conn.id;
    // @ts-ignore
    const websocket = socket.conn.transport.socket;
    if (isNew) {
        debug("subscribe connection %s to topic %s", sessionId, namespaceName);
        websocket.subscribe(namespaceName);
    }
    rooms.forEach((room) => {
        const topic = `${namespaceName}${SEPARATOR}${room}`; // '#' can be used as wildcard
        debug("subscribe connection %s to topic %s", sessionId, topic);
        websocket.subscribe(topic);
    });
}
function restoreAdapter() {
    socket_io_adapter_1.Adapter.prototype.addAll = addAll;
    socket_io_adapter_1.Adapter.prototype.del = del;
    socket_io_adapter_1.Adapter.prototype.broadcast = broadcast;
}
const toArrayBuffer = (buffer) => {
    const { buffer: arrayBuffer, byteOffset, byteLength } = buffer;
    return arrayBuffer.slice(byteOffset, byteOffset + byteLength);
};
// imported from https://github.com/kolodziejczak-sz/uwebsocket-serve
function serveFile(res /* : HttpResponse */, filepath) {
    const { size } = (0, fs_1.statSync)(filepath);
    const readStream = (0, fs_1.createReadStream)(filepath);
    const destroyReadStream = () => !readStream.destroyed && readStream.destroy();
    const onError = (error) => {
        destroyReadStream();
        throw error;
    };
    const onDataChunk = (chunk) => {
        const arrayBufferChunk = toArrayBuffer(chunk);
        res.cork(() => {
            const lastOffset = res.getWriteOffset();
            const [ok, done] = res.tryEnd(arrayBufferChunk, size);
            if (!done && !ok) {
                readStream.pause();
                res.onWritable((offset) => {
                    const [ok, done] = res.tryEnd(arrayBufferChunk.slice(offset - lastOffset), size);
                    if (!done && ok) {
                        readStream.resume();
                    }
                    return ok;
                });
            }
        });
    };
    res.onAborted(destroyReadStream);
    readStream
        .on("data", onDataChunk)
        .on("error", onError)
        .on("end", destroyReadStream);
}