boostr/dist/spa-server.js

Build and deploy your Layr apps

import Koa from 'koa';
import koaSend from 'koa-send';
import { WebSocketServer } from 'ws';
import { join } from 'path';
import { logMessage, throwError, fileExists } from './utilities.js';
const INDEX_PAGE = 'index.html';
export class SinglePageApplicationServer {
    constructor({ directory, serviceName, port }) {
        this.directory = directory;
        this.serviceName = serviceName;
        this.port = port;
    }
    start() {
        const koa = new Koa();
        koa.use(async (ctx) => {
            if (ctx.request.method !== 'GET') {
                ctx.throw(405);
            }
            let fileRelative = ctx.request.path.slice(1);
            if (fileRelative !== '' && fileRelative !== 'favicon.ico') {
                const file = join(this.directory, fileRelative);
                if (!fileExists(file)) {
                    fileRelative = INDEX_PAGE;
                }
            }
            const path = '/' + fileRelative;
            await koaSend(ctx, path, {
                root: this.directory,
                index: INDEX_PAGE,
                gzip: false,
                brotli: false,
                format: false
            });
        });
        return new Promise((resolve) => {
            if (this._server !== undefined) {
                throwError('The single-page application server is already started', {
                    serviceName: this.serviceName
                });
            }
            this._server = koa.listen(this.port, () => {
                this._webSocketServer = new WebSocketServer({ server: this._server });
                logMessage(`Single-page application server started at http://localhost:${this.port}/`, {
                    serviceName: this.serviceName
                });
                resolve();
            });
        });
    }
    restartClients() {
        if (this._webSocketServer !== undefined) {
            for (const webSocket of this._webSocketServer.clients) {
                webSocket.send('restart');
            }
        }
    }
}
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