generator-theia/src/common/abstract-backend-generator.ts

Theia Generator

/*
 * Copyright (C) 2017 TypeFox and others.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
 */

import { AbstractGenerator, FileSystem } from "../common";

export abstract class AbstractBackendGenerator extends AbstractGenerator {

    protected doGenerate(fs: FileSystem, backendModules: Map<string, string>): void {
        fs.write(this.backend('server.js'), this.compileServer(backendModules));
        fs.write(this.backend('main.js'), this.compileMain(backendModules));
    }

    protected compileServer(backendModules: Map<string, string>): string {
        return `${this.compileCopyright()}
// @ts-check
require('reflect-metadata');
const path = require('path');
const express = require('express');
const { Container, injectable } = require('inversify');

const { BackendApplication } = require('@theia/core/lib/node');
const { backendApplicationModule } = require('@theia/core/lib/node/backend-application-module');
const { messagingBackendModule } = require('@theia/core/lib/node/messaging/messaging-backend-module');
const { loggerBackendModule } = require('@theia/core/lib/node/logger-backend-module');

const container = new Container();
container.load(backendApplicationModule);
container.load(messagingBackendModule);
container.load(loggerBackendModule);

function load(raw) {
    return Promise.resolve(raw.default).then(module =>
        container.load(module)
    )
}

function start(port, host) {
    const application = container.get(BackendApplication);
    application.use(express.static(path.join(__dirname, '../../lib'), {
        index: 'index.html'
    }));
    return application.start(port, host);
}

module.exports = (port, host) => Promise.resolve()${this.compileBackendModuleImports(backendModules)}
    .then(() => start(port, host)).catch(reason => {
        console.error('Failed to start the backend application.');
        if (reason) {
            console.error(reason);
        }
        throw reason;
    });`;
    }

    protected compileMain(backendModules: Map<string, string>): string {
        return `${this.compileCopyright()}
// @ts-check

const { port, hostname } = require('yargs').argv;
console.info("Starting express on port '" + port + "'.")
if (hostname) {
    console.info("Allowed host is '" + hostname + "'.")
}
module.exports = require('./server')(port, hostname);`;
    }

}