app.server.js

/**
 *
 * REQUIREMENTS
 *
 */
const {build: buildEnvironmentConfig} = require('./bootstrap/environment.js');
const {build: buildFileConfiguration} = require('./bootstrap/flatfile.js');
const {LOG_LEVELS} = require('../src/javascript/shared/constants/index.js');
const {general: {mergeDeep, fetchValueFromObject, fillObject}} = require('../src/javascript/shared/utilities/index.js');
const NPMPackageJSON = require('../package.json');
const {Server: {TroublesomeServer}} = require('../src/javascript/index.js')
const {Logger, Transports: {Console: ConsoleLoggerTransport}} = require('../src/javascript/shared/logger/index.js');

/**
 *
 * CONSTANTS
 *
 */

const {
    DEFAULT_FLATFILE_PATHS
} = require('./bootstrap/constants.js');

/**
 *
 * FUNCTIONS
 *
 */

const pickClientOptions = (configuration = {}, logger) => {
    if (!configuration || !configuration.client || !Array.isArray(configuration.client.__SERVER_OPTIONS)) {
        return configuration;
    }

    for (const server_option of configuration.client.__SERVER_OPTIONS) {
        const value = fetchValueFromObject(server_option, undefined, configuration);
        const key_pieces = ['client', ...server_option.split('=>')];
        configuration = mergeDeep(configuration, fillObject(key_pieces, value));
    }

    return configuration;
};

const cleanClientOptions = (configuration, logger) => {
    if (!configuration || !configuration.client || !Array.isArray(configuration.client.__SERVER_OPTIONS)) {
        return configuration;
    }

    delete configuration.client.__SERVER_OPTIONS;

    return configuration;
}

const loadConfiguration = async (logger) => {
    logger.info("Loading Configurations");

    const environmental_options = buildEnvironmentConfig(process.env);
    const file_paths = fetchValueFromObject("bootstrap=>flatfile_paths", '').split(';').filter(el => !!el);

    logger.fine("Loading FlatFile configurations from %s", [...DEFAULT_FLATFILE_PATHS, ...file_paths].join(', '));

    const file_options = await buildFileConfiguration(file_paths);

    logger.fine(
        'Got %d PRIMARY key(s) from Environmental Options and %d PRIMARY key(s) from Flat File options',
        Object.keys(environmental_options).length,
        Object.keys(file_options).length
    );

    let configuration = mergeDeep(file_options, environmental_options);

    configuration = pickClientOptions(configuration, logger);
    configuration = cleanClientOptions(configuration, logger);

    return configuration;
};

/**
 *
 * BOOTSTRAP
 *
 */

const logger = new Logger({
    components: ['Bootstrap'],
    transports: [new ConsoleLoggerTransport()],
    level: LOG_LEVELS.DEBUG
});

loadConfiguration(logger)
    .then(configuration => {
        logger.info('Initializing %s v%s by %s', NPMPackageJSON.name, NPMPackageJSON.version, NPMPackageJSON.author);
        return new Promise((resolve, reject) => {
            try {
                return resolve(new TroublesomeServer(configuration));
            } catch(e) {
                return reject(e);
            }
        });
    })
    .then(app => app.run())
    .then(() => logger.info('Done'))
    .catch(e => {
        logger.fatal(e);
    });