node-test-bed-adapter/dist/lib/logger/logger.mjs

An adapter to connect a node.js application to the Test-bed's Common Information Space or Common Simulation Space.

import { EventEmitter } from 'events';
import { LogLevel } from './log-levels.mjs';
/**
 * Singleton logger, who is given a list of loggers that do the actual logging.
 *
 * Event emitter:
 * 'error': Returns logger's error
 * 'message': Returns logger's message
 */
export class Logger extends EventEmitter {
    static _instance;
    loggers = [];
    minLevel = LogLevel.Critical;
    isInitialized = false;
    constructor() {
        super();
    }
    static get instance() {
        if (!Logger._instance) {
            Logger._instance = new Logger();
        }
        return Logger._instance;
    }
    initialize(loggers) {
        this.loggers = loggers;
        this.setMinLogLevel();
        this.isInitialized = true;
    }
    addLogger(logger) {
        this.loggers.push(logger);
        this.setMinLogLevel();
    }
    info(msg) {
        this.log(LogLevel.Info, msg);
    }
    debug(msg) {
        this.log(LogLevel.Debug, msg);
    }
    warn(msg) {
        this.log(LogLevel.Warn, msg);
    }
    error(msg) {
        this.log(LogLevel.Error, msg);
    }
    critical(msg) {
        this.log(LogLevel.Critical, msg);
    }
    sill(msg) {
        this.log(LogLevel.Sill, msg);
    }
    setMinLogLevel() {
        this.minLevel = this.loggers.reduce((p, c) => (c.minLevel < p ? c.minLevel : p), Number.MAX_SAFE_INTEGER);
    }
    log(level, msg) {
        if (!this.isInitialized || level < this.minLevel || !this.loggers) {
            return;
        }
        const message = typeof msg === 'object' ? JSON.stringify(msg) : msg;
        this.loggers
            .filter((logger) => level >= logger.minLevel)
            .forEach((logger) => logger.logger.log(level, message, (err, result) => {
            if (err) {
                this.emit('error', err);
            }
            else if (result) {
                this.emit('message', result);
            }
        }));
    }
}
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