nodered_cfg/node_modules/node-red-contrib-logger/loggerNode.js

const Logger = require("./logger");
const logger = new Logger("logger Node");
logger.sendInfo("Copyright 2020 Jaroslav Peter Prib");

if(logger.active) logger.send("test active");

const adminActions=["setOn","setOff"];
const MaxMsgOutSize=1000;
let maxReportErrors=10;
module.exports = function (RED) {
	function loggerNode (n) {
		RED.nodes.createNode(this, n);
		var node = Object.assign(this, n);
		if(node.active) logger.send({label:"initialising",parameters:n});
		node.logger=new Logger({
			label:"logger Node:"+(node.name||node.id),
			count:node.count
		});
		node.logger.setNodeStatus(node);
		node.on('input', function (msg) {
			if(node.logger.active) try {
				let processed=[];
				const msgString=JSON.stringify(msg,(k,v)=>{
					  if (typeof v === 'object') {
						  const i=processed.findIndex((c)=>c===v)
						  if(i>-1)  return "<***circular reference***>";
						  processed.push(v);
					}
					return v;
				})
				node.logger.send({label:"input",message:msgString});
				if(node.sendOutputLog)
					node.send([null,msg]);
				if(node.sendConsoleLog)
					node.log(msg);
			} catch(ex) {
				if(maxReportErrors) {
					maxReportErrors--;
					node.logger.send({label:"input error",error:ex.error,stack:ex.stack});
				}
			}
			node.send(msg);
		});
		node.on('close', function (removed, done) {
		  node.connection.close(false, () => {
			if(node.logger.active) node.logger.send({label:"close"});
		  });
		  done();
		});
	}
	RED.nodes.registerType('Logger', loggerNode);
	RED.httpAdmin.get('/Logger/:id/:action/', RED.auth.needsPermission('Logger.write'), function (req, res) {
		if(logger.active) logger.send({label:"httpAdmin",request:{params:req.params}});
		const node = RED.nodes.getNode(req.params.id)
		if (node && node.type === 'Logger') {
			try {
				if (adminActions.includes(req.params.action)) {
					node.logger[req.params.action]();
					return;
				}
				throw Error('unknown action: ' + req.params.action)
			} catch (err) {
				const reason1 = 'Internal Server Error, ' + req.params.action + ' failed ' + err.toString()
				if(node.logger.active) node.logger.send({label:"httpAdmin", request:req.params,error:reason1});
				res.status(500).send(reason1);
			}
		} else {
			const reason2 = 'request to ' + req.params.action + ' failed for id:' + req.params.id;
			if(logger.active) logger.send({label:"httpAdmin",error:reason2});
			res.status(404).send(reason2);
		}
	});
};