flexiblelog/index.js

Powerfull log system, with email, file saving, level managment

var fs = require("fs");

class logger {
  constructor(data) {
    this.consoleLog = data.consoleLog || true;
    this.fileLog = data.fileLog || false;
    this.emailNotif = data.emailNotif || false;
    if (this.emailNotif) {
      if (typeof data.email != undefined && typeof data.senderEmail != undefined && data.senderEmail.constructor.name === "Mail") {
        this.senderEmail = data.senderEmail;
        this.email = data.email;
        this.title = data.title || "Your server has an error";
      } else {
        throw new Error("email provided is not an nodemailer object");
      }
    }
    var dateWithoutTime = new Date().toISOString().split('T')[0]
    var defaultFile = process.cwd() + "\\logs\\"  + dateWithoutTime + ".txt";
    console.log('typeof data.logFile = ' + typeof data.logFile);
    if (typeof data.logFile !== 'undefined') {
      this.logFile = data.logFile;
    } else {
      this.logFile = defaultFile
      fs.mkdir(process.cwd() + "\\logs\\", { recursive: true }, function(err) {
        if (err && err.code !== 'EEXIST') throw err;
      });
    }
    console.log('path = ' + this.logFile)
    this.emailOnWarn = data.emailOnWarn || false;
    this.debugMode = data.debugMode || false;
  }

  warn(message) {
    console.log("\x1b[33m\x1b[1m[LOG - WARN] "+message+"\x1b[0m");

    if(this.fileLog) {
      fs.open(this.logFile, 'a', 666, function(e, id) {
        console.log(e)
        fs.write(id, "["+formatDate(new Date())+"] [LOG - WARN] "+message+"\r\n", null, 'utf8', function(){
          fs.close(id, function(){
            console.log('file is updated');
          });
        });
      });
    }
  }

  info(message) {
    console.log("[LOG - INFO] "+message+"\x1b[0m");

    if(this.fileLog) {
      fs.open(this.logFile, 'a', 666, function(e, id) {
        console.log(e)
        fs.write(id, "["+formatDate(new Date())+"] [LOG - INFO] "+message+"\r\n", null, 'utf8', function(){
          fs.close(id, function(){
            console.log('file is updated');
          });
        });
      });
    }
  }

  debug(message) {
    console.log("\x1b[34m\x1b[1m[LOG - DEBUG] "+message+"\x1b[0m");
  }

  error(message) {
    if (typeof message === "object" && message.stack) {
      message = message.stack; // If messge is error print callstack
    }
    console.log("\x1b[31m\x1b[1m[LOG - ERROR] "+message+"\x1b[0m");

    if(this.fileLog) {
      fs.open(this.logFile, 'a', 666, function(e, id) {
        console.log(e)
        fs.write(id, "["+formatDate(new Date())+"] [LOG - ERROR] "+message+"\r\n", null, 'utf8', function(){
          fs.close(id, function(){
            console.log('file is updated');
          });
        });
      });
    }

    if (this.emailNotif) {
      var mailOptions = {
        to: this.email,
        subject: this.title,
        text: message
      };

      var logInstance = this;
      this.senderEmail.sendMail(mailOptions, function(err, info){
        if (err) {
          logInstance.emailNotif = false;
          logInstance.error(err);
        }
        logInstance.stopScript();
      });
    } else {
      this.stopScript();
    }
  }

  stopScript(message = "Server occured an error and stop himself") {
    if (this.stopOnError) {
      console.log("\x1b[31m\x1b[1m[LOG - FATAL ERROR] " +message+"\x1b[0m");
      process.exit(1);
    }
  }
}

function formatDate(dateObj) {
  hours = dateObj.getHours();
  minutes = dateObj.getMinutes();
  seconds = dateObj.getSeconds();

  if (hours < 10) {
    hours = '0' + hours;
  }

  if (minutes < 10) {
    minutes = '0' + minutes;
  }

  if (seconds < 10) {
    seconds = '0' + seconds;
  }
  return hours + ':' + minutes + ':' + seconds;
}

exports.logger = logger;