Winston logger with custom Azure File/Blob Storage

Azure-logger.js

import winston from 'winston';
import { AzureBlobTransport } from 'winston-azure-transport';
import moment from 'moment-timezone';
const { combine, printf, colorize } = winston.format;

/**
 *
 * RSGI-LOGGER WITH AZURE FILE STORAGE TRANSPORT
 * Will store logs in journey wise and date wise.
 *
 * Installation:
 * npm i winston winston-azure-transport chunk moment-timezone
 *
 * Usage:
 * import Logger, { journey } from 'RSGI-LOGGER';
 *
 * const logger = new Logger(true, azureContainerUrl, journey.AROGYA_SANJEEVANI);
 *
 * logger.info('SOME INFO', { data: 'SOME DATA' });
 * logger.error('SOME ERROR', { stack: 'SOME STACK' });
 * logger.success('PAYMENT SUCCESS', { data: 'ADA' });
 */

const myFormat = winston.format.combine(
  winston.format.align(),
  printf((info) => {
    const { level, message, ...args } = info;
    const ts = moment().tz('Asia/Kolkata').format('DD-MM-YYYYThh:mm:ss:SSSA');
    const mMeta = args.meta;
    return `${ts} [${level}]: ${message} ${mMeta ? ': ' + (typeof mMeta === 'object' ? JSON.stringify(mMeta, null, 2) : mMeta) : ''}`;
  })
);

class Logger {
  transports = [
    new winston.transports.Console({
      format: combine(
        colorize({
          colors: {
            error: 'red',
            info: 'blue',
            success: 'green',
          },
        }),
        myFormat
      ),
    }),
  ];
  /**
   *
   * @param {boolean} useAzureBlogTransport (false for only console output)
   * @param {Azure container URL: String} azureContainerUrl (if useAzureBlogTransport is true than mandatory)
   * @param {Constant from this module only: string} journey (if useAzureBlogTransport is true than mandatory)
   */
  constructor(useAzureBlogTransport, azureContainerUrl, journey) {
    this.useAzureBlogTransport = useAzureBlogTransport;
    if (useAzureBlogTransport) {
      if (!azureContainerUrl || !journey) throw new Error('Cannot initialize logger without azure container url and journey');
      this.azureContainerUrl = azureContainerUrl;
      this.transports.push(
        new AzureBlobTransport({
          containerUrl: this.azureContainerUrl,
          nameFormat: journey + '/' + moment().tz('Asia/Kolkata').format('DD-MM-YYYY') + '.log',
        })
      );
    }
    this.logger = winston.createLogger({
      levels: {
        error: 0,
        info: 2,
        success: 1,
      },
      transports: this.transports,
      format: myFormat,
    });
    this.info = (message, meta) => {
      this.logger.info({ message, meta });
    };
    this.error = (message, meta) => {
      this.logger.error({ message, meta });
    };
    this.success = (message, meta) => {
      this.logger.log({ level: 'success', message, meta });
    };
  }
}

export default Logger;

export const journey = {
  CAR_INSURANCE: 'CAR_INSURANCE',
  TWO_WHEELER: 'TWO_WHEELER',
  HOME_INSURANCE: 'HOME_INSURANCE',
  PERSONAL_ACCIDENT: 'PERSONAL_ACCIDENT',
  LIFELINE_INSURANCE: 'LIFELINE_INSURANCE',
  AROGYA_SANJEEVANI: 'AROGYA_SANJEEVANI',
};