microservice-support-toolkit/lib/core/logger.js

A global module with commons utilities for microservice support

const bunyan = require('bunyan');
const YAML = require('yaml');
const path = require('path');
const fs = require('fs');

let APPNAME = 'microservice';
const FILEPATH = path.join(__dirname, '../../../../log/app.log');

const init = () => {
  try {
    const filePath = path.join(__dirname, '../../../../resources/bootstrap.yml');
    const file = fs.readFileSync(filePath, 'utf8');
    const yamlFile = YAML.parse(file);
    APPNAME = yamlFile.app.name;
  } catch (err) {
    console.error('/resources/bootstrap.yml NOT FOUND !!!!', err);
  }
};

init();

// Override console
console.authorizedOutput = console.log;
console.log   = (msg, params) => (params ? logger.trace(msg, params) : logger.trace(msg));
console.trace = (msg, params) => (params ? logger.trace(msg, params) : logger.trace(msg));
console.debug = (msg, params) => (params ? logger.trace(msg, params) : logger.trace(msg));
console.info  = (msg, params) => (params ? logger.trace(msg, params) : logger.trace(msg));
console.warn  = (msg, params) => (params ? logger.trace(msg, params) : logger.trace(msg));
console.error = (msg, params) => (params ? logger.trace(msg, params) : logger.trace(msg));

function RawStream() {}
RawStream.prototype.write = function (rec) {
  console.authorizedOutput(`[${formatDateTime(new Date(rec.time.toISOString()))}] ${bunyan.nameFromLevel[rec.level].toUpperCase()} ${rec.msg}`);
};

const consoleStreamConfig = {
  level: 'trace',
  type: 'raw',
  stream: new RawStream()
};

const fileStreamConfig = {
  level: 'debug',
  type: 'rotating-file',
  path: FILEPATH,
  period: '1d',
  count: 3
};

const logger = bunyan.createLogger({
  name: APPNAME,
  streams: [
    fileStreamConfig,
    consoleStreamConfig
  ]
});

const formatDateTime = time => {
  const year = time.getFullYear();
  const month = pad(time.getMonth() + 1, 2);
  const day = pad(time.getDate(), 2);
  const hour = pad(time.getHours(), 2);
  const minutes = pad(time.getMinutes(), 2);
  const seconds = pad(time.getSeconds(), 2);
  const milliseconds = pad(time.getMilliseconds(), 3);

  return `${day}-${month}-${year} ${hour}:${minutes}:${seconds}.${milliseconds}`;
};

const pad = (number, size = 0) => {
  let s = String(number);

  while (s.length < size) {
    s = `0${s}`;
  }

  return s;
};

const handleMessage = (actionName, msg) => `${actionName ? `${actionName} - ` : ''}${msg}`;

module.exports = {
  trace:  (msg, params,  actionName) => (params ? logger.trace(handleMessage(actionName, msg), params) : logger.trace(handleMessage(actionName, msg))),
  debug:  (msg, params,  actionName) => (params ? logger.debug(handleMessage(actionName, msg), params) : logger.debug(handleMessage(actionName, msg))),
  info:   (msg, params,  actionName) => (params ? logger.info(handleMessage(actionName , msg), params) : logger.info(handleMessage(actionName , msg))),
  warn:   (msg, params,  actionName) => (params ? logger.warn(handleMessage(actionName , msg), params) : logger.warn(handleMessage(actionName , msg))),
  error:  (msg, params,  actionName) => (params ? logger.error(handleMessage(actionName, msg), params) : logger.error(handleMessage(actionName, msg))),
  fatal:  (msg, params,  actionName) => (params ? logger.fatal(handleMessage(actionName, msg), params) : logger.fatal(handleMessage(actionName, msg)))
};