aigoncharov

const controller = (req, res, next) => {
  loggerCls.info('Long live rocknroll!')
  // Logs something like
  // {"level":30,"time":1551385666046,"msg":"Long live rocknroll!","pid":25,"hostname":"eb6a6c70f5c4","traceID":"9ba393f0-ec8c-4396-8092-b7e4b6f375b5","v":1}
}

aigoncharov

const cls = require('cls-hooked')
const uuidv4 = require('uuid/v4')

const clsMiddleware = (req, res, next) => {
  // req and res are event emitters. We want to access CLS context inside of their event callbacks
  clsNamespace.bind(req)
  clsNamespace.bind(res)

  const traceID = uuidv4()
  const loggerWithTraceId = logger.child({ traceID })

aigoncharov

const pino = require('pino')

const logger = pino()
const loggerCls = new Proxy(logger, {
  get(target, property, receiver) {
    // Fallback to our original logger if there is no child logger in CLS
    target = clsNamespace.get('loggerCls') || target
    return Reflect.get(target, property, receiver)
  },
})

aigoncharov

const { createLogger, format, transports } = require('winston')

const addTraceId = printf((info) => {
  let message = info.message
  const traceID = clsNamespace.get('taceID')
  if (traceID) {
    message = `[TraceID: ${traceID}]: ${message}`
  }
  return message
})

aigoncharov

const controller = (req, res, next) => {
  const traceID = clsNamespace.get('traceID')
}

aigoncharov

const cls = require('cls-hooked')
const uuidv4 = require('uuid/v4')

const clsNamespace = cls.createNamespace('app')

const clsMiddleware = (req, res, next) => {
  // req and res are event emitters. We want to access CLS context inside of their event callbacks
  clsNamespace.bind(req)
  clsNamespace.bind(res)

aigoncharov

// We move that generic code to a dedicated module
import { Action, createClassReducer } from 'utils/reducer-class'

const actionTypeJediCreateInit = 'jedi-app/jedi-create-init'
const actionTypeJediCreateSuccess = 'jedi-app/jedi-create-success'
const actionTypeJediCreateError = 'jedi-app/jedi-create-error'

class ReducerJedi {
  // Take a look at "Class field delcaratrions" proposal, which is now at Stage 3.
  // https://github.com/tc39/proposal-class-fields

aigoncharov

const reducerJedi = createClassReducer(ReducerJedi)

aigoncharov

import { createReducer } from 'redux-create-reducer'

const createClassReducer = (ReducerClass) => {
  const reducerClass = new ReducerClass()
  const methodsWithActionTypes = getReducerClassMethodsWthActionTypes(
    reducerClass,
  )
  const reducerMap = getReducerMap(methodsWithActionTypes)
  const initialState = reducerClass.initialState
  const reducer = createReducer(initialState, reducerMap)

aigoncharov

const getReducerMap = (methodsWithActionTypes) =>
  methodsWithActionTypes.reduce((reducerMap, { method, actionType }) => {
    reducerMap[actionType] = method
    return reducerMap
  }, {})