nflow/src/logger.js

event/data/control flow

import {isInternal, serialise} from './utils'
import { UNSET } from './consts'

var loggers = []

function log (flow, name, newData, oldData) {
  if (!isInternal(flow)) {
    loggers.forEach(f => {
      f.isRemote
        ? f.logger(remoteLog(flow, name, newData, oldData), flow)
        : f.logger(flow, name, newData, oldData)
    })
    debug(flow, name, newData, oldData)
  }
}

function debug (flow, name, newData, oldData) {
  typeof global !== 'undefined' &&
  global.__nflow_devtools_hook__ &&
  global.__nflow_devtools_hook__(
    remoteLog(flow, name, newData, oldData), flow)
}

const propMap = {
  'start': ['version', 'status'],
  'cancel': ['status'],
  'create': ['status'],
  'emitted': ['recipients']
}
/*
 *  Converts a local log message(direct references) to a remote one(unmarshallable)
 */
function remoteLog (flow, name, d, d0) {
  let o = {
    flow: flow.toObj('name', 'guid'),
    action: name
  }
  let props = ['name', 'guid']
  propMap[name] && props.push(...propMap[name])
  if (name === 'create' && d.data() !== undefined) props.push('data')
  let newData = (d && d.toObj ? d.toObj(...props) : serialise(d))
  let oldData = (d0 && d0.toObj ? d0.toObj(...props) : serialise(d0))
  if (newData !== undefined) o.d = newData
  if (oldData !== undefined) o.d0 = oldData
  return o
}

function init (flow) {
  flow.enableDevTools = (enabled = true) => {
    console.warn('flow.enableDevtools() is now deprecated. nflow-devtools will automatically start logging when Chrome devtools is open')
    return flow
  }

  flow.logger = (logger = UNSET, isRemote = false) => {
    if (logger === UNSET) return loggers
    else loggers.push({logger, isRemote})
    return flow
  }
  flow.logger.reset = () => { loggers = [] }
  debug(flow, 'start', flow)
}

export default {
  init,
  log
}