@8select/strulo/lib/es6/index.js.flow

Log messages in a structured format.

// @flow

import createLogger from 'debug'
import { getLevelName, logLevels } from './log-levels'
import { formatMessage } from './message'

import type { LogLevel } from './log-levels'
import type { Message } from './message'

const logFunctions = Object.keys(logLevels).reduce(buildLogFunctionPerLogLevel, {})

export const debug = (message: Message): void => {
  logFunctions.debug(message)
}
export const info = (message: Message): void => {
  logFunctions.info(message)
}
export const notice = (message: Message): void => {
  logFunctions.notice(message)
}
export const warning = (message: Message): void => {
  logFunctions.warning(message)
}
export const error = (message: Message): void => {
  logFunctions.error(message)
}
export const critical = (message: Message): void => {
  logFunctions.critical(message)
}
export const alert = (message: Message): void => {
  logFunctions.alert(message)
}
export const emergency = (message: Message): void => {
  logFunctions.emergency(message)
}

function buildLogFunctionPerLogLevel(previousObjectWithLogFunctions: Object, currentLogLevel: LogLevel) {
  return Object.assign(
    previousObjectWithLogFunctions,
    {},
    {
      [getLevelName(currentLogLevel).toLowerCase()]: log(currentLogLevel),
    }
  )
}

function log(level: LogLevel): Function {
  const logger = createLogger(getLevelName(level))

  return function(message: Message): void {
    logger(formatMessage(level, message))
  }
}

export default {
  debug,
  info,
  notice,
  warning,
  error,
  critical,
  alert,
  emergency,
}