lambee/actions/fn-logs/transform.js

A tool to help developer work with AWS Lambda.

const R = require('ramda')
const eol = require('eol')
const chalk = require('chalk')

const justMessages = R.map(R.prop('message'))
const fixEol = R.map(eol.auto)
const splashOfColor = R.map(R.cond([
    [R.test(/^END/), chalk.gray],
    [R.test(/^START/), chalk.gray],
    [R.test(/^REPORT/), chalk.gray],
    [R.test(/\sDEBUG\s/), chalk.gray],
    [R.test(/\sWARN\s/), chalk.yellow],
    [R.test(/\sERROR\s/), chalk.red],
    [R.T, chalk.white]
]))
const filterFine = R.compose(
    R.filter(R.complement(R.startsWith('END'))),
    R.filter(R.complement(R.startsWith('START'))),
    R.filter(R.complement(R.startsWith('REPORT')))
)
const filterDebug = R.filter(R.complement(R.test(/DEBUG/)))
const filterInfo = R.filter(R.complement(R.test(/INFO/)))

/**
 * Pretty print only relevant lambda function logs.
 */
module.exports = (logLevel) => {
    switch (logLevel) {
    case 1: return R.pipe(justMessages, fixEol, splashOfColor, R.join('\n'))
    case 2: return R.pipe(justMessages, fixEol, filterFine, splashOfColor, R.join('\n'))
    case 3: return R.pipe(justMessages, fixEol, filterFine, filterDebug, splashOfColor, R.join('\n'))
    case 4: return R.pipe(justMessages, fixEol, filterFine, filterDebug, filterInfo, splashOfColor, R.join('\n'))
    }    
}