aws-cwlog cloudwatch log transform oneline format

cwlog-oneline.js

// aws-cwlog trnasform script <https://www.npmjs.com/package/aws-cwlog>
// CloudWatch Log to oneline format eg."2018-05-25T04:41:58 log message"
map(
  pipe(
    dissoc('ingestionTime'),
    over(
      lensProp('timestamp'),
      pipe(
        x => new Date(x).toISOString(),
        slice(0, -5),
      )
    ),
    over(
      lensProp('message'),
      pipe(
        tryCatch(JSON.parse, identity),
      )
    ),
    x => `${x.timestamp} ${pipe(prop('msg'), JSON.stringify)(x.message)}`
  ),
)

map(x => [
  new Date(x.timestamp).toISOString().slice(0, -5),
  JSON.parse(x.message).msg
].join(' '))