slack-ops-test2-func: handling challenge event

lambda_function.py

import json
import logging

logger = logging.getLogger()
logger.setLevel(logging.INFO)

def lambda_handler(event, context):
  logger.info(json.dumps(event))
  if ('challenge' in event):
    return {
      "statusCode": 200,
      "body": json.dumps({'challenge': event['challenge']})
    }
  else: 
    process_event(event['event'])
    return { "statusCode": 200 }

def process_event(event):
  item     = event['item']
  channel  = item['channel']
  ts       = item['ts']
  reaction = event['reaction']
  logger.info('{}, {}, {}'.format(channel, ts, reaction))
  # TODO