title: Make airflow read from S3 and post to slack?
body: <p>I have a requirement where I want my airflow job to read a file from S3 and post its contents to slack.</p>
  
  <p>Background</p>
  
  <p>Currently, the airflow job has an S3 key sensor that waits for a file to be put in an S3 location and if that file doesn't appear in the stipulated time, it fails and pushes error messages to slack. </p>
  
  <p>What needs to be done now</p>
  
  <p>If airflow job succeeds, it needs to check another S3 location and if file there exists, then push its contents to slack. </p>
  
  <p>Is this usecase possible with airflow?</p>