example.go

func updateSQS(t time.Time) {
  log.Println("Sending heartbeat to SQS")

  // create the SQS client
  client, err := sqs.NewFrom(os.Getenv("AWS_ACCESS_KEY_ID"), os.Getenv("AWS_SECRET_ACCESS_KEY"), "us.east")
  if err != nil {
    log.Println("ERROR:", err)
  }
  
  // fake an existing sqs.Message by creating it and setting the ReceiptHandle
  message := sqs.Message{}
  message.ReceiptHandle = os.Getenv("RECEIPT_HANDLE")

  // get the SQS queue
  queue, err := client.GetQueue(os.Getenv("SQS_QUEUE_NAME"))
  if err != nil {
    log.Println("ERROR:", err)
  }

  // change the sqs message visibility
  // In this case I don't care about the res object. I'm only worried if there was an err or not.
  // 
  // What is the correct way to do this?
  // 
  // The following will give a compiler error because I didn't use the res variable.
  // res, err := queue.ChangeMessageVisibility(&message, 5 * 60)
  //
  // However the following seems like it might be bad if err could potentially be of a different Type than the err on line 15.
  _, err = queue.ChangeMessageVisibility(&message, 5 * 60)
  if (err != nil) {
    log.Println("ERROR:", err)
  }
}