module.exports = function fetchRecords() {
    return openConnection()
        .then(fetchRecords)
        .then(groupById)
        .catch(rethrow)
        .done(closeConnection);
}

function closeConnection(result) {
   releaseConnection();
   return result;
}

resource.fetchRecords().then(/*do something else*/);

resource
  .openConnection()
  .then(resource.fetchRecords)
  .then(/*do something else*/)
  .catch(/*..*/)
  .end(resource.close)

module.exports = function fetchRecords() {
    return openConnection()
        .then(fetchRecords)
        .then(groupById)
        .then(closeConnection)
        .catch(rethrow);
}

module.exports = function fetchRecords() {
    return openConnection()
        .then(fetchRecords)
        .then(groupById)
        .catch(rethrow)
        .finally(closeConnection);
}