Retrieve current bundling tasks. If no bundle id is specified, all
        tasks are retrieved.

        :type bundle_ids: list
        :param bundle_ids: A list of strings containing identifiers for
                           previously created bundling tasks.

        :type filters: dict
        :param filters: Optional filters that can be used to limit
                        the results returned.  Filters are provided
                        in the form of a dictionary consisting of
                        filter names as the key and filter values
                        as the value.  The set of allowable filter
                        names/values is dependent on the request
                        being performed.  Check the EC2 API guide
                        for details.

def get_all_bundle_tasks(self, bundle_ids=None, filters=None):
        """
        Retrieve current bundling tasks. If no bundle id is specified, all
        tasks are retrieved.

        :type bundle_ids: list
        :param bundle_ids: A list of strings containing identifiers for
                           previously created bundling tasks.

        :type filters: dict
        :param filters: Optional filters that can be used to limit
                        the results returned.  Filters are provided
                        in the form of a dictionary consisting of
                        filter names as the key and filter values
                        as the value.  The set of allowable filter
                        names/values is dependent on the request
                        being performed.  Check the EC2 API guide
                        for details.

        """

        params = {}
        if bundle_ids:
            self.build_list_params(params, bundle_ids, 'BundleId')
        if filters:
            self.build_filter_params(params, filters)
        return self.get_list('DescribeBundleTasks', params,
                             [('item', BundleInstanceTask)], verb='POST')