def save_archival(resource, status_id, reason, url_redirected_to,
                  download_result, archive_result, log):
    '''Writes to the archival table the result of an attempt to download
    the resource.

    May propagate a CkanError.
    '''
    now = datetime.datetime.now()

    from ckanext.archiver.model import Archival, Status
    from ckan import model

    archival = Archival.get_for_resource(resource['id'])
    first_archival = not archival
    previous_archival_was_broken = None
    if not archival:
        archival = Archival.create(resource['id'])
        model.Session.add(archival)
    else:
        log.info('Archival from before: %r', archival)
        previous_archival_was_broken = archival.is_broken

    try:
        revision = model.Session.query(model.Revision) \
            .get(resource['revision_id'])
        archival.resource_timestamp = revision.timestamp
    except AttributeError:
        # CKAN 2.9 doesn't have revisions, so we can't get a timestamp
        pass

    # Details of the latest archival attempt
    archival.status_id = status_id
    archival.is_broken = Status.is_status_broken(status_id)
    archival.reason = reason
    archival.url_redirected_to = url_redirected_to

    # Details of successful archival
    if archival.is_broken is False:
        archival.cache_filepath = archive_result['cache_filepath']
        archival.cache_url = archive_result['cache_url']
        archival.size = download_result['size']
        archival.mimetype = download_result['mimetype']
        archival.hash = download_result['hash']
        archival.etag = download_result['headers'].get('etag')
        archival.last_modified = download_result['headers'].get('last-modified')

    # History
    if archival.is_broken is False:
        archival.last_success = now
        archival.first_failure = None
        archival.failure_count = 0
    else:
        log.info('First_archival=%r Previous_broken=%r Failure_count=%r' %
                 (first_archival, previous_archival_was_broken,
                  archival.failure_count))
        if first_archival or previous_archival_was_broken is False:
            # i.e. this is the first failure (or the first archival)
            archival.first_failure = now
            archival.failure_count = 1
        else:
            archival.failure_count += 1

    archival.updated = now
    log.info('Archival saved: %r', archival)
    model.repo.commit_and_remove()