hookenv.py 文件源码

def iter_units_for_relation_name(relation_name):
    """Iterate through all units in a relation

    Generator that iterates through all the units in a relation and yields
    a named tuple with rid and unit field names.

    Usage:
    data = [(u.rid, u.unit)
            for u in iter_units_for_relation_name(relation_name)]

    :param relation_name: string relation name
    :yield: Named Tuple with rid and unit field names
    """
    RelatedUnit = namedtuple('RelatedUnit', 'rid, unit')
    for rid in relation_ids(relation_name):
        for unit in related_units(rid):
            yield RelatedUnit(rid, unit)