pool_id = params_kw.get('pool_id','')
try:
    async with DBPools().sqlorContext(get_module_dbname('pcpool')) as sor:
        if pool_id:
            nodes = await sor.R('compute_node', {'pool_id': pool_id})
        else:
            nodes = await sor.R('compute_node', {})
    assigned_ids = set()
    try:
        async with DBPools().sqlorContext(get_module_dbname('pcc')) as sor:
            assigned = await sor.R('cluster_node', {})
            assigned_ids = set(str(a.node_id) for a in (assigned or []))
    except:
        pass
    available = [{'value': str(n.id), 'text': str(n.name)} for n in (nodes or []) if str(n.id) not in assigned_ids]
    return available
except:
    return []