lost src and src_len in ndb.routes.create

[Tsvetk]

pyroute2 0.7.12

from pyroute2 import NDB

ndb = NDB(log='debug', auto_netns=True)

ndb.sources.add(netns='testns')  # connect to a namespace
print(ndb.sources.summary())

with ( ndb.interfaces.create(ifname='veth0', kind='veth',
           peer={'ifname':'eth0', 'net_ns_fd':'testns', }, state='up',)) as veth0:
    veth0.set(state='up')
    veth0.add_ip(address='10.0.0.1', prefixlen=24)

with ndb.interfaces.wait(target='testns', ifname='lo') as peer:  # wait for the peer
    peer.set(state='up')  # bring it up

with ndb.interfaces.wait(target='testns', ifname='eth0') as peer:  # wait for the peer
    peer.set(state='up')  # bring it up
    peer.add_ip('10.0.0.2', prefixlen=24)  # add address

ndb.routes.create(target='testns', dst='10.0.0.0/24', src='10.0.0.2/24',  oif=2 ).commit()

When create namespace : "lo" is down and in the namespace no routers from eth0 and need to create route like
10.0.0.0/24 dev veth0 proto kernel scope link src 10.0.0.1

We have next errors : src and src_len lost in line 2024-06-07 22:25:19,393

2024-06-07 22:25:19,390 DEBUG pyroute2.ndb.140716529876704.rtnl_object: ignore error 17 for {'multipath': [], 'metrics': {}, 'deps': 0, 'target': 'testns', 'dst': '10.0.0.0', 'family': <AddressFamily.AF_INET: 2>, 'dst_len': 24, 'src': '10.0.0.2', 'src_len': 24, 'oif': 2}
2024-06-07 22:25:19,391 DEBUG pyroute2.ndb.140716529876704.rtnl_object: run fallback <function fallback_add at 0x7ffb1e9a68c0> ({'target': 'testns', 'family': <AddressFamily.AF_INET: 2>, 'dst_len': 24, 'dst': '10.0.0.0', 'oif': 2, 'src': '10.0.0.2', 'src_len': 24, 'multipath': [], 'metrics': {}, 'deps': 0})
2024-06-07 22:25:19,391 DEBUG pyroute2.ndb.140716529876704.rtnl_object: ignore incomplete idx_req in the fallback
2024-06-07 22:25:19,391 DEBUG pyroute2.ndb.140716529876704.rtnl_object: stats: apply add {objid 140716492323024, wtime 0.1, mqsize 1, nqsize 0}
2024-06-07 22:25:19,393 DEBUG pyroute2.ndb.140716529876704.rtnl_object: load_sql load: ('testns', 0, 2, 24, 0, 0, 254, 4, 0, 1, 0, '10.0.0.0', None, None, 2, None, 0, None, None, None, 254, None, '', '', None, None, None, None, 0)
2024-06-07 22:25:19,393 DEBUG pyroute2.ndb.140716529876704.rtnl_object: load_sql names: ['target', 'tflags', 'family', 'dst_len', 'src_len', 'tos', 'table', 'proto', 'scope', 'type', 'flags', 'dst', 'src', 'iif', 'oif', 'gateway', 'priority', 'prefsrc', 'protoinfo', 'flow', 'table', 'mark', 'via', 'newdst', 'pref', 'encap_type', 'route_id', 'gc_mark', 'deps']
None
Traceback (most recent call last):
File "/home/tsvetkov/tests/ssl_clnt_srv_ndb.py", line 25, in
ndb.routes.create(target='testns', dst='10.0.0.0/24', src='10.0.0.2/24', oif=2 ).commit() #
File "/home/tsvetkov/.virtualenvs/tests/lib/python3.10/site-packages/pyroute2/ndb/auth_manager.py", line 67, in guard
return f(obj, *argv, **kwarg)
File "/home/tsvetkov/.virtualenvs/tests/lib/python3.10/site-packages/pyroute2/ndb/objects/init.py", line 721, in commit
raise e_i
File "/home/tsvetkov/.virtualenvs/tests/lib/python3.10/site-packages/pyroute2/ndb/objects/init.py", line 710, in commit
return self.apply(mode='commit')
File "/home/tsvetkov/.virtualenvs/tests/lib/python3.10/site-packages/pyroute2/ndb/auth_manager.py", line 67, in guard
return f(obj, *argv, **kwarg)
File "/home/tsvetkov/.virtualenvs/tests/lib/python3.10/site-packages/pyroute2/ndb/objects/route.py", line 743, in apply
return super(Route, self).apply(rollback, req_filter, mode)
File "/home/tsvetkov/.virtualenvs/tests/lib/python3.10/site-packages/pyroute2/ndb/auth_manager.py", line 67, in guard
return f(obj, *argv, **kwarg)
File "/home/tsvetkov/.virtualenvs/tests/lib/python3.10/site-packages/pyroute2/ndb/objects/init.py", line 957, in apply
if self.check():
File "/home/tsvetkov/.virtualenvs/tests/lib/python3.10/site-packages/pyroute2/ndb/objects/init.py", line 772, in check
self.load_sql()
File "/home/tsvetkov/.virtualenvs/tests/lib/python3.10/site-packages/pyroute2/ndb/objects/route.py", line 746, in load_sql
super(Route, self).load_sql(*argv, **kwarg)
File "/home/tsvetkov/.virtualenvs/tests/lib/python3.10/site-packages/pyroute2/ndb/objects/init.py", line 1136, in load_sql
self.update_from_sql(spec)
File "/home/tsvetkov/.virtualenvs/tests/lib/python3.10/site-packages/pyroute2/ndb/objects/init.py", line 1076, in update_from_sql
self.load_value(key, value)
File "/home/tsvetkov/.virtualenvs/tests/lib/python3.10/site-packages/pyroute2/ndb/objects/init.py", line 1094, in load_value
elif key in self.fields_cmp and self.fields_cmp[key](self, value):
File "/home/tsvetkov/.virtualenvs/tests/lib/python3.10/site-packages/pyroute2/ndb/objects/route.py", line 571, in _cmp_target
right = [MPLSTarget(x) for x in json.loads(right)]
File "/usr/lib/python3.10/json/init.py", line 339, in loads
raise TypeError(f'the JSON object must be str, bytes or bytearray, '
TypeError: the JSON object must be str, bytes or bytearray, not NoneType