Dear everyone,
I'm currently trying to use Ryu to control our switches. I'm new to Ryu,
so I might just be doing stuff wrong. Also, I couldn't find an 'Issues'
tab on GitHub. Is this the correct place to report bugs?
Setup:
Downloaded Ryu from source `git clone git://github.com/osrg/ryu.git`
Installed Ryu `cd ryu; python ./setup.py install`
Run with `ryu-manager l2.py`
Ryu function:
OFPFlowMod._serialize_body() in /ryu/ryu/ofproto/ofproto_v1_3_parser.py
Trace:
hub: uncaught exception: Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/ryu/lib/hub.py", line 52,
in _launch
func(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/ryu/base/app_manager.py",
line 275, in _event_loop
handler(ev)
File "/home/karel/ryu/karel/l2.py", line 47, in
port_desc_stats_reply_handler
self.use_case_2(recieved_datapath)
File "/home/karel/ryu/karel/l2.py", line 122, in use_case_2
self.ofdpa_instance.create_flow_vlan(port_ids, vlan)
File "/home/karel/ryu/karel/ofdpa.py", line 210, in create_flow_vlan
test.convert(mod)
File "/home/karel/ryu/karel/Ryu_to_REST.py", line 23, in convert
print mod._serialize_body()
File
"/usr/local/lib/python2.7/dist-packages/ryu/ofproto/ofproto_v1_3_parser.py",
line 2487, in _serialize_body
self.out_group, self.flags)
File "/usr/local/lib/python2.7/dist-packages/ryu/lib/pack_utils.py",
line 21, in msg_pack_into
if len(buf) < offset:
TypeError: object of type 'NoneType' has no len()
Possible cause:
Function passes `self.buf` to `msg_pack_into`, but `self.buf` is never
defined, thus resulting in a NoneType TypeError
Additional info:
Seems all _serialize_body() functions in ofproto_v1_3_parser.py work
this way, and will give the same error.
Background:
I've written some examples for our switches in Ryu. An important part of
our partners is working in OpenDaylight instead of Ryu, so I'd like to
convert my examples to OpenDaylight. I figured the easiest way to do is
convert the OFPFlowMod to a JSON that the OpenDaylight REST API can
handle. It seems that the OFPFlowMod._serialize_body() is the native
function to serialize the OFPFlowMod data, bringing it one step closer
to OpenDaylight REST API compatibility.
Am I using this function correctly? If so, is this indeed a bug? Can
someone fix it? Of course I can also give fixing it myself a shot if
desired.
Thanks and kind regards,
Karel van de Plassche
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