no function clause matching xmerl_lib:expand_element

[budnyjj]

Hello! I'm trying to tie up LINC and Ryu with OFConfig protocol.

I work with latest version of LINC (master branch), Ryu (3.19) and Erlang (R17, installed from erlang package from erlang solutions), guided by test-of-conig-with-linc doc.

I run LINC with following configuration:

[{linc,
     [{of_config,enabled},
      {capable_switch_ports,
          [{port,1,[{interface,"linc-port"}]},
           {port,2,[{interface,"linc-port2"}]},
           {port,3,[{interface,"linc-port3"}]},
           {port,4,[{interface,"linc-port4"}]}]},
      {capable_switch_queues,
          [
            {queue,991,[{min_rate,10},{max_rate,120}]},
            {queue,992,[{min_rate,10},{max_rate,130}]},
            {queue,993,[{min_rate,200},{max_rate,300}]},
            {queue,994,[{min_rate,400},{max_rate,900}]}
            ]},
      {logical_switches,
          [{switch,0,
               [{backend,linc_us4},
                {controllers,[{"Switch0-Default-Controller","127.0.0.1",6633,tcp}]},
                {controllers_listener,{"127.0.0.1",9998,tcp}},
                {queues_status,enabled},
                {ports,[{port,1,{queues,[]}},{port,2,{queues,[991,992]}}]}]}
                ,
           {switch,7,
               [{backend,linc_us3},
                {controllers,[{"Switch7-Controller","127.0.0.1",6633,tcp}]},
                {controllers_listener,disabled},
                {queues_status,enabled},
                {ports,[{port,4,{queues,[]}},{port,3,{queues,[993,994]}}]}]}
        ]}]},
 {enetconf,
     [{capabilities,
          [{base,{1,0}},
           {base,{1,1}},
           {startup,{1,0}},
           {'writable-running',{1,0}}]},
      {callback_module,linc_ofconfig},
      {sshd_ip,{127,0,0,1}},
      {sshd_port,1830},
      {sshd_user_passwords,[{"linc","linc"}]}]},
 {lager,
     [{handlers,
          [{lager_console_backend,debug},
           {lager_file_backend,
               [{"log/error.log",error,10485760,"$D0",5},
                {"log/console.log",info,10485760,"$D0",5}]}]}]},
 {sasl,
     [{sasl_error_logger,{file,"log/sasl-error.log"}},
      {errlog_type,error},
      {error_logger_mf_dir,"log/sasl"},
      {error_logger_mf_maxbytes,10485760},
      {error_logger_mf_maxfiles,5}]},
 {sync,[{excluded_modules,[procket]}]}].

and use this script as basic connectivity test:

from ryu.base import app_manager
from ryu.lib import hub
from ryu.lib.of_config import capable_switch

HOST = '127.0.0.1'
PORT = 1830
USERNAME = 'linc'
PASSWORD = 'linc'

class OFConfigClient(app_manager.RyuApp):
        def __init__(self, *args, **kwargs):
                super(OFConfigClient, self).__init__(*args, **kwargs)
                self.switch = capable_switch.OFCapableSwitch(
                        host=HOST, port=PORT, username=USERNAME, password=PASSWORD,
                        unknown_host_cb=lambda host, fingerprint: True)

        def get(self):
                data_xml = self.switch.get()
                print data_xml

if __name__ == '__main__':
        client = OFConfigClient()
        client.get()

Unfortunately, instead of correct response I get following message:

2:32:46.599 [debug] Supervisor {<0.22248.0>,ssh_subsystem_sup} started ssh_channel_sup:start_link([{address,{127,0,0,1}},{port,1830},{role,server},{socket_opts,[inet,inet,{ip,{127,0,0,1}}]},{ssh_opts,...}]) at pid <0.22249.0>
12:32:46.599 [debug] Supervisor {<0.22248.0>,ssh_subsystem_sup} started ssh_connection_sup:start_link([{address,{127,0,0,1}},{port,1830},{role,server},{socket_opts,[inet,inet,{ip,{127,0,0,1}}]},{ssh_opts,...}]) at pid <0.22250.0>
12:32:46.599 [debug] Supervisor 'ssh_system_{127,0,0,1}_1830_sup' started ssh_subsystem_sup:start_link([{address,{127,0,0,1}},{port,1830},{role,server},{socket_opts,[inet,inet,{ip,{127,0,0,1}}]},{ssh_opts,...}]) at pid <0.22248.0>
12:32:46.622 [debug] Supervisor {<0.22249.0>,ssh_channel_sup} started ssh_channel:start_link(<0.22251.0>, 0, enetconf_ssh, [], undefined) at pid <0.22252.0>
12:32:46.768 [info] Received: <<"<?xml version='1.0' encoding='UTF-8'?>\n<nc:rpc xmlns:nc=\"urn:ietf:params:xml:ns:netconf:base:1.0\" message-id=\"urn:uuid:e566c126-d2d1-11e4-9847-525400cf93cf\"><nc:get /></nc:rpc>">>

12:32:46.771 [info] SSH connection with subsystem: enetconf_ssh terminated with state: {state,<0.22251.0>,0,15,enetconf_fm_eom,{eom_parser,<<>>},linc_ofconfig}
12:32:46.771 [error] gen_server <0.22252.0> terminated with reason: no function clause matching xmerl_lib:expand_element(2, 1, [{port,3},{queue,5},{resources,2},{'capable-switch',1},{data,1},{'rpc-reply',1}], false) line 151
12:32:46.771 [error] CRASH REPORT Process <0.22252.0> with 0 neighbours exited with reason: no function clause matching xmerl_lib:expand_element(2, 1, [{port,3},{queue,5},{resources,2},{'capable-switch',1},{data,1},{'rpc-reply',1}], false) line 151 in gen_server:terminate/7 line 804
12:32:46.771 [error] Supervisor {<0.22249.0>,ssh_channel_sup} had child #Ref<0.0.0.6924> started with {ssh_channel,start_link,undefined} at <0.22252.0> exit with reason no function clause matching xmerl_lib:expand_element(2, 1, [{port,3},{queue,5},{resources,2},{'capable-switch',1},{data,1},{'rpc-reply',1}], false) line 151 in context child_terminated

on the LINC side, and following message

Traceback (most recent call last):
  File "test_linc_ofconfig.py", line 43, in <module>
    client.get()
  File "test_linc_ofconfig.py", line 18, in get
    data_xml = self.switch.get()
  File "/home/budnyjj/ryu/ryu/lib/of_config/capable_switch.py", line 111, in get
    return ofc.OFCapableSwitchType.from_xml(self.raw_get(), self.namespace)
  File "/home/budnyjj/ryu/ryu/lib/of_config/capable_switch.py", line 98, in raw_get
    reply = self.netconf.get(filter)
  File "/home/budnyjj/ryu/ryu/contrib/ncclient/manager.py", line 78, in wrapper
    return self.execute(op_cls, *args, **kwds)
  File "/home/budnyjj/ryu/ryu/contrib/ncclient/manager.py", line 132, in execute
    raise_mode=self._raise_mode).request(*args, **kwds)
  File "/home/budnyjj/ryu/ryu/contrib/ncclient/operations/retrieve.py", line 65, in request
    return self._request(node)
  File "/home/budnyjj/ryu/ryu/contrib/ncclient/operations/rpc.py", line 284, in _request
    raise self._error
ncclient.transport.errors.SessionCloseError: Unexpected session close

on the Ryu side.

[budnyjj]

Update code to reproduce bug.