"TypeError: cannot unpack non-iterable NoneType object"

[sajith]

This surfaced when testing SDX Controller. I think this happens when the static topologies are added in an unexpected order, perhaps? I'm not sure.

sdx-controller-sdx-controller-1  | INFO:sdx_pce.load_balancing.te_solver:Adding edge (9, 7) for request ConnectionRequest(source=9, destination=6, required_bandwidth=10, required_latency=300)                                                                                                                              
sdx-controller-sdx-controller-1  | INFO:sdx_pce.load_balancing.te_solver:Adding edge (7, 2) for request ConnectionRequest(source=9, destination=6, required_bandwidth=10, required_latency=300)                                                                                                                              
sdx-controller-sdx-controller-1  | INFO:sdx_pce.load_balancing.te_solver:Adding edge (2, 0) for request ConnectionRequest(source=9, destination=6, required_bandwidth=10, required_latency=300)                                                                                                                              
sdx-controller-sdx-controller-1  | INFO:sdx_pce.load_balancing.te_solver:Adding edge (0, 4) for request ConnectionRequest(source=9, destination=6, required_bandwidth=10, required_latency=300)                                                                                                                              
sdx-controller-sdx-controller-1  | INFO:sdx_pce.load_balancing.te_solver:Adding edge (4, 6) for request ConnectionRequest(source=9, destination=6, required_bandwidth=10, required_latency=300)                                                                                                                              
sdx-controller-sdx-controller-1  | INFO:sdx_pce.load_balancing.te_solver:solution_translator result: ConnectionSolution(connection_map={ConnectionRequest(source=9, destination=6, required_bandwidth=10, required_latency=300): [ConnectionPath(source=9, destination=7), ConnectionPath(source=7, destination=2), ConnectionPath(source=2, destination=0), ConnectionPath(source=0, destination=4), ConnectionPath(source=4, destination=6)]}, cost=5.0, request_id='test-connection-request')                                                                                                                                                           
sdx-controller-sdx-controller-1  | INFO:sdx_pce.topology.temanager:domain: ConnectionRequest(source=9, destination=6, required_bandwidth=10, required_latency=300), links: [ConnectionPath(source=9, destination=7), ConnectionPath(source=7, destination=2), ConnectionPath(source=2, destination=0), ConnectionPath(source=0, destination=4), ConnectionPath(source=4, destination=6)]
sdx-controller-sdx-controller-1  | INFO:sdx_pce.topology.temanager:count: 0, link: ConnectionPath(source=9, destination=7)
sdx-controller-sdx-controller-1  | INFO:sdx_pce.topology.temanager:source node: {'id': 'urn:ogf:network:sdx:node:zaoxi:A1'}, destination node: {'id': 'urn:ogf:network:sdx:node:zaoxi:B1'}                                                                                                                                   
sdx-controller-sdx-controller-1  | INFO:sdx_pce.topology.temanager:source domain: urn:ogf:network:sdx:topology:zaoxi.net, destination domain: urn:ogf:network:sdx:topology:zaoxi.net                                                                                                                                         
sdx-controller-sdx-controller-1  | INFO:sdx_pce.topology.temanager:count: 1, link: ConnectionPath(source=7, destination=2)
sdx-controller-sdx-controller-1  | INFO:sdx_pce.topology.temanager:source node: {'id': 'urn:ogf:network:sdx:node:zaoxi:B1'}, destination node: {'id': 'urn:ogf:network:sdx:node:sax:B3'}                                                                                                                                     
sdx-controller-sdx-controller-1  | INFO:sdx_pce.topology.temanager:source domain: urn:ogf:network:sdx:topology:zaoxi.net, destination domain: urn:ogf:network:sdx:topology:sax.net                                                                                                                                           
sdx-controller-sdx-controller-1  | INFO:sdx_pce.topology.temanager:count: 2, link: ConnectionPath(source=2, destination=0)
sdx-controller-sdx-controller-1  | INFO:sdx_pce.topology.temanager:source node: {'id': 'urn:ogf:network:sdx:node:sax:B3'}, destination node: {'id': 'urn:ogf:network:sdx:node:sax:B1'}                                                                                                                                       
sdx-controller-sdx-controller-1  | INFO:sdx_pce.topology.temanager:source domain: urn:ogf:network:sdx:topology:sax.net, destination domain: urn:ogf:network:sdx:topology:sax.net                                                                                                                                             
sdx-controller-sdx-controller-1  | INFO:sdx_pce.topology.temanager:count: 3, link: ConnectionPath(source=0, destination=4)
sdx-controller-sdx-controller-1  | INFO:sdx_pce.topology.temanager:source node: {'id': 'urn:ogf:network:sdx:node:sax:B1'}, destination node: {'id': 'urn:sdx:node:amlight.net:B1'}                                                                                                                                           
sdx-controller-sdx-controller-1  | INFO:sdx_pce.topology.temanager:source domain: urn:ogf:network:sdx:topology:sax.net, destination domain: urn:ogf:network:sdx:topology:amlight.net                                                                                                                                         
sdx-controller-sdx-controller-1  | INFO:sdx_pce.topology.temanager:count: 4, link: ConnectionPath(source=4, destination=6)
sdx-controller-sdx-controller-1  | INFO:sdx_pce.topology.temanager:source node: {'id': 'urn:sdx:node:amlight.net:B1'}, destination node: {'id': 'urn:sdx:node:amlight.net:A1'}                                                                                                                                               
sdx-controller-sdx-controller-1  | INFO:sdx_pce.topology.temanager:source domain: urn:ogf:network:sdx:topology:amlight.net, destination domain: urn:ogf:network:sdx:topology:amlight.net                                                                                                                                     
sdx-controller-sdx-controller-1  | INFO:sdx_pce.topology.temanager:[intermediate] breakdown: {'urn:ogf:network:sdx:topology:zaoxi.net': [ConnectionPath(source=9, destination=7), ConnectionPath(source=7, destination=2)], 'urn:ogf:network:sdx:topology:sax.net': [ConnectionPath(source=2, destination=0), ConnectionPath(source=0, destination=4)], 'urn:ogf:network:sdx:topology:amlight.net': [ConnectionPath(source=4, destination=6)]}
sdx-controller-sdx-controller-1  | INFO:sdx_pce.topology.temanager:Creating domain_breakdown: domain: urn:ogf:network:sdx:topology:zaoxi.net, links: [ConnectionPath(source=9, destination=7), ConnectionPath(source=7, destination=2)]                                                                                      
sdx-controller-sdx-controller-1  | INFO:sdx_pce.topology.temanager:segment for urn:ogf:network:sdx:topology:zaoxi.net: {'ingress_port': {'id': 'urn:ogf:network:sdx:port:zaoxi:A1:1', 'label_range': ['100-200', '1000'], 'name': 'Novi100:1', 'node': 'urn:ogf:network:sdx:node:zaoxi:A1', 'short_name': 'A1:1', 'status': 'up'}, 'egress_port': {'id': 'urn:ogf:network:sdx:port:zaoxi:B1:1', 'name': 'Novi01:1', 'node': 'urn:ogf:network:sdx:node:zaoxi:B1', 'short_name': 'B1:1', 'label_range': ['100-200', '10001'], 'status': 'up'}}                                                                                                               
sdx-controller-sdx-controller-1  | INFO:sdx_pce.topology.temanager:Creating domain_breakdown: domain: urn:ogf:network:sdx:topology:sax.net, links: [ConnectionPath(source=2, destination=0), ConnectionPath(source=0, destination=4)]                                                                                        
sdx-controller-sdx-controller-1  | ERROR:sdx_controller:Exception on /SDX-Controller/1.0.0/connection [POST]
sdx-controller-sdx-controller-1  | Traceback (most recent call last):
sdx-controller-sdx-controller-1  |   File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2529, in wsgi_app
sdx-controller-sdx-controller-1  |     response = self.full_dispatch_request()
sdx-controller-sdx-controller-1  |   File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1825, in full_dispatch_request
sdx-controller-sdx-controller-1  |     rv = self.handle_user_exception(e)
sdx-controller-sdx-controller-1  |   File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1823, in full_dispatch_request
sdx-controller-sdx-controller-1  |     rv = self.dispatch_request()
sdx-controller-sdx-controller-1  |   File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1799, in dispatch_request
sdx-controller-sdx-controller-1  |     return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
sdx-controller-sdx-controller-1  |   File "/usr/local/lib/python3.9/site-packages/connexion/decorators/decorator.py", line 68, in wrapper
sdx-controller-sdx-controller-1  |     response = function(request)
sdx-controller-sdx-controller-1  |   File "/usr/local/lib/python3.9/site-packages/connexion/decorators/uri_parsing.py", line 149, in wrapper
sdx-controller-sdx-controller-1  |     response = function(request)
sdx-controller-sdx-controller-1  |   File "/usr/local/lib/python3.9/site-packages/connexion/decorators/validation.py", line 196, in wrapper
sdx-controller-sdx-controller-1  |     response = function(request)
sdx-controller-sdx-controller-1  |   File "/usr/local/lib/python3.9/site-packages/connexion/decorators/parameter.py", line 120, in wrapper
sdx-controller-sdx-controller-1  |     return function(**kwargs)
sdx-controller-sdx-controller-1  |   File "/usr/src/app/sdx_controller/controllers/connection_controller.py", line 70, in place_connection
sdx-controller-sdx-controller-1  |     reason, code = connection_handler.place_connection(current_app.te_manager, body)
sdx-controller-sdx-controller-1  |   File "/usr/src/app/sdx_controller/handlers/connection_handler.py", line 123, in place_connection
sdx-controller-sdx-controller-1  |     breakdown = te_manager.generate_connection_breakdown(solution)
sdx-controller-sdx-controller-1  |   File "/usr/local/lib/python3.9/site-packages/sdx_pce/topology/temanager.py", line 425, in generate_connection_breakdown
sdx-controller-sdx-controller-1  |     egress_port, next_ingress_port = self._get_ports_by_link(links[-1])
sdx-controller-sdx-controller-1  | TypeError: cannot unpack non-iterable NoneType object
sdx-controller-sdx-controller-1  | INFO:     174.170.111.107:43394 - "POST /SDX-Controller/1.0.0/connection HTTP/1.1" 500 Internal Server Error