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Improved cable tracing

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This commit is contained in:
Jeremy Stretch
2018-10-25 10:43:34 -04:00
parent 35f80f5085
commit e79a156e1f
2 changed files with 38 additions and 33 deletions
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58
netbox/dcim/models.py
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@@ -2377,44 +2377,44 @@ class Cable(ChangeLoggedModel):
Traverse both ends of a cable path and return its connected endpoints. Note that one or both endpoints may be
None.
"""
def trace_cable(termination, position=None):
def trace_cable(termination, position=1):
# Given a front port, follow the cable connected to the corresponding rear port/position
if isinstance(termination, FrontPanelPort):
rear_port = termination.rear_port
port_type = ContentType.objects.get_for_model(rear_port)
next_cable = Cable.objects.filter(
Q(termination_a_type=port_type, termination_a_id=rear_port.pk) |
Q(termination_b_type=port_type, termination_b_id=rear_port.pk)
).first()
if next_cable is None:
return None
if next_cable.termination_a == termination.rear_port:
return trace_cable(next_cable.termination_b, termination.rear_port_position)
else:
return trace_cable(next_cable.termination_a, termination.rear_port_position)
peer_port = termination.rear_port
position = termination.rear_port_position
# Given a rear port/position, follow the cable connected to the corresponding front port
if isinstance(termination, RearPanelPort):
if position is None:
raise Exception("Must specify a position when tracing a path from a rear panel port")
front_port = FrontPanelPort.objects.get(
elif isinstance(termination, RearPanelPort):
if position not in range(1, termination.positions + 1):
raise Exception("Invalid position for {} ({} positions): {})".format(
termination, termination.positions, position
))
peer_port = FrontPanelPort.objects.get(
rear_port=termination,
rear_port_position=position,
)
port_type = ContentType.objects.get_for_model(front_port)
next_cable = Cable.objects.filter(
Q(termination_a_type=port_type, termination_a_id=front_port.pk) |
Q(termination_b_type=port_type, termination_b_id=front_port.pk)
).first()
if next_cable is None:
return None
if next_cable.termination_a == front_port:
return trace_cable(next_cable.termination_b)
else:
return trace_cable(next_cable.termination_a)
position=1
# Termination is not a panel port, so we've reached the end of the path
return termination
else:
return termination
# Find the cable (if any) attached to the peer port
port_type = ContentType.objects.get_for_model(peer_port)
next_cable = Cable.objects.filter(
Q(termination_a_type=port_type, termination_a_id=peer_port.pk) |
Q(termination_b_type=port_type, termination_b_id=peer_port.pk)
).first()
# If no cable exists, return None
if next_cable is None:
return None
# Return the far side termination of the cable
if next_cable.termination_a == peer_port:
return trace_cable(next_cable.termination_b, position)
else:
return trace_cable(next_cable.termination_a, position)
return trace_cable(self.termination_a), trace_cable(self.termination_b)