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73 lines
3.3 KiB
Python
73 lines
3.3 KiB
Python
from __future__ import unicode_literals
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from django.db.models import QuerySet
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from django.db.models.expressions import RawSQL
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from .constants import IFACE_ORDERING_NAME, IFACE_ORDERING_POSITION, NONCONNECTABLE_IFACE_TYPES
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class InterfaceQuerySet(QuerySet):
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def order_naturally(self, method=IFACE_ORDERING_POSITION):
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"""
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Naturally order interfaces by their type and numeric position. The sort method must be one of the defined
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IFACE_ORDERING_CHOICES (typically indicated by a parent Device's DeviceType).
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To order interfaces naturally, the `name` field is split into six distinct components: leading text (type),
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slot, subslot, position, channel, and virtual circuit:
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{type}{slot}/{subslot}/{position}/{subposition}:{channel}.{vc}
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Components absent from the interface name are ignored. For example, an interface named GigabitEthernet1/2/3
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would be parsed as follows:
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name = 'GigabitEthernet'
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slot = 1
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subslot = 2
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position = 3
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subposition = 0
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channel = None
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vc = 0
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The original `name` field is taken as a whole to serve as a fallback in the event interfaces do not match any of
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the prescribed fields.
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"""
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sql_col = '{}.name'.format(self.model._meta.db_table)
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ordering = {
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IFACE_ORDERING_POSITION: (
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'_slot', '_subslot', '_position', '_subposition', '_channel', '_type', '_vc', '_id', 'name',
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),
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IFACE_ORDERING_NAME: (
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'_type', '_slot', '_subslot', '_position', '_subposition', '_channel', '_vc', '_id', 'name',
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),
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}[method]
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TYPE_RE = r"SUBSTRING({} FROM '^([^0-9]+)')"
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ID_RE = r"CAST(SUBSTRING({} FROM '^(?:[^0-9]+)(\d{{1,9}})$') AS integer)"
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SLOT_RE = r"CAST(SUBSTRING({} FROM '^(?:[^0-9]+)?(\d{{1,9}})\/') AS integer)"
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SUBSLOT_RE = r"COALESCE(CAST(SUBSTRING({} FROM '^(?:[^0-9]+)?(?:\d{{1,9}}\/)(\d{{1,9}})') AS integer), 0)"
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POSITION_RE = r"COALESCE(CAST(SUBSTRING({} FROM '^(?:[^0-9]+)?(?:\d{{1,9}}\/){{2}}(\d{{1,9}})') AS integer), 0)"
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SUBPOSITION_RE = r"COALESCE(CAST(SUBSTRING({} FROM '^(?:[^0-9]+)?(?:\d{{1,9}}\/){{3}}(\d{{1,9}})') AS integer), 0)"
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CHANNEL_RE = r"COALESCE(CAST(SUBSTRING({} FROM ':(\d{{1,9}})(\.\d{{1,9}})?$') AS integer), 0)"
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VC_RE = r"COALESCE(CAST(SUBSTRING({} FROM '\.(\d{{1,9}})$') AS integer), 0)"
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fields = {
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'_type': RawSQL(TYPE_RE.format(sql_col), []),
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'_id': RawSQL(ID_RE.format(sql_col), []),
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'_slot': RawSQL(SLOT_RE.format(sql_col), []),
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'_subslot': RawSQL(SUBSLOT_RE.format(sql_col), []),
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'_position': RawSQL(POSITION_RE.format(sql_col), []),
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'_subposition': RawSQL(SUBPOSITION_RE.format(sql_col), []),
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'_channel': RawSQL(CHANNEL_RE.format(sql_col), []),
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'_vc': RawSQL(VC_RE.format(sql_col), []),
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}
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return self.annotate(**fields).order_by(*ordering)
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def connectable(self):
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"""
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Return only physical interfaces which are capable of being connected to other interfaces (i.e. not virtual or
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wireless).
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"""
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return self.exclude(form_factor__in=NONCONNECTABLE_IFACE_TYPES)
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