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###############################################################################
# Copyright (c) 2017 Koren Lev (Cisco Systems), Yaron Yogev (Cisco Systems) #
# and others #
# #
# All rights reserved. This program and the accompanying materials #
# are made available under the terms of the Apache License, Version 2.0 #
# which accompanies this distribution, and is available at #
# http://www.apache.org/licenses/LICENSE-2.0 #
###############################################################################
import re
from discover.fetchers.aci.aci_access import AciAccess, aci_config_required
from utils.inventory_mgr import InventoryMgr
from utils.util import decode_aci_dn, encode_aci_dn, get_object_path_part
# Fetches and adds to database:
# 1. ACI Switches with role "spine"
#
# Returns:
# 1. ACI Switch uplink pnics that belong to the "leaf" switch
# 2. ACI Switch downlink pnics that belong to "spine" switches mentioned above
# and are connected to the "leaf" switch
class AciFetchLeafToSpinePnics(AciAccess):
def __init__(self):
super().__init__()
self.inv = InventoryMgr()
def fetch_switches_by_role(self, role_name):
query_filter = "eq(fabricNode.role, \"{}\")".format(role_name)
switches = self.fetch_objects_by_class("fabricNode",
{"query-target-filter": query_filter})
return [switch["attributes"] for switch in switches]
def fetch_adjacent_connections(self, device_id):
dn = "/".join((device_id, "sys"))
response = self.fetch_mo_data(dn,
{"query-target": "subtree",
"target-subtree-class": "lldpAdjEp"})
connections = self.get_objects_by_field_names(response,
"lldpAdjEp", "attributes")
return connections
# Returns:
# List of:
# 1. Switches with role "spine"
# 2. Downlink pnic id for spine switch
# 3. Uplink pnic id for leaf switch
def fetch_spines_and_pnics_by_leaf_id(self, leaf_id):
spine_switches = self.fetch_switches_by_role("spine")
adjacent_devices = self.fetch_adjacent_connections(leaf_id)
spines = []
for spine in spine_switches:
# Check if spine switch is connected to current leaf switch
connection = next((d for d in adjacent_devices
if spine["name"] == d["sysName"]),
None)
if connection:
try:
# Extract pnics from adjacency data
uplink_pnic = re.match(".*\[(.+?)\].*", connection["dn"]).group(1)
downlink_pnic = re.match(".*\[(.+?)\].*", connection["portDesc"]).group(1)
spines.append({
"device": spine,
"downlink_pnic": downlink_pnic,
"uplink_pnic": uplink_pnic
})
except AttributeError:
continue # TODO: probably raise an exception
return spines
@aci_config_required(default=[])
def get(self, db_leaf_pnic_id):
environment = self.get_env()
pnic = self.inv.get_by_id(environment=environment, item_id=db_leaf_pnic_id)
# Decode aci leaf switch id from db format
aci_leaf_pnic_id = decode_aci_dn(db_leaf_pnic_id)
aci_leaf_id = re.match("switch-(.+?)-leaf", aci_leaf_pnic_id).group(1)
# Fetch all leaf-to-spine connectivity data
spines_with_pnics = self.fetch_spines_and_pnics_by_leaf_id(aci_leaf_id)
pnics = []
for spine_with_pnic in spines_with_pnics:
spine = spine_with_pnic["device"]
downlink_pnic_id = spine_with_pnic["downlink_pnic"]
uplink_pnic_id = spine_with_pnic["uplink_pnic"]
# Add spine switch to db if it's not there yet
spine_id_match = re.match("topology/(.+)", spine["dn"])
if not spine_id_match:
raise ValueError("Failed to fetch spine switch id from switch dn: {}"
.format(spine["dn"]))
aci_spine_id = spine_id_match.group(1)
db_spine_id = "-".join(("switch", encode_aci_dn(aci_spine_id), spine["role"]))
if not self.inv.get_by_id(environment, db_spine_id):
spine_json = {
"id": db_spine_id,
"type": "switch",
"host": db_spine_id,
"aci_document": spine
}
# Region name is the same as region id
region_id = get_object_path_part(pnic["name_path"], "Regions")
region = self.inv.get_by_id(environment, region_id)
self.inv.save_inventory_object(o=spine_json, parent=region, environment=environment)
# Add downlink and uplink pnics to results list,
# including their mutual connection data
# (see "connected_to" field).
db_downlink_pnic_id = "-".join((db_spine_id,
encode_aci_dn(downlink_pnic_id)))
db_uplink_pnic_id = "-".join((pnic["host"], # host == switch
encode_aci_dn(uplink_pnic_id)))
downlink_pnic_json = {
"id": db_downlink_pnic_id,
"type": "pnic",
"pnic_type": "switch",
"host": db_spine_id,
"connected_to": db_uplink_pnic_id,
"aci_document": {} # TODO: what can we add here?
}
uplink_pnic_json = {
"id": db_uplink_pnic_id,
"type": "pnic",
"pnic_type": "switch",
"host": pnic["host"],
"connected_to": db_downlink_pnic_id,
"aci_document": {} # TODO: what can we add here?
}
pnics.extend([downlink_pnic_json, uplink_pnic_json])
return pnics
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