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-rw-r--r--app/discover/fetchers/aci/aci_fetch_leaf_to_spine_pnics.py141
1 files changed, 141 insertions, 0 deletions
diff --git a/app/discover/fetchers/aci/aci_fetch_leaf_to_spine_pnics.py b/app/discover/fetchers/aci/aci_fetch_leaf_to_spine_pnics.py
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+++ b/app/discover/fetchers/aci/aci_fetch_leaf_to_spine_pnics.py
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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