b3c629264a
Semantically, all the implemented error handling for the try-except- blocks around calls to "maybe_node_by_mac()" or "maybe_node_by_id()" in nodedb.py only handle the case that a particular MAC address cannot be found in the list of known nodes. If such a MAC address cannot be found in this list, the methods properly indicate this by raising a KeyError. However, all the try-except-block generically catch all exceptions and thus may cover other problems. But not only that problems might be covered by this, generic try-except-blocks make finding errors and de- bugging quite painful. Hence, these try-except-blocks should only catch KeyErrors or at least have an error handling that differs from other exceptions.
252 lines
6.5 KiB
Python
252 lines
6.5 KiB
Python
import json
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from functools import reduce
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from collections import defaultdict
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from node import Node, Interface
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from link import Link, LinkConnector
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class NodeDB:
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def __init__(self, time=0):
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self.time = time
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self._nodes = []
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self._links = []
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# fetch list of links
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def get_links(self):
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self.update_vpn_links()
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return self.reduce_links()
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# fetch list of nodes
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def get_nodes(self):
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return self._nodes
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# remove all offlines nodes with lastseen < timestamp
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def prune_offline(self, timestamp):
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self._nodes = list(filter(lambda x: x.lastseen >= timestamp, self._nodes))
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# write persistent state to file
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def dump_state(self, filename):
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obj = []
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for node in self._nodes:
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obj.append({ 'id': node.id
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, 'name': node.name
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, 'lastseen': node.lastseen
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, 'firstseen': node.firstseen
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, 'geo': node.gps
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})
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with open(filename, "w") as f:
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json.dump(obj, f)
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# load persistent state from file
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def load_state(self, filename):
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try:
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with open(filename, "r") as f:
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obj = json.load(f)
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for n in obj:
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try:
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node = self.maybe_node_by_id(n['id'])
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except KeyError:
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node = Node()
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node.id = n['id']
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node.name = n['name']
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node.lastseen = n['lastseen']
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node.gps = n['geo']
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self._nodes.append(node)
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if 'firstseen' in n:
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node.firstseen = n['firstseen']
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except:
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pass
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def maybe_node_by_mac(self, macs):
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for node in self._nodes:
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for mac in macs:
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if mac.lower() in node.macs:
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return node
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raise KeyError
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def maybe_node_by_id(self, mac):
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for node in self._nodes:
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if mac.lower() == node.id:
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return node
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raise KeyError
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def parse_vis_data(self,vis_data):
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for x in vis_data:
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if 'of' in x:
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try:
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node = self.maybe_node_by_mac((x['of'], x['secondary']))
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except KeyError:
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node = Node()
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node.lastseen = self.time
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node.firstseen = self.time
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node.flags['online'] = True
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self._nodes.append(node)
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node.add_mac(x['of'])
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node.add_mac(x['secondary'])
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for x in vis_data:
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if 'router' in x:
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# TTs will be processed later
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if x['label'] == "TT":
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continue
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try:
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node = self.maybe_node_by_mac((x['router'], ))
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except KeyError:
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node = Node()
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node.lastseen = self.time
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node.firstseen = self.time
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node.flags['online'] = True
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node.add_mac(x['router'])
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self._nodes.append(node)
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try:
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if 'neighbor' in x:
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try:
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node = self.maybe_node_by_mac((x['neighbor'], ))
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except KeyError:
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continue
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if 'gateway' in x:
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x['neighbor'] = x['gateway']
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node = self.maybe_node_by_mac((x['neighbor'], ))
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except KeyError:
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node = Node()
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node.lastseen = self.time
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node.firstseen = self.time
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node.flags['online'] = True
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node.add_mac(x['neighbor'])
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self._nodes.append(node)
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for x in vis_data:
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if 'router' in x:
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# TTs will be processed later
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if x['label'] == "TT":
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continue
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try:
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if 'gateway' in x:
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x['neighbor'] = x['gateway']
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router = self.maybe_node_by_mac((x['router'], ))
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neighbor = self.maybe_node_by_mac((x['neighbor'], ))
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except KeyError:
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continue
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# filter TT links merged in previous step
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if router == neighbor:
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continue
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link = Link()
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link.source = LinkConnector()
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link.source.interface = x['router']
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link.source.id = self._nodes.index(router)
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link.target = LinkConnector()
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link.target.interface = x['neighbor']
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link.target.id = self._nodes.index(neighbor)
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link.quality = x['label']
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link.id = "-".join(sorted((link.source.interface, link.target.interface)))
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self._links.append(link)
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for x in vis_data:
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if 'primary' in x:
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try:
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node = self.maybe_node_by_mac((x['primary'], ))
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except KeyError:
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continue
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node.id = x['primary']
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for x in vis_data:
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if 'router' in x and x['label'] == 'TT':
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try:
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node = self.maybe_node_by_mac((x['router'], ))
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node.add_mac(x['gateway'])
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node.clientcount += 1
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except KeyError:
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pass
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# don't count node as its own client
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for node in self._nodes:
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if node.clientcount > 0:
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node.clientcount -= 1
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def reduce_links(self):
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tmp_links = defaultdict(list)
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for link in self._links:
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tmp_links[link.id].append(link)
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links = []
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def reduce_link(a, b):
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a.id = b.id
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a.source = b.source
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a.target = b.target
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a.type = b.type
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a.quality = ", ".join([x for x in (a.quality, b.quality) if x])
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return a
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for k, v in tmp_links.items():
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new_link = reduce(reduce_link, v, Link())
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links.append(new_link)
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return links
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def import_aliases(self, aliases):
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for mac, alias in aliases.items():
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try:
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node = self.maybe_node_by_mac([mac])
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except KeyError:
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# create an offline node
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node = Node()
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node.add_mac(mac)
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self._nodes.append(node)
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if 'name' in alias:
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node.name = alias['name']
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if 'vpn' in alias and alias['vpn'] and mac and node.interfaces and mac in node.interfaces:
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node.interfaces[mac].vpn = True
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if 'gps' in alias:
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node.gps = alias['gps']
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if 'firmware' in alias:
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node.firmware = alias['firmware']
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if 'id' in alias:
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node.id = alias['id']
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def mark_gateway(self, gateway):
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try:
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node = self.maybe_node_by_mac((gateway, ))
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node.flags['gateway'] = True
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except KeyError:
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print("WARNING: did not find gateway ", gateway, " in node list")
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def update_vpn_links(self):
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changes = 1
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while changes > 0:
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changes = 0
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for link in self._links:
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source_interface = self._nodes[link.source.id].interfaces[link.source.interface]
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target_interface = self._nodes[link.target.id].interfaces[link.target.interface]
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if source_interface.vpn or target_interface.vpn:
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source_interface.vpn = True
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target_interface.vpn = True
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if link.type != "vpn":
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changes += 1
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link.type = "vpn"
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