dn42-scripts/bird.py

#!/usr/bin/env python

import sys
import time
import re

import pprint

BIRD_REGEXP = r"(.*) \[(.*)] \*? ?\((.*)\) \[(.*)\]"

def parse_bird(stream):
    """Should take the output of "birdc 'show route primary'" as input.
    Returns a dictionary with all the information."""
    d = dict()
    for l in stream.readlines()[1:]:
        #l = l.translate(l.maketrans("", "",'()[]*'))
        data = re.match(BIRD_REGEXP, l.strip())
        try:
            data = data.groups()
            prefix = data[0].split()[0]
            d[prefix] = {
                "nexthop": data[0].split()[2],
                "iface": data[0].split()[4],
                "bgp_peer": data[1].split()[0],
                "up_since": data[1].split()[1],
                "localpref": int(data[2]),
                "origin_as": int(data[3][2:-1]),
                "last_updated": int(time.time()),
                "current": True,
            }
        except Exception as e:
            print("Unable to parse line '{}' : {}".format(l, e))
    return d

def update(db, new):
    """Modify db in place, updating it to reflect the new data from bird."""
    for prefix in db:
        db[prefix]["current"] = False
    for prefix in new:
        new[prefix]["first_seen"] = db[prefix]["first_seen"] if prefix in db and "first_seen" in db[prefix] and isinstance(db[prefix]["first_seen"], int) else int(time.time())
    db.update(new)

if __name__ == '__main__':
    pprint.pprint(parse_bird(sys.stdin))