#!/usr/bin/env python3

#####
#
# This script triggers Keepalived's dump-to-json function
# and prints most of the interesting info into a table.
#
# Author: Damien Clabaut <damien.clabaut@corp.ovh.com>
#
#####

import datetime
import json
import os
import sys
import time
from prettytable import PrettyTable

# Configuration
# Path to the keepalived json dump
keepalived_json_file = "/tmp/keepalived.json"

# Path to the keepalived PID file
keepalived_pid_file = "/var/run/keepalived.pid"


with open(keepalived_pid_file, "r") as f:
    keepalived_pid = int(f.read())

os.kill(keepalived_pid, 36)

try:
    time.sleep(0.5)
    keepalived_data = json.load(open(keepalived_json_file))
except Exception:
    sys.exit("Could not load json from file, please check that keepalived is running at a compatible version")

data_table = PrettyTable([
                          "Instance", "Interface", "Addresses", "Version",
                          "Priority", "Master prio", "State", "Last Transition"
                        ])
for instance in keepalived_data:
    if instance["data"]["state"] == 0:
        instance["data"]["state_cleartext"] = "Init"
    elif instance["data"]["state"] == 1:
        instance["data"]["state_cleartext"] = "Slave"
    elif instance["data"]["state"] == 2:
        instance["data"]["state_cleartext"] = "Master"
    else:
        instance["data"]["state_cleartext"] = "Fault"

    unicast_vips = []
    for vip in instance["data"]["vips"]:
        # We do not display link-local addresses as they are usually not relevant
        if not vip.startswith("fe80"):
            unicast_vips.append(vip)

    data_table.add_row([
                        int(instance["data"]["iname"]), instance["data"]["vmac_ifname"],
                        "\n".join(unicast_vips), instance["data"]["version"],
                        instance["data"]["effective_priority"], instance["data"]["master_priority"],
                        instance["data"]["state_cleartext"],
                        datetime.datetime.fromtimestamp(instance["data"]["last_transition"])
                      ])

print(data_table.get_string(sortby="Instance"))
