#!/usr/bin/env python

from __future__ import print_function
import sys
import time
import optparse
from collections import defaultdict
import os
import subprocess

if False:
    from typing import Dict

states = {
    0: "OK",
    1: "WARNING",
    2: "CRITICAL",
    3: "UNKNOWN"
}

if 'USER' in os.environ and not os.environ['USER'] in ['root', 'rabbitmq']:
    print("This script must be run as the root or rabbitmq user")


usage = """Usage: check-rabbitmq-consumers --queue=[queue-name] --min-threshold=[min-threshold]"""

parser = optparse.OptionParser(usage=usage)
parser.add_option('--min-threshold',
                  dest='min_count',
                  type="int",
                  default=1,
                  action='store')

(options, args) = parser.parse_args()

output = subprocess.check_output(['/usr/sbin/rabbitmqctl', 'list_consumers'],
                                 universal_newlines=True)

consumers = defaultdict(int) # type: Dict[str, int]

sys.path.append(os.path.join(os.path.dirname(os.path.dirname(os.path.dirname(__file__)))))
from scripts.lib.zulip_tools import su_to_zulip
queues = {
    'digest_emails',
    'email_mirror',
    'embed_links',
    'error_reports',
    'feedback_messages',
    'invites',
    'message_sender',
    'missedmessage_emails',
    'missedmessage_email_senders',
    'missedmessage_mobile_notifications',
    'notify_tornado',
    'signups',
    'slow_queries',
    'tornado_return',
    'user_activity'
    'user_activity_interval',
    'user_presence',
}

for queue_name in queues:
    queue_name = queue_name.strip()
    consumers[queue_name] = 0

for line in output.split('\n'):
    parts = line.split('\t')
    if len(parts) >= 2:
        consumers[parts[0]] += 1

now = int(time.time())

for queue_name in consumers.keys():
    state_file_path = "/var/lib/nagios_state/check-rabbitmq-consumers-" + queue_name
    state_file_tmp = state_file_path + "-tmp"

    if consumers[queue_name] < options.min_count:
        status = 2
    else:
        status = 0
    with open(state_file_tmp, "w") as f:
        f.write("%s|%s|%s|queue %s has %s consumers, needs %s\n" % (
            now, status, states[status], queue_name,
            consumers[queue_name], options.min_count))
    subprocess.check_call(["mv", state_file_tmp, state_file_path])