from django.conf import settings

from zerver.models import Realm
import json
import os
shard_map = {}
if os.path.exists("/etc/zulip/sharding.json"):
    with open("/etc/zulip/sharding.json") as f:
        shard_map = json.loads(f.read())

def get_tornado_port(realm: Realm) -> int:
    if settings.TORNADO_SERVER is None:
        return 9993
    if settings.TORNADO_PROCESSES == 1:
        return int(settings.TORNADO_SERVER.split(":")[-1])
    return shard_map.get(realm.host, 9800)

def get_tornado_uri(realm: Realm) -> str:
    if settings.TORNADO_PROCESSES == 1:
        return settings.TORNADO_SERVER

    port = get_tornado_port(realm)
    return "http://127.0.0.1:%d" % (port,)

def notify_tornado_queue_name(port: int) -> str:
    if settings.TORNADO_PROCESSES == 1:
        return "notify_tornado"
    return "notify_tornado_port_%d" % (port,)