#!/usr/bin/env python
from __future__ import print_function
import os
import sys
import pwd
import subprocess
import logging
import time

sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
from scripts.lib.zulip_tools import ENDC, OKGREEN, DEPLOYMENTS_DIR

logging.basicConfig(format="%(asctime)s restart-server: %(message)s",
                    level=logging.INFO)

deploy_path = os.path.realpath(os.path.join(os.path.dirname(__file__), '..'))
os.chdir(deploy_path)

if pwd.getpwuid(os.getuid()).pw_name != "zulip":
    logging.error("Must be run as user 'zulip'.")
    sys.exit(1)

# Send a statsd event on restarting the server
subprocess.check_call(["python", "./manage.py", "send_stats", "incr", "events.server_restart", str(int(time.time()))])

logging.info("Filling memcached caches")
subprocess.check_call(["python", "./manage.py", "fill_memcached_caches"])

# Restart the FastCGI and related processes via supervisorctl.
logging.info("Stopping workers")
subprocess.check_call(["supervisorctl", "stop", "zulip-workers:*"])
logging.info("Stopping server core")
subprocess.check_call(["supervisorctl", "stop", "zulip-senders:* zulip-django zulip-tornado"])

current_symlink = os.path.join(DEPLOYMENTS_DIR, "current")
last_symlink = os.path.join(DEPLOYMENTS_DIR, "last")
if os.readlink(current_symlink) != deploy_path:
    subprocess.check_call(["ln", '-nsf', os.readlink(current_symlink), last_symlink])
    subprocess.check_call(["ln", '-nsf', deploy_path, current_symlink])
logging.info("Starting server core")
subprocess.check_call(["supervisorctl", "start", "zulip-tornado zulip-django zulip-senders:*"])
logging.info("Starting workers")
subprocess.check_call(["supervisorctl", "start", "zulip-workers:*"])

using_sso = subprocess.check_output(['./scripts/get-django-setting', 'USING_APACHE_SSO'])
if using_sso.strip() == b'True':
    logging.info("Restarting Apache WSGI process...")
    subprocess.check_call(["pkill", "-f", "apache2", "-u", "zulip"])

logging.info("Done!")
print(OKGREEN + "Application restarted successfully!" + ENDC)
