import socket, os, json, time
from six.moves.urllib.parse import urlparse

COMMON_SITE_CONFIG_FILE = 'common_site_config.json'
REDIS_QUEUE_KEY = 'redis_queue'
REDIS_CACHE_KEY = 'redis_cache'
REDIS_SOCKETIO_KEY = 'redis_socketio'
DB_HOST_KEY = 'db_host'
DB_PORT = 3306

def is_open(ip, port, timeout=30):
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.settimeout(timeout)
    try:
        s.connect((ip, int(port)))
        s.shutdown(socket.SHUT_RDWR)
        return True
    except:
        return False
    finally:
        s.close()

def check_host(ip, port, retry=10, delay=3, print_attempt=True):
    ipup = False
    for i in range(retry):
        if print_attempt:
            print("Attempt {i} to connect to {ip}:{port}".format(ip=ip,port=port,i=i+1))
        if is_open(ip, port):
            ipup = True
            break
        else:
            time.sleep(delay)
    return ipup

# Check connection to servers
def get_config():
    config = None
    try:
        with open(COMMON_SITE_CONFIG_FILE) as config_file:
            config = json.load(config_file)
    except FileNotFoundError as exception:
        print(exception)
        exit(1)
    except:
        print(COMMON_SITE_CONFIG_FILE+" is not valid")
        exit(1)
    return config

# Check mariadb
def check_mariadb(retry=10, delay=3, print_attempt=True):
    config = get_config()
    check_mariadb = False
    check_mariadb = check_host(
        config.get(DB_HOST_KEY, 'mariadb'),
        DB_PORT,
        retry,
        delay,
        print_attempt)
    if not check_mariadb:
        print("Connection to MariaDB timed out")
        exit(1)

# Check redis queue
def check_redis_queue(retry=10, delay=3, print_attempt=True):
    check_redis_queue = False
    config = get_config()
    redis_queue_url = urlparse(config.get(REDIS_QUEUE_KEY,"redis://redis-queue:6379")).netloc
    redis_queue, redis_queue_port = redis_queue_url.split(":")
    check_redis_queue = check_host(
        redis_queue,
        redis_queue_port,
        retry,
        delay,
        print_attempt)
    if not check_redis_queue:
        print("Connection to redis queue timed out")
        exit(1)

# Check redis cache
def check_redis_cache(retry=10, delay=3, print_attempt=True):
    check_redis_cache = False
    config = get_config()
    redis_cache_url = urlparse(config.get(REDIS_CACHE_KEY,"redis://redis-cache:6379")).netloc
    redis_cache, redis_cache_port = redis_cache_url.split(":")
    check_redis_cache = check_host(
        redis_cache,
        redis_cache_port,
        retry,
        delay,
        print_attempt)
    if not check_redis_cache:
        print("Connection to redis cache timed out")
        exit(1)

# Check redis socketio
def check_redis_socketio(retry=10, delay=3, print_attempt=True):
    check_redis_socketio = False
    config = get_config()
    redis_socketio_url = urlparse(config.get(REDIS_SOCKETIO_KEY,"redis://redis-socketio:6379")).netloc
    redis_socketio, redis_socketio_port = redis_socketio_url.split(":")
    check_redis_socketio = check_host(
        redis_socketio,
        redis_socketio_port,
        retry,
        delay,
        print_attempt)
    if not check_redis_socketio:
        print("Connection to redis socketio timed out")
        exit(1)

# Get site_config.json
def get_site_config(site_name):
    site_config = None
    with open('{site_name}/site_config.json'.format(site_name=site_name)) as site_config_file:
        site_config = json.load(site_config_file)
    return site_config

def main():
    check_mariadb()
    check_redis_queue()
    check_redis_cache()
    check_redis_socketio()
    print('Connections OK')

if __name__ == "__main__":
    main()