def parse_uri(uri):
    """Extracts the host, port and db from an uri"""
    host, port, db = uri, 6379, 0
    if len(host.split('/')) == 2:
        host, db = host.split('/')
    if len(host.split(':')) == 2:
        host, port = host.split(':')
    return host, int(port), int(db)
