def get_amount_of_wal_files()

in postgresql_metrics/localhost_postgres_stats.py [0:0]

• 13 lines of code
• 7 McCabe index (conditional complexity)

def get_amount_of_wal_files(data_dir):
    amount_of_wal_files = 0
    try:
        if data_dir and os.path.isdir(data_dir):
            wal_dir = os.path.join(data_dir, 'pg_wal')
            if not os.path.isdir(wal_dir):
                wal_dir = os.path.join(data_dir, 'pg_xlog')

            # each WAL file is named as 24-character hexadecimal number
            for possible_wal_file_name in os.listdir(wal_dir):
                if re.match('^[0-9A-F]{24}$', possible_wal_file_name):
                    amount_of_wal_files += 1
    except OSError:
        LOG.exception('Failed accessing WAL files. Is data dir readable by user?')
    return amount_of_wal_files