# Copyright (C) 2012-2014 Bastian Kleineidam
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""
Memory utilities.
"""
import gc
import pprint
from . import strformat, log, LOG_CHECK
from .fileutil import get_temp_file

# Message to display when meliae package is not installed
MemoryDebugMsg = strformat.format_feature_warning(
    module='meliae', feature='memory debugging', url='https://launchpad.net/meliae'
)


def write_memory_dump():
    """Dump memory to a temporary filename with the meliae package.

    @return: JSON filename where memory dump has been written to
    @rtype: string
    """
    # first do a full garbage collection run
    gc.collect()
    if gc.garbage:
        log.warn(LOG_CHECK, "Unreachabe objects: %s", pprint.pformat(gc.garbage))
    from meliae import scanner

    fo, filename = get_temp_file(mode='wb', suffix='.json', prefix='lcdump_')
    try:
        scanner.dump_all_objects(fo)
    finally:
        fo.close()
    return filename