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# pylint:disable=C0111
import os

import maxminddb.reader

try:
    import maxminddb.extension
except ImportError:
    maxminddb.extension = None

from maxminddb.const import (
    MODE_AUTO,
    MODE_MMAP,
    MODE_MMAP_EXT,
    MODE_FILE,
    MODE_MEMORY,
    MODE_FD,
)
from maxminddb.decoder import InvalidDatabaseError


def open_database(database, mode=MODE_AUTO):
    """Open a Maxmind DB database

    Arguments:
        database -- A path to a valid MaxMind DB file such as a GeoIP2 database
                    file, or a file descriptor in the case of MODE_FD.
        mode -- mode to open the database with. Valid mode are:
            * MODE_MMAP_EXT - use the C extension with memory map.
            * MODE_MMAP - read from memory map. Pure Python.
            * MODE_FILE - read database as standard file. Pure Python.
            * MODE_MEMORY - load database into memory. Pure Python.
            * MODE_FD - the param passed via database is a file descriptor, not
                        a path. This mode implies MODE_MEMORY.
            * MODE_AUTO - tries MODE_MMAP_EXT, MODE_MMAP, MODE_FILE in that
                          order. Default mode.
    """
    has_extension = maxminddb.extension and hasattr(maxminddb.extension, "Reader")
    if (mode == MODE_AUTO and has_extension) or mode == MODE_MMAP_EXT:
        if not has_extension:
            raise ValueError(
                "MODE_MMAP_EXT requires the maxminddb.extension module to be available"
            )
        return maxminddb.extension.Reader(database)
    if mode in (MODE_AUTO, MODE_MMAP, MODE_FILE, MODE_MEMORY, MODE_FD):
        return maxminddb.reader.Reader(database, mode)
    raise ValueError("Unsupported open mode: {0}".format(mode))


def Reader(database):  # pylint: disable=invalid-name
    """This exists for backwards compatibility. Use open_database instead"""
    return open_database(database)


__title__ = "maxminddb"
__version__ = "1.5.4"
__author__ = "Gregory Oschwald"
__license__ = "Apache License, Version 2.0"
__copyright__ = "Copyright 2013-2019 Maxmind, Inc."

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