# Source code for M2Crypto.Err

    from __future__ import absolute_import

    """M2Crypto wrapper for OpenSSL Error API.

    Copyright (c) 1999-2003 Ng Pheng Siong. All rights reserved."""

    from M2Crypto import BIO, m2, util, six  # noqa
    from typing import Optional  # noqa

    def get_error():
        # type: () -> Optional[str]
        err = BIO.MemoryBuffer()
        m2.err_print_errors(err.bio_ptr())
        err_msg = err.read()
        if err_msg:
            return six.ensure_text(err_msg)

    def get_error_code():
        # type: () -> int
        return m2.err_get_error()

    def peek_error_code():
        # type: () -> int
        return m2.err_peek_error()

    def get_error_lib(err):
        # type: (Optional[int]) -> str
        err_str = m2.err_lib_error_string(err)
        return six.ensure_text(err_str) if err_str else ''

    def get_error_func(err):
        # type: (Optional[int]) -> str
        err_str = m2.err_func_error_string(err)
        return six.ensure_text(err_str) if err_str else ''

    def get_error_reason(err):
        # type: (Optional[int]) -> str
        err_str = m2.err_reason_error_string(err)
        return six.ensure_text(err_str) if err_str else ''

    def get_error_message():
        # type: () -> str
        return six.ensure_text(get_error_reason(get_error_code()))

    def get_x509_verify_error(err):
        # type: (Optional[int]) -> str
        err_str = m2.x509_get_verify_error(err)
        return six.ensure_text(err_str) if err_str else ''

    class SSLError(Exception):
        def __init__(self, err, client_addr):
            # type: (int, util.AddrType) -> None
            self.err = err
            self.client_addr = client_addr

        def __str__(self):
            # type: () -> str
            if not isinstance(self.client_addr, six.text_type):
                s = self.client_addr.decode('utf8')
            else:
                s = self.client_addr
            return "%s: %s: %s" % (get_error_func(self.err), s,
                                   get_error_reason(self.err))

    class M2CryptoError(Exception):
        pass