#
#  Copyright (C) 2019 Intel Corporation.
#  All rights reserved.
#
#  Redistribution and use in source and binary forms, with or without
#  modification, are permitted provided that the following conditions are met:
#  1. Redistributions of source code must retain the above copyright notice(s),
#     this list of conditions and the following disclaimer.
#  2. Redistributions in binary form must reproduce the above copyright notice(s),
#     this list of conditions and the following disclaimer in the documentation
#     and/or other materials provided with the distribution.
#
#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY EXPRESS
#  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
#  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
#  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
#  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
#  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
#  OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
from distutils.spawn import find_executable
from python_framework import CMD_helper
import os

class Test_dax_kmem_env_var(object):
    os.environ["PATH"] += os.pathsep + os.path.dirname(os.path.dirname(__file__))
    binary_path = find_executable("memkind-auto-dax-kmem-nodes")
    environ_err_test = "../environ_err_dax_kmem_malloc_test"
    environ_err_positive_test = "../environ_err_dax_kmem_malloc_positive_test"
    expected_libnuma_warning = "libnuma: Warning: node argument -1 is out of range\n\n"
    fail_msg = "Test failed with:\n {0}"
    cmd_helper = CMD_helper()

    def get_dax_kmem_nodes(self, nodemask=None):
        """ This function executes memkind function 'get_mbind_nodemask' and returns its output - comma-separated DAX_KMEM nodes """
        command = self.binary_path
        if (nodemask):
            command = "MEMKIND_DAX_KMEM_NODES={}".format(nodemask) + command
        output, retcode = self.cmd_helper.execute_cmd(command)
        assert retcode == 0, self.fail_msg.format("\nError: Execution of \'{0}\' returns {1}, \noutput: {2}".format(command, retcode, output))
        print("\nExecution of {} returns output {}".format(command, output))
        return output

    def test_TC_MEMKIND_dax_kmem_env_var_compare_nodemask_default_and_env_variable(self):
        """ This test checks whether dax_kmem_nodemask_default and dax_kmem_nodemask_env_variable have the same value """
        dax_kmem_nodemask_default = self.get_dax_kmem_nodes()
        dax_kmem_nodemask_env_variable = self.get_dax_kmem_nodes(dax_kmem_nodemask_default)
        assert dax_kmem_nodemask_default == dax_kmem_nodemask_env_variable, self.fail_msg.format("Error: Nodemask dax_kmem_nodemask_default ({0}) " \
               "is not the same as nodemask dax_kmem_nodemask_env_variable ({1})".format(dax_kmem_nodemask_default, dax_kmem_nodemask_env_variable))

    def test_TC_MEMKIND_dax_kmem_env_var_negative_memkind_malloc(self):
        """ This test sets usupported value of MEMKIND_DAX_KMEM_NODES, then tries to perform a successful allocation from DRAM using memkind_malloc() """
        command = "MEMKIND_DAX_KMEM_NODES=-1 " + self.cmd_helper.get_command_path(self.environ_err_test)
        output, retcode = self.cmd_helper.execute_cmd(command)
        assert retcode != 0, self.fail_msg.format("\nError: Execution of: \'{0}\' returns: {1} \noutput: {2}".format(command, retcode, output))
        assert self.expected_libnuma_warning == output, self.fail_msg.format("Error: expected libnuma warning ({0}) " \
               "was not found (output: {1})").format(self.expected_libnuma_warning, output)

    def test_TC_MEMKIND_dax_kmem_env_var_proper_memkind_malloc(self):
        """ This test checks if allocation is performed on persistent memory correctly """
        dax_kmem_nodemask_default = self.get_dax_kmem_nodes().strip()
        command = "MEMKIND_DAX_KMEM_NODES={} ".format(dax_kmem_nodemask_default) + self.cmd_helper.get_command_path(self.environ_err_positive_test)
        output, retcode = self.cmd_helper.execute_cmd(command)
        assert retcode == 0, self.fail_msg.format("\nError: Execution of: \'{0}\' returns: {1} \noutput: {2}".format(command, retcode, output))