# Copyright (c) 2018 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.


"""This module implements initialization and cleanup of DPDK environment."""

from robot.api import logger

from resources.libraries.python.ssh import SSH, exec_cmd_no_error
from resources.libraries.python.Constants import Constants
from resources.libraries.python.topology import NodeType, Topology


class DPDKTools(object):
    """This class implements:
    - Initialization of DPDK environment,
    - Cleanup of DPDK environment.
    """

    @staticmethod
    def initialize_dpdk_environment(dut_node, dut_if1, dut_if2):
        """
        Initialize the DPDK test environment on the dut_node.
        Load the module uio and igb_uio, then bind the test NIC to the igb_uio.

        :param dut_node: Will init the DPDK on this node.
        :param dut_if1: DUT interface name.
        :param dut_if2: DUT interface name.
        :type dut_node: dict
        :type dut_if1: str
        :type dut_if2: str
        :raises RuntimeError: If it fails to bind the interfaces to igb_uio.
        """
        if dut_node['type'] == NodeType.DUT:
            pci_address1 = Topology.get_interface_pci_addr(dut_node, dut_if1)
            pci_address2 = Topology.get_interface_pci_addr(dut_node, dut_if2)

            ssh = SSH()
            ssh.connect(dut_node)

            arch = Topology.get_node_arch(dut_node)
            cmd = '{fwdir}/tests/dpdk/dpdk_scripts/init_dpdk.sh '\
                  '{pci1} {pci2} {arch}'.format(fwdir=Constants.REMOTE_FW_DIR,
                                                pci1=pci_address1,
                                                pci2=pci_address2,
                                                arch=arch)

            ret_code, _, _ = ssh.exec_command_sudo(cmd, timeout=600)
            if ret_code != 0:
                raise RuntimeError('Failed to bind the interfaces to igb_uio '
                                   'at node {name}'.\
                                    format(name=dut_node['host']))

    @staticmethod
    def cleanup_dpdk_environment(dut_node, dut_if1, dut_if2):
        """
        Cleanup the DPDK test environment on the DUT node.
        Unbind the NIC from the igb_uio and bind them to the kernel driver.

        :param dut_node: Will cleanup the DPDK on this node.
        :param dut_if1: DUT interface name.
        :param dut_if2: DUT interface name.
        :type dut_node: dict
        :type dut_if1: str
        :type dut_if2: str
        :raises RuntimeError: If it fails to cleanup the dpdk.
        """
        if dut_node['type'] == NodeType.DUT:
            pci_address1 = Topology.get_interface_pci_addr(dut_node, dut_if1)
            if1_driver = Topology.get_interface_driver(dut_node, dut_if1)
            pci_address2 = Topology.get_interface_pci_addr(dut_node, dut_if2)
            if2_driver = Topology.get_interface_driver(dut_node, dut_if2)

            ssh = SSH()
            ssh.connect(dut_node)

            cmd = '{fwdir}/tests/dpdk/dpdk_scripts/cleanup_dpdk.sh ' \
                  '{drv1} {pci1} {drv2} {pci2}'.\
                  format(fwdir=Constants.REMOTE_FW_DIR, drv1=if1_driver,
                         pci1=pci_address1, drv2=if2_driver, pci2=pci_address2)

            ret_code, _, _ = ssh.exec_command_sudo(cmd, timeout=600)
            if ret_code != 0:
                raise RuntimeError('Failed to cleanup the dpdk at node {name}'.
                                   format(name=dut_node['host']))

    @staticmethod
    def install_dpdk_test(node):
        """
        Prepare the DPDK test environment

        :param node: Dictionary created from topology
        :type node: dict
        :returns: nothing
        :raises RuntimeError: If command returns nonzero return code.
        """
        arch = Topology.get_node_arch(node)

        command = ('{fwdir}/tests/dpdk/dpdk_scripts/install_dpdk.sh {arch}'.
                   format(fwdir=Constants.REMOTE_FW_DIR, arch=arch))
        message = 'Install the DPDK failed!'
        exec_cmd_no_error(node, command, timeout=600, message=message)

        command = ('cat {fwdir}/download_dir/dpdk*/VERSION'.
                   format(fwdir=Constants.REMOTE_FW_DIR))
        message = 'Get DPDK version failed!'
        stdout, _ = exec_cmd_no_error(node, command, message=message)

        logger.info('DPDK Version: {version}'.format(version=stdout))

    @staticmethod
    def install_dpdk_test_on_all_duts(nodes):
        """
        Prepare the DPDK test environment on all DUTs.

        :param nodes: Nodes from topology file.
        :type nodes: dict
        :returns: nothing
        """
        for node in nodes.values():
            if node['type'] == NodeType.DUT:
                DPDKTools.install_dpdk_test(node)