# 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.

"""Library to control Kubernetes kubectl."""

from time import sleep

from resources.libraries.python.constants import Constants
from resources.libraries.python.topology import NodeType
from resources.libraries.python.ssh import SSH, exec_cmd_no_error
from resources.libraries.python.CpuUtils import CpuUtils
from resources.libraries.python.VppConfigGenerator import VppConfigGenerator

__all__ = ["KubernetesUtils"]

# Maximum number of retries to check if PODs are running or deleted.
MAX_RETRY = 48

class KubernetesUtils(object):
    """Kubernetes utilities class."""

    def __init__(self):
        """Initialize KubernetesUtils class."""
        pass

    @staticmethod
    def load_docker_image_on_node(node, image_path):
        """Load Docker container image from file on node.

        :param node: DUT node.
        :param image_path: Container image path.
        :type node: dict
        :type image_path: str
        :raises RuntimeError: If loading image failed on node.
        """
        command = 'docker load -i {image_path}'.\
            format(image_path=image_path)
        message = 'Failed to load Docker image on {node}.'.\
            format(node=node['host'])
        exec_cmd_no_error(node, command, timeout=240, sudo=True,
                          message=message)

        command = "docker rmi $(sudo docker images -f 'dangling=true' -q)".\
            format(image_path=image_path)
        message = 'Failed to clean Docker images on {node}.'.\
            format(node=node['host'])
        try:
            exec_cmd_no_error(node, command, timeout=240, sudo=True,
                              message=message)
        except RuntimeError:
            pass

    @staticmethod
    def load_docker_image_on_all_duts(nodes, image_path):
        """Load Docker container image from file on all DUTs.

        :param nodes: Topology nodes.
        :param image_path: Container image path.
        :type nodes: dict
        :type image_path: str
        """
        for node in nodes.values():
            if node['type'] == NodeType.DUT:
                KubernetesUtils.load_docker_image_on_node(node, image_path)

    @staticmethod
    def setup_kubernetes_on_node(node):
        """Set up Kubernetes on node.

        :param node: DUT node.
        :type node: dict
        :raises RuntimeError: If Kubernetes setup failed on node.
        """
        ssh = SSH()
        ssh.connect(node)

        cmd = '{dir}/{lib}/k8s_setup.sh deploy_calico'\
            .format(dir=Constants.REMOTE_FW_DIR,
                    lib=Constants.RESOURCES_LIB_SH)
        (ret_code, _, _) = ssh.exec_command(cmd, timeout=240)
        if int(ret_code) != 0:
            raise RuntimeError('Failed to setup Kubernetes on {node}.'
                               .format(node=node['host']))

        KubernetesUtils.wait_for_kubernetes_pods_on_node(node,
                                                         nspace='kube-system')

    @staticmethod
    def setup_kubernetes_on_all_duts(nodes):
        """Set up Kubernetes on all DUTs.

        :param nodes: Topology nodes.
        :type nodes: dict
        """
        for node in nodes.values():
            if node['type'] == NodeType.DUT:
                KubernetesUtils.setup_kubernetes_on_node(node)

    @staticmethod
    def destroy_kubernetes_on_node(node):
        """Destroy Kubernetes on node.

        :param node: DUT node.
        :type node: dict
        :raises RuntimeError: If destroying Kubernetes failed.
        """
        ssh = SSH()
        ssh.connect(node)

        cmd = '{dir}/{lib}/k8s_setup.sh destroy'\
            .format(dir=Constants.REMOTE_FW_DIR,
                    lib=Constants.RESOURCES_LIB_SH)
        (ret_code, _, _) = ssh.exec_command(cmd, timeout=120)
        if int(ret_code) != 0:
            raise RuntimeError('Failed to destroy Kubernetes on {node}.'
                               .format(node=node['host']))

    @staticmethod
    def destroy_kubernetes_on_all_duts(nodes):
        """Destroy Kubernetes on all DUTs.

        :param nodes: Topology nodes.
        :type nodes: dict
        """
        for node in nodes.values():
            if node['type'] == NodeType.DUT:
                KubernetesUtils.destroy_kubernetes_on_node(node)

    @staticmethod
    def apply_kubernetes_resource_on_node(node, yaml_file, **kwargs):
        """Apply Kubernetes resource on node.

        :param node: DUT node.
        :param yaml_file: YAML configuration file.
        :param kwargs: Key-value pairs to replace in YAML template.
        :type node: dict
        :type yaml_file: str
        :type kwargs: dict
        :raises RuntimeError: If applying Kubernetes template failed.
        """
        ssh = SSH()
        ssh.connect(node)

        fqn_file = '{tpl}/{yaml}'.format(tpl=Constants.RESOURCES_TPL_K8S,
                                         yaml=yaml_file)
        with open(fqn_file, 'r') as src_file:
            stream = src_file.read()
            data = reduce(lambda a, kv: a.replace(*kv), kwargs.iteritems(),
                          stream)
            cmd = 'cat <<EOF | kubectl apply -f - \n{data}\nEOF'.format(
                data=data)
            (ret_code, _, _) = ssh.exec_command_sudo(cmd)
            if int(ret_code) != 0:
                raise RuntimeError('Failed to apply Kubernetes template {yaml} '
                                   'on {node}.'.format(yaml=yaml_file,
                                                       node=node['host']))

    @staticmethod
    def apply_kubernetes_resource_on_all_duts(nodes, yaml_file, **kwargs):
        """Apply Kubernetes resource on all DUTs.

        :param nodes: Topology nodes.
        :param yaml_file: YAML configuration file.
        :param kwargs: Key-value pairs to replace in YAML template.
        :type nodes: dict
        :type yaml_file: str
        :type kwargs: dict
        """
        for node in nodes.values():
            if node['type'] == NodeType.DUT:
                KubernetesUtils.apply_kubernetes_resource_on_node(node,
                                                                  yaml_file,
                                                                  **kwargs)

    @staticmethod
    def create_kubernetes_cm_from_file_on_node(node, nspace, name, **kwargs):
        """Create Kubernetes ConfigMap from file on node.

        :param node: DUT node.
        :param nspace: Kubernetes namespace.
        :param name: ConfigMap name.
        :param kwargs: Named parameters.
        :type node: dict
        :type nspace: str
        :type name: str
        :param kwargs: dict
        :raises RuntimeError: If creating Kubernetes ConfigMap failed.
        """
        ssh = SSH()
        ssh.connect(node)

        nspace = '-n {nspace}'.format(nspace=nspace) if nspace else ''

        from_file = '{0}'.format(' '.join('--from-file={0}={1} '\
            .format(key, kwargs[key]) for key in kwargs))

        cmd = 'kubectl create {nspace} configmap {name} {from_file}'\
            .format(nspace=nspace, name=name, from_file=from_file)
        (ret_code, _, _) = ssh.exec_command_sudo(cmd)
        if int(ret_code) != 0:
            raise RuntimeError('Failed to create Kubernetes ConfigMap '
                               'on {node}.'.format(node=node['host']))

    @staticmethod
    def create_kubernetes_cm_from_file_on_all_duts(nodes, nspace, name,
                                                   **kwargs):
        """Create Kubernetes ConfigMap from file on all DUTs.

        :param nodes: Topology nodes.
        :param nspace: Kubernetes namespace.
        :param name: ConfigMap name.
        :param kwargs: Named parameters.
        :type nodes: dict
        :type nspace: str
        :type name: str
        :param kwargs: dict
        """
        for node in nodes.values():
            if node['type'] == NodeType.DUT:
                KubernetesUtils.create_kubernetes_cm_from_file_on_node(node,
                                                                       nspace,
                                                                       name,
                                                                       **kwargs)

    @staticmethod
    def delete_kubernetes_resource_on_node(node, nspace, name=None,
                                           rtype='po,cm,deploy,rs,rc,svc'):
        """Delete Kubernetes resource on node.

        :param node: DUT node.
        :param nspace: Kubernetes namespace.
        :param rtype: Kubernetes resource type.
        :param name: Name of resource (Default: all).
        :type node: dict
        :type nspace: str
        :type rtype: str
        :type name: str
        :raises RuntimeError: If retrieving or deleting Kubernetes resource
            failed.
        """
        ssh = SSH()
        ssh.connect(node)

        name = '{name}'.format(name=name) if name else '--all'
        nspace = '-n {nspace}'.format(nspace=nspace) if nspace else ''

        cmd = 'kubectl delete {nspace} {rtype} {name}'\
            .format(nspace=nspace, rtype=rtype, name=name)
        (ret_code, _, _) = ssh.exec_command_sudo(cmd, timeout=120)
        if int(ret_code) != 0:
            raise RuntimeError('Failed to delete Kubernetes resources '
                               'on {node}.'.format(node=node['host']))

        cmd = 'kubectl get {nspace} pods --no-headers'\
            .format(nspace=nspace)
        for _ in range(MAX_RETRY):
            (ret_code, stdout, stderr) = ssh.exec_command_sudo(cmd)
            if int(ret_code) != 0:
                raise RuntimeError('Failed to retrieve Kubernetes resources on '
                                   '{node}.'.format(node=node['host']))
            if name == '--all':
                ready = False
                for line in stderr.splitlines():
                    if 'No resources found.' in line:
                        ready = True
                if ready:
                    break
            else:
                ready = False
                for line in stdout.splitlines():
                    try:
                        state = line.split()[1].split('/')
                        ready = True if 'Running' in line and\
                            state == state[::-1] else False
                        if not ready:
                            break
                    except (ValueError, IndexError):
                        ready = False
                if ready:
                    break
            sleep(5)
        else:
            raise RuntimeError('Failed to delete Kubernetes resources on '
                               '{node}.'.format(node=node['host']))

    @staticmethod
    def delete_kubernetes_resource_on_all_duts(nodes, nspace, name=None,
                                               rtype='po,cm,deploy,rs,rc,svc'):
        """Delete all Kubernetes resource on all DUTs.

        :param nodes: Topology nodes.
        :param nspace: Kubernetes namespace.
        :param rtype: Kubernetes resource type.
        :param name: Name of resource.
        :type nodes: dict
        :type nspace: str
        :type rtype: str
        :type name: str
        """
        for node in nodes.values():
            if node['type'] == NodeType.DUT:
                KubernetesUtils.delete_kubernetes_resource_on_node(node, nspace,
                                                                   name, rtype)

    @staticmethod
    def describe_kubernetes_resource_on_node(node, nspace):
        """Describe all Kubernetes PODs in namespace on node.

        :param node: DUT node.
        :param nspace: Kubernetes namespace.
        :type node: dict
        :type nspace: str
        """
        ssh = SSH()
        ssh.connect(node)

        nspace = '-n {nspace}'.format(nspace=nspace) if nspace else ''

        cmd = 'kubectl describe {nspace} all'.format(nspace=nspace)
        ssh.exec_command_sudo(cmd)

    @staticmethod
    def describe_kubernetes_resource_on_all_duts(nodes, nspace):
        """Describe all Kubernetes PODs in namespace on all DUTs.

        :param nodes: Topology nodes.
        :param nspace: Kubernetes namespace.
        :type nodes: dict
        :type nspace: str
        """
        for node in nodes.values():
            if node['type'] == NodeType.DUT:
                KubernetesUtils.describe_kubernetes_resource_on_node(node,
                                                                     nspace)

    @staticmethod
    def get_kubernetes_logs_on_node(node, nspace):
        """Get Kubernetes logs from all PODs in namespace on node.

        :param node: DUT node.
        :param nspace: Kubernetes namespace.
        :type node: dict
        :type nspace: str
        """
        ssh = SSH()
        ssh.connect(node)

        nspace = '-n {nspace}'.format(nspace=nspace) if nspace else ''

        cmd = "for p in $(kubectl get pods {nspace} -o jsonpath="\
            "'{{.items[*].metadata.name}}'); do echo $p; kubectl logs "\
            "{nspace} $p; done".format(nspace=nspace)
        ssh.exec_command(cmd)

        cmd = "kubectl exec {nspace} etcdv3 -- etcdctl --endpoints "\
            "\"localhost:22379\" get \"/\" --prefix=true".format(nspace=nspace)
        ssh.exec_command(cmd)

    @staticmethod
    def get_kubernetes_logs_on_all_duts(nodes, nspace):
        """Get Kubernetes logs from all PODs in namespace on all DUTs.

        :param nodes: Topology nodes.
        :param nspace: Kubernetes namespace.
        :type nodes: dict
        :type nspace: str
        """
        for node in nodes.values():
            if node['type'] == NodeType.DUT:
                KubernetesUtils.get_kubernetes_logs_on_node(node, nspace)

    @staticmethod
    def wait_for_kubernetes_pods_on_node(node, nspace):
        """Wait for Kubernetes PODs to become ready on node.

        :param node: DUT node.
        :param nspace: Kubernetes namespace.
        :type node: dict
        :type nspace: str
        :raises RuntimeError: If Kubernetes PODs are not in Running state.
        """
        ssh = SSH()
        ssh.connect(node)

        nspace = '-n {nspace}'.format(nspace=nspace) if nspace \
            else '--all-namespaces'

        cmd = 'kubectl get {nspace} pods --no-headers' \
            .format(nspace=nspace)
        for _ in range(MAX_RETRY):
            (ret_code, stdout, _) = ssh.exec_command_sudo(cmd)
            if int(ret_code) == 0:
                ready = False
                for line in stdout.splitlines():
                    try:
                        state = line.split()[1].split('/')
                        ready = True if 'Running' in line and \
                            state == state[::-1] else False
                        if not ready:
                            break
                    except (ValueError, IndexError):
                        ready = False
                if ready:
                    break
            sleep(5)
        else:
            raise RuntimeError('Kubernetes PODs are not running on {node}.'
                               .format(node=node['host']))

    @staticmethod
    def wait_for_kubernetes_pods_on_all_duts(nodes, nspace):
        """Wait for Kubernetes to become ready on all DUTs.

        :param nodes: Topology nodes.
        :param nspace: Kubernetes namespace.
        :type nodes: dict
        :type nspace: str
        """
        for node in nodes.values():
            if node['type'] == NodeType.DUT:
                KubernetesUtils.wait_for_kubernetes_pods_on_node(node, nspace)

    @staticmethod
    def set_kubernetes_pods_affinity_on_node(node):
        """Set affinity for all Kubernetes PODs except VPP on node.

        :param node: DUT node.
        :type node: dict
        """
        ssh = SSH()
        ssh.connect(node)

        cmd = '{dir}/{lib}/k8s_setup.sh affinity_non_vpp'\
            .format(dir=Constants.REMOTE_FW_DIR,
                    lib=Constants.RESOURCES_LIB_SH)
        ssh.exec_command(cmd)

    @staticmethod
    def set_kubernetes_pods_affinity_on_all_duts(nodes):
        """Set affinity for all Kubernetes PODs except VPP on all DUTs.

        :param nodes: Topology nodes.
        :type nodes: dict
        """
        for node in nodes.values():
            if node['type'] == NodeType.DUT:
                KubernetesUtils.set_kubernetes_pods_affinity_on_node(node)

    @staticmethod
    def create_kubernetes_vswitch_startup_config(**kwargs):
        """Create Kubernetes VSWITCH startup configuration.

        :param kwargs: Key-value pairs used to create configuration.
        :param kwargs: dict
        """
        smt_used = CpuUtils.is_smt_enabled(kwargs['node']['cpuinfo'])

        cpuset_cpus = \
            CpuUtils.cpu_slice_of_list_per_node(node=kwargs['node'],
                                                cpu_node=kwargs['cpu_node'],
                                                skip_cnt=2,
                                                cpu_cnt=kwargs['phy_cores'],
                                                smt_used=smt_used)
        cpuset_main = \
            CpuUtils.cpu_slice_of_list_per_node(node=kwargs['node'],
                                                cpu_node=kwargs['cpu_node'],
                                                skip_cnt=1,
                                                cpu_cnt=1,
                                                smt_used=smt_used)

        # Create config instance
        vpp_config = VppConfigGenerator()
        vpp_config.set_node(kwargs['node'])
        vpp_config.add_unix_cli_listen(value='0.0.0.0:5002')
        vpp_config.add_unix_nodaemon()
        vpp_config.add_dpdk_socketmem('1024,1024')
        vpp_config.add_heapsize('4G')
        vpp_config.add_ip_heap_size('4G')
        vpp_config.add_ip6_heap_size('4G')
        vpp_config.add_ip6_hash_buckets('2000000')
        if not kwargs['jumbo']:
            vpp_config.add_dpdk_no_multi_seg()
        vpp_config.add_dpdk_no_tx_checksum_offload()
        vpp_config.add_dpdk_dev_default_rxq(kwargs['rxq_count_int'])
        vpp_config.add_dpdk_dev(kwargs['if1'], kwargs['if2'])
        vpp_config.add_dpdk_num_mbufs(kwargs['num_mbufs_int'])
        # We will pop first core from list to be main core
        vpp_config.add_cpu_main_core(str(cpuset_main.pop(0)))
        # if this is not only core in list, the rest will be used as workers.
        if cpuset_cpus:
            corelist_workers = ','.join(str(cpu) for cpu in cpuset_cpus)
            vpp_config.add_cpu_corelist_workers(corelist_workers)
        vpp_config.apply_config(filename=kwargs['filename'], restart_vpp=False)

    @staticmethod
    def create_kubernetes_vnf_startup_config(**kwargs):
        """Create Kubernetes VNF startup configuration.

        :param kwargs: Key-value pairs used to create configuration.
        :param kwargs: dict
        """
        smt_used = CpuUtils.is_smt_enabled(kwargs['node']['cpuinfo'])
        skip_cnt = kwargs['cpu_skip'] + (kwargs['i'] - 1) * \
            (kwargs['phy_cores'] - 1)
        cpuset_cpus = \
            CpuUtils.cpu_slice_of_list_per_node(node=kwargs['node'],
                                                cpu_node=kwargs['cpu_node'],
                                                skip_cnt=skip_cnt,
                                                cpu_cnt=kwargs['phy_cores']-1,
                                                smt_used=smt_used)
        cpuset_main = \
            CpuUtils.cpu_slice_of_list_per_node(node=kwargs['node'],
                                                cpu_node=kwargs['cpu_node'],
                                                skip_cnt=1,
                                                cpu_cnt=1,
                                                smt_used=smt_used)
        # Create config instance
        vpp_config = VppConfigGenerator()
        vpp_config.set_node(kwargs['node'])
        vpp_config.add_unix_cli_listen(value='0.0.0.0:5002')
        vpp_config.add_unix_nodaemon()
        # We will pop first core from list to be main core
        vpp_config.add_cpu_main_core(str(cpuset_main.pop(0)))
        # if this is not only core in list, the rest will be used as workers.
        if cpuset_cpus:
            corelist_workers = ','.join(str(cpu) for cpu in cpuset_cpus)
            vpp_config.add_cpu_corelist_workers(corelist_workers)
        vpp_config.add_plugin('disable', 'dpdk_plugin.so')
        vpp_config.apply_config(filename=kwargs['filename'], restart_vpp=False)