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# Copyright 2020 University Of Delhi.
#
# 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.
"""
Automation of Pod Deployment with Kubernetes Python API
"""
# import os
import logging
import json
import time
import yaml
from kubernetes import client, config
from kubernetes.client.rest import ApiException
from conf import settings as S
from pods.pod.pod import IPod
class Papi(IPod):
"""
Class for controlling the pod through PAPI
"""
def __init__(self):
"""
Initialisation function.
"""
#super(Papi, self).__init__()
super().__init__()
self._logger = logging.getLogger(__name__)
self._sriov_config = None
self._sriov_config_ns = None
def create(self):
"""
Creation Process
"""
print("Entering Create Function")
config.load_kube_config(S.getValue('K8S_CONFIG_FILEPATH'))
# create vswitchperf namespace
api = client.CoreV1Api()
namespace = 'default'
pod_manifests = S.getValue('POD_MANIFEST_FILEPATH')
pod_count = int(S.getValue('POD_COUNT'))
#namespace = 'vswitchperf'
# replace_namespace(api, namespace)
# sriov configmap
if S.getValue('PLUGIN') == 'sriov':
configmap = load_manifest(S.getValue('CONFIGMAP_FILEPATH'))
self._sriov_config = configmap['metadata']['name']
self._sriov_config_ns = configmap['metadata']['namespace']
api.create_namespaced_config_map(self._sriov_config_ns, configmap)
# create nad(network attachent definitions)
group = 'k8s.cni.cncf.io'
version = 'v1'
kind_plural = 'network-attachment-definitions'
api = client.CustomObjectsApi()
assert pod_count <= len(pod_manifests)
for nad_filepath in S.getValue('NETWORK_ATTACHMENT_FILEPATH'):
nad_manifest = load_manifest(nad_filepath)
try:
response = api.create_namespaced_custom_object(group, version, namespace,
kind_plural, nad_manifest)
self._logger.info(str(response))
self._logger.info("Created Network Attachment Definition: %s", nad_filepath)
except ApiException as err:
raise Exception from err
#create pod workloads
api = client.CoreV1Api()
for count in range(pod_count):
pod_manifest = load_manifest(pod_manifests[count])
try:
response = api.create_namespaced_pod(namespace, pod_manifest)
self._logger.info(str(response))
self._logger.info("Created POD %d ...", self._number)
except ApiException as err:
raise Exception from err
time.sleep(12)
def terminate(self):
"""
Cleanup Process
"""
#self._logger.info(self._log_prefix + "Cleaning vswitchperf namespace")
self._logger.info("Terminating Pod")
api = client.CoreV1Api()
# api.delete_namespace(name="vswitchperf", body=client.V1DeleteOptions())
if S.getValue('PLUGIN') == 'sriov':
api.delete_namespaced_config_map(self._sriov_config, self._sriov_config_ns)
def load_manifest(filepath):
"""
Reads k8s manifest files and returns as string
:param str filepath: filename of k8s manifest file to read
:return: k8s resource definition as string
"""
with open(filepath) as handle:
data = handle.read()
try:
manifest = json.loads(data)
except ValueError:
try:
manifest = yaml.safe_load(data)
except yaml.parser.ParserError as err:
raise Exception from err
return manifest
def replace_namespace(api, namespace):
"""
Creates namespace if does not exists
"""
namespaces = api.list_namespace()
for nsi in namespaces.items:
if namespace == nsi.metadata.name:
api.delete_namespace(name=namespace,
body=client.V1DeleteOptions())
break
time.sleep(0.5)
api.create_namespace(client.V1Namespace(
metadata=client.V1ObjectMeta(name=namespace)))
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