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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.
"""
Kubernetes cluster api helper functions
"""
import time
from kubernetes import client, config
from kubernetes.stream import stream
from tools.conf import settings # pylint: disable=import-error
def load_kube_api():
"""
Loads kubernetes api
"""
config.load_kube_config(settings.getValue('kube_config'))
api = client.CoreV1Api()
settings.setValue('kube_api', api)
def kube_api():
"""
Returns kube_api object
"""
return settings.getValue('kube_api')
def get_pod_with_labels(labels):
"""
Returns json details any one pod with matching labels
:param labels: labels to find matching pod
:return: pod details
"""
api = kube_api()
pod = api.list_pod_for_all_namespaces(label_selector=labels).items[0]
return pod
def kube_exec(pod, cmd):
"""
Executes `cmd` inside `pod` and returns response
:param pod: pod object
:param cmd: command to execute inside pod
:return: response from pod
"""
api = kube_api()
response = stream(api.connect_get_namespaced_pod_exec,
pod.metadata.name, pod.metadata.namespace, command=cmd,
stderr=True, stdin=False, stdout=True, tty=False)
return response
def kube_curl(*args):
"""
executes curl cmd in kubernetes network
:param args: comma separated list of args to pass to curl
:return: http response
"""
args = list(args)
args.insert(0, "curl")
try:
pod = get_pod_with_labels("application=sdvstate-curl")
except IndexError:
create_kube_curl_pod()
pod = get_pod_with_labels("application=sdvstate-curl")
finally:
response = kube_exec(pod, args)
return response
def create_kube_curl_pod():
"""
Create a sandbox pod(image: curlimages/curl:7.76.1) for
curl utility inside kubernetes cluster.
"""
print(("Creating pod sdvstate-curl..."))
pod_manifest = {
'apiVersion': 'v1',
'kind': 'Pod',
'metadata': {
'name': 'sdvstate-curl',
'labels': {
'application': 'sdvstate-curl'
}
},
'spec': {
'containers': [{
'image': 'curlimages/curl:7.76.1',
'name': 'sdvstate-curl',
'command': ["/bin/sh"],
"args": [
"-c",
"while true; do sleep 5; done"
]
}]
}
}
api = kube_api()
response = api.create_namespaced_pod(body=pod_manifest,
namespace='default')
# wait 1 minute or less for pod to create.
seconds_left = 60
while seconds_left:
resp = api.read_namespaced_pod(name='sdvstate-curl',
namespace='default')
if resp.status.phase == 'Running':
break
time.sleep(3)
seconds_left -= 3
if seconds_left == 0:
raise Exception("sdvstate-curl pod taking took long to create, tests failed...")
def delete_kube_curl_pod():
"""
Cleans curl utility pod
"""
api = kube_api()
api.delete_namespaced_pod(name='sdvstate-curl', body={},
namespace='default')
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