122 lines
5.1 KiB
Python
122 lines
5.1 KiB
Python
# Copyright 2018 AT&T Intellectual Property. All other rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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from functools import wraps
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from airflow.exceptions import AirflowException
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from kubernetes import client, config
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def get_pod_port_ip(*pods, namespace):
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def get_k8s_pod_port_ip(func):
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@wraps(func)
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def k8s_pod_port_ip_get(self, pods_ip_port):
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"""This function retrieves Kubernetes Pod Port and IP
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information. It can be used to retrieve information of
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single pod deployment and/or statefulsets. For instance,
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it can be used to retrieve the tiller pod IP and port
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information for usage in the Armada Operator.
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:param pods_ip_port: IP and port information of the pods
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Example::
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from get_k8s_pod_port_ip import get_pod_port_ip
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@get_pod_port_ip('tiller', namespace='kube-system')
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def get_pod_info(self, pods_ip_port={}):
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tiller_ip = pods_ip_port['tiller']['ip']
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tiller_port = pods_ip_port['tiller']['port']
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"""
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# Initialize variable
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k8s_pods = {}
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# The function allows us to query information on multiple
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# pods
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for pod_name in pods:
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# Initialize variables
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pod_attr = {}
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pod_attr[pod_name] = {}
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# Initialize/Reset counter
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count = 0
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# Make use of kubernetes client to retrieve pod IP
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# and port information
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# Note that we should use 'in_cluster_config'
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# Note that we will only search for pods in the namespace
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# that was specified in the request
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config.load_incluster_config()
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v1 = client.CoreV1Api()
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ret = v1.list_namespaced_pod(namespace=namespace,
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watch=False)
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# Loop through items to extract port and IP information
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# of the pod
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for i in ret.items:
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if pod_name in i.metadata.name:
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# Get pod IP
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logging.info("Retrieving %s IP", pod_name)
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pod_attr[pod_name]['ip'] = i.status.pod_ip
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logging.info("%s IP is %s", pod_name,
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pod_attr[pod_name]['ip'])
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# Get pod port
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logging.info("Retrieving %s Port", pod_name)
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# It is possible for a pod to have an IP with no
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# port. For instance maas-rack takes on genesis
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# node IP and has no port associated with it. We
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# will assign the value 'None' to the port value
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# in such cases.
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try:
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specs_dict = i.spec.containers[0].__dict__
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ports_dict = specs_dict['_ports'][0].__dict__
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pod_attr[pod_name]['port'] = (
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ports_dict['_container_port'])
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logging.info("%s Port is %s", pod_name,
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pod_attr[pod_name]['port'])
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except:
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pod_attr[pod_name]['port'] = 'None'
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logging.warning("%s Port is None", pod_name)
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# Update k8s_pods with new entry
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k8s_pods.update(pod_attr)
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# It is possible for different pods to have the same
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# partial names. This means that we can end up with
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# inconsistent results depending on how the pods were
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# ordered in the results for 'list_namespaced_pod'.
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# Hence an exception should be raised when the function
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# returns results for 2 or more pods.
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if count > 0:
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raise AirflowException(
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"Pod search string is not unique!")
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# Step counter
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count += 1
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# Raise Execptions if the pod does not exits in the
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# Kubernetes cluster
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if not pod_attr[pod_name]:
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raise AirflowException("Unable to locate", pod_name)
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return func(self, pods_ip_port=k8s_pods)
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return k8s_pod_port_ip_get
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return get_k8s_pod_port_ip
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