mirror of
https://github.com/TECHNOFAB11/zfs-localpv.git
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101 lines
3 KiB
Go
101 lines
3 KiB
Go
/*
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Copyright 2020 The OpenEBS Authors
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package v1alpha1
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import (
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"github.com/pkg/errors"
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corev1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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)
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// NodeGetter abstracts fetching of Node details from kubernetes cluster
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type NodeGetter interface {
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Get(name string, options metav1.GetOptions) (*corev1.Node, error)
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}
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// NodeLister abstracts fetching of Nodes from kubernetes cluster
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type NodeLister interface {
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List(options metav1.ListOptions) (*corev1.NodeList, error)
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}
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//NodeStruct returns a struct used to instantiate a kubernetes Node
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type NodeStruct struct{}
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// Node returnd a pointer to the node struct
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func Node() *NodeStruct {
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return &NodeStruct{}
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}
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// Get returns a node instance from kubernetes cluster
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func (n *NodeStruct) Get(name string, options metav1.GetOptions) (*corev1.Node, error) {
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cs, err := Clientset().Get()
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if err != nil {
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return nil, errors.Wrapf(err, "failed to get node: %s", name)
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}
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return cs.CoreV1().Nodes().Get(name, options)
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}
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// List returns a slice of Nodes registered in a Kubernetes cluster
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func (n *NodeStruct) List(options metav1.ListOptions) (*corev1.NodeList, error) {
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cs, err := Clientset().Get()
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if err != nil {
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return nil, errors.Wrapf(err, "failed to get nodes")
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}
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return cs.CoreV1().Nodes().List(options)
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}
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// NumberOfNodes returns the number of nodes registered in a Kubernetes cluster
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func NumberOfNodes() (int, error) {
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n := Node()
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nodes, err := n.List(metav1.ListOptions{})
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if err != nil {
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return 0, errors.Wrapf(err, "failed to get the number of nodes")
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}
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return len(nodes.Items), nil
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}
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// GetNode returns a node instance from kubernetes cluster
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func GetNode(name string) (*corev1.Node, error) {
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n := Node()
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node, err := n.Get(name, metav1.GetOptions{})
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if err != nil {
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return nil, errors.Wrapf(err, "failed to get node")
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}
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return node, nil
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}
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// ListNodes returns list of node instance from kubernetes cluster
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func ListNodes(options metav1.ListOptions) (*corev1.NodeList, error) {
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n := Node()
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nodelist, err := n.List(options)
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if err != nil {
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return nil, errors.Wrapf(err, "failed to list node")
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}
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return nodelist, nil
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}
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// GetOSAndKernelVersion gets us the OS,Kernel version
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func GetOSAndKernelVersion() (string, error) {
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nodes := Node()
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// get a single node
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firstNode, err := nodes.List(metav1.ListOptions{Limit: 1})
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if err != nil {
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return "unknown, unknown", errors.Wrapf(err, "failed to get the os kernel/arch")
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}
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nodedetails := firstNode.Items[0].Status.NodeInfo
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return nodedetails.OSImage + ", " + nodedetails.KernelVersion, nil
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}
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