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https://github.com/ceph/ceph-csi.git
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01a0ec2d8c
For core K8s API objects like Pods, Nodes, etc., we can use protobuf encoding which reduces CPU consumption related to (de)serialization, reduces overall latency of the API call, reduces memory footprint, reduces the amount of work performed by the GC and results in quicker propagation of objects to event handlers of shared informers. Signed-off-by: Nikhil-Ladha <nikhilladha1999@gmail.com>
69 lines
1.8 KiB
Go
69 lines
1.8 KiB
Go
/*
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Copyright 2020 The CephCSI 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/LICENSE2.0
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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 k8s
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import (
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"fmt"
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"os"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/client-go/kubernetes"
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"k8s.io/client-go/rest"
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"k8s.io/client-go/tools/clientcmd"
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)
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var kubeclient *kubernetes.Clientset
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// NewK8sClient create kubernetes client.
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func NewK8sClient() (*kubernetes.Clientset, error) {
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if kubeclient != nil {
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return kubeclient, nil
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}
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var cfg *rest.Config
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var err error
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cPath := os.Getenv("KUBERNETES_CONFIG_PATH")
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if cPath != "" {
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cfg, err = clientcmd.BuildConfigFromFlags("", cPath)
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if err != nil {
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return nil, fmt.Errorf("failed to get cluster config from %q: %w", cPath, err)
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}
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} else {
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cfg, err = rest.InClusterConfig()
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if err != nil {
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return nil, fmt.Errorf("failed to get cluster config: %w", err)
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}
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}
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cfg.ContentType = runtime.ContentTypeProtobuf
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client, err := kubernetes.NewForConfig(cfg)
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if err != nil {
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return nil, fmt.Errorf("failed to create client: %w", err)
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}
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kubeclient = client
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return client, nil
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}
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// RunsOnKubernetes checks if the application is running within a Kubernetes cluster
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// by inspecting the presence of the KUBERNETES_SERVICE_HOST environment variable.
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func RunsOnKubernetes() bool {
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kubernetesServiceHost := os.Getenv("KUBERNETES_SERVICE_HOST")
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return kubernetesServiceHost != ""
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}
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