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client.go
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client.go
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// +build !windows
package kubernetesmonitor
import (
"fmt"
"go.uber.org/zap"
api "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/kubernetes"
kubecache "k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/clientcmd"
)
// NewKubeClient Generate and initialize a Kubernetes client based on the parameter kubeconfig
func NewKubeClient(kubeconfig string) (*kubernetes.Clientset, error) {
config, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
if err != nil {
return nil, fmt.Errorf("Error Building config from Kubeconfig: %v", err)
}
return kubernetes.NewForConfig(config)
}
// CreateResourceController creates a controller for a specific ressource and namespace.
// The parameter function will be called on Add/Delete/Update events
func CreateResourceController(client kubecache.Getter, resource string, namespace string, apiStruct runtime.Object, selector fields.Selector,
addFunc func(addedApiStruct interface{}), deleteFunc func(deletedApiStruct interface{}), updateFunc func(oldApiStruct, updatedApiStruct interface{})) (kubecache.Store, kubecache.Controller) {
handlers := kubecache.ResourceEventHandlerFuncs{
AddFunc: addFunc,
DeleteFunc: deleteFunc,
UpdateFunc: updateFunc,
}
listWatch := kubecache.NewListWatchFromClient(client, resource, namespace, selector)
store, controller := kubecache.NewInformer(listWatch, apiStruct, 0, handlers)
return store, controller
}
// CreateLocalPodController creates a controller specifically for Pods.
func (m *KubernetesMonitor) CreateLocalPodController(namespace string,
addFunc func(addedApiStruct *api.Pod) error, deleteFunc func(deletedApiStruct *api.Pod) error, updateFunc func(oldApiStruct, updatedApiStruct *api.Pod) error) (kubecache.Store, kubecache.Controller) {
return CreateResourceController(m.kubeClient.CoreV1().RESTClient(), "pods", namespace, &api.Pod{}, m.localNodeSelector(),
func(addedApiStruct interface{}) {
if err := addFunc(addedApiStruct.(*api.Pod)); err != nil {
zap.L().Error("Error while handling Add Pod", zap.Error(err))
}
},
func(deletedApiStruct interface{}) {
if err := deleteFunc(deletedApiStruct.(*api.Pod)); err != nil {
zap.L().Error("Error while handling Delete Pod", zap.Error(err))
}
},
func(oldApiStruct, updatedApiStruct interface{}) {
if err := updateFunc(oldApiStruct.(*api.Pod), updatedApiStruct.(*api.Pod)); err != nil {
zap.L().Error("Error while handling Update Pod", zap.Error(err))
}
})
}
func (m *KubernetesMonitor) localNodeSelector() fields.Selector {
return fields.Set(map[string]string{
"spec.nodeName": m.localNode,
}).AsSelector()
}
// Pod returns the full pod object.
func (m *KubernetesMonitor) Pod(podName string, namespace string) (*api.Pod, error) {
targetPod, err := m.kubeClient.CoreV1().Pods(namespace).Get(podName, metav1.GetOptions{})
if err != nil {
return nil, fmt.Errorf("error getting Kubernetes labels & IP for pod %v : %v ", podName, err)
}
return targetPod, nil
}