/
common.go
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/
common.go
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// Copyright 2017 The Kubernetes Dashboard Authors.
//
// 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.
package event
import (
"github.com/kubernetes/dashboard/src/app/backend/api"
"github.com/kubernetes/dashboard/src/app/backend/resource/common"
"github.com/kubernetes/dashboard/src/app/backend/resource/dataselect"
metaV1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
client "k8s.io/client-go/kubernetes"
"k8s.io/client-go/pkg/api/v1"
kubeapi "k8s.io/kubernetes/pkg/api"
)
// EmptyEventList is a empty list of events.
var EmptyEventList = &common.EventList{
Events: make([]common.Event, 0),
ListMeta: api.ListMeta{
TotalItems: 0,
},
}
// GetEvents gets events associated to resource with given name.
func GetEvents(client client.Interface, namespace, resourceName string) ([]v1.Event, error) {
fieldSelector, err := fields.ParseSelector(kubeapi.EventInvolvedNameField + "=" + resourceName)
if err != nil {
return nil, err
}
channels := &common.ResourceChannels{
EventList: common.GetEventListChannelWithOptions(
client,
common.NewSameNamespaceQuery(namespace),
metaV1.ListOptions{
LabelSelector: labels.Everything().String(),
FieldSelector: fieldSelector.String(),
},
1),
}
eventList := <-channels.EventList.List
if err := <-channels.EventList.Error; err != nil {
return nil, err
}
if !IsTypeFilled(eventList.Items) {
eventList.Items = FillEventsType(eventList.Items)
}
return eventList.Items, nil
}
// GetPodsEvents gets events targeting given list of pods.
func GetPodsEvents(client client.Interface, namespace string, pods []v1.Pod) (
[]v1.Event, error) {
nsQuery := common.NewSameNamespaceQuery(namespace)
if namespace == v1.NamespaceAll {
nsQuery = common.NewNamespaceQuery([]string{})
}
channels := &common.ResourceChannels{
EventList: common.GetEventListChannel(client, nsQuery, 1),
}
eventList := <-channels.EventList.List
if err := <-channels.EventList.Error; err != nil {
return nil, err
}
events := filterEventsByPodsUID(eventList.Items, pods)
return events, nil
}
// GetPodEvents gets pods events associated to pod name and namespace
func GetPodEvents(client client.Interface, namespace, podName string) ([]v1.Event, error) {
channels := &common.ResourceChannels{
PodList: common.GetPodListChannel(client,
common.NewSameNamespaceQuery(namespace),
1),
EventList: common.GetEventListChannel(client, common.NewSameNamespaceQuery(namespace), 1),
}
podList := <-channels.PodList.List
if err := <-channels.PodList.Error; err != nil {
return nil, err
}
eventList := <-channels.EventList.List
if err := <-channels.EventList.Error; err != nil {
return nil, err
}
l := make([]v1.Pod, 0)
for _, pi := range podList.Items {
if pi.Name == podName {
l = append(l, pi)
}
}
events := filterEventsByPodsUID(eventList.Items, l)
if !IsTypeFilled(events) {
events = FillEventsType(events)
}
return events, nil
}
// GetNodeEvents gets events associated to node with given name.
func GetNodeEvents(client client.Interface, dsQuery *dataselect.DataSelectQuery, nodeName string) (*common.EventList, error) {
eventList := common.EventList{
Events: make([]common.Event, 0),
}
scheme := runtime.NewScheme()
groupVersion := schema.GroupVersion{Group: "", Version: "v1"}
scheme.AddKnownTypes(groupVersion, &v1.Node{})
mc := client.CoreV1().Nodes()
node, err := mc.Get(nodeName, metaV1.GetOptions{})
if err != nil {
return &eventList, err
}
events, err := client.CoreV1().Events(v1.NamespaceAll).Search(scheme, node)
if err != nil {
return &eventList, err
}
if !IsTypeFilled(events.Items) {
events.Items = FillEventsType(events.Items)
}
eventList = CreateEventList(events.Items, dsQuery)
return &eventList, nil
}
// GetNamespaceEvents gets events associated to a namespace with given name.
func GetNamespaceEvents(client client.Interface, dsQuery *dataselect.DataSelectQuery, namespace string) (common.EventList, error) {
events, _ := client.Core().Events(namespace).List(metaV1.ListOptions{
LabelSelector: labels.Everything().String(),
FieldSelector: fields.Everything().String(),
})
if !IsTypeFilled(events.Items) {
events.Items = FillEventsType(events.Items)
}
return CreateEventList(events.Items, dsQuery), nil
}
// Based on event Reason fills event Type in order to allow correct filtering by Type.
func FillEventsType(events []v1.Event) []v1.Event {
for i := range events {
if isFailedReason(events[i].Reason, FailedReasonPartials...) {
events[i].Type = v1.EventTypeWarning
} else {
events[i].Type = v1.EventTypeNormal
}
}
return events
}
// IsTypeFilled returns true if all given events type is filled, false otherwise.
// This is needed as some older versions of kubernetes do not have Type property filled.
func IsTypeFilled(events []v1.Event) bool {
if len(events) == 0 {
return false
}
for _, event := range events {
if len(event.Type) == 0 {
return false
}
}
return true
}
// ToEvent converts event api Event to Event model object.
func ToEvent(event v1.Event) common.Event {
result := common.Event{
ObjectMeta: api.NewObjectMeta(event.ObjectMeta),
TypeMeta: api.NewTypeMeta(api.ResourceKindEvent),
Message: event.Message,
SourceComponent: event.Source.Component,
SourceHost: event.Source.Host,
SubObject: event.InvolvedObject.FieldPath,
Count: event.Count,
FirstSeen: event.FirstTimestamp,
LastSeen: event.LastTimestamp,
Reason: event.Reason,
Type: event.Type,
}
return result
}
// CreateEventList converts array of api events to common EventList structure
func CreateEventList(events []v1.Event, dsQuery *dataselect.DataSelectQuery) common.EventList {
eventList := common.EventList{
Events: make([]common.Event, 0),
ListMeta: api.ListMeta{TotalItems: len(events)},
}
events = fromCells(dataselect.GenericDataSelect(toCells(events), dsQuery))
for _, event := range events {
eventDetail := ToEvent(event)
eventList.Events = append(eventList.Events, eventDetail)
}
return eventList
}
// The code below allows to perform complex data section on []api.Event
type EventCell v1.Event
func (self EventCell) GetProperty(name dataselect.PropertyName) dataselect.ComparableValue {
switch name {
case dataselect.NameProperty:
return dataselect.StdComparableString(self.ObjectMeta.Name)
case dataselect.CreationTimestampProperty:
return dataselect.StdComparableTime(self.ObjectMeta.CreationTimestamp.Time)
case dataselect.NamespaceProperty:
return dataselect.StdComparableString(self.ObjectMeta.Namespace)
default:
// if name is not supported then just return a constant dummy value, sort will have no effect.
return nil
}
}
func toCells(std []v1.Event) []dataselect.DataCell {
cells := make([]dataselect.DataCell, len(std))
for i := range std {
cells[i] = EventCell(std[i])
}
return cells
}
func fromCells(cells []dataselect.DataCell) []v1.Event {
std := make([]v1.Event, len(cells))
for i := range std {
std[i] = v1.Event(cells[i].(EventCell))
}
return std
}