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labeler.go
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labeler.go
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package appender
import (
"github.com/kiali/kiali/config"
"github.com/kiali/kiali/graph"
"github.com/kiali/kiali/log"
)
const LabelerAppenderName = "labeler"
// LabelerAppender is responsible for obtaining and attaching all k8s labels to all nodes in the graph.
// Name: labeler
type LabelerAppender struct{}
// Name implements Appender
func (f *LabelerAppender) Name() string {
return LabelerAppenderName
}
// IsFinalizer implements Appender
func (a LabelerAppender) IsFinalizer() bool {
return true
}
// AppendGraph implements Appender
func (f *LabelerAppender) AppendGraph(trafficMap graph.TrafficMap, globalInfo *graph.AppenderGlobalInfo, _namespaceInfo *graph.AppenderNamespaceInfo) {
if len(trafficMap) == 0 {
return
}
labelNodes(trafficMap, globalInfo)
}
// labelNodes puts all k8s labels in the metadata for all nodes.
func labelNodes(trafficMap graph.TrafficMap, gi *graph.AppenderGlobalInfo) {
// We need to know the names of the Istio labels for app and version because we do not label the nodes with those.
// There is no need to get the Istio label names multiple times, so get them once now.
istioLabelNames := config.Get().IstioLabels
for _, n := range trafficMap {
// can't get labels for nodes on the outside or inaccessible nodes, so just go to the next and ignore this one.
if b, ok := n.Metadata[graph.IsOutside]; ok && b.(bool) {
continue
}
if b, ok := n.Metadata[graph.IsInaccessible]; ok && b.(bool) {
continue
}
var labelsMetadata graph.LabelsMetadata
switch n.NodeType {
case graph.NodeTypeApp:
if n.Version != "" {
// the node is a "versioned-app" node
if wl, ok := getWorkload(n.Namespace, n.Workload, gi); ok {
labelsMetadata = copyMap(wl.Labels)
} else {
log.Debugf("Failed to obtain versioned-app details for [%+v]", n)
}
} else {
if app, ok := getApp(n.Namespace, n.App, gi); ok {
labelsMetadata = copyMap(app.Labels)
} else {
log.Debugf("Failed to obtain app details for [%+v]", n)
}
}
case graph.NodeTypeService:
if svc, ok := getServiceDefinition(n.Namespace, n.Service, gi); ok {
labelsMetadata = copyMap(svc.Labels)
} else {
log.Debugf("Failed to obtain service details for [%+v]", n)
}
case graph.NodeTypeWorkload:
if wl, ok := getWorkload(n.Namespace, n.Workload, gi); ok {
labelsMetadata = copyMap(wl.Labels)
} else {
log.Debugf("Failed to obtain workload details for [%+v].", n)
}
default:
// skip any other nodes
}
if len(labelsMetadata) > 0 {
n.Metadata[graph.Labels] = labelsMetadata
delete(n.Metadata[graph.Labels].(graph.LabelsMetadata), istioLabelNames.AppLabelName)
delete(n.Metadata[graph.Labels].(graph.LabelsMetadata), istioLabelNames.VersionLabelName)
}
}
}
func copyMap(orig map[string]string) map[string]string {
c := make(map[string]string, len(orig))
for k, v := range orig {
c[k] = v
}
return c
}