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Measure and expose DNS programming latency from Kubernetes plugin. (#3171)

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For now metric is measure only for headless services. Informer has been slighlty
refactored, so the code can measure latency without storing extra fields on
Endpoint struct.

Signed-off-by: Janek Łukaszewicz <janluk@google.com>

Suggestions from code review

Co-Authored-By: Chris O'Haver <cohaver@infoblox.com>
This commit is contained in:
janluk
2019-10-04 17:48:43 +02:00
committed by Miek Gieben
parent 03ea2ae955
commit d7cdb992b4
11 changed files with 330 additions and 37 deletions
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21
plugin/kubernetes/object/informer.go
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@@ -5,19 +5,25 @@ import (
"k8s.io/client-go/tools/cache"
)
// NewIndexerInformer is a copy of the cache.NewIndexInformer function, but allows Process to have a conversion function (ToFunc).
func NewIndexerInformer(lw cache.ListerWatcher, objType runtime.Object, h cache.ResourceEventHandler, indexers cache.Indexers, convert ToFunc) (cache.Indexer, cache.Controller) {
// NewIndexerInformer is a copy of the cache.NewIndexerInformer function, but allows custom process function
func NewIndexerInformer(lw cache.ListerWatcher, objType runtime.Object, h cache.ResourceEventHandler, indexers cache.Indexers, builder ProcessorBuilder) (cache.Indexer, cache.Controller) {
clientState := cache.NewIndexer(cache.DeletionHandlingMetaNamespaceKeyFunc, indexers)
fifo := cache.NewDeltaFIFO(cache.MetaNamespaceKeyFunc, clientState)
cfg := &cache.Config{
Queue: fifo,
Queue: cache.NewDeltaFIFO(cache.MetaNamespaceKeyFunc, clientState),
ListerWatcher: lw,
ObjectType: objType,
FullResyncPeriod: defaultResyncPeriod,
RetryOnError: false,
Process: func(obj interface{}) error {
Process: builder(clientState, h),
}
return clientState, cache.New(cfg)
}
// DefaultProcessor is a copy of Process function from cache.NewIndexerInformer except it does a conversion.
func DefaultProcessor(convert ToFunc) ProcessorBuilder {
return func(clientState cache.Indexer, h cache.ResourceEventHandler) cache.ProcessFunc {
return func(obj interface{}) error {
for _, d := range obj.(cache.Deltas) {
obj := convert(d.Object)
@@ -43,9 +49,8 @@ func NewIndexerInformer(lw cache.ListerWatcher, objType runtime.Object, h cache.
}
}
return nil
},
}
}
return clientState, cache.New(cfg)
}
const defaultResyncPeriod = 0