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✨ SetErrorWatchHandler on SharedIndexInformer #2494

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merged 2 commits into from Sep 24, 2023
Merged

✨ SetErrorWatchHandler on SharedIndexInformer #2494

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0c894a4
add SetErrorWatchHandler to informers
troy0820 Sep 14, 2023
897e04c
pass watchErrorHandler through Options struct
troy0820 Sep 18, 2023
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7 changes: 7 additions & 0 deletions pkg/cache/cache.go
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Expand Up @@ -188,6 +188,12 @@ type Options struct {
// unless there is already one set in ByObject or DefaultNamespaces.
DefaultTransform toolscache.TransformFunc

// DefaultWatchErrorHandler will be used to the WatchErrorHandler which is called
// whenever ListAndWatch drops the connection with an error.
//
// After calling this handler, the informer will backoff and retry.
DefaultWatchErrorHandler toolscache.WatchErrorHandler
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// DefaultUnsafeDisableDeepCopy is the default for UnsafeDisableDeepCopy
// for everything that doesn't specify this.
//
Expand Down Expand Up @@ -353,6 +359,7 @@ func newCache(restConfig *rest.Config, opts Options) newCacheFunc {
Field: config.FieldSelector,
},
Transform: config.Transform,
WatchErrorHandler: opts.DefaultWatchErrorHandler,
UnsafeDisableDeepCopy: pointer.BoolDeref(config.UnsafeDisableDeepCopy, false),
NewInformer: opts.newInformer,
}),
Expand Down
14 changes: 14 additions & 0 deletions pkg/cache/internal/informers.go
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Expand Up @@ -49,6 +49,7 @@ type InformersOpts struct {
Selector Selector
Transform cache.TransformFunc
UnsafeDisableDeepCopy bool
WatchErrorHandler cache.WatchErrorHandler
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}

// NewInformers creates a new InformersMap that can create informers under the hood.
Expand Down Expand Up @@ -76,6 +77,7 @@ func NewInformers(config *rest.Config, options *InformersOpts) *Informers {
transform: options.Transform,
unsafeDisableDeepCopy: options.UnsafeDisableDeepCopy,
newInformer: newInformer,
watchErrorHandler: options.WatchErrorHandler,
}
}

Expand Down Expand Up @@ -159,6 +161,11 @@ type Informers struct {

// NewInformer allows overriding of the shared index informer constructor for testing.
newInformer func(cache.ListerWatcher, runtime.Object, time.Duration, cache.Indexers) cache.SharedIndexInformer

// WatchErrorHandler allows the shared index informer's
// watchErrorHandler to be set by overriding the options
// or to use the default watchErrorHandler
watchErrorHandler cache.WatchErrorHandler
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}

// Start calls Run on each of the informers and sets started to true. Blocks on the context.
Expand Down Expand Up @@ -323,6 +330,13 @@ func (ip *Informers) addInformerToMap(gvk schema.GroupVersionKind, obj runtime.O
cache.NamespaceIndex: cache.MetaNamespaceIndexFunc,
})

// Set WatchErrorHandler on SharedIndexInformer if set
if ip.watchErrorHandler != nil {
if err := sharedIndexInformer.SetWatchErrorHandler(ip.watchErrorHandler); err != nil {
return nil, false, err
}
}

// Check to see if there is a transformer for this gvk
if err := sharedIndexInformer.SetTransform(ip.transform); err != nil {
return nil, false, err
Expand Down