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🐛 Return error when object limit exceeded for cached list calls #3045

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🐛 Return error when object limit exceeded for cached list calls #3045

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12 changes: 7 additions & 5 deletions pkg/cache/internal/cache_reader.go
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Original file line number Diff line number Diff line change
Expand Up @@ -139,15 +139,17 @@ func (c *CacheReader) List(_ context.Context, out client.ObjectList, opts ...cli
labelSel = listOpts.LabelSelector
}

// Since the cache does not implement strongly consistent paginated list
// calls, if the Limit option is set and the number of items listed exceeds
// this limit, there is no way for the caller to get a complete list of
// objects, so return an error here to notify the caller.
limitSet := listOpts.Limit > 0
if limitSet && int64(len(objs)) > listOpts.Limit {
return fmt.Errorf("object limit exceeded but paginated list is not supported by the cache")
}

runtimeObjs := make([]runtime.Object, 0, len(objs))
for _, item := range objs {
// if the Limit option is set and the number of items
// listed exceeds this limit, then stop reading.
if limitSet && int64(len(runtimeObjs)) >= listOpts.Limit {
break
}
obj, isObj := item.(runtime.Object)
if !isObj {
return fmt.Errorf("cache contained %T, which is not an Object", item)
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