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k8s.io/apiserver/storage/etcd: refactor etcd GetList.

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reduce redundant update of withRev after request.

Signed-off-by: Siyuan Zhang <sizhang@google.com>
This commit is contained in:
Siyuan Zhang 2023-10-20 12:06:46 -07:00
parent 16fc00493b
commit 84ec5e2ecc
1 changed files with 10 additions and 12 deletions
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22
staging/src/k8s.io/apiserver/pkg/storage/etcd3/store.go
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@ -627,6 +627,11 @@ func (s *store) GetList(ctx context.Context, key string, opts storage.ListOption
limitOption = &options[len(options)-1]
}
if opts.Recursive {
rangeEnd := clientv3.GetPrefixRangeEnd(keyPrefix)
options = append(options, clientv3.WithRange(rangeEnd))
}
newItemFunc := getNewItemFunc(listObj, v)
var fromRV *uint64
@ -675,10 +680,6 @@ func (s *store) GetList(ctx context.Context, key string, opts storage.ListOption
}
}
if opts.Recursive {
rangeEnd := clientv3.GetPrefixRangeEnd(keyPrefix)
options = append(options, clientv3.WithRange(rangeEnd))
}
if withRev != 0 {
options = append(options, clientv3.WithRev(withRev))
}
@ -717,6 +718,11 @@ func (s *store) GetList(ctx context.Context, key string, opts storage.ListOption
if len(getResp.Kvs) == 0 && getResp.More {
return fmt.Errorf("no results were found, but etcd indicated there were more values remaining")
}
// indicate to the client which resource version was returned, and use the same resource version for subsequent requests.
if withRev == 0 {
withRev = getResp.Header.Revision
options = append(options, clientv3.WithRev(withRev))
}
// avoid small allocations for the result slice, since this can be called in many
// different contexts and we don't know how significantly the result will be filtered
@ -768,14 +774,6 @@ func (s *store) GetList(ctx context.Context, key string, opts storage.ListOption
*limitOption = clientv3.WithLimit(limit)
}
preparedKey = string(lastKey) + "\x00"
if withRev == 0 {
withRev = getResp.Header.Revision
options = append(options, clientv3.WithRev(withRev))
}
}
// indicate to the client which resource version was returned
if withRev == 0 {
withRev = getResp.Header.Revision
}
if v.IsNil() {