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Split executeRange function #19808

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Merged
serathius merged 1 commit into from
May 30, 2025
Merged

Split executeRange function #19808

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47 changes: 31 additions & 16 deletions server/etcdserver/txn/range.go
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Original file line number Diff line number Diff line change
Expand Up @@ -43,9 +43,29 @@ func Range(ctx context.Context, lg *zap.Logger, kv mvcc.KV, r *pb.RangeRequest)
func executeRange(ctx context.Context, lg *zap.Logger, txnRead mvcc.TxnRead, r *pb.RangeRequest) (*pb.RangeResponse, error) {
trace := traceutil.Get(ctx)

resp := &pb.RangeResponse{}
resp.Header = &pb.ResponseHeader{}
limit := rangeLimit(r)
ro := mvcc.RangeOptions{
Limit: limit,
Rev: r.Revision,
Count: r.CountOnly,
}

rr, err := txnRead.Range(ctx, r.Key, mkGteRange(r.RangeEnd), ro)
if err != nil {
return nil, err
}

filterRangeResults(rr, r)
sortRangeResults(rr, r, lg)
trace.Step("filter and sort the key-value pairs")

resp := asembleRangeResponse(rr, r)
trace.Step("assemble the response")

return resp, nil
}

func rangeLimit(r *pb.RangeRequest) int64 {
limit := r.Limit
if r.SortOrder != pb.RangeRequest_NONE ||
r.MinModRevision != 0 || r.MaxModRevision != 0 ||
Expand All @@ -57,18 +77,10 @@ func executeRange(ctx context.Context, lg *zap.Logger, txnRead mvcc.TxnRead, r *
// fetch one extra for 'more' flag
limit = limit + 1
}
return limit
}

ro := mvcc.RangeOptions{
Limit: limit,
Rev: r.Revision,
Count: r.CountOnly,
}

rr, err := txnRead.Range(ctx, r.Key, mkGteRange(r.RangeEnd), ro)
if err != nil {
return nil, err
}

func filterRangeResults(rr *mvcc.RangeResult, r *pb.RangeRequest) {
if r.MaxModRevision != 0 {
f := func(kv *mvccpb.KeyValue) bool { return kv.ModRevision > r.MaxModRevision }
pruneKVs(rr, f)
Expand All @@ -85,7 +97,9 @@ func executeRange(ctx context.Context, lg *zap.Logger, txnRead mvcc.TxnRead, r *
f := func(kv *mvccpb.KeyValue) bool { return kv.CreateRevision < r.MinCreateRevision }
pruneKVs(rr, f)
}
}

func sortRangeResults(rr *mvcc.RangeResult, r *pb.RangeRequest, lg *zap.Logger) {
sortOrder := r.SortOrder
if r.SortTarget != pb.RangeRequest_KEY && sortOrder == pb.RangeRequest_NONE {
// Since current mvcc.Range implementation returns results
Expand Down Expand Up @@ -121,12 +135,14 @@ func executeRange(ctx context.Context, lg *zap.Logger, txnRead mvcc.TxnRead, r *
sort.Sort(sort.Reverse(sorter))
}
}
}

func asembleRangeResponse(rr *mvcc.RangeResult, r *pb.RangeRequest) *pb.RangeResponse {
resp := &pb.RangeResponse{Header: &pb.ResponseHeader{}}
if r.Limit > 0 && len(rr.KVs) > int(r.Limit) {
rr.KVs = rr.KVs[:r.Limit]
resp.More = true
}
trace.Step("filter and sort the key-value pairs")
resp.Header.Revision = rr.Rev
resp.Count = int64(rr.Count)
resp.Kvs = make([]*mvccpb.KeyValue, len(rr.KVs))
Expand All @@ -136,8 +152,7 @@ func executeRange(ctx context.Context, lg *zap.Logger, txnRead mvcc.TxnRead, r *
}
resp.Kvs[i] = &rr.KVs[i]
}
trace.Step("assemble the response")
return resp, nil
return resp
}

func checkRange(rv mvcc.ReadView, req *pb.RangeRequest) error {
Expand Down