Updated the license header for the new files linkedmap.go and linkedm…

…ap_test.go

Also resolved a couple of golangci linter warnings.

Signed-off-by: Benjamin Wang <[email protected]>

tools/rw-benchmark/linkedmap.go

@@ -1,5 +1,16 @@
-// Copyright (c) 2019, Benjamin Wang ([email protected]). All rights reserved.
-// Licensed under the MIT license that can be found in the LICENSE file.
+// Copyright 2022 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
 
 // Package linkedmap implements a linked hashmap, based on a map and a doubly linked list. The iteration ordering is normally
 // the order in which keys were inserted into the map, or the order in which the keys were accessed if the accessOrder flag is set.
@@ -115,7 +126,7 @@ func (lm *linkedMap) IsEmpty() bool {
 }
 
 func (lm *linkedMap) Put(k, v interface{}) interface{} {
-	var retVal interface{} = nil
+	var retVal interface{}
 	if oldElement, ok := lm.data[k]; ok {
 
 		retVal = oldElement.value

tools/rw-benchmark/linkedmap_test.go

@@ -1,5 +1,16 @@
-// Copyright (c) 2019, Benjamin Wang ([email protected]). All rights reserved.
-// Licensed under the MIT license that can be found in the LICENSE file.
+// Copyright 2022 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
 
 package main
 

tools/rw-benchmark/plot_data.go

@@ -152,16 +152,16 @@ func loadCSV(filename string) (LinkedMap, error) {
 				if len(qps) != 2 {
 					return nil, fmt.Errorf("unexpected qps values %q at file %q:%d", rec[j], filename, i)
 				}
-				read_qps, err := strconv.ParseFloat(qps[0], 64)
+				readQPS, err := strconv.ParseFloat(qps[0], 64)
 				if err != nil {
 					return nil, fmt.Errorf("failed to parse read qps %q at file %q:%d, error: %w", qps[0], filename, i, err)
 				}
-				sumReadQPS += read_qps
-				write_qps, err := strconv.ParseFloat(qps[1], 64)
+				sumReadQPS += readQPS
+				writeQPS, err := strconv.ParseFloat(qps[1], 64)
 				if err != nil {
 					return nil, fmt.Errorf("failed to parse write qps %q at file %q:%d, error: %w", qps[1], filename, i, err)
 				}
-				sumWriteQPS += write_qps
+				sumWriteQPS += writeQPS
 			}
 			avgReadQPS, avgWriteQPS = sumReadQPS/float64(cnt), sumWriteQPS/float64(cnt)