tools/etcd-dump-metrics: automate metrics fetch from release binaries

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

tools/etcd-dump-metrics/utils.go

@@ -0,0 +1,39 @@
+// Copyright 2018 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
+
+import "sort"
+
+func aggSort(ss []string) (sorted []string) {
+	set := make(map[string]struct{})
+	for _, s := range ss {
+		set[s] = struct{}{}
+	}
+	sorted = make([]string, 0, len(set))
+	for k := range set {
+		sorted = append(sorted, k)
+	}
+	sort.Strings(sorted)
+	return sorted
+}
+
+func sortMap(set map[string]struct{}) (sorted []string) {
+	sorted = make([]string, 0, len(set))
+	for k := range set {
+		sorted = append(sorted, k)
+	}
+	sort.Strings(sorted)
+	return sorted
+}