vendor/github.com/uber/jaeger-lib/metrics/keys.go

// Copyright (c) 2017 Uber Technologies, Inc.
//
// 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 metrics

import (
	"sort"
)

// GetKey converts name+tags into a single string of the form
// "name|tag1=value1|...|tagN=valueN", where tag names are
// sorted alphabetically.
func GetKey(name string, tags map[string]string, tagsSep string, tagKVSep string) string {
	keys := make([]string, 0, len(tags))
	for k := range tags {
		keys = append(keys, k)
	}
	sort.Strings(keys)
	key := name
	for _, k := range keys {
		key = key + tagsSep + k + tagKVSep + tags[k]
	}
	return key
}