70 lines
1.7 KiB
Go
70 lines
1.7 KiB
Go
// Copyright 2014 Prometheus Team
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package model
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import (
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"hash/fnv"
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"sort"
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)
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// cache the signature of an empty label set.
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var emptyLabelSignature = fnv.New64a().Sum64()
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// LabelsToSignature provides a way of building a unique signature
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// (i.e., fingerprint) for a given label set sequence.
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func LabelsToSignature(labels map[string]string) uint64 {
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if len(labels) == 0 {
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return emptyLabelSignature
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}
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names := make([]string, 0, len(labels))
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for name := range labels {
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names = append(names, name)
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}
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sort.Strings(names)
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hasher := fnv.New64a()
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for _, name := range names {
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hasher.Write([]byte(name))
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hasher.Write([]byte(labels[name]))
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}
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return hasher.Sum64()
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}
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// LabelValuesToSignature provides a way of building a unique signature
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// (i.e., fingerprint) for a given set of label's values.
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func LabelValuesToSignature(labels map[string]string) uint64 {
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if len(labels) == 0 {
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return emptyLabelSignature
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}
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names := make([]string, 0, len(labels))
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for name := range labels {
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names = append(names, name)
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}
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sort.Strings(names)
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hasher := fnv.New64a()
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for _, name := range names {
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hasher.Write([]byte(labels[name]))
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}
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return hasher.Sum64()
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}
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