45 lines
1.3 KiB
Go
45 lines
1.3 KiB
Go
// Copyright 2024 The Prometheus Authors
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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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//go:build go1.21
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package model
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import (
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"bytes"
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"slices"
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"strconv"
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)
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// String will look like `{foo="bar", more="less"}`. Names are sorted alphabetically.
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func (l LabelSet) String() string {
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var lna [32]string // On stack to avoid memory allocation for sorting names.
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labelNames := lna[:0]
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for name := range l {
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labelNames = append(labelNames, string(name))
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}
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slices.Sort(labelNames)
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var bytea [1024]byte // On stack to avoid memory allocation while building the output.
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b := bytes.NewBuffer(bytea[:0])
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b.WriteByte('{')
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for i, name := range labelNames {
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if i > 0 {
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b.WriteString(", ")
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}
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b.WriteString(name)
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b.WriteByte('=')
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b.Write(strconv.AppendQuote(b.AvailableBuffer(), string(l[LabelName(name)])))
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}
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b.WriteByte('}')
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return b.String()
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}
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