mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2025-10-28 18:52:24 -05:00
78defcd916
- codeberg.org/gruf/go-ffmpreg: v0.6.9 -> v0.6.10
- github.com/ncruces/go-sqlite3: v0.27.1 -> v0.28.0
- github.com/stretchr/testify: v1.10.0 -> v1.11.1
- github.com/tdewolff/minify/v2 v2.23.11 -> v2.24.2
- go.opentelemetry.io/otel{,/*}: v1.37.0 -> v1.38.0
- go.opentelemetry.io/contrib/*: v0.62.0 -> v0.63.0
Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4406
Co-authored-by: kim <grufwub@gmail.com>
Co-committed-by: kim <grufwub@gmail.com>
90 lines
3.1 KiB
Go
90 lines
3.1 KiB
Go
// Copyright 2025 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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// Provenance-includes-location: https://github.com/prometheus/prometheus/blob/93e991ef7ed19cc997a9360c8016cac3767b8057/storage/remote/otlptranslator/prometheus/normalize_label.go
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// Provenance-includes-license: Apache-2.0
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// Provenance-includes-copyright: Copyright The Prometheus Authors
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// Provenance-includes-location: https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/95e8f8fdc2a9dc87230406c9a3cf02be4fd68bea/pkg/translator/prometheus/normalize_label.go
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// Provenance-includes-license: Apache-2.0
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// Provenance-includes-copyright: Copyright The OpenTelemetry Authors.
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package otlptranslator
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import (
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"fmt"
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"strings"
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"unicode"
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)
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// LabelNamer is a helper struct to build label names.
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// It translates OpenTelemetry Protocol (OTLP) attribute names to Prometheus-compliant label names.
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//
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// Example usage:
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//
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// namer := LabelNamer{UTF8Allowed: false}
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// result := namer.Build("http.method") // "http_method"
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type LabelNamer struct {
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UTF8Allowed bool
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}
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// Build normalizes the specified label to follow Prometheus label names standard.
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//
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// Translation rules:
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// - Replaces invalid characters with underscores
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// - Prefixes labels with invalid start characters (numbers or `_`) with "key"
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// - Preserves double underscore labels (reserved names)
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// - If UTF8Allowed is true, returns label as-is
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//
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// Examples:
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//
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// namer := LabelNamer{UTF8Allowed: false}
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// namer.Build("http.method") // "http_method"
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// namer.Build("123invalid") // "key_123invalid"
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// namer.Build("__reserved__") // "__reserved__" (preserved)
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func (ln *LabelNamer) Build(label string) (normalizedName string, err error) {
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defer func() {
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if len(normalizedName) == 0 {
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err = fmt.Errorf("normalization for label name %q resulted in empty name", label)
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return
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}
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if ln.UTF8Allowed || normalizedName == label {
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return
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}
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// Check that the resulting normalized name contains at least one non-underscore character
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for _, c := range normalizedName {
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if c != '_' {
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return
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}
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}
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err = fmt.Errorf("normalization for label name %q resulted in invalid name %q", label, normalizedName)
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normalizedName = ""
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}()
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// Trivial case.
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if len(label) == 0 || ln.UTF8Allowed {
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normalizedName = label
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return
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}
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normalizedName = sanitizeLabelName(label)
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// If label starts with a number, prepend with "key_".
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if unicode.IsDigit(rune(normalizedName[0])) {
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normalizedName = "key_" + normalizedName
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} else if strings.HasPrefix(normalizedName, "_") && !strings.HasPrefix(normalizedName, "__") {
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normalizedName = "key" + normalizedName
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}
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return
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}
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