client_golang/prometheus/testutil/promlint/validations/generic_name_validations.go

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// Copyright 2020 The Prometheus 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 validations
import (
"errors"
"fmt"
"regexp"
"strings"
dto "github.com/prometheus/client_model/go"
)
var camelCase = regexp.MustCompile(`[a-z][A-Z]`)
// LintMetricUnits detects issues with metric unit names.
func LintMetricUnits(mf *dto.MetricFamily) []error {
var problems []error
unit, base, ok := metricUnits(*mf.Name)
if !ok {
// No known units detected.
return nil
}
// Unit is already a base unit.
if unit == base {
return nil
}
problems = append(problems, fmt.Errorf("use base unit %q instead of %q", base, unit))
return problems
}
// LintMetricTypeInName detects when the metric type is included in the metric name.
func LintMetricTypeInName(mf *dto.MetricFamily) []error {
if mf.GetType() == dto.MetricType_UNTYPED {
return nil
}
var problems []error
n := strings.ToLower(mf.GetName())
typename := strings.ToLower(mf.GetType().String())
if strings.Contains(n, "_"+typename+"_") || strings.HasSuffix(n, "_"+typename) {
problems = append(problems, fmt.Errorf(`metric name should not include type '%s'`, typename))
}
return problems
}
// LintReservedChars detects colons in metric names.
func LintReservedChars(mf *dto.MetricFamily) []error {
var problems []error
if strings.Contains(mf.GetName(), ":") {
problems = append(problems, errors.New("metric names should not contain ':'"))
}
return problems
}
// LintCamelCase detects metric names and label names written in camelCase.
func LintCamelCase(mf *dto.MetricFamily) []error {
var problems []error
if camelCase.FindString(mf.GetName()) != "" {
problems = append(problems, errors.New("metric names should be written in 'snake_case' not 'camelCase'"))
}
for _, m := range mf.GetMetric() {
for _, l := range m.GetLabel() {
if camelCase.FindString(l.GetName()) != "" {
problems = append(problems, errors.New("label names should be written in 'snake_case' not 'camelCase'"))
}
}
}
return problems
}
// LintUnitAbbreviations detects abbreviated units in the metric name.
func LintUnitAbbreviations(mf *dto.MetricFamily) []error {
var problems []error
n := strings.ToLower(mf.GetName())
for _, s := range unitAbbreviations {
if strings.Contains(n, "_"+s+"_") || strings.HasSuffix(n, "_"+s) {
problems = append(problems, errors.New("metric names should not contain abbreviated units"))
}
}
return problems
}