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promlabels.go
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promlabels.go
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// Copyright 2023 Chronosphere 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 parsing contains methods for parsing strings into various types.
package parsing
import (
"fmt"
"github.com/alecthomas/participle/v2"
"github.com/chronosphereio/chronoctl-core/src/generated/swagger/configv1/models"
"github.com/pkg/errors"
)
var (
promLabelsParser = participle.MustBuild[PromLabels](participle.Unquote())
)
// PromLabelParser returns a parser for PromLabels
func PromLabelParser() *participle.Parser[PromLabels] {
return promLabelsParser
}
// FromPromLabelsToMutingMatchers converts a string representing labels in Prometheus format to a list of
// muting matchers.
func FromPromLabelsToMutingMatchers(s string) ([]*models.Configv1MutingRuleLabelMatcher, error) {
if s == "" {
return nil, nil
}
labelsHolder, err := promLabelsParser.ParseString("", s)
if err != nil {
return nil, errors.Wrap(err, "invalid labels string")
}
if len(labelsHolder.Labels) == 0 {
return nil, nil
}
matchers := make([]*models.Configv1MutingRuleLabelMatcher, len(labelsHolder.Labels))
for i, matcher := range labelsHolder.Labels {
matcherType, err := OpToMutingMatcherType(matcher.Op)
if err != nil {
return nil, err
}
matchers[i] = &models.Configv1MutingRuleLabelMatcher{
Name: matcher.Name,
Value: matcher.Value,
Type: matcherType,
}
}
return matchers, nil
}
// PromLabels represents a list of key-value labels surrounded by brackets.
type PromLabels struct {
Labels []PromLabel `"{" ( @@ ","? )* "}"` //nolint:govet
}
// PromLabel represents a single key-value pair.
type PromLabel struct {
Name string `@Ident` //nolint:govet
Op string `@(("=" "~") | "=" | ("!" "=") | ("!" "~"))` //nolint:govet
Value string `@String` //nolint:govet
}
// OpToMutingMatcherType converts an op string to a entities MutingMatcherType
func OpToMutingMatcherType(op string) (models.Configv1MutingRuleLabelMatcherMatcherType, error) {
switch op {
case "=":
return models.Configv1MutingRuleLabelMatcherMatcherTypeEXACT, nil
case "=~":
return models.Configv1MutingRuleLabelMatcherMatcherTypeREGEX, nil
case "!=":
return models.Configv1MutingRuleLabelMatcherMatcherTypeNOTEXACT, nil
case "!~":
return models.Configv1MutingRuleLabelMatcherMatcherTypeNOTREGEXP, nil
default:
return models.Configv1MutingRuleLabelMatcherMatcherType(""), fmt.Errorf("invalid matcher %q", op)
}
}