106 lines
2.5 KiB
Go
106 lines
2.5 KiB
Go
// Copyright 2014 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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package metric
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import (
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"fmt"
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"regexp"
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"github.com/prometheus/common/model"
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)
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// MatchType is an enum for label matching types.
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type MatchType int
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// Possible MatchTypes.
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const (
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Equal MatchType = iota
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NotEqual
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RegexMatch
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RegexNoMatch
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)
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func (m MatchType) String() string {
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typeToStr := map[MatchType]string{
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Equal: "=",
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NotEqual: "!=",
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RegexMatch: "=~",
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RegexNoMatch: "!~",
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}
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if str, ok := typeToStr[m]; ok {
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return str
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}
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panic("unknown match type")
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}
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// LabelMatchers is a slice of LabelMatcher objects.
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type LabelMatchers []*LabelMatcher
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// LabelMatcher models the matching of a label.
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type LabelMatcher struct {
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Type MatchType
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Name model.LabelName
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Value model.LabelValue
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re *regexp.Regexp
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}
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// NewLabelMatcher returns a LabelMatcher object ready to use.
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func NewLabelMatcher(matchType MatchType, name model.LabelName, value model.LabelValue) (*LabelMatcher, error) {
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m := &LabelMatcher{
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Type: matchType,
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Name: name,
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Value: value,
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}
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if matchType == RegexMatch || matchType == RegexNoMatch {
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re, err := regexp.Compile("^(?:" + string(value) + ")$")
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if err != nil {
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return nil, err
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}
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m.re = re
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}
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return m, nil
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}
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func (m *LabelMatcher) String() string {
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return fmt.Sprintf("%s%s%q", m.Name, m.Type, m.Value)
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}
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// Match returns true if the label matcher matches the supplied label value.
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func (m *LabelMatcher) Match(v model.LabelValue) bool {
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switch m.Type {
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case Equal:
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return m.Value == v
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case NotEqual:
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return m.Value != v
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case RegexMatch:
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return m.re.MatchString(string(v))
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case RegexNoMatch:
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return !m.re.MatchString(string(v))
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default:
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panic("invalid match type")
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}
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}
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// Filter takes a list of label values and returns all label values which match
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// the label matcher.
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func (m *LabelMatcher) Filter(in model.LabelValues) model.LabelValues {
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out := model.LabelValues{}
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for _, v := range in {
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if m.Match(v) {
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out = append(out, v)
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}
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}
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return out
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}
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