mirror of https://github.com/prometheus/prometheus
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
101 lines
2.4 KiB
101 lines
2.4 KiB
11 years ago
|
// Copyright 2014 Prometheus Team
|
||
|
// 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 metric
|
||
|
|
||
|
import (
|
||
|
"regexp"
|
||
|
|
||
|
clientmodel "github.com/prometheus/client_golang/model"
|
||
|
)
|
||
|
|
||
|
// MatchType is an enum for label matching types.
|
||
|
type MatchType int
|
||
|
|
||
|
// Possible MatchTypes.
|
||
|
const (
|
||
|
Equal MatchType = iota
|
||
|
NotEqual
|
||
|
RegexMatch
|
||
|
RegexNoMatch
|
||
|
)
|
||
|
|
||
|
func (m MatchType) String() string {
|
||
|
typeToStr := map[MatchType]string{
|
||
|
Equal: "=",
|
||
|
NotEqual: "!=",
|
||
|
RegexMatch: "=~",
|
||
|
RegexNoMatch: "!~",
|
||
|
}
|
||
|
if str, ok := typeToStr[m]; ok {
|
||
|
return str
|
||
|
}
|
||
|
panic("unknown match type")
|
||
|
}
|
||
|
|
||
|
// LabelMatchers is a slice of LabelMatcher objects.
|
||
|
type LabelMatchers []*LabelMatcher
|
||
|
|
||
|
// LabelMatcher models the matching of a label.
|
||
|
type LabelMatcher struct {
|
||
|
Type MatchType
|
||
|
Name clientmodel.LabelName
|
||
|
Value clientmodel.LabelValue
|
||
|
re *regexp.Regexp
|
||
|
}
|
||
|
|
||
|
// NewLabelMatcher returns a LabelMatcher object ready to use.
|
||
|
func NewLabelMatcher(matchType MatchType, name clientmodel.LabelName, value clientmodel.LabelValue) (*LabelMatcher, error) {
|
||
|
m := &LabelMatcher{
|
||
|
Type: matchType,
|
||
|
Name: name,
|
||
|
Value: value,
|
||
|
}
|
||
|
if matchType == RegexMatch || matchType == RegexNoMatch {
|
||
|
re, err := regexp.Compile(string(value))
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
m.re = re
|
||
|
}
|
||
|
return m, nil
|
||
|
}
|
||
|
|
||
|
// Match returns true if the label matcher matches the supplied label value.
|
||
|
func (m *LabelMatcher) Match(v clientmodel.LabelValue) bool {
|
||
|
switch m.Type {
|
||
|
case Equal:
|
||
|
return m.Value == v
|
||
|
case NotEqual:
|
||
|
return m.Value != v
|
||
|
case RegexMatch:
|
||
|
return m.re.MatchString(string(v))
|
||
|
case RegexNoMatch:
|
||
|
return !m.re.MatchString(string(v))
|
||
|
default:
|
||
|
panic("invalid match type")
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Filter takes a list of label values and returns all label values which match
|
||
|
// the label matcher.
|
||
|
func (m *LabelMatcher) Filter(in clientmodel.LabelValues) clientmodel.LabelValues {
|
||
|
out := clientmodel.LabelValues{}
|
||
|
for _, v := range in {
|
||
|
if m.Match(v) {
|
||
|
out = append(out, v)
|
||
|
}
|
||
|
}
|
||
|
return out
|
||
|
}
|