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110 lines
3.3 KiB
Go
110 lines
3.3 KiB
Go
// Copyright 2017 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 labels
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import (
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"fmt"
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"regexp"
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)
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// Selector holds constraints for matching against a label set.
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type Selector []Matcher
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// Matches returns whether the labels satisfy all matchers.
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func (s Selector) Matches(labels Labels) bool {
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for _, m := range s {
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if v := labels.Get(m.Name()); !m.Matches(v) {
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return false
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}
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}
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return true
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}
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// Matcher specifies a constraint for the value of a label.
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type Matcher interface {
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// Name returns the label name the matcher should apply to.
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Name() string
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// Matches checks whether a value fulfills the constraints.
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Matches(v string) bool
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// String returns a human readable matcher.
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String() string
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}
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// EqualMatcher matches on equality.
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type EqualMatcher struct {
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name, value string
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}
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// Name implements Matcher interface.
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func (m EqualMatcher) Name() string { return m.name }
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// Matches implements Matcher interface.
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func (m EqualMatcher) Matches(v string) bool { return v == m.value }
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// String implements Matcher interface.
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func (m EqualMatcher) String() string { return fmt.Sprintf("%s=%q", m.name, m.value) }
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// Value returns the matched value.
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func (m EqualMatcher) Value() string { return m.value }
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// NewEqualMatcher returns a new matcher matching an exact label value.
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func NewEqualMatcher(name, value string) Matcher {
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return &EqualMatcher{name: name, value: value}
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}
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type RegexpMatcher struct {
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name string
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re *regexp.Regexp
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}
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func (m RegexpMatcher) Name() string { return m.name }
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func (m RegexpMatcher) Matches(v string) bool { return m.re.MatchString(v) }
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func (m RegexpMatcher) String() string { return fmt.Sprintf("%s=~%q", m.name, m.re.String()) }
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func (m RegexpMatcher) Value() string { return m.re.String() }
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// NewRegexpMatcher returns a new matcher verifying that a value matches
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// the regular expression pattern.
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func NewRegexpMatcher(name, pattern string) (Matcher, error) {
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re, err := regexp.Compile(pattern)
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if err != nil {
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return nil, err
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}
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return &RegexpMatcher{name: name, re: re}, nil
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}
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// NewMustRegexpMatcher returns a new matcher verifying that a value matches
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// the regular expression pattern. Will panic if the pattern is not a valid
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// regular expression.
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func NewMustRegexpMatcher(name, pattern string) Matcher {
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re, err := regexp.Compile(pattern)
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if err != nil {
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panic(err)
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}
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return &RegexpMatcher{name: name, re: re}
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}
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// NotMatcher inverts the matching result for a matcher.
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type NotMatcher struct {
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Matcher
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}
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func (m NotMatcher) Matches(v string) bool { return !m.Matcher.Matches(v) }
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func (m NotMatcher) String() string { return fmt.Sprintf("not(%s)", m.Matcher.String()) }
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// Not inverts the matcher's matching result.
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func Not(m Matcher) Matcher {
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return &NotMatcher{m}
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}
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