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33c1171b9c
Instead, just make the anchoring part of the internal regex. This helps because some users will want to read back the `Value` field and expect it to be the same as the input value (e.g. some tests in Cortex), or use the value in another context which is already expected to add its own anchoring, leading to superfluous double anchoring (such as when we translate matchers into remote read request matchers).
89 lines
1.9 KiB
Go
89 lines
1.9 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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// 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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MatchEqual MatchType = iota
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MatchNotEqual
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MatchRegexp
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MatchNotRegexp
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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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MatchEqual: "=",
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MatchNotEqual: "!=",
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MatchRegexp: "=~",
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MatchNotRegexp: "!~",
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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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// Matcher models the matching of a label.
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type Matcher struct {
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Type MatchType
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Name string
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Value string
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re *regexp.Regexp
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}
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// NewMatcher returns a matcher object.
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func NewMatcher(t MatchType, n, v string) (*Matcher, error) {
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m := &Matcher{
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Type: t,
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Name: n,
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Value: v,
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}
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if t == MatchRegexp || t == MatchNotRegexp {
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re, err := regexp.Compile("^(?:" + v + ")$")
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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 *Matcher) 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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// Matches returns whether the matcher matches the given string value.
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func (m *Matcher) Matches(s string) bool {
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switch m.Type {
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case MatchEqual:
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return s == m.Value
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case MatchNotEqual:
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return s != m.Value
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case MatchRegexp:
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return m.re.MatchString(s)
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case MatchNotRegexp:
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return !m.re.MatchString(s)
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}
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panic("labels.Matcher.Matches: invalid match type")
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}
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