mirror of
https://github.com/prometheus-community/windows_exporter.git
synced 2026-10-17 10:09:05 +02:00
100 lines
3.3 KiB
Go
100 lines
3.3 KiB
Go
// SPDX-License-Identifier: Apache-2.0
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//
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// Copyright 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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//go:build windows
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package utils
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import (
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"fmt"
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"regexp"
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"slices"
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"github.com/alecthomas/kingpin/v2"
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"github.com/prometheus-community/windows_exporter/internal/types"
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)
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//nolint:gochecknoglobals
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var (
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// matchAllExpressions are the expressions of an include filter that matches every name.
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matchAllExpressions = []string{anchor(".+"), anchor(".*"), types.RegExpAny.String()}
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// matchNoneExpressions are the expressions of an exclude filter that matches no name.
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matchNoneExpressions = []string{anchor(""), types.RegExpEmpty.String()}
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)
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// anchor wraps expr, so that it must match the whole input.
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func anchor(expr string) string {
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return "^(?:" + expr + ")$"
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}
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// CompileAnchored compiles expr, so that it must match the whole input.
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func CompileAnchored(expr string) (*regexp.Regexp, error) {
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return regexp.Compile(anchor(expr))
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}
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// MustCompileAnchored is like [CompileAnchored], but panics if expr can't be parsed.
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func MustCompileAnchored(expr string) *regexp.Regexp {
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return regexp.MustCompile(anchor(expr))
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}
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// IsMatchAll reports whether re is an include filter that matches every name:
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// the default of an include flag, [types.RegExpAny] or nil, which the New function of
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// a collector replaces with the default.
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func IsMatchAll(re *regexp.Regexp) bool {
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return re == nil || slices.Contains(matchAllExpressions, re.String())
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}
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// IsMatchNone reports whether re is an exclude filter that matches no name:
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// the default of an exclude flag, [types.RegExpEmpty] or nil, which the New function
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// of a collector replaces with the default.
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func IsMatchNone(re *regexp.Regexp) bool {
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return re == nil || slices.Contains(matchNoneExpressions, re.String())
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}
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// anchoredRegexpValue is a [kingpin.Value] which compiles its value with [CompileAnchored].
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type anchoredRegexpValue struct {
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name string
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expr string
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target **regexp.Regexp
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}
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func (v *anchoredRegexpValue) Set(expr string) error {
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re, err := CompileAnchored(expr)
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if err != nil {
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return fmt.Errorf("%s: %w", v.name, err)
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}
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v.expr = expr
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*v.target = re
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return nil
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}
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func (v *anchoredRegexpValue) String() string {
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return v.expr
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}
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// RegexpFlag registers the flag name, whose value is a regular expression that
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// must match the whole name. The compiled expression is stored in target when
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// the flags are parsed, including the default and a value from the
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// configuration file. An invalid expression fails the parsing with an error
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// that starts with the name of the flag.
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func RegexpFlag(app *kingpin.Application, name, help, defaultValue string, target **regexp.Regexp) *kingpin.FlagClause {
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flag := app.Flag(name, help).Default(defaultValue)
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flag.SetValue(&anchoredRegexpValue{name: name, target: target})
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return flag
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}
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