mirror of
https://github.com/prometheus-community/windows_exporter.git
synced 2026-02-10 06:56:38 +00:00
152 lines
3.5 KiB
Go
152 lines
3.5 KiB
Go
// SPDX-License-Identifier: Apache-2.0
|
|
//
|
|
// Copyright 2025 The Prometheus Authors
|
|
// 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.
|
|
|
|
//go:build windows
|
|
|
|
package config
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
"strings"
|
|
|
|
"github.com/alecthomas/kingpin/v2"
|
|
"gopkg.in/yaml.v3"
|
|
)
|
|
|
|
type getFlagger interface {
|
|
GetFlag(name string) *kingpin.FlagClause
|
|
}
|
|
|
|
// Resolver represents a configuration file resolver for kingpin.
|
|
type Resolver struct {
|
|
flags map[string]string
|
|
}
|
|
|
|
// Parse parses the command line arguments and configuration files.
|
|
func Parse(app *kingpin.Application, args []string) error {
|
|
configFile := ParseConfigFile(args)
|
|
if configFile != "" {
|
|
resolver, err := NewConfigFileResolver(configFile)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to load configuration file: %w", err)
|
|
}
|
|
|
|
if err = resolver.Bind(app, args); err != nil {
|
|
return fmt.Errorf("failed to bind configuration: %w", err)
|
|
}
|
|
}
|
|
|
|
if _, err := app.Parse(args); err != nil {
|
|
return fmt.Errorf("failed to parse flags: %w", err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// ParseConfigFile manually parses the configuration file from the command line arguments.
|
|
func ParseConfigFile(args []string) string {
|
|
for i, cliFlag := range args {
|
|
if strings.HasPrefix(cliFlag, "--config.file=") {
|
|
return strings.TrimPrefix(cliFlag, "--config.file=")
|
|
}
|
|
|
|
if strings.HasPrefix(cliFlag, "-config.file=") {
|
|
return strings.TrimPrefix(cliFlag, "-config.file=")
|
|
}
|
|
|
|
if strings.HasSuffix(cliFlag, "-config.file") {
|
|
if len(os.Args) <= i+1 {
|
|
return ""
|
|
}
|
|
|
|
return os.Args[i+1]
|
|
}
|
|
}
|
|
|
|
return ""
|
|
}
|
|
|
|
// NewConfigFileResolver returns a Resolver structure.
|
|
func NewConfigFileResolver(file string) (*Resolver, error) {
|
|
flags := map[string]string{}
|
|
|
|
var (
|
|
err error
|
|
fileBytes []byte
|
|
)
|
|
|
|
fileBytes, err = readFromFile(file)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
var rawValues map[string]interface{}
|
|
|
|
err = yaml.Unmarshal(fileBytes, &rawValues)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to unmarshal configuration file: %w", err)
|
|
}
|
|
|
|
// Flatten nested YAML values
|
|
flattenedValues := flatten(rawValues)
|
|
for k, v := range flattenedValues {
|
|
if _, ok := flags[k]; !ok {
|
|
flags[k] = v
|
|
}
|
|
}
|
|
|
|
return &Resolver{flags: flags}, nil
|
|
}
|
|
|
|
func readFromFile(file string) ([]byte, error) {
|
|
if _, err := os.Stat(file); err != nil {
|
|
return nil, fmt.Errorf("failed to read configuration file: %w", err)
|
|
}
|
|
|
|
fileBytes, err := os.ReadFile(file)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to read configuration file: %w", err)
|
|
}
|
|
|
|
return fileBytes, nil
|
|
}
|
|
|
|
func (c *Resolver) setDefault(v getFlagger) {
|
|
for name, value := range c.flags {
|
|
f := v.GetFlag(name)
|
|
if f != nil {
|
|
f.Default(value)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Bind sets active flags with their default values from the configuration file(s).
|
|
func (c *Resolver) Bind(app *kingpin.Application, args []string) error {
|
|
// Parse the command line arguments to get the selected command.
|
|
pc, err := app.ParseContext(args)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
c.setDefault(app)
|
|
|
|
if pc.SelectedCommand != nil {
|
|
c.setDefault(pc.SelectedCommand)
|
|
}
|
|
|
|
return nil
|
|
}
|