85 lines
2.1 KiB
Go
85 lines
2.1 KiB
Go
// Copyright 2018 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 config
|
|
|
|
import (
|
|
"io/ioutil"
|
|
"os"
|
|
|
|
"github.com/prometheus-community/windows_exporter/log"
|
|
"gopkg.in/alecthomas/kingpin.v2"
|
|
"gopkg.in/yaml.v2"
|
|
)
|
|
|
|
type getFlagger interface {
|
|
GetFlag(name string) *kingpin.FlagClause
|
|
}
|
|
|
|
// Resolver represents a configuration file resolver for kingpin.
|
|
type Resolver struct {
|
|
flags map[string]string
|
|
}
|
|
|
|
// NewResolver returns a Resolver structure.
|
|
func NewResolver(file string) (*Resolver, error) {
|
|
flags := map[string]string{}
|
|
log.Infof("Loading configuration file: %v", file)
|
|
if _, err := os.Stat(file); err != nil {
|
|
return nil, err
|
|
}
|
|
b, err := ioutil.ReadFile(file)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
var rawValues map[string]interface{}
|
|
err = yaml.Unmarshal(b, &rawValues)
|
|
if err != nil {
|
|
return nil, 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 (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
|
|
}
|