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flag.go
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flag.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 conf
import (
"flag"
"os"
"reflect"
"time"
)
type flagResolver struct {
args []string
flagSet *flag.FlagSet
}
func (r *flagResolver) init(p interface{}) {
if r.args == nil {
r.args = os.Args[1:]
}
if r.flagSet == nil {
r.flagSet = flag.NewFlagSet("flag", flag.ContinueOnError)
}
flagSet := r.flagSet
visitExportedFields(p, func(path string, f reflect.StructField, v reflect.Value) {
flagName := flagStyle(path)
vi := v.Addr().Interface()
vt := v.Type()
switch vt {
case reflect.TypeOf(time.Nanosecond):
flagSet.DurationVar(vi.(*time.Duration), flagName, time.Duration(v.Int()), path)
default:
switch k := vt.Kind(); k {
case reflect.Bool:
flagSet.BoolVar(vi.(*bool), flagName, v.Bool(), path)
case reflect.Float64:
flagSet.Float64Var(vi.(*float64), flagName, v.Float(), path)
case reflect.Int:
flagSet.IntVar(vi.(*int), flagName, int(v.Int()), path)
case reflect.Int64:
flagSet.Int64Var(vi.(*int64), flagName, v.Int(), path)
case reflect.String:
flagSet.StringVar(vi.(*string), flagName, v.String(), path)
case reflect.Uint:
flagSet.UintVar(vi.(*uint), flagName, uint(v.Uint()), path)
case reflect.Uint64:
flagSet.Uint64Var(vi.(*uint64), flagName, v.Uint(), path)
default:
}
}
})
}
func (r *flagResolver) Resolve(p interface{}) error {
flagSet := r.flagSet
return flagSet.Parse(r.args)
}