/
util.go
85 lines (70 loc) · 2.08 KB
/
util.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. 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 flag
import (
"encoding/json"
"github.com/elastic/go-ucfg"
"github.com/elastic/go-ucfg/cfgutil"
)
type FlagValue struct {
collector *cfgutil.Collector
loader func(arg string) (*ucfg.Config, error, error)
}
func newFlagValue(
cfg *ucfg.Config,
opts []ucfg.Option,
loader func(string) (*ucfg.Config, error, error),
) *FlagValue {
return &FlagValue{
collector: cfgutil.NewCollector(cfg, opts...),
loader: loader,
}
}
func (v *FlagValue) Config() *ucfg.Config {
return v.collector.Config()
}
func (v *FlagValue) Error() error {
return v.collector.Error()
}
func (v *FlagValue) String() string {
if v.collector == nil {
return ""
}
return toString(v.Config(), v.collector.GetOptions(), v.onError)
}
func (v *FlagValue) Get() interface{} {
return v.Config()
}
func (v *FlagValue) Set(arg string) error {
cfg, internalErr, reportErr := v.loader(arg)
v.collector.Add(cfg, internalErr)
return reportErr
}
func (v *FlagValue) onError(err error) error {
return v.collector.Add(nil, err)
}
func toString(cfg *ucfg.Config, opts []ucfg.Option, onError func(error) error) string {
var tmp map[string]interface{}
if err := cfg.Unpack(&tmp, opts...); err != nil {
return onError(err).Error()
}
js, err := json.Marshal(tmp)
if err != nil {
return onError(err).Error()
}
return string(js)
}