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parser.go
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parser.go
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// Copyright 2022 CloudWeGo 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.
//
package configparser
import (
"fmt"
"github.com/spf13/viper"
)
// Parser loads configuration.
type Parser struct {
v *viper.Viper
}
func newViper() *viper.Viper {
return viper.NewWithOptions()
}
// UnmarshalExact unmarshals the config into a struct, erroring if a field is nonexistent.
func (l *Parser) UnmarshalExact(intoCfg interface{}) error {
return l.v.UnmarshalExact(intoCfg)
}
// NewParserFromFile creates a new Parser by reading the given file.
func NewParserFromFile(fileName string) (*Parser, error) {
v := newViper()
v.SetConfigFile(fileName)
if err := v.ReadInConfig(); err != nil {
return nil, fmt.Errorf("unable to read the file %v: %w", fileName, err)
}
return &Parser{v: v}, nil
}