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withdrawalindex.go
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/
withdrawalindex.go
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// Copyright © 2022, 2023 Attestant Limited.
// 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 capella
import (
"bytes"
"fmt"
"strconv"
"github.com/pkg/errors"
)
// WithdrawalIndex is the index of a withdrawal operation.
type WithdrawalIndex uint64
// UnmarshalJSON implements json.Unmarshaler.
func (w *WithdrawalIndex) UnmarshalJSON(input []byte) error {
if len(input) == 0 {
return errors.New("input missing")
}
if len(input) < 3 {
return errors.New("input malformed")
}
if !bytes.HasPrefix(input, []byte{'"'}) {
return errors.New("invalid prefix")
}
if !bytes.HasSuffix(input, []byte{'"'}) {
return errors.New("invalid suffix")
}
val, err := strconv.ParseUint(string(input[1:len(input)-1]), 10, 64)
if err != nil {
return errors.Wrapf(err, "invalid value %s", string(input[1:len(input)-1]))
}
*w = WithdrawalIndex(val)
return nil
}
// MarshalJSON implements json.Marshaler.
func (w WithdrawalIndex) MarshalJSON() ([]byte, error) {
return []byte(fmt.Sprintf(`"%d"`, w)), nil
}