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withdrawal.go
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withdrawal.go
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// Copyright © 2022 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"
"encoding/hex"
"encoding/json"
"fmt"
"strconv"
"strings"
"github.com/attestantio/go-eth2-client/spec/bellatrix"
"github.com/attestantio/go-eth2-client/spec/phase0"
"github.com/goccy/go-yaml"
"github.com/pkg/errors"
)
// Withdrawal provides information about a withdrawal.
type Withdrawal struct {
Index WithdrawalIndex
ValidatorIndex phase0.ValidatorIndex
Address bellatrix.ExecutionAddress `ssz-size:"20"`
Amount phase0.Gwei
}
// withdrawalJSON is an internal representation of the struct.
type withdrawalJSON struct {
Index string `json:"index"`
ValidatorIndex string `json:"validator_index"`
Address string `json:"address"`
Amount string `json:"amount"`
}
// withdrawalYAML is an internal representation of the struct.
type withdrawalYAML struct {
Index uint64 `yaml:"index"`
ValidatorIndex uint64 `yaml:"validator_index"`
Address string `yaml:"address"`
Amount uint64 `yaml:"amount"`
}
// MarshalJSON implements json.Marshaler.
func (w *Withdrawal) MarshalJSON() ([]byte, error) {
return json.Marshal(&withdrawalJSON{
Index: fmt.Sprintf("%d", w.Index),
ValidatorIndex: fmt.Sprintf("%d", w.ValidatorIndex),
Address: fmt.Sprintf("%#x", w.Address),
Amount: fmt.Sprintf("%d", w.Amount),
})
}
// UnmarshalJSON implements json.Unmarshaler.
func (w *Withdrawal) UnmarshalJSON(input []byte) error {
var data withdrawalJSON
err := json.Unmarshal(input, &data)
if err != nil {
return errors.Wrap(err, "invalid JSON")
}
return w.unpack(&data)
}
func (w *Withdrawal) unpack(data *withdrawalJSON) error {
if data.Index == "" {
return errors.New("index missing")
}
index, err := strconv.ParseUint(data.Index, 10, 64)
if err != nil {
return errors.Wrap(err, "invalid value for index")
}
w.Index = WithdrawalIndex(index)
if data.ValidatorIndex == "" {
return errors.New("validator index missing")
}
validatorIndex, err := strconv.ParseUint(data.ValidatorIndex, 10, 64)
if err != nil {
return errors.Wrap(err, "invalid value for validator index")
}
w.ValidatorIndex = phase0.ValidatorIndex(validatorIndex)
if data.Address == "" {
return errors.New("address missing")
}
address, err := hex.DecodeString(strings.TrimPrefix(data.Address, "0x"))
if err != nil {
return errors.Wrap(err, "invalid value for address")
}
if len(address) != bellatrix.ExecutionAddressLength {
return errors.New("incorrect length for address")
}
copy(w.Address[:], address)
if data.Amount == "" {
return errors.New("amount missing")
}
amount, err := strconv.ParseUint(data.Amount, 10, 64)
if err != nil {
return errors.Wrap(err, "invalid value for amount")
}
w.Amount = phase0.Gwei(amount)
return nil
}
// MarshalYAML implements yaml.Marshaler.
func (w *Withdrawal) MarshalYAML() ([]byte, error) {
yamlBytes, err := yaml.MarshalWithOptions(&withdrawalYAML{
Index: uint64(w.Index),
ValidatorIndex: uint64(w.ValidatorIndex),
Address: fmt.Sprintf("%#x", w.Address),
Amount: uint64(w.Amount),
}, yaml.Flow(true))
if err != nil {
return nil, err
}
return bytes.ReplaceAll(yamlBytes, []byte(`"`), []byte(`'`)), nil
}
// UnmarshalYAML implements yaml.Unmarshaler.
func (w *Withdrawal) UnmarshalYAML(input []byte) error {
// We unmarshal to the JSON struct to save on duplicate code.
var data withdrawalJSON
if err := yaml.Unmarshal(input, &data); err != nil {
return err
}
return w.unpack(&data)
}
// String returns a string version of the structure.
func (w *Withdrawal) String() string {
data, err := yaml.Marshal(w)
if err != nil {
return fmt.Sprintf("ERR: %v", err)
}
return string(data)
}