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eth1data.go
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eth1data.go
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// Copyright © 2020 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 phase0
import (
"bytes"
"encoding/hex"
"encoding/json"
"fmt"
"strconv"
"strings"
"github.com/goccy/go-yaml"
"github.com/pkg/errors"
)
// ETH1Data provides information about the state of Ethereum 1 as viewed by the
// Ethereum 2 chain.
type ETH1Data struct {
DepositRoot Root `ssz-size:"32"`
DepositCount uint64
BlockHash []byte `ssz-size:"32"`
}
// eth1DataJSON is the spec representation of the struct.
type eth1DataJSON struct {
DepositRoot string `json:"deposit_root"`
DepositCount string `json:"deposit_count"`
BlockHash string `json:"block_hash"`
}
// eth1DataYAML is the spec representation of the struct.
type eth1DataYAML struct {
DepositRoot string `yaml:"deposit_root"`
DepositCount uint64 `yaml:"deposit_count"`
BlockHash string `yaml:"block_hash"`
}
// MarshalJSON implements json.Marshaler.
func (e *ETH1Data) MarshalJSON() ([]byte, error) {
return json.Marshal(ð1DataJSON{
DepositRoot: fmt.Sprintf("%#x", e.DepositRoot),
DepositCount: fmt.Sprintf("%d", e.DepositCount),
BlockHash: fmt.Sprintf("%#x", e.BlockHash),
})
}
// UnmarshalJSON implements json.Unmarshaler.
func (e *ETH1Data) UnmarshalJSON(input []byte) error {
var eth1DataJSON eth1DataJSON
if err := json.Unmarshal(input, ð1DataJSON); err != nil {
return errors.Wrap(err, "invalid JSON")
}
return e.unpack(ð1DataJSON)
}
func (e *ETH1Data) unpack(eth1DataJSON *eth1DataJSON) error {
if eth1DataJSON.DepositRoot == "" {
return errors.New("deposit root missing")
}
depositRoot, err := hex.DecodeString(strings.TrimPrefix(eth1DataJSON.DepositRoot, "0x"))
if err != nil {
return errors.Wrap(err, "invalid value for deposit root")
}
if len(depositRoot) != RootLength {
return errors.New("incorrect length for deposit root")
}
copy(e.DepositRoot[:], depositRoot)
if eth1DataJSON.DepositCount == "" {
return errors.New("deposit count missing")
}
if e.DepositCount, err = strconv.ParseUint(eth1DataJSON.DepositCount, 10, 64); err != nil {
return errors.Wrap(err, "invalid value for deposit count")
}
if eth1DataJSON.BlockHash == "" {
return errors.New("block hash missing")
}
if e.BlockHash, err = hex.DecodeString(strings.TrimPrefix(eth1DataJSON.BlockHash, "0x")); err != nil {
return errors.Wrap(err, "invalid value for block hash")
}
if len(e.BlockHash) != HashLength {
return errors.New("incorrect length for block hash")
}
return nil
}
// MarshalYAML implements yaml.Marshaler.
func (e *ETH1Data) MarshalYAML() ([]byte, error) {
yamlBytes, err := yaml.MarshalWithOptions(ð1DataYAML{
DepositRoot: fmt.Sprintf("%#x", e.DepositRoot),
DepositCount: e.DepositCount,
BlockHash: fmt.Sprintf("%#x", e.BlockHash),
}, yaml.Flow(true))
if err != nil {
return nil, err
}
return bytes.ReplaceAll(yamlBytes, []byte(`"`), []byte(`'`)), nil
}
// UnmarshalYAML implements yaml.Unmarshaler.
func (e *ETH1Data) UnmarshalYAML(input []byte) error {
// We unmarshal to the JSON struct to save on duplicate code.
var eth1DataJSON eth1DataJSON
if err := yaml.Unmarshal(input, ð1DataJSON); err != nil {
return err
}
return e.unpack(ð1DataJSON)
}
// String returns a string version of the structure.
func (e *ETH1Data) String() string {
data, err := json.Marshal(e)
if err != nil {
return fmt.Sprintf("ERR: %v", err)
}
return string(data)
}