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attestationdata.go
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attestationdata.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"
)
// AttestationData is the Ethereum 2 specification structure.
type AttestationData struct {
Slot Slot
Index CommitteeIndex
BeaconBlockRoot Root `ssz-size:"32"`
Source *Checkpoint
Target *Checkpoint
}
// attestationDataJSON is an internal representation of the struct.
type attestationDataJSON struct {
Slot string `json:"slot"`
Index string `json:"index"`
BeaconBlockRoot string `json:"beacon_block_root"`
Source *Checkpoint `json:"source"`
Target *Checkpoint `json:"target"`
}
// attestationDataYAML is an internal representation of the struct.
type attestationDataYAML struct {
Slot uint64 `yaml:"slot"`
Index uint64 `yaml:"index"`
BeaconBlockRoot string `yaml:"beacon_block_root"`
Source *Checkpoint `json:"source"`
Target *Checkpoint `json:"target"`
}
// MarshalJSON implements json.Marshaler.
func (a *AttestationData) MarshalJSON() ([]byte, error) {
return json.Marshal(&attestationDataJSON{
Slot: fmt.Sprintf("%d", a.Slot),
Index: fmt.Sprintf("%d", a.Index),
BeaconBlockRoot: fmt.Sprintf("%#x", a.BeaconBlockRoot),
Source: a.Source,
Target: a.Target,
})
}
// UnmarshalJSON implements json.Unmarshaler.
func (a *AttestationData) UnmarshalJSON(input []byte) error {
var attestationDataJSON attestationDataJSON
if err := json.Unmarshal(input, &attestationDataJSON); err != nil {
return errors.Wrap(err, "invalid JSON")
}
return a.unpack(&attestationDataJSON)
}
func (a *AttestationData) unpack(attestationDataJSON *attestationDataJSON) error {
if attestationDataJSON.Slot == "" {
return errors.New("slot missing")
}
slot, err := strconv.ParseUint(attestationDataJSON.Slot, 10, 64)
if err != nil {
return errors.Wrap(err, "invalid value for slot")
}
a.Slot = Slot(slot)
if attestationDataJSON.Index == "" {
return errors.New("index missing")
}
index, err := strconv.ParseUint(attestationDataJSON.Index, 10, 64)
if err != nil {
return errors.Wrap(err, "invalid value for index")
}
a.Index = CommitteeIndex(index)
if attestationDataJSON.BeaconBlockRoot == "" {
return errors.New("beacon block root missing")
}
beaconBlockRoot, err := hex.DecodeString(strings.TrimPrefix(attestationDataJSON.BeaconBlockRoot, "0x"))
if err != nil {
return errors.Wrap(err, "invalid value for beacon block root")
}
if len(beaconBlockRoot) != RootLength {
return errors.New("incorrect length for beacon block root")
}
copy(a.BeaconBlockRoot[:], beaconBlockRoot)
if attestationDataJSON.Source == nil {
return errors.New("source missing")
}
a.Source = attestationDataJSON.Source
if attestationDataJSON.Target == nil {
return errors.New("target missing")
}
a.Target = attestationDataJSON.Target
return nil
}
// MarshalYAML implements yaml.Marshaler.
func (a *AttestationData) MarshalYAML() ([]byte, error) {
yamlBytes, err := yaml.MarshalWithOptions(&attestationDataYAML{
Slot: uint64(a.Slot),
Index: uint64(a.Index),
BeaconBlockRoot: fmt.Sprintf("%#x", a.BeaconBlockRoot),
Source: a.Source,
Target: a.Target,
}, yaml.Flow(true))
if err != nil {
return nil, err
}
return bytes.ReplaceAll(yamlBytes, []byte(`"`), []byte(`'`)), nil
}
// UnmarshalYAML implements yaml.Unmarshaler.
func (a *AttestationData) UnmarshalYAML(input []byte) error {
// We unmarshal to the JSON struct to save on duplicate code.
var attestationDataJSON attestationDataJSON
if err := yaml.Unmarshal(input, &attestationDataJSON); err != nil {
return err
}
return a.unpack(&attestationDataJSON)
}
// String provids a string representation of the struct.
func (a *AttestationData) String() string {
data, err := yaml.Marshal(a)
if err != nil {
return fmt.Sprintf("ERR: %v", err)
}
return string(data)
}