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syncaggregate.go
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syncaggregate.go
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// Copyright © 2021 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 altair
import (
"bytes"
"encoding/hex"
"encoding/json"
"fmt"
"strings"
"github.com/attestantio/go-eth2-client/spec/phase0"
"github.com/goccy/go-yaml"
"github.com/pkg/errors"
bitfield "github.com/prysmaticlabs/go-bitfield"
)
// SyncAggregate is the Ethereum 2 sync aggregate structure.
type SyncAggregate struct {
SyncCommitteeBits bitfield.Bitvector512 `ssz-size:"64"`
SyncCommitteeSignature phase0.BLSSignature `ssz-size:"96"`
}
// syncAggregateJSON is the spec representation of the struct.
type syncAggregateJSON struct {
SyncCommitteeBits string `json:"sync_committee_bits"`
SyncCommitteeSignature string `json:"sync_committee_signature"`
}
// syncAggregateYAML is the spec representation of the struct.
type syncAggregateYAML struct {
SyncCommitteeBits string `yaml:"sync_committee_bits"`
SyncCommitteeSignature string `yaml:"sync_committee_signature"`
}
// MarshalJSON implements json.Marshaler.
func (s *SyncAggregate) MarshalJSON() ([]byte, error) {
return json.Marshal(&syncAggregateJSON{
SyncCommitteeBits: fmt.Sprintf("%#x", s.SyncCommitteeBits.Bytes()),
SyncCommitteeSignature: fmt.Sprintf("%#x", s.SyncCommitteeSignature),
})
}
// UnmarshalJSON implements json.Unmarshaler.
func (s *SyncAggregate) UnmarshalJSON(input []byte) error {
var syncAggregateJSON syncAggregateJSON
if err := json.Unmarshal(input, &syncAggregateJSON); err != nil {
return errors.Wrap(err, "invalid JSON")
}
return s.unpack(&syncAggregateJSON)
}
func (s *SyncAggregate) unpack(syncAggregateJSON *syncAggregateJSON) error {
if syncAggregateJSON.SyncCommitteeBits == "" {
return errors.New("sync committee bits missing")
}
syncCommitteeBits, err := hex.DecodeString(strings.TrimPrefix(syncAggregateJSON.SyncCommitteeBits, "0x"))
if err != nil {
return errors.Wrap(err, "invalid value for sync committee bits")
}
if len(syncCommitteeBits) < syncCommitteeSize/8 {
return errors.New("sync committee bits too short")
}
if len(syncCommitteeBits) > syncCommitteeSize/8 {
return errors.New("sync committee bits too long")
}
s.SyncCommitteeBits = syncCommitteeBits
if syncAggregateJSON.SyncCommitteeSignature == "" {
return errors.New("sync committee signature missing")
}
syncCommitteeSignature, err := hex.DecodeString(strings.TrimPrefix(syncAggregateJSON.SyncCommitteeSignature, "0x"))
if err != nil {
return errors.Wrap(err, "invalid value for sync committee signature")
}
if len(syncCommitteeSignature) < 96 {
return errors.New("sync committee signature short")
}
if len(syncCommitteeSignature) > 96 {
return errors.New("sync committee signature long")
}
copy(s.SyncCommitteeSignature[:], syncCommitteeSignature)
return nil
}
// MarshalYAML implements yaml.Marshaler.
func (s *SyncAggregate) MarshalYAML() ([]byte, error) {
yamlBytes, err := yaml.MarshalWithOptions(&syncAggregateYAML{
SyncCommitteeBits: fmt.Sprintf("%#x", s.SyncCommitteeBits.Bytes()),
SyncCommitteeSignature: fmt.Sprintf("%#x", s.SyncCommitteeSignature),
}, yaml.Flow(true))
if err != nil {
return nil, err
}
return bytes.ReplaceAll(yamlBytes, []byte(`"`), []byte(`'`)), nil
}
// UnmarshalYAML implements yaml.Unmarshaler.
func (s *SyncAggregate) UnmarshalYAML(input []byte) error {
// We unmarshal to the JSON struct to save on duplicate code.
var syncAggregateJSON syncAggregateJSON
if err := yaml.Unmarshal(input, &syncAggregateJSON); err != nil {
return err
}
return s.unpack(&syncAggregateJSON)
}
// String returns a string version of the structure.
func (s *SyncAggregate) String() string {
data, err := yaml.Marshal(s)
if err != nil {
return fmt.Sprintf("ERR: %v", err)
}
return string(data)
}