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fork.go
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fork.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"
)
// Fork provides information about a fork.
type Fork struct {
// Previous version is the previous fork version.
PreviousVersion Version `ssz-size:"4"`
// Current version is the current fork version.
CurrentVersion Version `ssz-size:"4"`
// Epoch is the epoch at which the current fork version took effect.
Epoch Epoch
}
// forkJSON is the spec representation of the struct.
type forkJSON struct {
PreviousVersion string `json:"previous_version"`
CurrentVersion string `json:"current_version"`
Epoch string `json:"epoch"`
}
// forkYAML is the spec representation of the struct.
type forkYAML struct {
PreviousVersion string `yaml:"previous_version"`
CurrentVersion string `yaml:"current_version"`
Epoch uint64 `yaml:"epoch"`
}
// MarshalJSON implements json.Marshaler.
func (f *Fork) MarshalJSON() ([]byte, error) {
return json.Marshal(&forkJSON{
PreviousVersion: fmt.Sprintf("%#x", f.PreviousVersion),
CurrentVersion: fmt.Sprintf("%#x", f.CurrentVersion),
Epoch: fmt.Sprintf("%d", f.Epoch),
})
}
// UnmarshalJSON implements json.Unmarshaler.
func (f *Fork) UnmarshalJSON(input []byte) error {
var forkJSON forkJSON
if err := json.Unmarshal(input, &forkJSON); err != nil {
return errors.Wrap(err, "invalid JSON")
}
return f.unpack(&forkJSON)
}
func (f *Fork) unpack(forkJSON *forkJSON) error {
if forkJSON.PreviousVersion == "" {
return errors.New("previous version missing")
}
previousVersion, err := hex.DecodeString(strings.TrimPrefix(forkJSON.PreviousVersion, "0x"))
if err != nil {
return errors.Wrap(err, "invalid value for previous version")
}
if len(previousVersion) != ForkVersionLength {
return errors.New("incorrect length for previous version")
}
copy(f.PreviousVersion[:], previousVersion)
if forkJSON.CurrentVersion == "" {
return errors.New("current version missing")
}
currentVersion, err := hex.DecodeString(strings.TrimPrefix(forkJSON.CurrentVersion, "0x"))
if err != nil {
return errors.Wrap(err, "invalid value for current version")
}
if len(currentVersion) != ForkVersionLength {
return errors.New("incorrect length for current version")
}
copy(f.CurrentVersion[:], currentVersion)
if forkJSON.Epoch == "" {
return errors.New("epoch missing")
}
epoch, err := strconv.ParseUint(forkJSON.Epoch, 10, 64)
if err != nil {
return errors.Wrap(err, "invalid value for epoch")
}
f.Epoch = Epoch(epoch)
return nil
}
// MarshalYAML implements yaml.Marshaler.
func (f *Fork) MarshalYAML() ([]byte, error) {
yamlBytes, err := yaml.MarshalWithOptions(&forkYAML{
PreviousVersion: fmt.Sprintf("%#x", f.PreviousVersion),
CurrentVersion: fmt.Sprintf("%#x", f.CurrentVersion),
Epoch: uint64(f.Epoch),
}, yaml.Flow(true))
if err != nil {
return nil, err
}
return bytes.ReplaceAll(yamlBytes, []byte(`"`), []byte(`'`)), nil
}
// UnmarshalYAML implements yaml.Unmarshaler.
func (f *Fork) UnmarshalYAML(input []byte) error {
// We unmarshal to the JSON struct to save on duplicate code.
var forkJSON forkJSON
if err := yaml.Unmarshal(input, &forkJSON); err != nil {
return err
}
return f.unpack(&forkJSON)
}
// String returns a string version of the structure.
func (f *Fork) String() string {
data, err := yaml.Marshal(f)
if err != nil {
return fmt.Sprintf("ERR: %v", err)
}
return string(data)
}