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syncstate.go
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syncstate.go
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// Copyright © 2020, 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 v1
import (
"encoding/json"
"fmt"
"strconv"
"github.com/attestantio/go-eth2-client/spec/phase0"
"github.com/pkg/errors"
)
// SyncState is the data regarding the node's synchronization state to the chain.
type SyncState struct {
// HeadSlot is the head slot of the chain as understood by the node.
HeadSlot phase0.Slot
// SyncDistance is the distance between the node's highest synced slot and the head slot.
SyncDistance phase0.Slot
// IsOptimistic is true if the node is optimistic.
IsOptimistic bool
// IsSyncing is true if the node is syncing.
IsSyncing bool
}
// syncStateJSON is the spec representation of the struct.
type syncStateJSON struct {
HeadSlot string `json:"head_slot"`
SyncDistance string `json:"sync_distance"`
IsOptimistic bool `json:"is_optimistic"`
IsSyncing bool `json:"is_syncing"`
}
// MarshalJSON implements json.Marshaler.
func (s *SyncState) MarshalJSON() ([]byte, error) {
return json.Marshal(&syncStateJSON{
HeadSlot: fmt.Sprintf("%d", s.HeadSlot),
SyncDistance: fmt.Sprintf("%d", s.SyncDistance),
IsOptimistic: s.IsOptimistic,
IsSyncing: s.IsSyncing,
})
}
// UnmarshalJSON implements json.Unmarshaler.
func (s *SyncState) UnmarshalJSON(input []byte) error {
var err error
var syncStateJSON syncStateJSON
if err = json.Unmarshal(input, &syncStateJSON); err != nil {
return errors.Wrap(err, "invalid JSON")
}
if syncStateJSON.HeadSlot == "" {
return errors.New("head slot missing")
}
headSlot, err := strconv.ParseUint(syncStateJSON.HeadSlot, 10, 64)
if err != nil {
return errors.Wrap(err, "invalid value for head slot")
}
s.HeadSlot = phase0.Slot(headSlot)
if syncStateJSON.SyncDistance == "" {
return errors.New("sync distance missing")
}
syncDistance, err := strconv.ParseUint(syncStateJSON.SyncDistance, 10, 64)
if err != nil {
return errors.Wrap(err, "invalid value for sync distance")
}
s.SyncDistance = phase0.Slot(syncDistance)
s.IsOptimistic = syncStateJSON.IsOptimistic
s.IsSyncing = syncStateJSON.IsSyncing
return nil
}
// String returns a string version of the structure.
func (s *SyncState) String() string {
data, err := json.Marshal(s)
if err != nil {
return fmt.Sprintf("ERR: %v", err)
}
return string(data)
}