/
repository_checkpoint.go
54 lines (45 loc) · 1.53 KB
/
repository_checkpoint.go
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// Copyright 2020 The klaytn Authors
// This file is part of the klaytn library.
//
// The klaytn library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The klaytn library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the klaytn library. If not, see <http://www.gnu.org/licenses/>.
package kas
import (
"errors"
"github.com/jinzhu/gorm"
)
const checkpointKey = "checkpoint"
func (r *repository) WriteCheckpoint(checkpoint int64) error {
data := &FetcherMetadata{
Key: checkpointKey,
Value: checkpoint,
}
return r.db.Save(data).Error
}
func (r *repository) ReadCheckpoint() (int64, error) {
checkpoint, err := r.readCheckpoint()
if r.isRecordNotFoundError(err) {
return 0, nil
}
return checkpoint, err
}
func (r *repository) readCheckpoint() (int64, error) {
data := &FetcherMetadata{}
if err := r.db.Where("`key` = ?", checkpointKey).First(data).Error; err != nil {
return 0, err
}
return data.Value, nil
}
func (r *repository) isRecordNotFoundError(err error) bool {
return errors.Is(err, gorm.ErrRecordNotFound) || gorm.IsRecordNotFoundError(err)
}