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store.go
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store.go
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// Copyright 2021 Matt Ho
//
// 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 badgerstore
import (
"context"
"encoding/json"
"fmt"
"sort"
"strconv"
"strings"
"sync/atomic"
"github.com/dgraph-io/badger/v3"
"github.com/thuannguyen2010/ogmigo/ouroboros/chainsync"
)
type Store struct {
db *badger.DB
counter int64
prefix []byte
}
func New(db *badger.DB, prefix string) *Store {
return &Store{
db: db,
prefix: []byte(strings.TrimRight(prefix, "/") + "/"),
}
}
// Save the point; save will be called multiple times and should only
// keep track of the most recent points
func (s *Store) Save(_ context.Context, point chainsync.Point) error {
data, err := json.Marshal(point)
if err != nil {
return fmt.Errorf("failed to save point: %w", err)
}
v := atomic.AddInt64(&s.counter, 1) % 10
key := append(s.prefix, []byte(strconv.FormatInt(v, 10))...)
tx := s.db.NewTransaction(true)
if err := tx.Set(key, data); err != nil {
return fmt.Errorf("failed to save point: set failed: %w", err)
}
if err := tx.Commit(); err != nil {
return fmt.Errorf("failed to save point: commit failed: %w", err)
}
return s.db.Sync()
}
// Load saved points
func (s *Store) Load(context.Context) (chainsync.Points, error) {
tx := s.db.NewTransaction(false)
iter := tx.NewIterator(badger.DefaultIteratorOptions)
defer iter.Close()
var pp chainsync.Points
for iter.Seek(s.prefix); iter.ValidForPrefix(s.prefix); iter.Next() {
var p chainsync.Point
unmarshal := func(val []byte) error { return json.Unmarshal(val, &p) }
if err := iter.Item().Value(unmarshal); err != nil {
return nil, fmt.Errorf("failed to load points: %w", err)
}
pp = append(pp, p)
}
sort.Sort(pp)
return pp, nil
}