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store.go
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store.go
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package main
import (
"context"
"encoding/binary"
"log"
"math"
"os"
"path/filepath"
"time"
"github.com/attestantio/go-eth2-client/spec"
"github.com/attestantio/go-eth2-client/spec/altair"
"github.com/attestantio/go-eth2-client/spec/bellatrix"
"github.com/attestantio/go-eth2-client/spec/phase0"
"github.com/dgraph-io/badger/v3"
"github.com/klauspost/compress/snappy"
)
const (
gcInterval = 30 * time.Minute
)
var (
keyBoundaries = []byte{0}
keySlot = []byte{1}
)
type Store struct {
db *badger.DB
ctx context.Context
cancel func()
}
func OpenStore(dir, network string) (*Store, error) {
if err := os.MkdirAll(dir, 0755); err != nil {
return nil, err
}
opt := badger.DefaultOptions(filepath.Join(dir, network))
opt.Logger = nil
db, err := badger.Open(opt)
if err != nil {
return nil, err
}
s := &Store{
db: db,
}
s.ctx, s.cancel = context.WithCancel(context.Background())
// Garbage collection.
go s.gc()
return s, nil
}
func (s *Store) gc() {
ticker := time.NewTicker(gcInterval)
defer ticker.Stop()
for {
start := time.Now()
err := s.db.RunValueLogGC(0.7)
if err != nil {
log.Printf("Error running value log GC: %v", err)
}
log.Printf("BadgerDB GC took %v", time.Since(start))
select {
case <-s.ctx.Done():
return
case <-ticker.C:
}
}
}
func (s *Store) Filled(slot phase0.Slot) (bool, error) {
var exists bool
err := s.db.View(func(txn *badger.Txn) error {
var slotBytes [8]byte
binary.BigEndian.PutUint64(slotBytes[:], uint64(slot))
_, err := txn.Get(append(keySlot, slotBytes[:]...))
if err == nil {
exists = true
} else if err != badger.ErrKeyNotFound {
return err
}
return nil
})
return exists, err
}
func (s *Store) Count() (slots, blocks int, err error) {
err = s.db.View(func(txn *badger.Txn) error {
it := txn.NewIterator(badger.DefaultIteratorOptions)
defer it.Close()
for it.Seek(keySlot); it.ValidForPrefix(keySlot); it.Next() {
slots++
err := it.Item().Value(func(val []byte) error {
version := spec.DataVersion(binary.BigEndian.Uint64(val[:8]))
if version != spec.DataVersion(math.MaxInt) {
blocks++
}
return nil
})
if err != nil {
return err
}
}
return nil
})
return
}
type BlockWithRoot struct {
BlockRoot phase0.Root
*spec.VersionedSignedBeaconBlock
}
func (s *Store) Block(slot phase0.Slot) (*BlockWithRoot, error) {
block := &BlockWithRoot{VersionedSignedBeaconBlock: &spec.VersionedSignedBeaconBlock{}}
err := s.db.View(func(txn *badger.Txn) error {
// 1) Read slot from key.
var slotBytes [8]byte
binary.BigEndian.PutUint64(slotBytes[:], uint64(slot))
item, err := txn.Get(append(keySlot, slotBytes[:]...))
if err != nil {
return err
}
// 2) Copy the value.
val, err := item.ValueCopy(nil)
if err != nil {
return err
}
// 2.1) Read version.
block.Version = spec.DataVersion(binary.BigEndian.Uint64(val[:8]))
if block.Version == spec.DataVersion(math.MaxInt) {
// No block for this slot.
block = nil
return nil
}
// 2.2) Read root.
copy(block.BlockRoot[:], val[8:40])
// 2.3) Read block.
blockBytes, err := snappy.Decode(nil, val[40:])
if err != nil {
return err
}
switch block.Version {
case spec.DataVersionPhase0:
block.Phase0 = &phase0.SignedBeaconBlock{}
if err := block.Phase0.UnmarshalSSZ(blockBytes); err != nil {
return err
}
case spec.DataVersionAltair:
block.Altair = &altair.SignedBeaconBlock{}
if err := block.Altair.UnmarshalSSZ(blockBytes); err != nil {
return err
}
case spec.DataVersionBellatrix:
block.Bellatrix = &bellatrix.SignedBeaconBlock{}
if err := block.Bellatrix.UnmarshalSSZ(blockBytes); err != nil {
return err
}
}
return nil
})
return block, err
}
func (s *Store) SetBlock(slot phase0.Slot, block *BlockWithRoot) error {
return s.db.Update(func(txn *badger.Txn) error {
var slotBytes [8]byte
binary.BigEndian.PutUint64(slotBytes[:], uint64(slot))
var versionBytes [8]byte
if block == nil {
binary.BigEndian.PutUint64(versionBytes[:], math.MaxInt)
} else {
binary.BigEndian.PutUint64(versionBytes[:], uint64(block.Version))
}
var root phase0.Root
if block != nil {
root = block.BlockRoot
}
var blockBytes []byte
if block != nil {
var (
b []byte
err error
)
switch block.Version {
case spec.DataVersionPhase0:
b, err = block.Phase0.MarshalSSZ()
case spec.DataVersionAltair:
b, err = block.Altair.MarshalSSZ()
case spec.DataVersionBellatrix:
b, err = block.Bellatrix.MarshalSSZ()
}
if err != nil {
return err
}
blockBytes = snappy.Encode(nil, b)
}
value := make([]byte, 0, len(versionBytes)+len(root)+len(blockBytes))
value = append(value, versionBytes[:]...)
value = append(value, root[:]...)
value = append(value, blockBytes[:]...)
return txn.Set(
append(keySlot, slotBytes[:]...),
value,
)
})
}
// Purge removes all slots within the given range (inclusive).
func (s *Store) Purge(from, to phase0.Slot) (deleted int, err error) {
err = s.db.Update(func(txn *badger.Txn) error {
var fromBytes [8]byte
binary.BigEndian.PutUint64(fromBytes[:], uint64(from))
it := txn.NewIterator(badger.DefaultIteratorOptions)
defer it.Close()
fromKey := append(keySlot, fromBytes[:]...)
for it.Seek(fromKey); it.ValidForPrefix(keySlot); it.Next() {
key := it.Item().KeyCopy(nil)
slot := phase0.Slot(binary.BigEndian.Uint64(key[len(keySlot):]))
if slot > to {
break
}
if err := txn.Delete(key); err != nil {
return err
}
deleted++
}
return nil
})
return
}
func (s *Store) Close() error {
s.cancel()
return s.db.Close()
}