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badger_round.go
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badger_round.go
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package storage
import (
"encoding/binary"
"fmt"
"github.com/MixinNetwork/mixin/common"
"github.com/MixinNetwork/mixin/config"
"github.com/MixinNetwork/mixin/crypto"
"github.com/dgraph-io/badger"
)
func (s *BadgerStore) ReadLink(from, to crypto.Hash) (uint64, error) {
txn := s.snapshotsDB.NewTransaction(false)
defer txn.Discard()
return readLink(txn, from, to)
}
func (s *BadgerStore) ReadRound(hash crypto.Hash) (*common.Round, error) {
txn := s.snapshotsDB.NewTransaction(false)
defer txn.Discard()
return readRound(txn, hash)
}
func (s *BadgerStore) UpdateEmptyHeadRound(node crypto.Hash, number uint64, references *common.RoundLink) error {
txn := s.snapshotsDB.NewTransaction(true)
defer txn.Discard()
self, err := readRound(txn, node)
if err != nil {
return err
}
if self.Number != number {
panic("round number assert error")
}
if self.References.Self != references.Self {
panic("self reference assert error")
}
external, err := readRound(txn, references.External)
if err != nil {
return err
}
if external == nil {
panic("external final not exist")
}
if external.NodeId == self.NodeId {
panic("self references loop")
}
snapshots, err := readSnapshotsForNodeRound(txn, node, number)
if err != nil {
return err
}
if len(snapshots) != 0 {
panic("round not empty")
}
err = writeLink(txn, node, external.NodeId, external.Number)
if err != nil {
return err
}
err = writeRound(txn, node, &common.Round{
NodeId: node,
Number: number,
References: references,
})
if err != nil {
return err
}
return txn.Commit()
}
func (s *BadgerStore) StartNewRound(node crypto.Hash, number uint64, references *common.RoundLink, finalStart uint64) error {
txn := s.snapshotsDB.NewTransaction(true)
defer txn.Discard()
// FIXME assert only, remove in future
if config.Debug {
self, err := readRound(txn, node)
if err != nil {
return err
}
external, err := readRound(txn, references.External)
if err != nil {
return err
}
if self == nil || self.Number != number-1 {
panic("self final assert error")
}
if external == nil {
panic("external final not exist")
}
if external.NodeId == self.NodeId {
panic("self references loop")
}
old, err := readRound(txn, references.Self)
if err != nil {
return err
}
if old != nil {
panic("self final already exist")
}
link, err := readLink(txn, node, external.NodeId)
if err != nil {
return err
}
if link > external.Number {
panic(fmt.Sprintf("external link backward %s=>%s %d=>%d", self.NodeId, external.NodeId, link, external.Number))
}
}
// assert end
err := startNewRound(txn, node, number, references, finalStart)
if err != nil {
return err
}
return txn.Commit()
}
func startNewRound(txn *badger.Txn, node crypto.Hash, number uint64, references *common.RoundLink, finalStart uint64) error {
if references != nil {
self, err := readRound(txn, node)
if err != nil {
return err
}
external, err := readRound(txn, references.External)
if err != nil {
return err
}
err = writeLink(txn, node, external.NodeId, external.Number)
if err != nil {
return err
}
self.Timestamp = finalStart
err = writeRound(txn, references.Self, self)
if err != nil {
return err
}
}
return writeRound(txn, node, &common.Round{
NodeId: node,
Number: number,
References: references,
})
}
func readLink(txn *badger.Txn, from, to crypto.Hash) (uint64, error) {
key := graphLinkKey(from, to)
item, err := txn.Get(key)
if err == badger.ErrKeyNotFound {
return 0, nil
}
if err != nil {
return 0, err
}
ival, err := item.ValueCopy(nil)
if err != nil {
return 0, err
}
return binary.BigEndian.Uint64(ival), nil
}
func writeLink(txn *badger.Txn, from, to crypto.Hash, link uint64) error {
buf := make([]byte, 8)
binary.BigEndian.PutUint64(buf, link)
key := graphLinkKey(from, to)
return txn.Set(key, buf)
}
func readRound(txn *badger.Txn, hash crypto.Hash) (*common.Round, error) {
var out common.Round
key := graphRoundKey(hash)
err := graphReadValue(txn, key, &out)
if err == badger.ErrKeyNotFound {
return nil, nil
}
return &out, err
}
func writeRound(txn *badger.Txn, hash crypto.Hash, round *common.Round) error {
key := graphRoundKey(hash)
val := common.MsgpackMarshalPanic(round)
return txn.Set(key, val)
}
func graphRoundKey(hash crypto.Hash) []byte {
return append([]byte(graphPrefixRound), hash[:]...)
}
func graphLinkKey(from, to crypto.Hash) []byte {
link := crypto.NewHash(append(from[:], to[:]...))
return append([]byte(graphPrefixLink), link[:]...)
}