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badger_topology.go
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badger_topology.go
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package storage
import (
"encoding/binary"
"fmt"
"github.com/MixinNetwork/mixin/common"
"github.com/MixinNetwork/mixin/crypto"
"github.com/dgraph-io/badger/v3"
)
func (s *BadgerStore) ReadSnapshot(hash crypto.Hash) (*common.SnapshotWithTopologicalOrder, error) {
txn := s.snapshotsDB.NewTransaction(false)
defer txn.Discard()
return readSnapshotWithTopo(txn, hash)
}
func readSnapshotWithTopo(txn *badger.Txn, hash crypto.Hash) (*common.SnapshotWithTopologicalOrder, error) {
item, err := txn.Get(graphSnapTopologyKey(hash))
if err == badger.ErrKeyNotFound {
return nil, nil
}
if err != nil {
return nil, err
}
topo, err := item.ValueCopy(nil)
if err != nil {
return nil, err
}
item, err = txn.Get(topo)
if err != nil {
return nil, err
}
key, err := item.ValueCopy(nil)
if err != nil {
return nil, err
}
item, err = txn.Get(key)
if err != nil {
return nil, err
}
v, err := item.ValueCopy(nil)
if err != nil {
return nil, err
}
var snap common.SnapshotWithTopologicalOrder
err = common.DecompressMsgpackUnmarshal(v, &snap)
if err != nil {
return nil, err
}
snap.Hash = hash
snap.TopologicalOrder = graphTopologyOrder(topo)
return &snap, nil
}
func (s *BadgerStore) ReadSnapshotWithTransactionsSinceTopology(topologyOffset, count uint64) ([]*common.SnapshotWithTopologicalOrder, []*common.VersionedTransaction, error) {
if count > 500 {
return nil, nil, fmt.Errorf("count %d too large, the maximum is 500", count)
}
snapshots, err := s.ReadSnapshotsSinceTopology(topologyOffset, count)
if err != nil {
return nil, nil, err
}
transactions := make([]*common.VersionedTransaction, len(snapshots))
txn := s.snapshotsDB.NewTransaction(false)
defer txn.Discard()
for i, s := range snapshots {
tx, err := readTransaction(txn, s.Transaction)
if err != nil {
return nil, nil, err
}
transactions[i] = tx
}
return snapshots, transactions, nil
}
func (s *BadgerStore) ReadSnapshotsSinceTopology(topologyOffset, count uint64) ([]*common.SnapshotWithTopologicalOrder, error) {
snapshots := make([]*common.SnapshotWithTopologicalOrder, 0)
txn := s.snapshotsDB.NewTransaction(false)
defer txn.Discard()
opts := badger.DefaultIteratorOptions
opts.Prefix = []byte(graphPrefixTopology)
it := txn.NewIterator(opts)
defer it.Close()
it.Seek(graphTopologyKey(topologyOffset))
for ; it.Valid() && uint64(len(snapshots)) < count; it.Next() {
item := it.Item()
v, err := item.ValueCopy(nil)
if err != nil {
return snapshots, err
}
topology := graphTopologyOrder(item.KeyCopy(nil))
item, err = txn.Get(v)
if err != nil {
return snapshots, err
}
v, err = item.ValueCopy(nil)
if err != nil {
return snapshots, err
}
var snap common.SnapshotWithTopologicalOrder
err = common.DecompressMsgpackUnmarshal(v, &snap)
if err != nil {
return snapshots, err
}
snap.Hash = snap.PayloadHash()
snap.TopologicalOrder = topology
snapshots = append(snapshots, &snap)
}
return snapshots, nil
}
func (s *BadgerStore) TopologySequence() uint64 {
var sequence uint64
txn := s.snapshotsDB.NewTransaction(false)
defer txn.Discard()
opts := badger.DefaultIteratorOptions
opts.PrefetchValues = false
opts.Reverse = true
it := txn.NewIterator(opts)
defer it.Close()
it.Seek(graphTopologyKey(^uint64(0)))
if it.ValidForPrefix([]byte(graphPrefixTopology)) {
key := it.Item().KeyCopy(nil)
sequence = graphTopologyOrder(key)
}
return sequence
}
func writeTopology(txn *badger.Txn, snap *common.SnapshotWithTopologicalOrder) error {
key := graphTopologyKey(snap.TopologicalOrder)
val := graphSnapshotKey(snap.NodeId, snap.RoundNumber, snap.Transaction)
_, err := txn.Get(key)
if err != badger.ErrKeyNotFound {
panic(err)
}
err = txn.Set(key, val[:])
if err != nil {
return err
}
return txn.Set(graphSnapTopologyKey(snap.PayloadHash()), key)
}
func graphSnapTopologyKey(hash crypto.Hash) []byte {
return append([]byte(graphPrefixSnapTopology), hash[:]...)
}
func graphTopologyKey(order uint64) []byte {
buf := make([]byte, 8)
binary.BigEndian.PutUint64(buf, order)
return append([]byte(graphPrefixTopology), buf...)
}
func graphTopologyOrder(key []byte) uint64 {
order := key[len(graphPrefixTopology):]
return binary.BigEndian.Uint64(order)
}