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badger_custodian.go
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badger_custodian.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/v4"
)
func (s *BadgerStore) ListCustodianUpdates() ([]*common.CustodianUpdateRequest, error) {
txn := s.snapshotsDB.NewTransaction(false)
defer txn.Discard()
opts := badger.DefaultIteratorOptions
opts.PrefetchValues = true
opts.Prefix = []byte(graphPrefixCustodianUpdate)
opts.Reverse = false
it := txn.NewIterator(opts)
defer it.Close()
genesis := true
var curs []*common.CustodianUpdateRequest
it.Seek(graphCustodianUpdateKey(0))
for ; it.ValidForPrefix([]byte(graphPrefixCustodianUpdate)); it.Next() {
cur, err := parseCustodianUpdateItem(txn, it, genesis)
if err != nil {
return nil, err
}
curs = append(curs, cur)
genesis = false
}
return curs, nil
}
func (s *BadgerStore) ReadCustodian(ts uint64) (*common.CustodianUpdateRequest, error) {
txn := s.snapshotsDB.NewTransaction(false)
defer txn.Discard()
return readCustodianAccount(txn, ts)
}
func readCustodianAccount(txn *badger.Txn, ts uint64) (*common.CustodianUpdateRequest, error) {
opts := badger.DefaultIteratorOptions
opts.PrefetchValues = true
opts.Prefix = []byte(graphPrefixCustodianUpdate)
opts.Reverse = false
it := txn.NewIterator(opts)
defer it.Close()
genesis := true
var found *common.CustodianUpdateRequest
it.Seek(graphCustodianUpdateKey(0))
for ; it.ValidForPrefix([]byte(graphPrefixCustodianUpdate)); it.Next() {
cur, err := parseCustodianUpdateItem(txn, it, genesis)
if err != nil {
return nil, err
}
if cur.Timestamp > ts {
break
}
found = cur
genesis = false
}
return found, nil
}
func parseCustodianUpdateItem(txn *badger.Txn, it *badger.Iterator, genesis bool) (*common.CustodianUpdateRequest, error) {
key := it.Item().KeyCopy(nil)
ts := graphCustodianAccountTimestamp(key)
val, err := it.Item().ValueCopy(nil)
if err != nil {
return nil, err
}
if len(val) != 32 {
panic(len(val))
}
var hash crypto.Hash
copy(hash[:], val)
tx, err := readTransaction(txn, hash)
if err != nil {
return nil, err
}
cur, err := common.ParseCustodianUpdateNodesExtra(tx.Extra, genesis)
if err != nil {
return nil, err
}
cur.Transaction = hash
cur.Timestamp = ts
return cur, nil
}
func writeCustodianNodes(txn *badger.Txn, snapTime uint64, utxo *common.UTXOWithLock, extra []byte, genesis bool) error {
now, err := common.ParseCustodianUpdateNodesExtra(extra, genesis)
if err != nil {
panic(fmt.Errorf("common.ParseCustodianUpdateNodesExtra(%x, %t) => %v", extra, genesis, err))
}
if len(now.Nodes) > 50 {
panic(len(now.Nodes))
}
prev, err := readCustodianAccount(txn, snapTime)
if err != nil {
return err
}
switch {
case prev == nil:
case prev.Timestamp > snapTime:
panic(utxo.Hash.String())
case prev.Timestamp == snapTime && now.Custodian.String() == prev.Custodian.String():
return nil
case prev.Timestamp == snapTime && now.Custodian.String() != prev.Custodian.String():
panic(utxo.Hash.String())
case prev.Timestamp < snapTime:
}
key := graphCustodianUpdateKey(snapTime)
return txn.Set(key, utxo.Hash[:])
}
func graphCustodianUpdateKey(ts uint64) []byte {
key := []byte(graphPrefixCustodianUpdate)
return binary.BigEndian.AppendUint64(key, ts)
}
func graphCustodianAccountTimestamp(key []byte) uint64 {
ts := key[len(graphPrefixCustodianUpdate):]
return binary.BigEndian.Uint64(ts)
}