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badger_mint.go
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badger_mint.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/v2"
)
func (s *BadgerStore) ReadMintDistributions(group string, offset, count uint64) ([]*common.MintDistribution, []*common.VersionedTransaction, error) {
if count > 500 {
return nil, nil, fmt.Errorf("count %d too large, the maximum is 500", count)
}
mints := make([]*common.MintDistribution, 0)
transactions := make([]*common.VersionedTransaction, 0)
txn := s.snapshotsDB.NewTransaction(false)
defer txn.Discard()
it := txn.NewIterator(badger.DefaultIteratorOptions)
defer it.Close()
prefix := []byte(graphPrefixMint + group)
it.Seek(graphMintKey(group, offset))
for ; it.ValidForPrefix(prefix) && uint64(len(mints)) < count; it.Next() {
item := it.Item()
ival, err := item.ValueCopy(nil)
if err != nil {
return nil, nil, err
}
var data common.MintDistribution
err = common.MsgpackUnmarshal(ival, &data)
if err != nil {
return nil, nil, err
}
if data.Batch != graphMintBatch(item.Key(), group) {
panic("malformed mint data")
}
tx, err := readTransaction(txn, data.Transaction)
if err != nil {
return nil, nil, err
}
if tx == nil {
continue
}
_, err = txn.Get(graphFinalizationKey(data.Transaction))
if err == badger.ErrKeyNotFound {
continue
} else if err != nil {
return nil, nil, err
}
transactions = append(transactions, tx)
mints = append(mints, &data)
}
return mints, transactions, nil
}
func (s *BadgerStore) ReadLastMintDistribution(group string) (*common.MintDistribution, error) {
txn := s.snapshotsDB.NewTransaction(false)
defer txn.Discard()
opts := badger.DefaultIteratorOptions
opts.Reverse = true
it := txn.NewIterator(opts)
defer it.Close()
dist := &common.MintDistribution{Group: group}
prefix := []byte(graphPrefixMint + group)
it.Seek(graphMintKey(group, ^uint64(0)))
for ; it.ValidForPrefix(prefix); it.Next() {
item := it.Item()
ival, err := item.ValueCopy(nil)
if err != nil {
return nil, err
}
var data common.MintDistribution
err = common.MsgpackUnmarshal(ival, &data)
if err != nil {
return nil, err
}
if data.Batch != graphMintBatch(item.Key(), group) {
panic("malformed mint data")
}
_, err = txn.Get(graphFinalizationKey(data.Transaction))
if err == badger.ErrKeyNotFound {
continue
} else if err != nil {
return nil, err
}
dist.Batch = graphMintBatch(item.Key(), group)
dist.Transaction = data.Transaction
dist.Amount = data.Amount
break
}
return dist, nil
}
func (s *BadgerStore) LockMintInput(mint *common.MintData, tx crypto.Hash, fork bool) error {
return s.snapshotsDB.Update(func(txn *badger.Txn) error {
dist, err := readMintInput(txn, mint)
if err == badger.ErrKeyNotFound {
return writeMintDistribution(txn, mint, tx)
}
if err != nil {
return err
}
if dist.Transaction == tx && dist.Amount.Cmp(mint.Amount) == 0 {
return nil
}
if !fork {
return fmt.Errorf("mint locked for transaction %s amount %s", dist.Transaction.String(), dist.Amount.String())
}
err = pruneTransaction(txn, dist.Transaction)
if err != nil {
return err
}
return writeMintDistribution(txn, mint, tx)
})
}
func readMintInput(txn *badger.Txn, mint *common.MintData) (*common.MintDistribution, error) {
key := graphMintKey(mint.Group, mint.Batch)
item, err := txn.Get(key)
if err != nil {
return nil, err
}
ival, err := item.ValueCopy(nil)
if err != nil {
return nil, err
}
var dist common.MintDistribution
err = common.MsgpackUnmarshal(ival, &dist)
return &dist, err
}
func writeMintDistribution(txn *badger.Txn, mint *common.MintData, tx crypto.Hash) error {
key := graphMintKey(mint.Group, mint.Batch)
val := common.MsgpackMarshalPanic(mint.Distribute(tx))
return txn.Set(key, val)
}
func graphMintKey(group string, batch uint64) []byte {
buf := make([]byte, 8)
binary.BigEndian.PutUint64(buf, batch)
key := append([]byte(group), buf...)
return append([]byte(graphPrefixMint), key...)
}
func graphMintBatch(key []byte, group string) uint64 {
batch := key[len(graphPrefixMint)+len(group):]
return binary.BigEndian.Uint64(batch)
}