/
indexGenerator.go
184 lines (155 loc) · 6.26 KB
/
indexGenerator.go
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package transaction
import (
"encoding/binary"
"errors"
"math/big"
"github.com/apple/foundationdb/bindings/go/src/fdb"
"github.com/apple/foundationdb/bindings/go/src/fdb/directory"
"github.com/apple/foundationdb/bindings/go/src/fdb/subspace"
"github.com/apple/foundationdb/bindings/go/src/fdb/tuple"
"github.com/bankex/go-plasma/types"
"github.com/ethereum/go-ethereum/common"
)
const (
UTXOIndexLength = AddressLength + BlockNumberLength + TransactionNumberLength +
OutputNumberLength + ValueLength
ShortUTXOIndexLength = BlockNumberLength + TransactionNumberLength +
OutputNumberLength
)
var (
MaxUTXOIndex = big.NewInt(0).Lsh(big.NewInt(1), (BlockNumberLength+TransactionNumberLength+
OutputNumberLength)*8)
)
type HumanReadableUTXOdetails struct {
Owner string
BlockNumber uint32
TransactionNumber uint32
OutputNumber uint8
Value string
}
type ShortUTXOdetails struct {
BlockNumber uint32
TransactionNumber uint32
OutputNumber uint8
}
func CreateCorrespondingUTXOIndexForInput(tx *SignedTransaction, inputNumber int) ([UTXOIndexLength]byte, error) {
if inputNumber > len(tx.UnsignedTransaction.Inputs) {
return [UTXOIndexLength]byte{}, errors.New("Invalid input number")
}
input := tx.UnsignedTransaction.Inputs[inputNumber]
from, err := tx.GetFrom()
if err != nil {
return [UTXOIndexLength]byte{}, err
}
index := []byte{}
index = append(index, from[:]...)
index = append(index, input.BlockNumber[:]...)
index = append(index, input.TransactionNumber[:]...)
index = append(index, input.OutputNumber[:]...)
index = append(index, input.Value[:]...)
if len(index) != UTXOIndexLength {
return [UTXOIndexLength]byte{}, errors.New("Index length mismatch")
}
indexCopy := [UTXOIndexLength]byte{}
copy(indexCopy[:], index)
return indexCopy, nil
}
func CreateFdbUTXOIndexForInput(db fdb.Database, tx *SignedTransaction, inputNumber int) (subspace.Subspace, error) {
if inputNumber > len(tx.UnsignedTransaction.Inputs) {
return nil, errors.New("Invalid input number")
}
input := tx.UnsignedTransaction.Inputs[inputNumber]
from, err := tx.GetFrom()
if err != nil {
return nil, err
}
addressDirectory, err := directory.CreateOrOpen(db, []string{"utxo"}, nil)
// fmt.Println(common.ToHex(addressDirectory.Bytes()))
fullSubspace := addressDirectory.Sub(tuple.Tuple{from[:]})
// fmt.Println(common.ToHex(fullSubspace.Bytes()))
fullSubspace = fullSubspace.Sub(tuple.Tuple{input.BlockNumber[:]})
// fmt.Println(common.ToHex(fullSubspace.Bytes()))
fullSubspace = fullSubspace.Sub(tuple.Tuple{input.TransactionNumber[:]})
// fmt.Println(common.ToHex(fullSubspace.Bytes()))
fullSubspace = fullSubspace.Sub(tuple.Tuple{input.OutputNumber[:]})
// fmt.Println(common.ToHex(fullSubspace.Bytes()))
fullSubspace = fullSubspace.Sub(tuple.Tuple{input.Value[:]})
// fmt.Println(common.ToHex(fullSubspace.Bytes()))
return fullSubspace, nil
}
func CreateUTXOIndexForOutput(tx *SignedTransaction, blockNumber uint32, transactionNumber uint32, outputNumber int) ([UTXOIndexLength]byte, error) {
if outputNumber > len(tx.UnsignedTransaction.Outputs) {
return [UTXOIndexLength]byte{}, errors.New("Invalid output number")
}
output := tx.UnsignedTransaction.Outputs[outputNumber]
index := []byte{}
blockNumberBuffer := make([]byte, BlockNumberLength)
binary.BigEndian.PutUint32(blockNumberBuffer, blockNumber)
transactionNumberBuffer := make([]byte, TransactionNumberLength)
binary.BigEndian.PutUint32(transactionNumberBuffer, transactionNumber)
index = append(index, output.To[:]...)
index = append(index, blockNumberBuffer...)
index = append(index, transactionNumberBuffer[:]...)
index = append(index, output.OutputNumber[:]...)
index = append(index, output.Value[:]...)
if len(index) != UTXOIndexLength {
return [UTXOIndexLength]byte{}, errors.New("Index length mismatch")
}
indexCopy := [UTXOIndexLength]byte{}
copy(indexCopy[:], index)
return indexCopy, nil
}
func CreateShortUTXOIndexForOutput(tx *SignedTransaction, blockNumber uint32, transactionNumber uint32, outputNumber int) ([]byte, error) {
if outputNumber > len(tx.UnsignedTransaction.Outputs) {
return nil, errors.New("Invalid output number")
}
output := tx.UnsignedTransaction.Outputs[outputNumber]
index := []byte{}
blockNumberBuffer := make([]byte, BlockNumberLength)
binary.BigEndian.PutUint32(blockNumberBuffer, blockNumber)
transactionNumberBuffer := make([]byte, TransactionNumberLength)
binary.BigEndian.PutUint32(transactionNumberBuffer, transactionNumber)
index = append(index, blockNumberBuffer...)
index = append(index, transactionNumberBuffer[:]...)
index = append(index, output.OutputNumber[:]...)
return index, nil
}
func ParseIndexIntoUTXOdetails(index [UTXOIndexLength]byte) HumanReadableUTXOdetails {
idx := 0
ownerBytes := index[idx : idx+AddressLength]
idx += AddressLength
blockNumberBytes := index[idx : idx+BlockNumberLength]
idx += BlockNumberLength
transactionNumberBytes := index[idx : idx+TransactionNumberLength]
idx += TransactionNumberLength
outputNumberBytes := index[idx : idx+OutputNumberLength]
idx += OutputNumberLength
valueBytes := index[idx : idx+ValueLength]
blockNumber := binary.BigEndian.Uint32(blockNumberBytes)
transactionNumber := binary.BigEndian.Uint32(transactionNumberBytes)
outputNumber := uint8(outputNumberBytes[0])
value := types.NewBigInt(0)
value.SetBytes(valueBytes)
owner := common.ToHex(ownerBytes)
return HumanReadableUTXOdetails{owner, blockNumber, transactionNumber, outputNumber, value.GetString(10)}
}
func ParseUTXOindexNumberIntoDetails(indexBN *types.BigInt) (*ShortUTXOdetails, error) {
if indexBN.Bigint.Cmp(MaxUTXOIndex) != -1 {
return nil, errors.New("Index is too large")
}
index, err := indexBN.GetLeftPaddedBytes(ShortUTXOIndexLength)
if err != nil {
return nil, err
}
idx := 0
blockNumberBytes := index[idx : idx+BlockNumberLength]
idx += BlockNumberLength
transactionNumberBytes := index[idx : idx+TransactionNumberLength]
idx += TransactionNumberLength
outputNumberBytes := index[idx : idx+OutputNumberLength]
idx += OutputNumberLength
blockNumber := binary.BigEndian.Uint32(blockNumberBytes)
transactionNumber := binary.BigEndian.Uint32(transactionNumberBytes)
outputNumber := uint8(outputNumberBytes[0])
return &ShortUTXOdetails{blockNumber, transactionNumber, outputNumber}, nil
}