neo-go/pkg/core/util.go

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package core
import (
"time"
"github.com/CityOfZion/neo-go/config"
"github.com/CityOfZion/neo-go/pkg/core/storage"
"github.com/CityOfZion/neo-go/pkg/core/transaction"
"github.com/CityOfZion/neo-go/pkg/crypto/hash"
"github.com/CityOfZion/neo-go/pkg/crypto/keys"
"github.com/CityOfZion/neo-go/pkg/io"
"github.com/CityOfZion/neo-go/pkg/smartcontract"
"github.com/CityOfZion/neo-go/pkg/util"
"github.com/CityOfZion/neo-go/pkg/vm"
)
// Creates a genesis block based on the given configuration.
func createGenesisBlock(cfg config.ProtocolConfiguration) (*Block, error) {
validators, err := getValidators(cfg)
if err != nil {
return nil, err
}
nextConsensus, err := getNextConsensusAddress(validators)
if err != nil {
return nil, err
}
base := BlockBase{
Version: 0,
PrevHash: util.Uint256{},
Timestamp: uint32(time.Date(2016, 7, 15, 15, 8, 21, 0, time.UTC).Unix()),
Index: 0,
ConsensusData: 2083236893,
NextConsensus: nextConsensus,
Script: &transaction.Witness{
InvocationScript: []byte{},
VerificationScript: []byte{byte(vm.PUSHT)},
},
}
governingTX := governingTokenTX()
utilityTX := utilityTokenTX()
rawScript, err := smartcontract.CreateMultiSigRedeemScript(
len(cfg.StandbyValidators)/2+1,
validators,
)
if err != nil {
return nil, err
}
scriptOut := hash.Hash160(rawScript)
block := &Block{
BlockBase: base,
Transactions: []*transaction.Transaction{
{
Type: transaction.MinerType,
Data: &transaction.MinerTX{
Nonce: 2083236893,
},
Attributes: []*transaction.Attribute{},
Inputs: []*transaction.Input{},
Outputs: []*transaction.Output{},
Scripts: []*transaction.Witness{},
},
governingTX,
utilityTX,
{
Type: transaction.IssueType,
Data: &transaction.IssueTX{}, // no fields.
Inputs: []*transaction.Input{},
Outputs: []*transaction.Output{
{
AssetID: governingTX.Hash(),
Amount: governingTX.Data.(*transaction.RegisterTX).Amount,
ScriptHash: scriptOut,
},
},
Scripts: []*transaction.Witness{
{
InvocationScript: []byte{},
VerificationScript: []byte{byte(vm.PUSHT)},
},
},
},
},
}
if err = block.rebuildMerkleRoot(); err != nil {
return nil, err
}
return block, nil
}
func governingTokenTX() *transaction.Transaction {
admin := hash.Hash160([]byte{byte(vm.PUSHT)})
registerTX := &transaction.RegisterTX{
AssetType: transaction.GoverningToken,
Name: "[{\"lang\":\"zh-CN\",\"name\":\"小蚁股\"},{\"lang\":\"en\",\"name\":\"AntShare\"}]",
Amount: util.Fixed8FromInt64(100000000),
Precision: 0,
Owner: &keys.PublicKey{},
Admin: admin,
}
tx := &transaction.Transaction{
Type: transaction.RegisterType,
Data: registerTX,
Attributes: []*transaction.Attribute{},
Inputs: []*transaction.Input{},
Outputs: []*transaction.Output{},
Scripts: []*transaction.Witness{},
}
return tx
}
func utilityTokenTX() *transaction.Transaction {
admin := hash.Hash160([]byte{byte(vm.PUSHF)})
registerTX := &transaction.RegisterTX{
AssetType: transaction.UtilityToken,
Name: "[{\"lang\":\"zh-CN\",\"name\":\"小蚁币\"},{\"lang\":\"en\",\"name\":\"AntCoin\"}]",
Amount: calculateUtilityAmount(),
Precision: 8,
Owner: &keys.PublicKey{},
Admin: admin,
}
tx := &transaction.Transaction{
Type: transaction.RegisterType,
Data: registerTX,
Attributes: []*transaction.Attribute{},
Inputs: []*transaction.Input{},
Outputs: []*transaction.Output{},
Scripts: []*transaction.Witness{},
}
return tx
}
func getValidators(cfg config.ProtocolConfiguration) ([]*keys.PublicKey, error) {
validators := make([]*keys.PublicKey, len(cfg.StandbyValidators))
for i, pubKeyStr := range cfg.StandbyValidators {
pubKey, err := keys.NewPublicKeyFromString(pubKeyStr)
if err != nil {
return nil, err
}
validators[i] = pubKey
}
return validators, nil
}
func getNextConsensusAddress(validators []*keys.PublicKey) (val util.Uint160, err error) {
vlen := len(validators)
raw, err := smartcontract.CreateMultiSigRedeemScript(
vlen-(vlen-1)/3,
validators,
)
if err != nil {
return val, err
}
return hash.Hash160(raw), nil
}
func calculateUtilityAmount() util.Fixed8 {
sum := 0
for i := 0; i < len(genAmount); i++ {
sum += genAmount[i]
}
return util.Fixed8FromInt64(int64(sum * decrementInterval))
}
// headerSliceReverse reverses the given slice of *Header.
func headerSliceReverse(dest []*Header) {
for i, j := 0, len(dest)-1; i < j; i, j = i+1, j-1 {
dest[i], dest[j] = dest[j], dest[i]
}
}
// storeAsCurrentBlock stores the given block witch prefix
// SYSCurrentBlock.
func storeAsCurrentBlock(batch storage.Batch, block *Block) {
buf := io.NewBufBinWriter()
buf.WriteLE(block.Hash().BytesReverse())
buf.WriteLE(block.Index)
batch.Put(storage.SYSCurrentBlock.Bytes(), buf.Bytes())
}
// storeAsBlock stores the given block as DataBlock.
func storeAsBlock(batch storage.Batch, block *Block, sysFee uint32) error {
var (
key = storage.AppendPrefix(storage.DataBlock, block.Hash().BytesReverse())
buf = io.NewBufBinWriter()
)
// sysFee needs to be handled somehow
// buf.WriteLE(sysFee)
b, err := block.Trim()
if err != nil {
return err
}
buf.WriteLE(b)
if buf.Err != nil {
return buf.Err
}
batch.Put(key, buf.Bytes())
return nil
}
// storeAsTransaction stores the given TX as DataTransaction.
func storeAsTransaction(batch storage.Batch, tx *transaction.Transaction, index uint32) error {
key := storage.AppendPrefix(storage.DataTransaction, tx.Hash().BytesReverse())
buf := io.NewBufBinWriter()
buf.WriteLE(index)
tx.EncodeBinary(buf.BinWriter)
if buf.Err != nil {
return buf.Err
}
batch.Put(key, buf.Bytes())
return nil
}