package core import ( "errors" "time" "github.com/nspcc-dev/neo-go/pkg/config" "github.com/nspcc-dev/neo-go/pkg/config/netmode" "github.com/nspcc-dev/neo-go/pkg/core/block" "github.com/nspcc-dev/neo-go/pkg/core/interop/crypto" "github.com/nspcc-dev/neo-go/pkg/core/transaction" "github.com/nspcc-dev/neo-go/pkg/crypto/hash" "github.com/nspcc-dev/neo-go/pkg/crypto/keys" "github.com/nspcc-dev/neo-go/pkg/io" "github.com/nspcc-dev/neo-go/pkg/smartcontract" "github.com/nspcc-dev/neo-go/pkg/util" "github.com/nspcc-dev/neo-go/pkg/vm" "github.com/nspcc-dev/neo-go/pkg/vm/emit" "github.com/nspcc-dev/neo-go/pkg/vm/opcode" ) var ( // governingTokenTX represents transaction that is used to create // governing (NEO) token. It's a part of the genesis block. governingTokenTX transaction.Transaction // utilityTokenTX represents transaction that is used to create // utility (GAS) token. It's a part of the genesis block. It's mostly // useful for its hash that represents GAS asset ID. utilityTokenTX transaction.Transaction ) // createGenesisBlock creates a genesis block based on the given configuration. func createGenesisBlock(cfg config.ProtocolConfiguration) (*block.Block, error) { validators, err := validatorsFromConfig(cfg) if err != nil { return nil, err } nextConsensus, err := getNextConsensusAddress(validators) if err != nil { return nil, err } base := block.Base{ Version: 0, PrevHash: util.Uint256{}, Timestamp: uint64(time.Date(2016, 7, 15, 15, 8, 21, 0, time.UTC).Unix()) * 1000, // Milliseconds. Index: 0, NextConsensus: nextConsensus, Script: transaction.Witness{ InvocationScript: []byte{}, VerificationScript: []byte{byte(opcode.PUSH1)}, }, Network: cfg.Magic, } b := &block.Block{ Base: base, Transactions: []*transaction.Transaction{ deployNativeContracts(cfg.Magic), }, ConsensusData: block.ConsensusData{ PrimaryIndex: 0, Nonce: 2083236893, }, } if err = b.RebuildMerkleRoot(); err != nil { return nil, err } return b, nil } func deployNativeContracts(magic netmode.Magic) *transaction.Transaction { buf := io.NewBufBinWriter() emit.Syscall(buf.BinWriter, "Neo.Native.Deploy") script := buf.Bytes() tx := transaction.New(magic, script, 0) tx.Nonce = 0 tx.Signers = []transaction.Signer{ { Account: hash.Hash160([]byte{byte(opcode.PUSH1)}), Scopes: transaction.FeeOnly, }, } tx.Scripts = []transaction.Witness{ { InvocationScript: []byte{}, VerificationScript: []byte{byte(opcode.PUSH1)}, }, } return tx } func validatorsFromConfig(cfg config.ProtocolConfiguration) ([]*keys.PublicKey, error) { vs, err := committeeFromConfig(cfg) if err != nil { return nil, err } return vs[:cfg.ValidatorsCount], nil } func committeeFromConfig(cfg config.ProtocolConfiguration) ([]*keys.PublicKey, error) { if len(cfg.StandbyCommittee) < cfg.ValidatorsCount { return nil, errors.New("validators count can be less than the size of StandbyCommittee") } validators := make([]*keys.PublicKey, len(cfg.StandbyCommittee)) for i := range validators { pubKey, err := keys.NewPublicKeyFromString(cfg.StandbyCommittee[i]) if err != nil { return nil, err } validators[i] = pubKey } return validators, nil } func getNextConsensusAddress(validators []*keys.PublicKey) (val util.Uint160, err error) { raw, err := smartcontract.CreateDefaultMultiSigRedeemScript(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 []*block.Header) { for i, j := 0, len(dest)-1; i < j; i, j = i+1, j-1 { dest[i], dest[j] = dest[j], dest[i] } } // CalculateNetworkFee returns network fee for transaction func CalculateNetworkFee(script []byte) (int64, int) { var ( netFee int64 size int ) if vm.IsSignatureContract(script) { size += 67 + io.GetVarSize(script) netFee += opcodePrice(opcode.PUSHDATA1, opcode.PUSHNULL) + crypto.ECDSAVerifyPrice } else if m, pubs, ok := vm.ParseMultiSigContract(script); ok { n := len(pubs) sizeInv := 66 * m size += io.GetVarSize(sizeInv) + sizeInv + io.GetVarSize(script) netFee += calculateMultisigFee(m) + calculateMultisigFee(n) netFee += opcodePrice(opcode.PUSHNULL) + crypto.ECDSAVerifyPrice*int64(n) } else { // We can support more contract types in the future. } return netFee, size } func calculateMultisigFee(n int) int64 { result := opcodePrice(opcode.PUSHDATA1) * int64(n) bw := io.NewBufBinWriter() emit.Int(bw.BinWriter, int64(n)) // it's a hack because prices of small PUSH* opcodes are equal result += opcodePrice(opcode.Opcode(bw.Bytes()[0])) return result }