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txbuilder.go
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txbuilder.go
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package abchainTx
import (
"crypto/rand"
"errors"
"time"
"github.com/golang/protobuf/proto"
"github.com/golang/protobuf/ptypes/timestamp"
pb "hyperledger.abchain.org/protos"
)
type TxMaker interface {
GetCredBuilder() AddrCredentialBuilder
GetDataCredBuilder() DataCredentialsBuilder
GenArguments() ([][]byte, error)
GenArgumentsWithoutCred() ([][]byte, error)
GenHash(string) []byte
}
type baseMaker struct {
txArgs [][]byte
credBuilder *builder
}
func NewTxMaker(args [][]byte) *baseMaker {
return &baseMaker{args, newTxCredentialBuilder()}
}
func (b *baseMaker) GenHash(method string) []byte {
return genHash(b.txArgs[0], b.txArgs[1], method)
}
func (b *baseMaker) GetCredBuilder() AddrCredentialBuilder {
return b.credBuilder
}
func (b *baseMaker) GetDataCredBuilder() DataCredentialsBuilder {
return b.credBuilder
}
func (b *baseMaker) GenArguments() ([][]byte, error) {
if b.credBuilder == nil {
return nil, errors.New("No cred yet")
}
cred := &pb.TxCredential{}
err := b.credBuilder.update(cred)
if err != nil {
return nil, err
}
cr := msgToByte(cred)
if cr == nil {
return nil, errors.New("Invalid cred data")
}
arg, err := b.GenArgumentsWithoutCred()
if err != nil {
return nil, err
}
return append(arg, cr), nil
}
func (b *baseMaker) GenArgumentsWithoutCred() ([][]byte, error) {
return b.txArgs, nil
}
type Builder interface {
TxMaker
GetNonce() []byte
GetHash() []byte
}
type baseBuilder struct {
baseMaker
method string
nonce []byte
txHash []byte
}
func (b *baseBuilder) GetHash() []byte {
if b.txHash == nil {
b.txHash = b.GenHash(b.method)
}
return b.txHash
}
func (b *baseBuilder) GetNonce() []byte {
return b.nonce
}
func (b *baseBuilder) SetHeader(h *pb.TxHeader) error {
hh := msgToByte(h)
if hh == nil {
return errors.New("Encode header fail")
}
b.nonce = h.GetNonce()
b.txHash = nil
b.txArgs[0] = hh
return nil
}
func (b *baseBuilder) SetMethod(m string) {
b.txHash = nil
b.method = m
}
func (b *baseBuilder) SetMessage(msg proto.Message) error {
hm := msgToByte(msg)
if hm == nil {
return errors.New("No message binded")
}
b.txArgs[1] = hm
b.txHash = nil
return nil
}
const (
queryEffectInHour int = 1
)
func GenerateNonce() []byte {
nonce := make([]byte, 20)
_, err := rand.Read(nonce)
if err != nil {
//try different way to generate a nonce
return []byte(time.Now().String())
}
return nonce
}
func newTxBuilder() *baseBuilder {
return &baseBuilder{baseMaker: baseMaker{make([][]byte, 2), newTxCredentialBuilder()}}
}
func NewTxBuilderWithTimeLock(ccname string, nonce []byte, t time.Time) (b *baseBuilder, err error) {
if nonce == nil {
nonce = GenerateNonce()
}
header := &pb.TxHeader{
Base: &pb.TxBase{
Network: DefaultNetworkName(),
Ccname: ccname,
},
ExpiredTs: ×tamp.Timestamp{
Seconds: t.Unix(),
Nanos: 0},
Nonce: nonce,
Flags: TxFlag_Timelock().U(),
}
b = newTxBuilder()
err = b.SetHeader(header)
return
}
func NewTxBuilder2(ccname string, nonce []byte) (b *baseBuilder, err error) {
if nonce == nil {
nonce = GenerateNonce()
}
header := &pb.TxHeader{
Base: &pb.TxBase{
Network: DefaultNetworkName(),
Ccname: ccname,
},
ExpiredTs: ×tamp.Timestamp{
Seconds: time.Now().Unix() + int64(queryEffectInHour*3600),
Nanos: 0},
Nonce: nonce,
}
b = newTxBuilder()
err = b.SetHeader(header)
return
}
func NewTxBuilder(ccname string, nonce []byte, method string, msg proto.Message) (*baseBuilder, error) {
b, err := NewTxBuilder2(ccname, nonce)
if err != nil {
return nil, err
}
err = b.SetMessage(msg)
if err != nil {
return nil, err
}
b.SetMethod(method)
return b, nil
}