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signer.go
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signer.go
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package alliance
import (
"fmt"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcd/txscript"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil"
"github.com/btcsuite/btcutil/base58"
sdk "github.com/ontio/multi-chain-go-sdk"
"github.com/ontio/multi-chain-go-sdk/client"
"github.com/ontio/spvclient/config"
"github.com/ontio/spvclient/log"
"io/ioutil"
"strings"
"time"
)
type Signer struct {
txchan chan *ToSignItem
privk *btcec.PrivateKey
addr *btcutil.AddressPubKey
allia *sdk.MultiChainSdk
acct *sdk.Account
}
func NewSigner(privkFile string, txchan chan *ToSignItem, acct *sdk.Account, allia *sdk.MultiChainSdk,
params *chaincfg.Params) (*Signer, error) {
data, err := ioutil.ReadFile(privkFile)
if err != nil {
return nil, fmt.Errorf("failed to read btc privk: %v", err)
}
privk := string(data)
privk = strings.TrimFunc(privk, func(r rune) bool {
if r == ' ' || r == '\n' {
return true
}
return false
})
privKey, pubk := btcec.PrivKeyFromBytes(btcec.S256(), base58.Decode(privk))
addrPubK, err := btcutil.NewAddressPubKey(pubk.SerializeCompressed(), params)
if err != nil {
return nil, err
}
return &Signer{
txchan: txchan,
privk: privKey,
addr: addrPubK,
acct: acct,
allia: allia,
}, nil
}
func (signer *Signer) Signing() {
log.Infof("[Signer] start signing")
for {
select {
case item := <-signer.txchan:
txHash := item.Mtx.TxHash()
sigs, err := signer.getSigs(item.Mtx, item.Redeem)
if err != nil {
log.Errorf("[Signer] failed to sign (unsigned tx hash %s), not supposed to happen: "+
"%v", txHash.String(), err)
continue
}
txid, err := signer.allia.Native.Ccm.BtcMultiSign(txHash[:], signer.addr.EncodeAddress(), sigs, signer.acct)
if err != nil {
switch err.(type) {
case client.PostErr:
go func() {
signer.txchan <- item
}()
log.Errorf("[Signer] post err and would retry after %d sec: %v", config.SleepTime, err)
wait(time.Second * config.SleepTime)
default:
log.Errorf("[Signer] failed to invoke alliance: %v", err)
}
continue
}
log.Infof("[Signer] signed for btc tx %s and send tx %s to alliance", txHash.String(), txid.ToHexString())
}
}
}
func (signer *Signer) getSigs(tx *wire.MsgTx, redeem []byte) ([][]byte, error) {
sigs := make([][]byte, 0)
for i, _ := range tx.TxIn {
sig, err := txscript.RawTxInSignature(tx, i, redeem, txscript.SigHashAll, signer.privk)
if err != nil {
return nil, fmt.Errorf("Failed to sign tx's No.%d input: %v", i, err)
}
sigs = append(sigs, sig)
}
return sigs, nil
}