lnd.xprv/mock.go

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package main
import (
"crypto/sha256"
"fmt"
"sync"
"sync/atomic"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcd/txscript"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil"
"github.com/lightningnetwork/lnd/chainntnfs"
"github.com/lightningnetwork/lnd/keychain"
"github.com/lightningnetwork/lnd/lnwallet"
)
// The block height returned by the mock BlockChainIO's GetBestBlock.
const fundingBroadcastHeight = 123
type mockSigner struct {
key *btcec.PrivateKey
}
func (m *mockSigner) SignOutputRaw(tx *wire.MsgTx,
signDesc *lnwallet.SignDescriptor) ([]byte, error) {
amt := signDesc.Output.Value
witnessScript := signDesc.WitnessScript
privKey := m.key
if !privKey.PubKey().IsEqual(signDesc.KeyDesc.PubKey) {
return nil, fmt.Errorf("incorrect key passed")
}
switch {
case signDesc.SingleTweak != nil:
privKey = lnwallet.TweakPrivKey(privKey,
signDesc.SingleTweak)
case signDesc.DoubleTweak != nil:
privKey = lnwallet.DeriveRevocationPrivKey(privKey,
signDesc.DoubleTweak)
}
sig, err := txscript.RawTxInWitnessSignature(tx, signDesc.SigHashes,
signDesc.InputIndex, amt, witnessScript, signDesc.HashType,
privKey)
if err != nil {
return nil, err
}
return sig[:len(sig)-1], nil
}
func (m *mockSigner) ComputeInputScript(tx *wire.MsgTx,
signDesc *lnwallet.SignDescriptor) (*lnwallet.InputScript, error) {
// TODO(roasbeef): expose tweaked signer from lnwallet so don't need to
// duplicate this code?
privKey := m.key
switch {
case signDesc.SingleTweak != nil:
privKey = lnwallet.TweakPrivKey(privKey,
signDesc.SingleTweak)
case signDesc.DoubleTweak != nil:
privKey = lnwallet.DeriveRevocationPrivKey(privKey,
signDesc.DoubleTweak)
}
witnessScript, err := txscript.WitnessSignature(tx, signDesc.SigHashes,
signDesc.InputIndex, signDesc.Output.Value, signDesc.Output.PkScript,
signDesc.HashType, privKey, true)
if err != nil {
return nil, err
}
return &lnwallet.InputScript{
Witness: witnessScript,
}, nil
}
type mockNotfier struct {
confChannel chan *chainntnfs.TxConfirmation
}
func (m *mockNotfier) RegisterConfirmationsNtfn(txid *chainhash.Hash,
_ []byte, numConfs, heightHint uint32) (*chainntnfs.ConfirmationEvent, error) {
return &chainntnfs.ConfirmationEvent{
Confirmed: m.confChannel,
}, nil
}
func (m *mockNotfier) RegisterBlockEpochNtfn() (*chainntnfs.BlockEpochEvent, error) {
return &chainntnfs.BlockEpochEvent{
Epochs: make(chan *chainntnfs.BlockEpoch),
Cancel: func() {},
}, nil
}
func (m *mockNotfier) Start() error {
return nil
}
func (m *mockNotfier) Stop() error {
return nil
}
func (m *mockNotfier) RegisterSpendNtfn(outpoint *wire.OutPoint, _ []byte,
heightHint uint32) (*chainntnfs.SpendEvent, error) {
return &chainntnfs.SpendEvent{
Spend: make(chan *chainntnfs.SpendDetail),
Cancel: func() {},
}, nil
}
// mockSpendNotifier extends the mockNotifier so that spend notifications can be
// triggered and delivered to subscribers.
type mockSpendNotifier struct {
*mockNotfier
spendMap map[wire.OutPoint][]chan *chainntnfs.SpendDetail
mtx sync.Mutex
}
func makeMockSpendNotifier() *mockSpendNotifier {
return &mockSpendNotifier{
mockNotfier: &mockNotfier{
confChannel: make(chan *chainntnfs.TxConfirmation),
},
spendMap: make(map[wire.OutPoint][]chan *chainntnfs.SpendDetail),
}
}
func (m *mockSpendNotifier) RegisterSpendNtfn(outpoint *wire.OutPoint,
_ []byte, heightHint uint32) (*chainntnfs.SpendEvent, error) {
m.mtx.Lock()
defer m.mtx.Unlock()
spendChan := make(chan *chainntnfs.SpendDetail)
m.spendMap[*outpoint] = append(m.spendMap[*outpoint], spendChan)
return &chainntnfs.SpendEvent{
Spend: spendChan,
Cancel: func() {
},
}, nil
}
// Spend dispatches SpendDetails to all subscribers of the outpoint. The details
// will include the transaction and height provided by the caller.
func (m *mockSpendNotifier) Spend(outpoint *wire.OutPoint, height int32,
txn *wire.MsgTx) {
m.mtx.Lock()
defer m.mtx.Unlock()
if spendChans, ok := m.spendMap[*outpoint]; ok {
delete(m.spendMap, *outpoint)
for _, spendChan := range spendChans {
txnHash := txn.TxHash()
spendChan <- &chainntnfs.SpendDetail{
SpentOutPoint: outpoint,
SpendingHeight: height,
SpendingTx: txn,
SpenderTxHash: &txnHash,
SpenderInputIndex: outpoint.Index,
}
}
}
}
type mockChainIO struct{}
func (*mockChainIO) GetBestBlock() (*chainhash.Hash, int32, error) {
return activeNetParams.GenesisHash, fundingBroadcastHeight, nil
}
func (*mockChainIO) GetUtxo(op *wire.OutPoint, _ []byte,
heightHint uint32) (*wire.TxOut, error) {
return nil, nil
}
func (*mockChainIO) GetBlockHash(blockHeight int64) (*chainhash.Hash, error) {
return nil, nil
}
func (*mockChainIO) GetBlock(blockHash *chainhash.Hash) (*wire.MsgBlock, error) {
return nil, nil
}
// mockWalletController is used by the LightningWallet, and let us mock the
// interaction with the bitcoin network.
type mockWalletController struct {
rootKey *btcec.PrivateKey
prevAddres btcutil.Address
publishedTransactions chan *wire.MsgTx
index uint32
}
// BackEnd returns "mock" to signify a mock wallet controller.
func (*mockWalletController) BackEnd() string {
return "mock"
}
// FetchInputInfo will be called to get info about the inputs to the funding
// transaction.
func (*mockWalletController) FetchInputInfo(
prevOut *wire.OutPoint) (*wire.TxOut, error) {
txOut := &wire.TxOut{
Value: int64(10 * btcutil.SatoshiPerBitcoin),
PkScript: []byte("dummy"),
}
return txOut, nil
}
func (*mockWalletController) ConfirmedBalance(confs int32) (btcutil.Amount, error) {
return 0, nil
}
// NewAddress is called to get new addresses for delivery, change etc.
func (m *mockWalletController) NewAddress(addrType lnwallet.AddressType,
change bool) (btcutil.Address, error) {
addr, _ := btcutil.NewAddressPubKey(
m.rootKey.PubKey().SerializeCompressed(), &chaincfg.MainNetParams)
return addr, nil
}
func (*mockWalletController) GetPrivKey(a btcutil.Address) (*btcec.PrivateKey, error) {
return nil, nil
}
func (*mockWalletController) SendOutputs(outputs []*wire.TxOut,
_ lnwallet.SatPerKWeight) (*chainhash.Hash, error) {
return nil, nil
}
// ListUnspentWitness is called by the wallet when doing coin selection. We just
// need one unspent for the funding transaction.
func (m *mockWalletController) ListUnspentWitness(confirms int32) ([]*lnwallet.Utxo, error) {
utxo := &lnwallet.Utxo{
AddressType: lnwallet.WitnessPubKey,
Value: btcutil.Amount(10 * btcutil.SatoshiPerBitcoin),
PkScript: make([]byte, 22),
OutPoint: wire.OutPoint{
Hash: chainhash.Hash{},
Index: m.index,
},
}
atomic.AddUint32(&m.index, 1)
var ret []*lnwallet.Utxo
ret = append(ret, utxo)
return ret, nil
}
func (*mockWalletController) ListTransactionDetails() ([]*lnwallet.TransactionDetail, error) {
return nil, nil
}
func (*mockWalletController) LockOutpoint(o wire.OutPoint) {}
func (*mockWalletController) UnlockOutpoint(o wire.OutPoint) {}
func (m *mockWalletController) PublishTransaction(tx *wire.MsgTx) error {
m.publishedTransactions <- tx
return nil
}
func (*mockWalletController) SubscribeTransactions() (lnwallet.TransactionSubscription, error) {
return nil, nil
}
func (*mockWalletController) IsSynced() (bool, int64, error) {
return true, int64(0), nil
}
func (*mockWalletController) Start() error {
return nil
}
func (*mockWalletController) Stop() error {
return nil
}
type mockSecretKeyRing struct {
rootKey *btcec.PrivateKey
}
func (m *mockSecretKeyRing) DeriveNextKey(keyFam keychain.KeyFamily) (keychain.KeyDescriptor, error) {
return keychain.KeyDescriptor{
PubKey: m.rootKey.PubKey(),
}, nil
}
func (m *mockSecretKeyRing) DeriveKey(keyLoc keychain.KeyLocator) (keychain.KeyDescriptor, error) {
return keychain.KeyDescriptor{
PubKey: m.rootKey.PubKey(),
}, nil
}
func (m *mockSecretKeyRing) DerivePrivKey(keyDesc keychain.KeyDescriptor) (*btcec.PrivateKey, error) {
return m.rootKey, nil
}
func (m *mockSecretKeyRing) ScalarMult(keyDesc keychain.KeyDescriptor,
pubKey *btcec.PublicKey) ([]byte, error) {
return nil, nil
}
type mockPreimageCache struct {
sync.Mutex
preimageMap map[[32]byte][]byte
}
func (m *mockPreimageCache) LookupPreimage(hash []byte) ([]byte, bool) {
m.Lock()
defer m.Unlock()
var h [32]byte
copy(h[:], hash)
p, ok := m.preimageMap[h]
return p, ok
}
func (m *mockPreimageCache) AddPreimage(preimage []byte) error {
m.Lock()
defer m.Unlock()
m.preimageMap[sha256.Sum256(preimage[:])] = preimage
return nil
}