package lnd import ( "encoding/hex" "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/btcsuite/btcwallet/wallet/txauthor" "github.com/lightningnetwork/lnd/chainntnfs" "github.com/lightningnetwork/lnd/input" "github.com/lightningnetwork/lnd/keychain" "github.com/lightningnetwork/lnd/lnwallet" "github.com/lightningnetwork/lnd/lnwallet/chainfee" ) var ( coinPkScript, _ = hex.DecodeString("001431df1bde03c074d0cf21ea2529427e1499b8f1de") ) // 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 *input.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 = input.TweakPrivKey(privKey, signDesc.SingleTweak) case signDesc.DoubleTweak != nil: privKey = input.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 *input.SignDescriptor) (*input.Script, 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 = input.TweakPrivKey(privKey, signDesc.SingleTweak) case signDesc.DoubleTweak != nil: privKey = input.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 &input.Script{ 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( bestBlock *chainntnfs.BlockEpoch) (*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 spends map[wire.OutPoint]*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), spends: make(map[wire.OutPoint]*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, 1) if detail, ok := m.spends[*outpoint]; ok { // Deliver spend immediately if details are already known. spendChan <- &chainntnfs.SpendDetail{ SpentOutPoint: detail.SpentOutPoint, SpendingHeight: detail.SpendingHeight, SpendingTx: detail.SpendingTx, SpenderTxHash: detail.SpenderTxHash, SpenderInputIndex: detail.SpenderInputIndex, } } else { // Otherwise, queue the notification for delivery if the spend // is ever received. 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() txnHash := txn.TxHash() details := &chainntnfs.SpendDetail{ SpentOutPoint: outpoint, SpendingHeight: height, SpendingTx: txn, SpenderTxHash: &txnHash, SpenderInputIndex: outpoint.Index, } // Cache details in case of late registration. if _, ok := m.spends[*outpoint]; !ok { m.spends[*outpoint] = details } // Deliver any backlogged spend notifications. if spendChans, ok := m.spendMap[*outpoint]; ok { delete(m.spendMap, *outpoint) for _, spendChan := range spendChans { spendChan <- &chainntnfs.SpendDetail{ SpentOutPoint: details.SpentOutPoint, SpendingHeight: details.SpendingHeight, SpendingTx: details.SpendingTx, SpenderTxHash: details.SpenderTxHash, SpenderInputIndex: details.SpenderInputIndex, } } } } type mockChainIO struct { bestHeight int32 } var _ lnwallet.BlockChainIO = (*mockChainIO)(nil) func (m *mockChainIO) GetBestBlock() (*chainhash.Hash, int32, error) { return activeNetParams.GenesisHash, m.bestHeight, nil } func (*mockChainIO) GetUtxo(op *wire.OutPoint, _ []byte, heightHint uint32, _ <-chan struct{}) (*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 publishedTransactions chan *wire.MsgTx index uint32 utxos []*lnwallet.Utxo } // 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) (*lnwallet.Utxo, error) { utxo := &lnwallet.Utxo{ AddressType: lnwallet.WitnessPubKey, Value: 10 * btcutil.SatoshiPerBitcoin, PkScript: []byte("dummy"), Confirmations: 1, OutPoint: *prevOut, } return utxo, 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) LastUnusedAddress(addrType lnwallet.AddressType) ( btcutil.Address, error) { return nil, nil } func (*mockWalletController) IsOurAddress(a btcutil.Address) bool { return false } func (*mockWalletController) SendOutputs(outputs []*wire.TxOut, _ chainfee.SatPerKWeight) (*wire.MsgTx, error) { return nil, nil } func (*mockWalletController) CreateSimpleTx(outputs []*wire.TxOut, _ chainfee.SatPerKWeight, _ bool) (*txauthor.AuthoredTx, 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(minconfirms, maxconfirms int32) ([]*lnwallet.Utxo, error) { // If the mock already has a list of utxos, return it. if m.utxos != nil { return m.utxos, nil } // Otherwise create one to return. utxo := &lnwallet.Utxo{ AddressType: lnwallet.WitnessPubKey, Value: btcutil.Amount(10 * btcutil.SatoshiPerBitcoin), PkScript: coinPkScript, 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 }