package main import ( "crypto/sha256" "fmt" "sync" "github.com/lightningnetwork/lnd/chainntnfs" "github.com/lightningnetwork/lnd/keychain" "github.com/lightningnetwork/lnd/lnwallet" "github.com/roasbeef/btcd/btcec" "github.com/roasbeef/btcd/chaincfg" "github.com/roasbeef/btcd/chaincfg/chainhash" "github.com/roasbeef/btcd/txscript" "github.com/roasbeef/btcd/wire" "github.com/roasbeef/btcutil" ) // 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, 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, 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 } 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, heightHint uint32) (*chainntnfs.SpendEvent, error) { 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) { 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, 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 } // 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, witness bool) (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.SatPerVByte) (*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 (*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: 0, }, } 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 }