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peer: add channel close fee negotiation
This commit adds the fee negotiation procedure performed on channel shutdown. The current algorithm picks an ideal a fee based on the FeeEstimator and commit weigth, then accepts the remote's fee if it is at most 50%-200% away from the ideal. The fee negotiation procedure is similar both as sender and receiver of the initial shutdown message, and this commit also make both sides use the same code path for handling these messages.
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package main | ||
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import ( | ||
"github.com/lightningnetwork/lnd/chainntnfs" | ||
"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" | ||
) | ||
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type mockSigner struct { | ||
key *btcec.PrivateKey | ||
} | ||
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func (m *mockSigner) SignOutputRaw(tx *wire.MsgTx, | ||
signDesc *lnwallet.SignDescriptor) ([]byte, error) { | ||
amt := signDesc.Output.Value | ||
witnessScript := signDesc.WitnessScript | ||
privKey := m.key | ||
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sig, err := txscript.RawTxInWitnessSignature(tx, signDesc.SigHashes, | ||
signDesc.InputIndex, amt, witnessScript, txscript.SigHashAll, privKey) | ||
if err != nil { | ||
return nil, err | ||
} | ||
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return sig[:len(sig)-1], nil | ||
} | ||
func (m *mockSigner) ComputeInputScript(tx *wire.MsgTx, | ||
signDesc *lnwallet.SignDescriptor) (*lnwallet.InputScript, error) { | ||
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witnessScript, err := txscript.WitnessScript(tx, signDesc.SigHashes, | ||
signDesc.InputIndex, signDesc.Output.Value, signDesc.Output.PkScript, | ||
txscript.SigHashAll, m.key, true) | ||
if err != nil { | ||
return nil, err | ||
} | ||
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return &lnwallet.InputScript{ | ||
Witness: witnessScript, | ||
}, nil | ||
} | ||
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type mockNotfier struct { | ||
confChannel chan *chainntnfs.TxConfirmation | ||
} | ||
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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 nil, nil | ||
} | ||
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func (m *mockNotfier) Start() error { | ||
return nil | ||
} | ||
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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 | ||
} | ||
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type mockChainIO struct{} | ||
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func (m *mockChainIO) GetBestBlock() (*chainhash.Hash, int32, error) { | ||
return nil, 0, nil | ||
} | ||
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func (m *mockChainIO) GetUtxo(op *wire.OutPoint, | ||
heightHint uint32) (*wire.TxOut, error) { | ||
return nil, nil | ||
} | ||
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func (m *mockChainIO) GetBlockHash(blockHeight int64) (*chainhash.Hash, error) { | ||
return nil, nil | ||
} | ||
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func (m *mockChainIO) GetBlock( | ||
blockHash *chainhash.Hash) (*wire.MsgBlock, error) { | ||
return nil, nil | ||
} | ||
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type mockWalletController struct { | ||
publTxChan chan *wire.MsgTx | ||
} | ||
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func (m *mockWalletController) FetchInputInfo( | ||
prevOut *wire.OutPoint) (*wire.TxOut, error) { | ||
return nil, nil | ||
} | ||
func (m *mockWalletController) ConfirmedBalance(confs int32, | ||
witness bool) (btcutil.Amount, error) { | ||
return 0, nil | ||
} | ||
func (m *mockWalletController) NewAddress(addrType lnwallet.AddressType, | ||
change bool) (btcutil.Address, error) { | ||
randBytes := []byte("1234567") | ||
pubkeyHash := btcutil.Hash160(randBytes) | ||
return btcutil.NewAddressWitnessPubKeyHash(pubkeyHash, | ||
&chaincfg.SimNetParams) | ||
} | ||
func (m *mockWalletController) GetPrivKey( | ||
a btcutil.Address) (*btcec.PrivateKey, error) { | ||
return nil, nil | ||
} | ||
func (m *mockWalletController) NewRawKey() (*btcec.PublicKey, error) { | ||
return nil, nil | ||
} | ||
func (m *mockWalletController) FetchRootKey() (*btcec.PrivateKey, error) { | ||
return nil, nil | ||
} | ||
func (m *mockWalletController) SendOutputs( | ||
outputs []*wire.TxOut) (*chainhash.Hash, error) { | ||
return nil, nil | ||
} | ||
func (m *mockWalletController) ListUnspentWitness( | ||
confirms int32) ([]*lnwallet.Utxo, error) { | ||
return nil, nil | ||
} | ||
func (m *mockWalletController) ListTransactionDetails() ([]*lnwallet.TransactionDetail, error) { | ||
return nil, nil | ||
} | ||
func (m *mockWalletController) LockOutpoint(o wire.OutPoint) { | ||
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} | ||
func (m *mockWalletController) UnlockOutpoint(o wire.OutPoint) { | ||
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} | ||
func (m *mockWalletController) PublishTransaction(tx *wire.MsgTx) error { | ||
m.publTxChan <- tx | ||
return nil | ||
} | ||
func (m *mockWalletController) SubscribeTransactions() (lnwallet.TransactionSubscription, error) { | ||
return nil, nil | ||
} | ||
func (m *mockWalletController) IsSynced() (bool, error) { | ||
return false, nil | ||
} | ||
func (m *mockWalletController) Start() error { | ||
return nil | ||
} | ||
func (m *mockWalletController) Stop() error { | ||
return nil | ||
} |
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