funding

package
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 Go to latest Published: Jan 8, 2021 License: MIT Imports: 33 Imported by: 0

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Index

Constants

View Source 
const (
	// MinBtcRemoteDelay is the minimum CSV delay we will require the remote
	// to use for its commitment transaction.
	MinBtcRemoteDelay uint16 = 144

	// MaxBtcRemoteDelay is the maximum CSV delay we will require the remote
	// to use for its commitment transaction.
	MaxBtcRemoteDelay uint16 = 2016

	// MinLtcRemoteDelay is the minimum Litecoin CSV delay we will require the
	// remote to use for its commitment transaction.
	MinLtcRemoteDelay uint16 = 576

	// MaxLtcRemoteDelay is the maximum Litecoin CSV delay we will require the
	// remote to use for its commitment transaction.
	MaxLtcRemoteDelay uint16 = 8064

	// MinChanFundingSize is the smallest channel that we'll allow to be
	// created over the RPC interface.
	MinChanFundingSize = btcutil.Amount(20000)

	// MaxBtcFundingAmount is a soft-limit of the maximum channel size
	// currently accepted on the Bitcoin chain within the Lightning
	// Protocol. This limit is defined in BOLT-0002, and serves as an
	// initial precautionary limit while implementations are battle tested
	// in the real world.
	MaxBtcFundingAmount = btcutil.Amount(1<<24) - 1

	// MaxBtcFundingAmountWumbo is a soft-limit on the maximum size of wumbo
	// channels. This limit is 10 BTC and is the only thing standing between
	// you and limitless channel size (apart from 21 million cap)
	MaxBtcFundingAmountWumbo = btcutil.Amount(1000000000)

	// MaxLtcFundingAmount is a soft-limit of the maximum channel size
	// currently accepted on the Litecoin chain within the Lightning
	// Protocol.
	MaxLtcFundingAmount = MaxBtcFundingAmount * chainreg.BtcToLtcConversionRate
)
View Source 
const Subsystem = "FNDG"

Subsystem defines the logging code for this subsystem.

Variables

View Source 
var (
	// ErrFundingManagerShuttingDown is an error returned when attempting to
	// process a funding request/message but the funding manager has already
	// been signaled to shut down.
	ErrFundingManagerShuttingDown = errors.New("funding manager shutting " +
		"down")

	// ErrConfirmationTimeout is an error returned when we as a responder
	// are waiting for a funding transaction to confirm, but too many
	// blocks pass without confirmation.
	ErrConfirmationTimeout = errors.New("timeout waiting for funding " +
		"confirmation")
)
View Source 
var (

	// ErrChannelNotFound is an error returned when a channel is not known
	// to us. In this case of the fundingManager, this error is returned
	// when the channel in question is not considered being in an opening
	// state.
	ErrChannelNotFound = fmt.Errorf("channel not found")
)

Functions

func DisableLog 

func DisableLog()

DisableLog disables all logging output.

func UseLogger 

func UseLogger(logger btclog.Logger)

UseLogger uses a specified Logger to output package logging info.

func WriteOutpoint 

func WriteOutpoint(w io.Writer, o *wire.OutPoint) error

WriteOutpoint writes an outpoint to an io.Writer. This is not the same as the channeldb variant as this uses WriteVarBytes for the Hash.

Types

type Config 

type Config struct {
	// NoWumboChans indicates if we're to reject all incoming wumbo channel
	// requests, and also reject all outgoing wumbo channel requests.
	NoWumboChans bool

	// IDKey is the PublicKey that is used to identify this node within the
	// Lightning Network.
	IDKey *btcec.PublicKey

	// Wallet handles the parts of the funding process that involves moving
	// funds from on-chain transaction outputs into Lightning channels.
	Wallet *lnwallet.LightningWallet

	// PublishTransaction facilitates the process of broadcasting a
	// transaction to the network.
	PublishTransaction func(*wire.MsgTx, string) error

	// UpdateLabel updates the label that a transaction has in our wallet,
	// overwriting any existing labels.
	UpdateLabel func(chainhash.Hash, string) error

	// FeeEstimator calculates appropriate fee rates based on historical
	// transaction information.
	FeeEstimator chainfee.Estimator

	// Notifier is used by the FundingManager to determine when the
	// channel's funding transaction has been confirmed on the blockchain
	// so that the channel creation process can be completed.
	Notifier chainntnfs.ChainNotifier

	// SignMessage signs an arbitrary message with a given public key. The
	// actual digest signed is the double sha-256 of the message. In the
	// case that the private key corresponding to the passed public key
	// cannot be located, then an error is returned.
	//
	// TODO(roasbeef): should instead pass on this responsibility to a
	// distinct sub-system?
	SignMessage func(pubKey *btcec.PublicKey,
		msg []byte) (input.Signature, error)

	// CurrentNodeAnnouncement should return the latest, fully signed node
	// announcement from the backing Lightning Network node.
	CurrentNodeAnnouncement func() (lnwire.NodeAnnouncement, error)

	// SendAnnouncement is used by the FundingManager to send announcement
	// messages to the Gossiper to possibly broadcast to the greater
	// network. A set of optional message fields can be provided to populate
	// any information within the graph that is not included in the gossip
	// message.
	SendAnnouncement func(msg lnwire.Message,
		optionalFields ...discovery.OptionalMsgField) chan error

	// NotifyWhenOnline allows the FundingManager to register with a
	// subsystem that will notify it when the peer comes online. This is
	// used when sending the fundingLocked message, since it MUST be
	// delivered after the funding transaction is confirmed.
	//
	// NOTE: The peerChan channel must be buffered.
	NotifyWhenOnline func(peer [33]byte, peerChan chan<- lnpeer.Peer)

	// FindChannel queries the database for the channel with the given
	// channel ID.
	FindChannel func(chanID lnwire.ChannelID) (*channeldb.OpenChannel, error)

	// TempChanIDSeed is a cryptographically random string of bytes that's
	// used as a seed to generate pending channel ID's.
	TempChanIDSeed [32]byte

	// DefaultRoutingPolicy is the default routing policy used when
	// initially announcing channels.
	DefaultRoutingPolicy htlcswitch.ForwardingPolicy

	// DefaultMinHtlcIn is the default minimum incoming htlc value that is
	// set as a channel parameter.
	DefaultMinHtlcIn lnwire.MilliSatoshi

	// NumRequiredConfs is a function closure that helps the funding
	// manager decide how many confirmations it should require for a
	// channel extended to it. The function is able to take into account
	// the amount of the channel, and any funds we'll be pushed in the
	// process to determine how many confirmations we'll require.
	NumRequiredConfs func(btcutil.Amount, lnwire.MilliSatoshi) uint16

	// RequiredRemoteDelay is a function that maps the total amount in a
	// proposed channel to the CSV delay that we'll require for the remote
	// party. Naturally a larger channel should require a higher CSV delay
	// in order to give us more time to claim funds in the case of a
	// contract breach.
	RequiredRemoteDelay func(btcutil.Amount) uint16

	// RequiredRemoteChanReserve is a function closure that, given the
	// channel capacity and dust limit, will return an appropriate amount
	// for the remote peer's required channel reserve that is to be adhered
	// to at all times.
	RequiredRemoteChanReserve func(capacity, dustLimit btcutil.Amount) btcutil.Amount

	// RequiredRemoteMaxValue is a function closure that, given the channel
	// capacity, returns the amount of MilliSatoshis that our remote peer
	// can have in total outstanding HTLCs with us.
	RequiredRemoteMaxValue func(btcutil.Amount) lnwire.MilliSatoshi

	// RequiredRemoteMaxHTLCs is a function closure that, given the channel
	// capacity, returns the number of maximum HTLCs the remote peer can
	// offer us.
	RequiredRemoteMaxHTLCs func(btcutil.Amount) uint16

	// WatchNewChannel is to be called once a new channel enters the final
	// funding stage: waiting for on-chain confirmation. This method sends
	// the channel to the ChainArbitrator so it can watch for any on-chain
	// events related to the channel. We also provide the public key of the
	// node we're establishing a channel with for reconnection purposes.
	WatchNewChannel func(*channeldb.OpenChannel, *btcec.PublicKey) error

	// ReportShortChanID allows the funding manager to report the newly
	// discovered short channel ID of a formerly pending channel to outside
	// sub-systems.
	ReportShortChanID func(wire.OutPoint) error

	// ZombieSweeperInterval is the periodic time interval in which the
	// zombie sweeper is run.
	ZombieSweeperInterval time.Duration

	// ReservationTimeout is the length of idle time that must pass before
	// a reservation is considered a zombie.
	ReservationTimeout time.Duration

	// MinChanSize is the smallest channel size that we'll accept as an
	// inbound channel. We have such a parameter, as otherwise, nodes could
	// flood us with very small channels that would never really be usable
	// due to fees.
	MinChanSize btcutil.Amount

	// MaxChanSize is the largest channel size that we'll accept as an
	// inbound channel. We have such a parameter, so that you may decide how
	// WUMBO you would like your channel.
	MaxChanSize btcutil.Amount

	// MaxPendingChannels is the maximum number of pending channels we
	// allow for each peer.
	MaxPendingChannels int

	// RejectPush is set true if the fundingmanager should reject any
	// incoming channels having a non-zero push amount.
	RejectPush bool

	// MaxLocalCSVDelay is the maximum csv delay we will allow for our
	// commit output. Channels that exceed this value will be failed.
	MaxLocalCSVDelay uint16

	// NotifyOpenChannelEvent informs the ChannelNotifier when channels
	// transition from pending open to open.
	NotifyOpenChannelEvent func(wire.OutPoint)

	// OpenChannelPredicate is a predicate on the lnwire.OpenChannel message
	// and on the requesting node's public key that returns a bool which tells
	// the funding manager whether or not to accept the channel.
	OpenChannelPredicate chanacceptor.ChannelAcceptor

	// NotifyPendingOpenChannelEvent informs the ChannelNotifier when channels
	// enter a pending state.
	NotifyPendingOpenChannelEvent func(wire.OutPoint, *channeldb.OpenChannel)

	// EnableUpfrontShutdown specifies whether the upfront shutdown script
	// is enabled.
	EnableUpfrontShutdown bool

	// RegisteredChains keeps track of all chains that have been registered
	// with the daemon.
	RegisteredChains *chainreg.ChainRegistry

	// MaxAnchorsCommitFeeRate is the max commitment fee rate we'll use as
	// the initiator for channels of the anchor type.
	MaxAnchorsCommitFeeRate chainfee.SatPerKWeight
}

Config defines the configuration for the FundingManager. All elements within the configuration MUST be non-nil for the FundingManager to carry out its duties.

type Controller 

type Controller interface {
	// ProcessFundingMsg processes a funding message represented by the
	// lnwire.Message parameter along with the Peer object representing a
	// connection to the counterparty.
	ProcessFundingMsg(lnwire.Message, lnpeer.Peer)

	// IsPendingChannel returns whether a particular 32-byte identifier
	// represents a pending channel in the Controller implementation.
	IsPendingChannel([32]byte, lnpeer.Peer) bool
}

Controller is an interface with basic funding flow functions. It describes the basic functionality of a funding manager. It should at a minimum process a subset of lnwire messages that are denoted as funding messages.

type InitFundingMsg 

type InitFundingMsg struct {
	// Peer is the peer that we want to open a channel to.
	Peer lnpeer.Peer

	// TargetPubkey is the public key of the peer.
	TargetPubkey *btcec.PublicKey

	// ChainHash is the target genesis hash for this channel.
	ChainHash chainhash.Hash

	// SubtractFees set to true means that fees will be subtracted
	// from the LocalFundingAmt.
	SubtractFees bool

	// LocalFundingAmt is the size of the channel.
	LocalFundingAmt btcutil.Amount

	// PushAmt is the amount pushed to the counterparty.
	PushAmt lnwire.MilliSatoshi

	// FundingFeePerKw is the fee for the funding transaction.
	FundingFeePerKw chainfee.SatPerKWeight

	// Private determines whether or not this channel will be private.
	Private bool

	// MinHtlcIn is the minimum incoming HTLC that we accept.
	MinHtlcIn lnwire.MilliSatoshi

	// RemoteCsvDelay is the CSV delay we require for the remote peer.
	RemoteCsvDelay uint16

	// MinConfs indicates the minimum number of confirmations that each
	// output selected to fund the channel should satisfy.
	MinConfs int32

	// ShutdownScript is an optional upfront shutdown script for the
	// channel. This value is optional, so may be nil.
	ShutdownScript lnwire.DeliveryAddress

	// MaxValueInFlight is the maximum amount of coins in MilliSatoshi
	// that can be pending within the channel. It only applies to the
	// remote party.
	MaxValueInFlight lnwire.MilliSatoshi

	// MaxHtlcs is the maximum number of HTLCs that the remote peer
	// can offer us.
	MaxHtlcs uint16

	// MaxLocalCsv is the maximum local csv delay we will accept from our
	// peer.
	MaxLocalCsv uint16

	// ChanFunder is an optional channel funder that allows the caller to
	// control exactly how the channel funding is carried out. If not
	// specified, then the default chanfunding.WalletAssembler will be
	// used.
	ChanFunder chanfunding.Assembler

	// PendingChanID is not all zeroes (the default value), then this will
	// be the pending channel ID used for the funding flow within the wire
	// protocol.
	PendingChanID [32]byte

	// Updates is a channel which updates to the opening status of the channel
	// are sent on.
	Updates chan *lnrpc.OpenStatusUpdate

	// Err is a channel which errors encountered during the funding flow are
	// sent on.
	Err chan error
}

InitFundingMsg is sent by an outside subsystem to the funding manager in order to kick off a funding workflow with a specified target peer. The original request which defines the parameters of the funding workflow are embedded within this message giving the funding manager full context w.r.t the workflow.

type Manager 

type Manager struct {
	// contains filtered or unexported fields
}

Manager acts as an orchestrator/bridge between the wallet's 'ChannelReservation' workflow, and the wire protocol's funding initiation messages. Any requests to initiate the funding workflow for a channel, either kicked-off locally or remotely are handled by the funding manager. Once a channel's funding workflow has been completed, any local callers, the local peer, and possibly the remote peer are notified of the completion of the channel workflow. Additionally, any temporary or permanent access controls between the wallet and remote peers are enforced via the funding manager.

func NewFundingManager 

func NewFundingManager(cfg Config) (*Manager, error)

NewFundingManager creates and initializes a new instance of the fundingManager.

func (*Manager) CancelPeerReservations 

func (f *Manager) CancelPeerReservations(nodePub [33]byte)

CancelPeerReservations cancels all active reservations associated with the passed node. This will ensure any outputs which have been pre committed, (and thus locked from coin selection), are properly freed.

func (*Manager) InitFundingWorkflow 

func (f *Manager) InitFundingWorkflow(msg *InitFundingMsg)

InitFundingWorkflow sends a message to the funding manager instructing it to initiate a single funder workflow with the source peer. TODO(roasbeef): re-visit blocking nature..

func (*Manager) IsPendingChannel 

func (f *Manager) IsPendingChannel(pendingChanID [32]byte,
	peer lnpeer.Peer) bool

IsPendingChannel returns a boolean indicating whether the channel identified by the pendingChanID and given peer is pending, meaning it is in the process of being funded. After the funding transaction has been confirmed, the channel will receive a new, permanent channel ID, and will no longer be considered pending.

func (*Manager) ProcessFundingMsg 

func (f *Manager) ProcessFundingMsg(msg lnwire.Message, peer lnpeer.Peer)

ProcessFundingMsg sends a message to the internal fundingManager goroutine, allowing it to handle the lnwire.Message.

func (*Manager) Start 

func (f *Manager) Start() error

Start launches all helper goroutines required for handling requests sent to the funding manager.

func (*Manager) Stop 

func (f *Manager) Stop()

Stop signals all helper goroutines to execute a graceful shutdown. This method will block until all goroutines have exited.

Source Files

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