chancloser

Documentation

Index

• Variables
• func DisableLog()
• func ParseUpfrontShutdownAddress(address string, params *chaincfg.Params) (lnwire.DeliveryAddress, error)
• func UseLogger(logger btclog.Logger)
• type ChanCloseCfg
• type ChanCloser
  • func NewChanCloser(cfg ChanCloseCfg, deliveryScript []byte, idealFeePerKw chainfee.SatPerKWeight, ...) *ChanCloser
  • func (c *ChanCloser) Channel() *lnwallet.LightningChannel
  • func (c *ChanCloser) CloseRequest() *htlcswitch.ChanClose
  • func (c *ChanCloser) ClosingTx() (*wire.MsgTx, error)
  • func (c *ChanCloser) NegotiationHeight() uint32
  • func (c *ChanCloser) ProcessCloseMsg(msg lnwire.Message) ([]lnwire.Message, bool, error)
  • func (c *ChanCloser) ShutdownChan() (*lnwire.Shutdown, error)

Variables

var (
	// ErrChanAlreadyClosing is returned when a channel shutdown is attempted
	// more than once.
	ErrChanAlreadyClosing = fmt.Errorf("channel shutdown already initiated")

	// ErrChanCloseNotFinished is returned when a caller attempts to access
	// a field or function that is contingent on the channel closure negotiation
	// already being completed.
	ErrChanCloseNotFinished = fmt.Errorf("close negotiation not finished")

	// ErrInvalidState is returned when the closing state machine receives a
	// message while it is in an unknown state.
	ErrInvalidState = fmt.Errorf("invalid state")

	// ErrUpfrontShutdownScriptMismatch is returned when a peer or end user
	// provides a cooperative close script which does not match the upfront
	// shutdown script previously set for that party.
	ErrUpfrontShutdownScriptMismatch = fmt.Errorf("shutdown script does not " +
		"match upfront shutdown script")
)

Functions

func DisableLog

func DisableLog()

DisableLog disables all logging output.

func ParseUpfrontShutdownAddress

func ParseUpfrontShutdownAddress(address string,
	params *chaincfg.Params) (lnwire.DeliveryAddress, error)

ParseUpfrontShutdownAddress attempts to parse an upfront shutdown address. If the address is empty, it returns nil. If it successfully decoded the address, it returns a script that pays out to the address.

func UseLogger

func UseLogger(logger btclog.Logger)

UseLogger uses a specified Logger to output package logging info.

Types

type ChanCloseCfg

type ChanCloseCfg struct {
	// Channel is the channel that should be closed.
	Channel *lnwallet.LightningChannel

	// UnregisterChannel is a function closure that allows the ChanCloser to
	// unregister a channel. Once this has been done, no further HTLC's should
	// be routed through the channel.
	UnregisterChannel func(lnwire.ChannelID)

	// BroadcastTx broadcasts the passed transaction to the network.
	BroadcastTx func(*wire.MsgTx, string) error

	// DisableChannel disables a channel, resulting in it not being able to
	// forward payments.
	DisableChannel func(wire.OutPoint) error

	// Disconnect will disconnect from the remote peer in this close.
	Disconnect func() error

	// Quit is a channel that should be sent upon in the occasion the state
	// machine should cease all progress and shutdown.
	Quit chan struct{}
}

ChanCloseCfg holds all the items that a ChanCloser requires to carry out its duties.

type ChanCloser

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

ChanCloser is a state machine that handles the cooperative channel closure procedure. This includes shutting down a channel, marking it ineligible for routing HTLC's, negotiating fees with the remote party, and finally broadcasting the fully signed closure transaction to the network.

func NewChanCloser

func NewChanCloser(cfg ChanCloseCfg, deliveryScript []byte,
	idealFeePerKw chainfee.SatPerKWeight, negotiationHeight uint32,
	closeReq *htlcswitch.ChanClose, locallyInitiated bool) *ChanCloser

NewChanCloser creates a new instance of the channel closure given the passed configuration, and delivery+fee preference. The final argument should only be populated iff, we're the initiator of this closing request.

func (*ChanCloser) Channel

func (c *ChanCloser) Channel() *lnwallet.LightningChannel

Channel returns the channel stored in the config.

func (*ChanCloser) CloseRequest

func (c *ChanCloser) CloseRequest() *htlcswitch.ChanClose

CloseRequest returns the original close request that prompted the creation of the state machine.

NOTE: This will only return a non-nil pointer if we were the initiator of the cooperative closure workflow.

func (*ChanCloser) ClosingTx

func (c *ChanCloser) ClosingTx() (*wire.MsgTx, error)

ClosingTx returns the fully signed, final closing transaction.

NOTE: This transaction is only available if the state machine is in the closeFinished state.

func (*ChanCloser) NegotiationHeight

func (c *ChanCloser) NegotiationHeight() uint32

NegotiationHeight returns the negotiation height.

func (*ChanCloser) ProcessCloseMsg

func (c *ChanCloser) ProcessCloseMsg(msg lnwire.Message) ([]lnwire.Message,
	bool, error)

ProcessCloseMsg attempts to process the next message in the closing series. This method will update the state accordingly and return two primary values: the next set of messages to be sent, and a bool indicating if the fee negotiation process has completed. If the second value is true, then this means the ChanCloser can be garbage collected.

func (*ChanCloser) ShutdownChan

func (c *ChanCloser) ShutdownChan() (*lnwire.Shutdown, error)

ShutdownChan is the first method that's to be called by the initiator of the cooperative channel closure. This message returns the shutdown message to send to the remote party. Upon completion, we enter the closeShutdownInitiated phase as we await a response.