lnd.xprv/htlcswitch/interfaces.go
2019-05-03 12:22:36 +02:00

161 lines
6.7 KiB
Go

package htlcswitch
import (
"github.com/btcsuite/btcd/wire"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/invoices"
"github.com/lightningnetwork/lnd/lnpeer"
"github.com/lightningnetwork/lnd/lntypes"
"github.com/lightningnetwork/lnd/lnwire"
)
// InvoiceDatabase is an interface which represents the persistent subsystem
// which may search, lookup and settle invoices.
type InvoiceDatabase interface {
// LookupInvoice attempts to look up an invoice according to its 32
// byte payment hash. This method should also reutrn the min final CLTV
// delta for this invoice. We'll use this to ensure that the HTLC
// extended to us gives us enough time to settle as we prescribe.
LookupInvoice(lntypes.Hash) (channeldb.Invoice, uint32, error)
// NotifyExitHopHtlc attempts to mark an invoice as settled. If the
// invoice is a debug invoice, then this method is a noop as debug
// invoices are never fully settled. The return value describes how the
// htlc should be resolved. If the htlc cannot be resolved immediately,
// the resolution is sent on the passed in hodlChan later.
NotifyExitHopHtlc(payHash lntypes.Hash, paidAmount lnwire.MilliSatoshi,
hodlChan chan<- interface{}) (*invoices.HodlEvent, error)
// CancelInvoice attempts to cancel the invoice corresponding to the
// passed payment hash.
CancelInvoice(payHash lntypes.Hash) error
// SettleHodlInvoice settles a hold invoice.
SettleHodlInvoice(preimage lntypes.Preimage) error
// HodlUnsubscribeAll unsubscribes from all hodl events.
HodlUnsubscribeAll(subscriber chan<- interface{})
}
// ChannelLink is an interface which represents the subsystem for managing the
// incoming htlc requests, applying the changes to the channel, and also
// propagating/forwarding it to htlc switch.
//
// abstraction level
// ^
// |
// | - - - - - - - - - - - - Lightning - - - - - - - - - - - - -
// |
// | (Switch) (Switch) (Switch)
// | Alice <-- channel link --> Bob <-- channel link --> Carol
// |
// | - - - - - - - - - - - - - TCP - - - - - - - - - - - - - - -
// |
// | (Peer) (Peer) (Peer)
// | Alice <----- tcp conn --> Bob <---- tcp conn -----> Carol
// |
//
type ChannelLink interface {
// TODO(roasbeef): modify interface to embed mail boxes?
// HandleSwitchPacket handles the switch packets. This packets might be
// forwarded to us from another channel link in case the htlc update
// came from another peer or if the update was created by user
// initially.
//
// NOTE: This function MUST be non-blocking (or block as little as
// possible).
HandleSwitchPacket(*htlcPacket) error
// HandleChannelUpdate handles the htlc requests as settle/add/fail
// which sent to us from remote peer we have a channel with.
//
// NOTE: This function MUST be non-blocking (or block as little as
// possible).
HandleChannelUpdate(lnwire.Message)
// ChannelPoint returns the channel outpoint for the channel link.
ChannelPoint() *wire.OutPoint
// ChanID returns the channel ID for the channel link. The channel ID
// is a more compact representation of a channel's full outpoint.
ChanID() lnwire.ChannelID
// ShortChanID returns the short channel ID for the channel link. The
// short channel ID encodes the exact location in the main chain that
// the original funding output can be found.
ShortChanID() lnwire.ShortChannelID
// UpdateShortChanID updates the short channel ID for a link. This may
// be required in the event that a link is created before the short
// chan ID for it is known, or a re-org occurs, and the funding
// transaction changes location within the chain.
UpdateShortChanID() (lnwire.ShortChannelID, error)
// UpdateForwardingPolicy updates the forwarding policy for the target
// ChannelLink. Once updated, the link will use the new forwarding
// policy to govern if it an incoming HTLC should be forwarded or not.
UpdateForwardingPolicy(ForwardingPolicy)
// HtlcSatifiesPolicy should return a nil error if the passed HTLC
// details satisfy the current forwarding policy fo the target link.
// Otherwise, a valid protocol failure message should be returned in
// order to signal to the source of the HTLC, the policy consistency
// issue.
HtlcSatifiesPolicy(payHash [32]byte, incomingAmt lnwire.MilliSatoshi,
amtToForward lnwire.MilliSatoshi,
incomingTimeout, outgoingTimeout uint32,
heightNow uint32) lnwire.FailureMessage
// HtlcSatifiesPolicyLocal should return a nil error if the passed HTLC
// details satisfy the current channel policy. Otherwise, a valid
// protocol failure message should be returned in order to signal the
// violation. This call is intended to be used for locally initiated
// payments for which there is no corresponding incoming htlc.
HtlcSatifiesPolicyLocal(payHash [32]byte, amt lnwire.MilliSatoshi,
timeout uint32, heightNow uint32) lnwire.FailureMessage
// Bandwidth returns the amount of milli-satoshis which current link
// might pass through channel link. The value returned from this method
// represents the up to date available flow through the channel. This
// takes into account any forwarded but un-cleared HTLC's, and any
// HTLC's which have been set to the over flow queue.
Bandwidth() lnwire.MilliSatoshi
// Stats return the statistics of channel link. Number of updates,
// total sent/received milli-satoshis.
Stats() (uint64, lnwire.MilliSatoshi, lnwire.MilliSatoshi)
// Peer returns the representation of remote peer with which we have
// the channel link opened.
Peer() lnpeer.Peer
// EligibleToForward returns a bool indicating if the channel is able
// to actively accept requests to forward HTLC's. A channel may be
// active, but not able to forward HTLC's if it hasn't yet finalized
// the pre-channel operation protocol with the remote peer. The switch
// will use this function in forwarding decisions accordingly.
EligibleToForward() bool
// AttachMailBox delivers an active MailBox to the link. The MailBox may
// have buffered messages.
AttachMailBox(MailBox)
// Start/Stop are used to initiate the start/stop of the channel link
// functioning.
Start() error
Stop()
}
// ForwardingLog is an interface that represents a time series database which
// keep track of all successfully completed payment circuits. Every few
// seconds, the switch will collate and flush out all the successful payment
// circuits during the last interval.
type ForwardingLog interface {
// AddForwardingEvents is a method that should write out the set of
// forwarding events in a batch to persistent storage. Outside
// sub-systems can then query the contents of the log for analysis,
// visualizations, etc.
AddForwardingEvents([]channeldb.ForwardingEvent) error
}