70 lines
2.6 KiB
Go
70 lines
2.6 KiB
Go
package lookout
|
|
|
|
import (
|
|
"github.com/btcsuite/btcd/chaincfg/chainhash"
|
|
"github.com/btcsuite/btcd/wire"
|
|
"github.com/lightningnetwork/lnd/chainntnfs"
|
|
"github.com/lightningnetwork/lnd/watchtower/blob"
|
|
"github.com/lightningnetwork/lnd/watchtower/wtdb"
|
|
)
|
|
|
|
// Service abstracts the lookout functionality, supporting the ability to start
|
|
// and stop. All communication and actions are driven via the database or chain
|
|
// events.
|
|
type Service interface {
|
|
// Start safely starts up the Interface.
|
|
Start() error
|
|
|
|
// Stop safely stops the Interface.
|
|
Stop() error
|
|
}
|
|
|
|
// BlockFetcher supports the ability to fetch blocks from the backend or
|
|
// network.
|
|
type BlockFetcher interface {
|
|
// GetBlock fetches the block given the target block hash.
|
|
GetBlock(*chainhash.Hash) (*wire.MsgBlock, error)
|
|
}
|
|
|
|
// DB abstracts the required persistent calls expected by the lookout. DB
|
|
// provides the ability to search for state updates that correspond to breach
|
|
// transactions confirmed in a particular block.
|
|
type DB interface {
|
|
// GetLookoutTip returns the last block epoch at which the tower
|
|
// performed a match. If no match has been done, a nil epoch will be
|
|
// returned.
|
|
GetLookoutTip() (*chainntnfs.BlockEpoch, error)
|
|
|
|
// QueryMatches searches its database for any state updates matching the
|
|
// provided breach hints. If any matches are found, they will be
|
|
// returned along with encrypted blobs so that justice can be exacted.
|
|
QueryMatches([]blob.BreachHint) ([]wtdb.Match, error)
|
|
|
|
// SetLookoutTip writes the best epoch for which the watchtower has
|
|
// queried for breach hints.
|
|
SetLookoutTip(*chainntnfs.BlockEpoch) error
|
|
}
|
|
|
|
// EpochRegistrar supports the ability to register for events corresponding to
|
|
// newly created blocks.
|
|
type EpochRegistrar interface {
|
|
// RegisterBlockEpochNtfn registers for a new block epoch subscription.
|
|
// The implementation must support historical dispatch, starting from
|
|
// the provided chainntnfs.BlockEpoch when it is non-nil. The
|
|
// notifications should be delivered in-order, and deliver reorged
|
|
// blocks.
|
|
RegisterBlockEpochNtfn(
|
|
*chainntnfs.BlockEpoch) (*chainntnfs.BlockEpochEvent, error)
|
|
}
|
|
|
|
// Punisher handles the construction and publication of justice transactions
|
|
// once they have been detected by the Service.
|
|
type Punisher interface {
|
|
// Punish accepts a JusticeDescriptor, constructs the justice
|
|
// transaction, and publishes the transaction to the network so it can
|
|
// be mined. The second parameter is a quit channel so that long-running
|
|
// operations required to track the confirmation of the transaction can
|
|
// be canceled on shutdown.
|
|
Punish(*JusticeDescriptor, <-chan struct{}) error
|
|
}
|