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