package server import ( "io" "net" "time" "github.com/btcsuite/btcd/btcec" "github.com/lightningnetwork/lnd/watchtower/wtdb" ) // Interface represents a simple, listen-only service that accepts watchtower // clients, and provides responses to their requests. type Interface interface { // InboundPeerConnected accepts a new watchtower client, and handles any // requests sent by the peer. InboundPeerConnected(Peer) // Start sets up the watchtower server. Start() error // Stop cleans up the watchtower's current connections and resources. Stop() error } // Peer is the primary interface used to abstract watchtower clients. type Peer interface { io.WriteCloser // ReadNextMessage pulls the next framed message from the client. ReadNextMessage() ([]byte, error) // SetWriteDeadline specifies the time by which the client must have // read a message sent by the server. In practice, the connection is // buffered, so the client must read enough from the connection to // support the server adding another reply. SetWriteDeadline(time.Time) error // SetReadDeadline specifies the time by which the client must send // another message. SetReadDeadline(time.Time) error // RemotePub returns the client's public key. RemotePub() *btcec.PublicKey // RemoteAddr returns the client's network address. RemoteAddr() net.Addr } // DB provides the server access to session creation and retrieval, as well as // persisting state updates sent by clients. type DB interface { // InsertSessionInfo saves a newly agreed-upon session from a client. // This method should fail if a session with the same session id already // exists. InsertSessionInfo(*wtdb.SessionInfo) error // GetSessionInfo retrieves the SessionInfo associated with the session // id, if it exists. GetSessionInfo(*wtdb.SessionID) (*wtdb.SessionInfo, error) // InsertStateUpdate persists a state update sent by a client, and // validates the update against the current SessionInfo stored under the // update's session id.. InsertStateUpdate(*wtdb.SessionStateUpdate) (uint16, error) }