122 lines
4.3 KiB
Go
122 lines
4.3 KiB
Go
package wtdb
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import (
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"errors"
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"github.com/btcsuite/btcd/btcec"
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"github.com/lightningnetwork/lnd/lnwire"
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"github.com/lightningnetwork/lnd/watchtower/wtpolicy"
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)
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var (
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// ErrClientSessionNotFound signals that the requested client session
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// was not found in the database.
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ErrClientSessionNotFound = errors.New("client session not found")
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// ErrUpdateAlreadyCommitted signals that the chosen sequence number has
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// already been committed to an update with a different breach hint.
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ErrUpdateAlreadyCommitted = errors.New("update already committed")
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// ErrCommitUnorderedUpdate signals the client tried to commit a
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// sequence number other than the next unallocated sequence number.
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ErrCommitUnorderedUpdate = errors.New("update seqnum not monotonic")
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// ErrCommittedUpdateNotFound signals that the tower tried to ACK a
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// sequence number that has not yet been allocated by the client.
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ErrCommittedUpdateNotFound = errors.New("committed update not found")
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// ErrUnallocatedLastApplied signals that the tower tried to provide a
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// LastApplied value greater than any allocated sequence number.
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ErrUnallocatedLastApplied = errors.New("tower echoed last appiled " +
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"greater than allocated seqnum")
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// ErrNoReservedKeyIndex signals that a client session could not be
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// created because no session key index was reserved.
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ErrNoReservedKeyIndex = errors.New("key index not reserved")
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// ErrIncorrectKeyIndex signals that the client session could not be
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// created because session key index differs from the reserved key
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// index.
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ErrIncorrectKeyIndex = errors.New("incorrect key index")
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)
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// ClientSession encapsulates a SessionInfo returned from a successful
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// session negotiation, and also records the tower and ephemeral secret used for
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// communicating with the tower.
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type ClientSession struct {
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// ID is the client's public key used when authenticating with the
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// tower.
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ID SessionID
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// SeqNum is the next unallocated sequence number that can be sent to
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// the tower.
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SeqNum uint16
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// TowerLastApplied the last last-applied the tower has echoed back.
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TowerLastApplied uint16
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// TowerID is the unique, db-assigned identifier that references the
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// Tower with which the session is negotiated.
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TowerID uint64
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// Tower holds the pubkey and address of the watchtower.
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//
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// NOTE: This value is not serialized. It is recovered by looking up the
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// tower with TowerID.
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Tower *Tower
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// KeyIndex is the index of key locator used to derive the client's
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// session key so that it can authenticate with the tower to update its
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// session. In order to rederive the private key, the key locator should
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// use the keychain.KeyFamilyTowerSession key family.
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KeyIndex uint32
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// SessionPrivKey is the ephemeral secret key used to connect to the
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// watchtower.
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//
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// NOTE: This value is not serialized. It is derived using the KeyIndex
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// on startup to avoid storing private keys on disk.
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SessionPrivKey *btcec.PrivateKey
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// Policy holds the negotiated session parameters.
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Policy wtpolicy.Policy
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// RewardPkScript is the pkscript that the tower's reward will be
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// deposited to if a sweep transaction confirms and the sessions
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// specifies a reward output.
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RewardPkScript []byte
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// CommittedUpdates is a map from allocated sequence numbers to unacked
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// updates. These updates can be resent after a restart if the update
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// failed to send or receive an acknowledgment.
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CommittedUpdates map[uint16]*CommittedUpdate
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// AckedUpdates is a map from sequence number to backup id to record
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// which revoked states were uploaded via this session.
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AckedUpdates map[uint16]BackupID
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}
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// BackupID identifies a particular revoked, remote commitment by channel id and
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// commitment height.
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type BackupID struct {
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// ChanID is the channel id of the revoked commitment.
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ChanID lnwire.ChannelID
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// CommitHeight is the commitment height of the revoked commitment.
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CommitHeight uint64
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}
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// CommittedUpdate holds a state update sent by a client along with its
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// SessionID.
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type CommittedUpdate struct {
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BackupID BackupID
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// Hint is the 16-byte prefix of the revoked commitment transaction ID.
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Hint BreachHint
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// EncryptedBlob is a ciphertext containing the sweep information for
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// exacting justice if the commitment transaction matching the breach
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// hint is broadcast.
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EncryptedBlob []byte
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}
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