//! Various user-configurable channel limits and settings which ChannelManager
//! applies for you.
+use ln::channelmanager::{BREAKDOWN_TIMEOUT, MAX_LOCAL_BREAKDOWN_TIMEOUT};
+
/// Top-level config which holds ChannelHandshakeLimits and ChannelConfig.
#[derive(Clone, Debug)]
pub struct UserConfig {
/// Applied only for inbound channels (see ChannelHandshakeLimits::max_minimum_depth for the
/// equivalent limit applied to outbound channels).
pub minimum_depth: u32,
+ /// Set to the amount of time we require our counterparty to wait to claim their money.
+ ///
+ /// It's one of the main parameter of our security model. We (or one of our watchtowers) MUST
+ /// be online to check for peer having broadcast a revoked transaction to steal our funds
+ /// at least once every our_to_self_delay blocks.
+ /// Default is BREAKDOWN_TIMEOUT, we enforce it as a minimum at channel opening so you can
+ /// tweak config to ask for more security, not less.
+ ///
+ /// Meanwhile, asking for a too high delay, we bother peer to freeze funds for nothing in
+ /// case of an honest unilateral channel close, which implicitly decrease the economic value of
+ /// our channel.
+ pub our_to_self_delay: u16,
}
impl ChannelHandshakeConfig {
pub fn new() -> ChannelHandshakeConfig {
ChannelHandshakeConfig {
minimum_depth: 6,
+ our_to_self_delay: BREAKDOWN_TIMEOUT,
}
}
}
/// Defaults to true to make the default that no announced channels are possible (which is
/// appropriate for any nodes which are not online very reliably).
pub force_announced_channel_preference: bool,
+ /// Set to the amount of time we're willing to wait to claim money back to us.
+ ///
+ /// Not checking this value would be a security issue, as our peer would be able to set it to
+ /// max relative lock-time (a year) and we would "lose" money as it would be locked for a long time.
+ /// Default is MAX_LOCAL_BREAKDOWN_TIMEOUT, which we also enforce as a maximum value
+ /// so you can tweak config to reduce the loss of having useless locked funds (if your peer accepts)
+ pub their_to_self_delay: u16
}
impl ChannelHandshakeLimits {
max_dust_limit_satoshis: <u64>::max_value(),
max_minimum_depth: 144,
force_announced_channel_preference: true,
+ their_to_self_delay: MAX_LOCAL_BREAKDOWN_TIMEOUT,
}
}
}