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Expose min_funding_satoshis via Config #844

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Expose min_funding_satoshis via Config #844

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0aad750
fix: expose min_funding_satoshis via Config
vincenzopalazzo Mar 25, 2026
59ef00a
fix: use LDK default for min_funding_satoshis instead of hardcoded co…
vincenzopalazzo Mar 27, 2026
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34 changes: 32 additions & 2 deletions src/config.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,8 @@ use lightning::ln::msgs::SocketAddress;
use lightning::routing::gossip::NodeAlias;
use lightning::routing::router::RouteParametersConfig;
use lightning::util::config::{
ChannelConfig as LdkChannelConfig, MaxDustHTLCExposure as LdkMaxDustHTLCExposure, UserConfig,
ChannelConfig as LdkChannelConfig, ChannelHandshakeLimits,
MaxDustHTLCExposure as LdkMaxDustHTLCExposure, UserConfig,
};

use crate::logger::LogLevel;
Expand Down Expand Up @@ -125,6 +126,7 @@ pub(crate) const LNURL_AUTH_TIMEOUT_SECS: u64 = 15;
/// | `node_alias` | None |
/// | `trusted_peers_0conf` | [] |
/// | `probing_liquidity_limit_multiplier` | 3 |
/// | `min_funding_sats` | LDK default |
/// | `anchor_channels_config` | Some(..) |
/// | `route_parameters` | None |
/// | `tor_config` | None |
Expand Down Expand Up @@ -167,6 +169,16 @@ pub struct Config {
/// Channels with available liquidity less than the required amount times this value won't be
/// used to send pre-flight probes.
pub probing_liquidity_limit_multiplier: u64,
/// The minimum funding amount in satoshis that we require from channel counterparties when
/// they open inbound channels to us.
///
/// Channels with funding below this value will be rejected.
///
/// Defaults to the `rust-lightning` value of
/// [`ChannelHandshakeLimits::min_funding_satoshis`].
///
/// [`ChannelHandshakeLimits::min_funding_satoshis`]: lightning::util::config::ChannelHandshakeLimits::min_funding_satoshis
pub min_funding_sats: u64,
/// Configuration options pertaining to Anchor channels, i.e., channels for which the
/// `option_anchors_zero_fee_htlc_tx` channel type is negotiated.
///
Expand Down Expand Up @@ -210,6 +222,7 @@ impl Default for Config {
announcement_addresses: None,
trusted_peers_0conf: Vec::new(),
probing_liquidity_limit_multiplier: DEFAULT_PROBING_LIQUIDITY_LIMIT_MULTIPLIER,
min_funding_sats: ChannelHandshakeLimits::default().min_funding_satoshis,
anchor_channels_config: Some(AnchorChannelsConfig::default()),
tor_config: None,
route_parameters: None,
Expand Down Expand Up @@ -339,6 +352,7 @@ pub(crate) fn default_user_config(config: &Config) -> UserConfig {
// will mostly be relevant for inbound channels.
let mut user_config = UserConfig::default();
user_config.channel_handshake_limits.force_announced_channel_preference = false;
user_config.channel_handshake_limits.min_funding_satoshis = config.min_funding_sats;
user_config.channel_handshake_config.negotiate_anchors_zero_fee_htlc_tx =
config.anchor_channels_config.is_some();
user_config.reject_inbound_splices = false;
Expand Down Expand Up @@ -637,7 +651,9 @@ pub enum AsyncPaymentsRole {
mod tests {
use std::str::FromStr;

use super::{may_announce_channel, AnnounceError, Config, NodeAlias, SocketAddress};
use super::{
default_user_config, may_announce_channel, AnnounceError, Config, NodeAlias, SocketAddress,
};

#[test]
fn node_announce_channel() {
Expand Down Expand Up @@ -684,4 +700,18 @@ mod tests {
}
assert!(may_announce_channel(&node_config).is_ok());
}

#[test]
fn min_funding_sats_configures_user_config() {
let mut node_config = Config::default();
let user_config = default_user_config(&node_config);
assert_eq!(
user_config.channel_handshake_limits.min_funding_satoshis,
node_config.min_funding_sats
);

node_config.min_funding_sats = 42_000;
let user_config = default_user_config(&node_config);
assert_eq!(user_config.channel_handshake_limits.min_funding_satoshis, 42_000);
}
}
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