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Merge pull request #16 from G8XSU/update-fees
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Original file line number | Diff line number | Diff line change |
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use ldk_node::bitcoin::secp256k1::PublicKey; | ||
use ldk_node::config::{ChannelConfig, MaxDustHTLCExposure}; | ||
use ldk_node::{Node, UserChannelId}; | ||
use protos::channel_config::MaxDustHtlcExposure; | ||
use protos::{UpdateChannelConfigRequest, UpdateChannelConfigResponse}; | ||
use std::str::FromStr; | ||
use std::sync::Arc; | ||
|
||
pub(crate) const UPDATE_CHANNEL_CONFIG_PATH: &str = "UpdateChannelConfig"; | ||
|
||
pub(crate) fn handle_update_channel_config_request( | ||
node: Arc<Node>, request: UpdateChannelConfigRequest, | ||
) -> Result<UpdateChannelConfigResponse, ldk_node::NodeError> { | ||
let user_channel_id: u128 = | ||
request.user_channel_id.parse().map_err(|_| ldk_node::NodeError::InvalidChannelId)?; | ||
|
||
//FIXME: Use ldk/ldk-node's partial config update api. | ||
let current_config = node | ||
.list_channels() | ||
.into_iter() | ||
.find(|c| c.user_channel_id.0 == user_channel_id) | ||
.ok_or_else(|| ldk_node::NodeError::InvalidChannelId)? | ||
.config; | ||
|
||
let updated_channel_config = | ||
build_updated_channel_config(current_config, request.channel_config.unwrap()); | ||
|
||
let counterparty_node_id = PublicKey::from_str(&request.counterparty_node_id) | ||
.map_err(|_| ldk_node::NodeError::InvalidPublicKey)?; | ||
node.update_channel_config( | ||
&UserChannelId(user_channel_id), | ||
counterparty_node_id, | ||
updated_channel_config, | ||
) | ||
.map_err(ldk_node::NodeError::from)?; | ||
|
||
Ok(UpdateChannelConfigResponse {}) | ||
} | ||
|
||
fn build_updated_channel_config( | ||
current_config: ChannelConfig, proto_channel_config: protos::ChannelConfig, | ||
) -> ChannelConfig { | ||
let max_dust_htlc_exposure = proto_channel_config | ||
.max_dust_htlc_exposure | ||
.map(|max_dust_htlc_exposure| match max_dust_htlc_exposure { | ||
MaxDustHtlcExposure::FixedLimitMsat(limit_msat) => { | ||
MaxDustHTLCExposure::FixedLimit { limit_msat } | ||
}, | ||
MaxDustHtlcExposure::FeeRateMultiplier(multiplier) => { | ||
MaxDustHTLCExposure::FeeRateMultiplier { multiplier } | ||
}, | ||
}) | ||
.unwrap_or(current_config.max_dust_htlc_exposure); | ||
|
||
let cltv_expiry_delta = proto_channel_config | ||
.cltv_expiry_delta.map(|c| u16::try_from(c).unwrap()) | ||
.unwrap_or(current_config.cltv_expiry_delta); | ||
|
||
ChannelConfig { | ||
forwarding_fee_proportional_millionths: proto_channel_config | ||
.forwarding_fee_proportional_millionths | ||
.unwrap_or(current_config.forwarding_fee_proportional_millionths), | ||
forwarding_fee_base_msat: proto_channel_config | ||
.forwarding_fee_base_msat | ||
.unwrap_or(current_config.forwarding_fee_base_msat), | ||
cltv_expiry_delta, | ||
max_dust_htlc_exposure, | ||
force_close_avoidance_max_fee_satoshis: proto_channel_config | ||
.force_close_avoidance_max_fee_satoshis | ||
.unwrap_or(current_config.force_close_avoidance_max_fee_satoshis), | ||
accept_underpaying_htlcs: proto_channel_config | ||
.accept_underpaying_htlcs | ||
.unwrap_or(current_config.accept_underpaying_htlcs), | ||
} | ||
} |
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