feat: add broadcast_minimum to Client

examples/wallet.rs

@@ -63,6 +63,7 @@ async fn main() -> anyhow::Result<()> {
             tracing::info!("Local chain tip: {}", wallet.local_chain().tip().height());
             let next = wallet.peek_address(KeychainKind::External, last_revealed + 1);
             tracing::info!("Next receiving address: {next}");
+            tracing::info!("Broadcast minimum fee rate: {}", client.broadcast_minimum());
         }
     }
 }

src/lib.rs

@@ -160,6 +160,7 @@ use core::fmt;
 use std::collections::BTreeMap;
 
 use bdk_chain::{
+    bitcoin::FeeRate,
     keychain_txout::KeychainTxOutIndex,
     local_chain::{self, CheckPoint, LocalChain},
     spk_client::FullScanResult,
@@ -195,6 +196,8 @@ pub struct Client<K> {
     chain: local_chain::LocalChain,
     // receive graph
     graph: IndexedTxGraph<ConfirmationBlockTime, KeychainTxOutIndex<K>>,
+    // the network minimum to broadcast a transaction
+    min_broadcast_fee: FeeRate,
 }
 
 impl<K> Client<K>
@@ -213,6 +216,7 @@ where
             receiver,
             chain: LocalChain::from_tip(cp)?,
             graph: IndexedTxGraph::new(index.clone()),
+            min_broadcast_fee: FeeRate::BROADCAST_MIN,
         })
     }
 
@@ -256,6 +260,11 @@ where
                     });
                     break;
                 }
+                NodeMessage::FeeFilter(fee_filter) => {
+                    if self.min_broadcast_fee < fee_filter {
+                        self.min_broadcast_fee = fee_filter;
+                    }
+                }
                 _ => (),
             }
         }
@@ -377,6 +386,11 @@ where
                 NodeMessage::TxBroadcastFailure(failure_payload) => {
                     return Some(Event::TxFailed(failure_payload));
                 }
+                NodeMessage::FeeFilter(fee_filter) => {
+                    if self.min_broadcast_fee < fee_filter {
+                        self.min_broadcast_fee = fee_filter;
+                    }
+                }
                 _ => continue,
             }
         }
@@ -397,6 +411,11 @@ where
             .await
     }
 
+    /// The minimum fee required for a transaction to propagate to the connected peers.
+    pub fn broadcast_minimum(&self) -> FeeRate {
+        self.min_broadcast_fee
+    }
+
     /// Add more scripts to the node. For example, a user may reveal a Bitcoin address to receive a
     /// payment, so this script should be added to the [`Node`].
     ///