feat: add tx propagation mode

crates/net/network/src/transactions/config.rs

@@ -18,13 +18,41 @@ pub struct TransactionsManagerConfig {
     pub transaction_fetcher_config: TransactionFetcherConfig,
     /// Max number of seen transactions to store for each peer.
     pub max_transactions_seen_by_peer_history: u32,
+    /// How new pending transactions are propagated.
+    #[cfg_attr(feature = "serde", serde(default))]
+    pub propagation_mode: TransactionPropagationMode,
 }
 
 impl Default for TransactionsManagerConfig {
     fn default() -> Self {
         Self {
             transaction_fetcher_config: TransactionFetcherConfig::default(),
             max_transactions_seen_by_peer_history: DEFAULT_MAX_COUNT_TRANSACTIONS_SEEN_BY_PEER,
+            propagation_mode: TransactionPropagationMode::default(),
+        }
+    }
+}
+
+/// Determines how new pending transactions are propagated to other peers in full.
+#[derive(Debug, Clone, Default)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+pub enum TransactionPropagationMode {
+    /// Send full transactions to sqrt of current peers.
+    #[default]
+    Sqrt,
+    /// Always send transactions in full.
+    All,
+    /// Send full transactions to a maximum number of peers
+    Max(usize),
+}
+
+impl TransactionPropagationMode {
+    /// Returns the number of peers that should
+    pub(crate) fn full_peer_count(&self, peer_count: usize) -> usize {
+        match self {
+            Self::Sqrt => (peer_count as f64).sqrt().round() as usize,
+            Self::All => peer_count,
+            Self::Max(max) => peer_count.min(*max),
         }
     }
 }

crates/net/network/src/transactions/mod.rs

@@ -12,7 +12,7 @@ pub use self::constants::{
     tx_fetcher::DEFAULT_SOFT_LIMIT_BYTE_SIZE_POOLED_TRANSACTIONS_RESP_ON_PACK_GET_POOLED_TRANSACTIONS_REQ,
     SOFT_LIMIT_BYTE_SIZE_POOLED_TRANSACTIONS_RESPONSE,
 };
-pub use config::{TransactionFetcherConfig, TransactionsManagerConfig};
+pub use config::{TransactionFetcherConfig, TransactionPropagationMode, TransactionsManagerConfig};
 pub use validation::*;
 
 pub(crate) use fetcher::{FetchEvent, TransactionFetcher};
@@ -246,8 +246,8 @@ pub struct TransactionsManager<Pool> {
     pending_transactions: ReceiverStream<TxHash>,
     /// Incoming events from the [`NetworkManager`](crate::NetworkManager).
     transaction_events: UnboundedMeteredReceiver<NetworkTransactionEvent>,
-    /// Max number of seen transactions to store for each peer.
-    max_transactions_seen_by_peer_history: u32,
+    /// How the `TransactionsManager` is configured.
+    config: TransactionsManagerConfig,
     /// `TransactionsManager` metrics
     metrics: TransactionsManagerMetrics,
 }
@@ -298,8 +298,7 @@ impl<Pool: TransactionPool> TransactionsManager<Pool> {
                 from_network,
                 NETWORK_POOL_TRANSACTIONS_SCOPE,
             ),
-            max_transactions_seen_by_peer_history: transactions_manager_config
-                .max_transactions_seen_by_peer_history,
+            config: transactions_manager_config,
             metrics,
         }
     }
@@ -424,9 +423,8 @@ where
             return propagated
         }
 
-        // send full transactions to a fraction of the connected peers (square root of the total
-        // number of connected peers)
-        let max_num_full = (self.peers.len() as f64).sqrt().round() as usize;
+        // send full transactions to a set of the connected peers based on the configured mode
+        let max_num_full = self.config.propagation_mode.full_peer_count(self.peers.len());
 
         // Note: Assuming ~random~ order due to random state of the peers map hasher
         for (peer_idx, (peer_id, peer)) in self.peers.iter_mut().enumerate() {
@@ -913,7 +911,7 @@ where
                     messages,
                     version,
                     client_version,
-                    self.max_transactions_seen_by_peer_history,
+                    self.config.max_transactions_seen_by_peer_history,
                 );
                 let peer = match self.peers.entry(peer_id) {
                     Entry::Occupied(mut entry) => {

crates/node/core/src/args/network.rs

@@ -226,6 +226,7 @@ impl NetworkArgs {
                 self.max_capacity_cache_txns_pending_fetch,
             ),
             max_transactions_seen_by_peer_history: self.max_seen_tx_history,
+            propagation_mode: Default::default(),
         };
 
         // Configure basic network stack