feat: add mixed mining mode

crates/anvil/src/cmd.rs

@@ -98,6 +98,9 @@ pub struct NodeArgs {
     #[arg(long, visible_alias = "no-mine", conflicts_with = "block_time")]
     pub no_mining: bool,
 
+    #[arg(long, visible_alias = "mixed-mining", requires = "block_time")]
+    pub mixed_mining: bool,
+
     /// The hosts the server will listen on.
     #[arg(
         long,
@@ -200,6 +203,7 @@ impl NodeArgs {
             .with_hardfork(self.hardfork)
             .with_blocktime(self.block_time)
             .with_no_mining(self.no_mining)
+            .with_mixed_mining(self.mixed_mining, self.block_time)
             .with_account_generator(self.account_generator())
             .with_genesis_balance(genesis_balance)
             .with_genesis_timestamp(self.timestamp)

crates/anvil/src/config.rs

@@ -113,6 +113,8 @@ pub struct NodeConfig {
     pub block_time: Option<Duration>,
     /// Disable auto, interval mining mode uns use `MiningMode::None` instead
     pub no_mining: bool,
+    /// Enables auto and interval mining mode
+    pub mixed_mining: bool,
     /// port to use for the server
     pub port: u16,
     /// maximum number of transactions in a block
@@ -395,6 +397,7 @@ impl Default for NodeConfig {
             genesis_balance: Unit::ETHER.wei().saturating_mul(U256::from(100u64)),
             block_time: None,
             no_mining: false,
+            mixed_mining: false,
             port: NODE_PORT,
             // TODO make this something dependent on block capacity
             max_transactions: 1_000,
@@ -633,6 +636,17 @@ impl NodeConfig {
         self
     }
 
+    #[must_use]
+    pub fn with_mixed_mining<D: Into<Duration>>(
+        mut self,
+        mixed_mining: bool,
+        block_time: Option<D>,
+    ) -> Self {
+        self.block_time = block_time.map(Into::into);
+        self.mixed_mining = mixed_mining;
+        self
+    }
+
     /// If set to `true` auto mining will be disabled
     #[must_use]
     pub fn with_no_mining(mut self, no_mining: bool) -> Self {

crates/anvil/src/eth/miner.rs

@@ -132,6 +132,9 @@ pub enum MiningMode {
     Auto(ReadyTransactionMiner),
     /// A miner that constructs a new block every `interval` tick
     FixedBlockTime(FixedBlockTimeMiner),
+
+    /// A minner that uses both Auto and FixedBlockTime
+    Mixed(ReadyTransactionMiner, FixedBlockTimeMiner),
 }
 
 impl MiningMode {
@@ -147,6 +150,13 @@ impl MiningMode {
         Self::FixedBlockTime(FixedBlockTimeMiner::new(duration))
     }
 
+    pub fn mixed(max_transactions: usize, listener: Receiver<TxHash>, duration: Duration) -> Self {
+        Self::Mixed(
+            ReadyTransactionMiner { max_transactions, has_pending_txs: None, rx: listener.fuse() },
+            FixedBlockTimeMiner::new(duration),
+        )
+    }
+
     /// polls the [Pool] and returns those transactions that should be put in a block, if any.
     pub fn poll(
         &mut self,
@@ -157,6 +167,29 @@ impl MiningMode {
             Self::None => Poll::Pending,
             Self::Auto(miner) => miner.poll(pool, cx),
             Self::FixedBlockTime(miner) => miner.poll(pool, cx),
+            Self::Mixed(auto, fixed) => {
+                let auto_txs = auto.poll(pool, cx);
+                let fixed_txs = fixed.poll(pool, cx);
+
+                match (auto_txs, fixed_txs) {
+                    // Both auto and fixed transactions are ready, combine them
+                    (Poll::Ready(mut auto_txs), Poll::Ready(fixed_txs)) => {
+                        for tx in fixed_txs {
+                            // filter unique transactions
+                            if auto_txs.iter().any(|auto_tx| auto_tx.hash() == tx.hash()) {
+                                continue;
+                            }
+                            auto_txs.push(tx);
+                        }
+                        Poll::Ready(auto_txs)
+                    }
+                    // Only auto transactions are ready, return them
+                    (Poll::Ready(auto_txs), Poll::Pending) => Poll::Ready(auto_txs),
+                    // Only fixed transactions are ready or both are pending,
+                    // return fixed transactions or pending status
+                    (Poll::Pending, fixed_txs) => fixed_txs,
+                }
+            }
         }
     }
 }

crates/anvil/src/lib.rs

@@ -142,13 +142,19 @@ pub async fn try_spawn(mut config: NodeConfig) -> io::Result<(EthApi, NodeHandle
         no_mining,
         transaction_order,
         genesis,
+        mixed_mining,
         ..
     } = config.clone();
 
     let pool = Arc::new(Pool::default());
 
     let mode = if let Some(block_time) = block_time {
-        MiningMode::interval(block_time)
+        if mixed_mining {
+            let listener = pool.add_ready_listener();
+            MiningMode::mixed(max_transactions, listener, block_time)
+        } else {
+            MiningMode::interval(block_time)
+        }
     } else if no_mining {
         MiningMode::None
     } else {