feat(payload): add transaction_count to ExecutionPayload trait (#20534)

crates/payload/primitives/src/payload.rs

@@ -55,6 +55,9 @@ pub trait ExecutionPayload:
 
     /// Returns the total gas consumed by all transactions in this block.
     fn gas_used(&self) -> u64;
+
+    /// Returns the number of transactions in the payload.
+    fn transaction_count(&self) -> usize;
 }
 
 impl ExecutionPayload for ExecutionData {
@@ -89,6 +92,10 @@ impl ExecutionPayload for ExecutionData {
     fn gas_used(&self) -> u64 {
         self.payload.as_v1().gas_used
     }
+
+    fn transaction_count(&self) -> usize {
+        self.payload.as_v1().transactions.len()
+    }
 }
 
 /// A unified type for handling both execution payloads and payload attributes.
@@ -196,6 +203,10 @@ impl ExecutionPayload for op_alloy_rpc_types_engine::OpExecutionData {
     fn gas_used(&self) -> u64 {
         self.payload.as_v1().gas_used
     }
+
+    fn transaction_count(&self) -> usize {
+        self.payload.as_v1().transactions.len()
+    }
 }
 
 /// Extended functionality for Ethereum execution payloads

examples/custom-node/src/engine.rs

@@ -70,6 +70,10 @@ impl ExecutionPayload for CustomExecutionData {
     fn gas_used(&self) -> u64 {
         self.inner.gas_used()
     }
+
+    fn transaction_count(&self) -> usize {
+        self.inner.payload.as_v1().transactions.len()
+    }
 }
 
 impl TryFrom<&reth_optimism_flashblocks::FlashBlockCompleteSequence> for CustomExecutionData {