Add helper trait (#14394)

Co-authored-by: Matthias Seitz <matthias.seitz@outlook.de>

crates/optimism/txpool/src/conditional.rs

@@ -0,0 +1,18 @@
+//! Additional support for pooled transactions with [`TransactionConditional`]
+
+use alloy_rpc_types_eth::erc4337::TransactionConditional;
+
+/// Helper trait that allows attaching a [`TransactionConditional`].
+pub trait MaybeConditionalTransaction {
+    /// Attach a [`TransactionConditional`].
+    fn set_conditional(&mut self, conditional: TransactionConditional);
+
+    /// Helper that sets the conditional and returns the instance again
+    fn with_conditional(mut self, conditional: TransactionConditional) -> Self
+    where
+        Self: Sized,
+    {
+        self.set_conditional(conditional);
+        self
+    }
+}

crates/optimism/txpool/src/lib.rs

@@ -13,6 +13,7 @@
 mod validator;
 pub use validator::{OpL1BlockInfo, OpTransactionValidator};
 
+pub mod conditional;
 mod transaction;
 pub use transaction::OpPooledTransaction;
 

crates/optimism/txpool/src/transaction.rs

@@ -1,3 +1,4 @@
+use crate::conditional::MaybeConditionalTransaction;
 use alloy_consensus::{
     transaction::Recovered, BlobTransactionSidecar, BlobTransactionValidationError, Typed2718,
 };
@@ -66,6 +67,12 @@ impl<Cons: SignedTransaction, Pooled> OpPooledTransaction<Cons, Pooled> {
     }
 }
 
+impl<Cons, Pooled> MaybeConditionalTransaction for OpPooledTransaction<Cons, Pooled> {
+    fn set_conditional(&mut self, conditional: TransactionConditional) {
+        self.conditional = Some(Box::new(conditional))
+    }
+}
+
 impl<Cons, Pooled> PoolTransaction for OpPooledTransaction<Cons, Pooled>
 where
     Cons: SignedTransaction + From<Pooled>,