feat: update ExecutorEncoder interface and relevant types

src/encoding/evm/router_encoder.rs

@@ -30,7 +30,7 @@ impl<S: StrategySelector, A: UserApprovalsManager> RouterEncoder<S, A> for EVMRo
         &self,
         solutions: Vec<Solution>,
     ) -> Result<Vec<Transaction>, EncodingError> {
-        let _approvals_calldata = self.handle_approvals(&solutions)?; // TODO: where should we append this?
+        let _approvals_calldata = self.handle_approvals(&solutions)?;
         let mut transactions: Vec<Transaction> = Vec::new();
         for solution in solutions.iter() {
             let exact_out = solution.exact_out;
@@ -39,7 +39,8 @@ impl<S: StrategySelector, A: UserApprovalsManager> RouterEncoder<S, A> for EVMRo
             let strategy = self
                 .strategy_selector
                 .select_strategy(solution);
-            let method_calldata = strategy.encode_strategy((*solution).clone())?;
+            let (method_calldata, target_address) =
+                strategy.encode_strategy((*solution).clone())?;
 
             let contract_interaction = if straight_to_pool {
                 method_calldata
@@ -52,7 +53,11 @@ impl<S: StrategySelector, A: UserApprovalsManager> RouterEncoder<S, A> for EVMRo
             } else {
                 BigUint::ZERO
             };
-            transactions.push(Transaction { value, data: contract_interaction });
+            transactions.push(Transaction {
+                value,
+                data: contract_interaction,
+                to: target_address,
+            });
         }
         Ok(transactions)
     }

src/encoding/evm/strategy_encoder/encoder.rs

@@ -1,3 +1,5 @@
+use std::str::FromStr;
+
 use alloy_primitives::Address;
 use alloy_sol_types::SolValue;
 
@@ -27,7 +29,7 @@ pub trait EVMStrategyEncoder: StrategyEncoder {
 pub struct SplitSwapStrategyEncoder {}
 impl EVMStrategyEncoder for SplitSwapStrategyEncoder {}
 impl StrategyEncoder for SplitSwapStrategyEncoder {
-    fn encode_strategy(&self, _solution: Solution) -> Result<Vec<u8>, EncodingError> {
+    fn encode_strategy(&self, _solution: Solution) -> Result<(Vec<u8>, Address), EncodingError> {
         todo!()
     }
     fn selector(&self, _exact_out: bool) -> &str {
@@ -37,10 +39,10 @@ impl StrategyEncoder for SplitSwapStrategyEncoder {
 
 /// This strategy encoder is used for solutions that are sent directly to the pool.
 /// Only 1 solution with 1 swap is supported.
-pub struct StraightToPoolStrategyEncoder {}
-impl EVMStrategyEncoder for StraightToPoolStrategyEncoder {}
-impl StrategyEncoder for StraightToPoolStrategyEncoder {
-    fn encode_strategy(&self, solution: Solution) -> Result<Vec<u8>, EncodingError> {
+pub struct ExecutorEncoder {}
+impl EVMStrategyEncoder for ExecutorEncoder {}
+impl StrategyEncoder for ExecutorEncoder {
+    fn encode_strategy(&self, solution: Solution) -> Result<(Vec<u8>, Address), EncodingError> {
         if solution.router_address.is_none() {
             return Err(EncodingError::InvalidInput(
                 "Router address is required for straight to pool solutions".to_string(),
@@ -68,10 +70,11 @@ impl StrategyEncoder for StraightToPoolStrategyEncoder {
             router_address,
         };
         let protocol_data = swap_encoder.encode_swap(swap.clone(), encoding_context)?;
-        // TODO: here we need to pass also the address of the executor to be used
-        Ok(protocol_data)
+        let executor_address = Address::from_str(swap_encoder.executor_address())
+            .map_err(|_| EncodingError::FatalError("Invalid executor address".to_string()))?;
+        Ok((protocol_data, executor_address))
     }
     fn selector(&self, _exact_out: bool) -> &str {
-        unimplemented!();
+        "swap(uint256, bytes)"
     }
 }

src/encoding/evm/strategy_encoder/selector.rs

@@ -1,5 +1,5 @@
 use crate::encoding::{
-    evm::strategy_encoder::encoder::{SplitSwapStrategyEncoder, StraightToPoolStrategyEncoder},
+    evm::strategy_encoder::encoder::{ExecutorEncoder, SplitSwapStrategyEncoder},
     models::Solution,
     strategy_encoder::{StrategyEncoder, StrategySelector},
 };
@@ -9,7 +9,7 @@ pub struct EVMStrategySelector;
 impl StrategySelector for EVMStrategySelector {
     fn select_strategy(&self, solution: &Solution) -> Box<dyn StrategyEncoder> {
         if solution.straight_to_pool {
-            Box::new(StraightToPoolStrategyEncoder {})
+            Box::new(ExecutorEncoder {})
         } else {
             Box::new(SplitSwapStrategyEncoder {})
         }

src/encoding/models.rs

@@ -1,3 +1,4 @@
+use alloy_primitives::Address;
 use num_bigint::BigUint;
 use tycho_core::{dto::ProtocolComponent, Bytes};
 
@@ -60,6 +61,8 @@ pub struct Transaction {
     pub data: Vec<u8>,
     // ETH value to be sent with the transaction.
     pub value: BigUint,
+    // Address of the contract to call with the calldata
+    pub to: Address,
 }
 
 #[allow(dead_code)]

src/encoding/strategy_encoder.rs

@@ -1,8 +1,10 @@
+use alloy_primitives::Address;
+
 use crate::encoding::{errors::EncodingError, models::Solution};
 
 #[allow(dead_code)]
 pub trait StrategyEncoder {
-    fn encode_strategy(&self, to_encode: Solution) -> Result<Vec<u8>, EncodingError>;
+    fn encode_strategy(&self, to_encode: Solution) -> Result<(Vec<u8>, Address), EncodingError>;
     fn selector(&self, exact_out: bool) -> &str;
 }