feat: Add evm feature gate

- Move all evm code inside evm directory
- StrategyEncoder:
  - Kept StrategyEncoder trait but created a new one: EVMStrategyEncoder to implement encode_protocol_header (that is evm specific).
  - All StrategyEncoders implement both traits now
  - Renamed DefaultStrategySelector -> EVMStrategySelector
- RouterEncoder:
  - Created a RouterEncoder trait and a EVMRouterEncoder that implements it
- Moved utils inside evm directory as well
- Renamed config.json -> executor_addresses.json and moved it to a higher config directory
- Make alloy optional and dependent on the evm feature gate

--- don't change below this line ---
ENG-4075 <#DTT#>

Cargo.toml

@@ -10,9 +10,9 @@ num-bigint = "0.4.6"
 
 tokio = { version = "1.38.0", features = ["full"] }
 
-alloy = { version = "0.5.4", features = ["providers"] }
-alloy-sol-types = { version = "0.8.14" }
-alloy-primitives = { version = "0.8.9" }
+alloy = { version = "0.5.4", features = ["providers"], optional = true }
+alloy-sol-types = { version = "0.8.14", optional = true }
+alloy-primitives = { version = "0.8.9", optional = true }
 tycho-core = { git = "https://github.com/propeller-heads/tycho-indexer.git", package = "tycho-core", tag = "0.46.0" }
 hex = "0.4.3"
 anyhow = "1.0.95"
@@ -20,5 +20,9 @@ num-traits = "0.2.19"
 serde = { version = "1.0.217", features = ["derive"] }
 serde_json = "1.0.135"
 
+[features]
+default = ["evm"]
+evm = ["alloy", "alloy-sol-types", "alloy-primitives"]
+
 [profile.bench]
 debug = true

src/encoding/approvals/mod.rs

@@ -1,3 +0,0 @@
-pub(crate) mod approvals_manager;
-pub(crate) mod interface;
-mod permit2;

src/encoding/evm/approvals/mod.rs

@@ -0,0 +1,2 @@
+pub mod permit2;
+pub mod protocol_approvals_manager;

src/encoding/evm/approvals/permit2.rs

@@ -3,7 +3,7 @@ use std::str::FromStr;
 use alloy_primitives::U256;
 use tycho_core::Bytes;
 
-use crate::encoding::approvals::interface::{Approval, UserApprovalsManager};
+use crate::encoding::user_approvals_manager::{Approval, UserApprovalsManager};
 
 #[allow(dead_code)]
 pub struct Permit2 {

src/encoding/evm/mod.rs

@@ -0,0 +1,5 @@
+pub mod approvals;
+mod router_encoder;
+mod strategy_encoder;
+mod swap_encoder;
+mod utils;

src/encoding/evm/router_encoder.rs

@@ -0,0 +1,81 @@
+use alloy_sol_types::SolValue;
+use anyhow::Error;
+use num_bigint::BigUint;
+
+use crate::encoding::{
+    evm::utils::{encode_input, ple_encode},
+    models::{NativeAction, Solution, Transaction, PROPELLER_ROUTER_ADDRESS},
+    router_encoder::RouterEncoder,
+    strategy_encoder::StrategySelector,
+    user_approvals_manager::{Approval, UserApprovalsManager},
+};
+
+#[allow(dead_code)]
+pub struct EVMRouterEncoder<S: StrategySelector, A: UserApprovalsManager> {
+    strategy_selector: S,
+    approvals_manager: A,
+}
+
+#[allow(dead_code)]
+impl<S: StrategySelector, A: UserApprovalsManager> EVMRouterEncoder<S, A> {
+    pub fn new(strategy_selector: S, approvals_manager: A) -> Self {
+        EVMRouterEncoder { strategy_selector, approvals_manager }
+    }
+}
+impl<S: StrategySelector, A: UserApprovalsManager> RouterEncoder<S, A> for EVMRouterEncoder<S, A> {
+    fn encode_router_calldata(&self, solutions: Vec<Solution>) -> Result<Transaction, Error> {
+        let _approvals_calldata = self.handle_approvals(&solutions)?; // TODO: where should we append this?
+        let mut calldata_list: Vec<Vec<u8>> = Vec::new();
+        let encode_for_batch_execute = solutions.len() > 1;
+        let mut value = BigUint::ZERO;
+        for solution in solutions.iter() {
+            let exact_out = solution.exact_out;
+            let straight_to_pool = solution.straight_to_pool;
+
+            let strategy = self
+                .strategy_selector
+                .select_strategy(solution);
+            let method_calldata = strategy.encode_strategy((*solution).clone())?;
+
+            let contract_interaction = if encode_for_batch_execute {
+                let args = (strategy.action_type(exact_out) as u16, method_calldata);
+                args.abi_encode()
+            } else if straight_to_pool {
+                method_calldata
+            } else {
+                encode_input(strategy.selector(exact_out), method_calldata)
+            };
+            calldata_list.push(contract_interaction);
+
+            if solution.native_action.clone().unwrap() == NativeAction::Wrap {
+                value += solution.given_amount.clone();
+            }
+        }
+        let data = if encode_for_batch_execute {
+            let args = (false, ple_encode(calldata_list));
+            encode_input("batchExecute(bytes)", args.abi_encode())
+        } else {
+            calldata_list[0].clone()
+        };
+
+        Ok(Transaction { data, value })
+    }
+
+    fn handle_approvals(&self, solutions: &[Solution]) -> Result<Vec<u8>, Error> {
+        let mut approvals = Vec::new();
+        for solution in solutions.iter() {
+            approvals.push(Approval {
+                token: solution.given_token.clone(),
+                spender: solution
+                    .router_address
+                    .clone()
+                    .unwrap_or(PROPELLER_ROUTER_ADDRESS.clone()),
+                amount: solution.given_amount.clone(),
+                owner: solution.sender.clone(),
+            });
+        }
+        Ok(self
+            .approvals_manager
+            .encode_approvals(approvals))
+    }
+}

src/encoding/evm/strategy_encoder/encoder.rs

@@ -0,0 +1,198 @@
+use std::{cmp::min, str::FromStr};
+
+use alloy_primitives::Address;
+use alloy_sol_types::SolValue;
+use anyhow::Error;
+use num_bigint::BigUint;
+use num_traits::Zero;
+
+use crate::encoding::{
+    evm::{
+        swap_encoder::SWAP_ENCODER_REGISTRY,
+        utils::{biguint_to_u256, ple_encode},
+    },
+    models::{ActionType, EncodingContext, NativeAction, Solution, PROPELLER_ROUTER_ADDRESS},
+    strategy_encoder::StrategyEncoder,
+};
+
+#[allow(dead_code)]
+pub trait EVMStrategyEncoder: StrategyEncoder {
+    fn encode_protocol_header(
+        &self,
+        protocol_data: Vec<u8>,
+        executor_address: Address,
+        // Token indices, split, and token inclusion are only used for split swaps
+        token_in: u16,
+        token_out: u16,
+        split: u16, // not sure what should be the type of this :/
+    ) -> Vec<u8> {
+        let args = (executor_address, token_in, token_out, split, protocol_data);
+        args.abi_encode()
+    }
+}
+
+pub struct SingleSwapStrategyEncoder {}
+impl EVMStrategyEncoder for SingleSwapStrategyEncoder {}
+
+impl StrategyEncoder for SingleSwapStrategyEncoder {
+    fn encode_strategy(&self, _solution: Solution) -> Result<Vec<u8>, Error> {
+        todo!()
+    }
+
+    fn action_type(&self, exact_out: bool) -> ActionType {
+        if exact_out {
+            ActionType::SingleExactOut
+        } else {
+            ActionType::SingleExactIn
+        }
+    }
+
+    fn selector(&self, exact_out: bool) -> &str {
+        if exact_out {
+            "singleExactOut(uint256, bytes)"
+        } else {
+            "singleExactIn(uint256, bytes)"
+        }
+    }
+}
+
+pub struct SequentialStrategyEncoder {}
+impl EVMStrategyEncoder for SequentialStrategyEncoder {}
+
+impl StrategyEncoder for SequentialStrategyEncoder {
+    fn encode_strategy(&self, solution: Solution) -> Result<Vec<u8>, Error> {
+        let check_amount = if solution.check_amount.is_some() {
+            let mut check_amount = solution.check_amount.clone().unwrap();
+            if solution.slippage.is_some() {
+                let one_hundred = BigUint::from(100u32);
+                let slippage_percent = BigUint::from((solution.slippage.unwrap() * 100.0) as u32);
+                let multiplier = &one_hundred - slippage_percent;
+                let expected_amount_with_slippage =
+                    (&solution.expected_amount * multiplier) / one_hundred;
+                check_amount = min(check_amount, expected_amount_with_slippage);
+            }
+            check_amount
+        } else {
+            BigUint::ZERO
+        };
+
+        let mut swaps = vec![];
+        for (index, swap) in solution.swaps.iter().enumerate() {
+            let is_last = index == solution.swaps.len() - 1;
+            let registry = SWAP_ENCODER_REGISTRY.read().unwrap();
+            let swap_encoder = registry
+                .get_encoder(&swap.component.protocol_system)
+                .expect("Swap encoder not found");
+            let router_address = if solution.router_address.is_some() {
+                solution.router_address.clone().unwrap()
+            } else {
+                PROPELLER_ROUTER_ADDRESS.clone()
+            };
+            let receiver = if is_last { solution.receiver.clone() } else { router_address.clone() };
+
+            let encoding_context = EncodingContext {
+                receiver,
+                exact_out: solution.exact_out,
+                address_for_approvals: router_address,
+            };
+            let protocol_data = swap_encoder.encode_swap(swap.clone(), encoding_context)?;
+            let executor_address = swap_encoder.executor_address();
+            let swap_data = self.encode_protocol_header(
+                protocol_data,
+                Address::from_str(executor_address).expect("Couldn't convert executor address"),
+                0,
+                0,
+                0,
+            );
+            swaps.push(swap_data);
+        }
+
+        let encoded_swaps = ple_encode(swaps);
+
+        let (mut unwrap, mut wrap) = (false, false);
+        if solution.native_action.is_some() {
+            match solution.native_action.unwrap() {
+                NativeAction::Wrap => wrap = true,
+                NativeAction::Unwrap => unwrap = true,
+            }
+        }
+        let method_calldata = (
+            wrap,
+            unwrap,
+            biguint_to_u256(&solution.given_amount),
+            !check_amount.is_zero(), /* if check_amount is zero, then we don't need to check */
+            biguint_to_u256(&check_amount),
+            encoded_swaps,
+        )
+            .abi_encode();
+        Ok(method_calldata)
+    }
+
+    fn action_type(&self, exact_out: bool) -> ActionType {
+        if exact_out {
+            ActionType::SequentialExactOut
+        } else {
+            ActionType::SequentialExactIn
+        }
+    }
+
+    fn selector(&self, exact_out: bool) -> &str {
+        if exact_out {
+            "sequentialExactOut(uint256, uint256, bytes[])"
+        } else {
+            "sequentialExactIn(uint256, uint256, bytes[])"
+        }
+    }
+}
+
+pub struct SplitSwapStrategyEncoder {}
+impl EVMStrategyEncoder for SplitSwapStrategyEncoder {}
+impl StrategyEncoder for SplitSwapStrategyEncoder {
+    fn encode_strategy(&self, _solution: Solution) -> Result<Vec<u8>, Error> {
+        todo!()
+    }
+    fn action_type(&self, _exact_out: bool) -> ActionType {
+        ActionType::SplitIn
+    }
+
+    fn selector(&self, _exact_out: bool) -> &str {
+        "splitExactIn(uint256, address, uint256, bytes[])"
+    }
+}
+
+/// 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>, Error> {
+        if solution.router_address.is_none() {
+            return Err(anyhow::anyhow!(
+                "Router address is required for straight to pool solutions"
+            ));
+        }
+        let swap = solution.swaps.first().unwrap();
+        let registry = SWAP_ENCODER_REGISTRY.read().unwrap();
+        let swap_encoder = registry
+            .get_encoder(&swap.component.protocol_system)
+            .expect("Swap encoder not found");
+        let router_address = solution.router_address.unwrap();
+
+        let encoding_context = EncodingContext {
+            receiver: solution.receiver,
+            exact_out: solution.exact_out,
+            address_for_approvals: 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)
+    }
+
+    fn action_type(&self, _exact_out: bool) -> ActionType {
+        unimplemented!();
+    }
+
+    fn selector(&self, _exact_out: bool) -> &str {
+        unimplemented!();
+    }
+}

src/encoding/evm/strategy_encoder/mod.rs

@@ -0,0 +1,2 @@
+mod encoder;
+mod selector;

src/encoding/evm/strategy_encoder/selector.rs

@@ -1,19 +1,15 @@
 use crate::encoding::{
-    models::Solution,
-    strategy_encoder::{
+    evm::strategy_encoder::encoder::{
         SequentialStrategyEncoder, SingleSwapStrategyEncoder, SplitSwapStrategyEncoder,
-        StraightToPoolStrategyEncoder, StrategyEncoder,
+        StraightToPoolStrategyEncoder,
     },
+    models::Solution,
+    strategy_encoder::{StrategyEncoder, StrategySelector},
 };
 
-pub trait StrategySelector {
-    #[allow(dead_code)]
-    fn select_strategy(&self, solution: &Solution) -> Box<dyn StrategyEncoder>;
-}
+pub struct EVMStrategySelector;
 
-pub struct DefaultStrategySelector;
-
-impl StrategySelector for DefaultStrategySelector {
+impl StrategySelector for EVMStrategySelector {
     fn select_strategy(&self, solution: &Solution) -> Box<dyn StrategyEncoder> {
         if solution.straight_to_pool {
             Box::new(StraightToPoolStrategyEncoder {})

src/encoding/evm/swap_encoder/builder.rs

@@ -1,5 +1,6 @@
-use crate::encoding::swap_encoder::swap_struct_encoder::{
-    BalancerV2SwapEncoder, SwapEncoder, UniswapV2SwapEncoder,
+use crate::encoding::{
+    evm::swap_encoder::encoders::{BalancerV2SwapEncoder, UniswapV2SwapEncoder},
+    swap_encoder::SwapEncoder,
 };
 
 pub struct SwapEncoderBuilder {

src/encoding/evm/swap_encoder/encoders.rs

@@ -5,19 +5,13 @@ use alloy_sol_types::SolValue;
 use anyhow::Error;
 
 use crate::encoding::{
-    approvals::approvals_manager::ProtocolApprovalsManager,
+    evm::{
+        approvals::protocol_approvals_manager::ProtocolApprovalsManager, utils::bytes_to_address,
+    },
     models::{EncodingContext, Swap},
-    utils::bytes_to_address,
+    swap_encoder::SwapEncoder,
 };
 
-pub trait SwapEncoder: Sync + Send {
-    fn new(executor_address: String) -> Self
-    where
-        Self: Sized;
-    fn encode_swap(&self, swap: Swap, encoding_context: EncodingContext) -> Result<Vec<u8>, Error>;
-    fn executor_address(&self) -> &str;
-}
-
 pub struct UniswapV2SwapEncoder {
     executor_address: String,
 }

src/encoding/evm/swap_encoder/mod.rs

@@ -1,17 +1,18 @@
+mod builder;
+mod encoders;
+mod registry;
+
 use std::sync::RwLock;
 
 use lazy_static::lazy_static;
 use tycho_core::dto::Chain;
 
-use crate::encoding::swap_encoder::registry::{Config, SwapEncoderRegistry};
-
-mod builder;
-mod registry;
-mod swap_struct_encoder;
+use crate::encoding::evm::swap_encoder::registry::{Config, SwapEncoderRegistry};
 
 lazy_static! {
     pub static ref SWAP_ENCODER_REGISTRY: RwLock<SwapEncoderRegistry> = {
-        let config = Config::from_file("config.json").expect("Failed to load configuration file");
+        let config = Config::from_file("src/encoding/config/executor_addresses.json")
+            .expect("Failed to load configuration file");
         RwLock::new(SwapEncoderRegistry::new(config, Chain::Ethereum))
     };
 }

src/encoding/evm/swap_encoder/registry.rs

@@ -3,9 +3,7 @@ use std::{collections::HashMap, fs};
 use serde::Deserialize;
 use tycho_core::dto::Chain;
 
-use crate::encoding::swap_encoder::{
-    builder::SwapEncoderBuilder, swap_struct_encoder::SwapEncoder,
-};
+use crate::encoding::{evm::swap_encoder::builder::SwapEncoderBuilder, swap_encoder::SwapEncoder};
 
 pub struct SwapEncoderRegistry {
     encoders: HashMap<String, Box<dyn SwapEncoder>>,
@@ -19,7 +17,7 @@ impl SwapEncoderRegistry {
             .get(&blockchain)
             .unwrap_or_else(|| panic!("No executors found for blockchain: {}", blockchain));
         for (protocol, executor_address) in executors {
-            let builder = SwapEncoderBuilder::new(&protocol, &executor_address);
+            let builder = SwapEncoderBuilder::new(protocol, executor_address);
             let encoder = builder.build().unwrap_or_else(|_| {
                 panic!("Failed to build swap encoder for protocol: {}", protocol)
             });

src/encoding/mod.rs

@@ -1,7 +1,7 @@
-mod approvals;
+#[cfg(feature = "evm")]
+mod evm;
 mod models;
 mod router_encoder;
 mod strategy_encoder;
-mod strategy_selector;
 mod swap_encoder;
-mod utils;
+mod user_approvals_manager;

src/encoding/models.rs

@@ -53,6 +53,7 @@ pub enum NativeAction {
 }
 
 #[derive(Clone)]
+#[allow(dead_code)]
 pub struct Swap {
     /// Protocol component from tycho indexer
     pub component: ProtocolComponent,
@@ -71,12 +72,14 @@ pub struct Transaction {
     pub value: BigUint,
 }
 
+#[allow(dead_code)]
 pub struct EncodingContext {
     pub receiver: Bytes,
     pub exact_out: bool,
     pub address_for_approvals: Bytes,
 }
 
+#[allow(dead_code)]
 pub enum ActionType {
     SingleExactIn = 1,
     SingleExactOut = 2,

src/encoding/router_encoder.rs

@@ -1,78 +1,13 @@
-use alloy_sol_types::SolValue;
 use anyhow::Error;
-use num_bigint::BigUint;
 
 use crate::encoding::{
-    approvals::interface::{Approval, UserApprovalsManager},
-    models::{NativeAction, Solution, Transaction, PROPELLER_ROUTER_ADDRESS},
-    strategy_selector::StrategySelector,
-    utils::{encode_input, ple_encode},
+    models::{Solution, Transaction},
+    strategy_encoder::StrategySelector,
+    user_approvals_manager::UserApprovalsManager,
 };
 
 #[allow(dead_code)]
-struct RouterEncoder<S: StrategySelector, A: UserApprovalsManager> {
-    strategy_selector: S,
-    approvals_manager: A,
-}
-
-#[allow(dead_code)]
-impl<S: StrategySelector, A: UserApprovalsManager> RouterEncoder<S, A> {
-    pub fn new(strategy_selector: S, approvals_manager: A) -> Self {
-        RouterEncoder { strategy_selector, approvals_manager }
-    }
-    pub fn encode_router_calldata(&self, solutions: Vec<Solution>) -> Result<Transaction, Error> {
-        let _approvals_calldata = self.handle_approvals(&solutions)?; // TODO: where should we append this?
-        let mut calldata_list: Vec<Vec<u8>> = Vec::new();
-        let encode_for_batch_execute = solutions.len() > 1;
-        let mut value = BigUint::ZERO;
-        for solution in solutions.iter() {
-            let exact_out = solution.exact_out;
-            let straight_to_pool = solution.straight_to_pool;
-
-            let strategy = self
-                .strategy_selector
-                .select_strategy(solution);
-            let method_calldata = strategy.encode_strategy((*solution).clone())?;
-
-            let contract_interaction = if encode_for_batch_execute {
-                let args = (strategy.action_type(exact_out) as u16, method_calldata);
-                args.abi_encode()
-            } else if straight_to_pool {
-                method_calldata
-            } else {
-                encode_input(strategy.selector(exact_out), method_calldata)
-            };
-            calldata_list.push(contract_interaction);
-
-            if solution.native_action.clone().unwrap() == NativeAction::Wrap {
-                value += solution.given_amount.clone();
-            }
-        }
-        let data = if encode_for_batch_execute {
-            let args = (false, ple_encode(calldata_list));
-            encode_input("batchExecute(bytes)", args.abi_encode())
-        } else {
-            calldata_list[0].clone()
-        };
-
-        Ok(Transaction { data, value })
-    }
-
-    fn handle_approvals(&self, solutions: &[Solution]) -> Result<Vec<u8>, Error> {
-        let mut approvals = Vec::new();
-        for solution in solutions.iter() {
-            approvals.push(Approval {
-                token: solution.given_token.clone(),
-                spender: solution
-                    .router_address
-                    .clone()
-                    .unwrap_or(PROPELLER_ROUTER_ADDRESS.clone()),
-                amount: solution.given_amount.clone(),
-                owner: solution.sender.clone(),
-            });
-        }
-        Ok(self
-            .approvals_manager
-            .encode_approvals(approvals))
-    }
+pub trait RouterEncoder<S: StrategySelector, A: UserApprovalsManager> {
+    fn encode_router_calldata(&self, solutions: Vec<Solution>) -> Result<Transaction, Error>;
+    fn handle_approvals(&self, solutions: &[Solution]) -> Result<Vec<u8>, Error>;
 }

src/encoding/strategy_encoder.rs

@@ -1,16 +1,6 @@
-use std::{cmp::min, str::FromStr};
-
-use alloy_primitives::Address;
-use alloy_sol_types::SolValue;
 use anyhow::Error;
-use num_bigint::BigUint;
-use num_traits::Zero;
 
-use crate::encoding::{
-    models::{ActionType, EncodingContext, NativeAction, Solution, PROPELLER_ROUTER_ADDRESS},
-    swap_encoder::SWAP_ENCODER_REGISTRY,
-    utils::{biguint_to_u256, ple_encode},
-};
+use crate::encoding::models::{ActionType, Solution};
 
 #[allow(dead_code)]
 pub trait StrategyEncoder {
@@ -18,181 +8,9 @@ pub trait StrategyEncoder {
 
     fn action_type(&self, exact_out: bool) -> ActionType;
     fn selector(&self, exact_out: bool) -> &str;
-
-    fn encode_protocol_header(
-        &self,
-        protocol_data: Vec<u8>,
-        executor_address: Address,
-        // Token indices, split, and token inclusion are only used for split swaps
-        token_in: u16,
-        token_out: u16,
-        split: u16, // not sure what should be the type of this :/
-    ) -> Vec<u8> {
-        let args = (executor_address, token_in, token_out, split, protocol_data);
-        args.abi_encode()
-    }
 }
 
-pub struct SingleSwapStrategyEncoder {}
-
-impl StrategyEncoder for SingleSwapStrategyEncoder {
-    fn encode_strategy(&self, _solution: Solution) -> Result<Vec<u8>, Error> {
-        todo!()
-    }
-
-    fn action_type(&self, exact_out: bool) -> ActionType {
-        if exact_out {
-            ActionType::SingleExactOut
-        } else {
-            ActionType::SingleExactIn
-        }
-    }
-
-    fn selector(&self, exact_out: bool) -> &str {
-        if exact_out {
-            "singleExactOut(uint256, bytes)"
-        } else {
-            "singleExactIn(uint256, bytes)"
-        }
-    }
-}
-
-pub struct SequentialStrategyEncoder {}
-
-impl StrategyEncoder for SequentialStrategyEncoder {
-    fn encode_strategy(&self, solution: Solution) -> Result<Vec<u8>, Error> {
-        let check_amount = if solution.check_amount.is_some() {
-            let mut check_amount = solution.check_amount.clone().unwrap();
-            if solution.slippage.is_some() {
-                let one_hundred = BigUint::from(100u32);
-                let slippage_percent = BigUint::from((solution.slippage.unwrap() * 100.0) as u32);
-                let multiplier = &one_hundred - slippage_percent;
-                let expected_amount_with_slippage =
-                    (&solution.expected_amount * multiplier) / one_hundred;
-                check_amount = min(check_amount, expected_amount_with_slippage);
-            }
-            check_amount
-        } else {
-            BigUint::ZERO
-        };
-
-        let mut swaps = vec![];
-        for (index, swap) in solution.swaps.iter().enumerate() {
-            let is_last = index == solution.swaps.len() - 1;
-            let registry = SWAP_ENCODER_REGISTRY.read().unwrap();
-            let swap_encoder = registry
-                .get_encoder(&swap.component.protocol_system)
-                .expect("Swap encoder not found");
-            let router_address = if solution.router_address.is_some() {
-                solution.router_address.clone().unwrap()
-            } else {
-                PROPELLER_ROUTER_ADDRESS.clone()
-            };
-            let receiver = if is_last { solution.receiver.clone() } else { router_address.clone() };
-
-            let encoding_context = EncodingContext {
-                receiver,
-                exact_out: solution.exact_out,
-                address_for_approvals: router_address,
-            };
-            let protocol_data = swap_encoder.encode_swap(swap.clone(), encoding_context)?;
-            let executor_address = swap_encoder.executor_address();
-            let swap_data = self.encode_protocol_header(
-                protocol_data,
-                Address::from_str(executor_address).expect("Couldn't convert executor address"),
-                0,
-                0,
-                0,
-            );
-            swaps.push(swap_data);
-        }
-
-        let encoded_swaps = ple_encode(swaps);
-
-        let (mut unwrap, mut wrap) = (false, false);
-        if solution.native_action.is_some() {
-            match solution.native_action.unwrap() {
-                NativeAction::Wrap => wrap = true,
-                NativeAction::Unwrap => unwrap = true,
-            }
-        }
-        let method_calldata = (
-            wrap,
-            unwrap,
-            biguint_to_u256(&solution.given_amount),
-            !check_amount.is_zero(), /* if check_amount is zero, then we don't need to check */
-            biguint_to_u256(&check_amount),
-            encoded_swaps,
-        )
-            .abi_encode();
-        Ok(method_calldata)
-    }
-
-    fn action_type(&self, exact_out: bool) -> ActionType {
-        if exact_out {
-            ActionType::SequentialExactOut
-        } else {
-            ActionType::SequentialExactIn
-        }
-    }
-
-    fn selector(&self, exact_out: bool) -> &str {
-        if exact_out {
-            "sequentialExactOut(uint256, uint256, bytes[])"
-        } else {
-            "sequentialExactIn(uint256, uint256, bytes[])"
-        }
-    }
-}
-
-pub struct SplitSwapStrategyEncoder {}
-
-impl StrategyEncoder for SplitSwapStrategyEncoder {
-    fn encode_strategy(&self, _solution: Solution) -> Result<Vec<u8>, Error> {
-        todo!()
-    }
-    fn action_type(&self, _exact_out: bool) -> ActionType {
-        ActionType::SplitIn
-    }
-
-    fn selector(&self, _exact_out: bool) -> &str {
-        "splitExactIn(uint256, address, uint256, bytes[])"
-    }
-}
-
-/// 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 StrategyEncoder for StraightToPoolStrategyEncoder {
-    fn encode_strategy(&self, solution: Solution) -> Result<Vec<u8>, Error> {
-        if solution.router_address.is_none() {
-            return Err(anyhow::anyhow!(
-                "Router address is required for straight to pool solutions"
-            ));
-        }
-        let swap = solution.swaps.first().unwrap();
-        let registry = SWAP_ENCODER_REGISTRY.read().unwrap();
-        let swap_encoder = registry
-            .get_encoder(&swap.component.protocol_system)
-            .expect("Swap encoder not found");
-        let router_address = solution.router_address.unwrap();
-
-        let encoding_context = EncodingContext {
-            receiver: solution.receiver,
-            exact_out: solution.exact_out,
-            address_for_approvals: 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)
-    }
-
-    fn action_type(&self, _exact_out: bool) -> ActionType {
-        unimplemented!();
-    }
-
-    fn selector(&self, _exact_out: bool) -> &str {
-        unimplemented!();
-    }
+pub trait StrategySelector {
+    #[allow(dead_code)]
+    fn select_strategy(&self, solution: &Solution) -> Box<dyn StrategyEncoder>;
 }

src/encoding/swap_encoder.rs

@@ -0,0 +1,12 @@
+use anyhow::Error;
+
+use crate::encoding::models::{EncodingContext, Swap};
+
+#[allow(dead_code)]
+pub trait SwapEncoder: Sync + Send {
+    fn new(executor_address: String) -> Self
+    where
+        Self: Sized;
+    fn encode_swap(&self, swap: Swap, encoding_context: EncodingContext) -> Result<Vec<u8>, Error>;
+    fn executor_address(&self) -> &str;
+}