feat: Add EncodingError

Change method signatures to expect it and raise it where it makes sense

--- don't change below this line ---
ENG-4076 <#DTT#>

src/encoding/errors.rs

@@ -0,0 +1,31 @@
+use std::io;
+
+use thiserror::Error;
+
+/// Represents the outer-level, user-facing errors of the tycho-execution encoding package.
+///
+/// `EncodingError` encompasses all possible errors that can occur in the package,
+/// wrapping lower-level errors in a user-friendly way for easier handling and display.
+/// Variants:
+/// - `InvalidInput`: Indicates that the encoding has failed due to bad input parameters.
+/// - `FatalError`: There is problem with the application setup.
+#[derive(Error, Debug)]
+#[allow(dead_code)]
+pub enum EncodingError {
+    #[error("Invalid input: {0}")]
+    InvalidInput(String),
+    #[error("Fatal error: {0}")]
+    FatalError(String),
+}
+
+impl From<io::Error> for EncodingError {
+    fn from(err: io::Error) -> Self {
+        EncodingError::FatalError(err.to_string())
+    }
+}
+
+impl From<serde_json::Error> for EncodingError {
+    fn from(err: serde_json::Error) -> Self {
+        EncodingError::FatalError(err.to_string())
+    }
+}

src/encoding/evm/router_encoder.rs

@@ -1,7 +1,8 @@
-use anyhow::Error;
+use alloy_sol_types::SolValue;
 use num_bigint::BigUint;
 
 use crate::encoding::{
+    errors::EncodingError,
     evm::utils::encode_input,
     models::{NativeAction, Solution, Transaction, PROPELLER_ROUTER_ADDRESS},
     router_encoder::RouterEncoder,
@@ -22,7 +23,10 @@ impl<S: StrategySelector, A: UserApprovalsManager> EVMRouterEncoder<S, A> {
     }
 }
 impl<S: StrategySelector, A: UserApprovalsManager> RouterEncoder<S, A> for EVMRouterEncoder<S, A> {
-    fn encode_router_calldata(&self, solutions: Vec<Solution>) -> Result<Vec<Transaction>, Error> {
+    fn encode_router_calldata(
+        &self,
+        solutions: Vec<Solution>,
+    ) -> Result<Vec<Transaction>, EncodingError> {
         let _approvals_calldata = self.handle_approvals(&solutions)?; // TODO: where should we append this?
         let mut transactions: Vec<Transaction> = Vec::new();
         for solution in solutions.iter() {
@@ -50,7 +54,7 @@ impl<S: StrategySelector, A: UserApprovalsManager> RouterEncoder<S, A> for EVMRo
         Ok(transactions)
     }
 
-    fn handle_approvals(&self, solutions: &[Solution]) -> Result<Vec<Vec<u8>>, Error> {
+    fn handle_approvals(&self, solutions: &[Solution]) -> Result<Vec<Vec<u8>>, EncodingError> {
         let mut approvals = Vec::new();
         for solution in solutions.iter() {
             approvals.push(Approval {

src/encoding/evm/strategy_encoder/encoder.rs

@@ -1,8 +1,10 @@
 use alloy_primitives::Address;
 use alloy_sol_types::SolValue;
-use anyhow::Error;
+use num_bigint::BigUint;
+use num_traits::Zero;
 
 use crate::encoding::{
+    errors::EncodingError,
     evm::swap_encoder::SWAP_ENCODER_REGISTRY,
     models::{EncodingContext, Solution},
     strategy_encoder::StrategyEncoder,
@@ -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>, Error> {
+    fn encode_strategy(&self, _solution: Solution) -> Result<Vec<u8>, EncodingError> {
         todo!()
     }
     fn selector(&self, _exact_out: bool) -> &str {
@@ -40,17 +42,26 @@ impl StrategyEncoder for SplitSwapStrategyEncoder {
 pub struct StraightToPoolStrategyEncoder {}
 impl EVMStrategyEncoder for StraightToPoolStrategyEncoder {}
 impl StrategyEncoder for StraightToPoolStrategyEncoder {
-    fn encode_strategy(&self, solution: Solution) -> Result<Vec<u8>, Error> {
+    fn encode_strategy(&self, solution: Solution) -> Result<Vec<u8>, EncodingError> {
         if solution.router_address.is_none() {
-            return Err(anyhow::anyhow!(
-                "Router address is required for straight to pool solutions"
+            return Err(EncodingError::InvalidInput(
+                "Router address is required for straight to pool solutions".to_string(),
             ));
         }
         let swap = solution.swaps.first().unwrap();
-        let registry = SWAP_ENCODER_REGISTRY.read().unwrap();
+        let registry = SWAP_ENCODER_REGISTRY
+            .read()
+            .map_err(|_| {
+                EncodingError::FatalError("Failed to read the swap encoder registry".to_string())
+            })?;
         let swap_encoder = registry
             .get_encoder(&swap.component.protocol_system)
-            .expect("Swap encoder not found");
+            .ok_or_else(|| {
+                EncodingError::InvalidInput(format!(
+                    "Swap encoder not found for protocol: {}",
+                    swap.component.protocol_system
+                ))
+            })?;
         let router_address = solution.router_address.unwrap();
 
         let encoding_context = EncodingContext {

src/encoding/evm/swap_encoder/encoders.rs

@@ -2,9 +2,9 @@ use std::str::FromStr;
 
 use alloy_primitives::Address;
 use alloy_sol_types::SolValue;
-use anyhow::Error;
 
 use crate::encoding::{
+    errors::EncodingError,
     evm::{
         approvals::protocol_approvals_manager::ProtocolApprovalsManager, utils::bytes_to_address,
     },
@@ -25,7 +25,7 @@ impl SwapEncoder for UniswapV2SwapEncoder {
         &self,
         _swap: Swap,
         _encoding_context: EncodingContext,
-    ) -> Result<Vec<u8>, Error> {
+    ) -> Result<Vec<u8>, EncodingError> {
         todo!()
     }
 
@@ -47,7 +47,11 @@ impl SwapEncoder for BalancerV2SwapEncoder {
                 .expect("Invalid string for balancer vault address"),
         }
     }
-    fn encode_swap(&self, swap: Swap, encoding_context: EncodingContext) -> Result<Vec<u8>, Error> {
+    fn encode_swap(
+        &self,
+        swap: Swap,
+        encoding_context: EncodingContext,
+    ) -> Result<Vec<u8>, EncodingError> {
         let token_approvals_manager = ProtocolApprovalsManager::new();
         let runtime = tokio::runtime::Handle::try_current()
             .is_err()

src/encoding/evm/swap_encoder/registry.rs

@@ -3,7 +3,10 @@ use std::{collections::HashMap, fs};
 use serde::Deserialize;
 use tycho_core::dto::Chain;
 
-use crate::encoding::{evm::swap_encoder::builder::SwapEncoderBuilder, swap_encoder::SwapEncoder};
+use crate::encoding::{
+    errors::EncodingError, evm::swap_encoder::builder::SwapEncoderBuilder,
+    swap_encoder::SwapEncoder,
+};
 
 pub struct SwapEncoderRegistry {
     encoders: HashMap<String, Box<dyn SwapEncoder>>,
@@ -40,7 +43,7 @@ pub struct Config {
 }
 
 impl Config {
-    pub fn from_file(path: &str) -> Result<Self, anyhow::Error> {
+    pub fn from_file(path: &str) -> Result<Self, EncodingError> {
         let config_str = fs::read_to_string(path)?;
         let config: Config = serde_json::from_str(&config_str)?;
         Ok(config)

src/encoding/evm/utils.rs

@@ -1,18 +1,19 @@
 use alloy_primitives::{Address, Keccak256, U256};
 use alloy_sol_types::SolValue;
-use anyhow::Error;
 use num_bigint::BigUint;
 use tycho_core::Bytes;
 
+use crate::encoding::errors::EncodingError;
+
 /// Safely converts a `Bytes` object to an `Address` object.
 ///
-/// Checks the length of the `Bytes` before attempting to convert, and returns a `SimulationError`
+/// Checks the length of the `Bytes` before attempting to convert, and returns an `EncodingError`
 /// if not 20 bytes long.
-pub fn bytes_to_address(address: &Bytes) -> Result<Address, Error> {
+pub fn bytes_to_address(address: &Bytes) -> Result<Address, EncodingError> {
     if address.len() == 20 {
         Ok(Address::from_slice(address))
     } else {
-        Err(anyhow::format_err!("Invalid ERC20 token address: {:?}", address))
+        Err(EncodingError::InvalidInput(format!("Invalid ERC20 token address: {:?}", address)))
     }
 }
 

src/encoding/mod.rs

@@ -1,3 +1,4 @@
+mod errors;
 #[cfg(feature = "evm")]
 mod evm;
 mod models;

src/encoding/router_encoder.rs

@@ -1,6 +1,5 @@
-use anyhow::Error;
-
 use crate::encoding::{
+    errors::EncodingError,
     models::{Solution, Transaction},
     strategy_encoder::StrategySelector,
     user_approvals_manager::UserApprovalsManager,
@@ -8,6 +7,9 @@ use crate::encoding::{
 
 #[allow(dead_code)]
 pub trait RouterEncoder<S: StrategySelector, A: UserApprovalsManager> {
-    fn encode_router_calldata(&self, solutions: Vec<Solution>) -> Result<Vec<Transaction>, Error>;
-    fn handle_approvals(&self, solutions: &[Solution]) -> Result<Vec<Vec<u8>>, Error>;
+    fn encode_router_calldata(
+        &self,
+        solutions: Vec<Solution>,
+    ) -> Result<Vec<Transaction>, EncodingError>;
+    fn handle_approvals(&self, solutions: &[Solution]) -> Result<Vec<Vec<u8>>, EncodingError>;
 }

src/encoding/strategy_encoder.rs

@@ -1,10 +1,11 @@
-use anyhow::Error;
-
-use crate::encoding::models::Solution;
+use crate::encoding::{
+    errors::EncodingError,
+    models::{ActionType, Solution},
+};
 
 #[allow(dead_code)]
 pub trait StrategyEncoder {
-    fn encode_strategy(&self, to_encode: Solution) -> Result<Vec<u8>, Error>;
+    fn encode_strategy(&self, to_encode: Solution) -> Result<Vec<u8>, EncodingError>;
     fn selector(&self, exact_out: bool) -> &str;
 }
 

src/encoding/swap_encoder.rs

@@ -1,12 +1,17 @@
-use anyhow::Error;
-
-use crate::encoding::models::{EncodingContext, Swap};
+use crate::encoding::{
+    errors::EncodingError,
+    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 encode_swap(
+        &self,
+        swap: Swap,
+        encoding_context: EncodingContext,
+    ) -> Result<Vec<u8>, EncodingError>;
     fn executor_address(&self) -> &str;
 }