feat: UniswapX encoding example

examples/uniswapx-encoding-example/README.md

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+# UniswapX Encoding Example
+
+This guide enables you to:
+
+1. Create a Solution object
+2. Create callback data for executing a UniswapX Order
+
+## How to run
+
+```bash
+cargo run --release --example uniswapx-encoding-example
+```

examples/uniswapx-encoding-example/main.rs

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+use std::{collections::HashMap, str::FromStr};
+
+use alloy::{
+    hex::encode,
+    primitives::{Address, Keccak256},
+    sol_types::SolValue,
+};
+use num_bigint::{BigInt, BigUint};
+use tycho_common::{models::protocol::ProtocolComponent, Bytes};
+use tycho_execution::encoding::{
+    evm::{
+        approvals::protocol_approvals_manager::ProtocolApprovalsManager,
+        encoder_builders::TychoRouterEncoderBuilder,
+        utils::{biguint_to_u256, bytes_to_address},
+    },
+    models::{Solution, Swap, UserTransferType},
+};
+
+/// Encodes the input data for a function call to the given function selector.
+pub fn encode_input(selector: &str, mut encoded_args: Vec<u8>) -> Vec<u8> {
+    let mut hasher = Keccak256::new();
+    hasher.update(selector.as_bytes());
+    let selector_bytes = &hasher.finalize()[..4];
+    let mut call_data = selector_bytes.to_vec();
+    // Remove extra prefix if present (32 bytes for dynamic data)
+    // Alloy encoding is including a prefix for dynamic data indicating the offset or length
+    // but at this point we don't want that
+    if encoded_args.len() > 32 &&
+        encoded_args[..32] ==
+            [0u8; 31]
+                .into_iter()
+                .chain([32].to_vec())
+                .collect::<Vec<u8>>()
+    {
+        encoded_args = encoded_args[32..].to_vec();
+    }
+    call_data.extend(encoded_args);
+    call_data
+}
+
+fn main() {
+    let router_address = Bytes::from_str("0xfD0b31d2E955fA55e3fa641Fe90e08b677188d35")
+        .expect("Failed to create router address");
+
+    // Initialize the encoder
+    let encoder = TychoRouterEncoderBuilder::new()
+        .chain(tycho_common::models::Chain::Ethereum)
+        .user_transfer_type(UserTransferType::TransferFrom)
+        .executors_file_path("config/test_executor_addresses.json".to_string())
+        .router_address(router_address.clone())
+        .build()
+        .expect("Failed to build encoder");
+
+    // Set up UniswapX-related variables
+    let filler = Bytes::from_str("0x6D9da78B6A5BEdcA287AA5d49613bA36b90c15C4").unwrap();
+    let usx_reactor = Address::from_str("0x00000011F84B9aa48e5f8aA8B9897600006289Be").unwrap();
+
+    // ------------------- Encode a sequential swap -------------------
+    // Prepare data to encode. We will encode a sequential swap from DAI to USDT though USDC using
+    // USV3 pools
+    //
+    //   DAI ───(USV3)──> USDC ───(USV2)──> USDT
+    //
+    // First we need to create  swap objects
+
+    let dai = Bytes::from_str("0x6b175474e89094c44da98b954eedeac495271d0f").unwrap();
+    let usdc = Bytes::from_str("0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48").unwrap();
+    let usdt = Bytes::from_str("0xdAC17F958D2ee523a2206206994597C13D831ec7").unwrap();
+
+    let swap_dai_usdc = Swap {
+        component: ProtocolComponent {
+            id: "0x5777d92f208679DB4b9778590Fa3CAB3aC9e2168".to_string(),
+            protocol_system: "uniswap_v3".to_string(),
+            static_attributes: {
+                let mut attrs = HashMap::new();
+                attrs
+                    .insert("fee".to_string(), Bytes::from(BigInt::from(100).to_signed_bytes_be()));
+                attrs
+            },
+            ..Default::default()
+        },
+        token_in: dai.clone(),
+        token_out: usdc.clone(),
+        split: 0f64,
+        user_data: None,
+    };
+    let swap_usdc_usdt = Swap {
+        component: ProtocolComponent {
+            id: "0x3416cF6C708Da44DB2624D63ea0AAef7113527C6".to_string(),
+            protocol_system: "uniswap_v3".to_string(),
+            static_attributes: {
+                let mut attrs = HashMap::new();
+                attrs
+                    .insert("fee".to_string(), Bytes::from(BigInt::from(100).to_signed_bytes_be()));
+                attrs
+            },
+            ..Default::default()
+        },
+        token_in: usdc.clone(),
+        token_out: usdt.clone(),
+        split: 0f64,
+        user_data: None,
+    };
+
+    // Then we create a solution object with the previous swap
+    let solution = Solution {
+        exact_out: false,
+        given_token: dai.clone(),
+        given_amount: BigUint::from_str("2_000_000000000000000000").unwrap(),
+        checked_token: usdt.clone(),
+        checked_amount: BigUint::from_str("1_990_000000").unwrap(),
+        sender: filler.clone(),
+        receiver: filler.clone(),
+        swaps: vec![swap_dai_usdc, swap_usdc_usdt],
+        ..Default::default()
+    };
+
+    // Encode the solution using appropriate safety checks
+    let encoded_solution = encoder
+        .encode_solutions(vec![solution.clone()])
+        .unwrap()[0]
+        .clone();
+
+    let given_amount = biguint_to_u256(&solution.given_amount);
+    let min_amount_out = biguint_to_u256(&solution.checked_amount);
+    let given_token = bytes_to_address(&solution.given_token).unwrap();
+    let checked_token = bytes_to_address(&solution.checked_token).unwrap();
+    let receiver = bytes_to_address(&solution.receiver).unwrap();
+
+    let method_calldata = (
+        given_amount,
+        given_token,
+        checked_token,
+        min_amount_out,
+        false, // wrap
+        false, // unwrap
+        receiver,
+        true, // transferFrom permitted
+        encoded_solution.swaps,
+    )
+        .abi_encode();
+
+    let tycho_calldata = encode_input(&encoded_solution.function_signature, method_calldata);
+
+    // Uniswap X specific part (check necessary approvals)
+    let filler_address = bytes_to_address(&filler).unwrap();
+    let token_approvals_manager = ProtocolApprovalsManager::new().unwrap();
+
+    let token_in_approval_needed = token_approvals_manager
+        .approval_needed(
+            bytes_to_address(&dai).unwrap(),
+            filler_address,
+            bytes_to_address(&router_address).unwrap(),
+        )
+        .unwrap();
+
+    let token_out_approval_needed = token_approvals_manager
+        .approval_needed(bytes_to_address(&usdc).unwrap(), filler_address, usx_reactor)
+        .unwrap();
+
+    let full_calldata =
+        (token_in_approval_needed, token_out_approval_needed, tycho_calldata).abi_encode_packed();
+
+    let hex_calldata = encode(&full_calldata);
+
+    println!(" ====== Simple swap WETH -> USDC ======");
+    println!(
+        "The following callback data should be sent to the filler contract, along with the \
+        encoded order and signature: {:?}",
+        hex_calldata
+    );
+}