1208 lines
48 KiB
Rust
1208 lines
48 KiB
Rust
use std::{
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cmp::max,
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collections::{HashMap, HashSet, VecDeque},
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str::FromStr,
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};
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use alloy_primitives::{aliases::U24, FixedBytes, U256, U8};
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use alloy_sol_types::SolValue;
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use num_bigint::BigUint;
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use tycho_core::{dto::Chain, keccak256, Bytes};
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use crate::encoding::{
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errors::EncodingError,
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evm::{
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approvals::permit2::Permit2,
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constants::{NATIVE_ADDRESS, WETH_ADDRESS},
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swap_encoder::swap_encoder_registry::SwapEncoderRegistry,
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utils::{biguint_to_u256, bytes_to_address, encode_input, percentage_to_uint24},
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},
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models::{EncodingContext, NativeAction, Solution, Swap},
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strategy_encoder::StrategyEncoder,
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swap_encoder::SwapEncoder,
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};
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/// Encodes a solution using a specific strategy for execution on the EVM-compatible network.
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pub trait EVMStrategyEncoder: StrategyEncoder {
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/// Encodes information necessary for performing a single swap against a given executor for
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/// a protocol.
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fn encode_swap_header(
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&self,
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token_in: U8,
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token_out: U8,
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split: U24,
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executor_address: Bytes,
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executor_selector: FixedBytes<4>,
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protocol_data: Vec<u8>,
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) -> Vec<u8> {
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let mut encoded = Vec::new();
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encoded.push(token_in.to_be_bytes_vec()[0]);
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encoded.push(token_out.to_be_bytes_vec()[0]);
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encoded.extend_from_slice(&split.to_be_bytes_vec());
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encoded.extend(executor_address.to_vec());
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encoded.extend(executor_selector);
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encoded.extend(protocol_data);
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encoded
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}
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/// Encodes a selector string into its 4-byte representation.
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fn encode_executor_selector(&self, selector: &str) -> FixedBytes<4> {
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let hash = keccak256(selector.as_bytes());
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FixedBytes::<4>::from([hash[0], hash[1], hash[2], hash[3]])
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}
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/// Uses prefix-length encoding to efficient encode action data.
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///
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/// Prefix-length encoding is a data encoding method where the beginning of a data segment
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/// (the "prefix") contains information about the length of the following data.
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fn ple_encode(&self, action_data_array: Vec<Vec<u8>>) -> Vec<u8> {
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let mut encoded_action_data: Vec<u8> = Vec::new();
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for action_data in action_data_array {
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let args = (encoded_action_data, action_data.len() as u16, action_data);
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encoded_action_data = args.abi_encode_packed();
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}
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encoded_action_data
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}
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}
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/// Represents the encoder for a swap strategy which supports single, sequential and split swaps.
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///
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/// # Fields
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/// * `swap_encoder_registry`: SwapEncoderRegistry, containing all possible swap encoders
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/// * `permit2`: Permit2, responsible for managing permit2 operations and providing necessary
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/// signatures and permit2 objects for calling the router
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/// * `selector`: String, the selector for the swap function in the router contract
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pub struct SplitSwapStrategyEncoder {
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swap_encoder_registry: SwapEncoderRegistry,
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permit2: Permit2,
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selector: String,
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}
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impl SplitSwapStrategyEncoder {
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pub fn new(
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signer_pk: String,
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chain: Chain,
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swap_encoder_registry: SwapEncoderRegistry,
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) -> Result<Self, EncodingError> {
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let selector = "swap(uint256,address,address,uint256,bool,bool,uint256,address,((address,uint160,uint48,uint48),address,uint256),bytes,bytes)".to_string();
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Ok(Self { permit2: Permit2::new(signer_pk, chain)?, selector, swap_encoder_registry })
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}
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/// Raises an error if the split percentages are invalid.
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///
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/// Split percentages are considered valid if all the following conditions are met:
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/// * Each split amount is < 1 (100%)
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/// * There is exactly one 0% split for each token, and it's the last swap specified, signifying
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/// to the router to send the remainder of the token to the designated protocol
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/// * The sum of all non-remainder splits for each token is < 1 (100%)
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/// * There are no negative split amounts
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fn validate_split_percentages(&self, swaps: &[Swap]) -> Result<(), EncodingError> {
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let mut swaps_by_token: HashMap<Bytes, Vec<&Swap>> = HashMap::new();
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for swap in swaps {
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if swap.split >= 1.0 {
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return Err(EncodingError::InvalidInput(format!(
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"Split percentage must be less than 1 (100%), got {}",
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swap.split
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)));
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}
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swaps_by_token
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.entry(swap.token_in.clone())
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.or_default()
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.push(swap);
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}
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for (token, token_swaps) in swaps_by_token {
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// Single swaps don't need remainder handling
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if token_swaps.len() == 1 {
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if token_swaps[0].split != 0.0 {
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return Err(EncodingError::InvalidInput(format!(
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"Single swap must have 0% split for token {:?}",
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token
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)));
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}
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continue;
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}
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let mut found_zero_split = false;
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let mut total_percentage = 0.0;
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for (i, swap) in token_swaps.iter().enumerate() {
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match (swap.split == 0.0, i == token_swaps.len() - 1) {
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(true, false) => {
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return Err(EncodingError::InvalidInput(format!(
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"The 0% split for token {:?} must be the last swap",
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token
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)))
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}
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(true, true) => found_zero_split = true,
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(false, _) => {
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if swap.split < 0.0 {
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return Err(EncodingError::InvalidInput(format!(
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"All splits must be >= 0% for token {:?}",
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token
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)));
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}
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total_percentage += swap.split;
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}
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}
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}
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if !found_zero_split {
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return Err(EncodingError::InvalidInput(format!(
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"Token {:?} must have exactly one 0% split for remainder handling",
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token
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)));
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}
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// Total must be <100% to leave room for remainder
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if total_percentage >= 1.0 {
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return Err(EncodingError::InvalidInput(format!(
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"Total of non-remainder splits for token {:?} must be <100%, got {}%",
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token,
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total_percentage * 100.0
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)));
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}
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}
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Ok(())
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}
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/// Raises an error if swaps do not represent a valid path from the given token to the checked
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/// token.
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///
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/// A path is considered valid if all the following conditions are met:
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/// * The checked token is reachable from the given token through the swap path
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/// * There are no tokens which are unconnected from the main path
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fn validate_swap_path(
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&self,
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swaps: &[Swap],
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given_token: &Bytes,
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checked_token: &Bytes,
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native_action: &Option<NativeAction>,
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) -> Result<(), EncodingError> {
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// Convert ETH to WETH only if there's a corresponding wrap/unwrap action
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let given_token = if *given_token == *NATIVE_ADDRESS {
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match native_action {
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Some(NativeAction::Wrap) => &WETH_ADDRESS,
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_ => given_token,
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}
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} else {
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given_token
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};
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let checked_token = if *checked_token == *NATIVE_ADDRESS {
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match native_action {
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Some(NativeAction::Unwrap) => &WETH_ADDRESS,
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_ => checked_token,
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}
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} else {
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checked_token
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};
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// Build directed graph of token flows
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let mut graph: HashMap<&Bytes, HashSet<&Bytes>> = HashMap::new();
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for swap in swaps {
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graph
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.entry(&swap.token_in)
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.or_default()
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.insert(&swap.token_out);
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}
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// BFS from validation_given
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let mut visited = HashSet::new();
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let mut queue = VecDeque::new();
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queue.push_back(given_token);
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while let Some(token) = queue.pop_front() {
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if !visited.insert(token) {
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continue;
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}
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// Early success check
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if token == checked_token && visited.len() == graph.len() + 1 {
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return Ok(());
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}
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if let Some(next_tokens) = graph.get(token) {
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for &next_token in next_tokens {
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if !visited.contains(next_token) {
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queue.push_back(next_token);
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}
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}
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}
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}
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// If we get here, either checked_token wasn't reached or not all tokens were visited
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if !visited.contains(checked_token) {
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Err(EncodingError::InvalidInput(
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"Checked token is not reachable through swap path".to_string(),
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))
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} else {
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Err(EncodingError::InvalidInput(
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"Some tokens are not connected to the main path".to_string(),
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))
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}
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}
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}
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impl EVMStrategyEncoder for SplitSwapStrategyEncoder {}
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impl StrategyEncoder for SplitSwapStrategyEncoder {
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fn encode_strategy(
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&self,
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solution: Solution,
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router_address: Bytes,
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) -> Result<(Vec<u8>, Bytes), EncodingError> {
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self.validate_split_percentages(&solution.swaps)?;
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self.validate_swap_path(
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&solution.swaps,
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&solution.given_token,
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&solution.checked_token,
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&solution.native_action,
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)?;
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let (permit, signature) = self.permit2.get_permit(
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&router_address,
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&solution.sender,
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&solution.given_token,
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&solution.given_amount,
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)?;
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let mut min_amount_out = solution
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.check_amount
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.unwrap_or(BigUint::ZERO);
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if let (Some(expected_amount), Some(slippage)) =
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(solution.expected_amount.as_ref(), solution.slippage)
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{
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let one_hundred = BigUint::from(100u32);
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let slippage_percent = BigUint::from((slippage * 100.0) as u32);
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let multiplier = &one_hundred - slippage_percent;
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let expected_amount_with_slippage = (expected_amount * &multiplier) / &one_hundred;
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min_amount_out = max(min_amount_out, expected_amount_with_slippage);
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}
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// The tokens array is composed of the given token, the checked token and all the
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// intermediary tokens in between. The contract expects the tokens to be in this order.
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let solution_tokens: HashSet<Bytes> =
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vec![solution.given_token.clone(), solution.checked_token.clone()]
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.into_iter()
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.collect();
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let intermediary_tokens: HashSet<Bytes> = solution
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.swaps
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.iter()
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.flat_map(|swap| vec![swap.token_in.clone(), swap.token_out.clone()])
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.collect();
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let mut intermediary_tokens: Vec<Bytes> = intermediary_tokens
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.difference(&solution_tokens)
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.cloned()
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.collect();
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// this is only to make the test deterministic (same index for the same token for different
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// runs)
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intermediary_tokens.sort();
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let (mut unwrap, mut wrap) = (false, false);
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if let Some(action) = solution.native_action.clone() {
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match action {
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NativeAction::Wrap => wrap = true,
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NativeAction::Unwrap => unwrap = true,
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}
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}
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let mut tokens = Vec::with_capacity(2 + intermediary_tokens.len());
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if wrap {
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tokens.push(WETH_ADDRESS.clone());
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} else {
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tokens.push(solution.given_token.clone());
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}
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tokens.extend(intermediary_tokens);
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if unwrap {
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tokens.push(WETH_ADDRESS.clone());
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} else {
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tokens.push(solution.checked_token.clone());
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}
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let mut swaps = vec![];
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for swap in solution.swaps.iter() {
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let swap_encoder = self
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.get_swap_encoder(&swap.component.protocol_system)
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.ok_or_else(|| {
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EncodingError::InvalidInput(format!(
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"Swap encoder not found for protocol: {}",
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swap.component.protocol_system
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))
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})?;
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let encoding_context = EncodingContext {
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receiver: router_address.clone(),
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exact_out: solution.exact_out,
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router_address: router_address.clone(),
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};
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let protocol_data = swap_encoder.encode_swap(swap.clone(), encoding_context)?;
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let swap_data = self.encode_swap_header(
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U8::from(
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tokens
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.iter()
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.position(|t| *t == swap.token_in)
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.ok_or_else(|| {
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EncodingError::InvalidInput(
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"In token not found in tokens array".to_string(),
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)
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})?,
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),
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U8::from(
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tokens
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.iter()
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.position(|t| *t == swap.token_out)
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.ok_or_else(|| {
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EncodingError::InvalidInput(
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"Out token not found in tokens array".to_string(),
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)
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})?,
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),
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percentage_to_uint24(swap.split),
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Bytes::from_str(swap_encoder.executor_address()).map_err(|_| {
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EncodingError::FatalError("Invalid executor address".to_string())
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})?,
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self.encode_executor_selector(swap_encoder.executor_selector()),
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protocol_data,
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);
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swaps.push(swap_data);
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}
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let encoded_swaps = self.ple_encode(swaps);
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let method_calldata = (
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biguint_to_u256(&solution.given_amount),
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bytes_to_address(&solution.given_token)?,
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bytes_to_address(&solution.checked_token)?,
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biguint_to_u256(&min_amount_out),
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wrap,
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unwrap,
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U256::from(tokens.len()),
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bytes_to_address(&solution.receiver)?,
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permit,
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signature.as_bytes().to_vec(),
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encoded_swaps,
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)
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.abi_encode();
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let contract_interaction = encode_input(&self.selector, method_calldata);
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Ok((contract_interaction, router_address))
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}
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fn get_swap_encoder(&self, protocol_system: &str) -> Option<&Box<dyn SwapEncoder>> {
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self.swap_encoder_registry
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.get_encoder(protocol_system)
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}
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}
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|
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/// This strategy encoder is used for solutions that are sent directly to the executor, bypassing
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/// the router. Only one solution with one swap is supported.
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///
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/// # Fields
|
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/// * `swap_encoder_registry`: SwapEncoderRegistry, containing all possible swap encoders
|
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pub struct ExecutorStrategyEncoder {
|
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swap_encoder_registry: SwapEncoderRegistry,
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}
|
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|
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impl ExecutorStrategyEncoder {
|
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pub fn new(swap_encoder_registry: SwapEncoderRegistry) -> Self {
|
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Self { swap_encoder_registry }
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}
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}
|
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impl EVMStrategyEncoder for ExecutorStrategyEncoder {}
|
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impl StrategyEncoder for ExecutorStrategyEncoder {
|
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fn encode_strategy(
|
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&self,
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solution: Solution,
|
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_router_address: Bytes,
|
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) -> Result<(Vec<u8>, Bytes), EncodingError> {
|
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let router_address = solution.router_address.ok_or_else(|| {
|
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EncodingError::InvalidInput(
|
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"Router address is required for straight-to-executor solutions".to_string(),
|
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)
|
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})?;
|
|
|
|
let swap = solution
|
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.swaps
|
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.first()
|
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.ok_or_else(|| EncodingError::InvalidInput("No swaps found in solution".to_string()))?;
|
|
|
|
let swap_encoder = self
|
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.get_swap_encoder(&swap.component.protocol_system)
|
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.ok_or_else(|| {
|
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EncodingError::InvalidInput(format!(
|
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"Swap encoder not found for protocol: {}",
|
|
swap.component.protocol_system
|
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))
|
|
})?;
|
|
|
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let encoding_context = EncodingContext {
|
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receiver: solution.receiver,
|
|
exact_out: solution.exact_out,
|
|
router_address,
|
|
};
|
|
let protocol_data = swap_encoder.encode_swap(swap.clone(), encoding_context)?;
|
|
|
|
let executor_address = Bytes::from_str(swap_encoder.executor_address())
|
|
.map_err(|_| EncodingError::FatalError("Invalid executor address".to_string()))?;
|
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Ok((protocol_data, executor_address))
|
|
}
|
|
fn get_swap_encoder(&self, protocol_system: &str) -> Option<&Box<dyn SwapEncoder>> {
|
|
self.swap_encoder_registry
|
|
.get_encoder(protocol_system)
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use std::str::FromStr;
|
|
|
|
use alloy::hex::encode;
|
|
use num_bigint::BigUint;
|
|
use rstest::rstest;
|
|
use tycho_core::{dto::ProtocolComponent, Bytes};
|
|
|
|
use super::*;
|
|
use crate::encoding::{
|
|
evm::constants::{NATIVE_ADDRESS, WETH_ADDRESS},
|
|
models::Swap,
|
|
};
|
|
|
|
fn get_swap_encoder_registry() -> SwapEncoderRegistry {
|
|
SwapEncoderRegistry::new("src/encoding/config/executor_addresses.json", Chain::Ethereum)
|
|
.unwrap()
|
|
}
|
|
|
|
#[test]
|
|
fn test_executor_strategy_encode() {
|
|
let swap_encoder_registry = get_swap_encoder_registry();
|
|
let encoder = ExecutorStrategyEncoder::new(swap_encoder_registry);
|
|
|
|
let token_in = Bytes::from("0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2");
|
|
let token_out = Bytes::from("0x6b175474e89094c44da98b954eedeac495271d0f");
|
|
|
|
let swap = Swap {
|
|
component: ProtocolComponent {
|
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id: "0xA478c2975Ab1Ea89e8196811F51A7B7Ade33eB11".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: token_in.clone(),
|
|
token_out: token_out.clone(),
|
|
split: 0f64,
|
|
};
|
|
|
|
let solution = Solution {
|
|
exact_out: false,
|
|
given_token: token_in,
|
|
given_amount: BigUint::from(1000000000000000000u64),
|
|
expected_amount: Some(BigUint::from(1000000000000000000u64)),
|
|
checked_token: token_out,
|
|
check_amount: None,
|
|
sender: Bytes::from_str("0x0000000000000000000000000000000000000000").unwrap(),
|
|
// The receiver was generated with `makeAddr("bob") using forge`
|
|
receiver: Bytes::from_str("0x1d96f2f6bef1202e4ce1ff6dad0c2cb002861d3e").unwrap(),
|
|
swaps: vec![swap],
|
|
direct_execution: true,
|
|
router_address: Some(Bytes::zero(20)),
|
|
slippage: None,
|
|
native_action: None,
|
|
};
|
|
|
|
let (protocol_data, executor_address) = encoder
|
|
.encode_strategy(solution, Bytes::zero(20))
|
|
.unwrap();
|
|
let hex_protocol_data = encode(&protocol_data);
|
|
assert_eq!(
|
|
executor_address,
|
|
Bytes::from_str("0x5c2f5a71f67c01775180adc06909288b4c329308").unwrap()
|
|
);
|
|
assert_eq!(
|
|
hex_protocol_data,
|
|
String::from(concat!(
|
|
// in token
|
|
"c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
|
|
// component id
|
|
"a478c2975ab1ea89e8196811f51a7b7ade33eb11",
|
|
// receiver
|
|
"1d96f2f6bef1202e4ce1ff6dad0c2cb002861d3e",
|
|
// zero for one
|
|
"00",
|
|
))
|
|
);
|
|
}
|
|
|
|
#[rstest]
|
|
#[case::no_check_no_slippage(
|
|
None,
|
|
None,
|
|
None,
|
|
U256::from_str("0").unwrap(),
|
|
)]
|
|
#[case::with_check_no_slippage(
|
|
None,
|
|
None,
|
|
Some(BigUint::from_str("3_000_000000000000000000").unwrap()),
|
|
U256::from_str("3_000_000000000000000000").unwrap(),
|
|
)]
|
|
#[case::no_check_with_slippage(
|
|
Some(BigUint::from_str("3_000_000000000000000000").unwrap()),
|
|
Some(0.01f64),
|
|
None,
|
|
U256::from_str("2_970_000000000000000000").unwrap(),
|
|
)]
|
|
#[case::with_check_and_slippage(
|
|
Some(BigUint::from_str("3_000_000000000000000000").unwrap()),
|
|
Some(0.01f64),
|
|
Some(BigUint::from_str("2_999_000000000000000000").unwrap()),
|
|
U256::from_str("2_999_000000000000000000").unwrap(),
|
|
)]
|
|
fn test_split_swap_strategy_encoder_simple_route(
|
|
#[case] expected_amount: Option<BigUint>,
|
|
#[case] slippage: Option<f64>,
|
|
#[case] check_amount: Option<BigUint>,
|
|
#[case] expected_min_amount: U256,
|
|
) {
|
|
// Performs a single swap from WETH to DAI on a USV2 pool
|
|
|
|
// Set up a mock private key for signing
|
|
let private_key =
|
|
"0x123456789abcdef123456789abcdef123456789abcdef123456789abcdef1234".to_string();
|
|
|
|
let weth = Bytes::from_str("0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2").unwrap();
|
|
let dai = Bytes::from_str("0x6b175474e89094c44da98b954eedeac495271d0f").unwrap();
|
|
|
|
let swap = Swap {
|
|
component: ProtocolComponent {
|
|
id: "0xA478c2975Ab1Ea89e8196811F51A7B7Ade33eB11".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: weth.clone(),
|
|
token_out: dai.clone(),
|
|
split: 0f64,
|
|
};
|
|
let swap_encoder_registry = get_swap_encoder_registry();
|
|
let encoder =
|
|
SplitSwapStrategyEncoder::new(private_key, Chain::Ethereum, swap_encoder_registry)
|
|
.unwrap();
|
|
let solution = Solution {
|
|
exact_out: false,
|
|
given_token: weth,
|
|
given_amount: BigUint::from_str("1_000000000000000000").unwrap(),
|
|
checked_token: dai,
|
|
expected_amount,
|
|
slippage,
|
|
check_amount,
|
|
sender: Bytes::from_str("0xcd09f75E2BF2A4d11F3AB23f1389FcC1621c0cc2").unwrap(),
|
|
receiver: Bytes::from_str("0xcd09f75E2BF2A4d11F3AB23f1389FcC1621c0cc2").unwrap(),
|
|
swaps: vec![swap],
|
|
..Default::default()
|
|
};
|
|
let router_address = Bytes::from_str("0x3Ede3eCa2a72B3aeCC820E955B36f38437D01395").unwrap();
|
|
|
|
let (calldata, _) = encoder
|
|
.encode_strategy(solution, router_address)
|
|
.unwrap();
|
|
let expected_min_amount_encoded = hex::encode(U256::abi_encode(&expected_min_amount));
|
|
let expected_input = [
|
|
"4860f9ed", // Function selector
|
|
"0000000000000000000000000000000000000000000000000de0b6b3a7640000", // amount out
|
|
"000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2", // token in
|
|
"0000000000000000000000006b175474e89094c44da98b954eedeac495271d0f", // token out
|
|
&expected_min_amount_encoded, // min amount out
|
|
"0000000000000000000000000000000000000000000000000000000000000000", // wrap
|
|
"0000000000000000000000000000000000000000000000000000000000000000", // unwrap
|
|
"0000000000000000000000000000000000000000000000000000000000000002", // tokens length
|
|
"000000000000000000000000cd09f75e2bf2a4d11f3ab23f1389fcc1621c0cc2", // receiver
|
|
]
|
|
.join("");
|
|
|
|
// after this there is the permit and because of the deadlines (that depend on block time)
|
|
// it's hard to assert
|
|
// "000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2", // token in
|
|
// "0000000000000000000000000000000000000000000000000de0b6b3a7640000", // amount in
|
|
// "0000000000000000000000000000000000000000000000000000000067c205fe", // expiration
|
|
// "0000000000000000000000000000000000000000000000000000000000000000", // nonce
|
|
// "0000000000000000000000002c6a3cd97c6283b95ac8c5a4459ebb0d5fd404f4", // spender
|
|
// "00000000000000000000000000000000000000000000000000000000679a8006", // deadline
|
|
// offset of signature (from start of call data to beginning of length indication)
|
|
// "0000000000000000000000000000000000000000000000000000000000000200",
|
|
// offset of ple encoded swaps (from start of call data to beginning of length indication)
|
|
// "0000000000000000000000000000000000000000000000000000000000000280",
|
|
// length of signature without padding
|
|
// "0000000000000000000000000000000000000000000000000000000000000041",
|
|
// signature + padding
|
|
// "a031b63a01ef5d25975663e5d6c420ef498e3a5968b593cdf846c6729a788186",
|
|
// "1ddaf79c51453cd501d321ee541d13593e3a266be44103eefdf6e76a032d2870",
|
|
// "1b00000000000000000000000000000000000000000000000000000000000000"
|
|
|
|
let expected_swaps = String::from(concat!(
|
|
// length of ple encoded swaps without padding
|
|
"000000000000000000000000000000000000000000000000000000000000005c",
|
|
// ple encoded swaps
|
|
"005a",
|
|
// Swap header
|
|
"00", // token in index
|
|
"01", // token out index
|
|
"000000", // split
|
|
// Swap data
|
|
"5c2f5a71f67c01775180adc06909288b4c329308", // executor address
|
|
"bd0625ab", // selector
|
|
"c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2", // token in
|
|
"a478c2975ab1ea89e8196811f51a7b7ade33eb11", // component id
|
|
"3ede3eca2a72b3aecc820e955b36f38437d01395", // receiver
|
|
"00", // zero2one
|
|
"00", // exact out
|
|
"000000", // padding
|
|
));
|
|
let hex_calldata = encode(&calldata);
|
|
|
|
assert_eq!(hex_calldata[..520], expected_input);
|
|
assert_eq!(hex_calldata[1288..], expected_swaps);
|
|
}
|
|
|
|
#[test]
|
|
fn test_split_swap_strategy_encoder_simple_route_wrap() {
|
|
// Performs a single swap from WETH to DAI on a USV2 pool, wrapping ETH
|
|
// Note: This test does not assert anything. It is only used to obtain integration test
|
|
// data for our router solidity test.
|
|
|
|
// Set up a mock private key for signing
|
|
let private_key =
|
|
"0x123456789abcdef123456789abcdef123456789abcdef123456789abcdef1234".to_string();
|
|
|
|
let dai = Bytes::from_str("0x6b175474e89094c44da98b954eedeac495271d0f").unwrap();
|
|
|
|
let swap = Swap {
|
|
component: ProtocolComponent {
|
|
id: "0xA478c2975Ab1Ea89e8196811F51A7B7Ade33eB11".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: WETH_ADDRESS.clone(),
|
|
token_out: dai.clone(),
|
|
split: 0f64,
|
|
};
|
|
let swap_encoder_registry = get_swap_encoder_registry();
|
|
let encoder =
|
|
SplitSwapStrategyEncoder::new(private_key, Chain::Ethereum, swap_encoder_registry)
|
|
.unwrap();
|
|
let solution = Solution {
|
|
exact_out: false,
|
|
given_token: NATIVE_ADDRESS.clone(),
|
|
given_amount: BigUint::from_str("1_000000000000000000").unwrap(),
|
|
checked_token: dai,
|
|
expected_amount: Some(BigUint::from_str("3_000_000000000000000000").unwrap()),
|
|
check_amount: None,
|
|
sender: Bytes::from_str("0xcd09f75E2BF2A4d11F3AB23f1389FcC1621c0cc2").unwrap(),
|
|
receiver: Bytes::from_str("0xcd09f75E2BF2A4d11F3AB23f1389FcC1621c0cc2").unwrap(),
|
|
swaps: vec![swap],
|
|
native_action: Some(NativeAction::Wrap),
|
|
..Default::default()
|
|
};
|
|
let router_address = Bytes::from_str("0x3Ede3eCa2a72B3aeCC820E955B36f38437D01395").unwrap();
|
|
|
|
let (calldata, _) = encoder
|
|
.encode_strategy(solution, router_address)
|
|
.unwrap();
|
|
|
|
let hex_calldata = encode(&calldata);
|
|
println!("{}", hex_calldata);
|
|
}
|
|
|
|
#[test]
|
|
fn test_split_swap_strategy_encoder_simple_route_unwrap() {
|
|
// Performs a single swap from DAI to WETH on a USV2 pool, unwrapping ETH at the end
|
|
// Note: This test does not assert anything. It is only used to obtain integration test
|
|
// data for our router solidity test.
|
|
|
|
// Set up a mock private key for signing
|
|
let private_key =
|
|
"0x123456789abcdef123456789abcdef123456789abcdef123456789abcdef1234".to_string();
|
|
|
|
let dai = Bytes::from_str("0x6b175474e89094c44da98b954eedeac495271d0f").unwrap();
|
|
|
|
let swap = Swap {
|
|
component: ProtocolComponent {
|
|
id: "0xA478c2975Ab1Ea89e8196811F51A7B7Ade33eB11".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: dai.clone(),
|
|
token_out: WETH_ADDRESS.clone(),
|
|
split: 0f64,
|
|
};
|
|
let swap_encoder_registry = get_swap_encoder_registry();
|
|
let encoder =
|
|
SplitSwapStrategyEncoder::new(private_key, Chain::Ethereum, swap_encoder_registry)
|
|
.unwrap();
|
|
let solution = Solution {
|
|
exact_out: false,
|
|
given_token: dai,
|
|
given_amount: BigUint::from_str("3_000_000000000000000000").unwrap(),
|
|
checked_token: NATIVE_ADDRESS.clone(),
|
|
expected_amount: Some(BigUint::from_str("1_000000000000000000").unwrap()),
|
|
check_amount: None,
|
|
sender: Bytes::from_str("0xcd09f75E2BF2A4d11F3AB23f1389FcC1621c0cc2").unwrap(),
|
|
receiver: Bytes::from_str("0xcd09f75E2BF2A4d11F3AB23f1389FcC1621c0cc2").unwrap(),
|
|
swaps: vec![swap],
|
|
native_action: Some(NativeAction::Unwrap),
|
|
..Default::default()
|
|
};
|
|
let router_address = Bytes::from_str("0x3Ede3eCa2a72B3aeCC820E955B36f38437D01395").unwrap();
|
|
|
|
let (calldata, _) = encoder
|
|
.encode_strategy(solution, router_address)
|
|
.unwrap();
|
|
|
|
let hex_calldata = encode(&calldata);
|
|
println!("{}", hex_calldata);
|
|
}
|
|
|
|
#[test]
|
|
fn test_split_swap_strategy_encoder_complex_route() {
|
|
// Note: This test does not assert anything. It is only used to obtain integration test
|
|
// data for our router solidity test.
|
|
//
|
|
// Performs a split swap from WETH to USDC though WBTC and DAI using USV2 pools
|
|
//
|
|
// ┌──(USV2)──> WBTC ───(USV2)──> USDC
|
|
// WETH ─┤
|
|
// └──(USV2)──> DAI ───(USV2)──> USDC
|
|
//
|
|
|
|
// Set up a mock private key for signing
|
|
let private_key =
|
|
"0x123456789abcdef123456789abcdef123456789abcdef123456789abcdef1234".to_string();
|
|
|
|
let weth = Bytes::from_str("0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2").unwrap();
|
|
let dai = Bytes::from_str("0x6b175474e89094c44da98b954eedeac495271d0f").unwrap();
|
|
let wbtc = Bytes::from_str("0x2260fac5e5542a773aa44fbcfedf7c193bc2c599").unwrap();
|
|
let usdc = Bytes::from_str("0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48").unwrap();
|
|
|
|
let swap_weth_dai = Swap {
|
|
component: ProtocolComponent {
|
|
id: "0xA478c2975Ab1Ea89e8196811F51A7B7Ade33eB11".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: weth.clone(),
|
|
token_out: dai.clone(),
|
|
split: 0.5f64,
|
|
};
|
|
let swap_weth_wbtc = Swap {
|
|
component: ProtocolComponent {
|
|
id: "0xBb2b8038a1640196FbE3e38816F3e67Cba72D940".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: weth.clone(),
|
|
token_out: wbtc.clone(),
|
|
// This represents the remaining 50%, but to avoid any rounding errors we set this to
|
|
// 0 to signify "the remainder of the WETH value". It should still be very close to 50%
|
|
split: 0f64,
|
|
};
|
|
let swap_dai_usdc = Swap {
|
|
component: ProtocolComponent {
|
|
id: "0xAE461cA67B15dc8dc81CE7615e0320dA1A9aB8D5".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: dai.clone(),
|
|
token_out: usdc.clone(),
|
|
split: 0f64,
|
|
};
|
|
let swap_wbtc_usdc = Swap {
|
|
component: ProtocolComponent {
|
|
id: "0x004375Dff511095CC5A197A54140a24eFEF3A416".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: wbtc.clone(),
|
|
token_out: usdc.clone(),
|
|
split: 0f64,
|
|
};
|
|
let swap_encoder_registry = get_swap_encoder_registry();
|
|
let encoder =
|
|
SplitSwapStrategyEncoder::new(private_key, Chain::Ethereum, swap_encoder_registry)
|
|
.unwrap();
|
|
let solution = Solution {
|
|
exact_out: false,
|
|
given_token: weth,
|
|
given_amount: BigUint::from_str("1_000000000000000000").unwrap(),
|
|
checked_token: usdc,
|
|
expected_amount: Some(BigUint::from_str("3_000_000000").unwrap()),
|
|
check_amount: None,
|
|
sender: Bytes::from_str("0xcd09f75E2BF2A4d11F3AB23f1389FcC1621c0cc2").unwrap(),
|
|
receiver: Bytes::from_str("0xcd09f75E2BF2A4d11F3AB23f1389FcC1621c0cc2").unwrap(),
|
|
swaps: vec![swap_weth_dai, swap_weth_wbtc, swap_dai_usdc, swap_wbtc_usdc],
|
|
..Default::default()
|
|
};
|
|
let router_address = Bytes::from_str("0x3Ede3eCa2a72B3aeCC820E955B36f38437D01395").unwrap();
|
|
|
|
let (calldata, _) = encoder
|
|
.encode_strategy(solution, router_address)
|
|
.unwrap();
|
|
|
|
let _hex_calldata = encode(&calldata);
|
|
println!("{}", _hex_calldata);
|
|
}
|
|
|
|
fn get_mock_split_swap_strategy_encoder() -> SplitSwapStrategyEncoder {
|
|
let private_key =
|
|
"0x123456789abcdef123456789abcdef123456789abcdef123456789abcdef1234".to_string();
|
|
let swap_encoder_registry = get_swap_encoder_registry();
|
|
SplitSwapStrategyEncoder::new(private_key, Chain::Ethereum, swap_encoder_registry).unwrap()
|
|
}
|
|
|
|
#[test]
|
|
fn test_validate_path_single_swap() {
|
|
let encoder = get_mock_split_swap_strategy_encoder();
|
|
let weth = Bytes::from_str("0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2").unwrap();
|
|
let dai = Bytes::from_str("0x6b175474e89094c44da98b954eedeac495271d0f").unwrap();
|
|
let swaps = vec![Swap {
|
|
component: ProtocolComponent {
|
|
id: "0xA478c2975Ab1Ea89e8196811F51A7B7Ade33eB11".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: weth.clone(),
|
|
token_out: dai.clone(),
|
|
split: 0f64,
|
|
}];
|
|
let result = encoder.validate_swap_path(&swaps, &weth, &dai, &None);
|
|
assert_eq!(result, Ok(()));
|
|
}
|
|
|
|
#[test]
|
|
fn test_validate_path_multiple_swaps() {
|
|
let encoder = get_mock_split_swap_strategy_encoder();
|
|
let weth = Bytes::from_str("0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2").unwrap();
|
|
let dai = Bytes::from_str("0x6b175474e89094c44da98b954eedeac495271d0f").unwrap();
|
|
let usdc = Bytes::from_str("0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48").unwrap();
|
|
let swaps = vec![
|
|
Swap {
|
|
component: ProtocolComponent {
|
|
id: "0xA478c2975Ab1Ea89e8196811F51A7B7Ade33eB11".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: weth.clone(),
|
|
token_out: dai.clone(),
|
|
split: 0.5f64,
|
|
},
|
|
Swap {
|
|
component: ProtocolComponent {
|
|
id: "0xA478c2975Ab1Ea89e8196811F51A7B7Ade33eB11".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: dai.clone(),
|
|
token_out: usdc.clone(),
|
|
split: 0f64,
|
|
},
|
|
];
|
|
let result = encoder.validate_swap_path(&swaps, &weth, &usdc, &None);
|
|
assert_eq!(result, Ok(()));
|
|
}
|
|
|
|
#[test]
|
|
fn test_validate_path_disconnected() {
|
|
let encoder = get_mock_split_swap_strategy_encoder();
|
|
let weth = Bytes::from_str("0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2").unwrap();
|
|
let dai = Bytes::from_str("0x6b175474e89094c44da98b954eedeac495271d0f").unwrap();
|
|
let usdc = Bytes::from_str("0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48").unwrap();
|
|
let wbtc = Bytes::from_str("0x2260fac5e5542a773aa44fbcfedf7c193bc2c599").unwrap();
|
|
|
|
let disconnected_swaps = vec![
|
|
Swap {
|
|
component: ProtocolComponent {
|
|
id: "pool1".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: weth.clone(),
|
|
token_out: dai.clone(),
|
|
split: 0.5,
|
|
},
|
|
// This swap is disconnected from the WETH->DAI path
|
|
Swap {
|
|
component: ProtocolComponent {
|
|
id: "pool2".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: wbtc.clone(),
|
|
token_out: usdc.clone(),
|
|
split: 0.0,
|
|
},
|
|
];
|
|
let result = encoder.validate_swap_path(&disconnected_swaps, &weth, &usdc, &None);
|
|
assert!(matches!(
|
|
result,
|
|
Err(EncodingError::InvalidInput(msg)) if msg.contains("not reachable through swap path")
|
|
));
|
|
}
|
|
|
|
#[test]
|
|
fn test_validate_path_unreachable_checked_token() {
|
|
let encoder = get_mock_split_swap_strategy_encoder();
|
|
let weth = Bytes::from_str("0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2").unwrap();
|
|
let dai = Bytes::from_str("0x6b175474e89094c44da98b954eedeac495271d0f").unwrap();
|
|
let usdc = Bytes::from_str("0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48").unwrap();
|
|
|
|
let unreachable_swaps = vec![Swap {
|
|
component: ProtocolComponent {
|
|
id: "pool1".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: weth.clone(),
|
|
token_out: dai.clone(),
|
|
split: 1.0,
|
|
}];
|
|
let result = encoder.validate_swap_path(&unreachable_swaps, &weth, &usdc, &None);
|
|
assert!(matches!(
|
|
result,
|
|
Err(EncodingError::InvalidInput(msg)) if msg.contains("not reachable through swap path")
|
|
));
|
|
}
|
|
|
|
#[test]
|
|
fn test_validate_path_empty_swaps() {
|
|
let encoder = get_mock_split_swap_strategy_encoder();
|
|
let weth = Bytes::from_str("0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2").unwrap();
|
|
let usdc = Bytes::from_str("0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48").unwrap();
|
|
|
|
let empty_swaps: Vec<Swap> = vec![];
|
|
let result = encoder.validate_swap_path(&empty_swaps, &weth, &usdc, &None);
|
|
assert!(matches!(
|
|
result,
|
|
Err(EncodingError::InvalidInput(msg)) if msg.contains("not reachable through swap path")
|
|
));
|
|
}
|
|
|
|
#[test]
|
|
fn test_validate_swap_single() {
|
|
let encoder = get_mock_split_swap_strategy_encoder();
|
|
let weth = Bytes::from_str("0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2").unwrap();
|
|
let dai = Bytes::from_str("0x6b175474e89094c44da98b954eedeac495271d0f").unwrap();
|
|
let swaps = vec![Swap {
|
|
component: ProtocolComponent {
|
|
id: "0xA478c2975Ab1Ea89e8196811F51A7B7Ade33eB11".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: weth.clone(),
|
|
token_out: dai.clone(),
|
|
split: 0f64,
|
|
}];
|
|
let result = encoder.validate_split_percentages(&swaps);
|
|
assert_eq!(result, Ok(()));
|
|
}
|
|
|
|
#[test]
|
|
fn test_validate_swaps_multiple() {
|
|
let weth = Bytes::from_str("0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2").unwrap();
|
|
let dai = Bytes::from_str("0x6b175474e89094c44da98b954eedeac495271d0f").unwrap();
|
|
|
|
// Valid case: Multiple swaps with proper splits (50%, 30%, remainder)
|
|
let valid_swaps = vec![
|
|
Swap {
|
|
component: ProtocolComponent {
|
|
id: "pool1".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: weth.clone(),
|
|
token_out: dai.clone(),
|
|
split: 0.5,
|
|
},
|
|
Swap {
|
|
component: ProtocolComponent {
|
|
id: "pool2".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: weth.clone(),
|
|
token_out: dai.clone(),
|
|
split: 0.3,
|
|
},
|
|
Swap {
|
|
component: ProtocolComponent {
|
|
id: "pool3".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: weth.clone(),
|
|
token_out: dai.clone(),
|
|
split: 0.0, // Remainder (20%)
|
|
},
|
|
];
|
|
let encoder = get_mock_split_swap_strategy_encoder();
|
|
assert!(encoder
|
|
.validate_split_percentages(&valid_swaps)
|
|
.is_ok());
|
|
}
|
|
|
|
#[test]
|
|
fn test_validate_swaps_no_remainder_split() {
|
|
let weth = Bytes::from_str("0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2").unwrap();
|
|
let dai = Bytes::from_str("0x6b175474e89094c44da98b954eedeac495271d0f").unwrap();
|
|
|
|
let invalid_total_swaps = vec![
|
|
Swap {
|
|
component: ProtocolComponent {
|
|
id: "pool1".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: weth.clone(),
|
|
token_out: dai.clone(),
|
|
split: 0.7,
|
|
},
|
|
Swap {
|
|
component: ProtocolComponent {
|
|
id: "pool2".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: weth.clone(),
|
|
token_out: dai.clone(),
|
|
split: 0.3,
|
|
},
|
|
];
|
|
let encoder = get_mock_split_swap_strategy_encoder();
|
|
assert!(matches!(
|
|
encoder.validate_split_percentages(&invalid_total_swaps),
|
|
Err(EncodingError::InvalidInput(msg)) if msg.contains("must have exactly one 0% split")
|
|
));
|
|
}
|
|
|
|
#[test]
|
|
fn test_validate_swaps_zero_split_not_at_end() {
|
|
let weth = Bytes::from_str("0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2").unwrap();
|
|
let dai = Bytes::from_str("0x6b175474e89094c44da98b954eedeac495271d0f").unwrap();
|
|
|
|
let invalid_zero_position_swaps = vec![
|
|
Swap {
|
|
component: ProtocolComponent {
|
|
id: "pool1".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: weth.clone(),
|
|
token_out: dai.clone(),
|
|
split: 0.0,
|
|
},
|
|
Swap {
|
|
component: ProtocolComponent {
|
|
id: "pool2".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: weth.clone(),
|
|
token_out: dai.clone(),
|
|
split: 0.5,
|
|
},
|
|
];
|
|
let encoder = get_mock_split_swap_strategy_encoder();
|
|
assert!(matches!(
|
|
encoder.validate_split_percentages(&invalid_zero_position_swaps),
|
|
Err(EncodingError::InvalidInput(msg)) if msg.contains("must be the last swap")
|
|
));
|
|
}
|
|
|
|
#[test]
|
|
fn test_validate_swaps_splits_exceed_hundred_percent() {
|
|
let weth = Bytes::from_str("0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2").unwrap();
|
|
let dai = Bytes::from_str("0x6b175474e89094c44da98b954eedeac495271d0f").unwrap();
|
|
|
|
let invalid_overflow_swaps = vec![
|
|
Swap {
|
|
component: ProtocolComponent {
|
|
id: "pool1".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: weth.clone(),
|
|
token_out: dai.clone(),
|
|
split: 0.6,
|
|
},
|
|
Swap {
|
|
component: ProtocolComponent {
|
|
id: "pool2".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: weth.clone(),
|
|
token_out: dai.clone(),
|
|
split: 0.5,
|
|
},
|
|
Swap {
|
|
component: ProtocolComponent {
|
|
id: "pool3".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: weth.clone(),
|
|
token_out: dai.clone(),
|
|
split: 0.0,
|
|
},
|
|
];
|
|
let encoder = get_mock_split_swap_strategy_encoder();
|
|
assert!(matches!(
|
|
encoder.validate_split_percentages(&invalid_overflow_swaps),
|
|
Err(EncodingError::InvalidInput(msg)) if msg.contains("must be <100%")
|
|
));
|
|
}
|
|
|
|
#[test]
|
|
fn test_validate_path_wrap_eth_given_token() {
|
|
let encoder = get_mock_split_swap_strategy_encoder();
|
|
|
|
let eth = Bytes::from_str("0x0000000000000000000000000000000000000000").unwrap();
|
|
let usdc = Bytes::from_str("0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48").unwrap();
|
|
let weth = Bytes::from_str("0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2").unwrap();
|
|
|
|
let swaps = vec![Swap {
|
|
component: ProtocolComponent {
|
|
id: "pool1".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: weth.clone(),
|
|
token_out: usdc.clone(),
|
|
split: 0f64,
|
|
}];
|
|
|
|
let result = encoder.validate_swap_path(&swaps, ð, &usdc, &Some(NativeAction::Wrap));
|
|
assert_eq!(result, Ok(()));
|
|
}
|
|
|
|
#[test]
|
|
fn test_validate_token_path_connectivity_wrap_eth_checked_token() {
|
|
let encoder = get_mock_split_swap_strategy_encoder();
|
|
|
|
let eth = Bytes::from_str("0x0000000000000000000000000000000000000000").unwrap();
|
|
let usdc = Bytes::from_str("0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48").unwrap();
|
|
let weth = Bytes::from_str("0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2").unwrap();
|
|
|
|
let swaps = vec![Swap {
|
|
component: ProtocolComponent {
|
|
id: "pool1".to_string(),
|
|
protocol_system: "uniswap_v2".to_string(),
|
|
..Default::default()
|
|
},
|
|
token_in: usdc.clone(),
|
|
token_out: weth.clone(),
|
|
split: 0f64,
|
|
}];
|
|
|
|
let result = encoder.validate_swap_path(&swaps, &usdc, ð, &Some(NativeAction::Unwrap));
|
|
assert_eq!(result, Ok(()));
|
|
}
|
|
}
|