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use crate::{
EvmError,
abi::{IERC20, IMulticall, IPancakePair, IPancakeRouter02, i_multicall},
};
use ethers::{
abi::AbiDecode,
types::{Address, U256},
};
use evm_sdk::Evm;
use std::collections::HashMap;
use std::sync::Arc;
/// Represents the result of a multicall operation
#[derive(Debug, Clone)]
pub struct MulticallResult {
pub success: bool,
pub data: Vec<u8>,
pub gas_used: U256,
}
/// Service for executing multiple Ethereum calls in a single transaction
pub struct MulticallService {
evm: Arc<Evm>,
}
impl MulticallService {
/// Creates a new MulticallService instance
pub fn new(evm: Arc<Evm>) -> Self {
Self { evm: evm }
}
/// Executes a batch of calls using the multicall contract
///
/// # Example
/// ```
/// use ethers::types::{Address, U256};
/// use multicall::MulticallService;
///
/// async fn example(service: MulticallService, multicall_addr: Address) -> Result<(), Box<dyn std::error::Error>> {
/// let calls = vec![
/// Call::new(token_address, balance_of_calldata),
/// Call::new(pair_address, get_reserves_calldata),
/// ];
/// let results = service.aggregate(multicall_addr, calls).await?;
/// Ok(())
/// }
/// ```
pub async fn aggregate(
&self,
multicall_address: Address,
calls: Vec<Call>,
) -> Result<Vec<MulticallResult>, EvmError> {
let multicall = IMulticall::new(multicall_address, self.evm.client.provider.clone());
let call_data: Vec<i_multicall::Call> = calls
.into_iter()
.map(|call| i_multicall::Call {
target: call.target,
call_data: call.data.into(),
})
.collect();
let (block_number, return_data) = multicall
.aggregate(call_data)
.call()
.await
.map_err(|e| EvmError::ContractError(format!("Multicall failed: {}", e)))?;
Ok(return_data
.into_iter()
.map(|data| MulticallResult {
success: true,
data: data.to_vec(),
gas_used: U256::zero(),
})
.collect())
}
/// Batch fetches token balances for multiple tokens for a single user
///
/// # Example
/// ```
/// use ethers::types::{Address, U256};
/// use std::collections::HashMap;
/// use multicall::MulticallService;
///
/// async fn example(service: MulticallService, multicall_addr: Address, user: Address) -> Result<(), Box<dyn std::error::Error>> {
/// let tokens = vec![token1, token2, token3];
/// let balances: HashMap<Address, U256> = service.get_token_balances(multicall_addr, tokens, user).await?;
/// Ok(())
/// }
/// ```
pub async fn get_token_balances(
&self,
multicall_address: Address,
token_addresses: Vec<Address>,
user_address: Address,
) -> Result<HashMap<Address, U256>, EvmError> {
let mut calls = Vec::new();
for token_address in &token_addresses {
let erc20 = IERC20::new(*token_address, self.evm.client.provider.clone());
let call_data = erc20.balance_of(user_address).calldata().ok_or_else(|| {
EvmError::ContractError("Failed to encode balanceOf call".to_string())
})?;
calls.push(Call {
target: *token_address,
data: call_data.to_vec(),
});
}
let results = self.aggregate(multicall_address, calls).await?;
let mut balances = HashMap::new();
for (i, result) in results.into_iter().enumerate() {
if result.success && !result.data.is_empty() {
match U256::decode(&result.data) {
Ok(balance) => {
balances.insert(token_addresses[i], balance);
}
Err(e) => {
eprintln!(
"Failed to decode balance for token {}: {}",
token_addresses[i], e
);
}
}
}
}
Ok(balances)
}
/// Batch fetches reserves for multiple liquidity pairs
///
/// # Example
/// ```
/// use ethers::types::{Address, U256};
/// use std::collections::HashMap;
/// use multicall::MulticallService;
///
/// async fn example(service: MulticallService, multicall_addr: Address) -> Result<(), Box<dyn std::error::Error>> {
/// let pairs = vec![pair1, pair2, pair3];
/// let reserves: HashMap<Address, (U256, U256, u32)> = service.get_reserves_batch(multicall_addr, pairs).await?;
/// Ok(())
/// }
/// ```
pub async fn get_reserves_batch(
&self,
multicall_address: Address,
pair_addresses: Vec<Address>,
) -> Result<HashMap<Address, (U256, U256, u32)>, EvmError> {
let mut calls = Vec::new();
for pair_address in &pair_addresses {
let pair = IPancakePair::new(*pair_address, self.evm.client.provider.clone());
let call_data = pair.get_reserves().calldata().ok_or_else(|| {
EvmError::ContractError("Failed to encode getReserves call".to_string())
})?;
calls.push(Call {
target: *pair_address,
data: call_data.to_vec(),
});
}
let results = self.aggregate(multicall_address, calls).await?;
let mut reserves = HashMap::new();
for (i, result) in results.into_iter().enumerate() {
if result.success && result.data.len() >= 96 {
let reserve0 = U256::from_big_endian(&result.data[0..32]);
let reserve1 = U256::from_big_endian(&result.data[32..64]);
let block_timestamp_last =
u32::from_be_bytes(result.data[64..68].try_into().unwrap());
reserves.insert(
pair_addresses[i],
(reserve0, reserve1, block_timestamp_last),
);
}
}
Ok(reserves)
}
/// Batch fetches prices for multiple token pairs using a router
///
/// # Example
/// ```
/// use ethers::types::{Address, U256};
/// use std::collections::HashMap;
/// use multicall::MulticallService;
///
/// async fn example(service: MulticallService, multicall_addr: Address, router_addr: Address) -> Result<(), Box<dyn std::error::Error>> {
/// let token_pairs = vec![(token_in1, token_out1), (token_in2, token_out2)];
/// let amount_in = U256::from(10).pow(18); // 1 token
/// let prices: HashMap<(Address, Address), U256> = service.get_prices_batch(multicall_addr, router_addr, token_pairs, amount_in).await?;
/// Ok(())
/// }
/// ```
pub async fn get_prices_batch(
&self,
multicall_address: Address,
router_address: Address,
token_pairs: Vec<(Address, Address)>,
amount_in: U256,
) -> Result<HashMap<(Address, Address), U256>, EvmError> {
let mut calls = Vec::new();
for (token_in, token_out) in &token_pairs {
let router = IPancakeRouter02::new(router_address, self.evm.client.provider.clone());
let path = vec![*token_in, *token_out];
let call_data = router
.get_amounts_out(amount_in, path.clone())
.calldata()
.ok_or_else(|| {
EvmError::ContractError("Failed to encode getAmountsOut call".to_string())
})?;
calls.push(Call {
target: router_address,
data: call_data.to_vec(),
});
}
let results = self.aggregate(multicall_address, calls).await?;
let mut prices = HashMap::new();
for (i, result) in results.into_iter().enumerate() {
if result.success && result.data.len() >= 64 {
if result.data.len() >= 96 {
let amount_out = U256::from_big_endian(&result.data[64..96]);
prices.insert(token_pairs[i].clone(), amount_out);
}
}
}
Ok(prices)
}
/// Batch fetches balances for multiple tokens and multiple users
///
/// # Example
/// ```
/// use ethers::types::{Address, U256};
/// use std::collections::HashMap;
/// use multicall::MulticallService;
///
/// async fn example(service: MulticallService, multicall_addr: Address) -> Result<(), Box<dyn std::error::Error>> {
/// let tokens = vec![token1, token2];
/// let users = vec![user1, user2, user3];
/// let balances: HashMap<(Address, Address), U256> = service.get_multiple_token_balances(multicall_addr, tokens, users).await?;
/// Ok(())
/// }
/// ```
pub async fn get_multiple_token_balances(
&self,
multicall_address: Address,
token_addresses: Vec<Address>,
user_addresses: Vec<Address>,
) -> Result<HashMap<(Address, Address), U256>, EvmError> {
let mut calls = Vec::new();
for token_address in &token_addresses {
for user_address in &user_addresses {
let erc20 = IERC20::new(*token_address, self.evm.client.provider.clone());
let call_data = erc20.balance_of(*user_address).calldata().ok_or_else(|| {
EvmError::ContractError("Failed to encode balanceOf call".to_string())
})?;
calls.push(Call {
target: *token_address,
data: call_data.to_vec(),
});
}
}
let results = self.aggregate(multicall_address, calls).await?;
let mut balances = HashMap::new();
let mut call_index = 0;
for token_address in &token_addresses {
for user_address in &user_addresses {
if let Some(result) = results.get(call_index) {
if result.success && !result.data.is_empty() {
match U256::decode(&result.data) {
Ok(balance) => {
balances.insert((*token_address, *user_address), balance);
}
Err(e) => {
eprintln!(
"Failed to decode balance for token {} user {}: {}",
token_address, user_address, e
);
}
}
}
}
call_index += 1;
}
}
Ok(balances)
}
}
#[derive(Debug, Clone)]
pub struct Call {
pub target: Address,
pub data: Vec<u8>,
}
impl Call {
pub fn new(target: Address, data: Vec<u8>) -> Self {
Self { target, data }
}
}