Multicall

An Arbitrum Stylus version implementation of Solidity Multi Call contract that aggregates multiple queries using a for loop and RawCall.

Example implementation of a Multi Call contract written in Rust: Here is the interface for TimeLock.

/**
 * This file was automatically generated by Stylus and represents a Rust program.
 * For more information, please see [The Stylus SDK](https://github.com/OffchainLabs/stylus-sdk-rs).
 */

// SPDX-License-Identifier: MIT-OR-APACHE-2.0
pragma solidity ^0.8.23;

interface IMultiCall {
    function multicall(address[] memory addresses, bytes[] memory data) external view returns (bytes[] memory);

    error ArraySizeNotMatch();

    error CallFailed(uint256);
}

src/lib.rs

note

This code has yet to be audited. Please use at your own risk.

#![cfg_attr(not(feature = "export-abi"), no_main)]
extern crate alloc;

#[global_allocator]
static ALLOC: mini_alloc::MiniAlloc = mini_alloc::MiniAlloc::INIT;

use alloy_primitives::U256;
use alloy_sol_types::sol;
use stylus_sdk::{abi::Bytes, alloy_primitives::Address, call::RawCall, prelude::*};

#[solidity_storage]
#[entrypoint]
pub struct MultiCall;

// Declare events and Solidity error types
sol! {
    error ArraySizeNotMatch();
    error CallFailed(uint256 call_index);
}

#[derive(SolidityError)]
pub enum MultiCallErrors {
    ArraySizeNotMatch(ArraySizeNotMatch),
    CallFailed(CallFailed),
}

#[external]
impl MultiCall {
    pub fn multicall(
        &self,
        addresses: Vec<Address>,
        data: Vec<Bytes>,
    ) -> Result<Vec<Bytes>, MultiCallErrors> {
        let addr_len = addresses.len();
        let data_len = data.len();
        let mut results: Vec<Bytes> = Vec::new();
        if addr_len != data_len {
            return Err(MultiCallErrors::ArraySizeNotMatch(ArraySizeNotMatch {}));
        }
        for i in 0..addr_len {
            let result = RawCall::new().call(addresses[i], data[i].to_vec().as_slice())
                .map_err(|_| MultiCallErrors::CallFailed(CallFailed { call_index: U256::from(i) }))?;
            results.push(result.into());
}
        Ok(results)
    }
}

Cargo.toml

[package]
name = "stylus-multi-call-contract"
version = "0.1.5"
edition = "2021"
license = "MIT OR Apache-2.0"
keywords = ["arbitrum", "ethereum", "stylus", "alloy"]
description = "Stylus multi call example"

[dependencies]
alloy-primitives = "0.3.1"
alloy-sol-types = "0.3.1"
mini-alloc = "0.4.2"
stylus-sdk = "0.5.0"
hex = "0.4.3"

[dev-dependencies]
tokio = { version = "1.12.0", features = ["full"] }
ethers = "2.0"
eyre = "0.6.8"

[features]
export-abi = ["stylus-sdk/export-abi"]

[[bin]]
name = "stylus-multi-call"
path = "src/main.rs"

[lib]
crate-type = ["lib", "cdylib"]

[profile.release]
codegen-units = 1
strip = true
lto = true
panic = "abort"
opt-level = "s"