suavex_call for anvil

[zeroXbrock]

enables suapp devs to use anvil as the eth provider for your suave mevm, forking any chain (e.g. eth mainnet) to test your suapps locally.

instructions

build this version of anvil and run it, then send a curl request to test:

cargo build --bin anvil
export FORK_URL=https://eth-goerli.g.alchemy.com/v2/YOUR_KEY_HERE
./target/debug/anvil --chain-id 5 -f $FORK_URL -p 8555
# call uniswapV2 router's `getAmountOut`
# note: curl, jq, base64, and hexdump are required
curl -s -X POST --data '{"jsonrpc":"2.0","method":"suavex_call","params":["0x7a250d5630b4cf539739df2c5dacb4c659f2488d", "BU1Q1AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABpaWlpAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEJCQkJCQkIAAAAAAAAAAAAAAAAAAAAAAAAAABMTExMTExMTExMTEw=="],"id":1}' -H "Content-Type: application/json" http://localhost:8555 | jq -r .result | base64 -d | hexdump -v -e '/1 "%02x"'

in another terminal, run suave devnet with the --suave.eth.remote_endpoint flag to connect it to anvil:

# in suave-geth/
./build/bin/suave \
    --dev \
    --dev.gaslimit=30000000 \
    --http \
    --http.port=8545 \
    --http.vhosts='*' \
    --http.corsdomain='*' \
    --ws \
    --ws.origins='*' \
    --datadir=./suave/devenv/data \
    --keystore=./suave/devenv/suave-ex-node/keystore \
    --unlock=0xB5fEAfbDD752ad52Afb7e1bD2E40432A485bBB7F \
    --password=./suave/devenv/suave-ex-node/password.txt \
    --suave.eth.remote_endpoint=http://localhost:8555

then write SUAVE-enabled smart contracts that use suavex_-reliant precompiles:

library UniV2Swop {
    address public constant router = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;

    /// Returns market price sans fees.
    function getAmountOut(
        uint256 amountIn,
        uint256 reserveIn,
        uint256 reserveOut
    ) internal view returns (uint256 price) {
        bytes memory result = Suave.ethcall(
            router,
            abi.encodeWithSignature(
                "getAmountOut(uint256,uint256,uint256)",
                amountIn,
                reserveIn,
                reserveOut
            )
        );
        require(result.length > 0, "UniV2Swop: no result");
        (price) = abi.decode(result, (uint256));
    }
}

write SuaveEnabled tests with forge:

function testGetAmountOut() public {
    uint256 amountIn = 0x69696969;
    uint256 reserveIn = 0x42424242424242;
    uint256 reserveOut = 0x131313131313131313131313;
    uint256 amountOut = UniV2Swop.getAmountOut(
        amountIn,
        reserveIn,
        reserveOut
    );
    assertEq(amountOut, 558102013055677511204);
}