ethers-rs/examples/remove_liquidity.rs

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Rust
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use ethers::prelude::*;
use eyre::Result;
use std::{convert::TryFrom, sync::Arc};
abigen!(
UniswapV2Router,
r#"[
removeLiquidity(address tokenA,address tokenB, uint liquidity,uint amountAMin, uint amountBMin, address to, uint ) external returns (uint amountA, uint amountB)
]"#,
);
abigen!(
UniswapV2Pair,
r#"[
approve(address,uint256)(bool)
getReserves()(uint112,uint112,uint32)
token0()(address)
token1()(address)
]"#
);
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fn main() {}
// Remove liquidity from uniswap V2.
// This example will remove 500 liquidity of 2 test tokens, TA and TB on goerli testnet.
// This example uses pair contract and uniswap swap contract to remove liquidity.
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#[allow(dead_code)]
async fn example() -> Result<()> {
let provider = Arc::new({
// connect to the network
let provider = Provider::<Http>::try_from(
"https://rinkeby.infura.io/v3/a111fcada47746d990e0e2b7df50d00a",
)?;
let chain_id = provider.get_chainid().await?;
// this wallet's private key
let wallet = "725fd1619b2653b7ff1806bf29ae11d0568606d83777afd5b1f2e649bd5132a9"
.parse::<LocalWallet>()?
.with_chain_id(chain_id.as_u64());
SignerMiddleware::new(provider, wallet)
});
let pair = "0xA6108E4d436bE592bAc12F9A0aB7D9A10d821176".parse::<Address>()?;
let pair = UniswapV2Pair::new(pair, provider.clone());
let router = "0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D".parse::<Address>()?;
let router = UniswapV2Router::new(router, provider.clone());
let (reserve0, reserve1, _) = pair.get_reserves().call().await?;
println!("Reserves (token A, Token B): ({reserve0}, {reserve1})");
let price =
if reserve0 > reserve1 { 1000 * reserve0 / reserve1 } else { 1000 * reserve1 / reserve0 } /
1000;
println!("token0 / token1 price = {price}");
let liquidity = 100.into();
println!("Approving the transaction!");
let receipt =
pair.approve(router.address(), liquidity).send().await?.await?.expect("no receipt found");
println!("contract approved succesfully!");
println!("{receipt:?}");
println!("Removing {liquidity} liquidity!");
let token0 = pair.token_0().call().await?;
let token1 = pair.token_1().call().await?;
let receipt = router
.remove_liquidity(
token0,
token1,
liquidity,
0.into(),
0.into(),
provider.address(),
U256::MAX,
)
.send()
.await?
.await?
.expect("no receipt for remove_liquidity");
println!("liquidity removed succesfully!");
println!("{receipt:?}");
Ok(())
}