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Attempt to make swap example work #567

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Attempt to make swap example work #567

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42 changes: 18 additions & 24 deletions balancer-js/examples/swaps/swap.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -4,46 +4,40 @@
* How to run:
* yarn example examples/swaps/swap.ts
*/
import { FORK_NODES, RPC_URLS } from '@/test/lib/utils';
import { BalancerSDK, Network } from '@balancer-labs/sdk';
import { formatFixed } from '@ethersproject/bignumber';
import { AddressZero } from '@ethersproject/constants';
import { formatFixed, parseFixed } from '@ethersproject/bignumber';
import { reset } from 'examples/helpers/forked-utils';

const tokenIn = AddressZero; // eth
const tokenOut = '0x2260fac5e5542a773aa44fbcfedf7c193bc2c599'; // wBTC
const amount = String(BigInt(100e18)); // 100 eth
const tokenIn = '0xfd086bc7cd5c481dcc9c85ebe478a1c0b69fcbb9';
const tokenInDecimals = 6;
const tokenOut = '0x95ab45875cffdba1e5f451b950bc2e42c0053f39';
const tokenOutDecimals = 18;
const amount = parseFixed('100', tokenInDecimals).toString();

const network = Network.ARBITRUM;
const sdk = new BalancerSDK({
network: Network.MAINNET,
rpcUrl: `http://127.0.0.1:8545`, // Uses a local fork for simulating transaction sending.
network,
rpcUrl: RPC_URLS[network],
});

const { swaps } = sdk;

const erc20Out = sdk.contracts.ERC20(tokenOut, sdk.provider);

async function swap() {
await reset(sdk.provider);
await reset(sdk.provider, undefined, FORK_NODES[network]);

const signer = sdk.provider.getSigner();
const account = await signer.getAddress();

// Finding a trading route rely on on-chain data.
// fetchPools will fetch the current data from the subgraph.
// Let's fetch just 5 pools with highest liquidity of tokenOut.
await swaps.fetchPools({
first: 5,
where: {
swapEnabled: {
eq: true,
},
tokensList: {
contains: [tokenOut],
},
},
orderBy: 'totalLiquidity',
orderDirection: 'desc',
});
const poolsFetched = await swaps.fetchPools();
console.log('Pools fetched:', poolsFetched);

const pools = swaps.getPools();
console.log('Pools:', pools);

// Set exectution deadline to 60 seconds from now
const deadline = String(Math.ceil(Date.now() / 1000) + 60);
Expand Down Expand Up @@ -83,9 +77,9 @@ async function swap() {
const balanceAfter = await erc20Out.balanceOf(account);

console.log(
`Amount of BTC received: ${formatFixed(
`Amount of token out received: ${formatFixed(
balanceAfter.sub(balanceBefore),
8
tokenOutDecimals
)}`
);
} catch (err) {
Expand Down
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