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mintDaiAndSwap.ts
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mintDaiAndSwap.ts
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import { Order, OrderBalance, OrderKind } from '@cowprotocol/contracts';
import { CowShedSdk, ICall } from '../ts';
import {
ABI_CODER,
COW,
DAI,
DAI_JOIN,
ETH_A_JOIN,
VAT,
VAULT_RELAYER,
WETH,
approveToken,
createOrder,
fnCalldata,
getIlk,
joinEth,
resolveName,
settleOrder,
vatHope,
withAnvilProvider,
wrapEther,
} from './common';
import { ethers } from 'ethers_v6';
const mintDaiAndSwap: Parameters<typeof withAnvilProvider>[0] = async (
provider: ethers.JsonRpcProvider,
signers: ethers.Wallet[],
{ factory, implementation, proxyInitCode }
) => {
// initialize the sdk
const shedSdk = new CowShedSdk({
factoryAddress: factory,
implementationAddress: implementation,
proxyCreationCode: proxyInitCode,
chainId: 1,
});
const user = signers[1];
// collateral to deposit
const collateral = ethers.parseEther('10');
// debt to take out
const daiDebt = ethers.parseEther('8000');
const proxyAddress = shedSdk.computeProxyAddress(user.address);
console.log(
'Computed proxy address for user',
user.address,
'is',
proxyAddress
);
await wrapEther(provider, user.address, collateral);
// allow proxy to take actions on behalf of the user
await vatHope(provider, user.address, proxyAddress);
// approve and deposit WETH into WETH Join
await approveToken(provider, WETH, user.address, ETH_A_JOIN, collateral);
await joinEth(provider, user.address, collateral);
const validTo = Math.floor(new Date().getTime() / 1000) + 7200;
const buyAmount = ethers.parseEther('100');
// create a sell order for DAI to COW
const order: Order = {
sellToken: DAI,
buyToken: COW,
receiver: user.address,
sellAmount: daiDebt,
buyAmount,
validTo,
appData: '',
feeAmount: 0n,
kind: OrderKind.SELL,
partiallyFillable: true,
sellTokenBalance: OrderBalance.ERC20,
buyTokenBalance: OrderBalance.ERC20,
};
const ilk = await getIlk(provider, ETH_A_JOIN);
// pre hooks, need to borrow the DAI right before the swap, in the pre hook
const calls: ICall[] = [
// create cdp on behalf of the user
{
target: VAT,
isDelegateCall: false,
value: 0n,
allowFailure: false,
callData: fnCalldata(
'frob(bytes32,address,address,address,int256,int256)',
ABI_CODER.encode(
['bytes32', 'address', 'address', 'address', 'int256', 'int256'],
[ilk, user.address, user.address, proxyAddress, collateral, daiDebt]
)
),
},
// approve dai join to mint the dai
{
allowFailure: false,
target: VAT,
value: 0n,
isDelegateCall: false,
callData: fnCalldata(
'hope(address)',
ABI_CODER.encode(['address'], [DAI_JOIN])
),
},
// withdraw the debt dai to the user address
{
allowFailure: false,
target: DAI_JOIN,
value: 0n,
isDelegateCall: false,
callData: fnCalldata(
'exit(address,uint256)',
ABI_CODER.encode(['address', 'uint256'], [user.address, daiDebt])
),
},
];
const nonce = ethers.encodeBytes32String('first');
// signing the hooks intent
const hashToSign = shedSdk.hashToSignWithUser(
calls,
nonce,
BigInt(validTo),
user.address
);
console.log('hash to sign', hashToSign);
const signature = user.signingKey.sign(hashToSign);
console.log('actual signature', signature.r, signature.s, signature.v);
const encodedSignature = CowShedSdk.encodeEOASignature(
BigInt(signature.r),
BigInt(signature.s),
signature.v
);
const hooksCalldata = CowShedSdk.encodeExecuteHooksForFactory(
calls,
nonce,
BigInt(validTo),
user.address,
encodedSignature
);
const hooks = {
pre: [{ target: factory, callData: hooksCalldata, gasLimit: '1000000000' }],
};
// approve dai to the vault relayer
await approveToken(provider, DAI, user.address, VAULT_RELAYER, daiDebt);
// create order
const orderTx = await createOrder(provider, order, hooks, user.address);
console.log('Create order tx', orderTx?.hash);
// settle order
const settleTx = await settleOrder(provider, order, hooks, user.address);
console.log('Settle tx', settleTx?.hash);
const resolvedAddressLowerCase = await resolveName(
provider,
`${user.address.toLowerCase()}.cowhooks.eth`
);
const resolvedAddressChecksummed = await resolveName(
provider,
`${ethers.getAddress(user.address)}.cowhooks.eth`
);
const proxyName = await provider.lookupAddress(proxyAddress);
console.log({
resolvedAddressLowerCase,
resolvedAddressChecksummed,
proxyName,
proxyAddress,
userAddress: user.address,
});
};
const main = async () => {
await withAnvilProvider(mintDaiAndSwap, 60_000_000);
};
main();