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fixes: fee application to swap quote

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commit 4931ef1d70
Author: Mohammed Sohail <sohailsameja@gmail.com>
Date:   Tue Mar 26 16:56:44 2024 +0800

    fix: include fees in public liquidity

commit 78844169c5
Author: Mohammed Sohail <sohailsameja@gmail.com>
Date:   Thu Mar 21 17:00:33 2024 +0800

    update: fix-pool builds

commit ab897bf901
Author: Mohammed Sohail <sohailsameja@gmail.com>
Date:   Thu Mar 21 16:57:06 2024 +0800

    fix: apply fee after quote. Exclude fees from public liquidity

commit c38fb552e9
Author: Mohammed Sohail <sohailsameja@gmail.com>
Date:   Thu Mar 21 13:09:29 2024 +0800

    feat: make getQuote a public function

    * useful for 3rd part integration. No need to make a 2nd call to the quoter.
This commit is contained in:
Mohamed Sohail 2024-04-08 12:13:50 +08:00
parent f812790610
commit 561c4b3a71
Signed by: kamikazechaser
GPG Key ID: 7DD45520C01CD85D
5 changed files with 16 additions and 10 deletions
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1
.gitignore vendored
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@ -5,3 +5,4 @@ build/
dist/ dist/
solidity/*.json solidity/*.json
solidity/*.bin solidity/*.bin
.venv

2
python/erc20_pool/data/SwapPool.bin
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2
python/erc20_pool/data/SwapPool.json
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2
python/erc20_pool/data/SwapPool.metadata.json
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19
solidity/SwapPool.sol
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@ -119,7 +119,7 @@ contract SwapPool {
return fee; return fee;
} }
function getQuote(address _outToken, address _inToken, uint256 _value) private returns (uint256) { function getQuote(address _outToken, address _inToken, uint256 _value) public returns (uint256) {
bool r; bool r;
bytes memory v; bytes memory v;
uint256 quote; uint256 quote;
@ -137,22 +137,26 @@ contract SwapPool {
function withdraw(address _outToken, address _inToken, uint256 _value) public { function withdraw(address _outToken, address _inToken, uint256 _value) public {
bool r; bool r;
bytes memory v; bytes memory v;
uint256 netValue;
uint256 balance; uint256 balance;
uint256 fee; uint256 fee;
uint256 outValue;
fee = getFee(_value); outValue = getQuote(_outToken, _inToken, _value);
netValue = _value - fee;
netValue = getQuote(_outToken, _inToken, netValue);
(r, v) = _outToken.call(abi.encodeWithSignature("balanceOf(address)", this)); (r, v) = _outToken.call(abi.encodeWithSignature("balanceOf(address)", this));
require(r, "ERR_TOKEN"); require(r, "ERR_TOKEN");
balance = abi.decode(v, (uint256)); balance = abi.decode(v, (uint256));
require(balance >= netValue + fee, "ERR_BALANCE");
// deduct the fees from the quoted outValue
fee = getFee(outValue);
outValue -= fee;
// pool should have enough balance to cover the final outValue (fees already deducted)
require(balance >= outValue, "ERR_BALANCE");
deposit(_inToken, _value); deposit(_inToken, _value);
(r, v) = _outToken.call(abi.encodeWithSignature('transfer(address,uint256)', msg.sender, netValue)); (r, v) = _outToken.call(abi.encodeWithSignature('transfer(address,uint256)', msg.sender, outValue));
require(r, "ERR_TOKEN"); require(r, "ERR_TOKEN");
r = abi.decode(v, (bool)); r = abi.decode(v, (bool));
require(r, "ERR_TRANSFER"); require(r, "ERR_TRANSFER");
@ -235,3 +239,4 @@ contract SwapPool {
return false; return false;
} }
} }