From 5a34653d099fb878f18e6fc344969874a16e58ab Mon Sep 17 00:00:00 2001 From: Rado M Date: Thu, 19 Dec 2024 09:05:07 +0200 Subject: [PATCH] uniswap swap logic --- .env.example | 2 + .gitignore | 4 +- Makefile | 3 +- go.mod | 34 +++++ go.sum | 178 ++++++++++++++++++++++++++ main.go | 92 ++++++++++++++ uniswap/client.go | 318 ++++++++++++++++++++++++++++++++++++++++++++++ uniswap/util.go | 22 ++++ 8 files changed, 651 insertions(+), 2 deletions(-) create mode 100644 .env.example create mode 100644 go.mod create mode 100644 go.sum create mode 100644 main.go create mode 100644 uniswap/client.go create mode 100644 uniswap/util.go diff --git a/.env.example b/.env.example new file mode 100644 index 0000000..d940cef --- /dev/null +++ b/.env.example @@ -0,0 +1,2 @@ +INFURA_ETHEREUM_MAINNET="" +PRIVATE_KEY="" \ No newline at end of file diff --git a/.gitignore b/.gitignore index 2eea525..c4f4f6e 100644 --- a/.gitignore +++ b/.gitignore @@ -1 +1,3 @@ -.env \ No newline at end of file +.env +tmp +anvil-state.json diff --git a/Makefile b/Makefile index 56613c8..d89f1ee 100644 --- a/Makefile +++ b/Makefile @@ -1,8 +1,9 @@ INFURA_ETHEREUM_MAINNET="" +BLOCK_NUMBER=21432092 start-network: anvil --fork-url $(INFURA_ETHEREUM_MAINNET) \ - --fork-block-number 21422200 \ + --fork-block-number $(BLOCK_NUMBER) \ --accounts 10 --balance 1000000 \ --mnemonic "test test test test test test test test test test test junk" \ --state anvil-state.json diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..55449c1 --- /dev/null +++ b/go.mod @@ -0,0 +1,34 @@ +module github.com/LimeChain/vulti-mono + +go 1.23.3 + +require github.com/ethereum/go-ethereum v1.14.12 + +require ( + github.com/Microsoft/go-winio v0.6.2 // indirect + github.com/StackExchange/wmi v1.2.1 // indirect + github.com/bits-and-blooms/bitset v1.13.0 // indirect + github.com/consensys/bavard v0.1.13 // indirect + github.com/consensys/gnark-crypto v0.12.1 // indirect + github.com/crate-crypto/go-ipa v0.0.0-20240223125850-b1e8a79f509c // indirect + github.com/crate-crypto/go-kzg-4844 v1.0.0 // indirect + github.com/deckarep/golang-set/v2 v2.6.0 // indirect + github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1 // indirect + github.com/ethereum/c-kzg-4844 v1.0.0 // indirect + github.com/ethereum/go-verkle v0.1.1-0.20240829091221-dffa7562dbe9 // indirect + github.com/fsnotify/fsnotify v1.6.0 // indirect + github.com/go-ole/go-ole v1.3.0 // indirect + github.com/google/uuid v1.3.0 // indirect + github.com/gorilla/websocket v1.4.2 // indirect + github.com/holiman/uint256 v1.3.1 // indirect + github.com/mmcloughlin/addchain v0.4.0 // indirect + github.com/shirou/gopsutil v3.21.4-0.20210419000835-c7a38de76ee5+incompatible // indirect + github.com/supranational/blst v0.3.13 // indirect + github.com/tklauser/go-sysconf v0.3.12 // indirect + github.com/tklauser/numcpus v0.6.1 // indirect + golang.org/x/crypto v0.22.0 // indirect + golang.org/x/exp v0.0.0-20231110203233-9a3e6036ecaa // indirect + golang.org/x/sync v0.7.0 // indirect + golang.org/x/sys v0.22.0 // indirect + rsc.io/tmplfunc v0.0.3 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..7567d34 --- /dev/null +++ b/go.sum @@ -0,0 +1,178 @@ +github.com/DataDog/zstd v1.4.5 h1:EndNeuB0l9syBZhut0wns3gV1hL8zX8LIu6ZiVHWLIQ= +github.com/DataDog/zstd v1.4.5/go.mod h1:1jcaCB/ufaK+sKp1NBhlGmpz41jOoPQ35bpF36t7BBo= +github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY= +github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU= +github.com/StackExchange/wmi v1.2.1 h1:VIkavFPXSjcnS+O8yTq7NI32k0R5Aj+v39y29VYDOSA= +github.com/StackExchange/wmi v1.2.1/go.mod h1:rcmrprowKIVzvc+NUiLncP2uuArMWLCbu9SBzvHz7e8= +github.com/VictoriaMetrics/fastcache v1.12.2 h1:N0y9ASrJ0F6h0QaC3o6uJb3NIZ9VKLjCM7NQbSmF7WI= +github.com/VictoriaMetrics/fastcache v1.12.2/go.mod h1:AmC+Nzz1+3G2eCPapF6UcsnkThDcMsQicp4xDukwJYI= +github.com/beorn7/perks v1.0.1 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index 0000000..0d862f5 --- /dev/null +++ b/main.go @@ -0,0 +1,92 @@ +package main + +import ( + "log" + "math/big" + "time" + + "os" + + "github.com/LimeChain/vulti-mono/uniswap" + "github.com/ethereum/go-ethereum/common" +) + +const ( + rpcURL = "http://127.0.0.1:8545" +) + +var ( + uniswapV2RouterAddress = common.HexToAddress("0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D") + + tokenInAddress = common.HexToAddress("0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2") // WETH + tokenOutAddress = common.HexToAddress("0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48") // UCDC + + swapAmountIn = big.NewInt(1e18) + amountOutMin = big.NewInt(1) +) + +var ( + signerPrivateKey = os.Getenv("PRIVATE_KEY") +) + +func logTokenBalances(client *uniswap.Client) { + tokenInBalance, err := client.GetTokenBalance(tokenInAddress) + if err != nil { + log.Printf("Error getting input token balance: %v", err) + return + } + log.Printf("input token balance: %s", tokenInBalance.String()) + + tokenOutBalance, err := client.GetTokenBalance(tokenOutAddress) + if err != nil { + log.Printf("Error getting output token balance: %v", err) + return + } + log.Printf("output token balance: %s", tokenOutBalance.String()) +} + +func main() { + cfg := uniswap.Config{ + GasLimitBuffer: 50000, + SwapGasLimit: 1000000, + DeadlineDuration: 15 * time.Minute, + } + + uniswapClient, err := uniswap.NewClient(rpcURL, uniswapV2RouterAddress, signerPrivateKey, cfg) + if err != nil { + log.Fatalf("Failed to initialize Uniswap client: %v", err) + } + + tokensPair := []common.Address{tokenInAddress, tokenOutAddress} + + // fetch token pair amount out + expectedAmountOut, err := uniswapClient.GetExpectedAmountOut(swapAmountIn, tokensPair) + if err != nil { + log.Fatalf("Failed to get expected amount out: %v", err) + } + log.Println("Expected amount out:", expectedAmountOut.String()) + + // calculate output amount with slippage + slippagePercentage := 1.0 + amountOutMin := uniswapClient.CalculateAmountOutMin(expectedAmountOut, slippagePercentage) + + // mint WETH + log.Println("Minting WETH...") + logTokenBalances(uniswapClient) + if err := uniswapClient.MintWETH(swapAmountIn, tokenInAddress); err != nil { + log.Fatalf("Failed to mint WETH: %v", err) + } + logTokenBalances(uniswapClient) + + // approve Router to spend input token + log.Printf("Approving Uniswap Router to spend %s...", tokenInAddress.Hex()) + if err := uniswapClient.ApproveERC20Token(tokenInAddress, uniswapV2RouterAddress, swapAmountIn); err != nil { + log.Fatalf("Failed to approve token: %v", err) + } + + // swap tokens + if err := uniswapClient.SwapTokens(swapAmountIn, amountOutMin, tokensPair); err != nil { + log.Fatalf("Failed to swap tokens: %v", err) + } + logTokenBalances(uniswapClient) +} diff --git a/uniswap/client.go b/uniswap/client.go new file mode 100644 index 0000000..e5ba4cc --- /dev/null +++ b/uniswap/client.go @@ -0,0 +1,318 @@ +package uniswap + +import ( + "context" + "crypto/ecdsa" + "fmt" + "log" + "math/big" + "strings" + "time" + + "github.com/ethereum/go-ethereum" + "github.com/ethereum/go-ethereum/accounts/abi" + "github.com/ethereum/go-ethereum/accounts/abi/bind" + "github.com/ethereum/go-ethereum/common" + "github.com/ethereum/go-ethereum/core/types" + "github.com/ethereum/go-ethereum/ethclient" +) + +type Config struct { + GasLimitBuffer uint64 + SwapGasLimit uint64 + DeadlineDuration time.Duration +} + +type Client struct { + cfg Config + ethClient *ethclient.Client + routerAddress common.Address + signerAddress common.Address + signerPrivateKey *ecdsa.PrivateKey +} + +func NewClient(rpcUrl string, routerAddress common.Address, hexPrivateKey string, cfg Config) (*Client, error) { + ethClient, err := ethclient.Dial(rpcUrl) + if err != nil { + return nil, err + } + + signerPrivateKey, signerAddress, err := privateKeyAndAddress(hexPrivateKey) + if err != nil { + return nil, err + } + + return &Client{ + cfg, + ethClient, + routerAddress, + signerAddress, + signerPrivateKey, + }, nil +} + +func (uc *Client) MintWETH(amount *big.Int, tokenAddress common.Address) error { + wethABI := `[{"name":"deposit","type":"function","payable":true}]` + parsedABI, err := abi.JSON(strings.NewReader(wethABI)) + if err != nil { + return err + } + + data, err := parsedABI.Pack("deposit") + if err != nil { + return err + } + gasPrice, err := uc.ethClient.SuggestGasPrice(context.Background()) + if err != nil { + return err + } + nonce, err := uc.ethClient.PendingNonceAt(context.Background(), uc.signerAddress) + if err != nil { + return err + } + gasLimit, err := uc.ethClient.EstimateGas(context.Background(), ethereum.CallMsg{ + To: &tokenAddress, + Data: data, + }) + if err != nil { + return err + } + gasLimit += uc.cfg.GasLimitBuffer + tx := types.NewTransaction(nonce, tokenAddress, amount, gasLimit, gasPrice, data) + return uc.sendTransaction(tx) +} + +func (uc *Client) ApproveERC20Token(tokenAddress, spenderAddress common.Address, amount *big.Int) error { + tokenABI := `[ + { + "name": "approve", + "type": "function", + "inputs": [ + { + "name": "spender", + "type": "address" + }, + { + "name": "value", + "type": "uint256" + } + ], + "outputs": [ + { + "name": "", + "type": "bool" + } + ] + } + ]` + parsedABI, err := abi.JSON(strings.NewReader(tokenABI)) + if err != nil { + return err + } + + approveData, err := parsedABI.Pack("approve", spenderAddress, amount) + if err != nil { + return err + } + nonce, err := uc.ethClient.PendingNonceAt(context.Background(), uc.signerAddress) + if err != nil { + return err + } + gasPrice, err := uc.ethClient.SuggestGasPrice(context.Background()) + if err != nil { + return err + } + gasLimit, err := uc.ethClient.EstimateGas(context.Background(), ethereum.CallMsg{ + To: &tokenAddress, + Data: approveData, + }) + if err != nil { + return err + } + gasLimit += uc.cfg.GasLimitBuffer + tx := types.NewTransaction(nonce, tokenAddress, big.NewInt(0), gasLimit, gasPrice, approveData) + return uc.sendTransaction(tx) +} + +func (uc *Client) SwapTokens(amountIn, amountOutMin *big.Int, path []common.Address) error { + log.Println("Swapping tokens...") + routerABI := `[ + { + "name": "swapExactTokensForTokens", + "type": "function", + "inputs": [ + { + "name": "amountIn", + "type": "uint256" + }, + { + "name": "amountOutMin", + "type": "uint256" + }, + { + "name": "path", + "type": "address[]" + }, + { + "name": "to", + "type": "address" + }, + { + "name": "deadline", + "type": "uint256" + } + ] + } + ]` + parsedRouterABI, err := abi.JSON(strings.NewReader(routerABI)) + if err != nil { + return err + } + + deadline := big.NewInt(time.Now().Add(uc.cfg.DeadlineDuration).Unix()) + + swapData, err := parsedRouterABI.Pack("swapExactTokensForTokens", amountIn, amountOutMin, path, uc.signerAddress, deadline) + if err != nil { + return err + } + nonce, err := uc.ethClient.PendingNonceAt(context.Background(), uc.signerAddress) + if err != nil { + return err + } + gasPrice, err := uc.ethClient.SuggestGasPrice(context.Background()) + if err != nil { + return err + } + tx := types.NewTransaction(nonce, uc.routerAddress, big.NewInt(0), uc.cfg.SwapGasLimit, gasPrice, swapData) + return uc.sendTransaction(tx) +} + +func (uc *Client) GetTokenBalance(tokenAddress common.Address) (*big.Int, error) { + tokenABI := `[ + { + "name": "balanceOf", + "type": "function", + "inputs": [ + { + "name": "account", + "type": "address" + } + ], + "outputs": [ + { + "name": "", + "type": "uint256" + } + ] + } + ]` + parsedABI, err := abi.JSON(strings.NewReader(tokenABI)) + if err != nil { + return nil, err + } + callData, err := parsedABI.Pack("balanceOf", uc.signerAddress) + if err != nil { + return nil, err + } + + msg := ethereum.CallMsg{ + To: &tokenAddress, + Data: callData, + } + + result, err := uc.ethClient.CallContract(context.Background(), msg, nil) + if err != nil { + return nil, err + } + + balance := new(big.Int) + balance.SetBytes(result) + return balance, nil +} + +func (uc *Client) GetExpectedAmountOut(amountIn *big.Int, path []common.Address) (*big.Int, error) { + routerABI := `[ + { + "name": "getAmountsOut", + "type": "function", + "inputs": [ + { + "name": "amountIn", + "type": "uint256" + }, + { + "name": "path", + "type": "address[]" + } + ], + "outputs": [ + { + "name": "", + "type": "uint256[]" + } + ] + } + ]` + parsedABI, err := abi.JSON(strings.NewReader(routerABI)) + if err != nil { + return nil, err + } + + callData, err := parsedABI.Pack("getAmountsOut", amountIn, path) + if err != nil { + return nil, err + } + + msg := ethereum.CallMsg{ + To: &uc.routerAddress, + Data: callData, + } + + result, err := uc.ethClient.CallContract(context.Background(), msg, nil) + if err != nil { + return nil, err + } + + var amountsOut []*big.Int + err = parsedABI.UnpackIntoInterface(&amountsOut, "getAmountsOut", result) + if err != nil { + return nil, err + } + + if len(amountsOut) < 2 { + return nil, fmt.Errorf("unexpected result length") + } + + return amountsOut[len(amountsOut)-1], nil +} + +func (uc *Client) sendTransaction(tx *types.Transaction) error { + chainID, err := uc.ethClient.NetworkID(context.Background()) + if err != nil { + return err + } + signedTx, err := types.SignTx(tx, types.NewEIP155Signer(chainID), uc.signerPrivateKey) + if err != nil { + return err + } + err = uc.ethClient.SendTransaction(context.Background(), signedTx) + if err != nil { + return err + } + log.Printf("Transaction sent: %s", signedTx.Hash().Hex()) + + receipt, err := bind.WaitMined(context.Background(), uc.ethClient, signedTx) + if err != nil { + return err + } + log.Printf("Transaction receipt status: %v", receipt.Status) + return nil +} + +func (uc *Client) CalculateAmountOutMin(expectedAmountOut *big.Int, slippagePercentage float64) *big.Int { + slippageFactor := big.NewFloat(1 - slippagePercentage/100) + expectedAmountOutFloat := new(big.Float).SetInt(expectedAmountOut) + amountOutMinFloat := new(big.Float).Mul(expectedAmountOutFloat, slippageFactor) + amountOutMin, _ := amountOutMinFloat.Int(nil) + return amountOutMin +} diff --git a/uniswap/util.go b/uniswap/util.go new file mode 100644 index 0000000..7b4a511 --- /dev/null +++ b/uniswap/util.go @@ -0,0 +1,22 @@ +package uniswap + +import ( + "crypto/ecdsa" + "fmt" + + "github.com/ethereum/go-ethereum/common" + "github.com/ethereum/go-ethereum/crypto" +) + +func privateKeyAndAddress(hexPrivateKey string) (*ecdsa.PrivateKey, common.Address, error) { + if hexPrivateKey == "" { + return nil, common.Address{}, fmt.Errorf("private key is not set") + } + privateKey, err := crypto.HexToECDSA(hexPrivateKey) + if err != nil { + return nil, common.Address{}, fmt.Errorf("failed to get private key: %v", err) + } + publicKey := privateKey.Public().(*ecdsa.PublicKey) + address := crypto.PubkeyToAddress(*publicKey) + return privateKey, address, nil +}