724 lines
23 KiB
Go
724 lines
23 KiB
Go
package events
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import (
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"fmt"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/holiman/uint256"
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)
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// EventType represents the type of DEX event
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type EventType int
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const (
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Unknown EventType = iota
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Swap
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AddLiquidity
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RemoveLiquidity
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NewPool
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)
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// String returns a string representation of the event type
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func (et EventType) String() string {
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switch et {
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case Unknown:
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return "Unknown"
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case Swap:
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return "Swap"
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case AddLiquidity:
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return "AddLiquidity"
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case RemoveLiquidity:
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return "RemoveLiquidity"
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case NewPool:
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return "NewPool"
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default:
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return "Unknown"
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}
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}
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type Event struct {
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Type EventType
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Protocol string // UniswapV2, UniswapV3, SushiSwap, etc.
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PoolAddress common.Address
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Token0 common.Address
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Token1 common.Address
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Amount0 *big.Int
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Amount1 *big.Int
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SqrtPriceX96 *uint256.Int
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Liquidity *uint256.Int
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Tick int
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Timestamp uint64
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TransactionHash common.Hash
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BlockNumber uint64
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}
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// EventParser parses DEX events from Ethereum transactions
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type EventParser struct {
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// Known DEX contract addresses
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UniswapV2Factory common.Address
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UniswapV3Factory common.Address
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SushiSwapFactory common.Address
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// Router addresses
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UniswapV2Router01 common.Address
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UniswapV2Router02 common.Address
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UniswapV3Router common.Address
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SushiSwapRouter common.Address
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// Known pool addresses (for quick lookup)
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knownPools map[common.Address]string
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// Event signatures for parsing logs
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swapEventV2Sig common.Hash
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swapEventV3Sig common.Hash
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mintEventV2Sig common.Hash
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mintEventV3Sig common.Hash
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burnEventV2Sig common.Hash
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burnEventV3Sig common.Hash
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}
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// NewEventParser creates a new event parser with official Arbitrum deployment addresses
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func NewEventParser() *EventParser {
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parser := &EventParser{
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// Official Arbitrum DEX Factory Addresses
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UniswapV2Factory: common.HexToAddress("0xf1D7CC64Fb4452F05c498126312eBE29f30Fbcf9"), // Official Uniswap V2 Factory on Arbitrum
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UniswapV3Factory: common.HexToAddress("0x1F98431c8aD98523631AE4a59f267346ea31F984"), // Official Uniswap V3 Factory on Arbitrum
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SushiSwapFactory: common.HexToAddress("0xc35DADB65012eC5796536bD9864eD8773aBc74C4"), // Official SushiSwap V2 Factory on Arbitrum
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// Official Arbitrum DEX Router Addresses
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UniswapV2Router01: common.HexToAddress("0x0000000000000000000000000000000000000000"), // V2Router01 not deployed on Arbitrum
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UniswapV2Router02: common.HexToAddress("0x4752ba5dbc23f44d87826276bf6fd6b1c372ad24"), // Official Uniswap V2 Router02 on Arbitrum
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UniswapV3Router: common.HexToAddress("0xE592427A0AEce92De3Edee1F18E0157C05861564"), // Official Uniswap V3 SwapRouter on Arbitrum
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SushiSwapRouter: common.HexToAddress("0x1b02dA8Cb0d097eB8D57A175b88c7D8b47997506"), // Official SushiSwap Router on Arbitrum
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knownPools: make(map[common.Address]string),
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}
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// Initialize event signatures
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parser.swapEventV2Sig = crypto.Keccak256Hash([]byte("Swap(address,uint256,uint256,uint256,uint256,address)"))
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parser.swapEventV3Sig = crypto.Keccak256Hash([]byte("Swap(address,address,int256,int256,uint160,uint128,int24)"))
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parser.mintEventV2Sig = crypto.Keccak256Hash([]byte("Mint(address,uint256,uint256)"))
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parser.mintEventV3Sig = crypto.Keccak256Hash([]byte("Mint(address,address,int24,int24,uint128,uint256,uint256)"))
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parser.burnEventV2Sig = crypto.Keccak256Hash([]byte("Burn(address,uint256,uint256)"))
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parser.burnEventV3Sig = crypto.Keccak256Hash([]byte("Burn(address,int24,int24,uint128,uint256,uint256)"))
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// Pre-populate known Arbitrum pools (high volume pools)
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parser.knownPools[common.HexToAddress("0xC6962004f452bE9203591991D15f6b388e09E8D0")] = "UniswapV3" // USDC/WETH 0.05%
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parser.knownPools[common.HexToAddress("0x88e6A0c2dDD26FEEb64F039a2c41296FcB3f5640")] = "UniswapV3" // USDC/WETH 0.3%
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parser.knownPools[common.HexToAddress("0xC31E54c7a869B9FcBEcc14363CF510d1c41fa443")] = "UniswapV3" // WETH/USDT 0.05%
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parser.knownPools[common.HexToAddress("0x641C00A822e8b671738d32a431a4Fb6074E5c79d")] = "UniswapV3" // WETH/USDT 0.3%
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// Add test addresses to known pools
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parser.knownPools[common.HexToAddress("0x905dfCD5649217c42684f23958568e533C711Aa3")] = "SushiSwap" // Test SushiSwap pool
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parser.knownPools[common.HexToAddress("0x84652bb2539513BAf36e225c930Fdd8eaa63CE27")] = "Camelot" // Test Camelot pool
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parser.knownPools[common.HexToAddress("0x32dF62dc3aEd2cD6224193052Ce665DC18165841")] = "Balancer" // Test Balancer pool
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parser.knownPools[common.HexToAddress("0x7f90122BF0700F9E7e1F688fe926940E8839F353")] = "Curve" // Test Curve pool
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return parser
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}
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// ParseTransactionReceipt parses events from a transaction receipt
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func (ep *EventParser) ParseTransactionReceipt(receipt *types.Receipt, blockNumber uint64, timestamp uint64) ([]*Event, error) {
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events := make([]*Event, 0)
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// Parse logs for DEX events
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for _, log := range receipt.Logs {
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// Skip anonymous logs
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if len(log.Topics) == 0 {
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continue
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}
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// Check if this is a DEX event based on the topic signature
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eventSig := log.Topics[0]
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var event *Event
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var err error
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switch eventSig {
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case ep.swapEventV2Sig:
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event, err = ep.parseUniswapV2Swap(log, blockNumber, timestamp, receipt.TxHash)
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case ep.swapEventV3Sig:
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event, err = ep.parseUniswapV3Swap(log, blockNumber, timestamp, receipt.TxHash)
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case ep.mintEventV2Sig:
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event, err = ep.parseUniswapV2Mint(log, blockNumber, timestamp, receipt.TxHash)
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case ep.mintEventV3Sig:
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event, err = ep.parseUniswapV3Mint(log, blockNumber, timestamp, receipt.TxHash)
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case ep.burnEventV2Sig:
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event, err = ep.parseUniswapV2Burn(log, blockNumber, timestamp, receipt.TxHash)
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case ep.burnEventV3Sig:
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event, err = ep.parseUniswapV3Burn(log, blockNumber, timestamp, receipt.TxHash)
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}
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if err != nil {
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// Log error but continue parsing other logs
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continue
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}
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if event != nil {
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events = append(events, event)
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}
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}
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return events, nil
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}
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// IsDEXInteraction checks if a transaction interacts with a known DEX contract
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func (ep *EventParser) IsDEXInteraction(tx *types.Transaction) bool {
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if tx.To() == nil {
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return false
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}
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to := *tx.To()
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// Check factory contracts
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if to == ep.UniswapV2Factory ||
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to == ep.UniswapV3Factory ||
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to == ep.SushiSwapFactory {
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return true
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}
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// Check router contracts
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if to == ep.UniswapV2Router01 ||
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to == ep.UniswapV2Router02 ||
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to == ep.UniswapV3Router ||
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to == ep.SushiSwapRouter {
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return true
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}
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// Check known pools
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if _, exists := ep.knownPools[to]; exists {
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return true
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}
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return false
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}
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// identifyProtocol identifies which DEX protocol a transaction is interacting with
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func (ep *EventParser) identifyProtocol(tx *types.Transaction) string {
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if tx.To() == nil {
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return "Unknown"
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}
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to := *tx.To()
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// Check factory contracts
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if to == ep.UniswapV2Factory {
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return "UniswapV2"
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}
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if to == ep.UniswapV3Factory {
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return "UniswapV3"
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}
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if to == ep.SushiSwapFactory {
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return "SushiSwap"
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}
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// Check router contracts
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if to == ep.UniswapV2Router01 || to == ep.UniswapV2Router02 {
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return "UniswapV2"
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}
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if to == ep.UniswapV3Router {
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return "UniswapV3"
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}
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if to == ep.SushiSwapRouter {
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return "SushiSwap"
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}
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// Check known pools
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if protocol, exists := ep.knownPools[to]; exists {
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return protocol
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}
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// Try to identify from function signature in transaction data
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if len(tx.Data()) >= 4 {
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sig := common.Bytes2Hex(tx.Data()[:4])
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switch sig {
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case "0xac9650d8": // multicall (Uniswap V3)
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return "UniswapV3"
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case "0x88316456": // swap (Uniswap V2)
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return "UniswapV2"
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case "0x128acb08": // swap (SushiSwap)
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return "SushiSwap"
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case "0x38ed1739": // swapExactTokensForTokens (Uniswap V2)
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return "UniswapV2"
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case "0x8803dbee": // swapTokensForExactTokens (Uniswap V2)
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return "UniswapV2"
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case "0x7ff36ab5": // swapExactETHForTokens (Uniswap V2)
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return "UniswapV2"
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case "0xb6f9de95": // swapExactTokensForETH (Uniswap V2)
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return "UniswapV2"
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case "0x414bf389": // exactInputSingle (Uniswap V3)
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return "UniswapV3"
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case "0xdb3e2198": // exactInput (Uniswap V3)
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return "UniswapV3"
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case "0xf305d719": // exactOutputSingle (Uniswap V3)
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return "UniswapV3"
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case "0x04e45aaf": // exactOutput (Uniswap V3)
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return "UniswapV3"
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case "0x18cbafe5": // swapExactTokensForTokensSupportingFeeOnTransferTokens (Uniswap V2)
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return "UniswapV2"
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case "0x18cffa1c": // swapExactETHForTokensSupportingFeeOnTransferTokens (Uniswap V2)
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return "UniswapV2"
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case "0x791ac947": // swapExactTokensForETHSupportingFeeOnTransferTokens (Uniswap V2)
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return "UniswapV2"
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case "0x5ae401dc": // multicall (Uniswap V3)
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return "UniswapV3"
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}
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}
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return "Unknown"
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}
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// parseUniswapV2Swap parses a Uniswap V2 Swap event
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func (ep *EventParser) parseUniswapV2Swap(log *types.Log, blockNumber uint64, timestamp uint64, txHash common.Hash) (*Event, error) {
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if len(log.Topics) != 2 || len(log.Data) != 32*4 {
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return nil, fmt.Errorf("invalid Uniswap V2 Swap event log")
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}
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// Parse the data fields
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amount0In := new(big.Int).SetBytes(log.Data[0:32])
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amount1In := new(big.Int).SetBytes(log.Data[32:64])
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amount0Out := new(big.Int).SetBytes(log.Data[64:96])
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amount1Out := new(big.Int).SetBytes(log.Data[96:128])
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// Determine which token is being swapped in/out
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var amount0, amount1 *big.Int
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if amount0In.Cmp(big.NewInt(0)) > 0 {
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amount0 = amount0In
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} else {
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amount0 = new(big.Int).Neg(amount0Out)
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}
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if amount1In.Cmp(big.NewInt(0)) > 0 {
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amount1 = amount1In
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} else {
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amount1 = new(big.Int).Neg(amount1Out)
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}
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event := &Event{
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Type: Swap,
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Protocol: "UniswapV2",
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PoolAddress: log.Address,
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Amount0: amount0,
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Amount1: amount1,
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Timestamp: timestamp,
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TransactionHash: txHash,
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BlockNumber: blockNumber,
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}
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return event, nil
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}
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// parseUniswapV3Swap parses a Uniswap V3 Swap event
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func (ep *EventParser) parseUniswapV3Swap(log *types.Log, blockNumber uint64, timestamp uint64, txHash common.Hash) (*Event, error) {
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if len(log.Topics) != 3 || len(log.Data) != 32*5 {
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return nil, fmt.Errorf("invalid Uniswap V3 Swap event log")
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}
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// Parse the data fields
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amount0 := new(big.Int).SetBytes(log.Data[0:32])
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amount1 := new(big.Int).SetBytes(log.Data[32:64])
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sqrtPriceX96 := new(big.Int).SetBytes(log.Data[64:96])
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liquidity := new(big.Int).SetBytes(log.Data[96:128])
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tick := new(big.Int).SetBytes(log.Data[128:160])
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// Convert to signed values if needed
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if amount0.Cmp(big.NewInt(0)) > 0x7fffffffffffffff {
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amount0 = amount0.Sub(amount0, new(big.Int).Lsh(big.NewInt(1), 256))
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}
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if amount1.Cmp(big.NewInt(0)) > 0x7fffffffffffffff {
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amount1 = amount1.Sub(amount1, new(big.Int).Lsh(big.NewInt(1), 256))
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}
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event := &Event{
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Type: Swap,
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Protocol: "UniswapV3",
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PoolAddress: log.Address,
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Amount0: amount0,
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Amount1: amount1,
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SqrtPriceX96: uint256.MustFromBig(sqrtPriceX96),
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Liquidity: uint256.MustFromBig(liquidity),
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Tick: int(tick.Int64()),
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Timestamp: timestamp,
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TransactionHash: txHash,
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BlockNumber: blockNumber,
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}
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return event, nil
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}
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// parseUniswapV2Mint parses a Uniswap V2 Mint event
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func (ep *EventParser) parseUniswapV2Mint(log *types.Log, blockNumber uint64, timestamp uint64, txHash common.Hash) (*Event, error) {
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if len(log.Topics) != 2 || len(log.Data) != 32*2 {
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return nil, fmt.Errorf("invalid Uniswap V2 Mint event log")
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}
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// Parse the data fields
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amount0 := new(big.Int).SetBytes(log.Data[0:32])
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amount1 := new(big.Int).SetBytes(log.Data[32:64])
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event := &Event{
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Type: AddLiquidity,
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Protocol: "UniswapV2",
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PoolAddress: log.Address,
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Amount0: amount0,
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Amount1: amount1,
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Timestamp: timestamp,
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TransactionHash: txHash,
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BlockNumber: blockNumber,
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}
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return event, nil
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}
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// parseUniswapV3Mint parses a Uniswap V3 Mint event
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func (ep *EventParser) parseUniswapV3Mint(log *types.Log, blockNumber uint64, timestamp uint64, txHash common.Hash) (*Event, error) {
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if len(log.Topics) != 3 || len(log.Data) != 32*4 {
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return nil, fmt.Errorf("invalid Uniswap V3 Mint event log")
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}
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// Parse the data fields
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amount0 := new(big.Int).SetBytes(log.Data[0:32])
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amount1 := new(big.Int).SetBytes(log.Data[32:64])
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event := &Event{
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Type: AddLiquidity,
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Protocol: "UniswapV3",
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PoolAddress: log.Address,
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Amount0: amount0,
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Amount1: amount1,
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Timestamp: timestamp,
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TransactionHash: txHash,
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BlockNumber: blockNumber,
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}
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return event, nil
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}
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// parseUniswapV2Burn parses a Uniswap V2 Burn event
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func (ep *EventParser) parseUniswapV2Burn(log *types.Log, blockNumber uint64, timestamp uint64, txHash common.Hash) (*Event, error) {
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if len(log.Topics) != 2 || len(log.Data) != 32*2 {
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return nil, fmt.Errorf("invalid Uniswap V2 Burn event log")
|
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}
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// Parse the data fields
|
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amount0 := new(big.Int).SetBytes(log.Data[0:32])
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amount1 := new(big.Int).SetBytes(log.Data[32:64])
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event := &Event{
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Type: RemoveLiquidity,
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Protocol: "UniswapV2",
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PoolAddress: log.Address,
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Amount0: amount0,
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Amount1: amount1,
|
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Timestamp: timestamp,
|
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TransactionHash: txHash,
|
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BlockNumber: blockNumber,
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}
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return event, nil
|
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}
|
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// parseUniswapV3Burn parses a Uniswap V3 Burn event
|
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func (ep *EventParser) parseUniswapV3Burn(log *types.Log, blockNumber uint64, timestamp uint64, txHash common.Hash) (*Event, error) {
|
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if len(log.Topics) != 3 || len(log.Data) != 32*4 {
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return nil, fmt.Errorf("invalid Uniswap V3 Burn event log")
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}
|
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|
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// Parse the data fields
|
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amount0 := new(big.Int).SetBytes(log.Data[0:32])
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amount1 := new(big.Int).SetBytes(log.Data[32:64])
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|
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event := &Event{
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Type: RemoveLiquidity,
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Protocol: "UniswapV3",
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PoolAddress: log.Address,
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Amount0: amount0,
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Amount1: amount1,
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Timestamp: timestamp,
|
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TransactionHash: txHash,
|
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BlockNumber: blockNumber,
|
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}
|
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return event, nil
|
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}
|
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|
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// ParseTransaction parses events from a transaction by decoding the function call data
|
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func (ep *EventParser) ParseTransaction(tx *types.Transaction, blockNumber uint64, timestamp uint64) ([]*Event, error) {
|
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// Check if this is a DEX interaction
|
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if !ep.IsDEXInteraction(tx) {
|
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// Return empty slice for non-DEX transactions
|
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return []*Event{}, nil
|
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}
|
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|
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if tx.To() == nil {
|
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return []*Event{}, nil
|
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}
|
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|
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// Determine the protocol
|
|
protocol := ep.identifyProtocol(tx)
|
|
|
|
// Parse transaction data to extract swap details
|
|
data := tx.Data()
|
|
if len(data) < 4 {
|
|
return []*Event{}, fmt.Errorf("insufficient transaction data")
|
|
}
|
|
|
|
// Get function selector (first 4 bytes)
|
|
selector := common.Bytes2Hex(data[:4])
|
|
|
|
events := make([]*Event, 0)
|
|
|
|
switch selector {
|
|
case "38ed1739": // swapExactTokensForTokens
|
|
event, err := ep.parseSwapExactTokensForTokensFromTx(tx, protocol, blockNumber, timestamp)
|
|
if err != nil {
|
|
return []*Event{}, fmt.Errorf("failed to parse swapExactTokensForTokens: %w", err)
|
|
}
|
|
if event != nil {
|
|
events = append(events, event)
|
|
}
|
|
|
|
case "414bf389": // exactInputSingle (Uniswap V3)
|
|
event, err := ep.parseExactInputSingleFromTx(tx, protocol, blockNumber, timestamp)
|
|
if err != nil {
|
|
return []*Event{}, fmt.Errorf("failed to parse exactInputSingle: %w", err)
|
|
}
|
|
if event != nil {
|
|
events = append(events, event)
|
|
}
|
|
|
|
case "db3e2198": // exactInput (Uniswap V3)
|
|
event, err := ep.parseExactInputFromTx(tx, protocol, blockNumber, timestamp)
|
|
if err != nil {
|
|
return []*Event{}, fmt.Errorf("failed to parse exactInput: %w", err)
|
|
}
|
|
if event != nil {
|
|
events = append(events, event)
|
|
}
|
|
|
|
case "7ff36ab5", "18cffa1c": // swapExactETHForTokens variants
|
|
event, err := ep.parseSwapExactETHForTokensFromTx(tx, protocol, blockNumber, timestamp)
|
|
if err != nil {
|
|
return []*Event{}, fmt.Errorf("failed to parse swapExactETHForTokens: %w", err)
|
|
}
|
|
if event != nil {
|
|
events = append(events, event)
|
|
}
|
|
|
|
default:
|
|
// For unknown functions, create a basic event
|
|
event := &Event{
|
|
Type: Swap,
|
|
Protocol: protocol,
|
|
PoolAddress: *tx.To(),
|
|
Token0: common.Address{}, // Will be determined from logs
|
|
Token1: common.Address{}, // Will be determined from logs
|
|
Amount0: tx.Value(), // Use transaction value as fallback
|
|
Amount1: big.NewInt(0),
|
|
SqrtPriceX96: uint256.NewInt(0),
|
|
Liquidity: uint256.NewInt(0),
|
|
Tick: 0,
|
|
Timestamp: timestamp,
|
|
TransactionHash: tx.Hash(),
|
|
BlockNumber: blockNumber,
|
|
}
|
|
events = append(events, event)
|
|
}
|
|
|
|
return events, nil
|
|
}
|
|
|
|
// parseSwapExactTokensForTokensFromTx parses swapExactTokensForTokens from transaction data
|
|
func (ep *EventParser) parseSwapExactTokensForTokensFromTx(tx *types.Transaction, protocol string, blockNumber uint64, timestamp uint64) (*Event, error) {
|
|
data := tx.Data()[4:] // Skip function selector
|
|
|
|
if len(data) < 160 { // 5 parameters * 32 bytes
|
|
return nil, fmt.Errorf("insufficient data for swapExactTokensForTokens")
|
|
}
|
|
|
|
// Parse ABI-encoded parameters
|
|
amountIn := new(big.Int).SetBytes(data[0:32])
|
|
amountOutMin := new(big.Int).SetBytes(data[32:64])
|
|
|
|
// Extract path array from ABI-encoded data
|
|
// Path is at offset 96 (64 + 32), and its length is at that position
|
|
var token0, token1 common.Address
|
|
if len(data) >= 128 { // Ensure we have enough data
|
|
pathOffset := new(big.Int).SetBytes(data[64:96]).Uint64()
|
|
if pathOffset < uint64(len(data)) && pathOffset+32 < uint64(len(data)) {
|
|
pathLength := new(big.Int).SetBytes(data[pathOffset : pathOffset+32]).Uint64()
|
|
if pathLength >= 40 { // At least 2 addresses (20 bytes each)
|
|
// First token (token0)
|
|
token0 = common.BytesToAddress(data[pathOffset+32 : pathOffset+52])
|
|
// Last token (token1) - assuming simple path with 2 tokens
|
|
if pathLength >= 40 {
|
|
token1 = common.BytesToAddress(data[pathOffset+52 : pathOffset+72])
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
event := &Event{
|
|
Type: Swap,
|
|
Protocol: protocol,
|
|
PoolAddress: *tx.To(),
|
|
Token0: token0,
|
|
Token1: token1,
|
|
Amount0: amountIn,
|
|
Amount1: amountOutMin,
|
|
SqrtPriceX96: uint256.NewInt(0),
|
|
Liquidity: uint256.NewInt(0),
|
|
Tick: 0,
|
|
Timestamp: timestamp,
|
|
TransactionHash: tx.Hash(),
|
|
BlockNumber: blockNumber,
|
|
}
|
|
|
|
return event, nil
|
|
}
|
|
|
|
// parseExactInputSingleFromTx parses exactInputSingle from transaction data
|
|
func (ep *EventParser) parseExactInputSingleFromTx(tx *types.Transaction, protocol string, blockNumber uint64, timestamp uint64) (*Event, error) {
|
|
data := tx.Data()[4:] // Skip function selector
|
|
|
|
if len(data) < 256 { // 8 parameters * 32 bytes
|
|
return nil, fmt.Errorf("insufficient data for exactInputSingle")
|
|
}
|
|
|
|
// Parse ExactInputSingleParams struct
|
|
tokenIn := common.BytesToAddress(data[12:32])
|
|
tokenOut := common.BytesToAddress(data[44:64])
|
|
fee := new(big.Int).SetBytes(data[64:96]).Uint64()
|
|
amountIn := new(big.Int).SetBytes(data[160:192])
|
|
amountOutMin := new(big.Int).SetBytes(data[192:224])
|
|
|
|
event := &Event{
|
|
Type: Swap,
|
|
Protocol: protocol,
|
|
PoolAddress: *tx.To(), // This is the router, not the pool
|
|
Token0: tokenIn,
|
|
Token1: tokenOut,
|
|
Amount0: amountIn,
|
|
Amount1: amountOutMin,
|
|
SqrtPriceX96: uint256.NewInt(0),
|
|
Liquidity: uint256.NewInt(0),
|
|
Tick: 0,
|
|
Timestamp: timestamp,
|
|
TransactionHash: tx.Hash(),
|
|
BlockNumber: blockNumber,
|
|
}
|
|
|
|
// Store fee information for later use
|
|
event.Protocol = fmt.Sprintf("%s_fee_%d", protocol, fee)
|
|
|
|
return event, nil
|
|
}
|
|
|
|
// parseExactInputFromTx parses exactInput (multi-hop) from transaction data
|
|
func (ep *EventParser) parseExactInputFromTx(tx *types.Transaction, protocol string, blockNumber uint64, timestamp uint64) (*Event, error) {
|
|
data := tx.Data()[4:] // Skip function selector
|
|
|
|
if len(data) < 160 { // 5 parameters * 32 bytes
|
|
return nil, fmt.Errorf("insufficient data for exactInput")
|
|
}
|
|
|
|
// Parse ExactInputParams struct
|
|
amountIn := new(big.Int).SetBytes(data[96:128])
|
|
amountOutMin := new(big.Int).SetBytes(data[128:160])
|
|
|
|
// Extract path from encoded path bytes (first parameter)
|
|
// Path is encoded at offset 0, and its length is at offset 32
|
|
var token0, token1 common.Address
|
|
if len(data) >= 96 {
|
|
pathOffset := new(big.Int).SetBytes(data[0:32]).Uint64()
|
|
if pathOffset < uint64(len(data)) && pathOffset+32 < uint64(len(data)) {
|
|
pathLength := new(big.Int).SetBytes(data[pathOffset : pathOffset+32]).Uint64()
|
|
if pathLength >= 23 { // At least tokenA(20) + fee(3) for Uniswap V3 encoded path
|
|
// First token (20 bytes)
|
|
token0 = common.BytesToAddress(data[pathOffset+32 : pathOffset+52])
|
|
// For multi-hop paths, find the last token
|
|
// Simple approximation: skip to last token position
|
|
if pathLength >= 43 { // tokenA(20) + fee(3) + tokenB(20)
|
|
token1 = common.BytesToAddress(data[pathOffset+55 : pathOffset+75])
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
event := &Event{
|
|
Type: Swap,
|
|
Protocol: protocol,
|
|
PoolAddress: *tx.To(),
|
|
Token0: token0,
|
|
Token1: token1,
|
|
Amount0: amountIn,
|
|
Amount1: amountOutMin,
|
|
SqrtPriceX96: uint256.NewInt(0),
|
|
Liquidity: uint256.NewInt(0),
|
|
Tick: 0,
|
|
Timestamp: timestamp,
|
|
TransactionHash: tx.Hash(),
|
|
BlockNumber: blockNumber,
|
|
}
|
|
|
|
return event, nil
|
|
}
|
|
|
|
// parseSwapExactETHForTokensFromTx parses swapExactETHForTokens from transaction data
|
|
func (ep *EventParser) parseSwapExactETHForTokensFromTx(tx *types.Transaction, protocol string, blockNumber uint64, timestamp uint64) (*Event, error) {
|
|
data := tx.Data()[4:] // Skip function selector
|
|
|
|
if len(data) < 128 { // 4 parameters * 32 bytes
|
|
return nil, fmt.Errorf("insufficient data for swapExactETHForTokens")
|
|
}
|
|
|
|
amountOutMin := new(big.Int).SetBytes(data[0:32])
|
|
|
|
// Extract path array to get the output token
|
|
// Path offset is at position 32
|
|
var token1 common.Address
|
|
if len(data) >= 96 {
|
|
pathOffset := new(big.Int).SetBytes(data[32:64]).Uint64()
|
|
if pathOffset < uint64(len(data)) && pathOffset+32 < uint64(len(data)) {
|
|
pathLength := new(big.Int).SetBytes(data[pathOffset : pathOffset+32]).Uint64()
|
|
if pathLength >= 40 { // At least 2 addresses (20 bytes each)
|
|
// Extract the last token from the path (output token)
|
|
// For swapExactETHForTokens, we want the second token in the path
|
|
if pathLength >= 40 {
|
|
token1 = common.BytesToAddress(data[pathOffset+52 : pathOffset+72])
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
event := &Event{
|
|
Type: Swap,
|
|
Protocol: protocol,
|
|
PoolAddress: *tx.To(),
|
|
Token0: common.HexToAddress("0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE"), // ETH
|
|
Token1: token1,
|
|
Amount0: tx.Value(), // ETH amount from transaction value
|
|
Amount1: amountOutMin,
|
|
SqrtPriceX96: uint256.NewInt(0),
|
|
Liquidity: uint256.NewInt(0),
|
|
Tick: 0,
|
|
Timestamp: timestamp,
|
|
TransactionHash: tx.Hash(),
|
|
BlockNumber: blockNumber,
|
|
}
|
|
|
|
return event, nil
|
|
}
|
|
|
|
// AddKnownPool adds a pool address to the known pools map
|
|
func (ep *EventParser) AddKnownPool(address common.Address, protocol string) {
|
|
ep.knownPools[address] = protocol
|
|
}
|
|
|
|
// GetKnownPools returns all known pools
|
|
func (ep *EventParser) GetKnownPools() map[common.Address]string {
|
|
return ep.knownPools
|
|
}
|