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**Curve StableSwap Parser** (`curve.go`): - TokenExchange event parsing (address,int128,uint256,int128,uint256) - TokenExchangeUnderlying event support for wrapped tokens - Coin index (int128) to token address mapping - Handles 2-coin and multi-coin pools - Typical use: USDC/USDT, DAI/USDC stablecoin swaps - Low slippage due to amplification coefficient (A parameter) - Fee: typically 0.04% (4 basis points) **Key Features:** - Buyer address extraction from indexed topics - Coin ID to token mapping via pool cache - Both directions: token0→token1 and token1→token0 - Buyer is both sender and recipient (Curve pattern) - Support for 6-decimal stablecoins (USDC, USDT) **Testing** (`curve_test.go`): - TokenExchange and TokenExchangeUnderlying signature validation - Swap direction tests (USDC→USDT, USDT→USDC) - Multi-event receipts with mixed protocols - Decimal scaling validation (6 decimals → 18 decimals) - Pool not found error handling **Type System Fix:** - Exported ScaleToDecimals() function in pkg/types/pool.go - Updated all callers to use exported function - Fixed test function name (TestScaleToDecimals) - Consistent across all parsers (V2, V3, Curve) **Use Cases:** 1. Stablecoin arbitrage (Curve vs Uniswap pricing) 2. Low-slippage large swaps (Curve specialization) 3. Multi-coin pool support (3pool, 4pool) 4. Underlying vs wrapped token detection **Task:** P2-018 (Curve StableSwap parser) **Coverage:** 100% (enforced in CI/CD) **Protocol:** Curve StableSwap on Arbitrum 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
447 lines
11 KiB
Go
447 lines
11 KiB
Go
package parsers
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import (
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"context"
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"math/big"
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"testing"
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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/your-org/mev-bot/pkg/cache"
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mevtypes "github.com/your-org/mev-bot/pkg/types"
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)
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func TestNewCurveParser(t *testing.T) {
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cache := cache.NewPoolCache()
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logger := &mockLogger{}
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parser := NewCurveParser(cache, logger)
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if parser == nil {
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t.Fatal("NewCurveParser returned nil")
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}
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if parser.cache != cache {
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t.Error("NewCurveParser cache not set correctly")
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}
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if parser.logger != logger {
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t.Error("NewCurveParser logger not set correctly")
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}
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}
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func TestCurveParser_Protocol(t *testing.T) {
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parser := NewCurveParser(cache.NewPoolCache(), &mockLogger{})
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if parser.Protocol() != mevtypes.ProtocolCurve {
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t.Errorf("Protocol() = %v, want %v", parser.Protocol(), mevtypes.ProtocolCurve)
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}
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}
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func TestCurveParser_SupportsLog(t *testing.T) {
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parser := NewCurveParser(cache.NewPoolCache(), &mockLogger{})
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tests := []struct {
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name string
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log types.Log
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want bool
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}{
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{
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name: "valid TokenExchange event",
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log: types.Log{
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Topics: []common.Hash{CurveTokenExchangeSignature},
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},
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want: true,
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},
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{
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name: "valid TokenExchangeUnderlying event",
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log: types.Log{
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Topics: []common.Hash{CurveTokenExchangeUnderlyingSignature},
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},
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want: true,
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},
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{
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name: "empty topics",
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log: types.Log{
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Topics: []common.Hash{},
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},
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want: false,
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},
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{
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name: "wrong event signature",
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log: types.Log{
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Topics: []common.Hash{common.HexToHash("0x1234")},
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},
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want: false,
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},
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{
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name: "UniswapV2 event signature",
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log: types.Log{
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Topics: []common.Hash{SwapEventSignature},
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},
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want: false,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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if got := parser.SupportsLog(tt.log); got != tt.want {
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t.Errorf("SupportsLog() = %v, want %v", got, tt.want)
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}
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})
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}
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}
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func TestCurveParser_ParseLog(t *testing.T) {
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ctx := context.Background()
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// Create pool cache and add test pool
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poolCache := cache.NewPoolCache()
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poolAddress := common.HexToAddress("0x1111111111111111111111111111111111111111")
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token0 := common.HexToAddress("0x2222222222222222222222222222222222222222") // USDC
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token1 := common.HexToAddress("0x3333333333333333333333333333333333333333") // USDT
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testPool := &mevtypes.PoolInfo{
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Address: poolAddress,
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Protocol: mevtypes.ProtocolCurve,
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Token0: token0,
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Token1: token1,
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Token0Decimals: 6, // USDC
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Token1Decimals: 6, // USDT
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Reserve0: big.NewInt(1000000000000), // 1M USDC
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Reserve1: big.NewInt(1000000000000), // 1M USDT
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Fee: 4, // 0.04% typical Curve fee
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IsActive: true,
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AmpCoefficient: big.NewInt(2000), // Typical A parameter for stablecoin pools
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}
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err := poolCache.Add(ctx, testPool)
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if err != nil {
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t.Fatalf("Failed to add test pool: %v", err)
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}
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parser := NewCurveParser(poolCache, &mockLogger{})
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// Create test transaction
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tx := types.NewTransaction(
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0,
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poolAddress,
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big.NewInt(0),
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0,
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big.NewInt(0),
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[]byte{},
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)
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buyer := common.HexToAddress("0x4444444444444444444444444444444444444444")
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tests := []struct {
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name string
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soldID int128
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tokensSold *big.Int
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boughtID int128
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tokensBought *big.Int
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wantAmount0In *big.Int
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wantAmount1In *big.Int
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wantAmount0Out *big.Int
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wantAmount1Out *big.Int
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wantErr bool
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}{
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{
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name: "swap token0 for token1 (USDC → USDT)",
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soldID: 0,
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tokensSold: big.NewInt(1000000), // 1 USDC (6 decimals)
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boughtID: 1,
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tokensBought: big.NewInt(999500), // 0.9995 USDT (6 decimals)
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wantAmount0In: mevtypes.ScaleToDecimals(big.NewInt(1000000), 6, 18),
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wantAmount1In: big.NewInt(0),
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wantAmount0Out: big.NewInt(0),
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wantAmount1Out: mevtypes.ScaleToDecimals(big.NewInt(999500), 6, 18),
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wantErr: false,
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},
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{
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name: "swap token1 for token0 (USDT → USDC)",
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soldID: 1,
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tokensSold: big.NewInt(1000000), // 1 USDT (6 decimals)
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boughtID: 0,
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tokensBought: big.NewInt(999500), // 0.9995 USDC (6 decimals)
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wantAmount0In: big.NewInt(0),
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wantAmount1In: mevtypes.ScaleToDecimals(big.NewInt(1000000), 6, 18),
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wantAmount0Out: mevtypes.ScaleToDecimals(big.NewInt(999500), 6, 18),
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wantAmount1Out: big.NewInt(0),
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wantErr: false,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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// Encode event data: sold_id, tokens_sold, bought_id, tokens_bought
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data := make([]byte, 32*4) // 4 * 32 bytes
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// int128 sold_id
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soldIDBig := big.NewInt(int64(tt.soldID))
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soldIDBig.FillBytes(data[0:32])
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// uint256 tokens_sold
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tt.tokensSold.FillBytes(data[32:64])
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// int128 bought_id
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boughtIDBig := big.NewInt(int64(tt.boughtID))
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boughtIDBig.FillBytes(data[64:96])
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// uint256 tokens_bought
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tt.tokensBought.FillBytes(data[96:128])
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log := types.Log{
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Address: poolAddress,
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Topics: []common.Hash{
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CurveTokenExchangeSignature,
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common.BytesToHash(buyer.Bytes()),
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},
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Data: data,
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BlockNumber: 1000,
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Index: 0,
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}
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event, err := parser.ParseLog(ctx, log, tx)
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if tt.wantErr {
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if err == nil {
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t.Error("ParseLog() expected error, got nil")
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}
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return
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}
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if err != nil {
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t.Fatalf("ParseLog() unexpected error: %v", err)
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}
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if event == nil {
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t.Fatal("ParseLog() returned nil event")
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}
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// Verify event fields
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if event.TxHash != tx.Hash() {
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t.Errorf("TxHash = %v, want %v", event.TxHash, tx.Hash())
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}
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if event.Protocol != mevtypes.ProtocolCurve {
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t.Errorf("Protocol = %v, want %v", event.Protocol, mevtypes.ProtocolCurve)
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}
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if event.Amount0In.Cmp(tt.wantAmount0In) != 0 {
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t.Errorf("Amount0In = %v, want %v", event.Amount0In, tt.wantAmount0In)
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}
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if event.Amount1In.Cmp(tt.wantAmount1In) != 0 {
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t.Errorf("Amount1In = %v, want %v", event.Amount1In, tt.wantAmount1In)
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}
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if event.Amount0Out.Cmp(tt.wantAmount0Out) != 0 {
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t.Errorf("Amount0Out = %v, want %v", event.Amount0Out, tt.wantAmount0Out)
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}
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if event.Amount1Out.Cmp(tt.wantAmount1Out) != 0 {
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t.Errorf("Amount1Out = %v, want %v", event.Amount1Out, tt.wantAmount1Out)
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}
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if event.Sender != buyer {
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t.Errorf("Sender = %v, want %v", event.Sender, buyer)
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}
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if event.Recipient != buyer {
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t.Errorf("Recipient = %v, want %v (Curve uses buyer for both)", event.Recipient, buyer)
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}
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})
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}
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}
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func TestCurveParser_ParseReceipt(t *testing.T) {
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ctx := context.Background()
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// Create pool cache and add test pool
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poolCache := cache.NewPoolCache()
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poolAddress := common.HexToAddress("0x1111111111111111111111111111111111111111")
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token0 := common.HexToAddress("0x2222222222222222222222222222222222222222")
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token1 := common.HexToAddress("0x3333333333333333333333333333333333333333")
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testPool := &mevtypes.PoolInfo{
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Address: poolAddress,
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Protocol: mevtypes.ProtocolCurve,
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Token0: token0,
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Token1: token1,
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Token0Decimals: 6,
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Token1Decimals: 6,
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Reserve0: big.NewInt(1000000000000),
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Reserve1: big.NewInt(1000000000000),
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Fee: 4,
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IsActive: true,
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AmpCoefficient: big.NewInt(2000),
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}
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err := poolCache.Add(ctx, testPool)
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if err != nil {
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t.Fatalf("Failed to add test pool: %v", err)
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}
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parser := NewCurveParser(poolCache, &mockLogger{})
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// Create test transaction
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tx := types.NewTransaction(
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0,
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poolAddress,
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big.NewInt(0),
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0,
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big.NewInt(0),
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[]byte{},
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)
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// Encode minimal valid event data
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soldID := big.NewInt(0)
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tokensSold := big.NewInt(1000000)
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boughtID := big.NewInt(1)
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tokensBought := big.NewInt(999500)
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data := make([]byte, 32*4)
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soldID.FillBytes(data[0:32])
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tokensSold.FillBytes(data[32:64])
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boughtID.FillBytes(data[64:96])
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tokensBought.FillBytes(data[96:128])
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buyer := common.HexToAddress("0x4444444444444444444444444444444444444444")
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tests := []struct {
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name string
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receipt *types.Receipt
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wantCount int
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}{
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{
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name: "receipt with single Curve swap event",
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receipt: &types.Receipt{
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Logs: []*types.Log{
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{
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Address: poolAddress,
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Topics: []common.Hash{
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CurveTokenExchangeSignature,
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common.BytesToHash(buyer.Bytes()),
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},
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Data: data,
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BlockNumber: 1000,
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Index: 0,
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},
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},
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},
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wantCount: 1,
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},
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{
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name: "receipt with multiple Curve swap events",
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receipt: &types.Receipt{
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Logs: []*types.Log{
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{
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Address: poolAddress,
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Topics: []common.Hash{
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CurveTokenExchangeSignature,
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common.BytesToHash(buyer.Bytes()),
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},
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Data: data,
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BlockNumber: 1000,
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Index: 0,
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},
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{
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Address: poolAddress,
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Topics: []common.Hash{
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CurveTokenExchangeUnderlyingSignature,
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common.BytesToHash(buyer.Bytes()),
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},
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Data: data,
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BlockNumber: 1000,
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Index: 1,
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},
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},
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},
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wantCount: 2,
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},
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{
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name: "receipt with mixed events",
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receipt: &types.Receipt{
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Logs: []*types.Log{
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{
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Address: poolAddress,
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Topics: []common.Hash{
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CurveTokenExchangeSignature,
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common.BytesToHash(buyer.Bytes()),
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},
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Data: data,
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BlockNumber: 1000,
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Index: 0,
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},
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{
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Address: poolAddress,
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Topics: []common.Hash{
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SwapEventSignature, // UniswapV2 signature
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common.BytesToHash(buyer.Bytes()),
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common.BytesToHash(buyer.Bytes()),
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},
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Data: []byte{},
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BlockNumber: 1000,
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Index: 1,
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},
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},
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},
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wantCount: 1, // Only the Curve event
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},
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{
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name: "empty receipt",
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receipt: &types.Receipt{
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Logs: []*types.Log{},
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},
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wantCount: 0,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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events, err := parser.ParseReceipt(ctx, tt.receipt, tx)
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if err != nil {
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t.Fatalf("ParseReceipt() unexpected error: %v", err)
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}
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if len(events) != tt.wantCount {
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t.Errorf("ParseReceipt() returned %d events, want %d", len(events), tt.wantCount)
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}
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// Verify all returned events are valid
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for i, event := range events {
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if event == nil {
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t.Errorf("Event %d is nil", i)
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continue
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}
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if event.Protocol != mevtypes.ProtocolCurve {
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t.Errorf("Event %d Protocol = %v, want %v", i, event.Protocol, mevtypes.ProtocolCurve)
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}
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}
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})
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}
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}
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func TestCurveTokenExchangeSignature(t *testing.T) {
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// Verify the event signature is correct
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expected := crypto.Keccak256Hash([]byte("TokenExchange(address,int128,uint256,int128,uint256)"))
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if CurveTokenExchangeSignature != expected {
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t.Errorf("CurveTokenExchangeSignature = %v, want %v", CurveTokenExchangeSignature, expected)
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}
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}
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func TestCurveTokenExchangeUnderlyingSignature(t *testing.T) {
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// Verify the underlying event signature is correct
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expected := crypto.Keccak256Hash([]byte("TokenExchangeUnderlying(address,int128,uint256,int128,uint256)"))
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if CurveTokenExchangeUnderlyingSignature != expected {
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t.Errorf("CurveTokenExchangeUnderlyingSignature = %v, want %v", CurveTokenExchangeUnderlyingSignature, expected)
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}
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}
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