feat(core): implement core MEV bot functionality with market scanning and Uniswap V3 pricing

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

pkg/validation/input_validator.go

@@ -13,10 +13,10 @@ import (
 // InputValidator provides comprehensive validation for external data
 type InputValidator struct {
 	// Regex patterns for validation
-	addressPattern    *regexp.Regexp
-	txHashPattern     *regexp.Regexp
-	blockHashPattern  *regexp.Regexp
-	hexDataPattern    *regexp.Regexp
+	addressPattern   *regexp.Regexp
+	txHashPattern    *regexp.Regexp
+	blockHashPattern *regexp.Regexp
+	hexDataPattern   *regexp.Regexp
 }
 
 // NewInputValidator creates a new input validator
@@ -45,16 +45,16 @@ func (v *InputValidator) ValidateAddress(address string) error {
 	if address == "" {
 		return &ValidationError{"address", address, "address cannot be empty"}
 	}
-	
+
 	if !v.addressPattern.MatchString(address) {
 		return &ValidationError{"address", address, "invalid address format"}
 	}
-	
+
 	// Additional validation: check for zero address
 	if address == "0x0000000000000000000000000000000000000000" {
 		return &ValidationError{"address", address, "zero address not allowed"}
 	}
-	
+
 	return nil
 }
 
@@ -68,11 +68,11 @@ func (v *InputValidator) ValidateTransactionHash(hash string) error {
 	if hash == "" {
 		return &ValidationError{"txHash", hash, "transaction hash cannot be empty"}
 	}
-	
+
 	if !v.txHashPattern.MatchString(hash) {
 		return &ValidationError{"txHash", hash, "invalid transaction hash format"}
 	}
-	
+
 	return nil
 }
 
@@ -81,11 +81,11 @@ func (v *InputValidator) ValidateBlockHash(hash string) error {
 	if hash == "" {
 		return &ValidationError{"blockHash", hash, "block hash cannot be empty"}
 	}
-	
+
 	if !v.blockHashPattern.MatchString(hash) {
 		return &ValidationError{"blockHash", hash, "invalid block hash format"}
 	}
-	
+
 	return nil
 }
 
@@ -94,11 +94,11 @@ func (v *InputValidator) ValidateHexData(data string) error {
 	if data == "" {
 		return nil // Empty data is valid
 	}
-	
+
 	if !v.hexDataPattern.MatchString(data) {
 		return &ValidationError{"hexData", data, "invalid hex data format"}
 	}
-	
+
 	return nil
 }
 
@@ -107,17 +107,17 @@ func (v *InputValidator) ValidateBigInt(value *big.Int, fieldName string) error
 	if value == nil {
 		return &ValidationError{fieldName, value, "value cannot be nil"}
 	}
-	
+
 	// Check for reasonable bounds to prevent overflow attacks
 	maxValue := new(big.Int).Exp(big.NewInt(10), big.NewInt(77), nil) // 10^77
 	if value.Cmp(maxValue) > 0 {
 		return &ValidationError{fieldName, value, "value exceeds maximum allowed"}
 	}
-	
+
 	if value.Sign() < 0 {
 		return &ValidationError{fieldName, value, "negative values not allowed"}
 	}
-	
+
 	return nil
 }
 
@@ -125,11 +125,11 @@ func (v *InputValidator) ValidateBigInt(value *big.Int, fieldName string) error
 func (v *InputValidator) ValidateBlockNumber(blockNumber uint64) error {
 	// Check for reasonable block number bounds
 	maxBlock := uint64(1000000000) // 1 billion - reasonable upper bound
-	
+
 	if blockNumber > maxBlock {
 		return &ValidationError{"blockNumber", blockNumber, "block number exceeds reasonable bounds"}
 	}
-	
+
 	return nil
 }
 
@@ -138,53 +138,53 @@ func (v *InputValidator) ValidateTransaction(tx *types.Transaction) error {
 	if tx == nil {
 		return &ValidationError{"transaction", tx, "transaction cannot be nil"}
 	}
-	
+
 	// Validate transaction hash
 	if err := v.ValidateTransactionHash(tx.Hash().Hex()); err != nil {
 		return err
 	}
-	
+
 	// Validate to address if present
 	if tx.To() != nil {
 		if err := v.ValidateCommonAddress(*tx.To()); err != nil {
 			return err
 		}
 	}
-	
+
 	// Validate value
 	if err := v.ValidateBigInt(tx.Value(), "value"); err != nil {
 		return err
 	}
-	
+
 	// Validate gas limit
 	gasLimit := tx.Gas()
 	if gasLimit > 50000000 { // 50M gas limit seems reasonable
 		return &ValidationError{"gasLimit", gasLimit, "gas limit exceeds reasonable bounds"}
 	}
-	
+
 	// Validate gas price
 	if tx.GasPrice() != nil {
 		if err := v.ValidateBigInt(tx.GasPrice(), "gasPrice"); err != nil {
 			return err
 		}
-		
+
 		// Check for reasonable gas price bounds (up to 1000 Gwei)
 		maxGasPrice := big.NewInt(1000000000000) // 1000 Gwei in wei
 		if tx.GasPrice().Cmp(maxGasPrice) > 0 {
 			return &ValidationError{"gasPrice", tx.GasPrice(), "gas price exceeds reasonable bounds"}
 		}
 	}
-	
+
 	// Validate transaction data
 	if err := v.ValidateHexData(common.Bytes2Hex(tx.Data())); err != nil {
 		return err
 	}
-	
+
 	// Check data size limits
 	if len(tx.Data()) > 1024*1024 { // 1MB limit
 		return &ValidationError{"data", len(tx.Data()), "transaction data exceeds size limit"}
 	}
-	
+
 	return nil
 }
 
@@ -193,45 +193,45 @@ func (v *InputValidator) ValidateBlock(block *types.Block) error {
 	if block == nil {
 		return &ValidationError{"block", block, "block cannot be nil"}
 	}
-	
+
 	// Validate block number
 	if err := v.ValidateBlockNumber(block.Number().Uint64()); err != nil {
 		return err
 	}
-	
+
 	// Validate block hash
 	if err := v.ValidateBlockHash(block.Hash().Hex()); err != nil {
 		return err
 	}
-	
+
 	// Validate parent hash
 	if err := v.ValidateBlockHash(block.ParentHash().Hex()); err != nil {
 		return err
 	}
-	
+
 	// Validate coinbase address
 	if err := v.ValidateCommonAddress(block.Coinbase()); err != nil {
 		return err
 	}
-	
+
 	// Validate timestamp
 	timestamp := block.Time()
 	if timestamp == 0 {
 		return &ValidationError{"timestamp", timestamp, "timestamp cannot be zero"}
 	}
-	
+
 	// Check for future timestamps (with 5 minute tolerance)
 	maxTimestamp := uint64(1<<63 - 1) // Max int64
 	if timestamp > maxTimestamp {
 		return &ValidationError{"timestamp", timestamp, "timestamp exceeds maximum value"}
 	}
-	
+
 	// Validate transaction count
 	txCount := len(block.Transactions())
 	if txCount > 10000 { // Reasonable transaction count limit
 		return &ValidationError{"txCount", txCount, "transaction count exceeds reasonable limit"}
 	}
-	
+
 	return nil
 }
 
@@ -240,19 +240,19 @@ func (v *InputValidator) ValidateAmount(amount *big.Int, tokenDecimals uint8, fi
 	if err := v.ValidateBigInt(amount, fieldName); err != nil {
 		return err
 	}
-	
+
 	// Check for dust amounts (too small to be meaningful)
 	minAmount := big.NewInt(1)
 	if amount.Cmp(minAmount) < 0 {
 		return &ValidationError{fieldName, amount, "amount too small (dust)"}
 	}
-	
+
 	// Check for unreasonably large amounts based on token decimals
 	maxTokenAmount := new(big.Int).Exp(big.NewInt(10), big.NewInt(int64(tokenDecimals+9)), nil) // 1B tokens
 	if amount.Cmp(maxTokenAmount) > 0 {
 		return &ValidationError{fieldName, amount, "amount exceeds reasonable token bounds"}
 	}
-	
+
 	return nil
 }
 
@@ -261,11 +261,11 @@ func (v *InputValidator) ValidateSlippageTolerance(slippage float64) error {
 	if slippage < 0 {
 		return &ValidationError{"slippage", slippage, "slippage cannot be negative"}
 	}
-	
+
 	if slippage > 50.0 { // 50% max slippage
 		return &ValidationError{"slippage", slippage, "slippage exceeds maximum allowed (50%)"}
 	}
-	
+
 	return nil
 }
 
@@ -274,14 +274,14 @@ func (v *InputValidator) ValidateDeadline(deadline uint64) error {
 	if deadline == 0 {
 		return &ValidationError{"deadline", deadline, "deadline cannot be zero"}
 	}
-	
+
 	// Check if deadline is in the past (with 1 minute tolerance)
 	// Note: This would need actual timestamp comparison in real implementation
 	maxDeadline := uint64(1<<32 - 1) // Reasonable unix timestamp bound
 	if deadline > maxDeadline {
 		return &ValidationError{"deadline", deadline, "deadline exceeds reasonable bounds"}
 	}
-	
+
 	return nil
 }
 
@@ -290,15 +290,15 @@ func (v *InputValidator) SanitizeString(input string) string {
 	// Remove null bytes and control characters
 	cleaned := strings.ReplaceAll(input, "\x00", "")
 	cleaned = regexp.MustCompile(`[\x00-\x1F\x7F]`).ReplaceAllString(cleaned, "")
-	
+
 	// Trim whitespace
 	cleaned = strings.TrimSpace(cleaned)
-	
+
 	// Limit length
 	if len(cleaned) > 1000 {
 		cleaned = cleaned[:1000]
 	}
-	
+
 	return cleaned
 }
 
@@ -307,23 +307,23 @@ func (v *InputValidator) ValidateEvent(event interface{}) error {
 	if event == nil {
 		return &ValidationError{"event", event, "event cannot be nil"}
 	}
-	
+
 	// Use reflection or type assertion to validate event fields
 	// For now, just validate that it's not nil
 	// In a real implementation, you'd validate specific event fields
-	
+
 	return nil
 }
 
 // ValidateMultiple validates multiple fields and returns all errors
 func (v *InputValidator) ValidateMultiple(validators ...func() error) []error {
 	var errors []error
-	
+
 	for _, validator := range validators {
 		if err := validator(); err != nil {
 			errors = append(errors, err)
 		}
 	}
-	
+
 	return errors
-}
+}