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

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

pkg/circuit/breaker.go

@@ -35,14 +35,14 @@ func (s State) String() string {
 
 // Config holds circuit breaker configuration
 type Config struct {
-	Name                string
-	MaxFailures         uint64
-	ResetTimeout        time.Duration
-	MaxRequests         uint64
-	SuccessThreshold    uint64
-	OnStateChange       func(name string, from State, to State)
-	IsFailure           func(error) bool
-	Logger              *logger.Logger
+	Name             string
+	MaxFailures      uint64
+	ResetTimeout     time.Duration
+	MaxRequests      uint64
+	SuccessThreshold uint64
+	OnStateChange    func(name string, from State, to State)
+	IsFailure        func(error) bool
+	Logger           *logger.Logger
 }
 
 // Counts holds the circuit breaker statistics
@@ -56,12 +56,12 @@ type Counts struct {
 
 // CircuitBreaker implements the circuit breaker pattern
 type CircuitBreaker struct {
-	config       *Config
-	mutex        sync.RWMutex
-	state        int32
-	generation   uint64
-	counts       Counts
-	expiry       time.Time
+	config     *Config
+	mutex      sync.RWMutex
+	state      int32
+	generation uint64
+	counts     Counts
+	expiry     time.Time
 }
 
 // NewCircuitBreaker creates a new circuit breaker
@@ -246,7 +246,7 @@ func (cb *CircuitBreaker) setState(state State, now time.Time) {
 	}
 
 	if cb.config.Logger != nil {
-		cb.config.Logger.Info(fmt.Sprintf("Circuit breaker '%s' state changed from %s to %s", 
+		cb.config.Logger.Info(fmt.Sprintf("Circuit breaker '%s' state changed from %s to %s",
 			cb.config.Name, prev.String(), state.String()))
 	}
 }
@@ -278,8 +278,8 @@ func (cb *CircuitBreaker) Reset() {
 
 // Errors
 var (
-	ErrOpenState        = fmt.Errorf("circuit breaker is open")
-	ErrTooManyRequests  = fmt.Errorf("too many requests")
+	ErrOpenState       = fmt.Errorf("circuit breaker is open")
+	ErrTooManyRequests = fmt.Errorf("too many requests")
 )
 
 // TwoStepCircuitBreaker extends CircuitBreaker with two-step recovery
@@ -292,7 +292,7 @@ type TwoStepCircuitBreaker struct {
 func NewTwoStepCircuitBreaker(config *Config) *TwoStepCircuitBreaker {
 	return &TwoStepCircuitBreaker{
 		CircuitBreaker: NewCircuitBreaker(config),
-		failFast:      true,
+		failFast:       true,
 	}
 }
 
@@ -405,4 +405,4 @@ func (m *Manager) Reset() {
 	for _, breaker := range m.breakers {
 		breaker.Reset()
 	}
-}
+}