golang框架中熔断的实现机制是什么？

import (
    "time"

    hystrix "github.com/afex/hystrix-go/hystrix"
)

// Command represents a Hystrix command.
type Command struct {
    // Run is the actual call.
    Run func() error
}

// Execute executes the command and handles the circuit breaker.
func (c Command) Execute() error {
    return hystrix.Do("command_name", func() error {
        return c.Run()
    }, &hystrix.CommandConfig{
        Timeout: time.Second,
    })
}

func main() {
    cmd := Command{
        Run: func() error {
            // Make an HTTP call
            return nil
        },
    }

    if err := cmd.Execute(); err != nil {
        // Handle the error
    }
}

import (
    "context"
    "io"

    "github.com/resilience4go/resilience4go/circuitbreaker"
)

// Breaker represents a Resilience4go circuit breaker.
type Breaker struct {
    // Ring is the Resilience4go ring.
    Ring *circuitbreaker.Ring
    // Breaker is the Resilience4go circuit breaker.
    Breaker circuitbreaker.Breaker
}

// Do executes the call and handles the circuit breaker.
func (b *Breaker) Do(ctx context.Context, in io.Reader, out io.Writer) error {
    return b.Breaker.Execute(ctx, func(ctx context.Context) error {
        // Make an HTTP call
        return nil
    })
}

func main() {
    // Create a Resilience4go ring.
    ring := circuitbreaker.NewRingWithConfig(circuitbreaker.RingConfig{
        ErrorThresholdPercentage: 50,
    })

    // Create a Resilience4go circuit breaker.
    breaker := circuitbreaker.New(ring, "breaker_name")

    myBreaker := Breaker{
        Ring:    ring,
        Breaker: breaker,
    }

    if err := myBreaker.Do(context.TODO(), nil, nil); err != nil {
        // Handle the error
    }
}