• 设为首页
  • 点击收藏
  • 手机版
    手机扫一扫访问
    迪恩网络手机版
  • 关注官方公众号
    微信扫一扫关注
    迪恩网络公众号

rubyist/circuitbreaker: Circuit Breakers in Go

原作者: [db:作者] 来自: 网络 收藏 邀请

开源软件名称:

rubyist/circuitbreaker

开源软件地址:

https://github.com/rubyist/circuitbreaker

开源编程语言:

Go 100.0%

开源软件介绍:

circuitbreaker

Circuitbreaker provides an easy way to use the Circuit Breaker pattern in a Go program.

Circuit breakers are typically used when your program makes remote calls. Remote calls can often hang for a while before they time out. If your application makes a lot of these requests, many resources can be tied up waiting for these time outs to occur. A circuit breaker wraps these remote calls and will trip after a defined amount of failures or time outs occur. When a circuit breaker is tripped any future calls will avoid making the remote call and return an error to the caller. In the meantime, the circuit breaker will periodically allow some calls to be tried again and will close the circuit if those are successful.

You can read more about this pattern and how it's used at:

GoDoc

Installation

  go get github.com/rubyist/circuitbreaker

Examples

Here is a quick example of what circuitbreaker provides

// Creates a circuit breaker that will trip if the function fails 10 times
cb := circuit.NewThresholdBreaker(10)

events := cb.Subscribe()
go func() {
  for {
    e := <-events
    // Monitor breaker events like BreakerTripped, BreakerReset, BreakerFail, BreakerReady
  }
}()

cb.Call(func() error {
	// This is where you'll do some remote call
	// If it fails, return an error
}, 0)

Circuitbreaker can also wrap a time out around the remote call.

// Creates a circuit breaker that will trip after 10 failures
// using a time out of 5 seconds
cb := circuit.NewThresholdBreaker(10)

cb.Call(func() error {
  // This is where you'll do some remote call
  // If it fails, return an error
}, time.Second * 5) // This will time out after 5 seconds, which counts as a failure

// Proceed as above

Circuitbreaker can also trip based on the number of consecutive failures.

// Creates a circuit breaker that will trip if 10 consecutive failures occur
cb := circuit.NewConsecutiveBreaker(10)

// Proceed as above

Circuitbreaker can trip based on the error rate.

// Creates a circuit breaker based on the error rate
cb := circuit.NewRateBreaker(0.95, 100) // trip when error rate hits 95%, with at least 100 samples

// Proceed as above

If it doesn't make sense to wrap logic in Call(), breakers can be handled manually.

cb := circuit.NewThresholdBreaker(10)

for {
  if cb.Ready() {
    // Breaker is not tripped, proceed
    err := doSomething()
    if err != nil {
      cb.Fail() // This will trip the breaker once it's failed 10 times
      continue
    }
    cb.Success()
  } else {
    // Breaker is in a tripped state.
  }
}

Circuitbreaker also provides a wrapper around http.Client that will wrap a time out around any request.

// Passing in nil will create a regular http.Client.
// You can also build your own http.Client and pass it in
client := circuit.NewHTTPClient(time.Second * 5, 10, nil)

resp, err := client.Get("http://example.com/resource.json")

See the godoc for more examples.

Bugs, Issues, Feedback

Right here on GitHub: https://github.com/rubyist/circuitbreaker




鲜花

握手

雷人

路过

鸡蛋
该文章已有0人参与评论

请发表评论

全部评论

专题导读
热门推荐
阅读排行榜

扫描微信二维码

查看手机版网站

随时了解更新最新资讯

139-2527-9053

在线客服(服务时间 9:00~18:00)

在线QQ客服
地址:深圳市南山区西丽大学城创智工业园
电邮:jeky_zhao#qq.com
移动电话:139-2527-9053

Powered by 互联科技 X3.4© 2001-2213 极客世界.|Sitemap