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Merge pull request #5 from Trendyol/circuits-module
add circuit breaker module
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,120 @@ | ||
| package http | ||
|
|
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| import ( | ||
| "fmt" | ||
| "github.com/afex/hystrix-go/hystrix" | ||
| "time" | ||
| ) | ||
|
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| type CircuitFunc func() error | ||
| type CircuitErrorFilter func(error) (bool, error) | ||
|
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| type CircuitConfig struct { | ||
| Name string | ||
| Timeout int | ||
| MaxConcurrentRequests int | ||
| ErrorPercentThreshold int | ||
| RequestVolumeThreshold int | ||
| SleepWindow int | ||
| Commands []string | ||
| } | ||
|
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| type Circuit struct { | ||
| config CircuitConfig | ||
| } | ||
|
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| func NewCircuit(c CircuitConfig) *Circuit { | ||
| hystrixConfig := hystrix.CommandConfig{ | ||
| Timeout: c.Timeout, | ||
| MaxConcurrentRequests: c.MaxConcurrentRequests, | ||
| ErrorPercentThreshold: c.ErrorPercentThreshold, | ||
| RequestVolumeThreshold: c.RequestVolumeThreshold, | ||
| SleepWindow: c.SleepWindow, | ||
| } | ||
|
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| for _, command := range c.Commands { | ||
| hystrix.ConfigureCommand(fmt.Sprintf("%s:%s", c.Name, command), hystrixConfig) | ||
| } | ||
|
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| return &Circuit{ | ||
| config: c, | ||
| } | ||
| } | ||
|
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| func (c *Circuit) Do(command string, fu CircuitFunc, fallback func(error) error, fi ...CircuitErrorFilter) error { | ||
| var e error | ||
| var ok bool | ||
|
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| function := func() error { | ||
|
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| err := fu() | ||
|
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| for _, filter := range fi { | ||
| if ok, e = filter(err); ok { | ||
| return err | ||
| } | ||
| } | ||
|
|
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| if len(fi) > 0 { | ||
| return nil | ||
| } | ||
|
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| return err | ||
| } | ||
|
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| hystrixErr := hystrix.Do(fmt.Sprintf("%s:%s", c.config.Name, command), function, fallback) | ||
|
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| if hystrixErr != nil { | ||
| return hystrixErr | ||
| } | ||
|
|
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| if e != nil { | ||
| return e | ||
| } | ||
|
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| return nil | ||
| } | ||
|
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| func (c *Circuit) DoR(command string, fu CircuitFunc, fallback func(error) error, retry int, delay time.Duration, fi ...CircuitErrorFilter) error { | ||
| var e error | ||
| var ok bool | ||
|
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| filter := func() error { | ||
| err := fu() | ||
|
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| for _, filter := range fi { | ||
| if ok, e = filter(err); ok { | ||
| return err | ||
| } | ||
| } | ||
|
|
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| if len(fi) > 0 { | ||
| return nil | ||
| } | ||
|
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| return err | ||
| } | ||
|
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| function := func() error { | ||
| err := filter() | ||
|
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| for c := 0; c < retry && err != nil; c++ { | ||
| time.Sleep(delay) | ||
| err = filter() | ||
| } | ||
|
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| return err | ||
| } | ||
|
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| hystrixErr := hystrix.Do(fmt.Sprintf("%s:%s", c.config.Name, command), function, fallback) | ||
|
|
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| if hystrixErr != nil { | ||
| return hystrixErr | ||
| } | ||
|
|
||
| if e != nil { | ||
| return e | ||
| } | ||
|
|
||
| return nil | ||
| } |
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